Radio Communication October 1989

ELECTRONIC COUNTER MEASURES: How moth,a 40a year-old aircraft and the RAF join forces to cause confusion

IMF -----

LEICESTER SHOW PREVIEW KEN WOOD

TS-950S. This is DX-clusive Rumours have abounded for some months that from your operating frequency — even during Kenwood were once again about to take the HF transmitting; such as the revolutionary digital signal transceiver market by the throat, and with the processing option which gives improvements of up to announcement of the TS-950S those predictions have 10 dB in carrier and unwanted sideband suppression; proved to be true. It is an undisputed fact that variable transmit bandwidth; adjustable rise time of Kenwood HF transceivers have always led the way, the CW envelope; and much more. and it seemed almost impossible for their design team The photograph and this brief text can only give a hint to make significant advances on the success of the TS- of what the TS-950S can deliver — the full story can 940S, — but they have. only be told by a visit to your Kenwood approved We don't have to tell you that the receiver performance dealer or a browse through some detailed literature, is outstanding; a noise floor of -140 dBm will do that. but take it from me that once again, Kenwood have Nor do we have to mention the ease of use; Kenwood shown the way forward in HF transceiver design. has an enviable reputation in this area. What we must give a few hints about are some of the new operating John Wilson G3PCY/5N2AAC aids which Kenwood have included, such as a dual receiver which allows you to listen up to 500 kHz away LOWE ELECTRONICS LTD. Chesterfield Road, Matlock, Derbyshire DE4 5LE Telephone 0629 580800 (4 lines) Sole Appointed UK Distributor for KENWOOD Amateur Radio Editor Trevor Preece, G3TRP

Deputy Editor David Bobbett, 041110 News Editor (Acting) Radio Communication John Nelson GW4FRX

Design V OL U M E 65 No 10 O C T O B E R 1989 Linda Penny

Draughtsman Derek Cole CONTENTS

Editorial Assistant Giles Booth

Editorial Secretary Marcia Bnmson 4 SO CIETY AFFAIRS News from HFCC. EMC News, Raynet Zone 2 Result An contributions and correspondence Radio Communication concerning the content of Radio 6 NE WS Communication should be posted to: Flying Dutchmen. 144MHz on Ben Nevis. Ohm's Law?, Lake District The Editor LX MOKit OVNTU YEAStqlerc Rescue, News from Waterloo Bridge House, WARC in 1992, WAB News, RaJlo Communication GB2ATC. New Products, New VHF Records, Sussex Fair. American Lambda House, Cranborne Road Licences, Famous Callsign Re-issued Potters Bar, Hens EN6 3J E

Tel (Editorial): 0707 59015 fia/r 4 +4 14 ELECTR ONIC CO U NTER MEAS URES Fax (Editorial): 0707 46094 How to go jam ming ... and get paid for it Tel (GB2RS late changes): 0707 59260 17 SPECTR U M AN ALYSIS E-mail (Telecom Gold): 76:MSX020 eHF Prestel Page 8107 eHF Propagation Predictions •VHF/UHF Fteports for Spectrum Analysis should ¡FUR," • •SWL be sent to the Band Editors: r eS111, HF John Alfaway. G3FKM, 10 Knightiow 34 TEC H NIC AL TOPICS Road, Birmingham B17 8013 PSU Compromises • Microwave Oven TV • Dual-Voltage and VHF/UHF Main Photo: Canberra Ti? used by RAF 360 Squadron for Electronic Voltage-Multiplier PSUs • HF Packet • Battery Charger Controllers • Norman Frtch.G3FPK. 40 Eskdale Aircraft-Enhanced Propagation Gardens. Purley. Surrey CR2 1EZ Counter Measures — page 14. (Telecom Gold 76:MSX022) Inset: Dutch amateurs and kite experts — page 7. Telex: 9312132268 (SAG) 40 S WIT C HE D MO DE POWER SUPPLIES SWL We demystify the SMPS Bob Treacher, 93 Elibank Road. Ettham, London SE9 10.1 44 BEAN TIN ANTE N N A MICROWAVES Mike Dixon. 63PFR, Woodstock, How to re-cycle rubbish and get a 15m antenna Gazebank. Honey. Warrington, Cheshire WA6 BLL 46 RS GB MAIL OR DER PUBLIC ATIO NS ADVERTISING All display and classified 47 SIMPLE 20m BEA M ANTE N N A advertising enquiries (excepting An effective and inexpensive 3-element 20m beam for beginners and Members' Ads) should be experts alike directed to our advertisement agents Victor Brand Associates Ltd. 49 LEICESTER SHO W PREVIE W 'West Barn', Low Common, eA sneak preview of some of the goodies on show Bunwell, •Pull-out floor plan and fist of exhibitors Norwich, Norfolk NR16 1SY, Tel: 095 389 8473 G1AD W and G4LXM handing a 55 IN PRA CTICE Fax: 095 389 8437 cheque for £927 to Nikki Browne — page 9. Reforming Electrolytics e Safe Operating Area • Mains-borne Noise • Hi -Fi RFI • Get the FT101 on the New Bands • Heatsinks Radio Communication is published by the Radio Society of Great 60 C OL U M NS Britain as its official journal on the •DATACO M MS Getting Started, Future TNC Firmware last Friday of the previous month and is sent free and post paid to all *MICR O WAVES Awards, Eastnet's Experiences members of the Society. •ORP ...goes to Texas •SWL 6th HF Challenge. HAB Awards Closing date for contnbutions. unless eEMC MATTERS Screened Enclosures. Euro Meeting otherwise notified, is five weeks prior to publication date 78 C O NTEST NE WS AND RESULTS Cd,', Radio Society of Great Britain 1989 83 CLU B FILES The first part of our comprehensive list of affiliated clubs and societies, ISSN 0033-7803 from Avon to Hampshire.

95 ME MBERS' ADS Filmset by JJ Typographies Ltd. Collis I louse. Locks Hill, Rochford. 98 HELPLINES Essex ssa IBX 98 DIARIES AN D DATES Printed by Mayhew McCrimmon Printers Ltd. Uni s -4 Star Lane Club News, Mobile Rallies, GB Calls ndustrial Estate Great Wakering. Essex. SS3 OPJ. 100 THE LAST WOR D

102 ADVE RTISERS INDEX

n a7ll r Mi 36,070 copies per Switched Mode Power Supplies ...mepageo. tu 40 Loar Issue average explained — mowi, o. clam ance.s circulation in 1987

RADIO COM MUNICATION October 1989 3 Manual revisions, RSGB COUNCIL representation at the IARU Region II 1989 Conference and the RADIO SOCIETY OF ARRL 75th Anniversary BRIEF celebrations, EMC and DiY-Radio. GREAT BRITAIN 30 March 1989 Council Meeting News from THE NATIONAL SOCIETY WHICH REPRESENTS UK RADIO AMATEURS M1The policy of Council to move Founded 1913. Incorporated 1926. Limited by guarantee. the Society's Annual Meeting to the HF Member society of the International Amateur Radio Union different parts of the UK, to give contest more members an opportunity to PATRON: HRH PRINCE PHILIP, DUKE OF EDINBURGH. KG attend the Annual Meeting, was com mittee discussed at length. Membership is open to all those with an active interest in radio experimentation AFS AND CUMULATIVE A decision on the location of the and communication as a hobby Applications for membership should be made RESU LTS 1989 Meeting would be made at to the secretary. from whom full details of Society services may also be For the members who enquired obtained. the next meeting of Council. about the late publication of these MA new Chairman for the VHF results, the AFS Results appeared Headquarters arid registered office: Contests Committee, Bryn in the September 1989 issue of Lambda House, Cranbome Road, Potters Bar, Herts EN6 3JE Llewellyn, G4DEZ, was appointed RadCom. and the LF Cumulatives Telex 9312 130923 (RSGB) Electronic mail via Dialcom/Telecom Gold: 87:C00083 following the resignation of John appear in this issue. Telephone: 0707 59015. Fax: 0707 45105 Quarmby, G3XDY. Council thanked G3XDY for his great CONTEST LOG AND Secretary and Chief Executive: David Evans, G3OUF contribution to the work of the DECLARATION SHEETS Society, A number of clubs have asked if there is any objection to them aProdcedures were agreed COUNCIL OF THE SOCIETY using photo-copies of the RSGB whereby the Society would be PRESIDENT: J Gannaway, G3YGF contest stationery, as they often represented at Rallies by locally EXECUTIVE VICE-PRESIDENT: FO Hall, Gm8Bzx need extra copies for NFD and based officers of the Society. IMMEDIATE PAST-PRESIDENT: SSS FD etc. The HFCC will Sir Richard Davies. KCVO, CBE. CEng. FIEE, G2XM IMThe Tartan, Scottish and always accept photo-copies HONORARY TREASURER: POSITION VACANT Founders Trophies were discussed. provided they are A4 size. The samples in the RSGB Callbook are ORDINARY MEMBERS OF COUNCIL leouncil discussed the Editor-in- undersized, but as the reduction E J Allaway. MB. ChB, MRCS, LRCP. G3FKM Chiefs letter to Mr Willis, G8VR, applied to both width and length, N G Brinkworth, G3UFB in which he had asked Mr Willis to Mrs M H Claytonsmilh, G4JKS a small amount of enlargement stand down as the contributor of G R Jessop. CEng, MIEE. G6JP during the copy process brings the VHF bands column. Mr Willis A McKenzie. MBE, CEng, FIEE. FAES, G3OSS them up to A4 size. Computer- F S G Rose, G2DRT attended the meeting of Council to derived logs may also be used for G L Benbow, Msc. CEng, MIEE. G3HB put forward his views. After much all RSGB 11F contests, but again discussion, Council thanked Mr they must be formatted to the ZONAL MEMBERS OF COUNCIL Willis for his attendance and standard contest log sheet (40 Zone A G R Smith, BSc, MISTC. MBIM. G4AJJ agieed that in future columnists entries per page) and use the Al Zone B J Allen. G3DOT would be appointed annually by paper size. There is no restriction Zone C J Greenwell, AMIEE. G3AEZ the Editor in association with the on the paper size for the Zone D P E Chadwick. G3RZP Technical and Publications Zone E E J Case. GW4H WR declaration (cover) sheets. There Advisory Committee. Zone F J T Barnes, GI3USS have been enquiries as to why the Zone G F Hall, GM8BZX standard log sheet is not 1111The terms of reference for the formatted to line-printer or daisy- Finance and Staff Committee were HONORARY OFFICERS wheel standards. The format was discussed and clarified. The Audio Visual Library co-ordinator: R G Auckland, G2PA agreed some ten years ago during Committee Chairman, Willie Awards managers. HF: S Emlyn-Jones. GW4BKG. the IARU Region 1 Brighton McClintock, G3VPK, attended the VHF: Ian L Cornes, G4OUT conference and was supposed to be meeting to describe the work of the Chief morse test examiner: A N lanson, G3GDO a standard for all IARU Region 1 HF manager: E J Allaway. G3FKM Committee and to seek closer societies. The line-spacing was Microwave manager: C W Suckling. G3WDG liaison with Council on financial based on a typewriter standard, Trophies manager: Mrs M H Claytonsmilh. G4JKS matters and reporting. VHF manager: K A M Fisher, G3WSN which was thought to be suitable IMAn ad hoc Committee was set up for most uses. This has not proved Correspondence to honorary officers should be to discuss ways of seeking better correct as the introduction of addressed directly to them (OTHR), not to RSGB HO publicity for amateur radio. John electronic, golf-ball and daisy Greenwell was appointed wheel typewriters, together with Chairman. the mass use of word-processors and printers have made the ANNUAL SUBSCRIPTION RATES BA long discussion took place for spacing non-standard and difficult Once-off pining fee: £1.50 to use. To overcome this the HFCC Corporate members: UK and overseas (Radio Communication by plans for Project YEAR and will shortly be producing a revised accelerated surface post): £20.50 Novice Licence frequency UK associate member under 18: £6.95. Family member: £8.20 allocations. log sheet with altered line-spacing UK students over 18 and under 25: £10.45 (Applications should give which should make things easier applicant's age at last renewal date and include evidence of student status) MIOther matters discussed for those who wish to use it on Affiliated club or society/registered group (UK): £20.50 (including Radio included: the half yearly accounts, their printers. There will also be a Communication): £12.30 (excluding Radio Communication) (Subscriptions the co-ordination of external revision of the declaration sheet. include VAT where applicable) events, the opening of a Dollar Further details about the changes Membership application forms available from RSGB HO Account, the RSGB Legacy Fund, and availability of the new sheets the International Beacon Project, will be announced in Radio VHF Contests matters, RAE Communication.

4 RADIO COMMUNICATION October 1989 CLUB CALLS CONTEST service will in the first instance FROM THE SECRETARY A reminder to Club Secretaries only provide a telephone/mailing and Contest Managers that the contact for advice and will not next CCC will be on 11 November. provide for local visits without Now is the time to plan your authority from the EMC entries for this popular event (all Committee Chairman. It is hoped modes including SWL section). that a full list of the EMC organisation will appear in the Fine Tuning the UK Licence next issue of RadCom and the ROPOCO TIMINGS RSGB Call Book with a full Judging by the comments from Last January saw the culmination of two years of work by the competitors, there are mixed description of the services provided. DTI and the RSGB aimed at bringing the UK Amateur Licence feelings about changing the start up to date. Improvements included the addition of CEPT and finish times and it seems the privileges, relaxed identification requirements, permission for majority wish to keep the status Raynet Zone 2 digital repeaters, plus unattended beacon operation, direction quo. The HFCC will decide about finding, low-power remote control, and digital communications. this when reviewing the rules for Election Results In September this year, the US licence went through a similar ROPOCO I. Results of the Raynet Zone 2 change following ARRL and FCC discussions. Some of the election are hereby announced: improvements to the USA licence were based on those which the Mr W F Marshall G410D received RSGB had already obtained in the UK. Of particular importance 28MHz CUMULATIVE 9 votes. was the adoption of the UK Government's view that traffic CONTESTS Mrs P M Smith G4ZWQ received By the time this news is published, generated by, and intended for, licensed radio amateurs is not 30 votes. Third Party in the sense intended by the International Radio the next series of these combined There were 7 spoilt votes. CW and SSB events will be Mrs P M Smith G4ZWQ is Regulations. This should considerably improve the passing of starting. Sessions are on 9, 17, 25 therefore elected as representative packet radio messages between US amateurs and those in the October and 2, 10 November. Rules rest of the World. This is another example of the RSGB's work for Raynet Zone 2. are unchanged from the last set of having a positive influence on amateurs worldwide. sessions earlier in the year and Despite our general satisfaction with all of the benefits of the were published in Contest News Installation of the new UK licence, there remained a number of areas where further for August. negotiation was felt to be necessary. Accordingly, the Society 1990 President recently met with the DTI to argue the case for changes, in some Mr Frank Hall, GM8BZX, will be cases minor but nevertheless important. EMC news installed as the Society's President In brief, the Society's requests were for: The Chairman of the EMC on Saturday 9 December 1989. Committee will announce the The ceremony will take place EMC Co-ordinators Scheme at the after the Society's Annual 1) Clearer numbering of paragraphs HF Convention at Oxford on 1 Meeting. Tickets for the evening 2) Club stations to allow greetings messages from non-licensees October 1989. The organization of dinner are priced £9 per person. 3) Unattended operation to be permitted in various sub-bands in the scheme is to provide local Those applying for tickets will be the 430MHz band contact points for general EMC sent a map of Dunoon, in 4) Clarifying the wording of the sections relating to Unattended advice, with the neccessary Scotland, together with full details Operation support from the Committee, of accommodation if required. 5) Operation by visitors from overseas under supervision Corresponding Members and the Please mark you envelope 6) Updating the Schedule to reflect the full release of 18MHz and EMC Committee members. This 'Presidential Installation.' 24MHz bands 7) Better wording for the period of identification requirements when at a temporary location 8) Maximum carrier power to be 26dBW (400 watts) on CW to align with SSB operation NEWS EDITOR 9) Unattended stations for Amateur Radio Direction Finding to The Radio Society of Great Britain requires a News be permitted on 3.5MHz and 1.8MHz 10) Validation Document to include list of countries with whom Editor for its monthly magazine "Radio Com munica- 3rd party messages can be exchanged tion" and weekly on-air news broadcasts. Familiarity 11) Changes since last renewal to be noted on Validation with the technical hobby of Amateur Radio, plus the Document ability to recognise a good story, follow up leads and 12) Incorporate full details of 28MHz equipment restrictions in write to fit are necessary qualificatior•s. Some expe- Notes rience of working with moden. 'electronic' production and office communications equipment would also be The DTI's response to many of these has been favourable and highly desirable; the RSGB's publications are moving the results of the discussion concerning unattended digital rapidly towards desk-top publishing. communications can be seen in the News pages. The full list of revisions will appear in a future edition of Radio Communication It is a staff position within a small, enthusiastic once the DTI have considered our representations further. In new team, operating from offices in Potters Bar. fact, it now appears that there will be an annual opportunity to Salary is negotiable, according to experience and 'fine tune' the new UK licence. age. Whatever is finally agreed, there will always be further Please apply in writing, enclosing a CV, to the improvements which amateurs would like to see. Nevertheless, it is a most encouraging sign that our licence conditions are Editor, Radio Com munication, Radio Society becoming more liberal at a time when pressure on the radio of Great Britain, Lambda House, Cranborne spectrum from other services has never been greater. This is Road, Potters Bar, Herts. ENO 3JE. Please further confirmation that, as far as the UK Government is mark the envelope "Editorial Vacancy Private concerned, amateur radio has a vital role to play in modern society. and Confidential." David Evans, G3OUF

RADIO COMMUNICATION October 1989 5 AVAILABLE NO W

17 Manual by George Benbow G311B RAE Recognised as the standard text book for the M A N U AL Radio Amateurs' Examination, the twelfth edition has been revised for the 1989-91 syllabus. The book is presented in an easily understandable format taking the candidate step-by-step through the course topics including: Solid-state devices Transmitters Receivers Power supplies A Guide Propagation and antennas to the Transmitter interference Radio Electromagnetic compatibility Amateurs' Measurements Examination Operating practice and procedure In addition to supplying the candidate with the basic requirements for the examination, this book will continue to be a valuable source of reference long after passing the examination.

Geort_e; t1inbo G31 iii

HOW TO PASS I RAE How to pass the RAE by Clive Smith G4FZH and George Benbow G3HB

Companion volume to the RAE Manual, this A practical approach to the book takes a practical approach to the Radio Radio Amateurs' Examination Amateurs' Examination. Chapters explain the nature and correct approach to multiple choice questions and how to prepare for the examination. The majority of the book is given to sample examination papers so that candidates can familiarise themselves with the examination and assess their ability.

Clive Smith C:41.7.1-1 George Renhow G31111 See this month's mail order list for details - pages 45-6

6 RADIO COMMUNICATION October 1989 NEWS Flying Dutchmen REPORTS

A new record for kite-borne eager to tell the world about both. horizontal multiband HF antennas As a contribution to a civic was recently established by promotion which took place in the PI4ARA. This is the callsign of a summer, a local group of kite-flying club station in the Dutch town of experts - 'Roge Vlieger Partners' - Almere, which is located about 12 joined forces with members of the miles east of Amsterdam and - Almere club in an attempt to believe it or not - below sea level! establish a new record for kite- An antenna height of 102 metres borne antennas. The occasion (334') AGL was achieved and would also mark the inauguration of contacts made in the 3.5, 14, 21 and the Almere club's new callsign, 28MHz bands. Our reporter is Erwin PI4ARA. David, G4LQI and ex-PAOCG. A 40-metre (131') long coaxial- The word 'new describes almost fed horizontal multi-band 'FD4' everything in or about Almere. antenna (similar to the I7SVVX Fifty-five years ago the entire area antenna described in the March was part of the Zuider Zee, a 1988 Technical Topics on page 186) brackish tidal area of water was to be lifted to an altitude of 100 covering much of the northern part metres by anything between five of the . After having and seven kites depending on wind ordination was in the hands of put on hold for obvious safety been separated from the open sea speed and connected to a 100W HF Huub. PA3E0U, who had obtained reasons. Alter that, the wind by a dyke, the throughput of river transceiver. This would be operated permission from the National dropped again! In the meantime, water gradually washed out the salt; by Bodhi, PA3EVK, who happens to Aviation Authority to fly kites up to some contacts were being made parts of what is now a lake known be blind and would be sitting in a 200 metres AGL. He also had to from the demonstration station to as the ljsselmeer, which were 'wheelchair taxi' with suitable defend his all-day reservation of the keep the public interested; an HF selected for their agricultural motive power. Bodhi would attempt town hall square against a national antenna was strung between some potential, were surrounded by more to make contacts on 80, 40, 20, 15 political party who wanted to hold suitable lamp-posts. dykes and pumped dry. In this way and 10 metres if conditions an election rally there! Finally, well after noon, the wind an entire new province called permitted. In the Town Hall square Several rehearsals were held, and picked up to a whopping 9 knots. Flevoland was created, and twelve adjacent to the field in which the in the course of one of them a This was well below the design years ago the new town of Almere kites would be flown, a tent 144MHz ground-plane had been value for the kites of 11-15 knots was built. In 1986 local amateurs containing a demonstration station operated at the top of 100 metres of but it seemed worth a try. Three of formed a club, 'Amateur Radio capable of a variety of modes of low-loss H100 cable. Since this is the big kites were rigged in tandem; Almere' which now has 60 operation on HF and VHF would quite heavy, it had helped in commanded by the 'pilot' they rose members. Those who live in Almere enable the public to follow the HF stabilizing the kites and was to 100 metres AGL on 200 metres of are mostly young families who are contacts made by PI4ARA. together therefore used for the HF antenna tether, half of which was then fiercely proud of their achievements with the 'command and control' net as well. The kites used were walked back down. The balun with and lifestyle, and they're always used by the kite crews. Overall co- hexagonal 'Sanjo' models; those coax attached was then hooked on which raised the coax were 7.5 sq m to the tether at the half-way point. (81 sq ft) in area and 5 sq m (54 sq Similar operations were carried out 2 ft) for the 'side kites' holding up with the ends of the antenna and each end of the antenna. A smaller their kites. 'pilot kite' was used to raise the The coax was paid out slowly and 3 stack of 'coax lifters' out of the lee the tethers were manoeuvred to of surrounding buildings. The stabilize the antenna at 50 metres. tether of the main stack consisted PI4ARA was now in business! More of 6mm nylon rope. coax and rope was released in The great day dawned, but stages and the tethers were 3 unfortunately the omens were continuously adjusted to keep the anything but good. When the crew antenna straight and level. arrived on site at 7am there was no However, the height of 100 metres Lill 30kg wind whatsoever. However, there which we wanted for the Guinness o 100m was plenty of rain and fog! Not even Book of Records seemed to be just 9 7 the unweighted pilot kite would stay out of reach in the existing wind COAX H100 airborne. By mid-morning a breeze conditions. It was decided that was beginning to blow but a drastic measures were required.

. thunderstorm was then reported to and an extra kite was run half-way G 6 be nearby; all operations had to be up the main tether (which was now 350 metres long) in order to carry Kite-borne FD4 antenna as designed for some of its weight. That did the winds of 11 — 15 knots. trick; at 6.06 pm the balun was KEY reported to be 102 metres AGL and 1. Main "coax lifter kites 2. Pilot kite 3. Side we had a new record. The excellent kites lifting antenna ends 5. Main tether 6. HF performance, with strong Tether for side kites 7. Aux, lines to keep 9 / Pull 1500 kg antenna level 8. Nylon antenna extensions 3-5MHz signals all over Holland and 9. Ground anchors. Belgium and some super DX on the A FD4 multiband HF Antenna B. Balun C. higher bands (including a KH6 on Coax D. Flag at 50m point E. Coax extension 28MHz in mediocre conditions) to transceiver F. ATU G. SWR meter H. seemed to be almost an anti-climax! 100W transceiver I. Car Battery

RADIO COMMUNICATION October 1989 7 NEWS REPORTS Active mountaineer and keen staying at our 'base camp' in the amateur John Linford, G3WGV and valley below! However, we were Radcom Postal his friend and colleague Tony 144MHz soon getting calls from further Gledhill. G6MCI - both of Reading afield, helped by the (hitherto Survey & District Amateur Radio Club - unknown to us) low-power contest Please help us to conduct a came on the air from the top of Ben going on. I think we gave a few survey into the delivery of Radio. from Communication! We have Nevis on 5/6 August 1989. John stations a rather nice bit of DX from sent in a short piece about their an unusual square. The going was received a number of exploits, which makes interesting fairly slow, though, and we felt Complaints that Rad Corn has reading for those of us whose idea Ben Nevis decidedly out of things compared been unnecessarily delayed in of a DXpedition is taking a with operating in the Reading area. the postal system, and we are handheld with them on a walk to too late even to think about By 0100 we had run out of people to endeavouring to find out just the local... including it in GB2RS news! The talk to, having worked about 20 how long it takes for you to Ben Nevis, Britain's highest drive to Fort William, the nearest stations down as far as Lancashire receive your copy. Once we mountain, was on the air over the town, took some nine hours and we and Northern Ireland. So we have this information, we can weekend of the 5th and 6th of pondered the fact that it would only decided to get some sleep and see then go to the post office with August. The Ben, at I076LS, is on take the radio signals about 2ms to what the morning had to offer. But hard evidence to back our the west coast of Scotland near the make the return trip to 1091-land - almost as soon as we had settled suspicions. town of Fort William; it is if indeed we would be heard at all. down, the rain started! There was To help us to gather this surrounded by mountains of similar A morning was spent arguing about torrential rain all night but the tent information, please would you stature, so the radio potential was who would carry what and testing did its job and we remained nice write on the address label, the unknown and suspected to be the set-up before setting off into the and dry. Believe it or not, we were day and date which you received rather poor. The "Roof of Britain" blue (well, murky-grey) yonder. woken by noises suggesting the the October issue of Rad Com. station was manned by G3WGV and The route up Ben Nevis was distinct prospect of some Please mark your envelope G6MCI, in what is believed to be the straightforward enough. There used competition. Some other mad "RADCOM POSTAL SURVEY", first time a full-scale 144MHz to be an observatory at the top, and amateur had come up to the summit station has operated from the a good path has been made from (at 8am, no less) and was tuning take handhelds up the Ben but it is summit. the nearest access road to the around with a 50MHz handheld. I generally considered too much of The basic idea was conceived summit. However. it still took about was so surprised that I didn't even an undertaking to carry a full after drinking too much of the local five hours to cover the five miles to get his callsign; 1 suppose it must station to the top. In this respect, it brew one evening. The task would the top. You should have seen the have been a bit of a shock for him must be admitted that both of us be to get 25W of SSB/CW with a looks and heard some of the too. felt after the event that we were reasonable antenna, sufficient questions we got from others on the The morning brought much probably carrying just about the battery power and the necessary way up! Once on the top, the next better conditions than those of the maximum weight that either of us survival equipment to the top of the problem to overcome was how to previous day. We could now hear could safely manage - and that only Ben, using the combined carrying pitch our tent - given that there is GB3VHF at Wrotham at a steady S2, because we are active capacity of two people. In the end not a scrap of grass anywhere so all we needed was some activity mountaineers as well as radio this necessitated both of us above the 2000' contour. Ben Nevis - and that's precisely what we got. amateurs. carrying loads of about 60Ib each. was volcanic and the summit is There was a steady stream of calls It should perhaps be stressed that The equipment line-up included an covered in rocks of all shapes and from as far south as Northampton it is not a trivial undertaking to FT290 and 25W Microwave Modules sizes - but no grass. A slightly less and Birmingham, and in the course climb mountains carrying such amplifier, a 9-element portable lumpy section about 50' away from of an interesting few hours we loads - nor to ensure survival in Tonna with UR67 feeder and a 20' the trig point on the summit plateau managed to work G, GW, GI and potentially wild and dangerous telescopic mast. The heaviest item was chosen, and by dint of pieces GD as well as a large number of mountain conditions. Experience is of all was the battery, which for 12V of string and pieces of rock the tent GMs. We even got a mention at the definitely needed in general at 24Ah weighed-in at 181b. In was persuaded to stand up. end of one of the GB2RS mountaineering and backpacking addition, a 'Force 10' tent and full Fortunately it wasn't too windy broadcasts, which resulted in quite before considering an expedition camping and survival gear since otherwise we would have a pile-up for a while. Sadly, the lack such as ours. At least as much including some 15Ib of water were emulated GB2CAN/AM and taken of other publicity probably meant planning effort went into these carried up the 4406' mountain. off! After that, putting up the 9- that we didn't get calls from the far aspects as into matters relating to Prior to the event - which was element Tonna was very simple and south, where we would have been radio. It would be rather organised literally at the last we were soon on the air calling "CO rather weak and missed by most. embarrassing (to say the very least) moment - some attempt was made from Britain's highest radio station". But we did hear some Frenchmen - to become a mountain rescue to publicise the expedition by Operations began at 1745 on the too weak to work but undeniably statistic whilst playing radio from sending a message over the packet Saturday. with a real DX OSO with there. some windswept hill-top. network to 'ALL' in the UK. We were GM7CMC/P, who turned out to be We were expecting battery power A special QSL card has been to be the limiting factor but this produced and sent to all those we proved not to be the case. By 1500 contacted. Now all that remains is I076LS 6,r1,3 av /13 NN17 we had to start dismantling the to work out what to do for an station in preparation for the long encore! The Ben Nevis Expedition haul back down the hill. but the battery was still going strong. We GB400LIZ — QSL Ben Nevis is Britain's To could have run more power after all! highest mountain at 4406' ASL Confirming our OSO The descent was somewhat quicker and is situated close to the Cards but no less exhausting with the town of Fort William in the On 144 MHz SSB Due to an administrative Western Highlands. The heavy loads. We got down in time problem some QSL cards for only access is by a path Al Z 5r6 Aug 119 for a necessary shower, followed by built to service a now the operation of GB400LIZ In Report some much-needed refreshments at derelict observatory dating July 1988 were returned by the the Nevis Bank Hotel. from Vicorian time:. The Bon TRX FT290 4,1›.1 iiriet bureau as invalid. Anyone carries snow at year round. In all, we worked about 100 Pwr 25 W requiring cards for this stations; we would have worked operation is asked to apply 73 de Aerial 9 ele Tonna e 20' many more if we had made any Operated by Members of directly to Mr LE Wilkes G3KJK attempt at publicity beforehand. directly, enclosing a stamped Reading & District Amateur Radio Club The location was clearly unusual. addressed envelope. Special QSL card produced for the Expedition since it appears that many people

8 RADIO COMMUNICATION October 1989 EWS :._«TI l izEpoias News from All foxed up Waterloo Bridge A silly article by a normally sensible journalist appeared in the 19 House August edition of New Scientist. With the sensational headline At a meeting on 17 August. the 'Radio hams eavesdrop unchecked Society and the DTI discussed the on cell phones' (wish we could Novice Licence; the Department write headlines like that and get appear to be enthusiastic to away with it) the piece said progress matters. Initial discussions '...Cellnet, controlled by British centred around the licence Telecom. and Vodafone, owned by document. The Society is Racal, started offering a cell phone producing a first draft, which it will service in January 1985 on the have sent to the DTI by the time this 900MHz waveband. Licensed radio is read. We are also undertaking enthusiasts or -hams" soon found work on the Novice Licence course that they could easily listen in... and examinations. Hams know that the Wireless Following representations from Telegraphy Acts carry heavy fines the Society, a number of and jail sentences for misuse of the improvements are likely to be made airwaves'. And so on and so forth. to the amateur licence with effect Written by Barry Fox. a freelance from 1 January 1990. These will whose work we normally have a lot include the availability of 1299- of time for - he's the scourge of 1300MHz for unattended digital £927 raised by Wimbledon club in some of the dafter claims of the hi-fi communications. Also of interest to and satellite TV fraternity - this was packet enthusiasts will be the appeal a very good example of sloppy non- addition of two frequencies at journalism. 70MHz and also 432.675MHz to On 23 April - which was of course St George's Day - Wimbledon & District Memo to Mr Fox. Most of those those available under the mailbox Amateur Radio Society ran a special-event station, GBOSGH, at St George's using scanning receivers to listen to Notice of Variation system Hospital, Tooting, in aid of the NMR Scanner Appeal. The station raised £927 various interesting things aren't administered by the Society on in sponsorship, which was presented to St George's Hospital Medical School 'licensed radio enthusiasts'. The behalf of the DTI. This should have at the Club's Annual Summer Camp in Chessington. proportion of 'licensed radio the effect of lessening the The photograph shows (L to R) David Whiteman, G1 ADW, W&DARS enthusiasts' who have receivers processing limes for applications Chairman; Nikki Browne, the Bursar of St George's Hospital Medical School; capable of listening to cellular for mailbox ports on these bands, and Jim Todd, G4XLM, the W&DARS Treasurer. radiotelephones is probably a tiny and will also help reduce fraction of one per cent. The usual congestion on 144.65MHz. word for a 'licensed radio enthusiast' is a 'radio amateur': the average British amateur uses the word 'ham' for something he eats in WARC in 1992 a sandwich. I don't have sales figures handy but there must be A recent ITU Plenipotentiary hundreds of scanning receivers Conference has scheduled a full sold every year in the UK. The vast World Administrative Radio majority are bought by people who Conference for the first quarter of like to listen to anything they can 1992. The last full WARC took place find, and you don't need a licence in 1979 and led to the allocation of to own one. Oh. and as a matter of 10. 18 and 24MHz to the amateur fact there are very few scanners on service, amongst other things. A full the UK market which will receive agenda hasn't yet been set. but the what you quaintly refer to as the American Radio Relay League '900MHz waveband'. The MHz is a (ARRL) thinks that some clues to unit of frequency, not wavelength: what's on the cards are contained in perhaps you should have called it the conclusions of recent WARCs the '33 centimetre waveband'. dealing with the HF broadcast Memo to all journalists. Next bands and others. The HF WARC in You never know where you'll meet one time you feel like writing a story like 1987 and the Mobile WARC in the this, why not pick up the phone and same year referred to the possibility Neil, G8XYN and Roy, G4XYN, were recently travelling from the Soviet Dar check your facts beforehand? That of extending the amount of HF East city of Khabarovsk to the Siberian city of Irkutsk, near Lake Baikal. The way you don't risk blowing your spectrum allocated exclusively to 2,200-mile journey on what is often (and inaccurately) known as the Trans- credibility and alienating 50.000- the broadcasting service and Siberian Railway took two and a hall days, and the carriage attendant for the odd radio amateurs at once. We're revising allocations between 1 and journey turned out to be Michel, UZ3TZ. Michel comes from the city of Gorky on 0707 59015. 3GHz for mobile and space use. and is a keen member of the UZ3TYA club contest station. His normal work- ARRL seems to be taking the view load is two weeks on, two weeks off, but he said that he was working solidly (Editorial note . at this stage that the amateur throughout the summer so that he could have the autumn free for the Russian Upon contacting Mr Fox and spectrum in most jeopardy are the contest season! amidst a certain amount of portions between 3 and 30MHz, The Trans-Siberian rail journey takes seven days to travel between Moscow embarrassment, we were told 500MHz and 3GHz and everything and Vladivostok. Michel made a request to the railway authorities to be that the errors were due to above 12.7GHz. allowed to set up an amateur radio station on the train; unfortunately this was heavy sub-editing. Obviously the RSGB will be not forthcoming, although he said that permission would be given for a special — a complimentary copy of working hard on preparations for occasion. Neil and Roy were the first radio amateurs Michel has met on his RadCom goes to Mr Fox for the WARC 92 and we'll keep you posted train - they hope to be able to make contact with him later in the year when he quote of the month!) in these pages. returns to Gorky.

RADIO COMMUNICATION October 1989 9 NEWS R ITOR 1 were joined by another; in fact, both only carry the stretcher for a few Amateur radio helps in rescue Keswick and Cockermouth teams minutes before changing with other were involved since the incident members of the team - hence the Elsewhere in this issue you'll find a apparent that he had broken his was on the borders of both their reason for the large number of little item about how two intrepid arm and would need rescuing from areas. A doctor in the team checked them. When the slope became steep gentlemen operated from the top of the hillside. the details with myself before enough, however, the stretcher was Ben Nevis. We stay in the hills for One of the staff was the author, setting off up the hillside on the slid down on its runners like a another piece, which was sent in by who had borrowed an FT202R rescue mission with his fifteen sledge. Soon everyone arrived at Michael Marsh. G4GGC: hope handheld to take on the trip with colleagues. The need for such a the topmost point of Honister Pass, you're sitting comfortably... him for just such an occasion - large number was to become where the Mountain Rescue The day started normally enough, plus, of course, the ability to chat to apparent later. By the tirry. I had got ambulance was waiting to take the although it must be said that the local amateurs in the area. I back to the scene of the injury, patient to Keswick hospital. weather was fine, hot and sunny, climbed back to the top of Dale three of the advance party of From Keswick, the lad was which is perhaps not so normal for Head (since a valley in the Lake rescuers had already arrived and transferred to the Cumberland the Lake District! A group of six District is not particularly were comforting him and dressing Infirmary at . X-rays showed schoolchildren all aged 15 or 16 conducive to getting out very far some of his wounds. A few minutes that only the radius was fractured, from Sudbury in Suffolk set off from with a QRP handheld) until the later the rest arrived with the doctor although in a difficult direction, and Little Town, near Keswick. with two town of Keswick appeared in the and the rescue stretcher, on to there was some dislocation of the members of staff for a day's fell- distance and then started calling which the patient was strapped. The wrist. By midnight the bones had walking in the Derwent Fells area. A 'CO Emergency' on S20. doctor suspected a fracture of both been reset and plaster applied; he similar group from the same party Unfortunately no-one came back: the radius and the ulna and gave stayed in hospital for a further two had started from Buttermere. and presumably every amateur in the the boy a shot of morphine to ease days before being taken home to they were all planning to meet at area was out enjoying the lovely the pain; it also did something to Suffolk. He is continuing to make Dale Head Tarn for lunch. weather. Eventually, having got allay the discomfort of the rather progress. By early afternoon both groups right back to the top of the hill, my bumpy trip which was about to Sincere thanks are offered to the had achieved the summit of Dale calls were answered by a weak start. Keswick and Cockermouth Head at 2473' ASL and were making signal from G6VGH/M. Ivan had left By now it was about 90 minutes Mountain Rescue Teams for their their way down to the tarn. The his camera in the car and had gone since the accident had occurred. swift and efficient action in the temperature was high and everyone back to fetch it, only to discover Shouldering the stretcher's carrying rescue, and also to G6VGH for his was hot and sticky, looking forward that he had left his rig switched on. straps, the party moved off down help, both with communications lo a dip in the cooling waters of the As he leant over it to switch it off, the mountain. In the heat of the and in finding the team in the tarn below. The ground was stony he heard my call for help. day, even the best porters would first place. and steep and a couple of the girls Map references and details were had already slipped and sat down passed to G6VGH, who fortunately rather more firmly than anticipated. had a radiotelephone in his car; Suddenly one of the boys - perhaps unfortunately it wouldn't work in moving a little too fast - also the narrow confines of the valley slipped and fell awkwardly, where he was located! Instead, Ivan knocking his arm, shoulder and set out to find a telephone with head on some rocks. As soon as which to summon help. Since both help arrived at his side it was quite of us were running low power, communication between us was difficult as Ivan drove from his location near Buttermere up Ohm's Law through the Honister Pass with steep overhanging cliffs on either repealed? side. To me on top of the hill awaiting developments, time No, you haven't picked up the seemed to be standing still. It must April edition by mistake, but you have been even worse for the won't believe the following injured lad and the group with him. story. As of 0001 UTC on 1 who - being well down the January 1990, the values of the mountain from where I was - were standard volt and standard ohm out of contact with what was going will change. The USA's National on. In the event Ivan came across Bureau of Standards is altering some members of a Mountain the value of the standard volt by Rescue Team working at Central Lanes at Leyland a whopping 9.2 parts per Gatesgarth before he found a million, whereas the standard telephone, and they quickly swung 3 June was a day to remember in the history of Central Lancs Amateur Radio ohm will change by a mere 1.7 into action. The Team leader was Society. It was the day of the Leyland Festival - one of the largest annual parts per million. able to confirm details with myself festivals in the UK. 1989 was also its centenary, and CLARS was requested at Apparently there are two directly by radio, thanks to the short notice to run a special-event station. Although this coincided with the reasons why the NBS is making lifting of restrictions in the licence Club's NFD, it was decided that both events could be managed - and the the changes. Believe it or not, which now permit such an Festival turned out to be very successful. there are actually four standard interchange to take place. The RSGB allocated GBOLCF and John, GOJSM; Berni, GOEHW; Shaun, values for the ohm and the volt Incidentally, the Team was quite G7AFH and Jeff, G7BWD handled all the organisation. Two HF stations and a currently (ouch) being used in impressed with the communications VHF station were put on the air, the main antenna was carried on a 100' tower the world; after the adjustment which were made possible by kindly loaned to the Club by the North West Water Authority. More than 300 in January. however, there will amateur radio, despite the contacts were made with over 30 countries. One of the more interesting ones be only one. The other reason is simplicity and low power of the was with an amateur in Kenya whose home 0TH was no more than a mile and a that the last time the values equipment being used at both ends half from the site of the special-event station. The Club also arranged to make were adjusted - in 1972 - of the contact. contact with Leyland's twin town in Germany. This allowed the Mayor of South someone blundered and got As the Mountain Rescue Team Ribble, Councillor George Woods, to exchange greetings with the Burgomeister them wrong! assembled at Honister Hause of Schleswig-Flensburg, Kriespresident Andreas Franzen. The German We kid you not. Hostel at the top of the Pass, they operator at the other end of this contact was Johannes Hassler, DK4LU.

10 RADIO COMMUNICATION October 1989 NEWS REpowrs stations operating outside the UK Sidebands on 50MHz. First of all, he gained the Overseas Introductory Award for •GB3MB, one of the working 25 areas and 10 counties. Manchester VHF repeaters, will Then he look the Basic WAB Award be running low power until early for working 50 areas, followed by 1990 owing to duplexer the WAB Bronze Award for working problems. MB is on channel RO. 100 areas. He is also the first non- Further info from G8NSS_ UK station to gain the Counties • Two repeaters are back on the Award for working 55 counties on air - GB2SA in Swansea on R3 50MHz, together with the first and GB3NX in North Sussex on Overseas Bookholders award for RB2. working 100 of them. In recognition • We hear that 50MHz permits of this outstanding achievement, are likely to be issued in ZS6XJ has also been awarded a Belgium and Luxembourg - Certificate of Merit. watch this space. Also, Band I Since conditions on 50MHz this television is shortly to bow out autumn and winter are expected to in Spain. be even better, WAB hopes that all • A few tickets for the joint British stations will give their WAB RSGB/Royal Meterological area when working the DX and also Society meeting on 20 October put it on their QSL cards. Amateur Radio Club manned the were still available at presstime This would seem to be a good GB2ATC at RAF special-event station GB2ATC, mainly - get yours from The Secretary point to mention this year's Cardington - on 7MHz. A number of those with at HQ. but first come, first remaining contests, which include a whom contact was made had spent served. 50MHz event. Contest rules and log caption to pic part of their RAF life on the base. In • The 1990 Call Book should sheets are available from the WAB addition 50 and 144MHz were used, appear in time for the 1990 Contest Manager, who is Ian Webb, with demonstrations of packet and Convention on 21/22 April 1990. G6TNW. His address is The station at Car- satellite communication via contacts •The new QSL manager for the Cornerways, Orchard Road, St dington, near Bedford, is famous for with the USA and Japan. Club G4AAA to AU and G4HAA to Neots, Huntingdon, Cambs PE19 the large airship hangars which still members were kept busy explaining HZZ series is Mr R Morshead 3AN. Please send an SASE (9" 4") dominate the local skyline. Cardington amateur radio to a steady stream of (GOAEQ), 4 Osmans Close, and three first-class stamps if you is known to countless RAF personnel members of the public. Amongst Bracknell, Berks, RG12 6PX. require log sheets. Remaining who passed through its gates in the these the Club was delighted to • New QSL bureau sub- contests are 50MHz Phone on 8 1940s and 1950s, and on Saturday 15 discover some ex-WT Ops and Sig- manager for GOMAA-GOMZZ is October between 0900 and 1200 July it was the venue for an 'Air Rally' nallers whose interest was immediately Mr R Veale, G4LEA; his address GMT, LF CW on 5 November from to mark the fiftieth anniversary of 134 re-kindled at the sight of a key! is 6 Grantson Close. Brislington, 1400 to 1800 GMT and the HF Squadron which The Club wishes to apologise to Bristol BS4 4NA. Mixed Mode on 12/13 November is based at Bedford. those who could not be pulled out of • RSGB expects to introduce 1200 to 1200 GMT. Note that UK To commemorate the anniversary, the pile-up and to thank those with direct debit facilities for stations may operate for a the rarely-used grass airfield was whom their members had a few members' subs early next year. maximum period of 9 hours. made available and more than 100 moments of nostalgia. They would If everyone paid by this method, Other WAB firsts this month are light aircraft flew in from all over the like to remind readers that the Bedford we'd save about £5000 a year. SWL Roger Sheppard. who received UK. Over 10,000 visitors were treated club will be on the air from RAF • Don't forget the 'EMC Hotline* the 90 and 100 Overseas to a flying display which included a Cardington again on 3 September on 0329 239644 if you need fast Bookholders heard; GOGQR, who pass by the 'Red Arrows' a display by with the callsign GB2WW to mark the advice with EMC problems. has worked 10 Overseas the RAF Memorial Flight with their 50th anniversary of the outbreak of Bookholders on 3.5MHz: and Lancaster, Spitfire and Hurricane, a the Second World War; they'll also be G1NRM, who has claimed the first Gloster Gladiator and a parachute on again from the same site on 14/15 Bookholders Award for 430MHz descent by members of the Metro- October with the callsign GB0101 to Cheaper South having worked 100. He was also the politan Police Parachute Team. commemorate the launch of the ill- first to work 100 3rd-series Members of Bedford & District fated R101 airship sixty years ago. Atlantic awards bookholders on 50MHz. Information about WAB matters Last month we mentioned three may be obtained from Brian Morris. new awards - the South Atlantic, BEDFORD G4KSO at 22 Burdell Avenue, ostl the Ascension Island and the Air Sandhills Estate. Headington, Bridge - and quoted some costs. RADIO CLUB Oxford OX3 8ED. Incidentally, the We hear that the administrators of new and fully-revised Fourth Series these awards have revised the WAB Book is now available from charges slightly: applications for G4KSQ at a cost of £7 including each award must now be postage and packing. accompanied by 10 IRCs. USS5 or £2.50. The address is still Awards Manager, PO Box 2, Ascension Correction Island, South Atlantic. On page 16 of September's Bad Corn we gave details of the modular kits available from WAB news Jandek. Unfortunately, a couple 4'ti( of bugs crept in, and G3ZOM To coin a cliche. ZS6XJ has really has asked us to point out that swept the board on 50MHz. Jandek's correct telephone Conditions to South Africa were number is 0384 288900. Also, if very good last winter and ZS6XJ you're writing for details, please has won several WAB awards at enclose an SAE. once - all of which are firsts for

RADIO COMMUNICATION October 1989 11 NEWS REPORTS OdB wrt noise floor) and 0.5eV for Operating an S9 signal. muTek are at PO Box 24, Long overseas? Eaton, Nottingham NG10 4N0. New legislation introduced by the HAS Electronics sent us a colour MODEL BOO CAPACITANCE BOX Government of Greece now allows brochure and spec of the new Ten- visiting radio amateurs from EEC Tec Omni V HF transceiver, which looks exceedingly posh. They said countries to operate portable and mobile stations for up to three that "in the interests of first-class months. No further formalities are receive performance, Ten-Tec has required for holders of licences combined the advantages of the issued in line with CEPT crystal mixed oscillator with the convenience of all the digital Recommendation T/Fi 61-01. The permitted transmitter power is not features, the result is a transceiver which is amateur bands only with greater than the limits specified for SCREEN superior phase-noise performance, Greek amateurs and only frequencies allocated to the dual VF0s, 25 memories, fast and slow tuning and many more amateur service in Greece can be features." used. The callsign to use is of the More info from Fred Rendell at form SV/own call/M or SV/own call/ HAS Electronics on 021-789 7575, P. (Tnx G3FNJ - more info from or fax them your order for one on MSD if you need it). performance three-pole 021-789 8040. New Zealand has recently New products Tchebyshev bandpass filter Something we haven't seen for introduced new regulations provides image rejection and feeds years is a 'resistance box'. Maplin allowing visiting UK licensees to Want a new front-end for your the mixer via a resistive pad. have now got one available, and operate on bands above 144MHz IC202? Well, muTek is now Considerable care has been taken very nice it looks too - wish they'd using handheld equipment only producing the RPCB202ub. which to ensure that the mixer sent us one to play with. It'll without the need for prior is a complete replacement front- terminations are adequate, since produce any resistance you like permission. Again. MSD has full end for any of the '202 series. The failure to do this will result in a between 111 and 999.999f) in lj details. press release says that it"...has a considerable degradation of steps: you select it by pressing Finally, a reminder that the DTI signal path designed for minimum potential mixer performance. A high push-buttons and the value is has asked UK amateurs not to noise and high dynamic range. A dynamic range MOSFET amplifier displayed on the decade switches in operate in Turkey under the terms low-loss nitrogen-filled relay with negative feedback follows this ohms. In the Maplin one they've of the CEPT agreement for the time replaces the diode antenna mixer and is also matched for low added the clever touch of providing being. More news soon. switching system used by the noise. The output from this stage an additional lkil resistor between manufacturer. This is followed by a drives the original crystal filter and one of the terminals of the resistor very-low-noise RF amplifier using a noise-blanking circuitry'. network and a third stand-alone modern silicon dual-gate MOSFET. Sounds just the job for owners of terminal. This means that the box Straight Key Day The noise figure of this device is of the IC202. which is still admired for can be used as a very accurate the order of 0.6dB. However, since one of the cleanest transmitted potential divider. 1989 this order of sensitivity is signals on 144MHz (other Get yours from Maplin for £79.95 unnecessary for terrestrial manufacturers please copy). muTek - stock number is JL63T. The third RSGB Straight Key Day communications where the limiting quotes the following spec: noise There's also a five-decade will take place on Saturday 14 factor is external noise, the design figure 1dB, image rejection 70dB, capacitance box, which will do October 1989. Because of the poor trades some of the noise figure for intermod-free dynamic range better 100pF to 9.9999µF in 100pF steps - conditions on 3.5MHz last year and extra dynamic range. Following the than 90dB (one tone of two to this one costs £89.95 and the stock the need to ensure communication RF amplifier, a very high- generate a third-order product at number is YT55K. between participants from both north and south of the UK, it has been decided to use the 7MHz band for this years' event. Operation between 7010 and 7030kHz is suggested. with QRP stations staying close to the higher frequency. Start and finish times are 0900 to 2000 GMT, which should give enough time for propagation to be useful to all areas of the UK. Remember that this is not a contest - the only requirement is to be active with a straight key and to demonstrate your skills. Information giving the other participants some details of the key you're using should be passed. Once again. the HF Committee will be interested in seeing any pictures 20th anniversary celebrations. It shows the Mayor accom- of the keys used, and would also Mayor visits club panied by TCARS chairman John Ward, G8YOK, listening like to have nominations for 'Best to the HF station operated by Roy Ellison, G4WYF. Fist'. Please send comments and This photo (taken by Ray Knighton, GOGER) was taken Also seen listening (I to r) a re Ricky Johnson, G4X NM; the pics to G3VTT QTHR. A small prize when the Mayor and Mayoress of Wyre, Councillor & Mrs Mayoress; Harry Shepard, with Mayors daughter In front; will be awarded to the owner of the R C Williamson, and some members of their family visited Arthur Pilling, GODCM; the Mayor's son; and Ian Cobbe, 'Best Fist'. Thornton Cleveleys Amateur Radio Society during its G3ZRZ.

12 RADIO COMMUNICATION October 1989 NEWS m um;

a very well-known local amateur classes - for a USA novice licence apologise to those who made the New VHF records who sadly passed away earlier this you need a whopping 4 wpm! only complaints of the day, which We gather from the excellent year; he was always keen to assist Further information is available were concerned with the catering West/ink newsletter that four new new clubs and amateurs in the area from Robert Wright. G4XDD/NV3Y, arrangements. The Committee world VHF/UHF DX records were and was prominent in RTTY and on 01-221 4399 during the evenings. mentions that the catering established last July. Between the computing circles. It was one of his concession is granted by the 13th and the 15th of July, Paul Lieb, last wishes that the local radio club Sussex Fair managers of Brighton Racecourse KH6HME on Mauna Loa Volcano in should take over his old callsign, to Messrs Letheby & Christopher as Hawaii and Jack Henry, XE2GX0 in and the Appledore Club is very The Sussex Amateur Radio & sole on-site concessionaires; Baja established new records for honoured to keep G2FKO on the Computer Fair took place on 16 outside caterers are not permitted 144, 220 and 430MHz and 2.3GHz. air. July at Brighton Racecourse. Talk- and the caterers make no donation The new 144MHz record of 2,659 in via GB2SMR started at 0800, and or other payments to the Rally miles was set on 13 July at 1046 by 148 mobile stations requested Committee. Discussions will be Paul at Mauna Loa and Jack at Want an directions during the day: almost taking place to try and ensure that Rosario. about 640 miles south of 2000 people attended overall. complaints do not arise at future San Diego. Reports of 5 and 2 were American ticket? The Rally Committee wishes to rallies. exchanged on SSB. KH6HME was There will be a testing session for running 80W to a pair of 7-element the issue of American amateur stacked Vagis and XE2GXQ ran radio licences (should that read 160W to a single 18-element 'licenses?') in London on 25 Quality Cushcraft 'Boomer'. October. Examinations will be The 430MHz record was offered for all classes of licence. established on the following day at from Novice to Amateur Extra MORSE KEYS 1547, with a distance of 2.573 miles Class, and you don't have to be from between the two operators. On the American; anyone can apply. A R.A. KENT ENGINEERS same day at 1754 the 2.3GHz record Stateside callsign would certainly was broken by a contact between be useful if you visit the USA often The LEADING British manufacturer of top quality the two stations at the same - it'd save having to renew your Morse Keys - renowned throughout the world for distance. The Hawaiian station ran reciprocal licence every time you their outstanding performance and reliability. 10W to four vertically stacked loop go - and would also give you Vagis. The 220MHz record was access to reciprocal privileges established at 0755 on 15 July. which aren't currently available to Congratulations to all involved. SOLID BRASS MORSE KEY UK licence-holders, such as the The Kent hand key is used world ability to operate in Japan. The test wide by prolessiOnal and costs $4.75 or the sterling amateur operators alike The Famous callsign silver contacts are mounted in equivalent, and examination precision fine pitch threaded reissued preparation material is available screws titled with positive from the Membership Services locking nuts which are instrument knurled 101 ease of As of 1 August 1989, the Appledore Department at RSGB Headquarters. precise adiustment & District Amateur Radio Club's The written tests are multiple- Our shielded ball race bearing pivots are renowned for then superiority Over all keys using plain callsign became G2FKO, latterly the choice and you'll need to know and bush type bearings. The key is available tri kit torro or ready assembled. The kit lakes tess than an hour RI complete. callsign of Mr Tom Ward. Tom was some CW for all American licence resulting in a key of unrivalled professional standard f38.00 ¡assembled) (31.00 tin kit form) Plus £250 Post and packing

TWIN PADDLE MORSE KEY Our twin paddle ruffle key has been designed and precision engineered to the highest standard Shielded ball race bearings together with tine pitch screw threadSand instrument knurled heads allow precise and individual adjustment of contacts and springs Available ready to use or as a kit taking about an hour to assemble. £47.90 (assembled) £39.50 (in kit lOrM) Pius £2 50 post and packing

SINGLE PADDLE MORSE KEY Because most Operators preter to select their own contact gap and spring settings lis not possible to have a salislactory optimum setting for all With this in mind. we have designed a single paddle key with lutly adjustable silver contacts and spring tensions Ball race bearing pivots together with lIre twinspring arrangemenl ensure a positive return of the key arm to the centre position Machined parts are horn solid brass and mounted on a steel base tor stability £38.00 (assembled) £31.00 (in kit form) This nice pic was taken at the recent the groom's father, Len Dunn, G6DOV; Plus £2.50 post and packing. wedding of Chris Dunn, G4KVI, con- and Ray Caws, G3BRL. troller of the Mid-Thames RAYNET When not courting the bride, Chris KEYS OF UNBEATABLE QUALITY AT UNBEATABLE PRICES! group. has been very active on the radio. He Pease 'stile phone or le lor further details lo Those standing are, from left to obtained his licence soon after his right: Gerry Hussey, G4PGZ; John 16th birthday and quickly became Hughes, G4KGT; Mike Edmounds, involved with RAYNET; he has also R. A. KE N T (E N GI N E E R S) GODNJ; and the bridegroom, G4KVI; helped John Hughes with JOTA (KENT) the bride, Fiona (an SWL); Dennis nearly every year. We wish bride and 243 Carr Lane. Tarleton, Preston Lancs PR4 6YB Telephone Heskelh Bank (07121 814998 Fax 107721 815437 Sherley, G4XGK; and Matthew Cab- groom health and happiness and lots ban, G1WPF. Seen sitting L to R are of harmonics.

RADIO COMMUNICATION October 1989 13 ECM

John Nelson, GW4FRX, goes behind the scenes to visit the RAF's 'ORM Wing'

You may remember that history was made a few months ago when - with the blessing of the DTI - an airborne special event station came on the air from a Royal Air Force Canberra aircraft whilst it was carrying out a routine training mission. GB2CAN/AM was marking the 40th anniversary of this classic aeroplane, and a great success it was too. To many radio amateurs, however, the normal task of 360 Squadron - which operates the Canberra 117s and T17As from RAF Wyton, near Huntingdon - is just as fascinating as the prospect of working an aeronautical mobile station, and a number of people asked us for more information. So to make something of a change from our normal fare, we thought we'd look a little closer at the activities of the very few groups of people in the UK whose daily job is jamming!

'RADAR' IN NATURE Most people know that bats in flight emit a series of high-pitched squeaks. If your hearing is keen enough you can even detect them. These sounds actually have a very complex structure and ELECTRONIC COUNTER without them the bat wouldn't eat; they are reflected by prospective prey such as an insect and analyzed by the bat's 'software' so as to provide information about where it has to go in MEASURES order to capture the tasty morsel. It's a highly precise system. On a still summer evening in the country you can throw small pebbles into the air or its speed'. Three years later a gentleman called as part of a formidable air-defence system. He and watch the bats swooping towards them, Christian Hülsemayer took out a patent on his also supplied complete theoretical calculations to twisting and turning at very high speed until they 'Telemobiloscope' which used principles very back up his case. Some experiments on 26 break off as returns from the pebble are swamped similar to those found in modern radar. Unfortu- February 1935 with one of the BBC's short-wave by reflections from the ground as it falls back to nately for him, no-one took the slightest interest in transmitters used for the 'Empire Service' from earth. Hülsemayer's invention. By the First World War Daventry and a mobile receiver in the back of a van No doubt as a result of millions of years of the cathode-ray tube had been invented, and the a few fields away quickly proved that he had been evolution, the bat's 'sonar' or 'acoustic radar' is first magnetron for producing very short wave- correct, and the rest is well-known history. By extremely effective. However, one Central American lengths appeared in 1921. In 1925, two American 1936 the first Radio Direction-Finding (RDF) moth - the Melese Laodamia Druce, to be precise scientists, Breit and Tuve, used pulsed RF energy station - the name changed to 'radar' in 1944 and - doesn't care for the idea of being a bat's to measure the height of the ionosphere. Late in is the American acronym from 'RAdio Detection breakfast and has evolved a clever counter- 1933 Dr Rudolph Kühnold. then head of the And Ranging' - was on the air, grossly overrunning measure to its sonar. The moth has receptors Communications Department of the German navy, valves rated at 10kW peak pulse power to produce which are very sensitive to the sounds emitted by obtained from the Philips company in Eindhoven almost 200kW pulses on about 6fv1Hz. The RDF predator bats; it also has an acoustic generator a device capable of generating the then unheard- stations which were operational in time for the operating on the same frequencies but with the of power of 70W at 600MHz; by 1934 he had in 1940 and formed the 'Chain added refinement that it can vary them slightly. produced a working radar capable of detecting Home' or CH, used about 150kW on frequencies When the moth picks up signals from an attacking ships at a range of a few miles. between 26 and 29MHz; with their 320ft masts and bat, it switches on its generator and then gradually At about the same time in . the four-wide collinear arrays of full-wave dipoles and reduces the frequency of the 'transmissions'. Superintendent of the Radio Department of the reflectors, they were - to say the least - rather Since the moth's 'transmissions' are much stronger National Physical Laboratory, Dr Robert Watson- large. Later in the war, as it became possible to than the reflected signals from the bat's radar, the Watt, was asked by the whether generate and control much higher frequencies, bat's 'receiver' is 'captured' by them; the change in anything resembling a 'death-ray' - a common radar equipment shrank sufficiently in size to be frequency is interpreted by the bat to mean that obsession of inventors at the time - could be carried on board aircraft. The turning-point was the moth is flying away from it at high speed. So it produced using radio techniques, with a view to the invention of a radically new microwave breaks off the attack and the moth lives to fly and incapacitating the crews of enemy bombers. generator by J T Randall and A H Boot at the fight another day. Some other moths have also Watson-Watt replied that radio-based death-rays University of Birmingham. Development began in evolved counter-measures to bats; they transmit were not practicable but that reflected radio November 1939. and on 21 February 1940 power acoustic signals with random repetition rates, or waves could be used to detect aircraft, if that was was applied to the world's first 'cavity magnetron'. make such a racket that the bat temporarily of any interest. He added that it was also possible Whereas in previous years the available devices doesn't know which way is up, so to speak. to use a cathode-ray tube to display the range and only permitted power levels of a few milliwatts to bearing of a target from the transmitter. be generated at frequencies of several gigahertz, ORIGINS OF RADAR At this period the Air Ministry was greatly the new device did rather better. As one noted You'll no doubt be aware that radar works on a exercised by the problem of how to detect enemy author put it: very similar principle to the bat's breakfast- aeroplanes coming in Britain's direction, and "The fact that it worked was obvious. Indeed, if detector. As early as 1900, Nicola Tesla wrote that Watson-Watt was invited to demonstrate the truth one brought one's hand near the output lead, that with radio waves 'we may determine the relative of his assertions. In a historic memorandum dated hand soon became uncomfortably hot. As power position or course of a moving object, such as a 12 February 1935. Watson-Watt described the was increased, the output began to be seen and vessel at sea, the distance travelled by the same. basic principles of radar and how it could be used heard as a sizzling violet arc dissipated into the air

14 RADIO COMMUNICATION October 1989 ECM of the lab. A nearby garage supplied a succession of 6V bulbs as each in turn was burned out, and soon the output was blazing forth from large neon floodlights. This was obviously not milliwatts but hundreds of watts. On the second day a crude measuring device, hastily rigged up for a totally new task, measured about 450W at a wavelength of 9.8cm; three months later a properly designed pre-production magnetron was delivering 50kW at 9-1cm! It wau a breakthrough that ranks alongside mankind's greatest technical accomp- lishments. It had a profound effect on the war and on man's subsequent ability to navigate the skies and oceans" (Bill Gunston, Night Fighters). The so-called 'radio war' began in about 1940. when both Britain and Germany began to jam each other's radar and radio-based navigational aids; the history of this form of warfare has been well outlined in the books Instruments «Darkness by Alfred Price and Most Secret War by Dr R V Jones, amongst others. Nowadays, of course, radar is predominantly used for peaceful purposes, and as such it has become indispensable. However, it also has various military uses, largely the obvious ones of knowing where an enemy is coming from and how close they are. It can also be used to guide missiles to their targets. Given the CM Barrie Smallshaw, G7CSY, secretary of RAF Wyton sole function is to operate all the interesting modern emphasis on electronic systems, what is Amateur Radio Club. equipment. In his time with the Squadron Rod now known as the science of 'electronic warfare' is Angel was an EWO; not only did he operate the an important part of present-day military operations. the operating room. The HF antenna was most radar jamming but it was his job to carry out In particular, radar in various forms has been a impressive; someone had obviously been 'scroung- various other misleading tasks which we'll come major component of air-defence systems since ing' on a large scale, since one end of the long- to later. As a matter of interest, 360 Squadron is the Second World War, and it's obviously necessary wire was supported by an official-looking lattice the youngest in the Royal Air Force, having been in times of war to be able to render it ineffective; tower painted in regulation green and giving the formed in 1966. It is unique insofar as it is manned conversely, it's mandatory for military radar oper- strong impression that it was part of an important jointly by RAF and personnel in a 3:1 ators to have some idea of what happens when an RAF installation! The Club receives very little in ratio, and the Naval element is reflected by the enemy starts jamming and how to deal with it. the way of financial support from the Royal Air trident forming the other component of the On that basis you probably won't be surprised Force and relies heavily on the ingenuity and Squadron badge. to hear that the Druce moth which we mentioned generosity of its members. I was informed that the earlier forms part of the badge of the Royal Air most unlikely items had been sold at junk sales to JAM MING EQUIPMENT Force's 360 Squadron - since interfering with the raise money for the Club; however, 360 Squadron There are several main items of jamming gear in function of radar in various subtle (and not so still seemed to have its full complement of aircraft the aircraft collectively they are known as the subtle) ways is its main job. The Squadron's when I counted them later... ECM (Electronic Counter-measures) equipment. motto, 'Confundemus' which is translatable as After that it was time for a thorough briefing on The first is the JS603, which deals with 'X-band' 'We Shall Throw Into Confusion' also gives a nice their aircraft's capabilities. The 360 Squadron radar on wavelengths around 3cm. Another X- clue to the nature of its activities. 360 Squadron's Canberras carry a crew of three - pilot, navigator band jammer, the Plessey Repeater, handles a formal role is to provide flying effort for trials and and a specialist electronic warfare officer whose similar part of the RF spectrum. There are also to give realistic training to members of NATO and jammers covering 10cm and 30cm radars; an all three Services in the UK; it takes part in virtually Nina alternative fit includes a UHF Jammer. Just the all major air and sea exercises mounted by United thing for causing mayhem on VHF Field Day! In Kingdom and NATO forces. To carry out its addition, the T17A carries something called the mission it has six Canberra T17 aircraft, together Sylvania Dragonfly, which is a programmable with another six of the slightly different Ti 7A. high-power communications jammer. There are various jamming techniques which 360 SQUADRON can be used. The obvious one is to generate and To learn a little of how 360 Squadron goes about transmit noise; this can be done over a variable its business and also to have a closer look at the bandwidth and can also be made to 'blink' on and equipment used for GB2CAN/AM. we visited RAF off in such a way as to fool some radars in a Wyton recently by kind permission of the Station particularly nasty way by changing their receiver's Commander, Group Captain R McKendrick. We AGC threshold.'Spot' jamming is the transmission spent a highly enjoyable day in the company of of noise on a particular frequency, whilst 'barrage' the operator on the GB2CAN/AM trip - Flight jamming covers a wider frequency range to cater Lieutanant Rod Angel, G4ZUP - and the first stop for more than one radar at once. There are then was the well-equipped shack of the RAF Wyton some extremely devious methods which are Amateur Radio Club, G3MMH. The Club has 12 similar in principle to those used by the Druce members currently on the books, with about four moth, only more so. Many modern radars use the short-wave listeners. Of the licensed members, Doppler principle for various purposes, and a three hold Class B licences. Despite being run on technique called 'velocity gate pull-off' totally a shoestring and relying very heavily on the time- confuses them! Another tactic is to emulate the honoured military technique known as 'scrounging' moth directly with 'range gate pull-off' thus the Club has a shack to be proud of. It was fooling the radar into thinking that you're somewhere beautifully laid-out and extremely tidy; there was other than where you really are. A technique a large area set aside for working on equipment. known as 'wobbulation' sounded even more evil; I and an FT101 and Pye UHF base station, together was told that in the hands of a good operator, with an lcom 144MHz FM rig, took pride of place in wobbulation can cause the radar dish antennas in

RADIO COMMUNICATION October 1989 15 ECM

All this equipment obviously needs quite a lot of power to make it work. The Canberra has twin Rolls-Royce Avon gas-turbine engines and each one drives a 28V DC generator; regulation is performed by a carbon-pile system similar to the ones which disappeared from motor cars many years ago! In addition, bleed air from each engine drives a 3-phase 400Hz 115V AC alternator. These apparently trip off-line when the engines are throttled back, as on final approach, and since the I-IF transceiver is driven from this power source it suddenly ceases to work. This is why GB2CAN/ AM went off the air rather abruptly at the end of the flight as the Canberra was preparing to land at Wyton.

SCATTERING CHAFF One thing that doesn't need any power at all, however, is a jamming technique called 'chaff'. Chaff consists of strips of metal foil cut to half the wavelength of the radar which you wish to jam. Some of the less conventional (I) radio equipment on board. When you're ready, you just dump some overboard and the enemy radar reacts in one of two ways. even modern air-defence fighters to perform noise generator. The 3GHz-band antenna is a Either it interprets the result as an enormous some involuntary gyrations which are violent 'Narda' horn in the nose of the aircraft with a number of hostile aircraft or it simply gives up and enough to be heard by the fighter's crew. Not horizontal beamwidth of 11°. For the 3cm band. paints a large blob on its CRT; the chaff thus forms surprisingly, the radar doesn't have much in the the transmitting antennas cover ±15° at the front a sort of 'electronic screen' behind which your way of ability to track a target whilst it's being and 145° at the rear; the receive antenna can see aircraft can manoeuvre unseen by the enemy. subjected to this treatment. Yet another trick, over about 170°. Various lumps and bumps on the Even in an age of sophisticated electronic tech- called 'inverse gain' makes the radar think that its airframe house antennas for the other bands. niques, chaff is still very handy to form a screen if target is nearer or further away than it actually is. As far as communications go. the Canberra has enough of it is used and the Canberra carries No doubt 360 Squadron has some other tricks up an HF transceiver, the Collins 618T, one of which some in pods mounted al the wing tips. their collective sleeves too. The other area of their was used for GB2CAN/AM. The 618T runs 400W Finally, it was time to make our way out to a T17 activities, which clearly calls for a decidedly well- of SSB to a long-wire antenna running from the parked just outside the hangar and have a look developed sense of humour, is 'spoofing' - i.e. port side of the nose to the top of the fin: an inside. The aircraft sits low on the ground and you giving convincing-sounding (although totally spur- automatic ATU makes it a reasonable match to the have to wriggle through an entrance hatch on the ious) orders to other parties. Rod Angel obviously transceiver, although I gathered that the antenna starboard side of the nose and then slither enjoyed that part of the job! worked much better at some frequencies than backwards in a rather undignified manner on your If you're going to inflict all sorts of confusion on others! There are also two UHF transceivers derriere in order to reach the rear crew compartment. the operators of a particular radar, you've obviously covering 225-400MHz and running about 16W of The navigator sits on the left, with the EWO on the got to know what frequencies it's using. The T17 AM via small 'blade' antennas at top and bottom of right; the jamming equipment is in front of him and carries an intercept receiver covering all the the fuselage, together with a VHF transceiver on his right-hand side. The rear accommodation necessary radar bands: this has a panoramic covering the normal civil aeronautical band. For in the Vulcan bomber used to be likened to a coal display which can show small tunable segments navigation some aircraft carries the 'Omega' mine with switches but it was rather cosy in the on its screen. The T17A has a refinement in the system, which uses VLF signals and works pretty Canberra although you couldn't see a great deal form of a Tektronix 492P spectrum analyser, well anywhere in the world. For shorter-range of the outside world. Rather a nice mobile shack, I perched precariously at eye-level just in front ol stuff there are the usual military TACAN (using a thought. Interestingly, the Collins 6187 HF trans- the operator. It has its own antenna and can be clever pulse system at about 1200MHz for finding ceiver lives right at the front of the aircraft and is quickly used to produce the usual picture of bearing and distance from a beacon) and the fully remote-controlled. I gather that despite the events taking place in the RF spectrum. rather similar VOR as used by civil aircraft, bumps and bounces it receives in normal service, The jamming transmitters are pretty powerful: together with the decidedly steam-age 'Automatic the rig is very reliable and doesn't often give all run about 200W. The 10cm-band machine uses Direction-Finder' or ADF. This works on non- trouble. The modular construction makes it easy an oil-cooled backward-wave oscillator (BWO) to directional beacons in the long and medium-wave to work on. and those who work on them seem to produce what was described as 'noisy RF'. This bands, and in my experience the needle of this like them very much. sort of power level at 3GHz is the stuff of dreams to instrument tends to give the bearing of the nearest At the end of the day I asked Rod Angel what he most of us, but I gathered that the BWO is strictly a thunderstorm rather than the beacon it's tuned to. liked about his job. He said that it was technically demanding and very satisfying; Rod remarked deoms,\, that military activities are usually governed by very strict rules, especially in the area of rules and procedures for the operation of radio and radar , but that, as far as the latter was concerned, it was his job to break them! As well as being professionally very rewarding, Rod said that it had sometimes been very good fun. It certainly sounded like fun to me, and I can think of worse things to do if you have an interest in electronics and a bent for flying. Mind you, if I'm operating on VHF Field Day in a few years' time and 1296MHz gets wiped out, I'll know who to blame...

The Society wishes to thank Group Captain R McKendrick, Wing Commander J Donnelly, Flight Lieutenant R Angel and Flight Lieutenant M Humphrey for their help in the preparation of this A view of the Canberra T17 flight deck and instrumentation. article.

16 RADIO COMMUNICATION October 1989 serial number received from the P.O.Box 30. Berlin 1055, GDR, by RNARS Activity Contest Kuwait station, together with six no later than 28 February 1990. 0600-1800 15 November (SSB) IRCs (or US$3.00) to Award 0600-1800 16 November (CW) Manager, 9K2MJ, Kuwait Amateur DXCC ON 10MHz? 3.5 to 28MHz centred around 3.74. II Radio Society. PO Box 5240 Safat, It is almost certain that by the time 7.05. 14.335, 21.34, and 28.933 MHz 13053 Safat. Kuwait. this iS being read there will have (on SSB) and 3.520, 7.02, 14.052, SPECTRUM been a change of policy in Region 2 21.052, and 29.052MHz (CW). Open concerning the issuing of awards to all, including listeners. Call "CO 60 years of Amateur Licences in the on 10MHz. This as a result of a naval" and exchange RS/T plus ANALYSIS Netherlands paper being presented by ARRL at RNARS. INORC, MF, or MARAC The first amateur licence to be the Region 2 Conference in early number and serial OSO number issued in the Netherlands went to September. It says "...after careful (from 001) Copies of rules available PAOBZ in 1929 - and to celebrate consideration we have concluded from me - SASE please. In the HF the fact, VERON has obtained that the Amateur Service in Region RNARS members section of the JOHN ALLAWAY G3FKM permission for Dutch stations to 2 would benefit from the slight 1988 SSB contest, GD4MNS (45,980 use special prefixes between 1 relaxation in the absolute points), GOCBY (27,300), and LA1IE Recently I received a copy of a October and 29 November 1989. prohibition on 10MHz awards (24,160) led the field. In the CW book produced by DARC and During this period they may add a credits. If Region 2 accepts this event, GM4CXM scored 641,280 written by Hans Schwarz, DK5JI. figure '6' before the number in their change in policy, it is the League's points, G3LIK 401,460 and I4TYE This runs to some 196 pages in A4 normal prefix - so PAOs will intention lo accept 10MHz contacts 381,600. format and is the most complete become PA60s, for example. This for credits towards the Worked All source of information on callsigns special certificate will be given to .States Award (basic, OW, RTTY. ON Contest that I've ever seen. In the first all, including listeners. European packet. and QRP endorsements) 0700-1100 1 October (SSB) chapter the fundamentals of stations need 30 special prefixes, and DX Century Club (OW and 0700-1100 8 October (CW) callsign assignment are presented. and DX 15. Listeners need the same digital contacts for the mixed, CW Exchange RSTT and serial OSO The use of callsigns, the method of on a 'heard' basis. The standard and RTTY awards, but not Five number with Belgian and DA assignment and their formation is certificate is for mixed modes and Band DXCC)... ARRL believes that stations. The latter will give their described in both English and covers HF, VHF, UHF and SHF. single-band awards and club code. Each OSO counts three German. The allocation series by Special endorsement will be made endorsements for 10MHz operation points and each club is a multiplier. the ITU is given within the main as required and for CW, SSB and should continue to be avoided." Listeners may enter and log time. part of the book. For each series all listeners. Send log extract, certified callsign of station heard, code given identifiers, prefix numbers and by two other licensed amateurs, to and callsign of other station. Send suffix series used are described in reach PAOBN 'through the normal logs within three weeks of the detail. For each prefix or prefix/ QSL channels' by 31 March 1990. CONTESTS contest to Welters Leon, ON5WL, suffix combination, the DXCC/VVAE During this period the HF Traffic Borgstraat 80, 82880 Beerzel, country is indicated if applicable - section of VERON will be making CO WW DX 5S13 Contest Belgium. as well as the continent and the special efforts to promote action on 0000 28 October to 2400 29 zone number for ITU and WAZ. The the WARC bands. October. DARC FAX Contest main list is followed by a complete All bands 1.8 to 28MHz (excluding 0800 28 October to 2000 29 DXCC/WAE countries list with DDR 40 Award WARC). Single-operator, single and October. notations of all callsign series in This is being issued by RSVDDR to multi-band, multi-operator single Copies of rules available from me - use as well as beam direction (this celebrate the 40th anniversary of and multi-transmitter and QRP SASE please. is from DI_ however), local time, the foundation of the GDR on 17 categories (the last allowing up to continent, ITU zone, WAZ zone, October 1949. It is available to 5W output). Exchanges are RS and Lion City Award OSO Party and ITU region. Callsign entries licensed amateurs and listeners and CO Zone (UK is 14). Contacts 0000 - 2400 21 October may be made for each country on requires a minimum of 40 points count one point with own continent 3.5 to 28MHz (no WARC bands), all nine HF bands, together with gained during October by working and three with others. The CW and SSB. Send RS/T plus CO VHF, satellite and different modes. Y stations. Each counts two points multipliers are the CO Zones and Zone. Singapore stations send RS/ Deleted countries are also listed. on HF and four on VHF. Europeans DXCC countries, plus WAE T and serial OSO number. Stations The book ends with a list of ITU must work at least ten GDR countries (eg Shetland). Own working five 9V stations during the allocations and index. The Call Sign 'counties' as indicated by the last country may be contacted for OSO party may claim the award by Directory (4th edition) costs DM letter of the callsign suffix. The country and zone credit only but no sending full log details plus three 16.80 from DARC Verlag, Postfach special station Y4ODDR may be OSO points are allowed. Final score IRCs. At other times the Lion City 11 55, D-3507 Baunatal, used in place of a missing county. is total OSO points times total Award is available to amateurs and F.R.Germany - highly The award is free to blind and multipliers from each band added listeners who have confirmed recommended. disabled amateurs but costs 7 IRCs together. Use separate log forms for QS0s/reports with five 9V stations. to others. Send confirmed log each band and give date, time, Applicants should send a certified A WARDS details to Y2 Award Bureau, station worked, numbers out and in, log extract plus five IRCs to Awards and mark multipliers the first time Manager, SARTS, Maxwell Rd, P.O.Box 2728, Singapore 9047 The Peace and Friendship Games 28MHz COUNTRIES TABLE they are worked. Logs must be Championship G4MUW 173 checked for 'dupes' and those making more than 200 OSOs on This is being organised by the GOCKP 171(CW) DX NE WS Kuwait Amateur Radio Society to GOIHB 159 any one band must provide a cross- mark the games of the same name G4DXW 161 check sheet for that band. OAP Maurice French, G3ZXD, writes that which are taking place there. It is G4ZYQ 151 stations must mark the fact on their after two and a half years in Saudi GM4ELV 147(OAP) open to licensed amateurs and summary sheet and state the actual Arabia in the amateur radio G4XAH 134(888) listeners, and covers 3.5 to 30MHz power output. All entries must be G4OBK 115 wilderness, he has returned to and any mode. Contestants must G4NXG/M 113 postmarked by 1 December 1989 Wellington, New Zealand, and is work or hear two different Kuwaiti GOJSM 111 and mailed to CO Magazine, 76 ZL2BNJ again. He noticed lack of stations or the KARS station 9K2RA GOJHC 107 North Broadway, Hicksville, NY, ZL activity in contests when in HZ, during the period of the games GOBXQ/M 106 11801, USA. Sample log and and after talking to members of the (between 0000 30 October and 2400 GD4XTT 98 summary sheets are available from N2AA CO WW group Maurice 12 November). Entrants should G4SJG 81 CO in exchange for a large sae and decided to form a contest group in G4SDK/M 54 send certified log details including some IRCs. I'm sorry that I don't Wellington. The result is a GM4OBK 41 date, time, station worked, and have any to offer this time! dedicated band of about 12 who are

RADIO COMMUNICATION October 1989 17 SPECTRUM ANALYSIS

known as the 'Kiwi Contest Group' him! Weird... 5138JD QSLs do not 0TH CORNER and use the callsign ZL2NX. They count for DXCC since he only has A35KB Fr Kevin Burke, SM, Box 1, Nuku'alofa, Tonga. will operate from the coast east of verbal permission to operate. A35SK SM5COT. All Thunstrom, Karlslund, S-61056 Vrena, Sweden. Masterson and hope to be on all BY5VZ Box 238, Fuzhou. PR China. 5H3TW now has a licence in bands 3.5 to 28MHz with 4-element C3OLBS IK1CJT, S.Tacca, Viale Parona 9.1-28024 Gozzano, Italy. Djibouti where he is J20TW. J280N monobanders for 14, 21, and 28Mhz CYODXX VE1AL, Alan Leith. 846 George St, Sydney, NS, B1P 119, is on most days near 21.28MHz and loops for LF. Maurice sends his Canada. around 0300, and J28CW likes CW regards to all who know him as 679MX HB9MX, K.Bindschedler, Strahleggweg 28, CH-8400 around 28.55Mhz from 1430. G4ZVJ G3ZXD. Winterthur, Switzerland. is on Ascension Is as ZD8VJ for a 13210 AH610, 263 Kiaulani Av 10-A, Honolulu, HI 96741, USA. Six-month stay and promises all- AH2BE/KH9 will be a five-man VS6CT P.J.Weaver, G.P.O.Box 12727. Hong Kong. band activity, mostly on CW. FT4ZE contest station on from Wake Is XT2CW Audi Klos, DK7PE, Kleine Untern 25. D-6501 Nieder Olm. FR during the CQWWDX Contest at the Germany. on Amsterdam Is can be found on end of this month. N8B0J/KH9 will ZYOTI PP2BNO, PO Box 5016,74000 Goiania, GO, Brazil. 14.165MHz between 1000 and 1300. also be on before and after the 3D2RJ ZUBOD, 36 Cardiff Rd, Pakuranga 1706, New Zealand. Peter, G3LPL, is in Maseru, Lesotho contest, mostly on CW and on all and is one of the two active CW bands 1.8 to 30MHz. operators there. He will be there for (W.Samoa). KS6/SM7PKK other Costa Rican amateurs may two years as 7P8EL. WA9INK, who OH2s AY, BAZ, BGD, and VB are (American Samoa), and also from visit Cocos Is as TE9OM in the not operated recently as SUIEE, is now due to mount an expedition in the T30 (W.Kiribati), ZK3 (Tokelau Is), too distant future. PJ5EUX will be in Zaire, probably with the callsign Pacific between 19 October and 23 and ZK1 (S.Cook Is). Frequencies on from St.Eustatius on 16 905EE. November. YJORY will be on during to look for him near are 5kHz above November for 24h. The PJ5 prefix Also according to DX News the CQWW SSB Contest and there low band edges (CW) and the usual has been reserved for residents on Sheet. BZ4RDX said that he is the may be operation from Fiji or expedition spots on SSO. 0SLs go the island and there are now three first individually licensed amateur in Willis Is at the same time. Conway to his home call, but please don't amateurs settled there. China and that he received his Reef is a prime target and they mix cards for different callsigns in A fascinating comment in DX licence in August. Another should be on from there between 3 one envelope since each will be News Sheet quotes a report from a individual licence holder is Kang, and 13 November as 3D2RY. dealt with by a different person. reader who heard 5R8JD on 28MHz BZ4SAA, who often operates from SM7PKK leaves Sweden on 16 CEOZAM is said to have been and at the same time a group of BY4SZ - he was one of the October for a 4-6 month visit to the given the callsign CEOXOX to use people in a net on 21.333MHz who operators who took part in the Mt Pacific area. He hopes to be on the during a visit to Ambrosio Is, which were also giving and Everest expedition last year. I have air from 3D2KK9 (Fiji), 5WI HK may take place soon. TI8CBT and acknowledging '3x3' reports with heard from Phil, VS6CT, who has

HF F-LAYER PROPAGATION PREDICTIONS FOR OCTOBER 1989 The time is represented vertically at two-hour intervals 00(00)GMT for each band, ie 00=0000, 02=0200. 04=0400 etc. The probability of signals being heard is given on a 0 (indicated by a dot) to a 9 scale: the higher the number the greater the probability with 1 meaning 10 to 19 per cent of days, and so on. Additionally 50MHz F-layer and 1.8MHz openings are indicated by a plus ( +) sign in the 28 and 3.5MHz colums.

28MHz 24MHz 21MHz 18MHz 14MHz 10MHz 7MHz 3.5MHz lime / 000001111122 0000011111 22 0000011111 22 000001111122 000001111122 000001111122 000001111122 0000011111 22 GMT 024680246802 024680246802 024680246802 0246E10246802 024680246802 024680246802 024680246802 024680246802

.4 MOSCOW ...1 899982.. ... 3999995.. ... 69999982. 1.. 888889952 533766668997 987543346899 87521111 3688 .42 3.. MALTA ...1887774.. ... 29998961. ... 699999941 21. 888889973 764876678998 998743346899 9874111 24788 +.5 4.. GIBRALTAR .... 576553...... 7987761. - . 9998984. . . • 298889972 442787778997 997864446899 99863211 3689 .4,3 3.. ICELAND 46652.. - .128824.. ... 4899972. .... 7888995. 32.187778985 885665456899 888632224678 ...3 34+ .. ASIA OSAKA ... 2861 3972 .586421..1 . .475432212 ...152125665 2. . HONGKONG - . 5..862... - 4888752 ... 267677521 1 - 45458743 2...12126887 1 W ilZ 15731551 24.22. BANGKOK • • • 6..4,133. . • • • 4788895• • • • • 136679831 2...15458964 4. . . . 21 26898 3 3788 1 1576 243 SINGAPORE ... 6888983.. ... 56888961. ...1 3667983/ 2...14458964 4. -1126898 2 3787 1575 242 NEW DELHI ... 7...83...... 568886... 1.1226678322 311.. 4458634 74...1126888 73 3789 51 1577 2 244 TEHERAN 1577 5...8....83- ...86788961. 1.3634679843 425412358976 8651..126899 9734789 74 244 COLOMBO . . . 7...+94 . . . . . 55788961 . 2.1 225679943 41... 3358976 83.. .. 126899 71 4789 4 244 B - AHRAIN 8..8.841. ..1766889621 313523679964 6353.1458987 975...126899 972 37E19 74 1 U; 5 245 CYPRUS - . 7...+961. ... 099999831 312987889074 645866778997 988633537999 99631. 225899 8741. - 2688 .5 355 ADEN - . 8..8.9621 1.1755889853 523522579986 8553.. 358998 985.... 26999 973 3789 75 1567 52 234 .11 OCEANIA SUVA/S - . 257731.. 478853. . -17767761. ... 37545871. ..1 6521266.. .2. .11. SUVA/L 32.24421.475 33 .465421674- 222775433852 .13E17433583. ..2741.1 56.. ...I ..... 1.. WELLINGTON/4 .... 687521.. - 1 8E18753.. - . 48767761. ... 67545872. ... 652I2672. 11. WELLINGTON/L 22..1 ..... 22 331231...1 33 2335521.. 353 .136631.1541 ..1651.1462. 1 SYDNEY/S ... 69138852.. ... 7988874.. ... 68767872. ... 475458951 ...142126861 151. 2 SYDNEY/1- 111. 531... 54 1211 7421. 274 111274222573 ... 252.1475. 3 PERTH - 7..8;62.. ... 68988841. 1.1 356670742 2..134358975 2....11 26897 4784 1562 24. HONOLULU 14. . 1... 261. . .421. 572. .21. 6321771. .244521164. ..562... 31.. .. AFRICA SEYCHELLES ... 777874531 2.1 655876753 522322668987 8431.. 458999 972...1 26999 95 3789 72 1567 5 234 MAURITIUS 1.. 78.099742 2.. 666889964 622323679997 8531.. 458999 961 -1 26E199 84 3789 61 1577 4 244 NAIROBI 1.. 7.7898853 31. 765689975 743522369998 9753... 58999 996.... 26899 983 3788 761 1577 53 244 HARARE 2.. 777789874 42.755689987 852522279999 9853... 58999 996.... 26899 984 3788 761 1477 53 244 CAPETOWN 31. 587889986 53.776679998 87274335E1999 98561.1 38999 9973.... 5899 985 2689 772 477 54 44 LAGOS 32.3 986 64.686569998 873862238999 99684..1 6999 99971. .3B99 8984. .1689 6771 477 444 44 ASCENSION Is 22.1 98767765 541296557887 874582124899 99686... 2899 99984.... 699 89861.... 389 6763 67 334 34 DAKAR 21 - 9....985 4411 97657997 774485225999 997672.. 2899 99985.... 699 88862. - 389 7673 LAS PALMAS .... 9..99961 11.1 99999983 342398888996 775687778999 998875445899 99974211 3689 88852 e Z ' 2 4. 24 •• S. AMERICA 5th SHETLAND 21.. 378+0885 441158887987 77447656568E1 897774342368 899851.1.1 36 67862 13 3553 1 .22 FALKLAND Is 11.. 58...884 331178876786 774386533578 99767431. 268 999851.... 37 89862 4 6873 2 354 R DE JANEIRO 11.. 3.766762 331. 68655785 664376211 588 987575 - 2E19 999752.... 69 99862 37 7773 2 BUENOS AIRES 11 - 48.77.84 221. 60755686 664206522378 8875753 -1 5E1 999752.... 27 89862 4 7773 LIMA 1....72 111.. 2865574 443134531247 77635431.. 27 099652 6 79862 BOGOTA 2...772 11 - 3865474 343.. 56311 57 67621531.. 28 9996321.... 6 89862 7I.;: , liî .. N. AMERICA BARBADOS 8....72 111.. 8855684 443.27621287 7762454. .69 9996521... 3E1 98862 16 7763 4 543 JAMAICA 1...762 11... 3875574 332.1 56411 57 66512542.. 37 9985421 . .6 89862 1 344 BERMUDA 7866784 332.27632487 66514541. 268 99E15521... 38 88863 3 6763 NEW YOR1 6...872 2E1.8861 4887773 321.. 5664576 553.25442367 89044211.. 37 78862 1 Z S 7763 3 2 444 MEXICO 298751 486552 221. 2.563234 553.41441.14 79845211... 2 58862 2773 .''1 1 MONTREAL 2888E151 4887872 221.. 5665686 553.25443477 813834211.147 88862 244 DENVER 5E174. 68751 22. .1 66544 442.1. 254224 6873411 21.. 3 47862 5 5673 .24 LOS ANGELES 1873 38741 22 57432 442.2.. 46212 576341. 23... 26052 .463 1573 4 VANCOUVER 362. 5731 11 27742 441.1.. 37533 575341. 25212 36852.. 2. . .363 7. FAIRBANKS 2. 1241. 1...11125641 32.132237733 554432126655 34652... 3322 .144 - .1. The provisional mean sunspot number for August 1989, issued by the Sunspot Index Data Centre, Brussels, was 166.8. The maximum daily sunspot number was 227 on 5 August, and the minimum was 50 on 28 August. The predicted smoothed sunspot numbers for October. November, December and January are respectively: (classical method) 178. 176. 173, and 169: (SI DC adjusted values) 186. 184, 180 and 175.

18 RADIO COMMUNICATION October 1989 SPECTRUM ANALYSIS now moved into a new flat but is off could have been reached by the 0900 BY5RA of a bonus and helped to offset the the air because he has no antennas. time this appears in print though it 1100 FY4FM, PYOFF, 7P8EL generally mediocre tropospheric mail box is very small and he could equally well be some months 1300 J52US, T5YD. YI1BGD conditions on the VHF/UHF bands. asks those writing to use his PO away. Whichever the case, we can 1400 ZD7VC, 905UN Box address (see 0TH Corner). expect HF band conditions this 1500 TZOMAR BEACON NOTE The 18MHz band was expected to winter to be at least comparable 1600 ZD9JR, 3X1SG Calum MacPherson, GMOEWX be released to Class 1 and Class 2 with those of the 1979/80 season 1700 XT2CW (HLD), passed on the news from licence holders in Japan on 1 July, and possibly approaching if not 1800 VP8BFH, 9VORH 0Y9JD that the 0Y6VHF beacon is and 24MHz was made available to exceeding those of 1957/58." 1900 V44KI now QRV again from the Faroes on all. JARL is planning to prepare 2100 OT6C, 9Y4VU 144.885MHz, running 25W. Around special awards to celebrate the 2200 FG89/FD1DMP, ZL40D(1.p) mid-July, weather permitting, it was release of the new bands. planned to erect two 4-element 1989 is the 20th anniversary of yagis. one pointing south east, the the foundation of the Singapore BAND REPORTS Thanks go to the following information sources — DX'press other north east for auroral studies. Amateur Radio Transmitting This month's reports came from (PA3CXC). CO Magazine (W1WY), I assume it is still at IP62NA. Society. and this year the SEANET G2s AKK, HKU. GM3CSM, G3s the DX Bulletin (VP2ML), DXNL Convention will be held there from GVV, KSH, VRU, YRM. G4EHQ, (DL3RK), the Long Island DX DX NEWS 17 to 19 November. To celebrate GW4KGR. G4MUW, G4NXG/M, Bulletin (W2IYX), DX News Sheet the two events. Singapore GM4OBK, G4ZYQ, GOs BXQ/M and Dave Court, G3SDL (KNT) has (G4DY0). the Ex-G Radio Club Telecoms has given permission for CKP. CW stations are in italics. received permission from the the optional use of the Bp( .iai Magazine (WA8GTA), DX Report Turkish authorities to operate in the (VK9NS), and the Lynx DX Group prefix 9V0 from 1 July until 30 3-5MHz 28 and 50MHz bands from Antalya Bulletin (EA2JGO). November. During the SEANET 0300 CYODXX (KM56) on the south coast of weekend an official station - Turkey. Operation was due to start Closing date for items for the 9VOSEA - will be on the HF bands 7MHz on 30 September and end in the December issue is 24 October. and special 50MHz tests will be 0000 ZD8PJ week beginning 8 October, using carried out by 9VOES - closet VHF 0200 CYODXX, TAIE/2 the call TA4/G3SDL. This is a readers of this column please note! 2300 XT2CW business trip so activity will be DL2GBT is in Malta until 19 limited to 1000-1100GMT and October as 9H3EH and will be on 14MHz VHF/UHF evening periods but with more HF as well as 50MHz, mostly using 0000 TGOFRACAP, TR8CJ, ZF2AZ NORMAN FITCH G3FPK intense operation during the 7/8 SSB. UAOBAZ/UA10 will be on the 0100 CEOMTY, October weekend. ORGs 50.11 and air from Alexandria Is in Franz FO5LZ(Marquesas). V31BB As we approach the peak of Cycle 50.13MHz, with the possibility of a Josef Land for a couple of years 0600 TJ/IKULL 22, the sun has become beacon on 50-095MHz. Paul Turner. and should be on all bands and 0700 A35SA. C21RK. FK8FG, increasingly active. Things were G41JE (ESX) will be 'anchorman' modes. According to the Long P29CG, SO1A, T3OAC, 73210, fairly quiet during the last week of over here, monitoring 50.11MHz Island DX Bulletin there is now a ZL7TZ. 9V1GY July, the solar flux averaging 174 and the 80m information net on USSR ORO Club which meets at 1700 HSOYDY units and the geomagnetic A index 3718kHz. 0700 on 14.070MHz: they have 1800 ZS8M1, 9M6HF 11. During the first week of August Dave Gascoigne, G40SY (YSW) applied for the permanent use of 1900 V85AM Old Sol was quite active, with 210 hopes to be ORV on 50MHz from the special callsign 4L1ORQ, which 2000 A71BK, T77T. 9N1MM units average and 233 peak being Bermuda (FM72) between 15 and 29 had been issued to them on a 2100 CY9SP1. CYODXX, HL5BD, recorded; the A index averaged 6. October using the call G40SY/VP9. temporary basis. Worldwide T5YD There was a surge in activity the When he wrote on 8 August he was membership is said to be open to 2200 ZYOTX, 4L1FS following week with many proton "looking out to buy/borrow a TS- those with the ability to work at at flares and ionospheric 680, HF/50MHz transverter. 50MHz least 34wpm. Details are available 18MHz disturbances, polar-cap absorption, amplifier and lightweight 3-element from UW3AA. 0600 TA7/KUOJ magnetic storm alerts and auroras. antenna." He will be ORV on the HF 1400 9M2RI The solar flux averaged 240, with a bands too. peak of 288, while the A index Ian Stewart, G1IMS (HFD) will be PROPAGATION 21MHz averaged 16, peaking to 37 on 10 on Lanzarote over the Christmas This month's contribution from 0700 BY5HZ, KL7XD, T3210, August. period. He has an apartment there, G8KG reads as follows: "The lull in UA10Y The third week of August saw a so he's applying for a special solar activity during July ended in 0800 BY5RY. FO5LU. JT1BC, massive increase in solar activity, licence to operate from EA8. Local the first days of August and indices T32P0, 3D2AG. 3D2XV. with some mind-boggling figures. amateur EA8V1, who works in the then climbed steeply. On 12 August 5W1FV On the 15th a ten flare of 19000 flux Air Traffic Control department at the daily solar flux peaked at 286 0900 A35SK, PYOFF, V85AM units triggered off a magnetic Arecife airport, doesn't think Ian SFU and it was still above 200 at the 1000 A35KB, TA7/KUOJ, 3D2S1 storm, which peaked with a huge will have any trouble. The local end of the third week, while the 27- 1100 3D2RJ proton flare at 0154 on the 16th. amateur radio club's callsign is day average had risen from a July 1200 T5MF This event produced particle EA8RCL, but its members weren't low of 182 to 220 SFU and was still 1400 HSOA1T. UMOT energies of more than 100 Mega- aware that many European rising. 1500 KL7XD. ZS3/DK2WH. 9VORH electron-volts and Ihe neutron countries now have a 50MHz "It seems probable that the 1600 BV5VZ, T32AB. 5R8JD, monitor on the island of Kerguelen allocation. So if Ian gets a average solar flux for August will be 9M6JR (ME field) recorded a very rare temporary licence, hopefully the in the vicinity of 225 SFU - perhaps 1700 XT2CW ground-level event between 0100 other EA8s on the island will apply, a monthly sunspot number around 1800 HL5BDS, K H6/WB6PZF, and 0800 on the 16th. The SF averaged 258, peaking to 278 and 180 - in which case Cycle 22 will 3X1SG DXPEDITIONS again be very close to the position 1900 CYODXX, 6V1A, 8Q7AC the A index averaged 33, peaking to of Cycle 19 at the same age. and 2000 HSOAIT, ZL4J0 63 on the 15th. Keith Talnall. G4ODA (LCN) has 28% above the corresponding value 2100 HL5BAJ, PAOGAM/ST2, The more northerly stations, sent the results of the Five Bells for Cycle 21. It is hoped to be able V29A0 such as Andy Steven, GM4IPK Contest Group's operation from to review this in more detail next 2200 FJ5AB. W6-W7 (SLD), have observed many auroras North Rona (1079) in July, using month. 2300 JA, ZL3GO resulting from this hyper-activity. In the callsign GB4XT. This "There is always uncertainty as to more southerly latitudes a few have DXpedition was no less than nine exactly when a solar cycle will 28MHz been rewarding, if not spectacular. months in the planning stage. They reach its peak, which means that it 0700 S79MX Anyway, auroras in August are a bit boarded their small chartered

RADIO COMMUNICATION October 1989 19 SPECTRU M ANALYSIS fishing boat on the 9th, the journey MS contacts on SSB and CW taking over eight hours in gale- were completed with stations in D. force winds. Landing on the north G. HG, HB9, OH and OK on east of the island the next morning 144MHz. Ten MS OSOs were went better than planned, but they completed on 70MHz SSB and had a two-thirds of a mile walk up a many on 50MHz with F. G and PA 300ft escarpment to reach the site! stations. Bursts were so long that it Operation started at 2121 on the resembled tropo working. The final 11th on 144.215MHz. At 2350 they location was a town called Ham, OSYed to 144.028MHz, their MS with such a poor take-off to the frequency, and worked two PAs on south that only three stations on the random to check out the station. Scottish mainland were worked. After some sleep, they The equipment was packed up recommenced activity at 0600 on on the 15th, but they couldn't get the 12th and were on continuously off the island for three days due to till 1130 on the 19th. via tropo in the gales, so they missed a huge aurora day-time and on MS at night. Tropo and, on the boat trip back. some Es. conditions were not spectacular: Stewart concluded, "This divine there were no usable auroras and intervention means that YU square only a couple of brief Es openings is as rare as ever it was - which is to F and EA4. probably not a bad thing." 116 of the 158 MS tests (mainly The other members of the team CW) were completed, many around Allan Duncan, GM4ZUK. operating the 144MHz station on the Foula DXpedition. were Allan, GM4ZUK, and Roger. the 2000km distance. Countries G3OHH. They would like to thank worked on all modes in 575 CISOs OK. UR and YU. The main highlight 9-element Vagis at 20It on a trailer- Frank, one of the 42 residents of included D, EA, F. G. HO. HG, I, LA, was three auroral sessions. The mounted mast. 80W and two 9- Foula - who helped them move 0E, OH, OK. OZ, PA, SM, SP. Y and 0Y6VHF beacon was copied at element Vagis were used at X080d. equipment - and regular visitor 1200 on the 14th and OZ. SM and Terry Robinson, G3W1JX, who lent YU. Notable contacts were ON5FF He used a 1.2kW propane-powered on tropo, DF8VU, probably via OYs were worked on CW between generator. them a hand on 50MHz. 1525 and 1538. The next event was tropo-scattter and F6DKW, mode Stewart Cooper, GM4AFF (GRN) from 2248 on the 15th to close- unknown. The station comprised an E-mailed the account of his group's down at 0302 on the 16th, and the REPEATER NEWS FT-225R0 with muTek RF stage, a activity in August from the small Most of the Summer Newsletter home built 3CX800 PA and lour 9- final affair was from 1411 on the island of Foula (IP8OXD or YU70d), 17th to close-down at 0028 on the from the Kent Repeater Group is element Vagis. 44km west of the Shetland 18th. Countries worked were 0, El, mainland. Operation was between devoted to the minutes and report 50MHz operation commenced at G. GI, GM, LA, OH, OK, OY, OZ, the 9th and 15th to include the of the AGM held on 26 May. It was 1340 on the 12th using an FT-736, PA, SM, SP, UR, Y and GWOKZG/ Perseids shower. For various the first effort by its new editor 25W PA and 4-element Vagi. A few MM (J005). Most OSOs were on reasons they had to move their Tony Young, GlAJY. who managed Gs were worked on MS but the bulk CW. On the way home, David operating site three times, so to squeeze in a half-page of news of of the 94 !DSOs were via Es to CT. stopped off at XO8Od on the 20th missed some earlier MS skeds. the group's repeaters. The seven F, GJ, PA and SV. They closed for about five-and-a-half hours of The 144MHz station comprised a relays mentioned all seem to be down at 2131 on the 18th. 430MHz tropo operation. TS-780, 40W driver, Tempo working satisfactorily, even though operation was limited to four days About 200 auroral OSOs were amplifier and 19-element MET the very hot weather did cause from the 14th and resulted in only made, the final tally for the trip antenna. For 50 and 70MHz they GB3EK to drift a bit. The secretary 22 contacts, best being with G3LOR being 18 countries and 78-plus used a TS-430 with Microwave is Kelvin Fay. GOAMZ, who is (SFK). The gear was an FT-736, squares worked. At XS40g the Modules transverters. 100W solid OTHR. home built 3CX800 PA and four 17- station comprised of a modified IC- state amplifiers and a Jaybeam 4- The Summer issue of element Vagis. 202S with digital display, BF988 element dual-band Vagi. All Talkthrough. the newsletter of the The departure from the island front end with SRA-1 mixer, home- antennas were mounted on a 22ft UK FM Group (Western) runs to 32 took place in two stages and built 200W solid-state PA and four mast. pages of diverse material, including resulted in some publicity in the the odd 'Heard on the Repeater' local press and on the local radio - anecdote, viz; One G7 to another: but that's another story! The "There must have been a lot of operators were John, G4NPH: passes in the last exam, George. I Julian, G4YHF; Dave, G4YTL; Chris, worked a G8 the other night. Have G1IJC; and G4ODA. to whom we you heard one yet?". There is are all indebted for putting on a fine plenty of information about the show from an uninhabited and group's repeaters and a list of the inhospitable island. 483 paid-up members at 10 July. David Johnson, G4DHF (LCN) PO Box 73. Crewe is no longer was unable to join the XT team due available, so if you want details to work commitments but did write to either G3LE0 or G4WSS, manage a one-man, two-site both OTHR. DXpedition to Scotland. Between 11 and 18 August he operated from a WORKED ALL BRITAIN 600ft hill at XS40g (I078WN) on the Sutherland coast, and endured In its September press release, the four-and-a-half days of 50-60mph WAB Group mentions the award of gales. a Certificate of Merit to Leroy Dale. He caught the tail-end of the ZS6XJ (KG33) for his outstanding Perseids and completed with 13 50MHz achievements. He has won stations between the 11th and 13th, numerous awards for the band and has probably worked most of the all but one on the random SSB 1"" "›... • European DX-chasers on 50MHz. frequency of 144-200MHz. (I to r) Roger, G3OHH, Allan, GM4ZUK and local resident Frank getting the gear Countries worked were D, G. I, OE, from the pier on Foula. The new and fully revised Fourth

20 RADIO COMMUNICATION October 1989 SPECTRU M ANALYS1

Series WAB Book is now available "is hopeful of receiving a permit. from G4KSQ for £7.00, including ANNUAL VHF/UHF TABLE according to Hal Lund, ZS6WB." January to December 1989 postage. Byron Fletcher, G6HCV (SFD), 50MHz TOMHz 144I/Hz 430MHz 1.3GHz Total used MS to work the Foula CallsIgn Cty Ctr Cty Ctr Cty Ctr Cty Ctr Cty Ctr Points CONTEST NOTE G1SWH 68 26 64 6 90 19 51 6 - - 330 expedition, GMOFRT/P, on 12 August, completing in a single two- The forthcoming RSGB contests G8LHT 58 16 19 4 89 26 45 14 7 4 282 G6HKM 59 29 - - 73 27 39 14 23 7 271 minute burst. He enters the table are listed elsewhere, but the WAB GOIMG 66 24 39 5 51 10 27 5 - - 227 with 143 'legal' squares. Ian Group is holding its 50MHz Phone G4XEN 24 9 23 4 76 31 39 11 217 Harwood, G8LHT (YSS), found event on 8 October from 0900 to G4P10 - - - - 81 34 41 20 176 G1DOX 26 3 33 6 57 13 20 3 2 1 164 PA3DYY/MM in JNO1 on 27 July. 1200GMT. Copies of the rules are G8PYP 33 21 - - 50 25 23 10 162 On 8 August he worked 9H5AB and available from G6TNW, GM1SZF 41 11 - - 71 16 7 8 152 TK/PAOERA, and the next day, Cornerways. Orchard Road, St GM4CXP 28 11 4 1 60 19 4 3 129 F5NS and FC1GHX, neither of Neots, Huntingdon. Cambs.. PE19 G8XTJ 40 14 - - 54 13 - - 121 GOEVT 24 19 - - 39 26 6 6 120 whom are on the list of French 3AN. Send a 9x4 inch SASE. plus G3FPK - - 74 24 - - sa permit holders. three first class stamps if you also GW4FRX 65 32 97 Ela Martyr. G6HKM (ESX). has want logsheets. G4OUT 27 5 41 18 91 GJ6TMM 28 12 23 9 1 4 77 made the magic 'ton' thanks to G7CLY - - 54 14 4 1 73 FC1JBA (JN15) on 6 August. Prior METEOR SCATTER G4TCK - - 44 44 sa to that she worked LUs 9AEA and The next significant meteor shower GMOJOL - - - - 43 11 54 GOHDZ - - - - 38 7 - - - - 45 2E10 and CX4HS on 27 July: Z23J0 is the Orionids. which - like the Eta GM1ZVJ 4 3 - - 22 11 - - - - 40 on 2 August. followed by ZS6WB. Aquarids in May - are associated Do not include El countries. British countries are the 79 listed in the January RadCom. 9H5s BN, AB and O. She caught the with comet Halley. The Right Up to three different stations allowed in all 12 GM regions. Countries are the usual aurora on the 17th but only worked DXCC ones. Ascension is 95°, the Declination GMOGEI (1077). LU6DLB (GF05) 16° and at its peak, which should was contacted on the 19th. while be on 21 October. the ZHR is 30-40. 23rd; LUs 8MBL (FF57), 2E10 and completions with El8EF (1054) and auroral Es brought QS0s with The radiant is above the mid-UK 9AEA (GF05) and CX4HS on the GM3WOJ (1077) and in the evening OH6RJ (KP22) and SM2CEW horizon between 2100 and 1200. 27th; 9Hs on the 29th with ZS3VHF GMOFRT/P, GMOHSC and (KP15) later that evening. Prime times for the usual at Sfl at 2035 on the 30th on an GM4WJA were further SSB MS Steve Damon, G8PYP (DOR) directions are; NE/SW around 0230, otherwise empty band. August QS0s. worked a rare 'local' on 23 July. G/ E/W around 0430. NW/SE around brought ZS6, Z2, 9H and EA7 cross- Gerry School, G1SWH (LNH), PA3AUC/P (IN79). F2LO/P (IN88) 0700 and N/S. two equal peaks band on the 2nd; ZB. TK and F on caught the South America opening was contacted on the 28th but is around 0100 and 0800. If the prime the 6th; SV10E (KM17) on the 10th. on 23 July working CX4HS, another apparently self-licensed time coincides with the actual peak, while OH9NLO and LA9BM were LU6DLB and LU1DMA (GF05) and station. Es accounted for PA3DYY/ results should be quite good. There contacted via auroral Es on the CX8BE (GF15). John Hunter. MM (JNO1) on 2 August. 9H5BN on are several other minor showers in 21st. G3IMV (BKS) worked much of the the 8th and CT1XY (IN51) on the this period which could provide Bob Nixon. G1KDF (LNH) heard DX that was around, such as CX, 14th. John Fitzgerald, G8XTJ (BKS) additional reflections. Incidentally, Z2 and ZS3 on the 27th with CX. LU LU, Z2. ZD8. ZS3. ZS6. etc. He logged GMs 4DGT and 3YOR on the worst times for any particular and TX worked. GMOFRT/P (IP80/ remarks that it is not too easy to gel CW in the 17 August aurora and direction coincide with the prime Foula) was worked on 12 August through the monumental pile-ups confesses. "Wish I had the guts to times for the direction at right using MS procedure and GMs were from G and PA. use the key." Well, why not have a angles. For example, the worst N/S contacted in the aurora on the 17th. G4IJE reports many openings to go? We all had to start sometime! time is 0430. which is the prime 9H4W on Gozo (JM76) was an CT. F. OH and 9H. On 23 July Paul It was a pleasure to hear from time for the E/W path. interesting OSO on the 18th. LA. heard CXs and LUs but couldn't George Ripley. GD3AHV. who I first OH and SM were worked on the crack the huge pile-ups. At 1841 on worked 30 years ago when he was 50MHz 21st and many GMs heard in the the 27th he contacted his second VQ2WR in Northern Rhodesia. He Ray Cracknell. G2AHU (HWR), has aurora on the 23rd. He caught the ever Argentine station, LU2E10; worked CX4HS on 7 July for the forwarded his comprehensive July South America opening the next then patience was rewarded at 1855 first GD/CX contact and Z23J0 for report and remarks on the very day, working three LUs in GF05 and when he worked CX4HS for country the first GD/Z2 OSO on the 27th. short solstice 'closed season' for CX4HS between 2010 and 2100. number 47. On the 31st. Z23J0 was Other notable QS0s were EA8/ TEP which only lasted from mid- From 2115 to 2150 he copied no48 at 1745. ZS6s were worked on G3JVL on 8 July, SV101-1 on the June to mid-July. Beacon and PY2SB, PY2DM (GG66) and 2 August. Paul thought activity in 14th and three LUs on the 23rd. He amateur signal reception in Britain PY2GWH who was S3 for 30 the Perseids shower was lair but no also mentions assorted CT, F. LA shows that ZB2VHF was heard for minutes: Bob didn't hear him work F, LA. 01-tor Stvl stations were and OH activity. 90% of the month; CTOWW and CT/ anyone. though. heard on 50-350MHz, which is the Geoff Brown. GJ4ICD, claims the EA amateurs 61%; 9H1SIX and 9H Andy. GM4IPK (SLD) worked designated random MS frequency. first GJ/Z2 OSO at 1646 on 23 July. amateurs 55%; LA, OH, SM 29%; F, ZS3KC (JG77) on the 9th and heard The shower produced bursts up to LAs were around at 1740, followed I. T77 65%; DL, HB9, 0E, OZ, PA ZS3VHF between 1715 and 1805. three minutes duration from by CXs and LUs from 1800 until 23% and 5B4CY 29%. He said that there were also some GMOFRT/P and the GM3RMK 1928 when he went OAT. Z23J0 From Greece, SV1DH records 18 Es to the south coast of France at beacon. was up to 40dB over S9 from 1700 and 19 July as the only poor days. the same time. On the 21st there Ted Collins. G4UPS (DVN), sent on the 28th. Many ZSs were on The new TEP season started on the was an Auroral Es opening to PA. G in the usual comprehensive report from 1600 on 2 August, plus several 21st. but there was TEP and SM6 and Andy also heard an covering the period to 14 August, LUs from about 1900 to 1930. On propagation on 48M Hz from Z2 on OZ on 50MHz, together with a and he worked and heard all the the 12th, he had tropo !DSOs with 48% of the days. Once again France baffled-sounding Russian non- European and African DX reported GB2XR and GMOEWX. fared best in the Es stakes at 68%. amateur station on 50.200! The above. In his information sheet, Ted Like many others. Geoff is followed by PA 52%, 9H 42%, ZB2 band opened from him to CX4 on records: that LX1S1 promised to getting fed up with those who use 39% and G 35%. the 23rd but no QS0s took place. telephone him as soon as the LXs the inter-continental DX calling Mike Gotch, GOIMG (ESX). Darryl Green. GI PBU (SAY), was received their permits; that the frequency, 50.110MHz. for working added GD. SV and TK to his score away in the second half of July. 6 Belgian PTT has agreed to 50MHz locals and rag-chewing. He cites since his last report. Dick Hyde. August brought SVI OE at 1710, operation; that with the ending of GM6RGN working Gs and Fs via Es. GOLFF (SXW), lists some choice DX then TK/PAOERA and some Fs. Channel El TV in Spain. several French stations have no authority to including LA and OH on 22 July, 9H5s BN and BW were contacted in EAs have applied for permits; that be there anyway. since their permits Z23J0 (KH52), CX4HS (GF17), his lunch break on the 8th. MS on GM4DGT has moved to 1086DC in are for 50.200-51.200MHz only! FM5CW and PA3DYY/MM on the the morning of the 12th saw Clackmannanshire and that ZC4MK PLEASE stick to the band plan

RADIO COMMUNICATION October 1989 21 SPECTRU M ANALYSIS which can be found in the RSGB John caught the early morning Es Call Book. G4UPS and 1 have it on LOCATOR SQUARES TABLE to Italy on 22 July but best DX came Starting date: 1-1-1979 disk, so if anyone wants a copy later, to U050IW (KN46KX). Shift 50MHz 144MHz 430MHz 1.3GHz Total printed off an SASE to either of us CailsIgn work resulted in his missing the G6DER 43 183 114 82 422 will get it to you. GJ4ICD 215 263 119 59 656 best of the Perseids, but when he At a recent meeting of the VHF G8ATK 143 94 52 289 did listen the bursts didn't seem Committee, we discussed the band G4RGK 284 126 51 461 very long. G3IMV 91 427 124 48 690 Mark Holloway. G4YRY (DOR). plan and endorsed the idea that G6HKM 102 215 107 45 469 50.200MHz be designated a 'dead G1KDF 139 180 102 37 458 runs an FT-290. 80W amplifier and band calling frequency'. This was G4MUT 82 153 93 31 359 two 14-element Vagis. He worked 175 10 proposed to try to prevent the G8LHT 72 88 345 Italians in the 0 and 2-5 call areas in G4VXE 147 162 42 4 355 problems caused by the 'call and G1DOX 33 61 11 3 108 the 22 July Es between 0723 and OSY' technique when the band is G4IJE 225 338 5 2 570 0737 and heard I4XCC at 0830. busy. G4KUX 384 120 504 G6HKM worked GWOKZG/MM in G4XEN 66 290 111 467 J014, 15, 24. 25 and 35 for five new Michael Thomson, GM4JEJ G6IiCV 143 229 372 (TYS), has heard quite a lot of DX G4RRA 277 80 357 North Sea squares. Ela monitored from F. OH, CX. ZS, ZB, etc. but G4SSO 251 95 346 the random SSB MS frequency on 342 wrote in his letter of 27 July, "Still G4P10 256 86 12 August and found it most GM4YXI 340 340 interesting, so she might be no auroras or openings to the USA. G4SWX 333 333 Perhaps you could explain why, GOCUZ 327 327 tempted to have a go sometime. In with so much solar activity, there is 6401-IF 325 325 the 17 August aurora she worked GOEVT 58 197 57 312 GB4XS and GM4DHF/P, and a lack of auroral activity?" The G1SWH 97 123 53 273 general trend is for there to be GJ6TMM 62 151 47 260 worked David again on the 20th fewer auroras in the summer G3FPK 240 240 when he was in 1076. months and for auroral activity to GOLFF 83 153 236 Perseids successes on SSB for GM4CXP 198 31 229 peak 12 to 18 months after the GW4FRX 226 226 G6HCV were GM4CAN/P on 11 sunspot peak. GM41PK has G4DOL 213 213 August, Y22IC (J063) on the 12th reported numerous events from G8PYP 68 98 21 187 and LA9ZV (J059) on the 13th - all G8XTJ 38 116 154 completed within four minutes. Shetland since Michael's letter, so I G4XBF 150 150 hope that GM4JEJ has now made G4TGK 136 138 IW5BML (JN52) was the only some auroral QS0s, perhaps during GOJHC 117 117 station heard in the Es opening on 103 the 14-18 August period. GMOGDL 81 22 22 July at G8LHT. Between the 24th G1WPF 101 101 GMOGEI 94 sa and 31st. Ian had QS0s with GWOKZG/MM in J005, 12. 13 and TOMHz GOHDZ 64 64 GWEN 48 48 15 for four more squares. Other Ray Parrish, GODMV (CHS). reports G7CLY 38 1 39 QS0s of note were with GM3P01/P GM1ZVJ 5 33 38 that there are about eleven stations (OKE) on the 29th, GM3ZME/P No satellite, repeater or packet radio OSOs. 'Band of the month' 1.3GHz_ QRV on FM in the Macclesfield (SCD) on 3 August and GM4ZAP/P area. Most use Pye Westminsters on (WIL) on the 7th. 70.45MHz, though some have aurora on 10 August was GM4IPK the 12th; although 150 seconds GJ4ICD missed the peak of the 70.26MHz as well. There is usually (1099) but the one on the 16th was long, they didn't complete. Four Perseids. Geoff sat on 144.200MHz some nightly activity on 70.45MHz. better. yielding SM5CBN (J078), new squares were TK4MS, from 1300 on 12 August to 0600 the The only other reader to mention GM4DHF/P and GMOJOL (1078) SP6ASD/8 (K010). SP6AZT/8 following morning and claims 70MHz is G1SWH who worked and SM4KYN (J079) between 0040 (KN19) and OH1AY0 (KP12). John QS0s with OK3BIL, YU3ZV, El9FK/P (1051) on 9 August and and 0108. The event faded away by has worked GWOKZG/MM in YU3ZW (who was S9 plus for three again in 1054 on the 24th. On the 0140. several wet squares and thinks minutes), YU2KK, YU3DDC, 21st he found GM4ZAP/P (1064) for Best in the Perseids were Andy is to be congratulated for his IK5EHN,IK5EHW,IW5AVM, I3FDX, a welcome Western Isles OSO. LA6HUTF (IP14) on 6 August and efforts. His 1990 provisional 0E3AP, I5JUX, I4XCC, IN3TWX, in IP25 on the 10th, TK4MS (JN42) schedule has been published YU2EZA and IK3EVN. 144MHz on the 10th, and on the 12th CT/ showing more North Sea operation John Lincoln, GMOJOL (HLD), Andrzej Kaleta, SP6GVU (J081LC). F1DDA (IM59) on SSB, EA3BEW/7 from the Challenger, plus some operated in the auroras on 15, 17 worked some fine DX in the Es (IM77) and OH2AUK (K019). Colin from the Atlantic. west of Scotland. and 21 August. working the usual opening on 21 July. using an IC- completed seven other QS0s, but Peter Atkins, G4DOL (DOR) Europeans and UK countries. 202S, 30W amplifier and 17-element thought the shower not as good as worked three lOs via Es on 6 August Notable contacts on the 15/16th Tonna Vagi. Between 1356 and in 1988. The peak was 0600-0800 on from 1756 and a couple of EA7s were GWOKZG/MM (J005), G4CVI 1628 he lists 20 QS0s with Russian the 12th, as he had calculated by around 2005 on the 11th. He (1090) and DJ9UX (J041); on the stations, seven of them over adding six hours to the previous thoroughly enjoyed random SSB 17th 0Y6FRA and on the 21st 1900km. Best DX were UV4HN year's peak time. operation in the Perseids on 12 OZ6OL (J065). One gotaway was (L043), UA4CFV and UA4CAJ GOLFF worked two 1W0s via Es August, completing with YU3AN, GB2XS, all of 60km away yet never (L032), UA4API (L020), UW6HN on July 22, while MS brought FC1JG,18KPV twice, 0E3OBC, worked on tropo. (LN04), UA4FFD (L033) and IW1AZJ (JN35) and GM4CAN/P IW5AVM, EA6FB (completed in a Keith Kerr, GM4YX1 (DGL) has RA6AX/UA6YP (LN03). Most (IP80) on 12 August. G1KDF claims 30-second burst at 1155), EA6VQ, been one of the most reliable signals were S9 plus 20dB. At 1342, random SSB MS QS0s with EA3ADW and 0E3NFC. At 0712 on signals from north of the Border for SP6ASD and SP6AZT (J081) 0E3JPC (JN88), 1K3CBU. DJ7KL the 13th he worked I2FHW (JN44) years. He has been busy moving his worked UG6AD (LN2OFE). and IOUZF (JN63) on 12 August. on tropo. At 1752 on the 21st, goods and chattels to Aberdeen Colin Morris, GOCUZ (WMD). Auroral 0S0s on the 17th were with GMOEWX (I067UL) was the only and hopes to be fully QRV from used four modes to bring his GB2XS and GM4DHF/P and on the station worked in an aurora. there before the end of the year. He squares tally to 327. Es on 22 July 23rd with GM6RGN (SLD). Bob It took John Palfrey, G4XEN managed to catch the Perseids as brought Italians between 0716 and operated portable from 1083P0 in (NHM) 37 minutes to work GB4XT his swan-song from Gretna, and 0826. a gotaway being IA5PLB the Low Power Contest on 5 on MS on 18 July and he wonders generally found reflections quite (JN52) on Elba. Tropo on 31 July August, his 182 QS0s and 65 what region North Rona is in? My good, particularly on 12 August. provided GWOKZG/MM in J015 multipliers bringing 82940 points. guess would be Orkney but don't New squares included LA6HL/TF and J005, and on 10 August at 2330 G3IMV thought the Perseids take that as gospel (Our (IP25). TK4MS, LA/DF9PY/P EA1TA and EA1ACD (IN53) who quite good. The longest burst was Bartholomew Gazetteer of Britain (JP78). SM6CMU/2 (JP96), were S9. The only activity in an from HG1S in the early evening of puts it in the Western Isles - Ed). SM6CMU/3 (JP62), UR1RWE

22 RADIO COMMUNICATION October 1989 SPECTRU M ANALYSIS

(K038) and YUlADN (KNO3) all on January 1990RadCom - Christmas TROP O AND AUR ORAS: direction is very, very small, so the CW. and CT/F1DDA (IM59) and and all that A CONNECTION? wavefront proceeds coherently OH1AYQ (KP12) on SSB. (with the same phase) and hence Andy, GM4IPK, now has his In the June VHF/UHF column I the many scatters reinforce each LDF-5 feeder and is working on SWL included some observations on VHF other. This is not true for large getting the 4 X 15-element Cue propagation by John Eden, angle scatters, where phase BOB TREACHER BRS32525 Dees up on the tower. With a single GMOEXN (HLD), who wondered incoherence produces the antenna he worked EA2s LY (IN80). October traditionally marks the whether there could be a frequency warble heard on tropo CW (IN83), LU (IN92) and AGZ start of the HF DX season, where connection between solar activity backscatter signals. Remember that (IN91). and at 1821 Andy had a we move away from short-skip and tropo propagation. He has phase modulation is equivalent to 0S0 with EB1ARV in IN70. The summer conditions into the since written to say that "all the frequency modulation. Spanish station was working into expeditions and contests which repeaters in the Borders region and "The amount of forward scatter East Germany at the time and Andy herald the beginning of the 'New northeast of England are detectable obviously depends critically on the had to beam at Y22 to make the Season'. This year, as we head for again on a regular basis." He also size and frequency of the contact. Andy commented that he the peak of the current sunspot feels there is a "connection irregularities in the atmosphere. saw his best-ever display of cycle, we can expect some very between certain particle input from and it is this which gives the day-to- noctilucent cloud on the same good conditions - especially on 21 the sun, or magnetic or electrical day variations of conditions when evening. He listed auroras on the and 28MHz The experts are also field effect influence, on what we there are no abnormal openings. It 10th, 15th, 16th, 17th, 18th, 19th predicting great things for 50MHz, call tropospheric propagation." is the size of these irregularities and 21st of August. On the 22nd with a good deal of F2 propagation Geoff Grayer, G3NAQ (BRK). is which gives the differences Andy worked SM2CEW (KP15) via to look forward to. Will we hear any a member of the Society's between the bands: after all, the EME with his single Vagi and 350 activity from the Pacific? Only time Propagation Studies Committee refractive index of air is not watts al the feed point. Signals were will tell, although there should be and has sent a two page mini- frequency-dependent at VHF/UHF good enough for rebroadcasting on plenty of 50MHz DX on offer from treatise on tropo matters. He begins wavelengths. Rain is very effective the 14MHz VHF Net! the Caribbean. by stating that normal long distance at equalizing the conditions With all the increased activity contacts (several hundred throughout the lower atmosphere, 430MHz which winter conditions should kilometres) on 144MHz, which we which explains why it generally GOCUZ reports the "only bring about. I look forward to lots attribute to 'tropo' are not the result depresses tropo-scattter more reports from readers which of smoothly refracted rays such as propagation. interesting thing worked for a long time was GM3ZME/P on Tiree on 4 can be used to form this portion of illustrated in all the text books with "So where is the connection with my monthly offering. However, let's the caption, 'Super refraction'. For aurora? Well, tropospheric August." (How about a squares look back now over what happened that to happen, the refractive index irregularities are not the only entry for this band. Colin?) G1KDF took part in the Low Power Contest in August. would have to be just the right value source of forward scatter. over the whole path to follow the Ionospheric irregularities can also on 6 August and made 50 contacts with 39 multipliers for a score of curvature of Earth. He suggests perform the same function. HF REP ORT 13104 points from the home 0TH. "this would be an astonishing Normally, these are far too small to We start with a report from Malcolm coincidence if it ever happened. be effective for any but extremely Apart from that, activity seems to Harrington, BRS20249. Malcolm's Under these conditions signals high-ERP stations. However, have been nil. G1SWH lists GB4XT radio activity has to fit in with his would suffer only free space auroral particles precipitated before (OKE) on 15 July and G8DDY/P (IOW) on 6 August as recent new shift pattern, and when he wrote he attenuation, i.e. they would be very a full aurora develops cause was finding that his 'late shift' strong." enhanced ionization on the HF ones for the table. Highlight of the month for allowed him an hour at the rig Long distance, high level signals bands, prior to the adverse effects G6HKM was working GU3EJL between 0630 and 0730. Nice result from ducting when the waves of D-layer absorption and magnetic (ALD). Both Ela and G8LHT results, too, judging by the are guided between layers which disruption of the layers." information provided in his letter. follow Earth's curvature. So what of Geoff concludes, "This auroral commented adversely on the RSGB's choice of the day of the Some good loggings included J797 these regular, middle distance precipitation and magnetic Woburn Rally for the Low Power on 28MHz CW and FO5JR on contacts we regularly make? Geoff disturbance could well create 21MHz CW, and JT9C was noted on says. "Beyond the relatively short sufficient irregularities in the lower Contest: "A fine piece of planning" 14 and 21MHz SSB. Malcolm also refraction zone (the line-of-sight ionosphere (D and E-layers) for as Ian commented. Did any readers accounted for KH6IJ, V31BB, plus one-third hypothesis) signals ionospheric scattering to become submit an entry for the August P29CG and HH2Z on 14MHz SSB. proceed by a combination of an effective propagation mode. This Activity Contest? If not, just what all in the space of 15 minutes. diffraction over ground-based - rather than tropospheric can we do to generate more activity Brad Bradbury, BRS1066, obstacles and by forward scattering - may be the mechanism on the band? apologized for missing a couple of tropospheric scatter. The refractive noted by your correspondents." He months. He hasn't been too active index of the atmosphere changes mentions that support for this THE MICR O WAVES but did come across two new continuously from point-to-point conclusion comes from a paper, No microwave activity news this Oblasts - 02 and 174 - making a due to differences in the Simultaneous VHF Riometer and month apart from G6HKM. who total of 180 heard so far; 161 have temperature, density and - most Forward Scatter Observations by L reports only one 1.3GHz ()SO in been confirmed. Also in the log important - humidity. So the A Maynard. August. "and that was a struggle during August were XU1SS on wavefront is continuously Geoff corrects a statement by with PEIEWR on the 8th." Perhaps 14MHz CW (for country number undergoing small changes in Charlie Newton, G2FKZ, in the July the September Activity Contest and 302). CYODXX (Sable Is) on 21MHz direction, and hence spreads out. VHF/UHF that noctilucent clouds the forthcoming Cumulatives might CW, LU1ZA (South Orkney) on "For this reason, t believe the are around 40km high, which would persuade people to actually 28M Hz CW and STOSA. Brad notes model of tropospheric scatter be within the D-layer. Their altitude operate! that the Russians are now mounting normally adopted - of relatively is around 82km and as Geoff says. many internal DXpeditions to rarer large angle scatters arising from a "The amount of energy carried by DEADLINES parts of the USSR. small common volume (Ref. J N auroral particles is very great Some contributors are still sending On the question of rare Oblasts. Gannaway: 'Tropospheric scatter indeed; an estimated one million in reports too late. We all work to a Stan Williams. G3LOI. wrote on the propagation' RadCom, August Amps flowing along the auroral very tight schedule to make subject of Arthur Miller's comments 1981, pp 710-714) - does not curtain al E-layer height. Hence it is Spectrum Analysis as topical as concerning lack of activity from represent the true situation except, hardly surprising that enough possible, so please make sure you UA8T. Stan has been licensed since perhaps, where there is a massive heating results to evaporate these get your input to me by 21 October 1955 and had never heard one until obstacle in the path. Most very tenuous clouds formed of ice- for the December issue and by the 0803 on 21 July this year, when important, each deviation of coated meteoric debris." early date of 11 November for the RZ8T/UA4FDS appeared; he was

RADIO COMMUNICATION October 1989 23 SPECTRU M ANALYSIS

599 and had a mega-monster pile- appearance. Other highlights good day, with SM6PU (J067) June. In the Perseids Mick copied up. Stan hoped that Arthur was included VP8BWT, ZD7VC, ZD8PJ, heard at 0608 on 50M HZ. Between good bursts from UR1RWX (K029), listening at the time and crossed 5H3TW and 6Z2E (Liberia). 1246 and 1423 Martin logged a EA6FB (JM19). OH2AUK, EA7AJ/P. him off the 'wanted' list with a Pick of the HF news from David variety of OH stations in KP01, 11, SP6AZT/8 and HBO/HB900 in flourish. If anyone needs it. the OSL Whitaker. BRS25429, was that he 20, 24 and 26. On the 23rd he JN47. route is Box 555. Penza 44061, had heard 9M6HF and 9M8STA on caught CX4HS (GF17), CX8BE Here in London. VHF has been USSR. 14MHz. Like Robert Small, David (GF15), LU2E10. LU1DMA and quite poor. On 50tv1Hz, CX4HS was Next, a report from Robert Small, found 28MHz poor, with only LU6DLB (all GF05). On 144MHz logged on 23 and 27 July. PA3DYY BRS8841. Robert felt that TJ1MW. A92BE. BY4AY and 8Q7AC Martin noted six Italians between was /MM in JN12 on 23 July and in midsummer conditions had been heard during the entire month. 0717 and 0726 on an unspecified JNO0 on 2 August. Some LUs were quite good, especially on 21MHz Finally, a quick look at 18 and date. heard around 1900 on 27 July. where there were many openings to 24MHz. David Whitaker sent a Up in Harrogate, David Whitaker ZS6WB and LU7DZ were heard on the Pacific. 28MHz was detailed report of his findings on had no success with the Perseids - 2 August, whilst Z23J0, ZS3E and disappointing, however As usual 18MHz. As of 15 August he had he says he doesn't have the the tail-end of a CO from '...B' at for Robert, most DX was on 14MHz heard 87 countries including patience! On 50MHz he mentioned 1726 were heard on 5 August. I during early-morning or late- 9M2RI, YN3CB, VP9LP. J6LPS 23 July as being a good day, thought at first that it might have evening hours; nothing much was (QSL via W2GBX), HP3FL, YB6LD, hearing LUBYY0, LU4DMX. been 7X5AB but it seems that heard during the middle of the day. CEO1CD, VP2VM, C6ARC, HH2MC, LU9AEA. LU1DMA, LU3DMA, ZD8MB was on the band that night. Highlights were CEONKY (Easter FR5EL. HC5K. T3210, 8P9FU and LU6DLE3. CX4HS and CX8BE. David so it may have been him. SV10E Is), FP/KU2W, ZF2BD, YN3RD, ZD8JW. On 24MHz Robert Small heard ZS3E on the 27th. ZS6LN (KM17) and SV1AB (KM18) were FP89DX. BY4AY, T5YD. ZYOTI, mentioned AL7I, HC1HC, HK7/ (KG46) on 2 August and Z23J0 on logged about 1720 on 6 August. ZD8XX and JT1BR. Here's the best SM5HV. HZ1AB and VP2EHF 5 August. On the European scene In the Perseids. two new ones of Robert's list of 21MHz DX - (direct QSLs only). David logged some Frenchmen. were heard on 70M Hz - GM3WOJ KH6LW/KH7. 3D2AK. T32P0. OSL cards reported from a PA3DYY/MM in JNO0 and TK/ (1077) and El9FK/P (1043). On 144 JH1MAO/JD1 (Ogasawara Is). number of sources included PAOERA in JN41 MHz, OH5LK (KP30) and 0Y6FRA FO5MC, KH6IMB, 3D2XV (Rotuma BY5NC, KC6VW. DK10E/KH8, Mick Toms, BRS31976, actually (1P61) were new. Elsewhere, there Is) and FW/N7HAT, all in the VP8BUB, ZXOF, 3COA, 3B1DB, mentioned some tropo on both 144 were plenty of bursts from the Pacific, together with CM2AW/4 3D2CR, 3W0A. 3W8DX, 5V7WD and and 430MHz - a rare event these 'regulars' in the course of the year's (Isle of Pines), YB9ZDA (first YB 9X5AA. days - although he added that he best MS event. Stations identified active from East Timor), DUSC0/ hadn't been at the rig at the right included 1C8C0F, IW5BML. TF7 (Westman Is) and 3D2SI time. Mick had more success at YU1WP. YU2CAU, 15JUX.11G5PT, VHF REP ORT (Conway Reef). On 28MHz Robert finding GWOKZG/MM than your YU1AFS, IK4DCO, SK3LH, YU3C. logged ZYOTX and CYODXX for new Martin Parry, BRS52543. sent in a scribe did and heard him in J012. HG8CE. YU3AN and YU1LR. ones. On an otherwise dead band brief update before leaving for a 13. 25, 34 and 35. On 430MHz some That's it for this month - keep one morning, KH6JJK put in an holiday in the sun. 22 July was a Scandinavians were logged on 19 those reports coming! e BUY THE BEST BUY N

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ON BRING & BUY FRIDAY & STAR RAFFLE Admission—ADULTS £1 SATURDAY Concessions for Children and 0.A.P.s OCTOBER 27th & 28th 10.00 am 6.00 pm

Enquiries to Frank G4PDZ on 0533 553293 KEN WOOD amateur radio equipment When only the best will do

Le roi est mort. Vive le roil We have always felt it a privilege to be the sole appointed distributor for Kenwood in the UK, but never more so than right now when we see the introduction of a major new HF transceiver from them. The TS-950S continues Kenwood's policy of introducing new models only when there are significant improvements which can be brought to the end user, and this is demonstrated by the long product life of the Kenwood transceivers in the past. In the belief that a picture can tell you more than acres of text, we thought that you would appreciate a big 'un. This is the biggest we could manage... For more information on the TS-950S and its likely delivery schedule, contact your approved Kenwood dealer soon. MC-6 OA LOWE ELECTRONICS LTD Chesterfield Road. Matlock. Derbyshire DE4 5LE Telephone 0629 580800 (4 lines) Fax 580020 Telex :377482 Shops in GLASGO W Telephone 041-945 2626. DARLINGTON Telephone 0325 486121. CAMBRIDGE Telephone 0223 311230,

26 RADIO COMMUNICATION October 1989 25 years in amateur radio

DUAL FREOUE NC Y RECEIVE

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SW-2100

SP-950 TS-950S SM-230

All branch'. «uy closyd .111 day Montliw S. WALES (BARRY) Telephone 0446 721304, LONDON Telephone 01.429 3256 BOURNEMOUTH Telephone 0202 577760

RADIO COMMUNICATION October 1989 27 The NEW (MIN

The OMNI V is a Paragon with a 12 band increments. Up/Down buttons tune in 10 kHz or 50 even further reduces the impact of adjacent strong crystal mixed local oscillator in place of the kHz increments. signals. Most impressive! general coverage synthesized oscillator. The result An auxiliary frequency tuning system is If you do not need a general coverage is receiver cleanliness like the legendary Corsair available and plugs into the rear panel. This allows receiver in your HF rig, the elegant OMM V is a and Omni series. The OMNI V local oscillator is a you to remotely tune the frequency from the most great choice. If you are also a serious OX-er new ultra low noise 5.0 to 5.5 MHz PLL design. convenient and comfortable position. It takes and/or contester, the OMNI V is the best choice. Phase noise is simply eliminated as a significant about 10 ms to fall in love with this option. variable. Dynamic range is maintained right up to A noise blanker and audio speech processor GENERAL SPECIFICATIONS the edges of the crystal filters, even under the are standard equipment as is the cw sidetone and Frequency Range: Transmit and receive on all most adverse conditions. speech monitor. The rear panel has a full ham bands from 160 through 10 meters in their Many of the nifty features made possible by complement of inputs, outputs and controls for entirety. Twelve 500 kHz segments plus 30 kHz digital technology are included. Dual VFO's with A- the convenience of the all-mode operator, over-shoot at the upper and lower edges of the B-split select, the frequency stability of a PLI, 25 including an auxiliary AX antenna input. High segments. tuneable memories, VFO to MEM, MEM to VFO speed key lines are provided for OSK control of a Frequency Control: LO generated from a crystal and the SCRATCHPAD feature. RS-232 interface is fast switching amplifier, such as the TITAN or oscillator mixed with a low noise 5.0 - 5.5 MHz standard and includes remote band switching for HERCULES II. Changeover in fast OSK is less than phase locked loop. the HERCULES II amplifier. The memories are 30 ms, great for CW and the digital modes. Frequency Stability: Worst case, 1 PPM per nonvolatile RAM and are retained until you change The front panel is spacious and friendly. The degree C at 29.999 MHz. them. The status registers and clock are backed vacuum fluorescent display uses large, bright. Frequency Accuracy: + -100 Hz @ with a lithium battery (2 year life) so that when the easy to read elements. The frequency display 25 degrees C. rig is powered up, the status is the same as when doubles as the 24 hour clock display when the Antenna Impedance: 50 Ohms, unbalanced. you turned it oft. CLOCK button is pressed. Other elements indicate Printed Circuit Boards: G-10 epoxy glass. The OMNI V operates USB. LSB, fast or slow VFO status and warn when the memories are full. Power Required: Receive = 1.5 A. Transmit = OSK CW and real FSK. FM is optional. All bands All four of the 6.3 MHz I-F crystal filter 20 A. 12-14 Vdc. from 160 through 10 meters are push button positions are push-button selectable, independent Dimensions: HWD 53/4" x 14/34 " x 17", 14.6 x selectable. Each band position covers 500 kHz of mode. A second filter socket is also provided, 27.3 x 43.2 cm. plus 30 kHz over-shoot at the band edges. The in series, behind the standard 2.4 kHz filter in the Net Weight: 16 lbs. 7.25 kg. four 500 kHz segments of the 10 meter band are 9 MHz I-F. This may be used for an optional 2.4 switched automatically as you tune through the kHz, 1.8 kHz, 500 Hz or 250 Hz filter which is TRANSMITTER segment firnits. Tuning is in your choice of 10 Hz selected with the "NARROW" button. This adds Modes: USB and LSB (J3E). CW (A1A), FSK or 50 Hz increments on SSB, CW and FSK. With six or eight poles into the crystal filter network and (F1A). Optional FM (F3E). the FM option, tuning is in 100 Hz or 500 Hz DC Power Input: 200 watts maximum. RF Power Output: ALC stabilized, adjustable from 20 watts to 100 watts (50 Ohm load) with front panel RF OUT control. Microphone Impedance: 200 Ohms to 50k Ohms. Electronics Plc Bias voltage for electret mic is provided in front HRS panel connector. HRS Electronics Plc., Garretts Green Lane, Garretts Green. CW Sidetone: Internally generated with rear panel level and tone adjustments. independent of front Birmingham B33 OUE. Tel: 021 -789 7171 panel audio level control. SSB Generation: 9 MHz. 8 pole crystal ladder Ring 021-789 7171 for your nearest dealer. Ask for Fred Rende!!! filter, balanced modulator. Carrier Suppression: Greater than 60 dB.

28 RADIO COMMUNICATION October 1989 e W N W. » 3 M il V alIATIEtiN Imo«. ,,, A40à4.4.1/1

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Impressive from either end... but it's how we make ends meet that really delivers the difference.

SEE OMNI VAT LEICESTER — STAND 11 — EXHIBITION HALL

Unwanted Sideband Suppression: Greater than Audio Bandpass Filter: 4 pole. variable center Contact your local Ten-Tec dealer for 60 dB at 1.5 kHz AF input. frequency 220 Hz to 1 7 kHz. 35% band width g further details of this truly remarkable Harmonic Emissions: Greater than 45 dB below -6 dB high performance transceiver. Also ask peak power output. Tone Control: Variable 15 dB roll-off @ 5 kHz Third Order intermod Products: -30 dB from two about the rest of the amazing range of tone al 100 watts PEP. PHASE NOISE PERFORMANCE OF THE OMNI V Ten-Tec professional amateur equipment Metering: Switchable forward power, SWR, -127 dBc/Hz g 250 Hz offset from carrier. now available throughout the U.K. collector current or audio processing level on SSB -146 dBc/Hz g 5 kHz offset from carrier. CW Mel: 600 Hz. Call Fred Rendell on 021-789 7171 for FSK Shift: 170 Hz details of your nearest stockist. CA

RECEIVER Modes: LSB, USB. CW and FSK. FM with optional board. Sensitivity: 15 uV for 10 dB signal to noise ratio The DX and Contesters No. 1 at 1.8 kHz bandwidth. With FM option, .3 uV for - -70 choice. 12 dB SINAD at 15 kHz bandwidth. 14 Selectivity: Can you really afford not to have -6dB BY/ -60 dB Shape Factor , I 1 1 one? o 50 IGO Standard 2.4 kHz 24 1.Hr 3 36 kHz I 87 I Opt. 1.8 kHz 1 8 kHz 2 90 kHz I 60:1 OFFSET FROM CARRIER (kHzt Opt. 500 Hz 500 Hz 1 40 kHz 2 801 Opt. 250 Hz 250 Hz 85 kHz 3 40:1 Here is a graph of the phase noise performance of Opt. FM 15 kHz 30.00 kHz 2 00:1 the OMNI V receiver These measurements can Attenuator: -20 dB. only be made under laboratory conditions and. even then. our test equipment is at the limit of its I•F Frequencies: 1st I-F 9 MHz. passband tuning 1-F 6 3 MHz ability to measure the noise at the narrow offsets. Image Rejection: 0-100 dB The significant measurements are those close-in I-F Rejection: >60 dB average Note that this graph does not even go out to 25 Noise Blanker: Switchable on/off with width kHz offset where many of the published Tar adjustment. measurements are made. Certainly, we invite comparison. TE N—TE C Dynamic Range: 97 dB. measured with standard 2.4 kHz filter at 20 kHz spacing. 100 dB + with cw filters Third Order Intercept: + 10 dBm Noise Floor: -133 dBrn 2.4 kHz bandwidth Squelch Sensitivity: Less than 6 uV HRS Electronics Plc Receiver Recovery Time: Less than 30 ms H RS Electronics Plc., Garretts Green Lane. Ga etts Green, Pass Band Tuning I-F Shift: + -2 3 kHz Audio Output: Speaker, 1 5 watts er. 8 Ohms. Birmingham B33 OUE. Tel: 021-789 7171 Fixed level 1 mw g 600 Ohms Notch Filter: 250 Hz to 2.2 kHz, greater than 50 Ring 021-789 7171 for your nearest dealer. Ask for Fred Rende!!! dB notch depth

RADIO COMMUNICATION October 1989 29 I ALO THE LEWES ICOM KEN W OOD

1CR 7000 plus HF Kenwood TS 440s & Auto ATU Our famous HF Mod is now accepted One of the finest HF transceivers ever world wide as an excellent improvement to produced by Kenwood. Whether used as a an already excellent receiver. Frequency base station or mobile — its superb cover from I OOKC to 2GHz specification rates it high amongst its £989 NO W WITH FREE competitors. DISCONE ANTENNA We are making a special exhibition offer at Leicester TS 440 with auto ATU WITH ICO M EQUIPMENT FREE Revex 30amp power supply — at All on special offer list price IC 781 HF £1,282 IC 765 HF IC 735 HF IC 725 HF IC 2SE 2M IC 2SET 2M IC 4SE 70CM IC 4SET 70CM NO W Kenwood TS680 or 140 IC 32E Dual Band WITH These well tested HF IOC 228H FREE Transceivers are now well ALL ITEMS ON MIC established as reliable and easy SPECIAL OFFER to operate, with all the modern features that are demanded by the amateur. TS 140S 100 watts £799 TS 680s with 6m ARE COM MUNICATIONS LTD £929 6 Royal Parade Hanger Lane, Ealing London W54 I ET Tel 01-997 4476 Fax 01-991 2565

30 WE ARE IN OUR USUAL SPOT AT FFERS FOR LEICESTER WITH ALL THE USUAL BARGAINS - Brenda INCLUDING Bernie TER SHO W G4VXL COFFEE! G4A0G DUAL BANDERS A MESSAGE FRO M FOR 2 AND 70 THE GUVN OR HAND HELDS (The one on the right) S Yaesu FT728 Once again, Leicester is just around the Kenwood TH75 corner — and, once again, we intend to Standard C520 E bring to you the best prices at the shows ICOM IC32E whether its part exchange or a straight buy — cheque or HP, Credit Card or a straight DUAL BAND MOBILE swap with the XYL. We will offer you a Kenwood TM731E good deal. Remember we are not just Kenwood TM701E YAESU or ICOM or KEN WOOD dealers, ICOM IC2400 we sell all makes — so we will not try to ICOM IC3210 sell you YAESU when ICOM will suit Standard C5200 10 watt o you better. Yaesu FT4700 See you at Leicester. RECEIVERS B&B JRC 525 HF E IC R 7000 VHF/UHF IC R 71E HF AX700 VHF/UHF S Jupiter B.N.O.S. Uniden LPM 432/1/50 AOR LPM 432/3/50 List less 20% LPM 432/10/50 LPM 432/10/100

YAESU SECOND HAND ACCESSORIES BARGAINS 2 metre BD for 767 Yaesu FT200 HF TCR £250 70 cm BD for 767 Yaesu FTIOIZ HF TCR £350 6m BD for 767 Trio TS900 HF TCR £450 Nicad Batts and accessories for ICOM IC 701 HF TCR £495 FT 209-FT 23R-FT 73R-FT 470-FT 728 Yaesu FT 726 £650 Yaesu Mics Kenwood TS680 £750 MH I 8A2B FRG7700 REC £325 FRG8800 REC £495 MHI 9A2B Many other bargains MD I B8 Alinco UHF Linears MHI B8 1-3 in — 15-25W out £59

RADIO COMMUNICATION October 1989 SINE South Midlands Coi SCHOOL CLOSE, CHANDLERS FORD IND, EST., EASTLEIGH, HANTS. SO5 3811

COMING SOON YAESU FT1000 HF TRANSCEIVER X240 2m to HF TRANSVERTER HX240: 2m to HF Transverter Only Frequency Coverage: 80m, 40m, 20m, 15m. 10m Output power: 30-40W PEP (SSB/C W) £ 2 4 9.00 RF Drive: 2.5W/10W Selectable Rx Preamp Gain: 8-10dB Inc VAT Power Requirement: DC 13.8V, 7A Additional features: Carrier operated switching or by remote

socket, power output meter, switchable preamp 1-1t/Lo output selectable, visual indication of antenna missmatch. ALSO AVAILABLE HX640 for 6m TRANSCEIVERS NEW LOWER PRICES ON TOKYO HY-PO WER Due to increased Volume of Sales we are able to offer better prices on these models HT106 6m SSB/C W TRANSCEIVER SAGRA 600 2m LINEAR AMPLIFIER 25W INPUT PAIR 4CX250B

NOW ONLY £769.00 inc

MULTI BAND V DIPOLE CV730V-1 *High Radiation Efficiency etED *Insensitive to BACK IN STOCK AGAIN ambient conditions \N ALSO AVAILABLE FROM CREATE HF *Compact Size MULTI BAND BEAMS, MONO BAND BEAMS, AND THE Bands — 40, 20, 15, 10m FAMOUS 'CL6' Polarisation — Horizontal SERIES 6M Impedance — 50 Ohms BEAMS VSWR — Less than 1.5:1 Element Length — 5.8m Turning Radius — 4m Weight — 5.1 Kg Great Value at £149.00 inc

EEDS CHESTERFIELD JERSEY BIRMINGHAM AXMINSTER SMC (Northern) SMC (Midlands) SMC (Jersey) SMC (Birmingham) Reg Ward & Co Lid Nowell L411» 102 High Street 1 Belmont Gardens 504 Alum Rock Road 1 Western Parade Industrial Estate New Whittington SL Heller. Jersey Alum Rock West Street Leeds 153 IJE Chesterfield Jersey (05341 77067 Birmingham 86 3HX Axminster Leeds (0532) 350606 Chest. (02461 453340 9-5 pm Non-Sal (021.327) 1497'6313. Devon E013 5NY 9-5.30 Mon-Sat 9.30-5.30 Tues -Sal Closed Wed 9.00-5.00 Tues -Fri Axminster (0297) 34918 Closed Sat afternoon 9.00.4.00 Sal 9-5.20 Tues -Sal

Southampton Showroom open 9 005 00 Monday to Fr+Oay, 9 00-1 00 Saturday Ser.uce Dept open Mon-Fr 9 00-5 00 VISA SOUTH WALES AGENT: JOHN DOYLE, TRANSWORLD COMMS, NEATH (0639) 52374 DAY (0639) 2942 EYE Closed Thursday

32 RADIO COMMUNICATION October 1989 umunications Ltd TEL: 0703 255111 FAX: 0703 263507 TLX: 477351 YAESU

YAESU OFFICIALLY APPOINTED SOLE UK DISTRIBUTOR FT 1000 HF TRANSCEIVER

i IMIlr 11q1 A DYNAMIC NEW HF TRANSCEIVER me one low e FROM YAESU DESIGNED EXCLUSIVELY FOR ELITE WORLD CLASS CONTEST 0 SEE NE W " -6 7121211121 AND DX OPERATORS FT1000 AT LEICESTER COMING SOON FROM YAESU & SMC STAND 8 AND ALL AUTHORISED YAESU DEALERS Sales Hall FANTASTIC PERFOR MANCE, REALISTIC PRICE The FT-7470X is a compact SSIEVCW/AM and (optionally) FM transceiver providing 100 watts of PEP output on all hi amateur bands, and general coverage reception continuously from 100kHz to 30MHz. A front panel mounted loudspeaker and clear, unobstructed display and control layout make this set a real joy to use. Convenient features include operator selectable course and fine tuning steps optimized for each mode, dual (A/8) vfos, along with twenty memory channels which store mode and skip. scan status for auto resume scanning of selectable memories. Eighteen of the memories can also store independent transmit and receive frequencies for easy recall of split-frequency operations. Wideband (6kHz) AM and narrowband (500Hz) CW IF filters are included as standard, along with a clarifier, switchable 20dB receiver attenuator and noise blanker. User programming for more advanced control by an external computer is possible through the CAT (Computer Aided Transceiver)System. The transmitter power amplifier is enclosed in its own diecast aluminium heat-sink chamber inside the tranceiver, with forced-air cooling by an internal fan allowing full power FM and packet. RTTY, SSTV and AMTOR operation when used with a heavy duty power supply. FT747GX HF TRANSCEIVER NEW Yaesu have upgraded this popular HF and VF/UHF base station transceiver. The improved version is now available with enhanced synthesiser performance and VFO tuning rate. Read Chris Lorek's review IMPROVED in "Ham Radio Today".

FT767GX * ALL MODE LSB/USB, CW, FSK, AM & FM OPTIONAL ACCESSORIES: * All BAND Transmit, General Coverage Receive 50/767 6M Unit 10W 0/P £79.00 * Optional VHF/UHF units (6M, 2M & 70cms)* 144/767 2M Unit 10W 0/13 £179.00 430/767 70Cms Unit 10W 0/P f.220.00 * 100% DUTY CYCLE (Key down CW for 30 mins) FL7000 500W PEP HF Linear...£1600.00 * Built in AUTOMATIC ATU (one memory on each band) SP767 External Speaker £69.95 * Computer & Packet radio compatibility FIF232C Computer Interface £75.00

For existing owners of the FT767GX who purchased their sets through Yaesu's official UK distribution network, Yaesu are offering an upgraded local unit for a nominal charge. Please contact us for details.

SMC NORTHERN (LEEDS) CLOSED SATURDAY AFTERNOONS •FREE FINANCE ON SELECTED ITEMS Free interlink delivery on major equipment YAESU DISTRIBUTOR WARRANTY On many regular priced toms SMC otters Free Finance Small 'toms. Plugs. Sockets. etc by post £1.75 Importer warranty on Yaesu Musen products Ably (on invoice balances over £1201 20% down and the Antennas, cables. Wires & larger items. Lynx up lo staffed and equipped Service Department. Daily balance over 6 months or 50% down and the balance £5 Interlink delivery available upon request for contact with the Yaesu. Musen-factory. Tens at over a year. You pay no more than the cash pose! items other than radios from £7.30 depending on thousands of spares and test equipment. ()clads of eligible items avallable on request weight. Same day despatch whenever possible 'Subject to status. PRICES & AVAILABILITY SUBJECT TO CHANGE WITHOUT PRIOR NOTICE

RADIO COMMUNICATION October 1989 33 South Midlands SME Communications Ltd.

COMET & HOKUSHIN ANTENNAS New from Hokushin, an exciting range of high perlormance antennas. the WX1 has been a best seller for some lime now, available are its bigger brothers the WX2 and WX4. Both are multi section 2m/700m connears and the mechanical construction the best we have seen yet On the mobile front a new mini dual bond mobile. the HS-7278S, very similar lo the Comet CHL21J. and tests with our network analyser confirm its compatibility with our existing range of gutter and map mounts. Also available a low profile hatchback mount and cable, the SS-BI. two new dual band antennas, the very slim VM-720SKR and the compact HS-727 VMS Both are suitable replacements for the 70N2M For the HF enthusiasts a compact lOnt 6M BEAMS HB9CV dual driven element antenna that is extremely light and very cleverly New horn Creative Designs are a range el 6M beams. he CE6DX 6 constructed element. C1.6000 7 element and WX2 WX4 HS-1215S 28145.2H8 ROTATORS 01.61)X1 8 element VHF/UHF Base VHF/UHF Base VHF:UHF Metre 10m 2 ele HB9CV All these antennas are the result 01 1441432MEN 144/432MHz 144•432riri Dual driven element the RCS Series el rotators long and continued research to 6/73c1b gain 7 9/10.8db gain 1:4;59 oeie Eidbi gain horn Creative Design are achieve the best possible 200W max 200W max 100W max 500W PEP max built to meet the exacting perlomiance whilst remaining both £75.00 £99.00 £16.95 £65.00 standards required by both cost &reeve and extremely robust professional and amateur M OBILE ANTEN NAS DUAL BAND BASE ANTENNAS CL6DX 5 ele 1300 £115.00 users A range al models 20W 2m 1/2 wave £4.95 WX1 2m;70cm colinear £5-1 99 is available designed to C1.60XX 7 01014 3d8' £168.99 GEM/Xi 8 ele 14 5dfi* 2NE 2m5,/ wave folding £13.25 WX2 2milOcm colineg £75.00 caler tot medium lo large •Alenulaclurers figures shed antennas All the 781 2m 718 wave £15.00 WX4 2m/70cm colinear, high gain £99.00 rotators are manulaclured 78F 2m 7/8 wave folding £2150 CA2X4WX 2re70cm cohnear £79.00 with high quality 88F 2m EVB wave £2410 CA2X4MAX 2m/70cm colinear, high gain £99.95 components allowing 258 70cm 2 x 5/8 .£29.37 CF416MN Duplexer 13-500/400-540MHz £25.50 continued arid reliable 358 70cm 3 4 58 £33.73 HS790DN Duplexer Illess 1 6-150/410-460MHz £25.50 operation 268E 70crn 2 section colinear £32.80 ANTENNA MO UNTS tICS-t £219.00 DU AL BAND MOBILE GCCA GUIter mount and cable £14.25 RC5A-3 £425.00 RC5B-3 £675.00 CHL21J Mini dual band mobile £14.95 HDTMCA SS trunk mount and cable £1950 C048 Rotary bearing CHL23J Small dual nand mole £16.90 SOMM Mag mount and cable 12. £34.95 CA2X4KG 2m 2 4 5/8 70cm 4 x Eli £39.95 TBR SiS hatch back mount NEW ££ 11.275 7014200 2m 6/8 70cm 3 x 5/8 £37.75 RS17 Mini hatch back mount NEW £12.50 HS-727SS Dual band mini antenna NEW £16.95 FISTS Mini gutter mount NEW £12.50 HS727YMS 2m li2 70cm 2 4 5/8 NEW £25.95 SS.F31 Mint Kback mount & cable NEW £26.50 o VIA-7920SKR 2m 1/2 70cm 2 4 5/8 NEW £24.95 CKSLX Cable assembly for RS16. 17. TBR £19.95 \ CARRIAGE BASE ANTENNA (7 50. MOBILE ANTENNAS £4 00. CABLES AND MOUNTS f 3 59)

ROTATORS ÍSTRUMECHVERSATOWER MORSE KEYS

Superb engineering standards combined with pin sharp setting accuracy means new • TAINITOWER MATIO Sedes technology groin 10M10P3030ET POST MOUNTING £482.50 Yaesu create Kenpro 10M/oBP3030E-T BASE PLATE MGUNTING £511.00 toMi0FB3030FT FIXED BASE MOUNTING (475.00 Hygain STANDARD 138120 SERIES 13M20P25251-1 POST MOUNTING £392.50 ROTATORS 13M20P4040FT POST MOUNTING £S36.S0 AR 2 00X L OFFSET TYPE 3 WIRE £38.50 13M20P6060F1 POST MOUNTING £652.00 MORSE KEYS PP G • 25 0 BELL TYPE TWISTISWITCht CONTROL£78.00 13M2OFB2525F1 FIXED BASE MOUNTING £300.00 H0702 STRAIGHT KEY £300 G 490 BELL TYPE METER CONTROLLER £139,00 13/A20E84040El FIXED BASE MOUNTING £448.00 HK 703 STRAIGHT KEY£[4328.49 5 £300 G 400110 BELL TYPE ROUND CONTROLLER £169.00 13M2OFB6060FT FIXED BASE MOUNTING £571.00 110704 STRAIGHT KEY £26.35 £300 G-60ORC BELL TYPE ROUND CONTROLLER £219.00 13M2013P2525FT BASE PLATE MOUNTING £477.50 117705 STRAIGHT £22.49 £.3 00 COIS BELL TYPE METER CONTROLLER £218,90 13M20BP4040FT BASE PLATE MOUNTING £623.50 ell(106 KEY £21.80 £303 HAm V BELL TYPE METER CONTROLLER £327.00 £300 13M2013P6060F1 BASE PLATE MOUNTING £741.00 110707 STRAIGHT KEY £2021.5015 72 X BELL TYPE METER CONTROLLER £449.00 13M20M2525FT MOBILE TOWER £2176.00 110708 STRAIGHT KEY £300 G BOOSDXBELL TYPE 450 DEG VAR SPD £325.00 13M20M4040F1 MOBILE TOWER £2293.00 H0710 STRAIGHT KEY £39.95 £300 G 1000SDXBELL TYPE 450 DEG VAR SPEED £368.00 13M20M606011 MOBILE TOWER £2553.00 140711 STRAIGHT KEY KNEE MOUNTING G ?DUO R CULL TYPE ROUND CONTROLLER £445.00 £4 1.75 R500 ELEVATION METER CONTROLLER £149.95 HEAVY DUTY 161.120 SERIES £300 017100 MECHANICAL BUG £34.95 £.3e3 • 54C 0 AZIATUITTIELEV DUAL CONTROL £279.00 16M20P4040FT POST MOUNTING £803.50 1614201,6060E7 POST MOUNTING M0701 SINGLE LEVER PADDLE £38.35 £300 " 5 r BELL TYPE ROUND CONTROLLER t21900 £911.50 1,10702 SINGLE LEVER PADDLE C(364.2.505 03 Co 7C50 3 BELL TYPE VAR SPEED AND PRESE T£425.00 16M20P8080FT POST MOUNTING £1426.50 T.9(703 SOUEEZE KEY £300 58 • 3 BELL TYPE VAR SPEEDAND PRESO 1E67500 16M20F84040FT FIXED BASE MOUNTING £644.50 16M2OFB6060F1 FIXED BASE mouN TING £763.50 MK 704 SQUEEZE KEY £ .0078 £300 ROTATOR HARDWARE 16M2OFBE34300FT FIXED BASE MOUNTING £1219.02 I.IKTO5 SQUEEZE KEY £3 00 A R20 DA B ALIGNMENT BEARING AR200XL £17.50 £300 1614200P4040FT PLATE MOUNTING £351.00 MK 706 ZEBRKAEYSS KEY - 5505 ROTARY BEARING r 12' MAST £19.95 16M20E1P6060ET BASE PLATE MOUNTING £953.00 110502 DELUXE ££13120«.13 £350 s ,;• ROTARY BEARING 2 MAST' T29.95 11 16M20BP8OttOFT BASE PLATE MOUNTING £1531.00 1117803 DELUXE BRASS KEY £107.75 £350 (16.95 fC Nil C 038 LOWER MAST CLAMP G.490 &CO ele 16M20M4D4OFT MOBILE TOWER £2790.50 .10804 DELUXEBRASS KEY f 99 SS • 23 CHANNEL MASTER BEARING £19.95 16M20M60612FT MOBILE TOWER £2965.50 (34.95 -1.8 ROTARY BEAFIING 15 2 5 MAST i6M20M80130F1 MOBILE TOWER £3681.00 MORSE EQUIPMENT ..OWER MAST CLAMP FiC5 SERIES £25.00 ALL TOWERS EXCEPT MOBILES ARE AVAILABLE FROM STOCK si'100 SQUEEZE 17E VER E109 75 ROTATOR CONTROL CABLE 01/10 AND 131020 SERIES SUPPUED WITH STANDARD WINCHES M WSKEYSID STAR MASI EP 17E VER £54.69 L', 511 ; C50 NWAYG400RC 800 1000SDX PEET MI R£0.48 1641120 SERIES SUPPLIED WITH MOO BREAK WINCHES ALL ARE ::;EWSKES' M STAR MASTERKEY MEMORv £91.99 57 FOC •'•• C50 6 WAY G•250 400600 Pc KR500 PER MT R£0.66 SUPPLIED WITH HEAD UNIT DRILLED TO TAXE GS-065 BEARING :TO MORSE TUTOR f 56 35 •, C0 0 8 WAY HAM1V T7X 200ORC fiC SERIES YODUING DOWN BOLTS Fel BP AND FB TOWERS ARE «LAKE PER 1.11R £0.72 AT Can PER SET EXTRA DATA TERMINAL .K202tFAx. Muir 'MODE DATA TERMINAL£279.95 FOC CARRIAGE ALTERNATIVE WINCHES AND HEAD UNITS ARE AVAILABLE AT ;•TTATORS FREE uOIATOR HARDWARE s2 65 norom:i FAT RA cost' •iAv TEX ABLE £3 50 UP TO OVER 70 MTS OVER 70 MIS £5 0') DELIVERY IS By oudrAT » DEPENDENT uPON PSTANC,E

SMC LTD, SM HOUSE, SCHOOL CLOSE, CHANDLERS FORD INDUSTRIAL ESTATE, EASTLEIGH, HANTS SO5 3BY. VISA Tel (0703) 255111. Telex 477351 SMCOMM G. Fax: (0703) 263507

34 RADIO CO M M U NICATIO N October 1989 T E C H N I C A L

POWER SUPPLY COMPROMISES Power supply units remain an area where home COOKING THE VISION design and construction continues to interest TOPICS Gina Mode, I 7SWX draws attention to an article 'A many amateurs even in this era of black boxes. But microwave oven to amateur TV transmitter con- it is an area where care is needed, particularly if PAT HAWKER G3VA version' by David Pacholok (Creative Electronics the PSU is to be used to drive an expensive Consultants) in RF Design, March 1989. This transceiver or linear amplifier without inducing a same could be said for some factory-built PSUs). describes how he used a domestic 400-500 watt gnawing fear that one day it may inflict costly However, if compromises are to be made, it is microwave oven as the basis for a 2.3GHz amateur damage on itself or its load. Protection against highly desirable for those concerned to know and television transmitter with an FM vision output of excessive voltage output (transient or sustained), recognise what they are. For that reason it is my more than 200 watts, at a cost of under 8200. and over-current and short-circuit protection, switch- practice to publish constructive comments on Ti' capable of being received on the low-cost 2.3GHz on transients and current surges, including safe- designs, without this implying that the original down-converters sold widely in the USA for the guards against all likely fault conditions are design would not prove satisfactory in practice. 'pirating' of MDS (microwave subsciption-television important, while always paramount should be the Perhaps the main problem for the amateur designer distribution systems). One must have doubts safety of users, their family, pets etc. The degree is analysing what may happen in the event of a about the advisability of attempting to squirt out of voltage regulation and ripple filtering may vary sequence of component failures and deciding amateur TV signals from a 2M189A or 2M226A widely according to the intended load (transceivers what are the chances of particular components magnetron used as a self-contained, crossed-field intended for mobile operation will include in-built failing. power oscillator, with an HT supply of about 3.5kV voltage regulation). Then again, for some applica- The components count of high-current PSUs even by those with a good knowledge of microwave tions questions of size and weight and the desire can be significantly reduced by the use of engineering (the frequency can shift by up to to counter the rising cost of what we used to call specialised and over-rated components; unfortu- about 6MHz if the load is varied). It opens up a new the 'ironmongery' — mains transformers, smoothing nately these may not be readily available in the UK way of cooking the books. David Pacholok points chokes, metal cabinets etc — will need to be taken to those not working in the electronics field, An out that the basic transmitter scheme should be into account. In many areas of electronics, the interesting example of such a design is the 13.8V adaptable to other emission modes, such as 50Hz PSU is being superseded by switched-mode (adjustable), 20A maximum PSU described by narrow-band FM, with additional phase-lock cir- units and inverters with the tendency for these to Jean-Luc Barraud, FC1JEK (Radio-REF, No7/ cuitry. The RF Design article describes the function at ever higher switching frequencies and 1989) using SGS and Thomson devices: Fig 1. The characteristics of microwave oven magnetrons involving the need to counter radio-frequency- BUX21 series regulator is rated at 40A, 250W and shows how the built-in cavities can be interference (RFI) problems by the use of good (alternatives BUX20, BUX22) is mounted on a heat modified to couple RF to a transmission line EMC practices. For 50Hz and higher frequency sink at least 150-200mm (0.5° /W) and forced air instead of the oven compartment; it is also units the toroidal transformer has become estab- ventilation of the unit by means of a fan is strongly emphasised that safety must be considered para- lished (see TT March 1986. pp 186-7 for a recommended. The diode bridge can be mounted mount: "4kV DC and high power microwave summary of the advantages of toroids based on on the side of the metal cabinet or on another heat energy are present in the transmitter. An inexpensive information stemming from John Brown, G3EUR) sink. Capacitors should be mounted very close to microwave leakage detector should be used to as an alternative to conventional laminated-core the SGS L200 regulator (alternative Thomson check the integrity of the modified unit, and door transformers. TDB200) which also requires heat sinking, for interlocks should be retained (the modulator was To meet all the requirements outlined above example by mounting on the side of the cabinet. installed in the now-unused cooking cavity). with a high-voltage or high-current transmitter/ The use of a 6A miniature circuit breaker as switch Antennas can easily have high gain at this transceiver PSU is neither easy nor cheap, and in and 'fuse' is another feature. The design is frequency, so avoid pointing them at people, practice many of the designs published in TT and included here primarily for interest rather than buildings, etc." The author concludes: "Although elsewhere tend to include compromises that duplication. this is not a 'high performance' television transmitter, reflect the designer's belief that. despite Murphy's John Brown, G3EUR. with much professional it represents a low-cost effort to achieve significant Law, particular fault conditions are unlikely to experience, offers some useful comments on power output at microwave frequencies." Some of befall him. A PSU designed to function perfectly several recent PSUs that have been shown in TT, the shortcomings are discussed, along with possible under all fault conditions may in fact be over- including the two in the July issue: Fig 2 (p35) improvements. designed and not truly cost-effective. Most of us G4WAS's 13.5V high-current supply with crowbar only partly believe in the validity of Murphy's Law over-voltage protection; and Fig 4 (p36) G4IDE's and comfort ourselves with the thought that 600V/400V unit for the 50MHz valve amplifier. THY4 to blow the fuse F2. But the coil of RU in sustains all those who live dangerously: 'It won't Both raise questions of the protection arrange- series with C2 will present high impedance to the happen to me.' Thus most of the PSUs published ments. current surge. Feeding the network R1, RV1 etc in the amateur press tend to be based on units that G3EUR writes: "In the event of a catastrophic from the junction of the regulator and RL1 would have worked satisfactorily over a reasonable failure of the series regulator in G4WAS's unit, due give much faster turn-off and could permit a period of time rather than designs that would fully to collector/base-emitter short, the voltage across smaller value for C2. This is advisable since a satisfy a top professional designer (though the C2 (39,00012F) will rise until THY1 fires, turning on large-value C2 could deliver a lot of destructive energy to a short-circuit in the transceiver etc, although not as much energy as from a hefty 12- >3A volt battery. I consider that several fuses are 17 1 240/16v desirable at strategic points in the rig. For 1.00 VA example, I found the scale lamps on the VSWR Fuse meter and the 12V outlet for 'accessories' on my AC 20A rig were fed from the same 20A fuse that mains MCB ; I 240V 6A 'protected' the PA. For my peace of mind, I have added 20mm by 5mm holders and 500mA fuses. Voltage "I have never experienced a breakdown in a 10k adiust series pass transistor, perhaps because I always use conservative ratings and like to keep devices cool. Many years ago, in a professional capacity. I L200 found that different makes of 2N3055 transistors 820R when opened up revealed a more than 2:1 variation in chip area, often with poor thermal 121041 1 3 5 coupling between chip and header. I decided that cheap chips are poor insurance. The firm I was Fig 1. FC1JEK's 20A PSU based on relatively high-power components. Shown for interest rather than duplication as with encapsulates many type of regulators using some components may not be readily available in the UK. MCEI is a miniature contact breaker combined switch and 2N3055 devices and has had almost zero fault 'fuse'. (Radio-REP) records for a decade.

RADIO COMMUNICATION October 1989 35 TECHNICAL TOPICS

"But it has been my experience, more than once, that if RF gets into the control circuits of a Centre point of I4MHz dipole centre point of 14MHz dipole A regulated PSU, it can raise the output voltage —14 MHz --I I4MHz 2 sufficiently to turn on crowbar protection. This 3 happened recently al a Duxtord (part of the Imperial War Museum) demonstration when another TL transmitter was being tuned up. Stub line "In connection with the above notes, an average linear regulator has a source impedance of the A - order of 10 milliohms from DC to about 1kHz and 47spn , 3.5MHz this is usually less than the impedance of the cable 3.5MHz (Inc stub) 75f2 iwn (inc stub) connecting the PSU to the load. The impedance feeder 7,1 14.MHz acceptorij rises with frequency to tens of ohms at say 10k Hz, circuit hence the need for a bypass capacitor, but not • • 39.000mF. More important is low equivalent series resistance (ESR). A 1000e capacitor has a reactance of 0.16 ohms at 1kHz, adequate for bypassing audio, but the series-resistance may be higher, especially in old 'surplus' types. A new ANTENNA TOPICS radial type, for SMPS use, will have an ESR of around 0.1 ohm at 1kHz and stay low up to tens of From a number of antenna ideas recently received kHz. A mica or ceramic bypass for RF should then from readers, this month's selection includes an keep the PSU source impedance lower than the ingenious 3.5/1.4MHz wire antenna from C W cable impedance, so that large values of C in this Farrell, G8GS and a method of ensuring resonance position represent only excess energy storage. of narrow bandwith HF mobile antennas from "PSU design should be related to need: the load Charles Wilkie, GOCBM. variations in an SSB transmitter are relatively G8GS writes: "After improving signals to VK/ZL slow, modulation envelope sized; in CW there are on the long path by using a four-element wire fast square waves with a change in mean current beam comprising two colinear horizontal dipoles, related to keying speed (wpm). If the circuits prior each with a director, it was desired to incorporate to the final amplifier are voltage sensitive, it is a 3.5MHz facility into the system. This has been better that they should be stabilised or decoupled done and the arrangement works successfully on at their own low-current level, which also gives both bands. The method is shown in simple some protection and time for the main -PSU outline in Fig 2, utilising the voltage node points. protection circuits to work. This also applies to a switching being achieved with a 14MHz acceptor receiver. Over-kill is not good design: costs circuit fitted into the bottom of the quarter-wave money and space, and adds problems. stub. The array is compact, measuring approxi- "Questions of protection also arise in the G4IDE mately 52ft in length, the mast height being 30f1. Fig 2. (top) G8GS's dual-band (3.5 and 14MHz) antenna. PSU (July Fig 4). C9, C10, C11 together store No deterioration of the out-going 14MHz signals Fig 3; GOCBM reduces the need for multiple loading-colt about 16 joules of energy and in the event of a has been detected." The illustration does not short-circuit in the power amplifier (and there are laps by adding a variable capacitor to peak for show the 14MHz director wires. resonance while maintaining near-unity VSWR. at least five points in the PA circuit which could GOCBM required an efficient mobile antenna Dimensions of his 3.5MHz mobile antenna for guidance break down to chassis) the destructive energy for 3.5MHz and recognised that the key to only. would probably explode the 500mA fuse (F1) efficiency with electrically-short (high 0) antennas unless this was of the specially-designed, high- is achieving accurate resonance when changing on a field strength meter. Dimensions shown in voltage, sand-tilled type. 16 watt-seconds in 1mS frequency. He writes: "The usual way of achieving Fig 3 are for guidance only." is 16kW! Hence the bang on arc-over. resonance of mobile antennas is by means of a John Heys, G3BDQ reports some very successful "Then a common failing in such designs: most tapped loading coil, thus resonance occurs as a DX operation using a three-band (14, 21 and resistors of 1W or less are rated at 350V DC series of steps through the band with maximum 28MHz) and a two-band (3.5 and 7MHz) inverted maximum regardless of their value and I would not efficiency only when the operating frequency ground-plane antennas (see TT, May 1989 and recommend a single 10 megohm resistor (R16) for coincides with the resonance of a tapping point. many earlier references) based on the standard the 100mA voltmeter unless it was of the 50mm On the lower HF bands. bandwidth is often only multi-band dipole principle of parallel wires of spiral track type rated at 1kV continuous working. about 10kHz or less, and would entail the use of suitable resonant lengths. His triband unit (fed at "Then one must question the use of half-wave some 30 taps on the loading coil. I found that by the top of the three vertical radiators by means of rectification for the bias supply. Admittedly, the placing a variable capacitor at the base of the tuned 300 ohm BOFA ribbon feeder) has the resulting small amount of DC in a big mains antenna, resonance could be achieved at any 14MHz wire inductively loaded 3.5MHz radiator transformer will not saturate the core but a bridge- point in the band. Matching the antenna to a 50- with the bottom ends of both 3.5 and 7MHz type rectifier is cheap (38p) and could save one of ohm output of a transmitter is achieved by radiators folded back so that the total support the 100gF capacitors (36p) yet providing less inserting a 4.5µH inductor between the variable height is only 34ft (lower part 2ft above ground). ripple. I frequently see designs using toroids with capacitor and ground. In practice, I have found This is end-fed to a single wire radiation feeder to half-wave rectification, clearly it is not always that the twin requirements of resonance and unity an ATU which then also allows the antenna to be recognised that the gapless core of a toroid means VSWR can be achieved with only three taps and a tuned up as form of long-wire antenna for any that it can be easily biassed by DC. and then 365pF variable capacitor. In operation I simply band. G3BDQ hopes to publish an article on them blamed for core noise and excessive switch-on peak the variable capacitor for maximum signal before long. spikes."

of at least -42dB relative to PEP output (equivalent particularly where any degree of speech- SSB LINEARITY: THE MOVING to -36dB relative to one tone), whereas few compression is used. Apart from the actual GOAL-POSTS factory-built amateur rigs come within 10dB of amplifier stages, including the exciter, the PSU The recent series of references in TT to the this figure, and some are appreciably worse than must be able to handle the current peaks without question of the linearity of amateur transceivers this. drooping. including the increased duty-cycle and linear amplifiers continues to attract comment. It is worth recalling that many years ago. Les found with compressed speech and with frequency It was noted in the June TTlhat for many years the Moxon, G6XN pointed out in TT that the design shift keying (FSK) as used for RTTY, AMTOR and specification for most professional SSB/ISB trans- and operation of high-power linear amplifiers digital data. mitters has called for a third-order IMD performance requires a high level of good engineering practice, Paul Essery, GW3KFE writes . "May I pick up on

36 RADIO COMMUNICATION October 1989 TECHNICAL TOPICS your point recently about non-linear linears? Whilst I agree that many people overdrive linears, +500V some points need to be stressed; firstly that by- and-large valve linears perform satisfactorily given reasonable design and subject to not being overdriven. However, in my humble opinion by far the biggest cause of problems is the fact that +250V designers have moved the goalposts. In the early days of SSB — vide ARRL's SSB for the Radio Amateur for instance — it was accepted that a minimum of -30dB represented the figure for spurious output products. Nowadays, if you look —ve at manufacturers' literature covering equipment Bias with solidstate output stages — let alone solid- state 'big boot' amplifiers— you find specification figures for their IMDs of around -25dB at rated Fig 4. Dual voltage (plus negative bias) power supply as Fig 5. How a 15V + 15V toroid or laminated core transformer can be used to power a valve ORP (2-3W) output. used by G3EUR in the 1942 B-2 transmitter-receiver still represents an economical arrangement. transmitter. 15-20 VA torold transformer. Dl-D4 1N4003. "So where in 1989 is the problem with linears? C1-C4 50pF (100V). C5 25pF (200V). Overdriving is a running problem of course, although ALC can at least reduce this tolerably. dual-voltage (anode/screen) PSU for use with a usefulness of this approach is underlined by the But with the present design specifications, a linear typical medium-power valve transmitter or power fact that the current 'economy' ranges of power to perform adequately at 400W PEP output needs amplifier (TT, July, Fig 8, p38). His Scottish transformers, both toroidal and stacked-lamination to be rated at much higher output so that they instincts lead him to point out a cost saving can be types, have twin identical-winding secondaries: cannot be overdriven accidentally. It is surely made. He writes: eg 12V + 12V which can be used separately, in better to be momentarily 'over the limit' cleanly "The B-2 used a similar arrangement but with parallel or in series, for full-wave or bridge than to be plastering the band with splatter at legal the negative of the bridge arrangement forming rectification, thus providing very flexible compo- limit! the negative HT connection as in Fig 4. I used nents. A 15V + 15V transformer in a quadrupler "Secondly, and so few people seem to realise selenium rectifier-stacks, big and heavy compared arrangement can provide 150V HT for a 2-3 watt this, whatever the type of linear, as soon as the with modern silicon diodes, although nevertheless transmitter from a 15/20V toroid. Basic voltage- input impedance changes the driver stage senses semiconductors. With this arrangement there is multiplier circuits are shown in Fig 6 and a triple this and distorts. Thus to obtain adequate linearity no need for the resistors across the capacitors output PSU is shown in Fig 7. one needs a low-pass filter (to provide a constant since the centre-tap to the 250V line keeps the G3EUR adds: "Less obvious is the use of PSU impedance) between a blackbox transceiver and a voltage across the capacitors to a maximum of 1.4 circuits which give HT and LT from low-voltage. factory-built linear more, possibly, than at the times 250V. though it may be advisable to retain For example, using a TV-type valve, still cheap output of the linear if this is feeding an ATU. I had two resistors to bleed away the charge when the and plentiful, such as a PCL84 (triode-pentode handsome proof of this at my former 0TH. Woe unit is switched off. In either case, the current in with 15V heater) one winding of a 15V + 15V betide me if I did not have an LPF between linear the 250V line is supplied by diodes D1, 02 in the transformer can be used for the heater and the and rig; the second LPF merely cleaned up the bridge and the transformer rating is unchanged at whole with a quadrupler to give 150V HT for the slight increase in spurious output due to the linear the total wattage of the 250V and 500V loads. Note valve as a CO-PA as in Fig 5. Add a PCF80 (triode- itself. For more than two decades, I have had a TV that 220-0-220V rms gives an off-load voltage of pentode with 9V heater) as a simple receiver to the set built into the shack and switched on whenever 600V DC." 15V heater of the PCL84, then use a 25V + 25V the rig is in use. The problem was noted with Class The basic diode rectifying circuits of the July transformer and a tripler arrangement and you AB2 and Class B linears, but nobody realised, it TT, Fig 9 were all familiar to G3EUR but he have power for a modest transceiver, using the seems, that AB1 linears with ALC had the same considers it worth adding a voltage-quadrupler triode of the PCL84 as an audio output valve on problem. The point is that if the transceiver output arrangement which can provide a useful means of receive and as a crystal oscillator on transmit (a stage is forced into distortion the linear faithfully powering a ()RP value transmitter from a low- device used in the A MkIll of 1943). Even better, reproduces that distortion! voltage toroidal transformer: Flg 5. He included use DC for the heaters with an IC regulator such "With solidstate, designers seem to have com- this arrangement in his article 'Using toroidal as the LM317 to provide stable DC for the receiver pounded the problem by selling what in effect is a transformers' (Mercury. November 1985) to which LT and so reduce the drift associated with valves. PA tank circuit as an optional extra called reference was made in TT March 1986. The The possibilities are almost endless." 'automatic ATU'. In my opinion, the right way to go, in the long term, is to use FETs as transmitter amplifiers. But I still believe that many problems arise because the market demands 'modern solid- state technology' regardless of its suitability for a particular application. Leaving things to the mar- Load ketplace means in practice that 'fashion' rather than 'technical merit' is everything. It is fashion that puts all those confusing buttons and knobs on current transceivers. So many, that even after (a) (b) (c) several months of use, it can be a problem to 'drive' the rig. A few old-style controls would be infinitely easier to operate. Similarly the handhelds are virtually impossible to use with gloved hands. as might be necessary in an emergency."

ECONOMICAL DUAL-VOLTAGE AND VOLTAGE-MULTIPLIER (d) (e) (f) PSUs John Brown, G3EUR, was stirred to take a long Fig 6. Basic voltage-multiplier PSU configurations. (a) Conventional voltage-doubler. (b) Cascade-type voltage doubler. (e) Voltage tripler. (d) Cascade-type voltage tripler. (e) Voltage quadruplet. (I) Cascade-type voltage- look back to the 1942 era, when he designed the quadrupler (extendable to an n-times voltage multiplier). Note that voltage regulation between load and non-load Type 3 Mk II (otherwise known as the B-2) conditions is very dependent on the value of the capacitors and that such circuits are more suitable for relatively low- transmitter-receiver for SOE, when he saw F8CV's current loads.

RADIO COMMUNICATION October 1989 37 TECHNICAL TOPICS

discharge curve that makes it difficult to use a voltage-sensitive controller. However, for lead- acid batteries, where the voltage increases signifi- cantly as the battery approaches the fully-charged state, it is easier to use a voltage-sensitive controller which can be either an add-on unit or built into the charger. Ron Wilson, G3DSV draws attention to a charger-controller of this type that was described by J P Bell, G4LSA and E J Barker in Practica) Approx Wireless (June 1985, pp20-21. 53). He writes: "I equal use a 12-volt vehicle battery for running my HF rig currents z..rd have been following the notes in TTwith some interest. You mention chargers taking batteries up to 13.8V. In practice, most of the chargers I have come across will take a battery up to 14.4V and Fig 7. A trIple-voltage, regulated supply using the twin-wIndings usually found in modern toroidal and laminated core indeed this is the voltage found on many cars, my transformers. With the back-to-back hall-wave rectilication of the two 12V outputs it Is advisable to ensure that the Volvo for one. This voltage is a bit too close to the loads are balanced to avoid a DC component in the gapless core of a torold, if necessary by adding loading 15V maximum of some older rigs (although most resistor(s). The lop section uses a bridge and provides about 15V OC across the 4700uF capacitor. This is rather high for a 5V IC regulator and the heat dissipation can be reduced and smoothing improved by adding a low-value resistor newer rigs are now rated at 16V maximum). The as shown (1.8 ohms in this example) which drops about 3.6V at the lull load of 2A with the second 4700p capacitor policy of watching a voltmeter is sound but it is so giving extra smoothing. (G3EUR, Mercury, November 1985). easy to forget to adhere to, as I well know. I would like to draw readers' attention to the controller described by G4LSA. This cuts the charger almost HF PACKET RE-THINK? departure for a new HF packet protocol, it out, in practice down to about 100mA, when the nevertheless sets a standard for comparison." voltage reaches 13.5 to 13.8V (this can be adjusted Without, this month, pursuing the CW/AMTOR If l were an AMTOR operator, which I am not, I and mine is set to 13.6V). The controller is simple debate, which arouses strong feelings on both would not be entirely convinced by W4RI's and inexpensive to build, and can often be built sides, it seems worth drawing attention to an strictures on its efficiency. There is little doubt within the charger enclosure." article by Paul Rinaldo. W4RI, the Editor of OST, that in reasonable (and not so reasonable) condi- The G4LSA controller was intended for use with 'The Great 1989 HF Packet Design Quest' (QST, tions the throughout of anything between say 30 lead-acid vehicle batteries (charging rate about 4- May 1989) in which the 'dragons' of HF packet and 50 baud can shift a lot of words, at least in 5A) used to power SSB transmitters with an operation — multipath, intersymbol distortion, upper case letters! Even on VHF, AX.25 packet can output of up to about 100W requiring 13V OC al up group delay, ORM, ORN, busty errors, contention involve a large number of retries which can bring to about 25A peak. When set to 13.5V it cuts out, and retries — are given an airing. W4RI believes its throughput tumbling down. Meanwhile I intend reducing the charging current to a very low value, that the time has come for amateurs as well as the to keep plodding along with hand Morse! when the battery is roughly 85% fully charged and increasing number of professional users to rethink greatly reduces any tendency for the battery to the AX.25 protocol for HF operation, for which it is BATTERY CHARGER 'gas'. clearly far less satisfactory than AMTOR. He CONTROLLERS In the PW article, G4LSA pointed out that introduces his appeal for a quest to find a less Recent items in TT have stressed that lead-acid modern vehicle batteries of the low maintenance' vulnerable protocol as follows: and nicad rechargeable batteries can have their type can be topped up with distilled water in the "Medieval mariners knewthat the earth was flat. active lives shortened by subjecting them to traditional manner. Plates now contain less antimony As they sailed near the edge of the earth, it was frequent overcharging, sometimes when attempting than before; this reduces the amount of gassing commonly accepted that 'beyond this place there to keep them fully charged by continuous trickle and the batteries require less topping up. With be dragons.' Hams now knowthat amateur packet charging. The August TT included some sugges- modern 'sealed for life' batteries, the plates have radio works well on VHF/UHF, but not too well on tions on the use of timers designed to reduce very little antimony or may replace this altogether, HF. Sure many of the HF bands are buzzing with greatly the charging rate after a fixed period of by the use of calcium. The sealed batteries cannot packet activity... The problem is efficiency; ie. time. This approach is well suited to nicad be topped up (without drilling into them) but since too many retries to get past the monsters. batteries which have a fairly 'flat' voltage charge/ a small vent is provided to prevent the pressure Because the AX.25 protocol includes an error- checking feature, packets with even itty-bitty errors are shunned by the receiving station. Then, AIRCRAFT-ENHANCED is only a short plume behind the aircraft. the automatic repeat request (ARO) feature of PROPAGATION: A CONTRAIL "In the tropical stratosphere, where the lowest AX.25 takes over and keeps on retrying until a HYPOTHESIS temperatures are to be found, persistent contrails packet runs the ionospheric gauntlet of monsters Arising out of the item 'Aircraft-enhanced propa- are formed by the aircraft exhaust gases. These completely unscratched... Why not just use gation debate' (TT, August 1989, pp36-37). Brian gases contain sublimation nuclei so causing AMTOR? Of course, it is a partial solution that's Measures, GOHKR puts forward an interesting supersaturation with respect to ice with radio here today. There are even packet-to-AMTOR hypothesis: he believes that an explanation of the signals possibly bouncing off the resultant ice gateways. However AMTOR has its problems. mode discovered in the south of Australia may be particles formed in the contrail. AMTOR is based on the older Baudot charater set found in the visible aircraft exhaust trails called "Therefore, it appears that the forward scattei rather than the newer ASCII character set which is condensation trails or 'contrails'. He writes: propagation researches of VK2ZAB and VK3UM replete with upper and lower case, more symbols "Water. a by-product of combustion. is ejected which found that the signals from VK1BG at and computer control characters. At best, even through the aircraft exhaust gases and tends to Canberra (roughly mid-way between Sydney and when band conditions are perfect, AMTOR has a raise the relative humidity of the air whilst heat Melbourne) 'lasted from just a few minutes to tens maximum efficiency of 50 per cent, as only three generated by the engines tends to lower the of minutes: clearly point to the creation of characters are sent at a time, then the sending relative humidity by raising the temperature in the contrails in low-level or high-level saturation station must get an acknowledgement (ACK) aircraft wake. The net result sometimes is a conditions where contrails were either a short before proceeding with new characters. While the contrail. plume or of a long, persistant nature. It appears to symbol rate is 100 bauds, the throughput is "A contrail occurs when the air temperature is in me that the disciplines of meterology, flight and between 0 and 50 bauds depending on band the range -24°C at sea level to -45°C at 50,000 Amateur Radio need to come together in this conditions. When the concept on which AMTOR feet. It can also occur exceptionally when operating debate and research." is based was first conceived some years ago, at full throttle. If the surrounding air is at, or near, Sydney/Canberra/Melbourne are roughly al designers didn't have the luxury of today's microp- saturation the contrail is long and persistent, latitudes that correspond in the northern hemisphere rocessors and other digital integrated circuits. whereas if the relative humidity is low the contrail to the Mediterranean area (eg Spain/Morocco) Whether or not AMTOR is used as a point of

38 RADIO COMMUNICATION October 1989 TECHNICAL TOPICS

however that the DC output terminals of the charger must be independent of the mains earth, HERE AND THERE otherwise the controller may be bypassed. The August TT included a list of solvents used in A full-size overlay and PCB track pattern is the electronics industry that can cause health and given in the PW article together with notes on environmental problems. As became clear several setting up and testing, but construction should years ago (see, for example, Electronics Week, not be critical and operation is quite straightforward. March 18, 1985 'Toxic chemicals jar industry') the Perhaps the most important point to note is that if semiconductor industry and the fabrication of the battery is fully discharged ZD1 may not printed circuit boards involve a large number of conduct and the battery will not be charging potentially harmful substances. Some experts unless a switch or shorting jumper is added across have claimed: "no other industry on earth uses THY1 (anode to cathode). nastier chemicals than the sem iconductor industry." The July TTincluded a warning on the importance The Electronics Week article noted that "the of using battery clamps that cannot result in the chemicals in question are those acids, gases and full voltage from a charger reaching the equipment. solvents used in every phase of semiconductor G3DSV points out that "available from caravan manufacture, from the silicon ingot to the finished shops are snap on/snap off clamps suitable for chip. They are: (1) sulphuric and hydrochloric batteries with round posts. Inside each clamp are acids used in cleaning chips and hydrofluoric two fixing screws, one for the charger and one for acids in etching them. They are all irritating to the rig. The clamps are rated at around 100A and skin, eyes and the respiratory tract. Hydrofluoric make a very positive connection." Personally, t acid also attacks bones. (2) Silane, arsine and feel one would need to be fully convinced that the phophine gases are used for doping and fluorinated clamp could not under any circumstances become hydrocarbons for plasma etching. Silane is pyro- detached from the battery lug, since this would phoric, that, it can ignite spontaneously. And (3) create just the situation that must be avoided. organic solvents, which are used in vapour Fig 6. (a) G4LSA battery-charger controller (b) G3DSV also reminds us that a breakers yard can degreasing, pose one of the toughest problems tilodIficallon for adjustable voltage replacing R2. be a useful source of low-cost car batteries: "My because they can't be neutralised. They are (Practical Wireless) son and I have purchased batteries for £8-£10. The blamed for cancer and birth defects as well as for main point is to look at the date on the battery. We systemic illnesses." building up if the battery is overcharged, frequent have managed to purchase batteries less than a Clearly the risks are to those involved in venting will make the battery unusable. Since year old, from crashed cars." manufacture or living in areas where effective most cars are now fitted with alternators rather Vincent Evans, G4AVT is another TT reader waste disposal has not been employed, and not to than dynamos, the primary task of a car battery is who uses a lead-acid car battery and charger for users of semiconductor equipment. But it could to provide the initial heavy surge of current his 144MHz and HF transceivers. To avoid continual be argued that it is the responsibility of us all to be (hundreds of amps) and are not designed to be checking of voltages, he, like G3DSV, uses a aware of the potential hazards and to do what we deeply discharged. voltage-sensitive controller but intead of a thyristor can to see that the necessary steps are taken to The G4LSA controller (Fig 6) is designed to he uses an electro-magnetic relay: Fig 7. Full prevent environmental pollution or the creation of charge the battery when this discharges to about details of his 'Automatic Battery Charger' appeared fire or explosive hazards. 12V. Initially a partly charged battery should be in Ham Radio Today (September 1988, pp42-44). connected since a fully discharged battery will not The action of his system is basically similar to that enable the controller to function. With a battery of the G4LSA unit in that the charger is left on voltage of about 12V but less than 13.5V. ZD1 continuously but is switched through to the switching the transformer in the mains lead would conducts and TR 1 and TR2 are 'off'. The thyristor battery only when the battery voltage is between cause a current surge, giving a momentary high THY1, with its gate voltage derived through R5, about 11.5 and 13.5V after setting the cut-out output voltage and misleading the voltage- will be 'on', effectively passing the charging adjustment RV1 with the aid of an accurate dependent switch. A resistor in the line to SW1 current. When the voltage increases to about voltmeter. The relay must have heavy-current might provide an anti-surge device but this has 13.5V (or as set). ZD1 conducts, turning both TR1 contacts, the specified unit being a 12V SPDT not been tried. and TR2 'on', thus clamping the gate of THY1 to its 320R, 10A at 240V contacts, PCB mounting, Peter O'Keele, VK3YF, in Amateur Radio (VK), cathode, switching the thyristor 'off'. Where a Maplin type YX97F. Full constructional details are April 1989, discusses the various types of lead- substantial load is being drawn from the battery, given in the Ham Radio Today article. G4AVT acid batteries now on the market, including the effect will be to switch the charging current adds: "The device is self-contained so that no various forms of 'Deep Cycle' batteries intended quite rapidly on and off. alteration has to be made to the charger, and it is a for non-vehicle use but imposing various charging THY1 requires heat sinking and this could be reasonable DIY project. The charger is always on constraints and often carrying only a six-months the metal lid of a small diecast aluminium box (114 but current consumption is negligible. The more guarantee. He also notes that the sealed gel-type x 54 x 30mm) with the thyristor mounted on the experienced amateur could very well build the batteries sold for automobile use are intended underside of the lid. With the specified device an device into a simple charger, and perhaps experi- strictly for engine-starting purposes and have a insulating washer is not needed and the anode is ment by putting the relay contacts in the mains very limited stationary capacity. For conventional bonded via the mounting tab to the box. Note lead, although caution would be necessary since wet lead-acid batteries, he advises: (1) Keep the electrolyte up to the required level. (2) Check the specific gravity of the cells periodically using a hydrometer — cells should have a gravity of at least 1230 when the battery has been left overnight. (3) Charge at about 14.4V, 4A for nine plate batteries, 5A for eleven plate batteries, for about 12 hours. Four hours after gassing begins you can assume the battery is fully charged. The specific gravity will then depend on the condition of the battery. Those who recall such books as the classic Admiralty Handbook of Wireless Telegraphy of the 1930s, with its stress on the care of batteries, may feel wryly that it all goes to show that technology often moves in circles. But then, it has long been evident that it is often easier to generate Fig 7. G4AVT's battery-charger controller using a relay rather than a thyristor. (Ham Radio Today) RF power than the necessary DC!

RADIO COMMUNICATION October 1989 39 SMPS

Switched Mode Power Supplies (SMPS) can often the use of fans in order to provide adequate be picked up cheaply at rallies, but what is a cooling. Some manufacturers minimise the heat switched mode power supply; how does it work, dissipation requirements (and hence costs) by how does it differ from a linear PSU and what are Switched designing units for intermittent use, relying on a the advantages and disadvantages of such types low continuous current demand combined with of power supply? The aim of this article is not to an ability to provide current peaks for short advocate one or the other, but to describe how periods, such as is found with SSB transmitters. linear and switched mode power supplies work Mode and lay out the various design criteria together SWITCHED MODE POWER with the pros and cons of each. SUPPLIES A power supply is a unit that accepts power A different approach is the switched mode power from a one source and converts it into a form supply. The SMPS is generally smaller than its which is suitable for a particular application. Power linear counterpart but introduces other problems. Throughout the sphere of electronics there are As in most engineering solutions the final choice many such applications and typical inputs are the is made by weighing up the pros and cons so as to mains at 240V AC or DC supplies at unsuitable determine which is the best option. voltages. Typical DC outputs from such power Supplies The switched mode power supply exists in supplies are 5V. 12.5V, ±12V and 24V. In the various forms but the isolation between input and majority of cases the radio amateur is interested in output is still provided by a transformer. The size the conversion of the AC mains into a low voltage Clive Smith, G4FZH, lays to of the transformer is dramatically reduced by DC output suitable for running 13.8V equipment. rest some of the mysteries of operating at a high frequency (cg 50kHz) and It should be noted that, with either type of PSU, carrying out part of the smoothing at high voltage two processes are carried out - the AC to DC the SMPS and shows that where the current requirement is smaller. High conversion and the change to a different voltage they aren't so complicated frequency transformers are not made from lami- level. nations (such as for 50Hz) but are made from after all. ferrite materials. The reason why laminations are LINEAR SUPPLIES used at 50Hz is to keep the eddy current losses in In the conventional linear power supply the the transformer core low - with ferrite the losses changes will occur in the order shown in Fig. 1, ie a of a smaller smoothing capacitor but the transformer are much lower and so the size of the transformer voltage level change followed by AC to DC bulk increases. The excess voltage is removed by the core is considerably reduced. All of this reduces conversion. The level change is usually accomp- regulator but, since power = volts vamps (P = VA), the size of the overall power supply but at the lished using a transformer and the AC to DC it follows that as the excess voltage is increased so expense of complex control circuitry and the conversion by means of rectifier diodes, smoothing the regulator must dissipate more power. This possible production of radio interference (RFI). capacitors and regulators. For a heavy duty DC then requires a larger heat sink which leads to the Typical efficiency of these units is around 75% general trend for heavy duty linear supplies being power supply such as 13.8V at 25A (345watt DC whereas a linear supply is closer to 60%. output) the transformer must capable of handling large and cumbersome. They also require adequate A typical block diagram of part of a switched the total power loading including losses. When cooling arrangements which sometimes requires mode power supply is shown in Fig. 3. The the supply is provided at a frequency of 50Hz this unregulated DC input is converted to a high requires a sizeable unit due to the materials and frequency AC supply (cg 50kHz) and a transformer laminated structure of a suitable transformer. AC Low-Volt age provides the voltage translation and isolation. The MainS DC output Also, because of the low mains frequency, the AC lo OC AC is then rectified and the resulting DC is then number of turns required on the primary winding Iconversron smoothed (filtered). A sample of the smoothed is quite high and this in turn necessitates the use output voltage is led back to control the high of thick, heavy-duty enamelled copper wire in the frequency switch so that the output voltage is well secondary winding. Whilst the rectification process regulated. The unregulated DC input can come Fig. 1 (above) Linear PSU configuration showing voltage causes little problem (rectifiers are cheap and conversion sequence and Fig. 2 smoothing process. from a battery, generator supplies or rectified readily available), smoothing and regulation are mains with some smoothing (as in Fig. 4). inter-related and these factors usually require a fair amount of space and cooling. As a rule of HIGH FREQUENCY SWITCH thumb, the regulator typically requires a 3V drop The high frequency switch is In essence a power across it in order to function correctly - hence the oscillator with rectangular output pulses. Fig. 5 lowest input voltage allowable must be at least 3V shows a simplified view of the high frequency above the desired output when the unit is on FULL Ropple switch and transformer arrangement. Control eroes1 bnpul load. Voltage circuits drive the switch with rectangular pulses Fig. 2 shows a typical arrangement for the DC t (Waveform A) which cause Waveform B to appear side of a linear power supply. Smoothing is across the transformer primary. This induces a accomplished by electrolytic capac- voltage in the secondary of similar itors and the ripple depends on the shape but of an amplitude which is value of capacitance and the current dependent upon the turns ratio being drawn. With low current supp- N1:N2 — Waveform C. The elec- lies, cg less than 2A. the value and tronic switch may be either a bipolar physical dimensions of the capacitor transistor or a power FET which are not too formidable, but these must be capable of withstanding increase drastically when currents high voltages. The power FET has of more than 10A are required. One advantages in that it is voltage approach for keeping the minimum driven and not current driven as for 3V differential between input and the bipolar transistor. As the devices output of the regulator is to use a switch on the high voltage side of transformer which has an increased the transformer the current switched secondary voltage output but the is low, normally a few amps in a power handling capabilities of the 500W supply. transformer must also be increased The electronic switch can take in order for the regulated DC output various forms and Fig. 6 shows two current to still meet the desired more arrangements. Note that in specification. This would allow use Fig. 6b the capacitors must be of a

40 RADIO COMMUNICATION October 1989 SMPS

Fig. 5 kit:N2 High-frequency transtormer

Feedback to provide regulation 1..« I t Unregu1 lated DC supply Fig. 3 Switched Mode PSU block diagram. type which are suitable for handling current at the current is about 2.5A on average: thus for a n n nA switch operating frequency (low equivalent series maximum 50% duty cycle, the power dissipation Electronic switch resistance and inductance). In both these cases per device is about 3.5W maximum. the drive waveforms 1 and 2 are in anti-phase and are generated by control circuits which are now OUTPUT TRANSFORMER available as dedicated integrated circuits (ICs). The transformer is quite small - typically 70 x 68 x To provide a regulated DC output voltage, a 17mm for a 500W output. It is made from ferrite for sample is fed back from the DC output and the reasons stated earlier and takes the form compared with a reference voltage to produce an shown in Fig. 10. The transformer would weigh error signal. A common way of providing the about 1 kilo. as compared to an equivalent regulation is to allow this error signal to alter the transformer for a linear supply which would not mark:space ratio of the drive waveforms whilst only weigh between 7 and 10 times more but also keeping the frequency constant. This produces be considerably more bulky. The number of turns waveforms as shown in Fig. 7 and is known as required for the primary winding is significantly Pulse Width Modulation (PWM). This is not the reduced from that required by a 50Hz transformer. only form of control but is the most commonly and this also applies to the secondary which is used at present. advantageous in that the secondary winding (a) Push-pull In systems using two electronic switches (Fig. 6) requires quite thick wire because of the current the drive waveforms must be in anti-phase and requirements. never capable of switching both devices ON simultaneously - if they do an explosion usually OUTPUT RECTIFIER Drivel results! Typical waveforms generated are shown The output rectifier used (see Fig. 3) must be of a in Fig. 8 and these introduce the concept of 'dead type which will switch ON and OFF very fast - ie at time' a period during which it is guaranteed that 50kHz or more. The type of rectifier used at 50Hz both drives are zero thus allowing the electronic is wholly unsuitable as it cannot switch fast Drive 2 switches to turn OFF. The actual drive waveform enough. The output rectifier will be of a type across the transformer primary is shown in Fig. 9 described as a 'fast-recovery rectifier diode' which and this is reflected, of course, in the waveform of may be packaged as discrete units or often as two the transformer secondary. diodes in a single power encapsulation such as ( b) Halt-bridge Fig. 6 In the dual switch circuits, since there is current TO3 or SOT-93. The rectifier does get quite warm flowing in opposite directions on different half during operation and therefore must be mounted cycles, the magnetic flux reverses and prevents on an adequate heatsink. magnetisation of the core. With a single switch, the current only flows in one direction and so OUTPUT FILTER steps are required to de-magnetize the transformer The output filter acts as an averaging device and Fig. 7 core. In the circuits of Figs 5 and 6a, the back EMF usually consists of an inductor and a capacitor. produced by inductive action dictates that the the former being about the same size and weight Fig. 5 High frequency switch and transformer section of switches are rated for at least twice the maximum as the transformer but with a gap in it, a typical an SMPS DC supply voltage, whereas in Fig. 6b the devices arrangement is shown in Fig. 11. This includes a need only be rated at the maximum input DC bleed resistor to allow the capacitor to discharge Fig. 6a-b Alternative switching arrangements. voltage. This means that for a 240V RMS input when the power supply is switched off and also to Fig. 7 Error signal wave-form. (peak value 340V) the devices should be rated at provide a small minimum load. 680V and 340V respectively. It is always good practice to be conservative with the voltage CONTROL IC ratings and devices with minimum ratings of 800V As mentioned earlier, the control circuit is now and 400V respectively are commonly used. For generally in the form of a dedicated IC, such as the example an IR740 has a voltage rating of 400V, a SG3526 by Motorola and Silicon General. A maximum continuous current of 10A and maximum representative block diagram of a typical control Fig.') Dead time wave-form in dual switch systems. drain to source resistance of 0.5511 when ON. This IC is shown on Flg.12 and will serve to describe means that even at 10A, the maximum continuous Fig. 9 Drive wave-form across translormer primary. some of the functions offered. power dissipation would only be 55W - and in The IC incorporates an internal oscillator practice the mark:space ratio is less than 50%, circuit, the frequency of which is set by an being spread between two devices. For a power Drive 1 external R-C network. In association with the supply with a 2kW output the heatsink requirements oscillator there is an external resistor which are quite moderate. For a typical 500W output allows various dead-time values to be set. In order supply driven from the 240V AC mains, the drain Drive 2 to minimise the in-rush currents when the switched -- mode circuit starts up, there is a soft-start L_ Fig. 8 I.— Dead time arrangement. The period for which this is operative is determined by an external capacitor and is typically for the first few seconds. For the voltage comparison the IC produces a Unregulated reference voltage (eg 5V) and this is fed to one OC input terminal of the comparison amplifier, a sample of the power unit's DC output being fed to

the other input. The resulting output error signal Fie 9 I.—Dead time Fig. 4 Typical SMPS power source. from the amplifier is then used to control the

RADIO COMMUNICATION October 1989 41 SMPS amount of the generated pulse signals which are BR2 and REG1 this forms a regulated DC power used to drive the output circuitry. The output supply for the SG3526 IC (typically 12V). A circuitry consists of two drive circuits which are feedback voltage is taken from the main power fed with anti-phase signals so as to allow either supply output via a resistive potential divider R13, single-ended (Fig. 5) or double-ended (Fig. 6) RV1 and R14 with C20 removing unwanted switching arrangements. disturbances from the feedback voltage. It is Most of the controller integrated circuits necessary to use the divider chain since the contain some form of protection. Typical of these internal reference of the SG3526 is 5.00V and the are dynamic current limiting and shut-down. feedback voltage should equal this. Potentiometer Dynamic current limiting is achieved by monitoring RV1 allows slight adjustment for component and the current supplied to each of the electronic output tolerances, R15 feeds back the reference switches. Circuit components can be arranged so voltage to the comparison amplifier and C19 is for that the control circuit tries to shut down if a decoupling. preset value of current is exceeded on each Fig. 10 SMPS output translormer. The soft start capacitor is C13, whilst R22 and supply pulse, thus protecting the power switch. C15 are the main oscillator timing components, Remote shut-down is explained in the next with R18 defining the dead time. Dynamic current section. feedback is from current transformer T3 loaded by OC from Regulated f16. The dynamic current feedback is rectified by rectifier DC output diodes D3 and 04, slightly smoothed by C14 to REFINEMENTS remove some spikes and applied to the voltage Refinements consist mainly of additional monitoring divider RV2/R 17, with RV2 being used to set the circuits which will try to shut down the control Fig. 11 SMPS output filler. level at which dynamic current limiting occurs. circuit when excess output voltage is detected or Output drive to the power switches TR 1 and TR2 if the safe output current is exceeded. The shut- 'snubber networks'. With fast switching waveforms is via C17 and C16. These anti-phase outputs drive down signal required by the IC is a logic signal in inductive circuits there is always the risk of the power switches via isolating transformers Ti which indicates if the above parameters have been voltage spikes occurring at the switching edges, and 12 which are small ferrite cores wound with especially if the magnetic circuit is not perfect. exceeded. A typical block diagram of the arrange- bifilar wire giving a 1:1 turns ratio. Resistors R20 ment is given in Fig. 13. The 'snubber networks' together with the inherent and R21 ensure that the gates of the power FETs drain-source diode of the power FETs. are used to are biased to ground to prevent them accidentally reduce these spikes to within acceptable limits. switching ON. Back to back zener diode combina- PRACTICAL SMPS Transformer T5 is part of the dynamic current tions D5/6 and D7/8 are to clip any dangerous Fig. 14 gives a typical circuit diagram of a limiting as explained earlier and is fed to R16 et al voltage spikes and limit the voltage applied to the switched mode power supply but without over- (see later). gates. R12 and C12 are compensation to ensure voltage and over-current protection. The diagram The power transformer T3 uses a centre tapped that the internal comparison amplifier does not spi its horizontally, with the power circuits being in secondary and Dia and Dib are the fast rectifier oscillate and R 19/C18 provide decoupling on the the upper half and the control circuits in the lower. diodes. R8/C7 and R9/C8 being snubber networks. output drive circuits of the control IC. The mains is supplied, via a fuse Fl for The output filter is formed by components Li and protection purposes, and is then full-wave rectified C9, with a bleed resistor R11 whilst D2/R10 merely RFI by BR1. This feeds smoothing capacitors Cl and form an output indication and C10 provides Switched mode power supplies can be prone to C2 via resistor R1 which limits the inrush current decoupling at radio frequencies. causing RFI on nearby receivers. This is because to Cl and C2 on switch-on. Note that the only The control circuits are built around an SG3526 of200kHz) the frequency and the at sharpwhich switchingthey operate waveforms (eg 50 - reason why the smoothing capacitor is in two integrated circuit and as isolation is required sections (C1 and C2) is that the circuit can easily between the mains input and the DC output of the which generate harmonics well into the RF be modified to allow 110V operation. Because Cl power supply, steps must be taken to ensure this. spectrum. and C2 are in series, resistors R2 and R3 are There are two basic choices, a) have the control When building a switched mode power supply necessary to equalize the voltage across them. circuits connected to the mains side and isolate one should ensure that it is in an earthed metal The unregulated DC appears across the combina- the feedback voltage or b) have the control case, which not only affords good screening but tion Cl, C2. R2 and R4 as shown in Fig. 4. circuits directly connected to the output and drive also prevents interference via the mains wiring The basic power switch is of the half bridge type the power switches via isolating transformers. In when the necessary RF input filter is used. When and is essentially C3, C4, 13, TR1 and TR2. There this circuit the latter course is chosen on safety using an RF filter take note of the advice given as are additional components in this area and their grounds as there is rio problem posed when using some of these need to be earthed. function is as follows: R4 and AS ensure that the an oscilloscope to examine waveforms on the centre point of C3 and C4 is at half the supply control circuits. SAFETY voltage and networks R6/C5 and R7/C6 are 14 is a small mains transformer and with C11, When making, repairing, modifying or using

Supply Voltage o

Voltage reference T I output Voltage reference internal circuits CT Oscillator RT Rdead-t ime o

Csoft-start o Soft-start Drive 1 Fo

Drive Voltage comparator control Voltage reference —- 1b Drive 2 Fig. 12 Block diagram of a typical SMPS IC circuit. ceedback Voltage o Dynamic current limit Fig. 13 Auto shut-down circuit

From current sampling Fig. 12 Shutdown —

42 RADIO COMMUNICATION October 1989 SMPS

+V

F51

21.0 Yac

J ec 18

h R19 /7.T

Ti C17 • 5 14

a ::... 7 c 8 R16 C12 9 10

b eat I Dbi C20— .1 ". C13 -4- I- 4 . r " 06 I R17 R22 C15

Fig. 74 Schematic ol a I T typical SMPS unit. switched mode power supplies, do take care as suitable rating. If the earth becomes detached in most electronic circuitry there are variations on dangerous mains voltages are present in some of from the metalwork, this may float up to half a theme and so it is not possible to cover them all the circuits. In many instances an oscilloscope supply voltage. in an article such as this. cannot be connected directly to the unit as it will Readers may be interested to know that we be earthed. If the mains input side needs to be IN CO N CL U SIO N hope to publish a constructional article in the near examined then feed the SMPS via a 1:1 mains This article has tried to describe the operation of future for a 12.5V, 20A supply based on the circuit isolating transformer (notan auto-transformer) of switched mode power supplies in simple terms. As in Fig. 14. t*Evc0 W HEN QUALITY COUNTS \ REVC ONE The UKS favourite discone composed of traditional British quality engineering. RADA C The FtEVCONE works well without exaggerated advertising claims it is designed to Cover 5010 500MHz. and thousands of sateshed users will testify to its efficiency Unlike some This Wide-band antenna offers an interesting alternative to the manufacturers we do not claim a wider frequency coverage, and discone. II is simply an array of dipoles. but the clever bit involves we do not quote inflated ligures lot gam. A gain ligure is arranging thedipoles to maximise bandwidth and minimise interation. meaningless unless the reference point is stated The RADAC can be set up for a range of frequencies from 27MHz lo Optional vertical whip feature. It is possible to fil a vertical whip 500 MHz, and because very good impedance matches can be section tea disclose We do not want to give you the "hard sell" obtained the user can specify any six frequency bands in this range where this vertical element is concerned but there is some for optimised performance, either for receiving, or more usefully, for evidence that it may improve the performance of the antenna transmitting For example. all the Amateur Bands from 10M to 70CM around the reasonant frequency of the whip That's why we can be covered in one antenna. If you are in the MAR business, the make it an optional feature. RADAC can be customised for your needs. Aircraft listening Another option is the N-type connector instead of the popular enthusiasts can specify VHF á UHF Airband coverage $0239 N- types give a better UHF performance, but they coast a What a versatile antenna, Design and engineering excellence from bit more The choice is_yours REVC01 Because the 11....PVCrJNE is British-made by a Company which has been in business for 30 years. you buy with confidence knowing that there is back-up should anything go wrong

WIDE-BAND PRE-A MPLIFIERS ON-GLASS ANTENNAS The problem with omni-directional wide-band antennas is their lack of gain This type of antenna mount has been around for a long lime, but they are very The REVCO PA3 range of wide-band pre-amplifiers complement the antennas and difficult to produce successfully al VHF. The Cellular Radio Industry has compensate Or their short-comings 1 1 popularised the glass-mount. but there are fewer problems at 900MHz. The basic specification of the products is similar: coverage 20MHz- I GHz, at IGHz: because the coupling assemblies are small REVCO's extensive experience in minimum gain I3dB, noise factor 5.563 Choose from a mast-head version (PA3) or a making the UK's best Cellular On-glass has lead to the production 01 superior standard die-cast box style (PA31) Best results are normally obtained from the masthead quality VHF and UHF models Here are a few facts which you should know. model which gives a boost lo weak signals which would otherwise have been lost in the Coupling efficiency: apart from the question of effective power transfer to the feeder cable Also feeder cable noise is not amplified which is the case if the amplifer is outside world, you don't want too much RF floating around inside the car, do mounted at the base of Melee-der. On she other hand, the die-cast box version requires no you' Not healthy for vehicle electronic systems, and possibly not good for special installation and is readily taken out of circuit The masthead humans either. REVCO glass mounts feature very efficient power transfer. model ts supplied with a special power unit which feeds the DC supply Slicking power no good if they fall oil ban way home. A properly installed into the antenna leeder No grou is provided tor the PA31. as any 9-15v DC REVCO stays on Should you change your car, a refit kit is available. source is suitable (current requirement about 25mA). Simplicity: some of the competition has a multitude of loose components: the The PA3I finds application in instrument work. e.g input to REVCO has 2 pre-assembled parts inside and outside. What could be spectrum analysers, boosting the output from signal simpler? generators to give a low-power Tx Weather-resistant: REVCO antennas are made from corrosion resistant The standard version ol the PA3I has BNC sockets and es materials so you can leave them out in the rain with confidence it is not designated "PA31/13". available to special order N-type necessary to plaster the product with silicone rubber to keep the water sockets CPA-31zSr•I or S0239 CPA31/S-) out A special feature of the PA3 series is a high-pass filter The REVCO glass mounts do cost a bit more, which reflects these to attenuate frequencies below 20MHz. high-power superior features. HF & MF broadcast stations can be very troublesome! i FIEVCO also make a full range of mobile antennas for frequencies from 27MHz to 950MHz. and new products arc constantly under development Contact your local Dealer or in crise of difficulty write, phone or fax Trade enquiries welcome

Revco Electronics Ltd, Old Station Yard, South Brent, S Devon TO10 9AL Tel: 0364 73394 Fax: 0364 72007 BEANTIN ANTENN A

isolate the vertical element from the rest of the possible, tin the can at these points to aid aerial and provides a degree of weather protection attachment and then solder each radial wire into BEAN TIN for the feeder termination. position (see Fig 2). The next job is to connect the centre pin of a co- axial chassis socket onto the bottom end of the MOUNTING copper tube. This can be achieved in a number of Cut two 10cm pieces from the length of wood for antenna ways - such as using a (very!)large soldering iron use as stand-off brackets, then measure the width to connect the two together. or alternatively by of the lowest aluminium tube and cut two slightly attaching a piece of stout copper wire to a suitable under-size holes in each of the stand-offs - the fit S Sutherland, GM4BKV, solder tag (the other being soldered to the co-ax should be tight enough to support the aerial. socket centre pin) and then bolting the solder tag Screw a metal bracket to each of the wood stand- shows us how to re-cycle firmly on to the tube. In either case the metal offs and then secure these to the large piece of our rubbish and produce a should be cleaned thoroughly before operations wood. Push the copper tube through the bracket cheap and effective 15m begin, in order to make a satisfactory join. holes (Fig 3) and then attach the rest of the aerial Regardless of the fixing method, it is also advisable to the tube using a jubilee clip. antenna into the bargain to fit a static bleed resistor across the inner and Dig a hole about 20cm deep, place the mount in outer of the co-axial socket - a 100k, 2W component it and refill the hole, pressing the earth down with Aerial projects have, from time to time, been being perfectly adequate. your fool. Then, using suitable pegs, spread out initiated by some rather strange events and this The next step is to attach the six wire radials to the radial wires and secure them firmly as these project is no exception — in fact this particular the bean tin, so first cut the wire into 3.3m lengths. not only fulfill an electrical function but also serve design arose as a consequence of updating our Make six equally spaced marks around the as supports for the antenna structure. When bathroom! One of the items left over from this epic outside of the can, as near to the bottom as correctly installed, the base of the antenna should event was the shower curtain rail, comprising two be about a metre above ground so that the radials aluminium rods which fitted inside one another à are at an angle of 20° to the horizontal. la telescopic aerial. AERIAL TUNING RAW MATERIALS Tuning is achieved simply by varying the overall One of the two rods had a spring and disc length of the vertical element, this is done by assembly which locked it into place, the combination Jubilee clip loosening the lowest jubilee clip and sliding the being designed so that it could be fixed horizontally two tubes inside one another. SWR measurements between two walls by means of spring tension. will reveal when the antenna is presenting the best Having decided that a spare length of aluminium match and in practice il was found quite easy to tubing must be useful for something I had kept it, obtain a 1:1 SWR. never imagining that it would one day take to the Saw cuts air! CONCLUSION The project was prompted by hearing the The original antenna was fed with ordinary 5012 numerous Soviet radio amateurs who operate on co-axial cable, and using 100W I have been able to the 15m band with nothing more than a simple work DX as lar afield as Chile. Japan. India, ground plane aerial - probably because they are Tasmania. Canada and several parts of the USA. cheap and easy to build - so it was decided to Apart from the satisfaction of working distant home-brew my own version. stations there is no doubt that a great deal of fun Fig. 1 and pleasure can be obtained from such a home- CONSTRUCTION brew project - after all it is oneway of getting rid of The components needed are simple. inexpensive old bean tins! El and easy to obtain, consisting of: 3 Jubilee clips Fig. 1 (above. left) Tube clamping technique Fig. 4 Sketch of finished 2 Exhaust system 'hangers' for Ford cars Fig. 2 (below) Aerial base and radial attachment detail aerial 3 Lengths of aluminium tubing, each piece of Fig. 3 (above, right) Aerial support method different diameter 1 70cm length of copper tube 1 Baked-bean tin Fig. 2 1 Co-axial chassis socket 2 Metal L-brackets 1 Piece of wood 160 15. 6cm 70cm Copper Tube Wire for radials Pegs to hold the radials 43 x 1 m approx Car exhaust Taking the widest of the aluminium tubes first. Al.tube Cut six to eight equally spaced slots down into one Shock absorber end and then do likewise with the second widest tube. Insert one tube inside the other and place the jubilee clip over the slotted area as shown in Fig 1 and attach the remaining aluminium tube in the same way. Next, adjust the overall length of the assembly so that it measures exactly 3.3 metres in total, then lock the tubes together by Bean tin 70cm means of the jubilee clips. Copper rube. Take one of the car exhaust system hangers. place it on the base of the empty baked-bean tin and draw around the outside. Now cut a hole in the tin which is slightly smaller than the circle you have just drawn, then ensure that all the ragged Six radials' edges are rubbed down using a suitable file. Push the hangers over the end of the copper tube and then push the bean-tin over the hangers. When Six radials completed, this assembly serves to electrically

44 RADIO COMMUNICATION October 1989 NON- NON- MEMBERS MEMBERS MEMBERS MEMBERS

First Steps in Radio (ARAL) £4.41 £3.75 RSGB BOOKS Fun - F012 Technical Handbook (AMSAT UK) £5.65 £4.80 Guide to Oscar Operating (AMSAT UK) £2.94 £2.50 Amateur Radio Awards Book (3id Ed) £9.35 £7.95 Hints and Kinks for the Radio Amateur (ARAL) £4.12 £3.50 Amateur Radio Operating Manual (3rd Ed) £6.84 £5.81 History of ORP (Milliwatt Books) £9.88 £8.40 Callbook - RSGB 1989 £9.35 £7.95 Interference Handbook (API) £8.35 £7.10 G-ORP Club Circuit Book £6.54 £5.56 International VHF FM Guide (G3UHK/GBAuu) £3.29 £2.80 HF Antennas for All Locations £7.24 £6.15 Introduction to Weather Satellite Reception ££2 94 £2.50 How to Pass the RAE £6.47 £5.50 Joy of ORP (Milliwati Books) 11 35 £9 65 Ins and Outs of Repeaters £1.35 £1.15 Linear Op-Amp Handbook (Carr) £18.62 £15.83 Morse Code for Radio Amateurs £3.21 £2 73 Low Band DXing (ARAL) £9.35 £7.95 Practical Wire Antennas £8 09 £6 88 Morse Code the Essential Language (ARAL) £4.06 £3.45 Radio Amateurs Examination Manual £6,47 £5.50 Novice Antenna Notebook (ARAL) Out of Stock Radio Communication Handbook Vols.; .2 (PB) £13.82 £11.75 Operating an Amateur Radio Station (ARAL) £2.65 £2.25 Radio Data Reference Book (5th Ed) £9.59 £8 15 OSCAR 13 Handbook (AMSAT-UK) £6.06 £5 15 Teleprinter Handbook (2nd Ed) - Reduced to Clear £2.29 £1.95 Packet Radio Handbook (Tab) £13.53 £11 50 VHF/UHF Manual (4th Ed) £10.88 £9.25 Passport to World Band Radio 1989 (R01) £11 71 £9.95 World al their Fingertips £8.62 £7 33 ORP Notebook (ARAL) £4.12 £3.50 Radio Amateur Antenna Handbook (API) £800 £6.80 Radio Amateur DX Guide (ARCI) £4 12 £3.50 Radio Amateur Map of North America (ARCI) £3 59 £3.05 RSGB LOGBOOKS Radio Frequency Interference (ARAL) £4,12 £3.50 ( MY Awards (BARTG) £3 47 £2.95 Amateur Radio Logbook £2 65 £2.25 RTTY The Easy Way (BARTG) £3.47 £2.95 Mobile Logbook £1 37 £1.16 Satellite Anthology (ARAL) £441 £3.75. Receiving Station Logbook £4.46 £3.79 Satellite Experimenters' Handbook (ARAL) £7.94 £6.75 Simple Low Cost Wire Antennas (API) £8.53 £7.25 Slow Scan Companion (BATC) £3.47 £2.95 Solid Slate Design for the Radio Amateur (ARAL) £10.53 £8.95 RSGB MAPS CHARTS & LISTS Towards the Radio Amateurs Exam (Slam) £616 £575 Great Circle DX Map (card for desk) £0.59 £0.50 Transmission Line Transformers (ARAL) £8 18 £6.95 Great Circle DX Map (wall) £3.21 £2.73 Tune in the World with Ham Radio (ARRL) £4 12 £3.50 HF Awards List and Countries List £0,54 £0.46 TV for Amateurs (BATC) £2.02 £1.72 IAR0 Region 1 Beacon List £0.44 £0.37 USA Licence Manual - Advanced Class, ARAL £4.12 £3.50 Locator Map of Europe (wall) £2.17 £1.84 USA Licence Manual - Extra Class, ARAL Out of Stock Locator Map ol Europe (card for desk) £0.79 £0.67 USA Licence Manual - Technician Class.ARRL £4.12 £3.50 Locator Map of Western Europe (wall) £3,40 £2.89 World Atlas (ARC)) £4.67 £3.97 Meteor Scatter Data Sheets £3.91 £3.32 Vagi Antenna Design (ARAL) £11.71 £9.95 Software Register £1.18 £1.00 Your Gateway to Packet Radio (ARAL) £7.70 £6.55 UK Beacon List £0.44 £0.37 2MT Writhe - The Birth of British Broadcasting £16.24 £13.80 UK Repeater List £0.56 £0.48 25 Fun to Build Projects for Learning Electronics Theory £7.82 £6.65 World Prefix Map in full colour (wall) £3.38 £2.87 99 Test Equipment Projects (Tab) £12.88 £10.95

RSGB MEMBERS SUNDRIES (MEMBERS ONLY) INTERFERENCE SUPPRESSION FILTERS RSGB badge car slicker £0.81 Braid Breaker Filter £7.39 £6.28 RSGB belt (leather) £10 88 Ferrite Toroid (pack of 2) £3.14 £2.67 ASGO tie (coffee. maroon, green. blue - please state) £4.50 High Pass Filter for FM Broadcast Band 2 £7.70 £6.55 RSGB teeshirts (medium, large, ex.large - please state) £5.15 High Pass Filter for UHF TV £7.47 £6.35 RSGB 'Green Book' (details structure. organisation and Notch Filter Tuned to 14MHz £7 70 £6.55 objectives of the Society) £1.20 Notch Filter Tuned to 21MHz £7.70 £6.55 Standard callsign lapel badge (5 weeks delivery) £2.95 Notch Filter Tuned to 28MHz £7 70 £6 55 De-luxe callsign lapel badge (5 weeks delivery) £3.34 Notch Filter Tuned to 50MHz £8.27 £7.03 Standard lapel badge (ASGO emblem, pin fitting) £1.36 Notch Filter Tuned to 70MHz £8.27 £7 03 Mini lapel badge (RSGB emblem, pin fitting) £0.91 Notch Filler Tuned to 145MHz £8.27 £7.03 Members' headed notepaper (50 sheets) quarto £2.81 Notch Filler Tuned to 435MHz £6 78 5.76 Members' headed notepaper (50 sheets) octavo £1.50 RSGB Filter Kit £51.00 £43 35 T 8 R Bulletin July 1926 souvenir copy 5.o.45 Six Section Filler lor UHF TV £20 29 £17.25

MISCELLANEOUS LANGUAGE AND MORSE INSTRUCTION AIDS Car sticker 'Amateur Radio» (2 colours) £0.81 £0.69 CW into Foreign Languages (VE3EIM, VE3MGY) Out of Stock Car sticker 'I Love Amateur Radio' £1.14 £0.97 Radio Amateurs Conversation Guide (0H1BR) £5.65 £4.80 Car sticker 'I'm on the air with amateur radio (4 colours) £0.93 £0 79 Dutch Supplement to Conversation Guide £1.41 £1.20 Car sticker 'I'm monitoring .5. are your (2 colours) £0.81 £.0 69 French Cassette Supplement to Conversation Guide £5.77 £4.90 Radio Communication back issues £1.47 £1.25 German Cassette Supplement to Conversation Guide £5 77 £4.90 Radio Communication bound volumes £22.69 £19.29 Russian Cassette Supplement lo Conversation Guide £5 77 £4 90 Radio Communication bound volumes 1977-88 From £10.40 Spanish Cassette Supplement to Conversation Guide £5.77 £4 90 Radio Communication Easibinder £5.82 £4.95 RSGB morse instruction tape (to 5wpm) £5 04 £4.28 RSGB HF contest log sheets (100) £3.87 £3.29 RSGB VHF contest log sheets (100) £3.87 £3.29 MAGAZINE SUBSCRIPTIONS OST (including ARAL membership). OTHER PUBLICATIONS One year - surface mail £27.94 £23.75 All About Cubical Quad Antennas (API) £7.00 £5.95 Two years - surface mail £53.37 £45.36 All About Vertical Antennas (API) £7.65 £6.50 Three years - surface mail £79.52 £67 59 Amateur Radio Computer Networking Conference Papers One year - air (KLM) W.Europe only £88.24 £75.00 (ARRL):Vols.1-4 £18.10 £15.39 Ham Radio Magazine. one year. by air £2200. £22.00 Vol.5 Out of Stock Vol.6 Out of Stock Vol.7 Out of Stock Amateur Radio Satellites - The First 25 years (AMSAT-UK) £4.65 £3.95 NEWSLETTER SUBSCRIPTIONS Antenna Compendium Volume 1 (AR M.) £10.76 £9.15 Connect International (monthly) £9.35 £7.95 Antenna Notebook, WI FB £7.82 £6.65 DX News Sheet (weekly) £21 77 £8.50 ARAL Antenna Book £13.71 £11.65 Microwave Newsletter (10 issues per year) £7 94 £6.75 ARAL Handbook 1989 (hardback) £16.41 £13.95 Rayne' News (6 issues per year) £5.82 £4.95 ARAL Operating Manual £13.65 £11.60 6 Metre arid Up DXer (monthly) £9.35 £7 95 AX25 Amateur packet radio link-layer protocol (AR M-) £6.76 £5.75 Beam Antenna Handbook (API) £8.53 £7,25 Newsletter subscription rates are those for subscribers in the UK and countries in the Better Short-wave Reception (API) £5.87 £4.99 EEC. For rates to other destinations please contact the Circulation Department al RSGB. Callbook - International Listings 1989 £19.41 £16.50 from where free sample copies of newsletters can also be obtained Callbook - N.American Listings 1989 £19.41 £16 50 Care 8 Feeding of Power Grid Tubes (Varian) Cut of Stock Complete ()set (Idiom) £8.47 £7.20 Complete SW Listener's Handbook (Tab) £15.24 £12.95 RAYNET SUPPLIES DX Edge (HF propagation aid) £21.07 £17 91 DX Power: Eflective Techniques £9.29 £7.90 Raynel Badge - Embroidered £1.04 £0.88 FCC Rule Book. (ARAL) £7 00 £5 95 Raynet Badge - Lapel £0.89 £0.76

Members visiting HO are advised to telephone first to confirm availability of goods - 0707 59015.

RADIO COMMUNICATION October 1989 45 NON- NON- MEMBERS MEMBERS MEMBERS MEMBERS

Raynet Badge Clip £0.50p £0.43p Hardware, PCBs 8 Laminates Raynet Car Sticker - Circular £0.65 £0.55 G4DDK 1152MHz Amplifier Board £4.11 £3.49 Raynet Identification Slicker £0.51 £0.43 6400K 1152MHz Local Osc Source PCB (RC 2-3/87) £3.87 £3.29 Raynet Manual, 1986 Edition £3.41 £2.90 CET-40 Mounted Termination. 40W, 50ohm £22.29 £18.95 £0.99 £0.84 Raynet Poster £0.98 £0.83 CuClad 233 PCB, 0.005", 2 > linch block Raynet Tie £5.83 £4.96 CuClad 233 PCB, 0.031", 2 ii 1inch block £1.46 £1.24 Regulator PCB (RC 10/81) £2.50 £2.13 UHF Source PCB (RC 10/81) £7.06 £6.00 WG20 Copper Waveguide (per foot) £7.14 £6.07 MICRO WAVE COMPONENTS

Capacitors Semiconductors £14.39 £12.23 1000pF Coffin Capacitor (pack of 10) £1.08 £0.92 DC1501E Mixer £10.88 £9.25 Trimmer for G4DDK 1152MHz boards £0,99 £0 84 M04901 SAD MGF1302 GaAs FET £8.18 £6.95 Exciters uPB581C 2.6GHz Divide by 2 Prescaler £8.02 £6.82 GOHM32 Doppler Module £74 06 £62.95 iiPB582C 2 6GHz Divide by 4 Prescaler £8.02 £6.82

HOW TO ORDER

NON-MEMBERS Use left hand price columns Note that members* sundries are only DELIVERY G oods will be despatched to UK destinations by 2nd class letter post or available to members of RSGB parcel post, or surface mail to overseas destinations. Please contact RSGB Headquarters for 1st class letter post or airmail rates. We normally despatch goods within 60 hours aller receipt 01 an order, but as delays can sometimes occur please MEMBERS Use right hand price columns 11 is essential that you quote your callsign or allow 28 days before enquiring about non-delivery ut goods Rs number so that you can be recognised as a member

PRICES rhese include postage. packing, and VAT (where applicable) and are subject to ORDER FROM: change without notice

AVAILABILITY Goods are available less postage and packing Dom RSGB Headquarters RSGB SALES (CWO) between 9 15am and 5.15pm Monday to Friday However you are advised to confirm. availability ot goods by telephone before visiting Headquarters. We attempt to keep Lambda House, Cranborne Road, ample stocks of all our sates items, however as this list has to be prepared several weeks in advance we cannot guarantee that any item on this price list is immediately available. Potters Bar, Herts, EN6 3JE

PAYMENT Payment may be made by post enclosing a cheque or postal order These should be crossed and made payable to 'Radio Society of Great Britain If sending cash please use registered post You may liso your credit card for payment by post or by telephone. We accept Visa. Access iMastercharge), American Express, and Diners Club NSA cards. Our telephone number for orders is (0707) 59015 (24hrs) Our Giro account number is 533 5256

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.16 RADIO COMMUNICATION October 1989 Simple 20m beam antenna F Webb, GOCEK, and W Johnson, G4CNK, put their heads together to produce this simple yet effective 3-element 20m beam

Many projects today seem difficult and expensive. elements stretched between the house facia eyes are run into the house lacia board for the This one is neither and can be built by anyone board and a rope suspended on posts fastened to halliards or short ropes which support the other whether an experienced constructor or not. All the boundary fence (Fig 1) It is a full-size beam, end of the elements, again via insulators. As the that is required is some 300ohm slotted ribbon with a driven element length of 331t for 20 metres. elements are not the same length, these ropes are feeder, ordinary wire, perspex sheet, nylon (or The reflector and director are 35ft and 3211 used to set the centres of the elements in line polypropylene) rope, and some lengths of timber. respectively, and the effective boom length is 24ft. before tensioning them with the halliards at the The average amateur usually cannot improve No actual boom is used, and if the available space support rope end his station's performance by modifying modern, is small, the length could be reduced to 14ft The driven element is a folded dipole made from efficient transceiver equipment. However, worth- (element spacings of 0.1 wavelength), or the 300f/ slotted ribbon feeder. The perspex centre while improvements can be obtained by attention element ends could be bent downwards. In our insulator is shown in Fig 2. The two slots in each to the antenna system. If a 5011 tower and case, the facia board was about 15ft above the end are made to be a tignt fit for the 300f1 ribbon commercial beam is not available, this project ground. but any increase in height would be an element. Pass the ribbon through the end slot. could provide a good substitute. The antenna's advantage. then double it back through the inner slot. Anchor performance will be interesting, and possibly the top two leads to the centre bolt and solder in exciting compared with the usual dipole or end- CONSTRUCTION place. Similarly fasten the lower leads to the f ed wire! Although the beam is fixed in one chosen If the beam is to point parallel to the house, the two remaining bolts, using solder tags if required, and direction, it will take a very long time to work out support posts should be fixed to the fence or other fill the slots with glue to make a strong mechanical all the stations along that bearing. The bandwith suitable supports at least 24ft apart (27ft if you joint. Twist the far ends of the element together of the antenna permits operation over the whole of want to reverse the direction of the beam), and at and temporarily fasten them to the insulators until 20 metres without adjusting the ATU, unless very least 36f1 from the house. The support rope is resonance checks have been completed. Put a low VSWRs are needed at the transmitter. The stretched between the posts on pulleys so that the short wire link across the terminals A-A for beam can be designed for other bands using the antenna can be lowered for easy adjustment. The coupling to the grid-dip oscollator. The ends of design formulae shown below. elements are fastened with insulators to halliards the other elements are simply passed through run through loops tied in the support rope. The their insulators and made secure. SPACE REQUIRED, ELEMENT position of these loops sets the element separations LENGTHS AND HEIGHTS as shown in Fig 1. The halliards will work more RESONANCE CHECKS Our 20 metre antenna was erected in the back smoothly if plastic rings are fastened to the rope in Hoist the driven element on its own to a height garden which is 36ft long and 28ft wide, with the place of the loops, but this is not essential. Screw where the centre is still accessible with a step-

Fig. 1 Mounting details for the 20m antenna. L e• loops or plastic rings, House fascia board S = spare loops or plastic SE E E SE E rings. X x X P = post, I L rrrl inn I=Insulator, E:eye, SE: spare eye. x. slot in Perspex 3 x brass bolts DEI

Fig. 2 Driven element C O connection details

Perspex sheet Approx tap position 2h-6mn

Spreaders at lft intervals

4 approx 171 t

300.f? feeder to a tu

Ends left open

RADIO COMMUNICATION October 1989 47 BEAM ANTENNA ladder. Couple the grid dip oscillator to the centre houses all around and transmissions have been link and tune carefully for a dip. Check the made at all times of day using around 100W frequency against the station receiver, as this is output. In addition to a low TVI profile, and much more accurate than the grid dip oscillator. If because all the wires ran parallel to the garden, the frequency is low, trim a little off each end of the Low-Z the antenna has a low visual impact — not looking element until resonance is obtained at about the least bit unsightly. 14.15MHz. which will provide a good compromise A for both CW and SSB operation. In our installation. AN ALTERNATIVE DIPOLE AND the final length was exactly 33f t. and if resonance FEED checks cannot be made, an element cut to exactly After very strong winds during which the stub took this length should be suitable. When all is correct. High-z a beating, we decided to remove it and connect permanently solder and glue the ends of the the feeder directly to the centre of the driven elements to their insulators. Remove the link from element. A third wire was woven through the slots the centre of the driven element. Fig. 3 Current distribution on a quarter-wave open. of the ribbon dipole and connected to either end circuit stub of the dipole element to make a three-wire folded dipole (Fig 1). The match was still very good with load and connect the feeder to the same taps. the ATU set for a 30011 load, although this may not IMPEDANCE MATCHING Using crocodile clips, connect the other end of the ARRANGEMENTS be true for antenna heights other than ours. feeder to the tuning stub about 21t below the However, the antenna and feeder can be tuned for Whilst a folded dipole at least a half wavelength driven element. Hoist all the antenna elements to a match between the transmitter and feeder above ground should theoretically provide a good their working height. terminals using the ATU. match to a 30011 feeder, in this case the antenna is Without touching the ATU settings, adjust the low, which with the presence of the other elements position of the feeder on the stub for the lowest NOTES FOR EXPERIMENTERS greatly reduces the input impedance of the dipole. SWR. Note the SWR, then cut a few inches off the The basic antenna was dimensioned as follows, One way of achieving a match is to tap the feeder stub and repeat these two steps until the best SWR and can be scaled for other frequencies. The on to an open-circuit stub, which has the advantage is obtained, then solder the feeder in place. In our wavelength is given by Lr-:984/F ft. or about 70ft at that the input impendence need not be known as case the stub length was around 12ft when tuning 14MHz. The reflector, driven element and director the match can be obtained experimentally. Fig 3 was complete. Use an insulator to secure the free were cut to 492/F, 468/F and 450/F respectively. shows the current distribution on a quarter-wave end of the stub to a stake, but note that high with a reflector to driven element spacing of 0.2 open-circuit stub. The impedence is low at the voltages will be present at the bottom of the stub wavelengths. The director was placed 0.15 wave- antenna and high at the open end, and somewhere when transmitting, so make sure that il cannot be lengths in front of the driven element. along the stub there will be a 30011 point to touched accidentally. The folded dipole gives the The element spacing could be reduced to 0.1 connect the feeder for a good match. Antenna antenna a fairly wide bandwidth, and we found wavelengths, and if space is short, the ends of the reactance can be compensated for by adjusting that it was not really necessary to adjust the ATU elements could be dropped down or folded to the stub length as described below. The stub can for transmissions anywhere in the 20m band. reduce the span, although in either case, the be of any convenient (high) impedance. Our stub bandwidth will be smaller and the stub adjustment was made from 22swg wire spaced about 2 inches RESULTS AND GENERAL POINTS may be more critical. The optimum element apart with perspex spreaders held in place by The test configuration was as follows: beam lengths will be different. although References 1 small pieces of wire soldered to the stub. The direction was fixed at 240 degrees (magnetic), the and 2 contain useful information about this. A two impedance was about 60011, and a quarter wave- transmitter was an old Labgear LG300 with a KW element beam would still provide useful gain if length stub of this type is around 17ft long for 20 low pass filter, the receiver was an ARBB with space is at a premium. If 50 or 7511 twin feeder is metres. Solder the stub to points A-A (Fig 2) and headphones and CW was used throughout the available, an open wire dipole could be used for bind the wires to the insulator with cord passed tests. Performance was found to be much better the driven element, although a broader bandwidth through suitably placed holes. than dipole and end-fed antennas which were at can be obtained with a folded dipole fed with 30011 Any length of 30011 twin feeder can be used to greater heights, and at times multiple replies ribbon feeder. connect the antenna to a balanced antenna tuning resulted from CO calls. Over 500 DX stations were The beam direction could easily be turned unit at the transmitter, as the antenna is matched worked between May and August 1987. including through 180 degrees by providing extra loops and to the feeder. Details of our ATU are shown in Fig five VK stations, three ZL and many VE, USA and halliards in the support rope and extra screw-eyes 4, where C1 was 100pF per section, although a South American stations. A PV station was at the house facia board at the correct spacing as 50pF unit with wide spaced plates will do. The worked several times over a few days, and a report shown in Figure 1. It would then be a simple matter whole capacitor must be carefully insulated from from a PT was just one S point below another G to lower the reflector and director and move them ground, and the tuning knob connected to the station using a linear amplifier, tower and beam to their alternative positions. If space permits. the spindle by an insulated shalt or other arrangement. antenna. beam can be set at any angle to the house, but the C2 can be 200 to 300pF, and the plates need not be Initially, some TVI was caused at the adjoining distances between the loops and the lengths of wide spaced. Li was a 12 turn centre-tapped coil house in the beam direction, but this was cured by the support ropes will depend on the angle about 2 inches long on a 2.5 inch former. with 3 a filter in the television downlead. No other chosen. A good sketch of the layout would help in turns of well insulated wire wound round the problems have occurred, although there are working out the dimensions to ensure that the centre of the link L2. The centre tap of I. 1 should element centres are in line and at right angles to be connected to the station earth, as the antenna the elements. has no other earth leakage path to prevent the 300S? feede to stub buildup of static electricity. Coaxial cable to IN CONCLUSION transmit ter It is hoped that this article will steer the reader towards thoughts of installing a fixed-beam HF ATU AND STUB ADJUSTMENTS Vagi antenna. While theoretical design is compli- The antenna tuning unit is first adjusted for a cated, we have described a practical design that match into a 300ohm dummy load. A low wattage has been proved to work. The builder is not carbon resistor with crocodile clips will do if restricted to making an exact replica of the suitably low powers are used during tuning. Place original, and construction can be adapted to an SWR meter between the transmitter and the individual requirements. Planning permission may ATU and connect the load resistor to taps which not be required although this should be checked are equally spaced either side of the centre tap on with the local authority. CI L1. Tune the transmitter to 14.15MHz then adjust C1 and C2 and the coil taps in equal steps either REFERENCES side of the centre until a match is obtained. Note (11 The ARRL Handbook the dummy load lap positions on L1, remove the Fig. 4 Suitable ATU for the antenna )21 The ARRL Antenna Handbook

48 RADIO COMMUNICATION October 1989 PREVIE W

W HERE TO STAY If you're planning to stay in a hotel, here are some you might like to consider. First of all, block bookings have been made at the Grand Hotel in Granby Street and a room there costs £28.00 per person per night. The telephone number is Leicester 555599, the STD code being 0533. Then there's the Alexandra Hotel in London Road: £26.50 per night for a single room and £36.00 for a double or twin. English breakfast is thrown in, and they're on Leicester 703056. Next comes the Post House in Braunstone Lane, which will do you a single room for £18.00 and a double for £24.00; here again you get a free English breakfast. This establishment is on Leicester 896688. Finally there's the Belmont Hotel in De Montfort Street, where a special show price for TWO nights has been negotiated. For bath, bed, breakfast and dinner it costs £62.00 per person; book up on Leicester 544773. If you book at any of these hotels, do remember to mention that you're taking advantage of the Leicester Amateur Radio Show block booking - otherwise you'll pay rather more than the conces- sionary prices listed above. Leicester Show Preview FAST LANE SMC have a new rig '...for the amateur who lives in cannot be heard in the noise! In contrast, packet larger than a packet of King Size cigarettes'. the fast lane' (?). Be that as it may, the rest of the requires signals good enough for speech com- Siskin tells us that packet radio is much safer than press release said 'SMC are proud to introduce the munication before it will work at all.' They goon to smoking, so it won't carry a government health introduction of the FT1000, a dynamic HF trans- say that the AMT-3 is a low-cost AMTOR/RTTY warning, but the new box - which is apparently ceiver designed exclusively for elite world-class terminal unit which ',..incorporates only those code-named 'Le TNC' is essentially a miniature contest and DX operators. The FT1000 is the modes which are useful for HF data communica- version of the popular PacComm Tiny-2 and it's culmination of a three-year design effort to tion... An excellent tuning indicator is incorporated, designed specifically for use with hand-held address the many shortcomings of other manu- as well as full status indication for AMTOR'. wirelesses of the Icom 2E/4E, Kenwood TH series facturer's top-of-the-line products. The result is a Apparently the firmware of the AMT-3 was designed and the Yaesu FT family. Features will apparently dominating tool...features may include dual receive by Peter Martinez, G3PLX, who's more or less the include the PacComm Personal Message System, with two tuning knobs, balance control for dual father of AMTOR. so it ought to be pretty good. full TNC2 capability (including provision for NET- receive, dual frequency displays, standard filter Together with the unit itself, you get split-screen ROWTheNet), a metal cabinet for full RF screening bandwidths of 2400, 2000, 500 and 250Hz, direct host mode software for the IBM PC thrown in - all and conventional RS232 connections. Additionally digital synthesis and narrow-range PLL sub-loops for £169.95. there's a ni-cad battery option and a '...family of for low phase noise and a fast-acting auto- support accessories such as higher-speed modems tracking ATU'. Go for it, all you elite world-class HANDY SCANNER including the G3RUH 9600 baud modern'. Siskin contest and DX operators. Me, I just want to go on Waters & Stanton will be showing a number of new couldn't quote a price at presstime but said that 3.5MHz and moan about the weather so I'll products, including the Jupiter II hand-portable 'Le TNC' would retail in the UK and Europe at obviously have to wait for the FT 3 and a quarter. scanner covering 25-550 and 800-1300MHz at £299 '...under £200'. and the companion Jupiter Mobile/Base scanner CHEAPER AMTOR covering 25 to 1300MHz (*below £400'). They'll GIRM ELIMINATOR ICS Electronics is showing the new AMT-3. In a also have the Mizuho 10W HF amplifier, which The Isle of Man-based company SEM Ltd will be press release, the company said 'Until recently, it matches the 2W SSB/CW transceiver. Two versions showing its 'ORM Eliminator' which apparently has been relatively inexpensive to become active are available, single-banders covering 3-5, 7 and allowed W4CXH to report that '... the power line on packet radio but much more so to become 14MHz and a wideband job for 3-30MHz. There noise is Si and your are coming through 5 and 4'. active on AMTOR. The normal route has been to should also be some new items from Alinco on Remarkable. use a relatively expensive multi-mode terminal show. unit such as the AEA PK-232. AMTOR is far more YOUR SOCIETY suitable for HF communication than packet, TINY TNC RSGB - well, what can we say about quite the best frequently giving error-free messages when signals In a last-minute fax to HO, Siskin Electronics said national amateur radio society in the UK? We'll be that they'd be launching '...a completely new there in force, of course, with lots of books and Yam's new top range FT1000. concept in amateur radio: a hand-held INC no other items for sale and staff from Membership Services to help you with any problems.

CLEVER KITS C M Howes Communications will be unveiling the latest addition to their kit range. They said that this '...is a frequency counter which can be used as a digital readout for receivers, transmitters and transceivers built with Howes kits. The display has five digits and can be selected to show 100Hz or 1kHz resolution on any band between 1-8 and 30MHz. The circuitry has been designed to minimise 'digital noise' and can therefore be installed in the same case as a receiver without the EMC problems this often causes. With the addition of this new kit to the Howes range, it is now possible to build a receiver or transceiver with all

RADIO COMMUNICATION October 1989 49 PREVIE W

from stock. John Badger will also be showing a 'Docking booster' for handhelds range of preamp kits, the 'Scanner Vox'. a 144MHz from Nevada. amplifier and various other items will be available — and there'll also be a demonstration of computer- aided design of PCBs. We saw a Badger board the other week and must say it was beautifully made - a lot nicer than some so-called 'professional' ones we've come across...

TEN TEC TASTY Fred Rendell and the gang at 1-IRS will be showing the new Ten-Tec Omni VHF transceiver which we mentioned last month - very tasty.

SSTV AND FAX A cheaper way into AMTOR from ICS. Technical Software will be coming down from the major front-panel features normally found on Caernarvon to show their new GX-2 fax and SSTV factory-made equipment. Designated the F05, a transceive system. Apparently the fax has '...full demonstration unit will be available at the show 320 x 256 pixel definition with 7-level grey-scale. for visitor's inspection'. Sounds nice - we really full or quarter-screen transmission at all 10Cs must get round to trying some of these Howes kits with phasing signal and stop tone... Reception at some time and tell you how we get on. any speed, picture reverse and screen dump to show this year. printer. Optional direct printout of received signals it is neverthelss 'a bit of an occasion' for them. To celebrate the first anniversary 2/10 M TRANSVERTER with auto phasing for top-quality charts and of the launch of the AMR1000S, they're running a R N Electronics said that they'd be launching a pictures'. For SSTV you get '...colour and monoch- special offer: if you buy an AMR 1000 or AMR 1000S 2/10 metre transverter with 25W PEP output. The rome transmission and reception, complete com- at the show you'll gel a free extension speaker spec says that the second harmonic is better than patibility with existing Robot colour, line sequential (worth £11.44) and a free 2m antenna (worth -70dB and spurii are better than -60dB; intermod colour and mono equipment and automatic oper- £14.99). is quoted as'-32dB' (it didn't say which order and ation in Robot mode. All timing standards are with reference to what) and the noise figure is supported. Flywheel synchronization to combat better than 2-5dB. There are also masthead noise and QRM. screen dump to printer and lots of MUTEK Last exhibitor to send in some stuff to us was the preamps for 70, 144. 430 and 934M Hz. Apparently other features'. The press release adds a lot more reincarnated muTek. now doing very nicely in the '...The power handling is up to 200W with a low detail and the GX-2 certainly sounds amazingly hands of Mike, G6GEJ We mentioned the new noise figure of less than ldB. The gain of these clever. If fax and SSTV is your thing, you can get front-end board for the IC202 last month, and now preamplifiers is set to give the best compromise one for £99 - or £119 including the fax direct the TVVF50c 50MHz transverter is back in Mk11 between system noise figure and system intermod- printing option. Technical Software is run by guise. This has 25W PEP output, as opposed to the ulation performance'. No doubt they'll be glad to Richard Wilmot, GW3RRI, and an exceedingly 10W of the earlier model, and other figures have give you more info on the stand. bright chap he is too - we've used some of his software in the past and been most pleased with it. been improved too; the output 3rd-order intermod BOOST YOUR HANDHELD intercept is 5dB higher at +60dBm and the spurii are further down. As we went to press, the Nevada are showing a couple of 'docking boosters' which increase the power of a VHF handheld to MODULAR KITS following muTek products were listed in their 25W. It says here that 'By sliding the handheld A new name at Leicester this year is Jandek, who catalogue; TVVF50c and TVVF144a transverters for 144/50 and 28/144MHz respectively, the radio on to the unit, the handheld is converted into will be showing a range of kits. The press release a mobile or base radio that may be used at high or said that Jandek kits have been designed to SLNA433sp 430MHz masthead preamp with 12dB gain and 1-3d8 noise figure. two low-noise low power. For mobile use, the 'docking booster' encourage construction amongst radio amateurs is supplied complete with a fixing bracket for and listeners and that a modular approach has preamplifiers for 144MHz and replacement boards for the FT221, F1-225, IC211 and 251, IC271 and installation in a car. At home, the unit may be been adopted so that the various items can be the IC202. Incidentally, the muTek catalogue said powered from any 12DC mains adaptor' (really? used with each other or with the constructor's own that the new front-end board for the IC202 would the spec says it needs 13.8V al 6A, which circuitry. Amongst those available are two audio means a moderately beefy amplifiers. the JDO01 and JD006; these are based be available from 30 October 1989 if there were no PSU - Ed). Model BS25 is on the LM380 IC and produce about 0-7W into snags during initial production, but no doubt Mike will tell us the latest on his stand. designed for the Icon) IC2E, 8ohms from a 12V rail - just the thing for an RX. CT E CT1600, Kenpro and There are also two active audio filters. the J0002- similar models. Model BS23 C for CW reception and theJDOC/2-S for SSB. Both ANTENNA PEOPLE By way of a final, we had occasion recently to visit is for the Yaesu FT23 and use the TL074 low-noise JFET quad op-amp in a similar machines. The spec six-pole low-pass filler configuration. Cut-off Dee Comm - the antenna and metalwork people in says that both units over frequencies are typically 1120 and 2560Hz respec- the West Midlands - and 1 must say I haven't come across such a pleasant and helpful bunch for ages 1400-174MHz and give 25W tively. The JDO03 is a product detector module output: input power is based on the MC1496 double-balanced mixer and and ages. I happened to need some distinctly non- quoted as 3-W. Both mod- the JDO04 is a VFO based on a BF256 in a Colpitts standard alloy tubing and fittings, most of which they didn't have. But they went to great trouble to els cost £59.95. arrangement, followed by another BF256 as a buffer and a tuned 2N2222 buffer. This VFO can be locate a supplier and got the tubing on the BADGER supplied to cover any single amateur band from following day! I had the distinct impression that if BOARDS 1-8 to 14MHz and the output can be fed directly they didn't have it they'd either find it or make it. Badger Boards of Sutton into the JDO09 broadband amplifier using a We don't know what the/II be showing, but it'll no doubt be good - if you need anything for putting Coldfield will be showing BSX20 to form a simple CW transmitter. There's the full set of PCBs for more - pop along to the Jandek stand and talk to antennas up, try them. the G3TXQ transceiver; the proprietor, Derek Pearson, G3ZOM. they're ready-drilled ...ALSO PRESENT and roller-tinned and By press-time we'd gathered that Newton Engraving. all seven are available NAVICO BIRTHDAY Quartslab. JMA Power Supplies, 04 Keys and Navico have been in touch to say that although MFM Supplies will also be at the show, but we

Jupiter II handy scanner,. they won't be launching any new products at the didn't know which stands they'd be on.

50 RADIO COMMUNICATION October 1989 High performance technology made simple

enuine high performance technology that is this • Clear signal strength numerical read-out Gsimple to use takes a special kind of expertise. • Variable LCD illumination In the AMR1000, Navico has produced what so • Simple connection to Packet Radio TNCs many radio amateurs have been waiting years for - without internal modification a superbly designed, no-frills transceiver that offers The simple quality and attention to detail make this sheer quality of performance for those who are more the most exciting British-designed and British-made interested in communicating simply and clearly than contribution to amateur radio this decade. in playing with complicated electronic gadgetry. Those who are looking for the same basic quality, The AM R1000 is the product of the very best in but with a more sophisticated set of features, will find user-conscious design. New corners to 2m will find the that the AMR1000/S fits the bill. operation is pitched at exactly the right level to give the To find out more about Navico 2m transceivers, and ease of operation they need, without unnecessary discover why they are simply the best available, just complications. More experienced operators enjoy the complete and return the coupon. versatility and ergonomically designed accuracy of a rig It's as simple as that. that according to Chris Lorek of HRT "...makes SEE US AT LEICESTER — STAND E I Japanese black boxes appear rather limited." The list of features is impressively functional and PRIORITY INFORMATION REQUEST includes:- For full details send to: Navico, Star Lane, Margate, Kent CT9 4NP, • Reversible angled front panel that is 1 . Telephone: 0843 290007. conveniently visible however mounted Name ItC 10 89 • Clear, well-spaced switches Address • New fist microphone with channel change facility Tel • Frequency and channelised operation 1 The professionals in amateur radio giving fully automatic repeater operation LEICESTER SHO W

Well, it's that time of year again - time for that hardy annual, the Leicester Amateur Radio Show. This year's extravaganza (which is now in its eighteenth year) takes place on Friday 27 and Saturday 28 October, and as usual the venue is the Granby Halls in Aylestone Road. The 'Leicester Show' is organised by the Leicester Amateur Radio Club and supported by all the clubs in Leicestershire; surprisingly enough it's a non-profit-making event and the surplus is distributed around the local clubs according to their level of participation in the event. Some 5000 visitors are expected to pass through the imposing portals of the Granby Halls, and as usual there's a large trade show. In addition, Leicester ARS is organising a bring-and-buy and the Leicester Repeater Group is running a raffle. Access is easy - the venue is not a million miles from Junction 21 of the Ml, and the Granby Halls are only a short walk fromtalk-in thewill railway be available station viaif you'reGB2GH planning on S22 toand go SU22.the civilised way - and e '\° Refreshment facilities will take the form of a cafeteria and \I\le bar and there are good facilities for the disabled.

EXHIBITION HALL EXHIBITION HALL EXHIBITOR STAND NO

Al Electronics 14 MAIN Amdat 15 ENTRANCE Ham Radio Today 10 Howes Communications 9a HRS Electronics 11 Icom 2 ICS Electronics 7 Jandek 9 Jaybeam 6 R A Kent (Engineers) 14a LMW Electronics 15a Lowe Electronics 12 Merlin Systems 8 Navico 1 Practical Wireless/ Short Wave Magazine 3 Procom (UK) 8a Rich Electronics 13 RSGB 4 Sandpiper Communications 5 Technical Software 14b T W Wraith 13a

52 RADIO COMMUNICATION October 1989 FLOOR PLAN AND SALES HALL EXHIBITOR STAND NO Altron Communications Equipment 32 EXHIBITORS Amateur Radio Communications 10 ARE Communications 41 Arrow Electronics 33 Astley Videos 45 Badger Boards 57 Barenco 26 J Birkett 27 BNOS 22 Bonex 64 Brial Services 43 CapCo 31 Computer Junk Shop 48 Dee Comm 60 Dewsbury Electronics 4 Display Electronics 13 Dressler Communications 18/19 Elliott Electronics 6 Gemini Electronics 1/2 1 29 34 Giacomelli 49 EXHIBITORS Greens Telecom 5 31 30 28 BAR AND Grosvenor Software 62 LOUNGE 2 27 26 35 53 Ham Shack 46 Heatherlite 20 53A Hilton Plant 53a J & P Electronics 37 36 37 38 JMG Electronics 16 54 JPE Computers 9 25 24 Alan Kelly Communications 25 39 40 55 KW Communications 21 22 23 Lee Electronics 53 56 M & B Radio 40 Marco Trading 34 41 42 21 20 57 MGR Communications 11 H Morgan Smith 23 17 18 19 muTek 17 44 Nevada 42 >1ElVd HVO S801.191HXa S801.191HXa HVO >1ElVd 58 43_ 45 46 New Cross 51 R.A.S. (Nottingham) 47 59 ENTRANCE Radio Shack 61 TO 16 Radiotronics 52 SALES 47 49 Raycomm Communications 36 HALL 15 RN Electronics 58 60 SEM 55 13 14 48 49A 6 SOS Electronics 35 Siskin Electronics 44 Sitek 59 61 South Midlands Communications 11 12 50 51 Spectrum Communications 29 COMMITTEE 62 Strumech Engineering 14 ROOM Syon Trading 30 63 8 9 10 TAR Aerials 54 64 Taurus Electronics 3 U MF 24 Waters & Stanton 15 Weirmead 12 Westlake 50 Wilson Valves 6a

RADIO COMMUNICATION October 1989 53 OPENING SHORTLY The KW 'EMPORIUM Stand by for the GRAND OPENING EVENT at The KW Technical Servicing and Mail Order out brand new amateur radio showroom and facilities will continue, as always, to be an service centre, opening shortly at Sandling, outstanding feature of our nationwide service near Maidstone. This fully operational and fully to enthusiasts. 35 years of experience is at your Meantime. stocked 'EMP ORIU M' will offer you the oppor- service! Visit us at L EiCESTER tunity to 'see, feel and try all of the popular a S TAND 21 SALES 0-iALL models from Kenwood, ICOM, Yaesu Musen, nd see the new Ten rec 'Omni and fun range TenTec, Navico and many, many other makes. STOP PRESS! OPENS 14 OCT! of rigs and accessories

CFD -er . \\\ irl,DC 111». i.i: ¡Li.

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TH08111 *ITN • •

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TENTEC OMNI V TRANCEIVER £I.900. AC PSU MODEL 961 £215. AVAILABLE FROM STOCK NOW!

TEN TEC Buttennut PARAGON Transceiver • General Coverage £1,839.00 HF6VX 6 Band Vertical Antenna £159.00 CORSAIR Il Amateur Bands 10-160M £1,200.00 HF2V 80/40m Vertical £142.00 ARGOSY II Mobile or Base HF SSB/C W £589.00 SC3000 30-512 MHZ Scanner Ant £63.99 CENTURY 22 CW Transceiver & ORP £399.76 2MCV 2M Colmar 9.6113db gain 53.99 TITAN Linear Amp 1.500W 10-160M £2,171.00 2MCV.5 2M Colinear 15.75115db gain £63.99 HERCULES II Linear Amp 500W 13.8V .. £839.00 Compact HF Beam HERCULES Il PSU 100 Amp £660.00 HF18 10-12-15-20M Butterfly (wingspan 126" Boom 6') £235.00 AllButternut accessories available Hy-Gain Antenna Range available KLM range of antennas available. AMP KW TRAP DIPOLES LINEAR AMPLIFIERS from USA. MTD 8KW Standard 400W PEP Trap Dipole 80-10M Three models available. Phone or write for details TBTO 400W PEP Trap Dipole 160M-10M £7171. 30 JTD 400W PEP Trap Dipole 10, 15.20 & 40M £56.70 TP80 KW Traps Resonating on 80M 400W. £23.00 ANTENNA TUNERS TP40 KW Traps Resonating on 40M £16.10 TP20 KW Traps Resonating on 20M £16.10 KW207 SUPERMATCH using the famous KW E-Z Match circuit - Co-ax & TDK Add on Kit for MTD to cover 160M £34.50 Balanced Pair Output £149.50 NEWI TD-WARC 400W PEP Trap Dipole 30. 17 and 12M £66.70 TEN TEC 2293 10-160M, 2KW £309.00 (All KW Trap Cecile Aerials supplied with 20 metres co-total cable & PL25911,661,:d) 0 MFJ 9898 3KW Roller Inductor £368.16 DBA 01 KW 1:1 Balun 3.30MHZ £16.10 9628 1.5Kw Cross Needle Meter £241.95 949C 300W Cross Needle Meter £157.75 9410 300W with SWR/PWR Meter £105.13 ROTATORS 901B 200W Versatuner £53.07 AFI40 Hy-Gain for up to 3 sq It wind load £168.72 CD4511 Hy-Gain for up to 8.5 sq It wind load £219.00 Also. Random Wire Tuner. 6-way Antenna Switch. Dummy Load 300W and I KW. HAM 1V Hy-Gain for up to 15 sq fl wind load £329.00 T2X Hy-Gain for up to 20 sq It wind load £399.00 HDR 300 Hy-Gain for up lo 25 sq ft wind load ANTENNA RANGE 2303 Sky-King Light Duty £3..14 Cushman A3 3 Element Tribander Beam £262.99 Lots more "Goodies" - Trade-in Equipment, Servicing, A3 4 Element Tribander Beam £353.35 10-3CD 3 Element 10m Monobander £115.04 EXPERT ADVICE is FREE. Write or 'phone for brochures. 15-3CD 3 Element 15m Monobander £139.70 Full range of Accessories, Microphones, Morse Keys. Mobile 20-3CD 3 Element 20M Monobander £238.21 Whips. HF, 2M, 70cm, etc. AP8 6 Band Vertical 2511 High £164.35 AP5 5 Band Vertical 2511 High £123.36 VISA, ACCESS, H.P. 18 Element 2m Boomer Antenna £106.59 16 Element 2m Boomer Antenna £85.26 All the above prices include VAT. Post/Carriage charged at Ringo Ranger 2m Antenna £42.95 cost. Orders of £200 or over, free delivery within UK.

Write, phone or fax for further details. KW COMMUNICATIONS LTD Vanguard Works, Jenkins Dale, Chatham, Kent ME4 5RT. Tel: Medway (0634) 815173 Fax: 0634 830986.

54 RADIO COMMUNICATION October 1989 working voltage - but you must also connect a disuse as much as the power-supply variety. STC IN PRACTICE resistor in series to limit the current through it. It's Capacitors suggest that components with a working also a good move to connect a milliammeter in voltage rating of 100V or less should not deteriorate series with the capacitor as well so that you can sufficiently to require re-forming for at least three This month we look at some more of your letters measure the leakage current (Fig 1). The value of years after manufacture under normal storage and consider some of the things we need to bear in the resistor should be chosen on the basis that if it conditions. However, they add that higher-voltage mind about heatsinks. Remember, by the way, was connected directly across the supply there components should be reformed after 18 months. that this is very much your column - which. would be about 50mA drawn; for a 500V working Many of the examples you see at rallies have a incidentally, will appear every month from now component we'd use a 10k resistor, tor example. date code on them, which should assist you in on. We'd much rather use the space to deal with This will limit the current flowing in the capacitor if deciding whether re-forming is necessary or not. your practical amateur radio-related problems it happens to be short-circuit or extremely leaky. than second-guess you and write reams about Equally, if it has high leakage current, some volts technical and practical matters which aren't will be dropped across the resistor and consequently Safe Operating Area necessarily what you want to know. So do keep a lower voltage will be applied to the capacitor. As 'Mulling over some back copies otRadCom. I rear) those letters coming; we'll do our best to find its leakage current falls during the re-forming an article in which the designer of a particular answers for you. The first one this month picks up process, the voltage across the electrolytic will circuit mentioned something called the 'safe on something in last month's piece about electrolytic gradually increase to somewhere near that of the operating area' (SOAR) of a power transistor. capacitors. supply. can't find any mention of it in my textbooks - can When you connect a suitable supply via a you tell me what it means and whether it's Reforming Electrolytics resistor and milliammeter to an electrolytic which important?' M W. Walton-on-Thames 'In your item about using electrolytics in series, hasn't been used for some time, you might well It's highly important, but even professional designers you said that if they were surplus or ex-equipment. see anywhere between less than 1 and more than occasionally come unstuck because they sometimes they ought to be 're-formed' before putting them 20mA of current indicated. This is the leakage forget about it. There are several ways of thinking into service. I've seen this mentioned several times current of the capacitor; whatever its initial value, about SOAR, but what it amounts to is this. in books and articles, but technical authors all too the important thing to look out for is thal it should Bipolar transistors are prone to a failure mode often throw away little phrases like this on the begin to decrease almost immediately unless it called 'second breakdown'. At high currents and assumption that we know all about these things. was only a few milliamps to start with. It's voltages the transistor junctions don't conduct What exactly is 're-forming' in this sense, and impossible to give precise figures because there equally over their entire areas and what are what's the mechanism by which it works?' are so many variables involved, but as a rule-of- colloquially called 'hot spots' start to form. These C S, Blackburn thumb the leakage current of an electrolytic are small areas carrying more current than the Basically, an electrolytic capacitor consists of should be in single figures of milliamps after ten or bulk of the adjacent structure. Because of this two aluminium foils interleaved with an absorbent fifteen minutes unless the capacitor is in a bad they get hotter, and in bipolar transistors this material - paper is the most common - and then way. I tend to think that after 30 minutes the unfortunately means that their resistance falls- so wound into a cylinder. This is then impregnated leakage current is about as low as it will ever be. they conduct even more current and get even with a suitable electrolyte and placed into a although you'll find that good-quality components more hot. And so on until the device fails. container, usually aluminium. When a voltage is often display extremely low leakage currents after Second breakdown sets a restriction on the applied across the foils, a dielectric layer of a few hundred hours' continuous use. simultaneous voltage and current that a bipolar aluminium oxide is formed on the surface of one Going back to last month's example of a 100pF transistor can handle. The manufacturer's data of them; this becomes the positive electrode, or 450V working component. I'd expect to find after sheet for a power device will give a maximum anode, of the capacitor. The electrolyte forms the about half-an-hour of re-forming that its leakage collector-emitter voltage, a maximum current and other plate, and has the secondary role of current was around lmA or less. A high-capacitance a maximum dissipation - but don't stop reading it repairing any flaws in the oxide film which appear low-voltage electrolytic will tend to have a higher at this point because these are emphatically not when the capacitor has a voltage applied to it. leakage current and take longer for it to reduce, the whole story. The data sheet will also contain a The oxide film which forms on the positive foil but look for a steadily decreasing trend on the family of curves which display voltage against when a voltage is applied during manufacture is milliammeter over a period of time. If you're down current for a particular time. In a way these are an insulator, and in a 25V working component it is to 10mA or so after 30 minutes, the capacitor more important than the simple numbers for volts only about 0.5µrn thick. For this reason, an should be perfectly reliable in normal service. and amps; the reason is that the area under the electrolytic capacitor has very high capacitance One last tip is that it's worth taking some trouble curves shows the regions in which you can use the for its size. The problem is that when a voltage is to make up a 're-forming' supply whose output device without it running into second breakdown. not applied to an electrolytic (when it is stored, for voltage is equal to the capacitor's working voltage. This is known as the 'safe operating area' which is instance, or if the equipment containing it is Particularly with the higher-voltage components, often referred to by semiconductor manufacturers switched off for a long period), the oxide film it's asking for trouble to re-form them at a lower as SOAR. formed on the anode foil gradually deteriorates. figure than their rating and then use them in a It's important to be aware of the concept of safe This is another way of saying that electrolytics circuit which applies the full working voltage. operating area whenever you use bipolar power which aren't used for a long period gradually lose That's another good way to blow up the shack! transistors, but the time to have a careful look at their capacitance. So if you leave one in your junk- It's sensible to re-form all electrolytic capacitors the SOAR curves is when you're thinking of using box for a long time and then want to use it for if they're anything other than brand-new, although a particular device as a pass element in a power something, you may find that the circuit which it is the smaller ones don't deteriorate with time and supply. In this case, you're interested in what the in doesn't behave properly. Equally, if you buy a data sheet usually refers to as the DC SOAR - the big electrolytic at a rally for use as the reservoir area under this curve shows you the maximum capacitor in a PSU, the component may not have Flg. 1 Circuit for re-forming an electrolytic capacitor. voltage you can apply between collector and been used for a considerable time and the same The resistor R Is chosen so that not more than about emitter when a particular current is continuously problems might arise. As well as an apparent loss 50mA could flow in the capacitor even If It was dead flowing. The other curves relate to repetitive pulse short-circuit, and also to reduce the voltage applied to operation for given 'on' times of the device, and of capacitance (especially noticeable in the small the capacitor when Its leakage current Is high — as when wire-ended variety), the leakage current of a long- the re-forming process is first started. The milliammeler they're important if you're using the transistor in unused electrolytic can be very high when it's first is to monitor the leakage current, some sort of high-speed switching application switched on; in severe cases this can lead to rapid internal heating, thermal runaway and a loud explosion.

•--, Reforming Circuit However, the process which led to the deterioration mains C to be can be reversed - and this is where 're-forming' reformed comes in. All you have to do is to apply a voltage across the capacitor which is equal to' its rated

RADIO COMMUNICATION October 1989 55 IN PRACTICE

good job of removing mains-borne interference in 7Z82377.1 I Region of permissible HF receivers. Some plug-in types which resemble 10 2 t I r cit. operation a 13A adaptor are also available, and we've seen II Permissible extension these at rallies for a few pounds; you plug them IC for repetitive pulse (A) 6 = 0,01 operation into the normal 13A socket and then plug the A Ill Area of pemessible equipment you want to protect into them. ICMmax operation during If your equipment has the common three-pin turn-on In single 'IEC' mains socket and there's enough room t transistor converters, available, you could replace the socket with one Cma x provided R. 100 II containing an integral filter. Have a look in the 20s and t, 0.8 ma. 10 11 IV Repetitive pulse Electromail catalogue, where they have a wide operation In this variety with different suppression performance 50 region Is permissible and current handling. provided V. 0 and 2 ms. For a little more money you can buy multi-way 100 distribution boards which contain integral filtering. These are very useful in the average amateur situation where several items of equipment need to be connected to the mains, and the filter 1 200 performance is usually superior to that of the plug-mounted variety. Most contain chokes in the III earth line as well, which is useful in cases where 500 interference is simultaneously carried on all three mains lines. In our experience, filters of this type 1 ms are essential if you live in a rural area where the supply comes in on an overhead line and it's a 2 PME system. Incidentally, we're still not happy about certain aspects of PME - which was 10-1 5 discussed in an article by Peter Chadwick. G3RZP, 10 a year or two ago in these pages - and we're planning to go into it again shortly. 20

d.c. Transient Suppressors BUS13 Most of the filters we've mentioned so far will BUS13 probably cure the microprocessor-crash syndrome 10-2 which affects not only the 251E but several other 10 10 2 103 Vc E rigs as well. The reason is not primarily their filtering ability -although that probably helps- but Fig. 2 The sale operating area (SOAR) curves for a BUS13A power bipolar transistor, which has replaced the because they also contain a 'transient suppressor' obsolescent BU208 In many applications. When any power transistor is used as a pass device in a regulated PSU, If Is in the shape of a voltage-dependent resistor or important to ensure that the applied voltage and current are Inside the area on the graph marked I —*region of permissible DC operation'. Failure to do so may result in the device having a very short life because ol 'second VDR. These are extremely useful devices, and breakdown'. This is due to the formation of 'hot spots' In the transistor's junction. Note that power FETs do not suffer we'll look at them in more detail in a subsequent In from this limitation. (Reproduction by courtesy of Muliard Limited). Practice. Suffice it to say for now that they act as a very fast-acting clamp to voltages in excess of the ones they're rated for, so they soak up spikes and glitches on the mains very well indeed. It's the such as a switched-mode power supply. Also, my Icon) IC251E sometimes seems to be latter which tend to cause microprocessors in rigs If you frequently suffer from strange failures of affected by surges on the mains and goes into a (and also in items such as video recorders and CD bipolar power transistors in a PSU, dig out the mode when the display goes on working but it players, not to mention the CMOS input switching data sheet and check that their working conditions won't receive or transmit. This seems to be in some hi-fi preamplifiers) to 'crash' and do are within the DC SOAR. It might bean enlightening especially triggered by our immersion heater strange things. My own IC251E used to get experience. Equally, if you're designing something switching on and off, although it misbehaves at confused by mains spikes and fall over at least for publication, make sure that you've checked other times as well. Are these things linked, and once a week, but since I fitted mains filtering and this point. For instance, the circuit on page 37 of can !do anything about them?'B T Northallerton. VDR protection a couple of years ago the problem Technical Topics in July 1989 (Fig 5) might not be If what we hear is anything to go by. problems has completely disappeared. Incidentally, any all that reliable in the long term. The reason is that caused by noisy mains supplies are becoming equipment containing thyristors or triacs for although the BU208A is only dissipating about more common - especially when the incoming phase-angle control also tends to be hyper- 7W, its working point is outside the DC SOAR for mains supply utilizes the so-called 'protective sensitive to noise and spikes on the mains - so if the device - according to the Mullard data sheet multiple earth' or PME system. Happily, mains- you have a clever home-brew thyristor-controlled for it. Incidentally. FETs aren't subject to second borne interference can usually be easily removed PSU which misbehaves for no good reason, try breakdown, which is a good reason for using them by fitting an RF mains filter of some kind. The some filtering and a VDR or two. as the pass elements in PSUs. increase in popularity of the home computer has Before you buy a particular mains filter, it's Quite why the notion of safe operating area is so led to the appearance of many types of filter built worth checking whether it incorporates some neglected in the literature is a bit of a mystery. It's into the enlarged body of a standard 13A plug. All form of transient suppression. Having said that, highly important to know about SOAR if you want you need to do is to replace the existing plug with it's easy enough to fit a VDR inside every one of to design reliable circuits with power bipolar one of these; the local computer shop will almost your mains-powered items and this has the transistors. certainly keep them. Alternatively, Electromail benefit of conferring protection on the equipment does a range of three which handle successively whatever it's plugged into. We've always used the Mains-borne Noise greater currents - the stock numbers are 238-902 GE-MOV II devices made by General Electric and 1 have terrible trouble with mains-borne noise for the 3A version. 238-918 for a 7A component available from the likes of Farnell. Maplin and coming into my HF receiver. The low-frequency and 238-924 for a 13A job. If you prefer. you can Jermyn - although VDRs are also made by several bands seem worst affected but even 28MHz buy a dual 13A mains socket which contains an other companies such as Harris Semiconductors suffers quite often, especially when my DIY-mad integral filter. These fit into the standard 35mm- and Philips Components (Mullard). For UK mains neighbour gets his electric drill out at the weekend! deep wall-box and in our experience do a very voltages, the GE device you want is the V250L4OB

56 RADIO COMMUNICATION October 1989 IN PRACTICE

- it's like a large red ceramic capacitor and you just surprising - how can a humble power diode or two wire it across the primary of the mains transformer produce copious amounts of RF? The reason is a or any other suitable point where you can get at little complicated to explain, but the diagrams phase and neutral. This will stop any surge main may help. In essence, the rectifier diodes begin to voltages dead, and 'crashes' become a thing of the conduct when their anodes are taken anything past; a secondary benefit is that the rectifier(s) more than about 0.6V more positive than their and other components are given protection from cathodes; in this condition we say that they are mains surges, which is especially important in the 'forward-biased'. Now the waveform at the secon- case of high-voltage supplies with several rectifiers dary of the transformer in Fig 3 is an alternating in series. In fact, it doesn't hurt to fit integral mains sine (ish) wave with a frequency of 50Hz. Let's filtering and VDR protection to the power supplies suppose that at one particular time which we'll of everything in the shack. You can get everything refer to as T. the voltage at point X on the you need at rallies for a few pounds, and the transformer secondary is at its maximum positive benefits are out of all proportion to the costs. If value with respect to the centre-tap. It follows that you really don't fancy connecting things to the at point Y it'll be at its most negative. Assume for mains circuitry inside your rig, you can buy 13A DC out the moment that Si is set so as to connect R1 DI between the output of the rectifier and the plugs which contain integral VDRs - again, the local computer shop is a good source, or Electromail negative (OV) rail. does them under the stock number 238-665. At time T. the anode of D1 is positive with However, you may as well pay a little extra and get respect to its cathode and it will conduct - Fig. 3(a) The hall-wave rectifier — seldom found in connecting point X directly to Si. So current from a plug which contains an RF filter as well as a VDR modem equipment. Ripple frequency is 50Hz, and the or two. DC flowing in the transformer core can cause problems the transformer is supplied to RI via 01. Conversely, Having done all this, of course, you will then at high current. the anode of D2 is negative with respect to its cathode so it is 'reverse-biased' and won't conduct discover that you have S5 power-line noise - Fig. 3(b) The full-wave (strictly '61-phase half-wave') which you couldn't hear previously because of all rectifier. Requires a centre-tapped transformer at all; at lime T, 02 might as well not be there. the din coming down the mains... secondary and was popular In the thermlonic era when However, when the secondary voltage reverses its two rectifier diodes were often placed In a common polarity (at T plus 10 milliseconds for a 50Hz envelope. Ripple frequency is 100Hz. supply), the situation is changed. Point Y is now RFI from the Hi-Fi Fig. 3(c) The full-wave or 'bridge' rectifier. Makes better positive with respect to OV and point Xis negative, 'Please can you help me with a very strange use of the transformer than the bi-phase and does not so current flows from point Y via D2 - which is now require a centre-lap; is easy to implement with forward-biased - to R1. It is D1 which is reverse- problem. I have a moderately expensive valve semiconductor rectifiers, especially since modules audio amplifier, which lives in the lounge along containing four rectifier diodes are cheap and common. biased now and plays no part in the circuit action. with the rest of the hi-fi system. My shack is in an So the essence of this form of rectifier is that the upstairs bedroom directly over the lounge and - two diodes conduct on alternate half-cycles of the for rectifiers, but for our purposes we can divide you won't believe this - the audio amplifier creates secondary voltage waveform and pass current to them into two families. These are known as 'half- a very high noise level on the LF bands when it's R 1 . Each one begins conducting as soon as its wave' and 'full-wave' respectively - see Fig 2. With switched on! There's about S6 noise on 3.5MHz. anode voltage is anything more than about 0.6V the advent of solid-state diodes the half-wave type although it's only just detectable on 7MHz: it higher than its cathode voltage. Remember that in has become almost extinct in amateur shacks for sounds like a 50 or 100Hz waveform which is rich this example the cathodes of both diodes are applications requiring much in the way of current, in harmonics. A medium-wave transistor radio in connected (albeit via a resistor) to 0V; if you think so we'll neglect it for now and concentrate on full- the kitchen is almost unusable. The amplifier about it, you'll see that 01 will start to conduct as wave rectifiers. sounds fine, but the noise is there even when soon as point X reaches about +0.6V with respect In 99% of domestic and amateur applications, a there's no signal. Could it be unstable?Neither the to the OV rail and it will keep conducting for the full-wave rectifier will use one of two configurations rest of the half-cycle until the point where the supplier nor the (American) manufacturer of the - the 'bi-phase half-wave' or the 'bridge' with the voltage waveform is again passing through about amplifier has been able to help - can you?' M McB. bi-phase needing a centre-tapped secondary on Edinburgh 0.6V on its way down to zero - after which 02 will the transformer. For reasons we won't go into If the amplifier sounds OK and isn't blowing up take over for the next half-cycle and so on. now, the bridge rectifier makes rather better use of In other words, you could say that the tweeters with monotonous regularity, the odds the transformer than the bi-phase and is much are that it isn't a stability problem. We suspect that 'conduction angle' of both 01 and D2 with a more common in modern equipment. You can the interference is almost certainly being generated resistive load is not far off 180° - and that will be also use a bridge to get double the voltage from a by the rectifier in the amplifier and either radiated true irrespective of the transformer's secondary transformer originally intended for use with a bi- by the associated wiring or coupled back into the voltage unless it's very low and 0.6V is an phase rectifier, which can be useful if you're mains in some way. appreciable fraction of it. Now let's consider what careful about the current you draw from it. This is probably the cue for an item about some happens when we switch Cl into circuit instead of RI. It will charge up very quickly to somewhere of the finer points of rectifiers. On the face of it you Rectifier Interference might think that there weren't many, but actually around \/.2 times the supply voltage and - since All rectifier circuits have great potential for there are quite a few factors to take into account there's nowhere for the charge to go apart from generating interference. You might find this when designing rectifier circuits, even if you any leakage current in Cl and perhaps a very merely want to know which component to use small amount of reverse current through 01 and with a particular transformer and reservoir capacitor. 02 - the DC voltage (which you could measure We'll confine ourselves to some basic points for with a meter) at the cathodes of D1 and 02 will be now and perhaps consider the subject in more very nearly the same as the peak voltage produced detail later on. by the transformer secondary. Put simply, the function of a rectifier is to This is going to make a drastic difference to the change AC to DC; we normally use the word in the working conditions of DI and 02. Instead of context of converting the AC voltage from the conducting for almost 180° of the half-cycle, each secondary of the mains transformer in a PSU to a one is going to conduct for almost none of it. As we've seen, the only time either diode can connect pulsating DC waveform, which is then smoothed Fig. 4 Circuit to illustrate the concept of 'conduction to something approaching true DC by the reservoir angle'. When S1 is seta to connect the rectified output the transformer to Cl is when one or other of them capacitor and any subsequent components such from the transformer to R1, the rectifiers conduct for is forward-biased. However, if their cathodes are as a smoothing choke or resistor and a smoothing almost all of each half-cycle from the secondary. kept at almost the full peak secondary voltage by However, when S1 connects Cl Instead, the rectifiers capacitor. A rectifier consists of one or more the voltage on Cl they can only become forward- conduct for only a very short lime on each half-cycle. biased at the absolute peak of the secondary diodes, which as we know have the ability to pass Consequently, the current into Cl flows in the form of current in one direction and block it in the other. short pulses with a repetition frequency of 100Hz. This is waveform - meaning that they conduct for a very There is a wide variety of possible configurations a possible source cl RF interference. short time indeed before becoming reverse-

RADIO COMMUNICATION October 1989 57 IN PRACTICE biased again. If you measured the conduction offending unit and another one on the affected rig angle with an oscilloscope, you'd probably find it - or. if you don't mind modifying the unit, see REAR UNDERSIDE was only a degree or two. It certainly wouldn't be whether you can screen the rectifier and its wiring Jorn thes W WV tag to aOrn lag al bottom ot anywhere near 180°. in some fashion. If you're home-brewing an RF water linear amplifier (or an audio power amp, come to J58C PA VALVES that) it's a good move to design such suppression The Bottom Line into the rectifier circuitry early on. Can you see where this is leading? Audio power Rectifier interference has been with us for many amplifiers (and of course RF linear amplifiers) years. and it's strange that almost none of the PA SCREEN tend to have beefy power supplies with high-value standard textbooks seem to mention it. Bear it in reservoir capacitors. In use, the amplifier is mind as a possible source of mysterious 100Hz- drawing current from the reservoir, which - to put based interference in your Rx. it colloquially - is 'topped up' 100 times every second by the rectifier. But as we've seen, the top- Get your FT1 01 on the up current will be in the form of a very narrow DRIVER SCREEN new bands pulse. It won't be quite as narrow as the pulse in Jo. One tag to Imply tag al our example above because there's now a load on Harry Leeming, G3LLL, of Holdings Amateur ballots wafer - IS Inh WWV and 20m lags. the supply. So the average voltage on the reservoir Electronics has been burning the midnight oil to capacitor won't be as high as the peak voltage work out how to get FT1Ols from the Mkl to the from the transformer secondary. Consequently. '101E on to the new bands (but not the '101ZD). the voltage on the rectifier diode cathodes will be We thought that with the release of 18 and 24MHz, 12) Mount the relay with suitable adhesive in an lower than the secondary voltage on the anodes it would be a good idea to describe how to do it. inverted position adjacent to the 'X' crystal socket. for a greater proportion of the half-cycle, so they'll Harry points out that the mods are simple but Solder a thick wire to one side of the relay coil and conduct for rather longer. But the important point some experience is necessary. Here's the info: connect this to chassis via one of the screws on to grasp is that the required current has to flow PARTS: 2 crystals, 1 SPST switch and 1 low- the crystal board. from the transformer into the reservoir capacitor capacity SPDT relay. 13) Wire the centre contact of the relay to the in an awful lot less than 50 milliseconds. And 1) Make sure that the rig is in good working wire which originally went to the 21MHz crystal instead of there being a smooth transition from order, then disconnect it from the mains. socket. reverse- to forward-biasing - as was the case when 2) Remove cabinet and base. 14) Wire the relay contact which is made when R1 was in circuit - the diode now switches abruptly 3) Identify the 21MHz and 27MHz crystals and energized to the hot end of the 'X' socket. from the reverse-biased 'off' state into heavy oscillator trimmers (touching the hot end with an 15) Wire the contact made when the relay is forward conduction. In mathematical language, insulated screwdriver will cause the note to NOT energized to the hot end of the 21MHz crystal dl/dT is very much higher when Cl is connected. change when the Rx is tuned to the calibrator on socket. The actual conduction angle depends on the the appropriate range). 16) Wire the free end of the relay coil to a length load current, the size of the reservoir capacitors 4) Fit a 24.02MHz crystal temporarily in place of of insulated wire and route this towards the rear of and a few other parameters, so it's not possible to the 21MHz one and fit a 30.52MHz crystal in place the rig. quote hard-and-fast figures. What you can say is of the 27MHz rock. 17) Fit the new switch (which is henceforth the that with a capacitor-input filter it's always going 5) Check the rig on receive. 18.1MHz should '18/21MHz' switch) by filing out the hole which to be very much shorter than 180°. come in at '100' on the black dial and peak at holds a cabinet screw above the IF and AF phono In other words, heavy current pulses with a very around 7 on the preselector. 24.9MHz comes in at sockets at the rear. short rise-time and a repetition frequency of '900' on the red dial and peaks similarly at about 8 18) Wire one side of the switch to the 13-5V rail 100Hz are flowing in the rectifier and associated on the preselector. The mod usually works and the other to the wire going off to the relay coil. wiring. Incidentally, this is why the data sheet for without any alignment being required; however, il You've now finished the hard bit. Next, check some rectifier diodes places an upper limit on the the Rx is dead on either band, tweak the 21 or the crystal oscillator trimming - see 5). size of the reservoir capacitors which may be used 27MHz trimmer by the minimum amount necessary You should now find that the '15m' position with them. This phenomenon also has an important for the rig to burst into life. See the section in the tunes 21-21.5 or 18-18.5MHz as selected by the bearing on the choice of rectifier for use in a manual entitled 'Heterodyne Crystal Oscillator' new switch and '11m* tunes 24.5-25MHz. particular application, which we'll consider on and align correctly after you've completely finished The 21 and 28MHz bands will operate as before another occasion. The fast rise-time means a high the mod - or just peak for maximum drive if you except that the loading will be about 2 points harmonic content, and the high current implies haven't got a VTVM or whatever. The setting of the clockwise of where it was. The PA will tune the high energy therein. Unless the equipment is very 21MHz trimmer will be a compromise between new bands around the 15-20m point. Holdings well screened, there will inevitably be lots of RF that band and 18MHz, but it isn't critical. advise keeping the power to a maximum of 50W radiation from the rectifier wiring. In some cases it 6) Remove the top of the PA cage and locate the and using an antenna tuner to ensure a clean can also couple quite nicely into the mains. As a loading capacitor. MAKE SURE you've discharged signal. 10W is equivalent to about 100mA anode digression, and just to show that even highly- the 600V rail before sticking your pinkies inside. respected professional designers can't think of 7) Strap the two sections of the loading capacitor everything, one of the finest audio power amplifiers in parallel by soldering a short lead between the in the world - the Krell KSA-80 - is also an two top live terminals - then refit the PA cage. NEW RELAY AND CRYSTAL BANK extremely good generator of RF hash from its 8) Remove the screening cover over the driver/ rectifiers! range switch and strap the switch as shown in Happily, it's usually easy to cure the problem of Fig.l. You'll need a long and thin bit on the rectifier interference. First, check the screening of soldering iron. Refit the screening.

the offending amplifier. Then do what most 9) Ensure that the 30.52MHz crystal is in the ISIAH. 211.411r manufacturers of HF linear amplifiers do and 27MHz position. Then fit the 24.02MHz rock in the Swath connect a 100nF capacitor (with a suitable working spare ('X') position and the 21MHz one back in its To 13.5v voltage) across the secondary of the mains original place. Red transformer and another one across the rectifier 10) Remove the two screws from the crystal output. For split-rail supplies, use a capacitor panel and withdraw it slightly. Place the rig on its FRONT TOP across each rectifier output to earth. If that doesn't side (mind you don't lose the spacers) and stop the hash, try small chokes in series with each unsolder the lead from the 'hot' end of the 21MHz 'leg' of the rectifier output; about 1mH should do. crystal socket - that's the end which is NOT Virre'D to wrre aliachecl to lans CHASSIS Wrre 'A' lo Rot End "X • Capacitors connected directly in parallel with commoned with the other rocks. Wrre C'Io Hot End 05m sock•I Ys C13/1trn FTIOINkin each diode in the rectifier can also have an effect; 11) Wire two short insulated leads to the hot 2s GS M.n moat early FT 101s experiment with anything between 1 and 100nF. If ends of the 'X' and 21MHz crystal sockets - then On Spare Socket all else fails, try a mains filter on the input of the refit the crystal panel.

58 RADIO COMMUNICATION October 1989 IN PRACTICE current and 200mA gives about 50W CW: 130mA have to sweat it out and hope for a fresh breeze. clean SSB - which is typically going to be peak is about 50W PEP. How big should a heatsink be? It all depends on dissipating a good 100W as heat. What's the Finally, you might like to note that the '11m' the heat load. At one extreme, a tiny clip-on junction temperature under these conditions? crystal is marked 33.02 and the '15m' crystal 27.02. heatsink may be enough for a small transistor If you're using the 'X' socket, you'll need to wire in dissipating only a few hundred milliwatts. But a A Bit of Maths a crystal holder and run one end to the relay and solid-state PA rated for 100W RF output is likely to We've already thought about the idea of thermal t'other to the cold end of the 'X' crystal. NB late have to dissipate an additional 100W of heat, and resistance and mentioned an 'Ohm's Law' of heat production FT101Es label the CB band 'AUX'; that calls for something much larger. A typical RF flow, so here it is in full. earlier ones call it '11m'. PA will contain one or more flange- or stud- Junction temperature (°C) = Thanks to Harry for these mods — great stuff. mounted RF power transistors which are bolted to thermal power (W) x (Ojc ± Och ± Oh (°C/W)) t a large finned heatsink of extruded aluminium. ambient temperature (°C) All the heat flowing from the semiconductor It's just like the electrical Ohm's Law (think of it Heatsinks and Hi-Fi? chip must eventually be given up to the surrounding as 'Ot's Law), with temperature taking the place of Last month I had a wee dig at the wacky world of air. The first stage in the heat transfer path is voltage and heat flowing like current - and the hi-fi. There must be some very creative PR men inside the transistor itself - from the semiconductor higher the thermal resistance, the higher the working for audio amplifier manufacturers; il you junction to the mounting flange or stud. Then the temperature drop. As we've seen. Ojc is the remember I quoted part of a press release which heat has to flow across the barrier between the thermal resistance between the transistor junction claimed that the sound quality of the Mk II version flange and the heatsink, and finally it has to spread and the case, and is about 0.7°C/W for a flange- of a certain British hi-fi amplifier was greatly out through the heatsink and cross over into the mounting RF power transistor. Och is the thermal improved by the different heatsinks with which its outside air. The better the heat transfer path, the resistance of about 0.5° C/W between the flange output transistors were fitted. No doubt the Mk Ill cooler the semiconductor junction will be and the and the heatsink, and Oh is the thermal resistance will sound even better because the colour of the longer the transistor will last. Since heat flow is on the heatsink itself. Strictly speaking, Oh is the power-on LED will be changed from red to yellow. very much like electrical current, the same principles thermal resistance between the heatsink mounting Anyway - we took that as our cue to consider apply. Use highly conductive materials with large surface and the surrounding air, and power heatsinks from a slightly more useful point of cross-sections, and make good connections which transistor heatsinks have values typically in the view. have a low resistance to heat transfer. As we'll see range 0.2 to 1° CM. In case you hadn't noticed, we've had a most shortly. a kind of 'Ohm's Law' of heat can be used To calculate the junction temperature Tj of a un-traditional English summer. As usual in such to work out how well the transistor is being transistor dissipating 100W on a 0-5°/W heatsink circumstances, there's been a surge in the sales of cooled. at an air temperature of 25°C, we simply apply beer, soft drinks. ice-cream - and RF power 'Ot's Law' - transistors. It's an unfortunate fact that when the Heat Flow Tj = 100 (0.7 0.5 t 0.5) t 25 = 195°C hot sun shines on your equipment sitting by the Looking at each of the heat transfer steps in turn. That looks uncomfortably hot, given that most shack window (or on the boot of your car with the efficient heat flow within the transistor is obviously power transistors have an absolute maximum Tj of mobile PA inside) you may be about to come face- the responsibility of the semiconductor manufac- 250°C and some have a lower one than that, but to-chequebook with the problems associated with turer - there's nothing you can do to change it. The there's worse to come. Although the power heat dissipation. datasheet for that transistor will tell you the transistor may have a rated thermal dissipation as Electronic components hate high temperatures 'thermal resistance' between the junction and the high as 250W when its case is held at 25°C, the - and transistors in power amplifiers dread them case; it's usually referred to as 'Ojc' (pronounced datasheet will invariably show that the device most of all. The tiny semiconductor chip can be "theta-j-c") and measured in °C per watt. For must be derated at higher temperatures — typically dissipating a good 100W of heat, and the problem example, if Ojc is 1.0°C/W, every watt of heat by about 1-4W for every degree above 25°C. is to get that heat away before the temperature flowing out through the flange causes a 1°C rise in Applying 'Ots Law to find the temperature of the rises too far and the device fails. The usual failure junction temperature. transistor flange, this works out to be 125°C. This mechanisms are bound up with an increased The next thermal barrier lies between the implies that the transistor must be de-rated by 1-4 susceptibility at elevated temperatures to excessive transistor flange and the heat sink, and this is x (125-25) watts from the original 250W. So the drive power, high voltages or high VSWR. There's where home-brewers sometimes come unstuck. available dissipation at a case temperature of also the phenomenon known as 'thermal runaway. You can't simply bolt them together and hope for 125°C is thus only 110W — which leaves almost The only thing to be said in favour of thermal the best! In modern RF power devices, flat flanges nothing to spare above the 100W we need. runaway is that it is a problem confined to bipolar are superseding the older single-stud mounting In particular, this leaves no allowance for transistors; FETs aren't susceptible to it. On that because they offer a larger area for heat transfer. additional dissipation in poor VSWR conditions, basis, you won't be surprised to hear that it's Ideally, both the heatsink and the transistor flange or for the fact that the temperature inside your car related to the second breakdown phenomenon we should be rubbed smooth and flat with very fine boot may not be 25°C. If it's 60°C. for example, all discussed above. Under constant bias conditions. emery or grinding paste, with a thin smear of the temperatures along the heat transfer path collector current increases with temperature. This thermal conducting paste on both surfaces to fill increase accordingly. pushing the junction temper- causes more dissipation in the transistor, a rise in any remaining irregularities. One warning, though. ature up to 230°C and the transistor closer to the temperature, even more collector current... and Although heatsink paste is a better conductor of edge of breakdown. Exactly the same applies, of ultimately the transistor junction melts into a heal than ordinary grease (although just as course, if the sun is shining directly on the useless lump of slightly impure silicon. Solid-state messy), it still isn't particularly good, so never use heatsink and pumping in additional heat. power amplifiers are particularly prone to thermal more than necessary. If the transistor and heatsink The regrettable conclusion is that a 0.5°C/W runaway, for two reasons; a) they generate mate together properly, there should be no need heatsink is barely big enough to handle 100W of considerable heat and b) they need to operate for excessive tension on the mounting screws, heat continuously with any margin of safety for with a small amount of permanent forward bias. which risks breaking the transistor. For some the transistor. And how big might such a heatsink As well as subjecting the device to additional stud-mounting devices the data sheet will quote a be, physically? Well - just about the size of the electrical stress, excessive drive and/or high torque figure to which the screws should be heatsink on the average 100W 'black brick' alas. output VSWR will also increase the power dissipa- tightened - it's important to stick to it. Having done It's big enough for normal use, especially on SSB tion - and with it the risk of thermal runaway. all that, you might be surprised to learn that or CW where the low duty-cycle acts in your In essence, power transistors opt out when the thermal resistance of the joint is still about 0.5°C/ favour, but there's very little in reserve. If all the sun shines if their heatsinks aren't big enough W. This means that the flange of a transistor factors conspire against you - prolonged use at to keep them cool. Largely as a result of the trend dissipating 100W will be about 50°C hotter than full power, in full sunlight or in a confined space towards physically smaller equipment. the manu- the heatsink it's mounted on. such as a car boot, and maybe with a poor VSWR facturers of transceivers commonly include Let's now consider the heatsink itself. Most as well - don't be surprised if you find yourself thermostatically-controlled fans nowadays; equally, heatsinks are barely big enough, as the following facing a bill for a new power transistor. many rigs have temperature sensors which reduce example will show. We'll think about one of those That's all we have space for this month. If fitting the RF drive if you attempt to run full power for too so-called 100W power amplifiers - remember, by a different heatsink to your transmitter PA makes long. But the RF power transistors in older rigs the way, that a '100W' solid-state amplifier is your audio sound better, hire a PR man and send (and in almost every add-on '100W brick') just highly unlikely to deliver more than 50W PEP of us a copy of the press release...

59 RADIO COMMUNICATION October 1989 DATACOMMS

This is your chance to make a real time conversations at once. other parameters as their defaults NEIL LASHER, G6HIU 40 Farm Road, Edgware, Middx suggestion lodoso drop Phill Some offer the facility of a personal unless you have a transceiver with [HA8 9LT Bridges a line at Siskin Electronics. mailbox which enables the user to relay switching. With slow 2 South Street, Hythe, have other amateurs leave personal switching of this type you should RTTY News Southampton SO4 6E8. messages for them when they are after the parameter called The RTTY repeater GB3PT has not available. The problem with this TXDELAY. The default for changed its speed from 45.45 baud system is that the messages are Licences TXDELAY varies from TNC to TNC to 50 baud in accordance with stored in RAM, which is volatile but should not be left too low It's a very quiet month for GB7 RSGB recommendations. The when power is removed. For this especially when using HF as older licences, with none being issued by repeater is located at Barkway. near reason it is safer to use the mailbox valve equipment takes a few the DTI. (This must have something Royston, and operates on input network provided. The best advice I milliseconds to get to full output to do with holidays.) I'm pleased to 433.900MHz to output 433.300MHz. can offer is to keep it simple. Nearly power. see all of the GB7 calls in use on In addition to RTTY it supports 300 all TNCs have the same command The time has at last come to 70cm. as reported last month, and baud V21 data. set and if I were to be starting make your first connection. If you especially the increase in speed of Details were provided by Phillip today, my choice of TNC would be are not sure of your local mailbox Mellor, G4BIK. messages from north to south. With made by how clear the manual was. leave your system receiving for so many more mailboxes now (3). Software. A large amount of about 15 minutes and then with the running 24 hours on UHF could this people I meet are under the command prompt on the screen Dataspace '89. be the start of the system we have impression you need an expensive (usually cmd:) type MH. A list will all been waiting for? Connected with this event are two software package, this is not the amear of all stations that have been new publications. First, although case. Many stations are using heard. At least one of these should Next month I hope to be able to very late in being published, are the simple terminal emulation software, have a GB7 + 3 letter callsign. To report first hand on the latest proceedings of last year's mostly available as Public Domain connect to this mailbox type C developments in the packet scene symposium. Published by the software. There are custom GB7xxx (C is the command to in America. While I am in the USA I RSGB it is very informative and well designed packages available for connect and xxx are the letters you have been invited to PacComm to worth reading. setting out all of the certain computers, but although have seen in you MH list). see items for future release, papers submitted. Second are the they do make life easy with split Once you have connected you including a working version of the proceedings of Dataspace '89 screens. storage facilities and screen will have a message similar 9600 baud system and the new Published by AMSAT-UK. The copy methods for changing TNC to: ultra-miniature TNC that fits inside I received was the Australian parameters, they are not a Connected to GB7 xxx a laptop. version (bound upside down and necessity. followed by the message of the day back to front) but nevertheless a (4). Transceiver. from the mailbox. must for all Data and Space Beginners - Getting From there, experiment. Typing H enthusiasts. Started Getting Started. will give you a help screen. This month I hope to provide you Now that you have all the Your Chance to all with the information you need to equipment it's time to get on the air. SysOp 7 Shrewsbury Influence the Future get on the air and sel up a packet The first few chapters of the manual 23 July 1989 I have been asked by Siskin station. for the TNC are the most important The SysOp meeting took place as Electronics to canvass all packet If you are new to the mode, don't and should be read very carefully. planned in Shrewsbury, with a good users for their suggestions on the be put off by some of the technical They set out the various diagrams turn-out even though the weather next series of INC firmware jargon - it really is quite simple. for wiring the INC to computer and was glorious. It was very (software on the chip inside the transceiver. The RS232 connections productive; with varied subjects TNC). What you will need. are normally pins 1 thru 8 and no 20 including: After the recent proposals from (1). Any computer with an RS232 of the RS232 interface plugs. As for Confirmation of @ fields and the Martin Stubbs, G8IMB, in Connect interface or a simple terminal the transceiver you will need to election of a co-ordinator for them International they are looking at a emulator will do. There are many connect PTT, TX audio, RX audio namely Doug Shore GOEOJ @ simpler system for new users of stations using Spectrums and and ground. Some transceivers GB7YAX. TNCs. For example on power up Ataris, and even some using today also are designed with the The formation of a co-ordinating the user could be faced with a sophisticated equipment such as facility for squelch monitor committee, to provide co-ordination menu offering a list of options like: IBM 386 technology. This is one of specially for packet radio, in which between all of the various working MENU (choose number then hit the few cases where, unless you case you must follow the groups with the aim of solving any Return) intend to run a mailbox, you will not manufacturer's instructions. of the network problems. This 1)Customise personal details. see any difference between the type Once you have connected committee will be co-chaired by 2)Set up a connection of computer in use. everything together and followed Paul Guilbert, GODXX, and myself, 3)Toggle Personal Mail System (2). Terminal Node Controller any instructions supplied with the Neil Lasher, G6HIU. On/Off (TNC). This is an interface that TNC for calibration, it is time to talk Varied discussions about NET/ 4,) Check for new mail plugs directly into the RS232 to the TNC before you talk to the ROM nodes, locking of routes, 5)Enter mail to message system interface and then into any world. The INC on startup will have parameter changes and a submitted 6)Alter system configuration transceiver. It is the encoder/ a set of defaults most of which will paper on standardising level 4 If a user typed number 2 they decoder and main controller for the be alright to start with. You must Destination addresses and aliases. would be prompted with: packet system, so choose the type tell the TNC your callsign using the Removal of SSID from GB7 you wish to purchase carefully. command MYCALL or MY; ie MY mailboxes. ENTER CALLSIGN YOU WISH TO With many products on the market G6XXX. The INC will respond with The next meeting was planned for CONNECT TO AND HIT RETURN offering different facilities you will a message similar to: the end of October/ beginning of have to make your own decision November in York, north of the MYCALL was NOCALL ENTER CALLSIGN(S) OR NODES here; don't get carried away with M62, so there will be no excuse for now G6XXX FOR PACKETS TO BE ROUTED flashing lights and multiple ports SysOps in GM not to attend... VIA because it's very hard to hold two AND HIT RETURN, etc. Set the INC to monitor the Finally frequency by typing MON ON. The That's all for this month apart from Dataspace '89 papers are TNC will respond with a message This is just an idea but cast your a small message to all Clubs and available from RSGB similar to: mind back to your first INC with packet groups. Do let rue have Headquarters, or from AMSAT- MON was OFF almost 100 commands available, details of your future events for UK. The price is £11.00 plus now ON and only about six you ré'ally publication at the above address. postage at the 900 gramme rate. needed to get started. For the time being leave all the Copy dates are 20th of each month

60 RADIO COMMUNICATION October 1989 MICROWAVES QRP

MIKE DIXON G3PFR varactor gear over to GI for VHF FM circuit given in the original GEORGE DOBBS G3RJV 'Woodstock', Grazebank, Norley, NFD in 1976 or 1977 - 'certainly all article produced significant amount Si Airlen's Vicarage. 496 Manchester Hood. Rochdale °Lit 3HE Warrington. Cheshire WA6 8LL the inter-G firsts would have been of phase modulation, in addition to done then, also GI-El to El6AS. The FM. above about 1kHz; this is early OSO's were FM but by 1978. correct and the circuit was Recent Microwave SSB was in use'. Thanks, Ian. for originally intended for either QRP in Texas Operating Awards some interesting bits of history. speech frequencies or simple FSK The friendly Texas alternative to Of a 'collection' of nine operating use. 'Have a nice day', 'Y'all come back' awards or award stickers notified by is an instant indication of the the Awards Manager, G4OUT. this Eastnet's Experiences 10W PA Block gregarious nature of the Texan. The month, six of them were for the James, G3RUH, (of 9600Bd modem For PA use, the group has adopted friendliness is endemic and the 1.3GHz band, and one for each of fame), put in some feedback on a board layout by Mark. G6TIU. English are singled out for special the 2.3, 3.4 and 24GHz bands, thus Eastnet's experiences with 1.3GHz which uses the 10W Mitsubishi attention. In 1983 I enjoyed a month proving that there is still some gear for packet links. Not all their hybrid power block (as used in in Texas, centred around the ARRL activity after all! experiences have been good, lcom rigs) and has inbuilt PIN National Convention and when the On the 1.3GHz band Dave, underlining again. I believe, the switching, power output chance came to return for the ARRL G6UWO, claimed the Standard distinct differences between VHF/ stabilisation. SWR protection using 60th Anniversary Convention. I was award (No80); John. G4BYV. the UHF equipment and microwave directional couplers and a 10-pole pleased to accept. Senior award (21): John, G4ZTR, equipment. The group has had Chebyshev microstrip filter, the The ORP ARCI (the American the Distance award (127); Ela. experience with a dozen or so of whole thing being throttled back to QRP Club) invited the G QRP Club G6HKM, the 20 (31) then the 25 the Cirkit 23cm receiver kits. 4W for comfortable running. No to send speakers to a national ORP Squares (27) award and Keith. Nearly all have suffered a variety doubt interested parties could Forum organised as part of the G6DER (mentioned in the last of problems, the commonest of contact Eastnet to get details and convention. It is surprising that awards news) 70 Squares (4). which seems to have been too low a their experiences and suggestions Texas, the land of the large, has Keith, G6DER, also gained the 35 level of drive to the first mixer. first hand, although I still find it very always provided the strongest Squares award (No.2) on 2.3GHz Various 'fixes' were described: surprising that they have needed to support for organised GAP interest and the 10 Squares (No2) on increasing the value of a damping go to such lengths to modify such a in the United States. So in June of 3.4GHz. The final award was to resistor (R18) in the first multiplier sure-lire design. this year, Ian Keyser, G3R00, and I Dave. GM3WIL, for his portable of the oscillator chain, adding extra travelled to Dallas for the ARRL operation on 24GHz where he has decoupling to one of the transistors From Here and There National Convention to provide won an Intermediate certificate (05) and changing a choke from a Most of the rest of the news this their requirement of lectures on (No7). Well done all stations and moulded type (L5) to a 4-turn air- month is made up from snippets home constructed GAP equipment. thanks to Ian, G4OUT, for the spaced coil. 4mm dia. These (notes from and conversation with I lectured on a range of simple and ledger abstract. changes have increased LO drive various operators) which have been inexpensive equipment and Ian by as much as 10dB and they are accumulated over the past few described buildable superhet and passed on as possible solutions for months, most of which have been single sideband equipment. Some history from GI anyone having problems with the too small to present a coherent Like most American amateur Ian. GIBAYZ. sent an abstract of an design. story in their own right but put radio conventions, the event was old log some time ago which The group also appear to have together may present something of more alive than our equivalent detailed some interesting firsts from had problems with low output from a cross-section of what has so-far events, with a full programme of Gl. He had a one-way OSO from the G4DDK oscillator source - all been a quiet year. lectures and forums, a flea market Torr Head, Co. Antrim to Chris. so far built suffered from low Russ, GW3CCF (near Mold), was larger than the considerable GM8BKE, near Ayr on 11 May 1975, output. I personally find this the most recent of a number of commercial exhibition area and one way because of a receiver fault surprising having built a couple of people who, in the past few months. many of the visitors staying for two at Ian's end. The same problem the boards (home produced, have wondered whether there or three days at hotels on the site. reared its head on 31 May, 1975 in incidentally, despite my recent would be support for an 'activity For a part of the world which, in attempts with GM8BKE/P and recommendations in RadCom!) and night' on the 1.3GHz band. He and theory, should be the centre of the George, GD30XX/P (alias both have produced close to design others have suggested late in the amateur radio commercialism, the GM30XX). output - one slightly above and one week (early week evenings often interest in our home constructed Success at last on 1 June, 1975 slightly below, but both within a dB being Club nights) and one fairly equipment and the lectures was after working on the reciever as far as I can measure with simple common suggestion is 2100 or 2130 very high and the flea market overnight; Ian was rewarded with a equipment; one is on 1152 and the (local) on Friday evenings. Why not contained a range of items which contact between Torr Head and other on 1297MHz. give it a try? would delight any builder of Snaefell (GD30XX/P) for what was However. I can only repeat In the same letter. Russ equipment. The G QRP Club sent a believed to be a 'first out of GI' James' remarks: his group appear mentioned that he has had a fairly range of kits, circuit data and the CISO. Jack, GI8DMX, and Sam, to have thought il necessary to regular sked with G3BPJ (Leyland) ORP Circuit Handbook for sale on a GI8GJX. were both, at that time, increase decoupling around TR4 at 1315 hrs, over the last three ORP Booth. and the interest was 'mucking around with klystrons'. and TR3, as well as adjusting some years. Dennis. G3FNO (near such that sales of these covered the Ian reported that the following of the capacitor values. Some Southport), also calls in when cost of the trip. year (1976) GM3YOR and another redesign of the oscillator stage was available and all are equipped for The visit was a resounding station, whose callsign and name undertaken 'to improve temperature 13cm as well. success. We returned convinced weren't remembered or recorded in stability'. that home construction is far from the log, went to GI and did some In the original design, provided COMING LATER THIS dead in the United States and not 10GHz operating. Ian was still that reasonable care was taken in everyone wants to run a 'Californian active until the end of June 1980 construction and in selecting the YEAR... Kilowatt'. when he had a OSO from Black quality of the crystal and the Head (Belfast Lough) to Paul, hibusing of the board - possibly MICROWAVE GM8AFC/P, near Portpatrick. 'neutralising' the crystal by means Coherent CW Thereafter, 10GHz activity in GI of a series capacitor or parallel HANDBOOK It is some years now since Ray seemed to die out completely, with inductor (this can have an effect on Edited by Petit, W7GHM, published almost nothing reported in the past the level of output, using amateur M.W. Dixon, G3PFR information on an experimental few years. standard crystals) - the stability Watch out for the loose-leaf method of sending Coherent CW Ian felt that most of the GI firsts was good enough for narrowband advertisement and order form in signals (c.c.w.). It was claimed, and on 1.3GHz must have gone to (FM or SSB) applications. an imminent issue of RadCorn. largely varified by experiment, that AN RSOB PUBLICATION Willie. G(I)3VPK, when he took It was also found that the simple c.c.w. enables operators to increase

RADIO COMMUNICATION October 1989 61 BOB TREACHER BRS 32525 checklist showing the countries 93 Elibank Road, Eitham, London heard in alphabetical order MUST SE9 10J accompany the log. 5. Entries showing the full callsigns As October comes round again, of stations heard, the station being time to look forward to an worked, the time and signal gt improvement in radio conditions. strength of the stations heard As we head towards the peak in the (minimum acceptable reports being Sunspot Cycle, the hope is that the 4x4 on SSB or 449 on CW — note HF bands will once again provide a the change from last year). Logs good deal in the way of DX. 50MHz should be sent to me at the address enthusiasts are hopeful that DX shown at the front of the magazine, conditions on that band will be the to be postmarked no later than 21 best ever since the band was November for the SSB leg, or 19 ' • • released to British amateurs. There December for the CW leg. (Lett to righi) G3RJV and G3R00 with G3RJV and WORSP, already given that should be some fine F2 propagation Although there seems to be a Ade Weiss, WORSP, accept certificates honour In 1983, were made Honorary to look forward to. Hopefully, our current trend against contest from Fred Bonarita, W50.11A. 031100 was Admirals in the Texan Navy! listeners will be on hand to report participation by SWL's, I hope that made an Honorary Citizen ol Texas. the very best in these pages in due the Challenges will, as usual, be course. well supported. signal readability by a factor of 10 equipment. They have copies of and simultaneously reduce much of the relevant information on Sixth HF Challenge More on Taking Radio transmitter output power by a like the system and certainly enough As we are in to October, it is time Equipment Abroad amount. I outlined the system on data to enable anyone interested to once again to plug my annual HF After the piece in my August page 63 of the Amateur Radio build c.c.w. equipment. Peter would Challenge, which is designed in the column about taking radio Operating Manual (RSGB). like to hear from anyone who is hope that listeners will take a look equipment abroad, G3URE wrote Very briefly, c.c.w. uses the interested in joining them in the at the bands during the up-and- with some further helpful concept of signals transmitted and project. There is a smal section on coming CQWW Contests, log some information which is well worth received in carefully defined time c.c.w. in all issues of the ARRL good DX, and put in a entry for the repeating here. windows. All c.c.w. dots, dashes Handbook and it may be useful to Challenge. Every year, even in Having travelled for many years and spaces are exact multiples of a read this before going further. years of low sunspot activity, it is into highly sensitive areas carrying basic time unit and occur within Interested amateurs should contact: amazing how active the bands are radios, recording equipment and predictable time frames. Received Peter Lumb, G3IRM, 2 Briarwood during these two weekends. As this computers, he is reasonably well c.c.w. signals sound like Avenue, Bury St. Edmunds, Suffolk year should see the peak of the versed with the problems to be conventional cw signals except they LP33 3QE. Cycle, conditions could be encountered at airports. He felt it are sent very precisely. As a result exceptional. worth clarifying the difference very narrow filters may be used. 12 Looking Back The SSB challenge will be held between 'customs' and 'security'. w.p.m. is usual for c.c.w. and filter Many OAR operators are builders on 28/29 October, with the CW leg Generally. Customs only become bandwidths in the order of 10Hz. A and modifiers of equipment, so taking place over the weekend of involved after landing, and do not 1 watt signal copied through a 10Hz amongst them are a fair number of 25/26 November. Once again, the care too much about whether your filter is equivalent to a 50 watts those radio amateurs who derive idea will be to log as many box of shiny knobs will go off bang signal heard through a 500Hz filter pleasure from restoring and using countries as possible during the (as long as it happens outside the or a 230 watts signal copied old and classic items of radio two periods. So that 200 Ws do not Customs Hall!) — they are only through a 2300Hz filter. communication. The German DL appear in logs, only one station interested in whether you bought The advantages are obvious but AGCW Group have introduced a from each DXCC country can be the box of tricks on your holiday/ the system does require all new contest which should appeal to logged on each of the six bands. business trip, or in the UK and have frequency determining oscillators, such amateurs, for equipment The full rules are as follows: (1) paid VAT and duty. In this case it is including the clock for the keyer, to which is either homebrew or over Entries may be single band or always advisable to either obtain a be accurate within 1 or 2Hz. The 25 years old. multi-band, but not both. (2) Each carnet before leaving, or at least transmitter must also be stable, different country heard on each carry the UK receipt with you. under keying conditions, to within 1 AGCW DL HOT (Homebrew and band will count for points. Computers pose a different or 2Hz. Crystal controlled ORP Old Time) PARTY 1989 (a) Countries in the SWL's own problem and it is suggested that transmitters were successfully used DATE: November 19th, 1989. continent count 1 point on 28. 21 professional advice is sought before in the early experiments. Direct TIMES: 1300-1500 UTC on 7010- and 14MHz, 2 points on 7 and taking your expensive lap-top out of conversion receivers seem ideal for 7040kHz. 3.5MHz, and 3 on 1.8MHz. the country. the reception of c.c.w. signals, 1500-1700 UTC on 3510-3560kHz (b) Countries outside the SWL's Security is a different matter avoiding the use of another very Class A: TX and AX homemade or own continent count 3 points on 28, entirely. They will be very interested stable oscillator for the bfo. The older than 25 years 21 and 14MHz, 5 on 7 and 3.5MHz, in finding out whether your black filters are capable of being built by Class B: TX only or AX only and 10 points on 1.8MHz. box will play a tune or smoke, anyone who has a little experience homemade or older than 25 years 3. The final score should be before allowing you onto a plane, of building simple digital Class C: TX less than 10w input (5w calculated as follows: so it is suggested that removing any equipment. It may sound daunting, output) as above. (a) Single band entries — the batteries is not such a good idea. but I recall seeing a photograph of Call: 'CO HOT' and exchange RST total points should be added Experience suggests that Security an original experimental station serial number, beginning 001 on together and multiplied by the will be keen to see that you black which used a Ten Tec PM2 each band + class. e.g. 579001/A number of DXCC countries heard. box does what you say it will. My transceiver which is far from the Scoring: by class working: A-A, A- (b) Multi-band entries — the total earlier comments about presenting most sophisticated rig ever built. C. C-C = 3 points. B-A, B-C = 2 points from each band should be an open and helpful attitude, Coherent CW remains one of the points, B-B = 1 point. added together and multiplied by whether to Customs or Security. areas of the hobby open to the Log: UTC. Call. Check Numbers, the total number of DXCC countries were fully endorsed. genuine experimenter. The Scoring and total with a brief heard on each band. I hope that these helpful equipment must be home made but description of the station 4. Entries must either be on comments will straighten the record is of modest proportions and cost. equipment. To be submitted by standard sized logsheets and and will be heeded by listeners and Peter Lumb, G3IRM, together with December 15th to Dr Hartmut written legibly in ink, or on amateurs alike when travelling by Bert Arnold. G3RHI, are trying to Weber, DJ7ST, Schlesierweg 13, D- computer generated log sheets with plane either for business or revive the idea and are building 3320, Salzgitter 1. West Germany. 40 entries to the page. A multiplier pleasure.

62 RADIO COMMUNICATION October 1989 EMC MATTERS

Heard All Britain News so far received is little down on last HILARY CLAYTONSMITH, G4JKS HAB AWARDS ISSUED AS Dennis, GW6JNE, provided his now year. Logs from Japan, Australia, 115 Marshalswick Lane, St Albans. OF 12 JULY 1989 Herls ALI 41..IU regular update or SWL activity in Belgium and East Germany have HAB Silver been received, as well as a number HAB. A new Awards Manager has 36 G Ridgeway HF SSB been appointed. He is Dave, G4VID. 37 C Gibbs 40m SSB from these shores. Some quite He lives at 5 Braemar Close, good scores have been claimed, but Protecting products from EMI/RFI HAB Bronze we will have to wait for news of the requires effective screening, Kettering NN15 5DD. Quite a lot of 47 C Gibbs 40m SSB Listener Awards have been issued winners until I have been at the logs although many firms producing since the last update. A general 3500 Honour Roll with my red pen. I hope to have the electronic equipment which is 29 F Parkhurst 40m SSB overview of listener activity sees results into print soon. housed in shielded cabinets tend to One detailed view of the contest be more concerned with the SWL Wainwright mentioned 26 Districts Class III times in the listings. He has Class 313 E Brown 40m SSB has been received from Joan Slater, electronics than with the cabinets One awards in the Districts, 316 J Wainwright HF SSB BRS90400. She had not intended themselves. In some cases, the taking a serious part in this year's cabinets may be bought in, having Counties and Large Squares Districts Class II categories. 205 E Brown 40m SSB event, but after she had calculated a been tested in isolation from the Chris Gibbs has heard 2600 WAB 206 C Gibbs 40m SSB provisional score she found she had product. But for effective screening HF SSB Bookholders. He also has 150 207 J Wainwright a better one than in previous years. the case and 'innards' should be She therefore took the log on thouught of as one system, with Islands heard on 3.5MHz. Other Districts Class I listeners who are doing well in 138 G Ridgeway HF SSB holiday with her and wrote it out. testing for shielding effectiveness collecting islands are SWLs Brown 139 C Gibbs 40m SSB duped and scored it finally either on being carried out accordingly. 140 J Wainwright HF SSB and Sheppard. The 'daddy' of them the beach or at the holiday hotel! all, however, is Frank Parkhurst Large Square Class I She just about had enough Screened Enclosures who has achieved 3500 WAB areas 172 G Ridgeway HF SSB logsheets with her to finish the job As many people are only too aware. 174 J Wainwright HF SSB while away. manufacturers have tended towards on 7MHz and 260 islands on 177 C Gibbs 40m SSB 3.5MHz. More listener achievements Initially, she had decided that plastic packaging for their are shown in th attached table. Counties Class I there would be no more contests products. As plastic does not A 50MHz WAB/HAB contest is 213 J Wainwright HF SSB until a decent antenna had been restrict the path of EMI, and as a 216 C Gibbs 40m SSB arranged for 0900-1200 on Sunday erected, but somehow the 'old' remedial method, manufacturers antennas did their stuff. It will 8 October. Listener entries are Books Mixed Sedes have sought to provide a plastic encouraged and should be sent to 100 Books probably be her last SWL contest as with the conductive properties of 314 S Rogers SSS Ian Webb at Cornerways, Orchard she passed the last RAE after many metal, either by using nickel based Road, St Neots. Cambs PE19 3AN. 900 Books hours of studying (Class B paints or zinc arc sprays. These two 64 G Ridgeway HF SSB It is always interesting to hear licencess can still enter SWL methods have proved partially 2800 Books Contests). She had been successful, although Copper/nickel from Dennis, but I wonder if any of 1 C Gibbs 80m SSB the listeners mentioned here — or encouraged by a plaque in the plating is probably the only method any others involved in HAB — Islands Award shack which said 'There is no which can approach the desired would like to write and give me their 24 VHF 40 HF failure except by no longer trying'. standards at present. The bonding 113 G Ridgeway impressions of the HAB movement. She came away with two produced by this method is more I could then include this news in a 70 VHF 80 HF distinctions. Living 'in a bit of a permanent than the paints and 49 J Wainwright later issue along with all the latest hole' Joan hopes to catch some sprays and, because copper is an 80 VHF 90 HF good autumnal tropo on 144MHz to excellent conductor, the shielding HAB news received from Dennis. 39 D Davidson prove that the new rig will reach a effectiveness against high intensity 140 VHF 150 HF little further than 'the repeater down fields is very good. The emission 8 C Gibbs HF SSB New HF Contest the road'! aspects of EMC are also very Malcolm Harrington. BRS20249, 260 Islands 1 F Parkhurst 80m SSB important to consider. Any noise reports that the Society are to Finale which may be emitted from the promote a new LF SSB Contest Bookholders That's all for this part of the product through the case may next year which will be open to 20 Bookholders column. No doubt you have already effect nearby equipment. 10 E Brown SWLs to replace the 7MHz SSS read my 'Spectrum Analysis' bit. If There is also one other aspect contest which died earlier in the 40 Bookholders not, you know what to read next. which should be borne in mind - year. 5 F Parkhurst SSB I'm still on the look-out for that of security. Electronic It appears that the contest will be 60 Bookholders anything of interest to listeners to eavesdropping has reared its ugly held on 3-4 February between 1200 3 C Gibbs put in the column, and from this head recently and is at present and 0900. Full rules will appear one you will see that I would like causing a great deal of concern in soon in 'Contest News', but I know 80 Booldtolders some SWL input to HAB and some the corridors of power. Signals 1 R Shecineard SSB that some established listeners will more Newcomers to write. So, until which are fairly structured, such as be delighted to know that an LF business on VHF. Jeff shared the next month. 73. the drive signals to a VDU, can be event is to be re-instated in the view about some CO calls being The deadline for the Christmas reconstructed reasonably easily. Contest Calendar. unintelligible and garbled and also issue is Saturday 14 October. VDUs can now be fitted with EMI- felt, being an ex RN shielded windows which prevent Newcomers communications man, that if such eavesdropping whilst at the Jeff Smith, BRS92044, wrote for the everybody had a spell as an SWL, RSGB RECEIVING same time helping to reduce glare first time as a result of my plea for there might be better discipline on STATION LOG BOOKS and improve contrast. Another new SWLs to get in touch. He has the amateur bands! suggested remedy to the problem is been an SWL since April and has I hope that more newcomers will Only £3.79 to the use of 'scramblers' which heard around 80 countries on HF so drop me line in the next few generate extra signals to prevent far, including AP2ZR, FY4FM, months. I am always interested to members sense being made of the data. It HL1EJ, JA7AER, LU9FFD. VK3VKL. read of other SWLs experiences. £4.46 to doesn't take too much imagination 5N2MS8 and 9K2CS. He also and will gladly put the best non-members to see the dangers of that so-called monitors SSTV using a Spectrum offerings into the column. solution! 48k computer. An FRG7700 is the Available by post main receiver with the VHF Early News of Society's from HQ Spray Paint Converter and antenna tuner. A SWL Contest If you or a neighbour are suffering dipole received the signals on HF As the deadline for entries See page 45 for ordering details from direct breakthrough into a TV and a 10 element yagi does the approaches, the number of entries or radio receiver via its plastic

RADIO COMMUNICATION October 1989 63 cabinet you can now screen the UHF TV coax cable. As the years go as a stimulus to further discussion: Chairman, and the meeting was product with a plastic RF-proof by, the outer sheath of many cables a) Try to avoid having breakthrough chaired by Dr John Allaway. The coating. Radiospares, who also are produced with larger and larger problems from the start by EC Countries were well represented provide the home constructor with holes and its wire construction gets practicing good radio and many of the Region 1 Countries components via their Electromail thinner and thinner. You only get housekeeping, particularly in the were also present. After much outlet. now sell a metal-based what you pay for! siting of antennas. See page 20 of discussion the following resolutions plastic paint which is designed to A member has written in the 1989 Call Book. This probably were passed: prevent computer generated RF reporting interference from his won't stop you having the 1 That EC Matters are taken care of radiation affecting nearby radio transmissions to one of his problems, but at least it will reduce by a special body formed within the receivers. extension phones. The problem was them to manageable proportions! IARU Region 1 following IARU The same paint can be sprayed satisfactorily cleared up by the use b) Where conditions do not permit terms of reference. onto the inside and back of radio of two TMP Electronic Supplies an ideal set-up (and this must apply and TV products to form a thin RF- 0.25" split beads, which are taped to to most of us) take extra care in 2 That the 12 Amateur Radio proof screen. The Radiospares part the lead where it entered the phone. operating. Everyone knows that is is Societies within the EC nominate number is 551 570 and the price is It was interesting to note the other good operating practice to use only their Representative within two currently around £14 for a 365m1 phone (made in Taiwan) connected the power necessary to give months. aerosol can. The paint is touch dry to the same socket had no satisfactory communications, but 3 That these representatives form in 15 minutes, full conductivity can problems at all. do we all do it? the EC Committee of IARU Region be obtained after 24 hours, and a c) Consider using 'EMC friendly' 1. One Society produces a large radio and television modes where possible. Generally Conference Paper for the next manufacturer is currently using it to In the meantime FM gives less trouble than SSB, and Region 1 Conference for approval prevent VHF signal breakthrough There is no doubt that the world of CW scores because it allows you to of this Committee. into TV and VCR IF circuits. EMC is buzzing with activity, both in use much less power for a given One practical word of warning. professional and amateur circles - contact than either of the voice 4 That LJBA is kindly requested to Spraying is best accomplished out- indeed if paper could cure the modes. (See Amateur Radio co-ordinate the activities with the of-doors and the product should be problems we would be home and Operating Manual, Third Edition, EC in the meantime, and to left standing in fresh air for a few dry! Most people are pretty p20). At first sight it looks as if organise the first meeting of this hours before reinstallation so as to unenthusiastic about official RTTY and the new data modes Committee within 6 months, to elect prevent a build up of acrylic fumes documents but in this case the should be 'EMC friendly' because of a Chairman and Secretary. and to in the domestic environment. mountain is working in our favour. the basic modulation technique and formulate policies. It is generally agreed that the major because they require less power for 5 That all other Societies with an Ferrites problem on the amateur EMC scene a given contact than SSB. I would interest in EC Matters are invited to Although the Mullard FX1588 toroid is poor immunity of domestic be pleased to receive comments join as observers. has become a standard weapon in electronic equipment. Of course. from users of the data modes, The next meeting is being arranged the TVI armoury. it is now there is nothing new in the particularly where the performance in Brussels with the European becoming difficult, and at times breakthrough problem - one Old of several modes can be compared. Commission in September. expensive, to obtain. An alternative Timer used to tell a story about the d) Try to tone down the local club A meeting took place on the is to use MW ferrite rods which are trouble he had when the first know-all who tells any newcomers Sunday morning of a sub- both cheap and readily available at 'talkies' came to his local cinema that the way to deal with RFI is to committee dealing exclusively with local radio rallies. and his top band AM OSO came bluster and threaten everyone in the problems of EMC within the EC. Both the FX1588 and the ferrite over loud and clear in the sight. Breakthrough may not be our Some very useful work has been rod will require some 15 turns or so auditorium - but things have got fault, but it is definitely seen to be done during the spring and early in order to block 3.5MHz and higher worse of late simply because there our problem. summer, and a number of countries frequencies from being conducted are so many more electronic e) Keep a simple breakthrough kit had improved their relationships along mains, loudspeaker or coax gadgets about. ready, and respond quickly to any with their national organisations. cable. When winding onto a ferrite The good news is that the complaint. Nothing impresses a The EC EMC Directive has now rod, the winding should start at one authorities in the UK and other EEC neighbour so much as fixing his been fully approved and issued, and end and continue to the other, so countries are presently drafting problem in a few minutes. A work is continuing on providing a flat spiral coil. A ferrite documents which will define suitable kit is described in the 1989 implementation agreements. The ring should be wound so that the 15 standards of immunity for all Call Book, p22. policing of the new arrangements in or so turns are spaced evenly so manner of domestic and industrial f) It is advisable (if funds run to it) 1992/3 has still not been agreed, that the leads into and out of the equipment and these will be for all Clubs to have the full, boxed but the DTI intend publishing a winding are not running parallel. obligatory. The bad news is that filter kit which is available from HO, Discussion Document in the near This is to prevent coupling between although these are intended to so that it can be loaned out. future. If you wish to obtain any the input and output connections. If come into force in 1992 it will be information on the EMC Directive. possible, there should be 180° some time before they become contact the DTI at Waterloo Bridge spacing between these leads_ really effective. In a nutshell, things European Meeting at House, London, who will provide In both cases, the ferrite ring or will get worse before they can get 'ham radio' 89 the information free of charge. An rod should be installed some 15cm better, and the way the Amateur A further meeting of the EC article on the EMC Directive will countries took place during 'ham or so from the receiver rear panel to fraternity handle their problems appear in RadCom later in the year radio 89' at Friedrichshafen, West prevent direct radiation of RF from over the next few years could be and a full update on the latest Germany, at the end of June. The the lead or cable effectively crucial to the maintenance of the situation will be presented. bypassing the filtering action. good image that Amateur Radio still first meeting of the group occurred enjoys. It is perhaps worth earlier in the year when it was Cables remembering at a time when we are agreed to consider the formation of RF radiation from your station's trying to attract young people into a European Amateur Radio EMC helpline feedlines is only as good as the Amateur Radio via 'Project Year' Association. The Society has installed an amount you spend on the cables. that nothing is more likely to deter Unfortunately a meeting of the EMC Helpline at the EMC Obvious perhaps, but there have the parents of young amateurs than IARU Region 1 EMC Working Committee Chairman's 0TH been one or two cases of RFI and the fear - however unfounded it Group had been arranged to to improve the service to TVI caused by the leakage from the may be - that they will have coincide with the EC meeting and society members who may poor weave of cheap cables. Do not problems with their neighbours. therefore there was a split in the have EMC problems. skimp on these: ensure they are the Well, what can the average amateur attendance of all interested parties. The service is available 24 best quality you can afford. do abàut it? Here are a few The RSGB was represented by the hours a day on 0329 239644. Incidentally, the same applies to suggestions, which may at least act President and the EMC Committee

64 RADIO COMMUNICATION October 1989 S TA N D A R D, AX700E SCANNER Standard have done it again! You all know how popular the C500 is, well now here is their latest dual bander — The Standard C150 super' compact 2m transceiver e the C528 (not to be confused with the having all the usual features that you would expect from Japanese only version, the C520), The a modern microprocessor e;Fi ali m F es t il I European version has all the facilities controlled radio - plus sev- 111111111: eral new ones. Extendable e R U n S that you want in a base station, let alone frequency range on RX a hand held!! Ill 52-904MHz * Direct 13.8V in for 5 Watts out. E * VHF 2.5W, UHF 2W with CNB151 Price £575.00 incl. PSU NiCad pack. * Dual displays * Power save function. 1 * Multiple memories. * Priority channel. e * Tone squelch (option). * Programmeable offsets. * Coded paging function. * Various scanning modes. * Programmeable step sizes. * 144-146 VHF, 430-440 UHF, 800- 975 Rx only. * Separate Vol. & Squ. controls for each band. **** HAND HELD **** ***REPEATER FUNCTION *** IMPORTANT NOTICE o Listed below are the names of the authorised dealers for Standard communication All this in a package just 55mm wide x products. Neither they, nor ourselves, will supply spare parts, technical information, 157mm high x 31mm deep (2.5in x 7in. service or accessories for equipment supplied by any company not authorised to sell x 1.5in for us technical people). Standard products. Parts and Accessories will only be supplied against quoted serial numbers. We are sorry to have to take this stance but to protect our customers we only import The price has not been fixed at the time equipment that has been manufactured to British Specification and this is the ONLY of going to press, so call into the shop equipment that we will service. and see it for yourself — or see it on our Please bear this in mind when you are deciding where to buy your Standard radio. stand at the Leicester show. AMATEUR RADIO COMMUNICATIONS * DRESSLER * BREDHURST COMMUNICATIONS * ARROW ELECTRONICS * PHOTO ACOUSTICS Norman. * WATERS & STANTON * RAYCOM * ELLIOT ELECTRONICS * PLEASE REMEMBER, WE ARE THE SOLE IMPORTER OF STANDARD EQUIPMENT IN THE UK NEVADA COMMS. AND WE ARE ABLE TO OFFER A FULL BACKUP SERVICE AND SPARES FROM STOCK.

BAaAYURO tre. ,• TRADE ENQUIRIES WELCOMED 400 EDGWARE RAD, LONDON W2 PLEASE 'PHONE 01-450 9755 01-723 5521 Tlx 298765 NORMAN * STRICTLY TRADE PLEASE * Normally 24M desoatcll OPENING TIMES 9 30am-5 30pm Mon-Fri 10am-4 30um Sat out ()lease allow 7 days G4THJ or dellyery 01 100M LOOK Al HF 7L1 1 1'4 1 I [4_ TIONS VilF-IINF TRANSCEIVERS RECEIVERS

!Zi • • I . 7, « IC-505 £529 • , • -.- IC-781 £4,500 50MHz. SSB. CW (FM) 3W/1 0W. HF. SSB. CW. RTTY. AM. FM. 150W.

IC-119000 £3,995 30KHz 1999.99999MHz.

IC-575 10W £1,042 IC-765 £2,499 IC-575H 100W £1,199 HF. SSB, CW. RTTY. AM. FM. 100W. 28/50MHz. SSB. CW. AM. FM. IC-87000 £989 25 -1000MHz. 1025 -2000MHz.

IC-275E 25W £85 5 IC-275H 100W £1,039 IC-726 £989 IC-1171E HF/50MHz. SSB. CW. AM. FM. 100W. 100KHz - 30MHz 144M Hz SSB. CW. FM. LINEAR AMPLIFIER IC-4KL £5,475 HF 1KW

IC-475E 25W £1,185 IC-725 £759 JJJJJJIIWIW WJJ IC 475H 75W £1,250 HF. SSB. CW (AM.FM). 100W. 430MHz SSB. CW. FM. FULL RANGE, EXCITING I

lcom (UK) Ltd. Dept RC, Sea Street, Herne Bay, Kent CT6 8LD. Tel: 0227 362859. 24 Hour. Count on us! IC STER PL HANDHELD

IC-2400E FM 144/430MHz £635 IC-228E 25W £365 IC-2281I 45W £385 FM 144MHz IC-448E 25W £429 FM 430MHz

IC-2500E £675 FM 430/1200MHz

I 12GE

IC-290D 25W 144MHz SSB. CW. FM. IC-490E 10W IC-3210E FM 144/430MHz £ 99 430MHz SSB. CW. FM.

IC-24SET FM 144/430MHz £415 IC-2SET FM 144MHz £295 IC-1201 FM 1200MHz £520 IC-4SET FM 430MHz £310 IC-2GE FM 144MHz £265 IC-40E FM 430MHz £299 PRICES AVAILABLE UPON REQUEST IC-UX19 28MHz FM IC-32E FM 144/430MHz £399 IC-UX59 50MHz FM IC-9011 MULTIBAND £799 IC-2SE FM 144MHz £275 FM (SSB) 144/430MHz IC-UX129 1200MHz FM IC-4SE FM 430MHz £310 VARIOUS OPTIONAL FREQUENCY IC-UXS92 144MHz SSB.CW UX UNITS INCLUDE I> IC-UXR91 RX Unit FM.AM IC-120E FM 1200MHz £365 MEW MODELS, STAND El

144,1pautee Telephone us free-of -charge on 0800 521145, Mon-Fri 0900-13.00 and 14 00.17.30. This service is strictly for obtaining information about or ordering lcorn equipment. We egret this cannot be used by dealers or for repair enquiries and parts orders, thank you Cfflispetaltz Despatch on some day whenever possible. Viva Mcatereardsz letephone orders token by out mail aide, dept. instant credit & interest-free H.P. •_•• •.•

• I w kr • ALT RON I HEATHERLITE I ar..a.taint PRODUCTS COMMUNICATION I I HF HUNTER LINEAR AMPLIFIER • I EQUIPMENT • ALWAYS CHOSEN BY PROFESSIONALS AND DISCERNING RADIO AMATEURS. The ..... 11111111.1 e COMPACT LATTICE TOWERS Best . . .• _...„.., SLIMLINE TUBULAR MASTS of • ...- • .t. Telescopic—Tiltover. Fixed—Mobile from 3M lo British - .. v ..., ... 60M. Over 50 Models, suitable for a wide range of civil and military applications such as: • ,...•=1.-=; , • • Radio Communications • Amateur Radio • • CCTV and Surveillance 110.1 Designed for prolonged operating periods Heavy Duty Internal Power Supply • Meteorological Monitoring • Aero & Manne Nay Aids -- e IIIIIbi 1000 watts PEP SSB 0/P. 700 walls CW Of P: 400 watts RTTY 01P e • Flood Lighting etc. • Purpose designed using it • 5m and 3m WI Tuned Cathode liP CCT 50,, Tuned Pi Tank OfP Circuit 30-80 u: 3-5002 Triode • section modules for low re:gaoled 001 Drive required 0-100 Watts: 50 Watts to lull output is variable tram front panel control • ',eights and cost effective shipping I 1 • Engineered to BS l standards and hot • Op galvantsed- ta BS729 lei 1111.1 35 - :13MHZ. Aviateur Bands Manufactured in Britain using 70% British parts Protection Wind loads ate based on OS • CP3 CHAP V PI 2 1972 tor wind speeds I p to 100monr160kpli (BS9100) VISA Price £875 inc VAT •W CARRIAGE VI5 EXTRA ANTENNAS ei AO6-20 "SPACE SAVER' THE e Manufacturer of Power Amplifiers & Microphones • COMPACT 4 BANDER THAT IS • DIFFERENT. 2, 3 OR 4 ELEMENTS 75 St. Catherines Drive, Leconfield, 6, 10, 15 AND 20M. Unique Fully Sealed Coils. North Humberside HU17 7NY. TEL: 0964 550921 • Hi'CY—Close Coupled capacity • Ar hat loaded Yagi with optimized performance. Ideal GUIDE TO FACSIMILE STATIONS • for small spaces. 9th edition — June 1989 Send for full Spec. sheet. NO W! 320 pages. ISB N 3-924509-69-7 £14.00 or DM40.- Reliable and easy-to-use FAX equipment is now available for less than 200 GOP. It prints weather charts, press photos, satellite pictures etc. with excellent resolution via a standard Epson-compatible dot matrix printer on ordinary paper. The interest of mariners, yachtsmen, pilots, radio amateurs, monitors and • meteorologists around the world in the reception of FAX transmissions has subsequently exploded during the post three years. Aport from the hardware mentioned, the potential user needs detailed and up-to.date schedules of those FAX stations. Thot vital information is published since the early seventies in our intemotional reference books like the FAX GUIDE. The numerical frequency list covers 380 frequencies — from VLF to UHF — of FAX stations which were monitored in 1988 and 1989. Frequency, coil sign, name of the station, ITU country/geographical symbol, technical parameters of Y f the emission, and details, are listed. All frequencies were measured exact to the Q UALITY nearest 1 00 Hz. The alphabetical call sign list covers 228 call signs, with name of the station, ITU symbol, and corresponding frequency (-ies). Schedules of 93 FAX stations of 338 frequencies are listed alphabetically, including the latest schedules of Bracknell Meteo, the new METEOSAT-4 R ELIABILITY operational since 19 June 1989, and Royal Navy London. Additional chapters cover: K NOW HOW — Comprehensive list of equipment on the market for both FAX and meteorological satellite reception, with photos and manufacturer's addresses. — Detailed explanation of the technique used for the transmission of FAX • pictures, • V — Regulations on technical characteristics of FAX equipment, including all CCITT and WMO standard test charts. — Comprehensive list of both geostationary and polar-orbiting meteorological = Ele satellites, with full technical data. Detailed explanation of APT PREDICT and FANAS polar-orbiting satellite position data codes. WE DESIGN —WE MAKE—WE SELL—DIRECT — Rodio amateur FAX activities. At manufacturers prices—you get best value. —225 abbreviations. European Distributor — 61 station addresses in 36 countries. Classic International — 240 sample charts and their interpretation (thereof 24 from British stations). Roermond (N1)04750-27390 Further publications avoiloble are Guide to Utility Stations, Air and Moteo SEND S.A.E. FOR FURTHER DETAILS Code manual, Radioteletype Code Manual, etc. Write for detailed e AND PRICES OF ALTRON PRODUCTS. catalogue of publications on commercial telecommunication on shortwave. All manuals ore in the handy 17 x 24cm format, and of course written in English. Prices include airmail to anywhere in the world. Payment can be by cheque, cash or International Money Order. Postal Giro Account:Stuttgart 2093 75-709. H.P. TERMS ALLWELD ENGINEERING g Factory 6. 232 Selsdon Road, Dealer inquiries welcome — discount rates and pro forma invoices on request. South Croydon. Surrey, CR2 6PL. Please order from Tel: 01-680 2995 (24 hr) 01-681 6734 • Klingenfuss Publications, Hagelloch, D-7400 Tuebingen Fed. Rep. Ger many. Tel. 01049 7071 62830 • O M • • • Mb • I MO • • • I MO

68 RADIO -COMMUNICATION October 1989 AZDEN PCS 6000 2M FM RIG

+ "Free Scanning Receiver" 25 WATTS (RX108-180MHz AM/FM)

The Azden PCS6000 crept on the scene with very little announcement. Those in the "know" immediately realised its potential and snapped the first ship- ment up. By the time you read this we hope to have bulk supplies. So what is all 1 he fuss about? The basic transceiver is the same as the competition; 25 Watts of rf output, 144-146M Hz, 20 memories, auto tone-burst, excellent receiver sensitivity etc. On the face of it nothing to get excited about! But that's only the beginning, the next part is really exciting. The receiver coverage has been extended from 108 to 179MHz. Yes it covers the aircraft band with a built-in AM detector for reception up to 136MHz and a properly designed front end with AGC and 5kliz steps for offset-VOLMET transmissions. Above this range, reception is FM. The transmitter side has a programmable "tone" module which is also used to programme the tone-burst of 175011z. The shift frequency is also programmable and is made to error-out on transmit beyond the range 144-146M11z. However, this can be used in conjunction with the reverse repeater switch to instantly monitor duplex transmissions throughout the entire receiver range. What is particularly attractive is the ability to programme into each memory. a unique shift and if appropriate, a unique tone. This makes the rig somewhat unique when looked at in conjunction with the frequency range. Finally the price: most rigs arc well in excess of £350 these days. without all the above listed features. So for £329. we think you will agree that this has to be a very special deal indeed. HF TRANSCEIVER A "WORLD FIRST" in SCANNERS! DISCOUNTS! 25-1300 MHz* 25-1300 MHz* Handheld £299 Mini-mobile/base £79 Most transeivers are designed for 12 volts. The JUPITER II JUPITER 6000 manufacturer's own PSUS are *AM/FM expensive. But *Direct up/down tuning our FIEVEX "BIG *5. 10, 12.5, 25, 30 KHz steps *100 memories do alm. BERTHA" P300 is „.. 410 .... , lust as good and *10 programmable bands d« er 7ir "" a lot, lot cheaper. *Step change frequency Correction mu» Fully protected. *High speed scan 20 per sec. large flunky trans- *Carrier or audio scan former, and thermal Ian cooled! Below is a list of *Battery Saver autumn packages that we invite you lo consider. * Telescopic antenna (BNC) Part exchange welcome. Credit? Most certainly. *Fast memo load feature Just ask for quote. * Individual memory unload *Uses 4 AA cells • Skip Function *Size 7" 2.5" 1.5" Whether you want to bypass a single memory channel or an * 700 MHz first IF entire bank, this control provides the answer. Model Type Mfr's REVEX *Proper English Manual • High Speed Scan. PSU PSU *Superb sensitivity. Select high speed scan or search and you will whiz through *Does not cover 550-800MHz. the range at a healthy 20 steps per second! That means you Kenwood 'News -£43-1-b00. £1200.00 No other similar receivers offer the same °attires at anywhere can scan 100 memories in 5 seconds or 1 MHz of space (25kHz near the price! And inside the construct on is a Joy! Lots of steps) in 2 seconds It really works! Kenwood Ts' 40S -£41335-.-09- £959.00 space, nicely laid out boards all linked with quick connect • Fast Memo Write. Kenwood - N ews -£115800- £1080.00 plugs. Not a "Taiwanese Rat's Nest! Enables you to quickly write into the memories, no need 10 Yaesu FT747GX -£94-8,4A- £759.00 • Direct up/down control. select a number, Inc receiver will use the next empty memory. Yaesu FT757GX2 -£42-28:00- £1069.00 No need to punch anything into memories. Just enter • User Friendly Search Programm. Yaesu FT767GX --£48e8.00- £1699.00 Irequency and use up/down buttons tor manual or electronic You can search in either direction and change direction at the ICOM IC751A .48-7&00- £1589.00 tuning, press of a button Total agility with a speed lo match. ICOM IC735 -£-1-35-700-- £1069.00 • AF Scan. • Unique Multiband Programme. No more annoying blank carriers for the receiver lo lock on to. No less than 10 separate band segments can be stored in the ICOM IC725 -£4-1-37709- £859.00 Simply tell it to ignore carrierss not containing audio and it receiver's memory. will! • Total Flexibility. The basis upon which the receiver has been designed It The above priOe comparisons use the manufacturers • One Button Memo Read. nearest equivalent PSU to the P300. Each Roves is A single button lakes you directly into the memory bank. Up/ means you tailor the receiver lodo exactly what you want ¡Ile fully guaranteed for 12 months as is the matching down or scan will quickly move you around or use direct do, almost like having a receiver that was designed for your HF transceiver_ All mail orders against credit cards access for a particular channel number own personal needs. No other receiver can match it, feature for feature and the good news is the cost are despatched by 24 hour Securicor at our risk. If • Battery Saver. payment is made by cheque please allow an extra For long term single channel monitoring this bajura will World demand is tremendous. We are getting only small couple of days lor clearance. reduce battery consumption by 70% quantities so pick up the phono now and you could be lucky!

FREE CATALOGUE & PRICE LIST! We now have an illustrated catalogue of some interesting products for the radio amateur that we have never had the space to advertise. Also details of new items coming along. Just drop us a first class stamp and we will send you this plus our price list of over 700 items!

NE W! SHORTWAVE LISIENERS "CONFIDEIVI'IAL" FREQUENCY LIST. Now replaces old MIZUHO "MX" QRP edition of "UKCFL" Fully updated it is probably the most comprehensive guide available. £7.95 post SSB/CS RIGS Ill s1OND AERIALS etc. SX600 1.6.525MHz 5/20/200w £119.00 £189 X50 2m/70cm 4 5/7.2dB ...... £59.00 MSI Monitor Scope Pep etc £269.00 X500 2rn/70cm 8112dEl £129.00 £82.00 MISC OISON Discona 26-1300MHz . ADONIS AM303G Base mic £49.95 Now in stock these 2 £179.00 CLPS130 1-504300MHz beam 12dB . ADONIS AM503G Base mic £65.95 watt single benders £89.00 CLPS130.2 105-1300MHz beam 13dB ADONIS FX-1 Mobile Goose Neck £55.00 for 80. 40 or 20 metres £49.95 CP22J 2m 65dB base antenna... 2m 5/8th BNC telescopic ant. £12.95 are real beauties. VXO £14.95 M285 2m Mobile 5/6th PL259 LF 80/40 7011 dipole kits f 29.00 control (one slat supp- £30.00 EL77'0H 2m170cm Mobile P1259... 'Limpet' Rubber mag base. It won't move £19.00 lied) gives 25kHz seg- £27.00 NR72M 70cm mobile 55dB PL259 VHFIUHF Auband Guide 2nd Ed £5.95 ments on 80 and 40. £14.95 GIS Gutter mount/cable for UK Confidential Frequency List 9 and 50kHz on 20 met- £26.95 D24N Duplker 2m/70cms.. Secret of Learning Morse Code £46..955 res. Features IRT, £149.00 CP4 40-10m vert .1. radials Complete Guide To VHF/UHF Frequencies £5.95 noise blanker. S- £189.00 CPS 80-10m vert + radials Pocket Guide to RTTY 8 FAX Frequencies... £2.95 meter. speaker, morse Oceanic Airband Communications £3.50 key. BNC socket. VSWR METRSete (New Design) Powered from AA cells or external supply. Pocket SX100 1.6-60MHz 3KW... £6500 PLUS HUGE STOCKS OF KENWOOD: YAESU; ICOM size 66W x 39H x 142mm deep. As used by GBSRN SX200 18-200MHz 5/20/200w £65.00 DATONG: JAYBEAM: TONNA: etc. If its in this magazine we have on Ben Nevis. Over 100 in use already. Send for gen. sx400 140.525MHz 5/20/200w £79.00 probably gol it!

RETAIL & MAIL ORDER:' 18-20, Main Road, Hockley, Essex SS5 4QS. Tel: (0702) 206835, 204965 WATTIF?(-S RETAIL ONLY - 12, North Street, Hornchurch, Essex RWI11 1QX. Tel (04024) 44765 DTANTON Visa and Access by telephone. 24hr. Answerphone. GAREX ELECTRONICS PACKET RADIO WEATHER SATELLITE SYSTEMS FROM THE EXPERTS SPECTACULAR NEW ATARI ANIMATED SYSTEM Gares are proud to announce that they are the first appointed dealer for this PACKET TNCs PC TNCs incredible new Timestep product. Following on from TimestepS phenomenal TINY 2 + with mailbox £119 HSI Type 1 VHF+HF £139 success in the education market a special low cost Atari ST version of their KPC2 HF/VHF + WEFAX £159 HF MODEM for above £85 animation system is now available. Simply plug in your existing receiver to view amazing pictures. For the ultimate, add a Meteosat receiver for unbelievably KPC4 DUAL PORT £225 G3RUH MODEM for above £95 smooth 14 frame animation that is completely automatic once set up. Just watch ORS1 Type 2 Dual VHF £169 the clouds roll by' New pictures are added twice an hour if required, the oldest MULTI MODES being discarded automatically. This sophisticated package will run on any Atari MFJ 1278 9 modes £229 HSI cards are shipped with all software ST1040 and compatible colour monitor, comes complete with all software and needed inc split screen user software. colour-keyed Atari interface unit. £299.00 TX/RX of FAX + SSTV inc mailbox Optional 16 grey scale adaptor for colour monitor £24.95 KAM with mailbox £265 G8BP0 The Node software ai. AA4RE For those who would like a one-stop-shop, we offer the complete package of a BBS ready-to-run system: inc KA-NODE Meteosat Dish and receiver. Atari interlace unit, Grey scale adaptor. 14M Colour BBC EPRO M Monitor, Atari ST1040 computer. software (including demo-disc) AND, OF ACCESSORIES AMFAX eprom £19.95 COURSE. ALL PLUGS AND CABLES. We stock leads lo connect the TNCs to On your doorstep £1,695.00 Terminal + FAX on screen most radios and computers. Software Prices inc VAT. p-i-p extra NEW COMMODORE "AMIGA" INTERFACE AND available for many computers Prices subject to change SOFTWARE Superb high resolution pictures 600 pixels x 400 lines. Compatible with "PtXmate - ,O WE STOCK ICO M RIGS AND THE fully featured image processing program £299.00 ICO M MOST OF THE ACCESSORIES COMPACT FRAME STORE SYSTEM The basic MICROWAVE METEOSAT system, no complications, a complete plug SEND TODAY FOR A COPY OF OUR in and go package requires no computer, no software, and can be up and running. including dish alignment within 10 minutes. Nothing more to buy: Dish. Microwave LATEST 16-PAGE CATALOGUE Receiver, Frame Store. 12in b/w Monitor AND ALL PLUGS AND CABLES OR COLLECT ONE FROM OUR STAND Designed by Timestep, supplied by Garer £995.95 AT LEICESTER. SATELLITE ACCESSORIES PRICES INC. VAT P&P EXTRA. Meleosal Receiver. Dish input and 2 watt audio output £270.25 Meleosat Preamp. 15dB gain 0.6dB noise figure GaAs FET £92.00 CREDIT NOAA 10 channel VHF Receiver £155.25 Crofters. Harry Stoke Road AVAILABLE NOAA BASIC Turnstile antenna £34.95 Stoke Gifford. NOAA BASIC Preamp. 3 pole filter, boxed, 14dB gain £24.95 SAE for full details and prices of other Separates' Bristol BS12 6QF1 * * * * ACM (0272) 699352/559398 GAREX VHF RECEIVERS *A simple but versatile design capable of covering spot frequencies in the range 25-200MHz. * Excellent sensitivity (typically 0.4uV for 12dB SINAD) *Double superhet (10.7MHz and 455kHz IFS) ' GREAT NAMES from RADIO SHACK *Choice of IF bandwidths from "W-SAT" to "12.5kHz" PMR standards. *The basic receiver is single channel crystal controlled. The latest one is YUPITERU! - for the MV -1.-5000.1opiter It hand held scanner. *Multichannel option. 11v Yiminv Crickets this little unit covers 25-550 MI lz AM/N ['NI and 800-1,300 *2 watt audio output stage having a low quiescent current. M Hz NFM with 100 memories and 10 search ranges for only £299. This one from *Size: 153 x 33 x 13mm * Requires 10-14v DC supply a manufacturer who is not as oell known as THE RIG TIIREE. Amazing isn't it! PRICES Stock Versions> (fully assembled, aligned and tested boards) 6m. 4m, 2m and weather sat £49,95 Economise with the 16 channel Beareat 11C-200Fli scanner that include , Crystals extra, prices on request. search facility for £99.95 and the 200 channel BC-200X1.T handheld at £249. *Mains power supply module £15.50 From AOR the AR-800 at £199, AR-900 at £235 and tlw AR-2002 for £48 7 Other frequencies, special options, cased versions POA Hand held 200 channel PRO-34 for £249.95 with Ni-cads and charger and he 4(X) channel PRO-2005 for £329.95 we should also have the latest in this series GAREX VHF PREAMPLIFIERS the PRO-2024 at I:179.95 by the tinte you read this. Do not forget we sell the * MINIATURE - GENERAL PURPOSE * IC-R7000 in original. unmutilatcd. factory spec.. for only cm and the It- *Compact size: 34 x 9 x 15mm *up to 26dB gain *Can be made for any frequency in the range 40-200MHz R9000 for only e n' *3dB bandwidth •3MHz (al 145MHz) *Low noise Transmit on 2 wtth the new IC-2SET £295 and the latest goodies from ICO M. * Input and output impedance 50 ohms Kenwood's mystery package will be unveiled shortly and we will be happy 10 *1dB compression • 10dBm * Saturated output • l5dBm send you the details. Yaesu as well will quote for whatever you fancy. We have *Supply voltage 8-17v DC at 5-10mA brand new Rockwell-Collins K W M-380 III; transceivers cheap. Used Make Stock Versions (fully assembled, aligned and tested boards) 6m. 4m, 2m and Weather Sat £11.45 equipment in stock. Drake owners get on to our list for useful items etc.. that Airband 118-136MHz (reduced gain) £11.45 turn up. Other frequencies in the range 40-200MHz £13.75 ST O CK CLEARA N CE * HIGH PERFORMANCE We arc elearmg Old ancient and modern treasures. trom WW2 manuals re present day * 2 meter PRE-AMPLIFIER computers. including antennas! Come arid t101) 1,n Jaybeam. Hustler. Ilygasu *3 band-pass stages for improved selectivity and the Avarai 10m Dual Diversity 2 element Quad Mr ti89.951. , name hilt â kw! Do you *16dB gain with 1dB NF *Switches 35 walls want tu, save more? (in spend less, depending .111110w you bud. al WI. II you are serious we *RF switched (fail-safe action) . gas-filled relays can do you a money savingileal on C onlpUIrP, O M Matrix I If I aver Printer, lire liSi 110,1:r Assembled, tested pcb £42.50 ends hut goes on and on...

70 RADIO COMMUNICATION October 1989 ARROW FOR THE BEST DEAL IN AMATEUR RADIO!! NEW KEN WOOD HF. TS-950S NEW! IC-24E re4e2, 4› JUST RELEASED! ICOM mini dual bander :.0) SEE THE FIRST ONE - ., --- - - 2M & 70cms FM .,_,.4.--, .ON STAND 33 — b-- +,:- LEICESTER! DISCOUNT PRICE £399 ,r. ._,.__. i, ,. ,_ . , 1---A. z-1---.. - incl. nicad, charger •...... -...... ---• ...... ---.,- ' 7- - - • - Price on application

' .. FT747GX SPECIAL FT47OR DUAL-BANDER ,., TS140S — FREE CREDIT - HF Mobile ae Y su's famous mini for F Superb HF mini il e. - ac„--.\- ¡i,....a £599 BARGAIN PACK 2m & 70cms Handy. from Kenwood. Dep: £173.00 + 6 ty o e- -) •Fr."! iit \ INCLUDES FM & ONLY £245.00 MICROPHONE!!! INCL. nicad & charger. '' payments £114.83. IC — 32E NAVICO AMR1000 TR751E — FREE CREDIT Best value yet in Dual 1,1+ A great 2M FM 25W Mobile. EXCELLENT 2 Metre Band handy's , /-;,---' SPECIAL PACK performance from this ARROW PRICE £369!!! price £247.00 with , great allmode rig. (Incl. nicad & charger) .4, FREE MOBILE ,/, ( *ye e ige t eift Dep: £199 + 9 ANTENNA GUTTER MOUNT. payments £44.44.

BJ 200 "BLACK JAGUAR" .,,...\.•.,..:- FT736 V/UHF Base NEW! IC2400 FREE CREDIT Excellent value at £189.000 •••,‘,„, _ SPEC IAL NEW ICOM 2M & 70CM DISCOUNT PRICE. £1275 , ,_. , ' i.7.!' PRICE -7....—. ------i FM 45 W Full Duplex. (Note these are _ 0.. • • simultaneous receive.. . ,.. MO M MK Ill model) .. ).• vaili "' t ' e DESK MIC! 7:"_...•.:'.7:77:L-: . £211 OP. + 9 -,.. \ 4•5ih, -II là % payments £47.11. NEW! OMNI V 1 A IC2M -2microSE Handy & a SCANNER! Comes complete .,...4-: -. -- 12 1a25 with nicad, charger & receive. _ _:-_-... -' Extended 80-190Mhz! _ . ...« ,—,- ..... DISCOUNT PRICE £249 " e e -i. --ii -it : — m e a m uni _...... ,...• • • • • • -- IC-4SE ii- ! -*.er•-• --V- -V--. ••• - - .. .. -- A mazing micro 70c ms handy ..• BI M W M U M e with nicad + charger. Receives 380-500 & 800-950 Mhz!! TEN-TEC's latest HF. DISCOUNT PRICE £279. TOP -OF-RANGE INTRODUCTORY DISCOUNT PRICE = £1739.00 R-7000 IC-726 ICOM HF MINI IC735 FREE CREDIT ICOM's superb VHF/UHF/ SHF receiver A really great rig HF & One of the best HF £895 DISCOUNT z..,..-- 10--. :.- SIX.AM/FM, Microphone, - - - mini's ever. •-••11. . 1+- , PRICE • ;ei --rii.f,e, ‘ 1'1; e64 general coverage receiver, _• m e ,•: £325 dep. 9 payments e .+;.....' ''' -T.• OR £90.00 dep. + 18 • .---,--= ‘_1 7, ' a" DISCOUNT PRICE £899.00 - £72.67 . 'D ' Cr 'e payments £56.08

Finance arranged subject to status. APR typical 34.4%. Written quotations on request. COMET ANTENNAS COMMENT An excellent pellorrna(iec combined vetn bUpi quallty at it., BARGAIN pnce Irani ow I don't often blow Arrows "Tru mpet: but if you are buying a new piece directly imported range including' al equipment this year. either at the exciting LEICESTER show (27th &

pi ma woo mood, 144/437 co 15r85 79M CA.ABC22a Base Culin 1M 6 SOB 2 87M t36 00 28 th OCTOBER) or any other time. it will pay you (AND I DO MEAN , 150W £l4 95 CA.ABC73 Base Colo 7M 7 8484 Su 659 50 PAY YOU) to call ARR O W. (STAND 33 LEICESTER). £4123.1 Mum snoble 144(437 2 15(3888 5M 5005285E 5/8 Wave met 144 £1500 With our buying power we can get the best possible deals from the ilia .._ 150W f 16 75 £A.R002 BNC loaded tele warp tor IlarKlys £12 95 AUTH ORISED DISTRIBUTORS in UK. YES ARROW are • cin25a Mdbae 144/432 315 588 93M 170W £29 95 Cornet Meters NEW! AUTHORISED DEALERS FOR ALL WE SELL . ' CR.701 Mobile 144/432 3/5.5013 200W £24.22 C0120 SWR.Peredu 1560/7001N with PEP 8 I'm list ing in th is ad EXA MPLES of th e fa bu lous dea ls we can o ffer CA-2x460 Base 144(437 4 5r108 7 0761 Fr averaqung 1 82008111.7 £86 95 yo u as the UK's LAR GEST INDEPENDENT DEA L ER . £52 50 CO2701) SWR u Powe as ab,s rot IQ. ARR O W will take your part exchange as deposit for Finance, even CA.2x4WX Base 144/432 6 51948 3 sapa fi 525Mlu £18 95 INTEREST FREE CREDIT deals, andy ou can make the deals Glass.. . . 674 00 176X1400 Weenier loe 50/144/432 Mar £33 40 and see the gear at any of our AGENTS or SHO WR O O MS . CA-2X4SUP Base 144/432 618.448 254M 669.00. CAlx4 MAO Sue q.ee 144/432 8 5(11 9811 5 4M Send SAE for COMET CATALOGUE.... 73's from us All Peter G3LST FrGiass £12580. (PS: This is my & OUR 24th year in I he Amateur Radio Trade) "

GLASSOW SHOWROOMS. MGR CREDIT CARD. Unit 17, Six Harmony Row. Govan. Glasgow. Uf gl VISAACCEPTED Scotland 651 389. Tel: 041 445 3060. ARROW ELECTRONICS LTD Hours 8.30.5.30 Mon.Fri. (Closed Saturdayi. YOUR ORDER CAN 8E TELEPHONED WITH CREDIT AGENTS 5 The Street. Hatfield Peyerel. Chelmsford. Essex CIV13 2EJ. CARO DETAILS & OESPATCHED IMMEDIATELY! LEICESTER — DAVE FOSTER Tel: 0533 608189 Tel: 0245 381616/381673 Fax: 0245 381436 WIGAN — JIM COOK Tel: 0942 713405 FREE FINANCE ON MANY MAJOR ITEMS AT RAP. ANGLESEY — JOHN LEWIS Te): 0248 714657 (Ask loi details ol quali)ying firm — Hours: 9-5 (Closed Thursdays) Latest calls 8.30pm please! see examples above'.

RADIO COMMUNICATION October 1989 71 Clayton Wood Close West Park D A T O N G Leeds LS16 6QE EL E C T R O N/ C S LI MI T E D Tel: 0532 744822 Fax: 0532 742872 For products you can rely upon to give amazing results For information on Active Antennas, RF Amplifiers, Converters, Audio Filters, the Morse Tutor and Speech Processors send or telephone for a free catalogue and selective data sheets as required. All our products are designed and made in Britain. Orders can be despatched within 48 hours subject to availability.

VISA - V/SA AND ACCESS WELCOME - D111)))) STEPHENS-JAMES LTD. VISA 47 Warrington Road, Leigh, Lancs WN7 3EA. Telephone (0942) 676790 Turn at the Greyhound Motel on the A580 (East Lancs. Roadl.

LAN CASHIRE & THE NO RTH W EST'S LEA DIN G RETAILE R IN AM ATE U R RADIO. ANTENNA RANGE Kenwood Range Receivers Cushcraft TS940s HF Transceiver £1995.00 AR2002 Scanning receiver coving A3 3 Element Tribander Beam £329.00 AT940 Automatic Antenna tuner £244.86 25.550MHz and 800-1300MHz ...... £487.00 £87.55 A3 4 Element Tribander Beam . . . .. £353.35 SP940 Speaker with fillers R535 Aircralt Bands receiver coving £1138.81 10.3CD 3 Element 10m Monobander £115.04 TS440S HF Transceiver...... 108.143 and 220-380MHz £249.00 £144.82 15.3CD 3 Element 15m Monobander £139.70 AT440 Automatic Antenna tuner 11537 Handheld Aircraft Band Receiver...... £69.50 20-3CD 3 Element 20m Monobander £238.21 PS50 20 amp power supply £222.49 Antennas and accessories for above stocked. AP8 8 Band Vertical 2511 High ...... £164.35 TS140S HF transceiver, £862.00 HF225 General Coverage Receiver £395.00 £173.78 AP5 5 Band Vertical 2511 high £123.36 PS430 power supply AR900 UK Scanner £235.00 18 Element 2m Boomer Antenna £106.59 AT250 Automatic Antenna tunIrpj L1,1;. £366.00 WIN108 Handheld Scanning Airband Receiver £175.00 15 Element 2m Boomer Antenna.. .. £85.26 AT230 Antenna tuning Unit . £206.67 AOR 800E Hand Held Scanning FM-AM Receiver, Ringo Ranger 2m antenna ...... £42.95 TL922HF Linear amplifier £1495.00 75-105MHz, 118•136MHz. 140.174MHz, 407-495MHz. MC50 Base station microphone £46.00 R5 New 5 Band Vertical Roof Mounting. 830.950MHz. £199.00 MC60A De Luxe desk microphone £88.22 New Model, Jupiter Mk11 Hand Held No Radials £259.00 TR751E 2m Mullimode Mobile Transceiver £599.00 Scanner £299.00 03W 10-18.24 MHz Rotary Dipole £159.00 TM2550E 45 watt 2m Transceiver . £465.00 Datong Range Butternut TM221E 45 watt FM Transceiver £317.00 A0370 Outdoor Active Antenna £77.62 HF6VX 6 Band Vertical Antenna £159.00 TM42IES 70cm 35 watt Transceiver £372.00 AD270 Indoor Active Antenna £58.22 HF2V 80/40 meter Vertical . £142.00. TS680S HF + 6m Transceiver £995.00 070 Morse Tutor £63.40 All Butternut accessories available TM721E FM Dual Bander £699.00 MFJ Accessories Range Hy-Gain Antenna Range available TH25 2m FM Handheld Transceiver £256.00 MFJ1701 6 way Antenna switch £30.72. daybeam TH205E 2m FM Handheld Transceiver. £215.00 MFJ910 Mobile Matching Unit. .... £20.42 TB3MK3 3 Element Tribancler £348.85 TH215E 2m Handheld FM Transceiver £252.00 MFJ300 wall dummy load £28.35 TB2MK3 2 Element Tnbander £234.60 MFJFIF Noise Bridge ... £63.10 TH405E 70 cm Handheld FM Transceiver £288.00 TR1MK3 Rotary Triband dipole £117.30 MF.) 815 2KW Cross needle SWR/Power R5000 General coverage receiver £875.00 VR3MK3 Tubant Vertical £81.65 meter £57.32 VC2OVHF Converter 108-174MHz..... £167.21 004 4 & 5 Element Beam £129.37 Daiwa R2000 General coverage receiver ...... £595.00 4y16m 6m 4 Element Beam...... £54.05.. CS201 2 way Ant Switch ...... £14.00 VC1OVHE Converter 118.174MHz. £161.95 5 Element 2m `Mgr ...... - ...... £20.53 CS4 4 way Ant Switch BNC Sockets £30.39 8 Element 2m Vagi £26.28 HS5 De Luxe headphones £37.54 NS660P 1.8-150MHz + PEP Meter._ £115.00 LF30A Low Pass Filer • £34.00 Antenna Tuning Units TM231E 50 Watt FM 2M mobile £289.00 Rotators Kenwood AT230.. £208.00 GS400C £169.00 MFJ 9628 1.5 kWE Versatuner TM431E 35 Wait FM 70cm mobile...... £318.00 TM701E Dual Bander 25 Watt £469.00 GS600C £219.00 MFJ 949C 300W Versaluner...... £15700. Daiwa MR 750E . £254.00 MFJ 300 Watt Basic ATU ...... £105.00...... RZI Wide Band Scanner £465.00 "TEN TEC" CDE AR40...... £168.72. MFJ 1601 Random Were Tuner £42.00 CO 4511 £219.00 Global AT1000 SWL Antenna Tuner £69.00 We are pleased to announce we are the northern slockisi Power Supplies Welz tor the lull Ten Tec range PS120M 3-15V variable 12AMP max £79.50 D130N 25-1300 MHz Discerns Antenna . .., £79.00 "PARAGON" Transceiver + General Coverage PS30MX 30AMP PS.) £129.50 DCP5 5 band trappes vertical with radial kit £195.00 .£1839.00 DCP4 4 band vertical..... £145.00 "CORSAIR" amateur band transceiver £1200.00 Stockist for Heu microphones, Mirage amplifiers, Global "ARGOSY" mobile transceiver . £589.00 Publications by RSGB and ARRL. Full Range of SWR/Power Meters, Post/carnage charged at cost. Antenna I raps. Insulators. etc "CENTURY" CW only transceiver £399.00 Full size LibHV Antenna - - £16.50• New Model "Omni II" Amateur Bands Only Transceiver Our secondhand list is updated daily. Please send SAE for this or any information. Hall size G5F1V Antenna. £14.50 Full range of accessories, Pius - Filters - Shop Hours 9.30 to 5.00 pm Mon. Fri 4.30 pm Sal Carriage/Postage at cost Microphones.

72 RADIO CO M M U NIC ATIO N October 1989 ICS Electronics Limited Unit V, Rudford Industt la! Estate. Ford, Arundel, West Sussex. BN18 OBD INC Telephone 0903 731101 Facsimile 0903 731105 NEW ICS PRODUCTS FOR THE AUTUMN

AMT-3 Low Cost Amtor/ RTTY Terminal Unit

Amtor is by far the best mode for HF data com- munication. The AMT-3 is a proven, third genera- tion product from ICS with firmware design by G3PLX. Amtor is now as cheap as HF packet. - AMTOR, R'TTY and CW ¡dent modes - Excellent tuning and status indicators - Split screen IBM-PC support software and mounting stand included free of charge. £169.95 inc VAT plus £5.00 p+ p

MET-2 Low Cost Meteosat Receive System

Metcosat gives detailed cloud cover pictures of Europe every half hour - just like on the TV weather forecast! The MET-2 sets new standards in price and quality. Provided you have an Amiga, Atari or HIM- PC computer, all that you require is the matching MET-2 system package. Each package consists of a receiver, preamplifier, cables, computer interface software and detailed manual. Everything you need except the computer. Never before have such high quality systems been so affordable. Prices from under £600.00

Please send your new catalogue PK-232 Personal Mailbox Upgrade My name and address are:- Includes new seven character Amtor scicalls and TDM (Time Division Multiplex) modes. We should have stocks shortly after this advert appears. Call for price and availability

DSP Multimode Data Terminal Unit

AEA's latest top of the range product - as shown at Dataspace '89. State of the art Digital Signal Process- ing. Lots of new modes. PK-232 compatible. We will have the DSP units when they're available, but prices will be significantly higher than the PK-232.

Send to:- Send now for our new free ICS Electronics Ltd., Unit V, catalogue, covering these and many other exciting products. Rudford Industrial Estate, Ford, Arundel, West Sussex BN18 OBD Simply clip the coupon opposite.

VISA

RADIO COMMUNICATION October 1989 7,3 0 RE

'as. 11seynirII SupplyAMP NA% 7411' r.o. 111• — • PRICES (Including VAT & Carriage) 13.8V LINEAR POWER SUPPLIES Self Resetting OVP 4 Amp £ 53.13 Thermal Trip 6 Amp £ 78.72 Regulation <1% 12 Amp £104.71 Ripple and Noise <10mV Pk-Pk 24 Amp £151.34

Other Products VHF Wavemeter £ 33.29 3 Way VHF Switch (SO 239) £ 18.69 3 Way UHF Switch (N Type) £ 24.15 2 Metre Preset A.T.U. £ 17.60

We also design and manufacture custom power converters for Telecoms, Railway and Industrial applications.

Fl 121a1:irhfribfittiplpr LIMITED Farlington, Portsmouth P016 1 TT Access

Telephone (0705)372004 A I L Fax (0705) 326307

OPEN MON -SAT 9AM-5.30PM 191 FRANCIS ROAD, INTEREST FREE HP FACILITIES AVAILABLE LEYTON, LONDON E10 6NCI. ON MANY ITEMS PROMPT MAIL ORDER =M M. TELEX 8953609 LEXTON G PHONE 01-558 0854 01-556 1415 dress or 111111 COMMUNICATIONS LTD. Pnces correct at t,mi- al owno to p3005 Please phone for latest QUOIC FAX 01-558 1298 SPECIAL OFFER NEW MODELS STANDARD AUTHORISED DEALER AOR 2515 5 MHZ-1500 MHZ BEAT THIS PRICE AX 700 AOR 2002 62 Banks of 32 channels each scanning 32 50-904.995 MHZ 25-550 — 800-1300 MHZ channels per sec .3pv sensitivity VHF AM/ Panadaptor Display AFM. Very impressive radio, same size as FANTASTIC the AOR 2002 VALUE £575.00 £579.00 ALSO AVAILABLE £459.00 The now famous C500 dual band inc empty INC P.S.U. KENWOOD TH 75 dual band handheld 2/ battery case £375.00 70 £395.00 ALSO AVAILABLE C150 available. 2 mtr £230 KENWOOD TM 701 dual mobile RC20 t — 108-174 MHZ. 225-490 MH AOR 900 interface available £175.00 DRESSLER ACTIVE ANTENNAS AM-FM 830-950 MHZ YAESU FT 470 dual band handheld, 2 mtr 70 cms £385.00 ARA 900 SOMelt tu I 30051Hz HANDHELD SCANNER ACTIVE ANTENNA Goo I /OE lyour IN CHARGER £229.00 ALL YAESU STOCKED — PLEASE CALL TECHNICAL SPECIFICATIONS FOR ARA 900 ICOM R7000 inc ARA 900 £999.00 Gen Ihe tli 17043e flniency lime' 50 1300Natt ICOM R71 inc ARA 30 £855.00 1‘0...e 1 rete loll al CU 1001111 KEN WOOD 008 te00. 300L111.i ICOM R9000 Inc ARA 30 ARA 900, 1 MI Deer 150M14 TS 680 HF + 6 MTR excellent value £3,899.00 Utfl a,m,o .1001.0t •N'•TYPE-F149.00 INC: MICROPHONE ICOM IC 781 CALL 111(111 term 6501.012 1,1259 £139.00 4 see imegur ICOM IC 765 CALL "Z:110e 8'oOtlŒSo, Sotuuo' (J 0030+1 £895.00 ICOM IC 735 CALL ICOM IC 725 CALL ARA 30 ACTIVE ANTENNA ICOM IC 228 + H CALL TS 440 50 kHz . . . 40 MHz WITH LIMITED ICOM IC 3210 dual band CALL IGMBORMTIMINI pr PERFORMANCE UP TO 100MHz INC AUTO ATU ICOM IC 32 dual handle CALL . Pr DIfflend q14,1r.y. aruer 1 Yellh Very *de eiti(57«.,44 e a ICOM IC 2SE 2 mtr + AM AIR RX CALL dsuinut tins Wets proltsuonal demare 00Ib *elm. srd »Owed n £1,150.00 ICOM IC 4SE 70 cms + Cellphone AX I 7m lop glass loe tod Dactyl u tern% %veers' 5nus, the, alumnus lee hod CALL Ill ceemerc.a" and sa, mown systems £129 - 129. Sea 15ustual Vheless August 1985 R 5000 £799 ALL OTHER ICOM AVAILABLE Mot p 35 bsth 01,M1a1 cam am** v.th / metres 01 0.001e update R 5000 inc ARA 30 £899 Call 01-558 0854 pawn supply prol rouSels

74 RADIO COMMUNICATION October 1989 ELECTRONICS

IF IT'S KENWOOD IT MUST BE DE W S B U R Y

A FULL RANGE AVAILABLE TS-140S £862.00

SEE US AT THE SH O W O N STA N D R2000 £595.00 4 TS-940S £1995.00 EXHIBITION H ALL

r r iv10.70

*".. LC

am» , • le :: ow at stilt R5000 £875.00

TS-440S £1138.00 REP AIR S PROFESSIONAL THE FINEST DECODER IN THE WORLD INDUSTRIAL NOW WITH FAX FROM £895 - SAE DETAILS AMATEUR PMR Repairs and Service * 7 Working days guaranteed turnaround (subject to availability of parts) * 24 hour industrial service available * Collection and delivery of equipment, fully insured, arranged on request * Repairs to Kenwood, Yaesu, Icom, Ten Tec and all

types of marine com munications equipment STAR MASTER - KEYER £54.70

Stockists of DAIWA — WAVECOM — JRC — BENCHERS — VIBROPLEX — MICRO WAVE MODULES — TENTEC — YAESU — ICOM Dewsbury Electronics, 176 Lower High Street, Stourbridge, West Midlands DY8 1TG. Access Telephone: Stourbridge (0384) 390063/371228. Fax: (0384) 371228 Telex: 336712 SHELTN G. Ref. 02850 VizinfimijA AM\ Instant finance available subject to status. Written details on request. BREDHURST ELECTRONICS LTD, Bred/177st High St, Handcross, W. Sx. RH17 6BW electronics (0444) 400786 SITUATED AT SOUTHERN END OF M23-EASY ACCESS TO M25 AND SOUTH LONDON

RECEIVERS 70cms TRANSCEIVERS DATONG ANTENNA RANGE H1225 £396.00 £998.00 AD310 Achxe Antenna (77.52 300 J Beam - Thbander £361.00 ICA71 C855.00 • F: £69900 Mt.11,rende £145.54 200 J Beam 183 M43 - %bander £348.00 92000 ro Wow Tolo. £if3.40 7 So Budernet HAW% £159.00 £595.00 !te 4115E £245.00 VCIO VHF Conyerler C161.00 I .3SR Speech mecosst” £95,15 205 Butternui FIF20 £t42.00 1 re .1156 £288.00 FRG8800 £649.00 Cushcratt A3 Tnbander £283.00 FRV8800 VHF Converter £100.00 FT 739 - FnittiO £283.00 Cuteratt 2M 215W0 £88.25 05000 £875.00 / I 790011 £499 00 SAISI'.' wa, 507 01 £19.49 ' Tonne 205055 ale 5Ornnz £50.72 ir 71111Ft £349.00 re , 1.4 C26.99 Tonna 208099 ele 144mhZ £33.12 G Whip tribander. 10.16 6 20M £41.00 FT :VIZ. £375.00 £18 69 5fr t ',A 00 ea, £24 15 50 Il 4e,E £299.00 MORSE KEYS 11130 00 eel, 001. £30.39 • So ttiE £310.00 Kent rdo ,,e kev r It, £31.00 250 £862 00 P.11', 'A ,' ne.ii 7 )2•0,` £30.72 £985 00 £429011 ken' te, er•C.1 ,e er) £39.50 250 £1599 00 ,r1S.7e4 £20.00 200 £969 00 DUAL AND TRANSCEIVERS PALOMAR ANTENNA PRODUCTS tee ,,,,, 1 C22.00 200 £65900 1M 12 (699.00 Antenna Nolte Bridge - no.gtrt.,, 5,11 £70.54 250 £2499.00 15 /902 C1495.00 vor».,1,1, treed'. sld £66.33 2 90 F up to 100 mil: £.59.95 I 4/CR-FNBIO Benc.e , 802 [mom.: ease C76,97 250 t150000 £423.50 Tuner Toner - Time your MU FT36R £1359.00 £97900 TT 4700t1H £675.00 er,Motil Iransmdting £9.95 «759_00 1,7470 £423.50 LED SWR Meter - Auto SWR AKD HPF1 C6.75 I 00 £989.00 IC 32E £399.00 upto2kWpep £124.95 AKD 81.1,0 Weak, f6.75 I 00 Ten Toc Omer V £1839.00 IC 1210E AKD Notch finer £7.75 100 mew 9 1 Balun tor Ina T2FD Antenna £33.95 IC24COE £635.00 BUDS Lew pass Idler 6m £29.95 150 2M TRANSCEIVERS IC2500E £4175.00 HAND HELD RECEIVERS I.F30A Low hassfigeo (32.25 200 TF125E £218.00 /4,1 ,, A £6900 200 ANTENNA BITS TH2056 £199.00 (21900 700 1.1) lAlun t I SIW P P £13.95 I 50 TH215E £228.00 10 07000 £989.00 /ott,ext £115.00 700 BrIterron Balon .7 1 N W £13.80 I 50 TS71tE £898.00 (RO. 9400M £509.00 At ),1 011900 £235 00 200 Br.COrnrn 7IMHz Epoxy baps ¡pad) £10.95 150 TR75sE £599.00 1,12, £465,00 OWE' S Self Arnalparnahne tope ?OM . 25MM te.25 015 TM231E £289.00 All 7002 C487.00 T-pece polyprop Dipole coolie £1.60 025 UNOS 12/5E £74.75 500 F1230 • FNBIO £243.00 Sr. » eerar6 ,C egg msulators £0.65 020 R 035 £249.00 UNOS 12/70E £1711.25 5.03 FT411 • FNI310 £259.00 Standard AX7006 £575.00 1.4,00 ce,arn c et» CO 95 IMAI" £78.72 I«, F12900 II £429.07 [MAI £104.71 5.00 i F1211Fel £309.00 ANTENNA TUNER UNITS CABLES ETC C.11.1At £151.34 5.00 FT212AH £349.00 f 59 00 1.01M 67 taw loss coax 50 ohm per 50.95 025 IC2GE £265.00 0349 00 t/A 76 50 ohm coax the' Seen per merle £0.35 010 UR 10 10 ohm coat pe• metre £e.35 010 IC2900 £559.00 £208 00 GOODS NORMALLY 1.70 95 50 ohm coax cl.a 2 3mnt per metre £040 010 IC228H £38500 £366.00 DESPATCHED WITHIN 24 HRS 4rern Polyester Goy Rope 44001910e ',elm £0 25 Om IC275E Inc PSU £1069.00 PRICES CORRECT AT TIME OF £3/9 00 bOmirs 16 swg hard pe. wr, copper wee cio.os 200 £275.00 GOING TO PRESS - ESOE IC2SE £105 00 7549m Tenn FeeOzo Ligns Duly per ramie £0.20 010 ICZSET £295.91 MAIL ORDER & RETAIL (158 00 300 on. Sneed R,bbon Cable pe , meet. t0.32 010 BREDHURST ELECTRONICS LTD, HIGH ST, HANDCROSS, W. SUSSEX RH17 6BW (0444) 400786 Open Mon-Fri 9am-Spm except Wed 9am-12.30pm. Sat 10am-4pm

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76 RADIO COMMUNICATION October 1989 RADIO COMMUNICATION October 1989 77 C O N T E S T N E W S

ment. but it is hoped that all groups will paper, which differs only slightly in size 9. Awards. RULES comply and thus greatly ease the burden from A4 is a satisfactory alternative. (a) The Edgware Trophy will be awarded on the adjudication learn. Contestants Computer-generated or hand-drawn log to the leading affiliated society. should note the increased frequency allo- sheets are acceptable provided they (b) Certificates of merit will be awarded 432 MHz CUMULATIVES cation for this year's event: the top 20kHz of correspond with the HFC1 format, ie, to the overall second- and third-placed Dates: 13 and 29 Oct; 14 and 30 November the allocated band are dedicated as the forty contacts per A4 page. divided into at liliated societies, and to the leading Times: 2030 to 2330 clock time mot GMT). 'ORS CORRAL' - it is intended that operators groups often, and with the same columnar Scottish society. Use GMT on logs. less experienced in CW and contest tech- arrangement (see (b) below). Logs which (c) A certificate of merit will be awarded Sections: Single Operator Fixed, All Other niques should be able to make contacts are incomplete or illegible, or which to the station having the highest individual Scoring: Radial Ring (will be normalised by here in a more relaxed environment; expe- differ from the correct format may not be checked score. adjudicator). rienced operators using the segment should adjudicated. Adjudicator. Dr D A Yorke, G4JLG. 40 Edge play lair and keep their speed right down. (b) Logs must show, for each contact, the Ford Road, Worsley, Manchester. M28 40F. Contestants are reminded that those who following information, tabulated across Foreign entrants to Rules: as per 1988. operate in a manner not within the spirit of the page: (Time of OSO in GMT 1Callsign the event render themselves liable to dis- RSGB VHF contests of station worked jRST and serial number qualification, as do those who breach the sent to station IRST and serial number I have been asked lo look at the possibility rules. 1296 AND 2300MHz received from station 'Points claimed of allowing foreign amateurs to enter RSGB VHF contests. The following rules have 2. When. 1300GMT to 1700GMT on Sunday Duplicate contacts must be clearly marked CUMULATIVES been agreed with members of the VHF 14 January, 1990. as such, and not claimed for points. Dates: 21 October. 6 and 22 November, 8 Contest Committee: December. 3. Teams. Teams comprise up to live (c) Each individual log must be accom- A foreign amateur is allowed to enter any Times: 2030 to 2300 clock time (not GMT), stations. Each team represents a society or panied by an I-1F Contest cover sheet RSGB VHF contest (even though this may Use GMT on logs. group which is affiliated to the RSGB, and (form HFC2). properly completed, with not be specifically stated in the individual Sections: Single Operator Fixed, All Other. each society may enter as many learns as the declaration signed by the person contest rules) as long as the station entered Scoring: Radial Ring (will be normalised by they wish. Which stations make up which responsible for that station. is located within the boundaries of the adjudicator) team is determined by the society entering (sample copies of Log and Cover sheets United Kingdom (G, GD, GI, GJ, GM. GU. Adjudicator: DJ C,annings-Bushell. G4WAD, the event. Team placings will be determined are available from RSGB HO on receipt GW). 24 Almond Close, Evesham. Worcs. WR 11 by the total of the scores made by each of a stamped/addressed envelope. Larger The foreign amateur must be a member 6YH station in the team, alter checking. Club quantities may be purchased Examples of his/her own country's national society. secretaries are held responsible for the of both forms have been printed in RSGB and must be able to prove this when entry, and must include a summary sheet publications, eg Call Book, and may be entering his/her logs. A photocopy of any ERIC MOLLART (see 'Entries') for each team entered by the photocopied for use il so desired. Please relevant document is acceptable. MEMORIAL TROPHY club. note that contest adjudicators do not If there is no national society in the normally carry stocks of these forms). entrant's country of origin then this must be HF DF EVENT a. Eligible Entrants. (d) Entrants are requested to include stated on the entry form 427-86. The Dale: Saturday 28 October 1989. (a) Each entering society must be atfiliated with every log where more than 80 OSOs committee's decision on the validity of the Maps: OS Sheet 175 (Reading and Windsor) to the RSGB. appear, a checklist comprising the cal- entry must be then be accepted. Any query and 165 (Aylesbury and Leighton Buzzard) (b) Each operator of a team station must 'signs of all the stations worked. These regarding validity can be checked by writing Assembly: 1900 hrs for 1920 hrs start. be a member of the club he or she should be sorted into order, either fully to G4DEZ OTHR prior to the contest. Location: Peppard Common, NGR 709818 represents. The operator is not required alphanumerically, or by the first letter of Foreign amateurs will be listed separately, (OS Map 175) to be a member of RSGB. the suffix, and the serial number sent to and il sufficient numbers enter a contest, Competitors requiring a hot meal alter (c) All stations representing a club must each station should be shown after the then a certificate will be issued to tile the contest should notify Roger Shepherd. be located within a radius of 50 miles of callsign. The object of the checklist is highest placed entrant. Foreign amateurs G8WCH, tel. 0494 21063 by 21 October the normal meeting-place of the club. twofold - to assist the entrant in spotting will not be entitled to take 'Trophy awards'. 1989. Where a society has 'branches' eg RNARS, duplicate contacts, both during the event, The issue of certificates will be at the VHF each team may del ine a separate 'branch' if the list is completed as contacts are Contest Committee's discretion. meeting-place, and the team(s) entered made, and during log transcription; also Foreign amateurs who are also members by that branch will be considered to be 6 METRE CW CONTEST to aid the adjudicator in locating specific of the RSGB must also abide by the above entirely separate from those entered by Date: 9 December contacts for checking without having to rules, but there would be no need to show other branches, other than in respect of Time: 1800-2200 GMT search through the whole log. Club that they are members of any other society. at Sections: One section only. secretaries wanting advice or assistance RSGB membership must be noted on form (d) Each station may be single- or multi. Scoring: Radial Ring. with any paperwork problems (in respect 427-86 so that membership can be proven. operator, as best suits the club, but no Adjudicator: 64 WAD 01 AFS only, please) are invited to contact station or operator may represent more Rules: General Rules published in RadCom the adjudicator al the address shown than one affiliated society, or branch. January 1989 apply. Definition of major and Certificates for leading fixed station 5. Contacts. CW (A1A) only in the band (belet: . (single op), and leading other station. Each learn entry must be accompanied minor errors in VHF 3,510 - 3,590kHz. with the request that Full 0TH information to be exchanged by a Team Summary Sheet, which must Contests 3,570 to 3.590kHz be reserved for slower- contain the following information, and be (see rule 13). In an effort to make things a little easier for speed contacts (the ORS CORRAL). Any signed by an officer of the affiliated contestants in VHF Contests, the Committee stations, including overseas. may be worked society: have drawn up a list of errors that occur in for points. Name of team (eg RNARS Copenhagen 4 METRE CW CONTEST entries. I hope that you will understand that 6. Contest Exchange. FIST and serial number. we are trying to reduce the bureaucracy Date: 10 December Callsign of each station in the team commencing with 001. No points will be and thus hopefully increase the number of Time: 0800-1200 GMT Individual claimed score for each station lost if a serial number cannot be obtained contestants Sections: One section only. from a non-competing station, but any in the team Scoring: Radial Ring. Claimed score for the whole team contest exchange sent by that station Minor errors will be noted and corrected Adjudicator: J Pillags,G8HHI, 43 Bartons The normal meeting-place of the club/ should be logged. by the adjudicator (no changes will be Drive. Yaleley. Camberley, Surrey. GU17 branch made to contact information - it it's wrong 7DW. 7. Scoring. Each completed contact scores Declaration that each operator is a you will lose points as per normal). Rules: General Rules published in RadCom 10 points. Points may be deducted for member of the affiliated society January 1989 apply. errors or illegibility. Entrants are reminded (f) All entries from each competing Major errors will be pointed out to the Certificates for leading fixed station that each unmarked duplicate contact for society are to be sent in one package to entrant, and the log returned for correction (single op), and leading other station which points are claimed will be penalised RSGB HF Contests Committee (AFS), within a fixed time limit (eg a week from the at 10 times the claimed score, plus the Full 0TH information to be exchanged C/O. Knowles, G3UFY, 77 Bensham dale of posting back to the entrant). If (see rule 13). score for the duplicate itself; a total ol 110 Manor Road. Thornton Heath, Croydon, nothing is received within the time limit no points. Stations having more than five Surrey, CR4 7AF Packages must be reference to the entry will be made in the unmarked duplicates may be disqualified. results. AFFILIATED postmarked no later than Tuesday 23 B. Logs and Entries. January 1990. Entrants must ensure that Where an entry is clearly invalid leg a /P SOCIETIES TEAM (a) Logs must be typed or clearly written logs are well packed to avoid toss or entry in a fixed station event), a note will be CONTEST 1990 RULES on one side only ol RSGB HF contest log damage in transit. Packages which are sent to the entrant asking if it can be used 1. General. As in 1989. provision of a sheets (form HFC1) or on A4-sized paper, underpaid or bearing postage due stamps as a checklog. The entry will obviously be checklist is a request rather than a require- using blue or black ink. Standard fan-told will be refused. disqualified from the contest as an entrant.

78 RADIO CO M MUNICATION October 1989 C O N TE ST NE W S

Minor errors receipt of entry can be made and also that who enlered for an excellent sel of logs. Despite the fact that one Tx came on the 1. Missing zone information on the 427-86 notice of correction can be given If there is Certificates will be awarded to G4APA./13 air some seven minutes late (because it was n zonal contests: the entry will not be valid no SAE and an error is found, the committee and GOCDA/P in the Multi-Op section, and so well hidden that the operators had for a zonal award but will be accepted as an will not be responsible for lack ot response. G4PIO and G4BZP/P in the Single-Op and difficulty in finding it when returning to the entry. Regarding multiplier lists see 'County/ BRS31976 in the SWL section, site after their lunch!) the competitors were 2. Non-critical details of station equipment Country Multiplier Contests' information G4WAO pleased to hear two very good signals. incomplete. eg antenna height omitted. AX on page 80 of RadCom September 1989. Bearings were plotted and nineteen cars description missing. If you are thinking of using computer Seed On into the Northamptonshire coun- 3. Section omitted, but where other infor- generated logs. write to G4JLG. OTHR for tryside. Both transmitters were within 9km mation on the 427-86 makes it clear which information on what is required. RSGB HF -DF of the start and were about 5km apart. section is being entered. QUALIFYING EVENT - However they proved to be very difficult to 4. Location omitted, unless in a county SOUTH MANCHESTER find. multiplier event. VHF Field Day 1990 Station 'B' manned by G4YJP/P Steve. 10(11 1989 5. Best DX information missing or rendered Possible Changes was located in a brick built culvert in Dale The 1989 South Manchester Direction Find- invalid during checking. Wood. Generous amounts of aerial wire Every now and again I like to stir things upa ing Event was held on Ordnance Survey 6. Log sheets not collated correctly (uncut little just to see who is actually reading kept competitors running to and fro in the Map 118 (Stoke on Trent and Macclesfield z fold paper). woods until they finally located the Tx in RadCom. There is always an undercurrent Area) The starting point was at the premises 7. Serial numbers issued in duplicate or out the small tunnel, hidden behind a tarpaulin of concern, murmers, or the odd gripe of Mr Chris Plummer. G8APB, in a field of sequence (although this depends on screen, and requiring them to viade in ankle about VHF contests. The complaints range adjacent to his property. Two good signals how bad it is and how often it occurs in the deep water. from 'we can't compete with the big boys' lo were heard by all the competitors at log). Station 'A' manned by G4MZX/P Eric. 'we don't have the power, the equipment 13-20BST from the two hidden stations. was located in Blue Coven in dense under- the antennas' or in fact any excuse that Transmitter 'A' G3FVAJP 1985kHZ: Major errors growth and Blackthorn bushes. This Tx allows a group to lose gracefully; What I This hidden transmitter site was located 12 1. Declarations unsigned or not dated. proved just as difficult for the competitors would like to do is to see if we could change miles from the start on a bearing of 29* at a 2. Operators not listed. things a little (or a lot) so that skill becomes to find and they expressed their frustration place called -01dgate Nick - (NGF1995764) 3. Final stage or power information missing. in no uncertain terms. a larger factor in what il lakes to making which was an outcrop of rocks close to the winning group. The success of the contest was reflected edge of the map. This site was over 120015 in 4. Registration as per amended rule 16 not in the results, the winner not finding his Here are my suggestions: height and offered panoramic views across complied with (if necessary) Registration second station until after 1600hrs, but most 1) Two sections: Restricted 25W PEP Derbyshire Peaks. should be made with VHFCC Chairman Output from the transmitter and only one contestants finding both belore the end of Transmitter 'B' G3UHF/P 1950kHZ: OTHR if your equipment falls within the the event at 1630. antenna per band. This station was Mdden in a small copse limits as set out in rule 16. Tea was provided aller the contest at Main section 25W output (yes twenty live close to the Trent and Mersey Canal. The 5. Incorrect stationery used; adjudicator to Yardley Gobion Village Hall where the watts PEP output from the transmitter), and site was 7-5 miles from the start on a supply correct forms with returned log. Northampton Cup and other prizes were multi antenna arrays allowed for each bearing of 25r (NGR780579), and access 6. Multiplier lists missing or in wrong presented to Chris Plummer and Andy band to the woods could be gained by using the format in County/Country multiplier events 2) Three sections: The first two the same Collett who then told how they had struggled canal towpath. Approximately. 400 metres through the afternoon. as above, the third section allowed to use of wire was used as an aerial on this site, 7. Logs with missing contact information. Thanks are due to Mrs Sue Lineham and 400W PEP. or DTI limit (4m & 6m). and with a tie thrown across a deep stream into eg no limes or no location. multi antenna arrays. For those who have a her band of helpers for the tea and of other undergrowth on its opposite bank, 8. Computer generated logs not complying course to Eric Young and Steve Stanton for power complex this caused several competitors to cross with standard formats, eg too many OS05 organising this contest 3) Do away with 13cm! the stream unnecessarily in their search for per page or columns transposed The full results are as follows' 4) Do away with 6m1 the transmitter site. 9. Grossly inaccurate scoring (where Ihis is Contests are for you the entrant. I would Time In at The event was won by Mr Trevor Gage of Name Club Second Station not viewed as a deliberate attempt to inflate like to know your views. whether controver- Mid Thames Radio Direction Finding Club, 1 C Plummer SMRC 16-07 the score). sial or not, tor instance why radial rings who found his second hidden station at 2 A Caren ChelmSIDfd 16,07. 10. Missing summary sheets in multiband. rather than kilometres. If you have views 15-34BST. Trevor went to Transmitter 'B' 313 Bristow Mid Thames 15.29 cumulative and AFS events. regarding VHF Field Day this is your first and then to Transmitter 'A'. 3 P Cunningham Chelmsford 16-08 11. Entries sent to the wrong address. 5 A Simmonds Mid Thames 15-24 chance to air them. If the response is wide Second place was gained by Mr Geoff 12. Missing declarations of club membership enough twill try to answer your questions. 6 W Pechey Mid Thames 15.34 Foster who located his second Transmitter 7 P lysle Mid Thames 15.38 in AFS events. possibly make changes, and review the (B) at 15•35BST. 8 D Newman Slade 15-34 whole Subject on the pages of RadCom. All competitors located both hidden sta- 9 I Bulson Chelmsford 15.39 Entries to be treated as check logs Bryn Llewellyn. G40EZ OTHR tions with the exception of Mr R Brewer 10 K Chan SMAR 16.13 1. Entries not eligible for any section in the who due to technical hitches was unable to '01 Gaon Mid 'Thames 15.38 event (eg /P in fixed events). Entrant to be i2 G Nichols Banbury 16-14 locale either station. advised first. 13 G Whenham Coventry 1616 The following is a list of competitors in 2. Entries to VHF NFD from groups or Id D Holland SMAR 16.24 Order of Merit individuals that have not registered their 15 G Foster Mid Thames RESULTS Time In el site. 6G Metcalfe Mid Thames 15.35 Name Club 17 A williams Braintree 15.36 IT Gage Mid Thames Second Ste 514 n Entries to be disqualified automatically 18 C Wells SMAP 2 G Foster Mid Thames 5.35 ig Old not find either station 1. Entries from non RSGB members. NATIONAL FIELD DAY 30 Newman Northampton 5.51 Chris Plummer (G8APB) and Brian Bristow 2. Entry where power declared exceeds RESULTS C Plummer South Manchester 5.55 contest limit. Please note that the National Field Day 50 Holland South Manchester 556 :G4KBB)qualify to compete in the National 3. Entries where Power Capability of equip- results will appear in the November issue of 6 I Morrison South Manchester 5.56 ment exceeds that laid down in Rule 16 RadCorn 7 G Whenham 557 BW Pechey l d Thames Coventry 5S9 (general rules, amendment), and equipment 9 P Lyle M,c1 Thames 6-03 is not registered. 144 MHz AND SWL 10 A Collett Chelmsford 6-06 4. Entries where antenna declared exceeds ir B Bristow Mid Thames 6-09 70MHZ CW CONTEST contest limit. CONTEST MAY 1989 12 G Nicholls Banbury 6.10 DECEMBER 1988 5. ENTRIES POSTMARKED AFTER THE This contest was blessed with excellent 13 M Mallinson Banbury 6-22 14 K Chan Mid Thames 6.30 DEADLINE, or as agreed by the adjudicator conditions into most of the UK. only parts We apologise for the delay in publishing 15 R Brewer South Manchester (under exceptional circumstances, eg postal of GM, GD and GU finding the going rough these results - we hope this hasn't given strike, proven illness etc) The band was wide open into DL, Y. OK and Geoff Foster and Derrick Newman qualify contestants too many sleepless nights! OZ for many hours on both days with one for the 1989 National Final. Tea was served Propagation conditions still confound on Disqualifications to be discussed and agreed report of an HA having been heard. Several al the Coach and Horse Inn where the Cup this band. The previous day's high pressure in committee contestants commented on the lack of was presented to the Winner, Mr Trevor and line weather did not provide stations 1. On grounds of poor signal complaints. splatter on the band, perhaps as a result of Gage. Speeches were given by Trevor with the results and activity expected. OSB 2. On grounds of gross errors, deliberate a more responsible attitude from contestants Gage and Geoff Foster giving reasons lor and noise created problems. Leading station cheating, overscoring of contact points. or maybe a lack of activity from within the their success contact rates were compatible with the 3. Following station inspection, where reas- UK. previous two years, the majority of stations onable cause is found. There were some objections to the fact being regular contestants. 4. On grounds of non-observance of band that the contest coincided with a Bank RSGB HF-DF GMOFRT gave five stations their best DX. plans or code of practice. but only managed six contacts. Holiday, and there were also comments QUALIFYING EVENT - Notes from outlying parts regarding the scoring We apologise to casual contestants it Please use the correct forms: these can be system and its supposed bias to the South NORTHA MPTON they missed the contest owing lo an error in obtained from the RSGB, or from VHFCC East (I'm sure I can remember contests 25th June 1989 dates published in RadCom. This was Chairman G4DEZ OTHR - Please enclose being won from GI back in medieval times - Nineteen teams assembled in bright sunlight beyond the control of the committee. large SAE. G4DEZ) on Me picturesque banks of the Pitsford Congratulations and certificates to both Please in future enclose an SAE with Congratulations to all the winners and Reservoir some ten miles north of Nor- the winner El9FK/P and the runner-up, your contest entry so that confirmation of runners-up, and thanks to everyone else thampton, at 1300hrs. G4RFR. 0811H1

RADIO COM MUNICATION October 1989 79 CONTEST MEWS

MAY 432MHz - 24GHz CONTEST RESULTS 5760MHz SINGLE OPERATOR FIXED SECTION Pos CallsIgn Pis OSO LOC P(mW) G6DER Nil Nil 93GN 150

432MHz SINGLE OPERATOR -IXED SECTION

Pos Calfskin Pis OSO LOC P(W) Best DX KM 5760MHz ALL OTHER SECTION l' G6DER 372 40 93681 60 DFIJM/P 628 Pos Callsign Pis OSO LOC P(mVit Best DX 2 G1KDF 308 50 838181 103 F6KSX/P 932 G4EZP/P 328 1 010E 30 PA2HJS 3 G4PMK 123 20 9361 70 DJ3IW/P 744 4 G8ZOB 111 25 92.09 30 PEOMAR/P 368 5 G4BWP 109 13 02FH 25 PA3BAS 355 6 G6MXL 82 9 80XR 30 PAOGUS/P 579 ICIGHz ALL OTHER SECTION 7 641113 63 13 92KJ 30 PEOMAR/P 360 Pos CallsIgn Pis OSO LOC P(mW) Best DX KM 1' GWOETU/P 1716 11 82JG 250 G3JMEI/P 266 2 G4EZPrP 379 3 010E 250 PADEZ 288 3 GODJA/P 215 3 920B 10 GWOETUiP 103 432MHz ALL OTHER SECTION 4 GOAOU/P It I 93EH 1$ GIHWJ/P 11 Pos CaIbIgn Pis OSO LOC P(W) Best DX KM It G4GCAII/P 4970 337 9411J 400 HB9STY/P 979 ✓ G4HRY/P 4758 326 9321-1 400 DL6NAL 905 3 G4JKN/P 3517 261 81CC 400 DH3NAN 1056 24GH1 ALLOTHER SECTION 4 G8PUB/12 3406 322 010E 350 FIEIT/P 865 Pos Gideon Plu OSO LOC P(mW) Best DX 5 G8TFI/P 3192 264 01KK 400 DK2GR 724 I" G4EZP/P 19 1 010E 7 G6IDUrP 6 GW8KOW/P 2647 284 82JG 41)0 HB9STY/P 926 7 G4VIX/P 2399 214 OIPU 300 0131AB 659 8 GOFRRIP 2097 210 80UU 300 FIEIT/P 930 9 G4BVY/P 1927 194 8110 400 012NO 808 10 G3FVA/P 1094 151 93EH 150 F6KSX/P 875 POSITION ACHEIVED ON EACH BAND 11 G6CSY/P 103$ 135 91XG 403 012810 635 Pas Callsign 432MHz 1296MHz 2320MH: 3456MHz Tole. Pb 12 G1WPFils 747 122 9ISW 50 HB9STY/P 762 GODER 1 4000 13 GW8CMU/P 486 55 8111K IDO DJ3IW/P 765 2 G8ZOB 4 3 2 - 1719 14 G8VER/P 442 91 91SR 10 HB9STY/P 744 3 G8CHw 2 3 2 3542 4 G1KOF 2 5 5 1495 5 G4PMK 3 4 5 3 1250 6 64181 7 6 4 782 1296MHz SINGLE OPERATOR FIXED SECTION 7 G6MXL 6 7 337 Pos CaHaigh Pt s OSO LOC P M Best DX KM 8 G4BWP 5 293 I 6613011 leg 29 93681 103 PAOVVH 532 2 G8CHW 160 32 91TO 100 PAOPLY 376 3 G8208 131 25 92JN 50 PA0E2 437 OVERALL POSITIONS - ALL OTHER SECTION 4 G4PMK 127 19 9361 60 PEOMAR/P 426 POSITIONS ACHIEVED ON EACH BAND 5 611(DF 94 20 838181 45 GOFRE/P 346 6 G4LRT 67 10 921(J 15 F6KSX/P 763 Total Pos Group 432 7 GOMM. 21 8 80XR 2 GW81FT/P 192 1296 2320 3456 5760 10GHz 24G14z Pointa I' Hadrabs ó Tarts CG 4 2 2 2 r The Northern Lights 1 3 Wullrun CG 6 5 4 2 - 2584 4 Sheppey CG 5 1296MHz ALL OTHER SECTION 3 3 - 1939 5 Three Spires CG 2 6 - 1447 Pos Consign Pis OSO LOG PM) But DX KM 4 6 1' G4XUM/P 1463 97 9411.1 200 F6KSX/P 972 6 Exmoor RC 3 - 1417 7 Flight Refueling ARS 8 2' GOALE/P 1319 110 010E 400 F1EIT/P 886 7 - 71 3 GOFRE/P 1109 110 OIKK 400 DKOHT/P 591 8 The Windbreaker's 7 - 4431 9 S Manchester RC 10 8 4 G4HGU/P 807 61 81CC 200 DJ5AR/A 995 - 456 10 Sheppey West Oicast 9 5 GW8IFT/P 516 60 82JG 100 F6KSX/P 815 - 388 II Inh Hour CO II 6 G4IEV/P 477 47 93XN 35 F6KSX/P 849 - 291 12 Wultrun CGS' 12 7 G6SFR/P 400 36 80UU 80 F6KNB/P 878 150 13 GW8CMU/P 13 to- 8 G3UHF/P 314 40 93EH 70 F68ZI/P 766 99 9 G6CSY/P 121 25 91XG 10 GI4OPH 515 10 GW8CMU/P 2 3 81HK 4 G6SFR/P 100

not too far to walk. HF DF QUALIFYING 011eck Log received from G32D/d/p It was a very hot day and summer traffic ROUND, SALISBURY added to the hazard getting over to the 'B' 1989 station G3ZNH/P, hidden in ferns and 2320MHz SINGLE OPERATOR FIXED SECTION 16 teams assembled on Sunday 16 July for bracken (plus decoy aerials), was near Pos Consign Pts OSO LOC P(W) Best DX KM the Salisbury RSGB DF Qualifying Event. Fritham towards the north east corner of ✓ 660611 1600 12 93681 20 PEOMAR/P 414 The starling point was a beauty spot at the Bournemouth map. 1108 2 G8ZOB 8 92,181 4 G4DDK/P 234 Verely Hill. high up and overlooking the The excellent tea was organized by 3 G8CHw 781 7 9110 0.5 GWOK2P/P 204 New Forest. Good signals were received Margaret (XVI of John. G3ZNH) at the 4 G4LRT 386 3 9213,1 8 GOEMG/P 225 from both stations. Activity Centre, Salisbury. Out-stations were 5 G1KL1F 232 4 838181 0.7 GWOK213./P 145 operated by members of the Salisbury 5 G4PMK 232 4 93GT 4 GOEMG/P 88 The 'A' station did appear to be further from the lea site and most (as expected) Radio and Electronics Society and the headed lor it first. Perhaps here the problem event was managed by our chairman Sir 2320MHz ALL OTHER SECTION was finding the easy approach to West Evan Nepean. GSYN. We do appreciate the Pos Gaston Pts OSO LOC NW) Best DX KM Moors Plantation from the main A31. G3TRY/ great support given by so many from ✓ GOEMG/P 11134 32 94RJ 100 PA2HJS 589 P was hidden in thicket and deeply furrowed around the country. G2FIX 2 G4JAR/P 9075 36 010E 55 DLOHC/P 493 3 G4ZAP/P 6001 26 MICK 40 PA301J 402 ground. If the right gate was found it was 4 GWOKZP/P 3907 17 82JG 25 PEOMAR/P 501 5 G4DSF/P 1821 11 9301-1 2 PAOEZ 372 6 G4ITIVJ/P 1752 7 81CC 100 F6KNB/P 926 SALISBURY DF RESULTS 7 G4RFR/P 181 1 8OULI GJ4TAW/P 181 Pose Name Club A 8 G4JLG/13 172 47 G8ZOB 87 3 93EH I P. Clark Torbay 1418 1507 2 B. Bristow Mid Thames 1445 1528 3 C. Wells Sochi Manchester 1448 1545 3rideMHz SINGLE OPERATOR FIXED SECTION 4 r Gage Mid Thames 1450 1545Y, Pos Consign Pts OSO LOC egw) Best DX KM 5 A. Simmons Mid Thames 1558t., 1441 l• G6DER 403 3 93681 06 GOBYV 188 6 A. Called Chelmsford 1446 2 G8CHW 66 0.5 9110 G4EZP/P 133 7 G Whenham Coventry 1519t; 1610 3 G4PMK 27 3 93GT 08 G6DER 27 8 G. Nicholls Banbury 1500 1611 9 M. Mailinson Banbury 1459 1611 10 D. Newman Northampton 1503 1612 11 O Merry Dartford Heath 1535'. 1623 12 M Standen Mid Thames 1529 1629 13 S. Holly Salisbury 1442 3456MHz ALL OTHER SECTION 14 R. Goodearl Mid Thames 1449 Pos Consign Pis OSO LOC NW) Best DX KM 15 N. Underwood Salisbury 1506 G4EZP/P 2871 10.5 010E 6 DF1E0 401 16 K Chan South Manchester 1524 2 GW8GDZJP 995 5 82JG 21 G4EZP/P 338 P. Clark and C. Wells qualify for the national final m September 1989

RADIO COMMUNICATION October 1989 CONTEST NE WS

alive events such as these are won and lost LF CUMULATIVES by operating standards and accuracy of 1989 RESULTS logging, rather than by the equipment RESULTS - 3.5MHz Well Done! 96 entries received, which is an used. The bulk of the scores were very Pain CaIlsIgn 7/1 15/1 21/1 29/1 4/2 Total increase of 21 over last year. Thanks go to close on all bands, and very careful checking 1 'G3LET 210 248 199 656 all who contributed to the 362 logs received, was required to produce a result. 2 G3OLB 192 186 - 221 ck 599 and a special thank you to those who sent Of the 1105 points lost by entrants. 594 3 0440K 213 201 181 ck ck 595 numbered callsign lists and 'Dupe Sheets - were due to unmarked duplicate contacts. 4 G4ASR 218 196 180 ch ck 594 one is always afraid that the extra paperwork 375 due lo misreading of callsigns. and the 5 GUM 177 194 ck 216 ck 587 involved may frighten off some would-be remainder due to errors in copying reports. 6 G3TBK 204 216 132 552 7 G3GLL ck 177 164 204 ch 545 entrants, but checksheets really are a great Many unnecessary points are lost as a 8 G4BOU 201 174 163 ck ch 538 help. result of transcription errors, mistaking 'D' 9 GODJF ck 174 176 183 ck 533 The result on 7MHz was an outright win tor '0"U' for 'V' etc. Get someone who does 10 040G13 189 174 162 525 by G3JJG who used a 253" antenna, not know about Amateur Radio to read 11 G4KGG 178 168 177 - 523 centre-fed with open-wire feeders to achieve back to you the list ol callsigns from the log. 12 041213 183 182 Ch 156 ck 521 a margin 0151 points over the tied runners- II they misread what you have written, so 13 G3YAJ 189 159 164 512 • ck 161 216 125 502 up. No less than 11 entries on this band may the adjudicator! 14 GOCKP 15 G3MCX 164 171 ck 150 ck 485 (including the four leaders) were completely The primary object of the LF Cumulatives 16 G2HLU 162 - 156 161 CI( 419 error-free. On 3.5MHz, G3LET triumphed is lhal of practice and training. Accordingly. 17 04HT0 ck 165 174 137 476 with the even greater margin of 57 points, the HFCC will be happy to provide details 18 G4EC1 159 177 132 468 and on 1.8MHz the laurels went to G4HTD. of lost points and to offer advice_ Write to 19 GM3UM 150 153 Ck 147 ck 450 Both these stations retained almost all their the adjudicator's address shown in RadCom, 19 04013K 162 135 153 450 claimed scores. The three-band certificate or visit the HFCC stand at the I-IF convention. 21 GO1VZ 128 137 177 ck 442 GOCLP 133 138 160 Ck Cis 431 goes to GODJF by the narrowest possible We look forward to seeing you next lime. If 22 23 G3AWR 144 146 ch 138 ck 426 margin (1 point!). and the old-timers award the number of entries continues to increase. 24 G3SWH 225 198 423 to G2HLU, who achieved an overall score there won't be room for adjudicator's grum- 25 G3COR - 145 232 105 362 of 1207 points. bles in the report. G3MCX 26 GOIDE 13$ 123 119 ck ck 377 The highest claimed scores for 1.8 and 27 G4HZF 122 120 127 369 3.5MHz, as well as the highest three-band 28 GW3SB Ch 135 117 114 - 366 total, were submitted by G3TBK. Regrettably 29 03LIK 189 156 345 RESULTS - 30 GM45113 167 177 - 344 he also had the highest number of unmarked THREE-BAND CERTIFICATE 31 G3BPM 62 148 214 ck ck 324 duplicate contacts. This is definitely not a 32 0410m 99 123 ck 90 312 winning combination, and in fact led to the 33 G4JSN ck 108 104 ck 88 300 exclusion of his entry from the three-band Posh Callsign Points 34 GOuiD 129 74 86 289 t 'GODJF 1394 listings. 35 G4Aun 87 108 93 288 2 G4AR1 1393 36 naw2v 108 - 141 249 There were no complaints of lack of 3 G4HTD 1349 37 0014014 62 87 95 244 activity. Most entrants found more than 4 G40013 1343 38 G3ZGC(M 54 54 enough to keep them busy, particularly on 5 0301B 1342 3.5MHz where up to 90 OSOs were made in 6 G4BOU 1282 Checklog received will thanks - G3BCC one session. Many European stations were 7 'G2HLU 1207 worked on all three bands, and there is 8 G3LET 1183 9 G3MCX 1169 always the unexpected - G3LET managed 10 GM3UM 1110 a OSO with VS6 on 3.5MHz. In addition, 11 G3AWR 1078 one session each on 3.5 and 7MHz coincided 12 G3SWH 1064 with a French contest, which added to the 13 GM4SID 1043 RESULTS - 1.8MHz fun (and confusion). 14 G3L1K 1037 Callsign 9/1 17/1 25/1 2/2 10/2 Total Operators used the usual spread of 15 G3BPM 1634 Posn 16 GO1DE 985 1 'G4HTD 129 135 156 ck 420 commercial equipment, and nearly all 17 04HIF 947 2 G3TBK 155 129 134 418 entrants employed some form of dipole 18 G3ZGC 789 3 03016 153 120 93 366 antenna, often extended or strapped for the 19 G4WZV 728 4 G3ZGC/P 123 120 ck 120 ck 363 lower frequency bands. The few exceptions 29 04.15N 712 5 GODJF 114 ck ck 126 120 360 used long-wire or inverted-L (Marconi) 6 G40GB 147 102 105 354 antennas. It is evident, however, that cumul - ' - Certificate Winner 7 03611 122 120 ck Ch 108 350 8 G3BPM 120 111 ck ck 117 348 9 G4ENA 126 111 99 336 10 031E1 47 90 153 290 10 G4ARI ck 90 ck 99 101 290 RESULTS - 7MHz 12 G3MCX 102 ch ck 93 93 288 13 G4DJK 84 89 114 287 Posn Consign 8/1 14/1 22/1 28/1 5/2 Total 14 03114 ch 84 ck 88 105 277 1 '63JJG ck 177 189 201 567 15 G2HLU 99 95 ck 81 ck 275 2 G3SWH 162 162 - 192 - 516 16 G4BOU 93 63 117 273 2 G4AR1 ck 174 180 162 516 17 GM3U 78 90 ck ck 87 255 G3AWR 4 GODJF CI; 156 165 180 ch 501 18 90 78 ck 81 ch 249 5 G4KGK t41 180 168 - 489 19 GM4S1D 135 108 243 6 GOCKP Ch 153 179 147 479 20 GOIDE 81 ck ck 79 73 233 G4WZV 7 G4BOU '50 159 ck 162 471 21 95 107 202 182 G40GB 158 148 158 ck 464 22 G4JSN 60 53 ck ck 69 9 GM4S1D 174 147 135 • 456 23 G4HZF 87 51 39 168 G3SWH 125 10 G2HLU t 56 156 141 ch 453 24 125 G4E601 63 10 G4HTD ck 147 162 144 453 25 63 12 64120 132 159 ch 142 433 Check log tecewed with thanks G3BCC 13 GOIVZ 131 146 ch 150 427 14 G4XPE 129 ck 153 ch 144 426 15 GW3SB 135 I40 149 ch- 424 16 G4I0M Ch 153 120 144 417 17 G3LIK 126 129 160 415 18 G4HZF 141 134 ck tas 410 CONTEST LOG SHEETS 19 GM3UM 138 Ch 144 ck 123 405 20 G3AWR ck 117 138 146 ck 401 Readers are reminded that both HF and VHF 21 G3MCX 132 ck 144 120 396 22 G3OLB 96 180 101 377 logsheets are available from Headquarters in 23 GOIDE 117 ck 141 ck 117 375 24 GM3VEY 126 127 120 373 packs of 100. Prices (which include postage 25 G3ZGC ck 141 108 123 372 and packing) are £3.29 for RSGB members 2$ G4WZV 123 130 119 ck 372 27 GOBIO ck 120 122 123 365 and £.87 for non-members. When ordering 28 G3BPM 123 111 ck 98 332 29 G3TBK 116 177 293 please remember to specify which type of log 30 G3COR 129 39 119 287 sheet is required. Send your orders to: 31 G3LET 90 237 32 G4JSN 62 72 96 230 RSBG Sales (CWO) 33 GW4KVJ 90 87 17/ Lambda House, Cranbourne Road, Potters Bar, Herts EN6 3JE.

RADIO COMMUNICATION October 1989 81 CONTEST NEWS

the majority for the first few hours of the 1296MHz and 2320MHz Trophy section on CONTESTS CALENDAR 432MHz TROPHY RESULTS Sunday morning, but died once the sun warmed up. SINGLE OPERATOR FIXED SECTION The resulting quandary over whether to RSGB HF CONTESTS Pos Cathie Pis OSO LOC P(W) BestDX KM work the DX before it fades away or to wait 8 Ocl 21128MHz Phone (Aug89) 1 ' G6T 01 502 r 01F1 50 0.19RX 610 9 Oct 28MHz Cumulative fAu9891 2 GIABI 298 61 92MC 400 FC1GKE 447 until the contest starts possibly explains 3 0100F 246 .10 83NN 100 PEOMARiP 582 why more stations than expected chose to 15 Oct 21MHz CW (Jul891 17 Oct 28MHz Cumulative 4 GIHLT 207 36 9300 30 PACEZ 439 ignore the 1296MHz and 2320MHz Trophy 25 Oct 28MHz Cumulative 5 G6MX4 30 5 8,3X9 30 G4GCM.P sections and operated in the 24 hour 28 Oct Mollart Memorial Trophy HF OF section. Event (Oct89) Unfortunately. few groups took equipment ALL OTHER SECTION 2 Nov 28MHz Cumulative for the higher bands, possibly as a result of Pos CallsIgn Pis OSO LOC PM) Bes1DX KM 10 Nov 28M)-fz Cumulative trying to concentrate resources for a good IIT) GE1TFLP 3192 264 01KK 400 00209 724 11 Nov Club Calls Contest 'CCC. !ad) all 2 G4GCM,P 2562 201 9413J 400 13013AK 776 result in the Trophy sections. Activity modes & SWL (Sep89) 3 G4MRSW 2318 206 0100 200 FF6KKN,P 685 suffered as a result. Despite this it is 18,19 Nov Second 1-8 MHz CW (Sep89) 4 G8PUB/P 2269 200 010E 350 DK2GR 700 encouraging to see an increase in the 5 GIBVY/P 1927 194 8110 400 DL2NO 808 number of contacts made on 1 OGHz and 1990 6 G3CKR ,P 1881 204 93AD 400 OD5TDIA 817 also that VAilfrun tried, albeit unsuccessfully. 24 Feb, 1990 7MHz CW Contest lAug89) 7 G4VIX/P 1799 161 01PU 300 DLIZC ,P 629 14 Jan. 1990 AFS Team Contest (Oct89) 8 G4HRY/P 1462 146 93XE1 400 DG5ZI/P 693 on 24GHz. G6DER had a system working 9 GWEIKOW/P 1323 164 82JG 400 DL2KBB 665 on 5.7GHz even though he didn't hear 10 GEIZHP t 276 139 92T9 400 DJ9KH 626 anything all weekend' 11 G6CSWP 1035 135 91X0 400 01.2NO 635 There were the now statutory complaints RSGB VHF CONTESTS 12 GOFRR/P 827 112 80UU 300 DK3FB 694 about the East Coast stations not beaming 7,8 Oct 432MHz-24GHzilARU UHF/SHF 13 GWODVV/P 599 88 8.3JA 40 PEOM ARA,' 509 inland enough. but as G8TFI commented 13 Oct 432MHz Cumulative (0c189) 14 G3FV/VP 485 88 93611 150 0004044 721 the points per contact drops whenever they 21 Oct 13/23GHz Cumulative (0c169) 15 G4LOO/P 467 102 919U 150 OKOJJ 535 29 Oct 432MHz Cumulative (0c189) 16 G1WPFJP 321 69 91SW 50 DJ3IWiP 586 beam away from the continent and while 17 G4BZPIP 305 49 &LIG 50 04109/P 424 there is more activity there than in the UK 4,5 Nov 144MHz CW 6 Nov 13/23GHz Cumulative Oc189) 18 GW8CMU/P 227 32 81HIE 100 PEOMAR/14 520 what is the incentive? Any suggestions? 19 GOCPE 224 49 91PF 90 G4GCNLP 353 Last year the idea of arranging the 10GHz 14 NOR 432MHz Cumulative (Oct89) 20 GJ4TAW/P 153 14 89WF 60 G4GCMIP 584 22 Nov 13/23GHz Cumulative (0c189) Cumulatives to coincide with this contest 21 G6HLUP 118 27 83PF 10 G8PUB,P 358 30 Nov 432MHz Cumulalive (0c189) was mooted. but very little feedback on this 22 G6W0G/P 78 29 84VB 45 G8TFI/P 356 3 Dec 144MHz Fixed & AFS & SWL p0inl was received. Does this mean that it is 8 Dec 13123GHz Cumulative (0c189) SWL logs gratelully acknowledged from BAS 52543 and BPS 31976 not wanted? Your comments, please. as it is 9 Dec 50MHz CW Conlest (Oct89) difficult to know what is wanted unless you 10 Dec 70MHz CW Conlest (Oct89) tell us. Oh, and while you are writing, would it be 1296MHz TROPHY RESULTS better to put the 1296/2320 MHz Trophies OTHER CONTESTS on . SINGLE OPERATOR FIXED SECTION 11 Nov Australian Ladle Amateur Radio (a) the beginning of the October UHF Pos Callslgn Pis OSO LOC P(W) BestOX KM Association Contest (A489) y G8CHW 160 32 RITO 100 PAOPLY 376 contest? 13 Jan, 1990 DOLO Mid-Winter Contest 2 04000 139 22 93014 10 G3SHK 236 b) the first weekend of June which woulo (Aug89) 3 G1KDF 94 19 831414 45 GOFRE/P 346 coincide with the continental contest but 4 G4LRT 65 8 920,1 15 F6KSX/P 763 clash with HF NFD? 5 G6MXL 14 5 80XP 2 GW8IFT/P 192 or c) a totally separate weekend without First Tuesday each the benelit of any co-ordinated continental month 144MHz Scandinavian VHF/UHF/SHF Activity Contest ALL OTHER SECTION activity? (Jan89 VHF/UHF) Pos CallsIgn Pts OSO b C P(W) BesIDX KM In the Overall event G6DER and Hadrabs (Ti G4XUEA,P 1463 97 949,1 200 i6KSIP 972 and Tarts CO won their respective Single First Thursday each month 432MHz Scandinavian 2 • GOFREP 1109 110 011« 400 DKOHPP 591 Operator and All Other Sections once VHF/UHF/SHF Activit y Contest 3 GW4HWAJP 1065 88 SILT 400 F6KNE'P 993 again — well done. (Jan89 VHF/UHF) 4 G/IMRS/P 697 90 0100 150 DLOZP 613 The 432MHz Trophy (1951 Council Cup) 5 G6SFR/P 400 36 80UU 86 F6KNI3iP 878 First Monday each 6 G4SIV 397 43 9219 150 DA1UM:P 572 winners were G8TFliP the Sheppey CG. month Microwave Scandinavian 7 G3UHF/P 314 40 93EH 70 061321,P 766 The 1.3GHz Trophy (VHF Contest Committee VHF/UHF/SHF Activity Contest 8 G4LOO/P 272 44 91131.1 30 F6KNIIP 982 Cup) and the 2 3GHz Trophy (G6ZR Trophy) (Jan89 VHF/UHF) 9 GJ4TAW/P 131 15 119VdF 15 G3KFO 361 were won by The Northern Lights. G4XUM/ tO G6CSY/P 121 25 91X0 10 GI4OPH 515 P and GOEMG/P respectively Oates of publication of rules in I 1 G61NVG,'P 63 9 84VB 1 3 GOF REA:, 356 Thanks once again to all the participants RadCom are shown in in this event and congratulations to the parentheses above mentioned and all the certificate 2320MHz TROPHY RESULTS winners. G4M9S SINGLE OPERATOR FIXED SECTION Pos CallsIgn Pis OSO LOC P(W) Bes1DX KM 1 ' 04000 841 7 93014 G4JAR P 296 2 G8CHW 781 7 91TO 0 5 GWOKZPP 204 1988 432 MHz CUMULATIVE CONTEST 3 G4LFIT 367 2 920.7 8 GOEMG/P 225 4 G1KDF 232 4 831414 0.7 GWOKZP/P 145 All Others Pos Call Score Inc Best DX 6/10 22/10 7/11 23/11 9/12 1 GW4NGRIP 3000 83JA 532 371 938 707 515 407 ALL OTHER SECTION 2 0451V 2465 92TR 544 269 — 582 364 465 Pis OSO LOC Bes1DX KM Pos CallsIgn 3 GO61CR/P 2040 74PD 456 237 38 — — 492 1)1) GOEMG/P 11134 32 949J 100 PA2HJS 589 4 G3F1SD;P 1720 93VJ — 96 215 447 277 271 2 04000/P 6034 010X 12 049V,I ,P 370 40 PA301J 402 5 GBOOHM 023 92AJ 535 — 234 242 171 148 3 G4ZAP.P 6001 76 010 6 G8Y25 ,A 365 9190 — 49 67 — 43 4 0,14TAW/P 1191 5 89WF 2.5 G3KFD 361 5 G4RFII‘P 181 1 80UU GJ4TAW/P 181 Fined Pos Call Score Loe Best DX 6/10 22/10 7/11 23/11 1/12 i G8HHI 3000 910H 551 178 470 587 — 297 2 G81AT 2601 91TV 526 135 441 376 203 187 432 MHz, 1.3 GHz, on a different weekend. 3 G8HKM 2371 SIFT 468 — — 474 134 260 2.3 GHz TROPHY It was hoped that the separate Trophy G4 P10 2355 DIMM 429 — 360 491 179 — sections would help boost activity and 5 G4NPH 2128 0281 398 150 — 386 197 184 CONTEST RESULTS possibly help the smaller groups who are 6 G8CSY 1833 W e) 446 61 306 160 — 57 7 GIKEW 1775 83NN — 96 — 207 155 192 In an effort to reduce the number of unable to man all bands for the lull 24 hours 8 081460 1718 81VK 508 110 144 301 168 135 contests in the calendar the Trophy events to achieve a better overall result. 9 0 IHL T 1134 9300 429 80 154 1676 104 104 were included in this one as an experiment Activity did increase, particularly on the 10 0801W 739 OIHI 453 11 103 161 48 — Opinions were mixed on the success of this lower bands, and was aided by enhanced 11 08.10V 689 910E 289 37 39 it 71 76 formal, the majority of entrants welcoming propagation overnight Those who continued. 12 03,1,12 614 01AJ 310 46 98 115 55 60 the inclusion of the 432MHz Trophy at the operating on 432MHz after the Trophy had 13 G4LOR 514 91CD 422 29 38 141 22 55 start of the contest but most seeming to finished enjoyed good contacts into DL. Check logs gratefully recewed 0213HV, GONDS. GOFKY. GA10F GI NRM E3RS31976, want the 1296MHz and 2320MHz Trophies HO. and F. Conditions remained good for

82 RADIO CO M MUNICATION October 1989 G Ford. G4670. 2 Jersey Avenue. Sr Annes. Bristol. RG7 603 8S4 4RA. Tel 0272-770504. LOCAL AFFILIATED SOCIETIES SOUTH BRISTOL ARC. G4WAW Meets 7.30pm on BO R DE RS Wednesdays at Whitchurch Folk House, East Duey Council Zone: G AND CLUBS Road, Bristol Deist Iront Mr L F Baker. G4RZY, 62 RLO: Ian Wilson. GlIA4UPX, 30 Court Farm Road. Whichurch Bristol BSI4 OEG Howdenburn Court, Jedburgh, Roxburgh Tel 0272434282. TD8 6.1P. Tel: 0835-62556. The following list shows all local societies and clubs who are currently THORN8URY S DARC G4ABC Meets on alternate GALASHIELS & DARC, GM4YE0 Meets 7 30pm on affiliated to the RSGB. The details of where the club meets, contact person Wednesdays al 7 30pen, Limed Reform Church Hal. Wednesdays. al Focus Centre, Galashiets Details etc were the best available at the time of going to press. If you have any Rock Street, Thornbury. Bristol Details from Mr JA Iront Mr John Campbell, GMOAMB. 9 Brunton Park. Jones. GRA7T. 9 Queens Walk, Thornoury, Bristol. Bowden. Melrose corrections or additions to this list, please give them to your RSGB Regional BS12 'SR Tel: 0454,416381 KELSO ARS. GMOKELGM4KHS Meets 7 30pen on Liaison Officer (RLO) whose details are shown at the start of every county. WESTON-SUPER-MARE ARS. cawsm. Meets Mondays, at Abbey Centre. Kelso, Roxburghshire Each club is listed under tne administrative county or Scottish region in which 7.30pm on tat and 3rd Mondays in the month. at The Details Iront Mr Ian H Wilson GM4UPX 30 it regularly meets. For example the clubs which meet in Bromley whose Woodspring Hotel Hen Street. Weston-super-Mare. Howdenburn Court, Jedburgh.Roxburghshire TDB Avon Details from Mr J H Wills, GOKEIT. 17 Moor 6JP Tel: 089862656 postal county is Kent can be found in the Greater London section, likewise Lane, Mow Grange. New Bristol Rd. Worm, the Todmorden club is listed under West Yorkshire despite having a Weston-super-Mare. Avon. BS22 OSJ Tel 0934. BU C KIN G H A MS HIRE Lancashire address. Some affiliated societies, eg contest groups, do not hold 514429 Council Zone: D RLO: Ron Ray, G3NCL, Flat 4 Victoria formal meetings, and details as to where other clubs meet has proved BE DF OR DS HIRE Villas, Gladstone Road, Chesham, Bucks impossible to obtain. These societies have therefore been listed under the Council Zone: 13 HP5 3AD. Tel: 0494-776420 county of their RSGB registered address. FILO: John 5 Smith. G4KJ.J. 30 Rookery APPRENTICE TECH C G4BWD. Details from Close. SI Ives. Cambridgeshire PE17 4FX, Apprentice IC Amateur Radio Club. Civil Awation Each county is assigned to an RSGB Zone and elects a Zonal Council Tel: 0480-68330 Authority STE. Blelchley Park. Milton Keynes MK3 Member. There are 7 Zones (A to G) and their Zonal Council Members are: BEDFORD & DARC. G3WTP. Meets tot and 3rd 6EF. Thursdays in the month. at Alen s Club. (keens AYLESBURY VALE REPEATER GP. GB3VA Meets Zone A: (Northumberland, Tyne & Wear. Co Durham. Cleveland. North, Para, Redford ()emits from Mr C P Lens. 64 VHF. 25 on the 2nd Wednesday in the month at The Bell South & West Yorkshire, North Humberside. Cheshire. Greater Manchester, Red Lion Close. CranheM. Bedford MK43 QM. Tel Harchinck. Aylesbury Details Iront MI Mike Marsden 0234-751763, G880H. Hunters Woon, Buctiognam Road. Merseyside. Lancashire. Isle of Man. ) BEDFORD MODERN SCHOOL. GI BYT (This club is Han:Wick, Aylesbury. Bucks. HP22 4EF. Tel: 0296- Geoff Smith, G4AJJ. "Greenacres", Sawdon, Scarborough, North Yorkshire for school pupils only) Meets at 8edlord Modern 641783. Y013 9DY. Tel: 0723-85845. School. Manton Lane. Bedford, MK41 7141 Details AYLESBURY VALE RS, G4VRS. Meets 8.00pm on 1st Zone B: (South Humberside. Derbyshire, Northampotonshire. Lincolnshire, tram Mr él E Kinselley, and 3rd Wednesdays in the month. al Hanvick Village MID BEDS CONTEST ASSN, G4MBC Deals from Hall. Aylesbury Bucks. Dotais Iront Mr Marlin Baker. Shropshire, Staffordshire, Leicestershire. Cambridgeshire, West Midlands, Mr M J Downs, G4ALR. 95 Hgh Street, Hello*. GOGMB, 25 Pentlands, Hilltop. Stony Sfrailord. Hereford & Worcester. Warwickshire. Northamptonshire, Bedfordshire) Beds. Milton Keynes, MK II 2AF Tel 0908260088. John Allen, G3DOT. 4 Philip Avenue, Waltham, South Humberside DN37 PARALLEL LINES CONTEST GP, 044.114 Details fron, CHESHAM & DARS. G3MDG Meets 8.00pm on Mt M Et Turner. G4PCS. 35 Cavernous° Road Wednesdays at Stabie Loft. The Bury Farro, Pednor 000. Tel: 0472-825899. Luton.1.03 1PY Road. Chesham, Bucks. Dews horn Martin Bird, Zone C: (Norfolk. Suffolk, Essex, Hertfordshire. Essex. Greater London. SHEFFORD d CARS. G3FJE Meets 8 00cm on 01020 18 South Road. Amersham, Bucks, HP6 Surrey. Kent, East & West Sussex) Thursdays. at Church Hall. Silsoe Road. Shelf oid SLU Tel 0494-727589, John Greenwell. G3AEZ. Eastfield. Beare Green. Dorking. Surrey RH4 5RW. Beds. Details from Mr A R Lyle, G4PSO. CHILTERN ARC. G3CAR. COCAR Meets 8.00pm on 2nd and 4th Wednesdays m the month. at Se William Tel: 0306-77236. BER KSHIRE Ramsey School. Rose Avenue. Hazelmere. High Zone D: (Gloucestershire. Ox1ordshire. Buckinghamshire. Avon, Wiltshire, Council Zone: D Wycombe. Bucks Details from Ron Ray. G3NCL. Berkshire, Somerset. Cornwall. Devon, Dorset, Hampshire. Isle of Wight. RLO: Dave Chisletl, G4XDU, Hilltops. 23 St Rat 4 *IOU Vale, Gladstone Road, Chesham, Marks Road, Maidenhead, Berko SL6 ODA. Bucks HP5 3AD. Tel 0494-776420 Channel Islands) Home: 0628-25720, work: 01.977 3252 ext MIDi THAMES DF C. G4MDF Meets al Clayton Arms. Peter Chadwick, G3RZP. -Three Oaks". Braydon, Swindon. Wilts SN5 OAD. 2267/2268. Marlow, Bucks Details trern TfeVOf Gage, at MPJ. Home: 0666-860423. Work: 0793-518080. ABINGDON CONTEST GP, C,4UHF. Details Iron, Mr Lowbeki House, Bolter End Lane. Lane End, High Zone E: (Gwynedd. Clwyd. Dyfed. Powys. West. Mid & South Glamorgan, Alan Davidson. G4PS1.1. 21 Caengorm Road. Wycombe HP14 3148. Tel n494-881842 Thaiham. Newbury. Berks. R613 4FT MILTON KEYNES d OARS. G3HILI Meets 2nd Gwent) ARIEL RADIO GP. G3SWB. Details from 57 St Jorres Monday in the month. at The Meeting Mace. Hodge John Case, GW4H WR, 2 Abbey Close, Tyrhiw Taff s Well. Mid Glamorgan Roan, Caversham. Reaang Lea. North Milton Keynes Details from Tony Burl, CF4 7RS. Tel:0222-810368. BRACKNELL ARC, G48RA, G68RA Meets 8.00pm G6WXM. 17 Western Road. Wohrerlon, Milton on 2nd Wednesday e the month, at Coopers Hill Keynes MKI2 SAY Tel: 0908-316435. Zone F: (Co Londonderry. Co Antrim, Co Tyrone, Co Fermanagh. Co Community Centre. Bracknell. Bents Details from Mr RAF HALTON AR. E & CC. G4SOC. Meets 8.00pm on Armagh, Co Down) Daed Sugden. G4CGS. 322 Nine Mk Ride. Thursdays. al Budding 168. RAF Halton. Aylesbury. Terry Barnes. GI3USS, "White Gables", 95 Crawfordsburn Road, Bangor. Worngham. Berks. RG11 31111,1. Tel: 0734-733140. Bucks. Details Iront Son Ldr Ted Turk, RAF IPIN, Co Down, BT19 1BJ. Tel: 0247-473948. BRITISH AEROSPACE S & SC, GOBAE. Details from Halton. Aylesbury, Bucks. HP22 5PG Tel:0296- Dynamcs Group. Dovmshire Way Bracknell, Berks. 623535 E. 56r Zone G: (Shetland, Orkney, Western Isles, Highland, Grampian, Tayside. R612 10L. Strathclyde, Cewntral, Fife, Lothian. Dumfries & Galloway. Borders) BURNHAM BEECHES RC. G3W1R. G6WIR Meets CA M B RIDGES HIRE Frank Hall, GM8BZX, 45 Priory Cottages. Lunanhead, Forfar, Angus DDB 8.00pm on 1st and 31ci Mondays in the month at Council Zone . G Haymill Youth & Communrhy Cen. 112 Burnham RLO: See under Bedlordshlre 3NR. Tel: 0307-67565. Lane. Slough. SLt ELK. Details from Eileen Chistett. CAMBRIDGE & DARC. G2XV, G8EVY. Meets 7.30pm G6EIL. 'Hilltops". 2a SI Marks Road. Maidenhead. Fridays during term time, at Visual Ads Room, Berks. 51.660A Tel: 062825720 Coleridge Community College, Radegund Road. MAIDENHEAD & DARC. G3WXX Meets 7 30pm on Cambridge. Details from lb Brian Davy. G4TRO. 12 BRUNEL TECH COU.. G5FS Details Iront Phil AV O N Hi Tuesday and 3rd Thursday in the month, al Red Millington Road. Cambridge. CB3 9HP. Tel: 0223- Beouder. G3ZJH. Dept of Aerospace & Council Zone: D Cross Hal, The Crescent. Maidenhead, Bents 353664 Communication Engineenng. Brunel Technical RLO: Shaun O'Sullivan, GBVPG, 15 Witney Details from Mr Neil Sawn, G8XYN, 7 Bannard Road, CAMBRIDGE UNIV WIRELESS SOC. G6UW Meets College. Ashley Down. Bristol BS? 9BU Close, Sanford, Bristol, BS18 3DX. Tel: Maidenhead, Berks. SL6 4N6 Tel 0628 25952 Society meets only during term time Details Iront GORDAN() ARG, G6GRG. Meets 8.00pm on 4th 0225-873098. NEWBURY & (MRS. G3W0I. Meets 7.30pm on 2nd Calhenne Carr. G6COA. co Selwyn Come, Thursday in the month, at The Ship, Reille Bay. BATH 2. DARC. G4T1AH. Meets 8 00pm on alternate Thursday in the month. Details from Mr Mike Cambndge. Poreshead. Avon Details Iront Mr PT Cooke. Wednesdays in the month. at F_nglishcombe Femday. G3VOW. Spedlewood. Stoney Lane CAMBRIDGESHIRE REPEATER GP. GB3PI Details 66E7L. 42 Sunnyrnede Road. Nalsea, Bristol BS19 Englishcombe Lane, Bath. Details from Mr Eric H Newbury. Berks. RG16 9H0. Tel. 063843048 co New House. Bedbush Avenue, Sefton Walden, 1ES. Tel: 0272855316. Otten, G4GEV. 1 High Street, Wellow, Bath. 8A2 NORTH HAMPSHIRE REPEATER GP. GinAw Essex, HTV RC, G4HTV. Details from HTV. 470 Bath Road. 800. Tel: 0225432156 Details from Mr Alan Wood. Wood & Douglas, Unit GREATER PETERBOROUGH RC. 04EHW Meets Bristol. 1354 3HG BATH UNIVERSITY RC. G7A8U. Delads co 38 13, Youngs Industrial Est. Aldermaston, Reading, 7.30pm on Otri Thursday m he month, at Sou:Miele MENDIP REPEATER GP. 08309, GB3UT. GB3VS, Church Road, Peasedown St John. Bath RO? 4P0. Junior School. Stanground. Peterborough Details GEOVIR. Dees coP O Box 73. Radslock. Bath BRISTOL ARC. G3TAD Meets 7 30pm on Tuesdays. RACAL MOBILCAL & TACTICOM ARG. G3X0X. Iront Mr S Meadows, GlUGA. 134 Medeswell. Orton BA3 3GP. al St Aidens Scout HO. Finree Lane. St George. tOpen to Racal employees only) Details from 464 Malborne. Peterborough Cambs. PE2 OPD Tel: NORTH BRISTOL ARC, G4GCT. Meets 7.00prn oir Bristol, 8.5.5 8TZ. Details Irons Mr O J Guky. G4Y0C. Basingstoke Road, Reading HG? ORY, 0733-2300M. Fridays. at Sell Help Enterprise 7 Braemar Close. 46 Shellards Road. Longwell Green. Bristol. 8315 READING & DARC. G3ULT Meets 8.00pm on the 2nd HUNTINGDONSHIRE ARS, 6011SR. Details co D R Northville. Bristol. Details from Mr A V Booth. 6DU and 4th Thursdays ro the month at Me Caversham Massey. 63 West End Brampton. Huntingdon 641100. 656 Soutrunead Road. Fitton Park. Bristol, BRISTOL RSGB GP. Meets on the last Monday al the Conservahve Club. KO Sr. Gosbrook Road, Lower Combs BS7 80Q Tel: 027690404. month rril the Small Lecture Theatre. Universdy of Vaversham, Reading. Details Irom Mr Mike Anthony. MARCH di ORAS. G3PMH Meets 7 30pm on Bristol. University Walk. Clifton. 8nsiol. Details horn SEVERNSIDE TELEVISION GROUP. GB3ZZ. Details 0411414, 9 Parce Green, Wolurigham, Berks RG11 Tuesdays. at Room 7 Neale Wade Adult Ed Cenfre. Tony Capel, G4ROX. 33 Romney Avenue. Lockleaze. from Shaun O'Sullivan, SEIVPG. 15 Worley Close. 1YN. Tel. 0734-774042. Stabon Road. Mech. Cambs. Derails Iront Mr J Bum B37 951 Tel 0272513573 Sanford. Bristol, 8S18 3DX Tel, 0225-873098 READING SCHOOL ARC. G4RSC Details from Bia ,amaite, G3PWK. 10 Lawn Lane. Little Downhan BRISTOL 432MHz Repealer GP. 08385. GB3BP SHIREHAMPTON ARC. G4AHG. Meets 7.30prn on Reading School, Erlegh Road. Reading, ROI 5LW Ely, Cambs, 006 OIS Details from Mr S J Bailey. G4MCO. 50 Quantock Fridays. at Twyford House. Lower High Street, READING TELEPHONE AREA RC. G4LNV. Details NORTH CAMBRIDGESHIRE RO. GB3WI Details Close, North Common, Warrnley. Bristol. 8315 SUT Shirehampton, Bristol. BS11 ODE Details Irons Mr R from 40 Broad Lane. Upper Buck lebury. Reading. from Mr J P Arnold. G4NPH, 2 Duck Lane,

RADIO CO M MU NICATION OCT OBE R 1989 83 CLU B FILE - 1 111 M il

Haddermarn. Ely, Cambndge.CB62UE Thursday rn the month. al The Studio, Reviles Road. Park, Craigavon, Co Armagh BT65 4A11. BORDER TV LTD ARC. G6EITV, (Open only to empleyeest. Dews from Amateur Radio Club. PYE TELECOMMS ARC, G3PYE Details from Mr D B Colwyn Bay. Clwyd Details hem Mervyn Jones, Tel: 076242620. Delaney, St Andrews Road Cambridge. CBI 401N GW4NNL. 721) Princes Drive. Colwyn Bay. Chvyd. ARMAGH & DUNGANNON ARC. GIOADD. Meets Border TV Ltd. Television Studros, Carlisle. RAF WYTON ARC. G3MIMH Meets at RAF Wyton. 1129. 8PW. Tel:0492-530725. 8.00pm on 2nd Wednesday of the month. at Co BBC SKELTON ARC. G3ZSK. (Open only to BBC Humingdon,Cambs DELYN AC RS91677 Meets 8.00pm on alternate Armagh Golf Club, Newry Road. Armagh. Details employees). Details from BBC Transminog Sleet!, S BUCKS CONTEST GROUP G4NX0 Details Iron Tuesdays. at Daniel Owen Centre, V«, Chirp from JA Murphy. Tel. 0861S22153. Sharron Pastures, Skelton. Pennth, Cumbria Mr A .1 Collen. 10 Quince Road, The Limes. Hanvick Details trots Mr Steve Shiddart, GW7AAV. 33 Linden CARLISLE & OARS. G4ARS. Meets 7.00pm on Mordays. al The Scout HO, Trinity School, Carlisle. Cambridge. C83 7XJ Avenue. Connahs Ouay, Deesnde. Clwyd. CH5 4SN C O DO W N WISBECH R & EC. CANED Meets 7 30pm on Tel:0244-819618. Council Zone: F Deters kern Mr J A Ennis. G3XWA, 30 HilIcrest Thursdays. at RAF Assn Club. Astral House on Old Rif& & DARC. GW4ARC. Meets 7.30pm on I st and HLO: Please see under Co Armagh, or Co Avenue. Carlisle, CAI 20J. Tel: 0228,27463 EDEN VALLEY RS. GOANT. °alerts from Mr M J Market. Wisbech. Cambs Deets from Mr L N 3rd Mondays in the month. at 2nd Rhyl Scour HO, Antrim (Belfast) Fennelow, G4ODH 39 Clarence Road. Wisbech. Vale Road. Rhyl. Clwyd. Deers from Mr Mike Drew. BANGOR & DARC. GOXR0 Meets 8.00pm on tot Rigby. G4FUI, 35 Maple Drive. High Carleton. Camas PE13 2ED GWOHWK, Warden's Flat. Uyslasi, Llysfae Coll of Fnday in ere month, at Bangor Rugby Club. Bangor. Pennth, Cumbria, CA11 8TU. Tel: 0768-66728. Agriculture. Rehm, Clwyd. LL15 2111. Tel 097888 , Co Down Deters from Mr J T Barnes. GI3USS. 95 LAKELAND FELLS MIRO. GB3LF Deans clo Holly C E N T R AL 621 or0978-755822 Crawfordsbum Road Bangor. Co. Down. BT1.3 1BJ. Trees. Church Close, Levens, Kendal. Cumbna Council Zone: G RAF SEALAND ARC. GW4RAF GW8ITZ, Meets most Tel. 0247473948, RAF CARLISLE ARS. G3USO RLO: B J Waddell, GM4X0J, lunchtimes for RAF & Mot) personnel. Details from BELFAST ROYAL ACADEMY RADIO CLUB, SOLWAY RC. 04880 Meets Wednesday evenings. al "Carsemount", 3a Polmont Road, Vince Priamo.*o Radio Club. No 30 MU. RAF GI7DAW Deers co 160 ArdeMee Avenue, Ballast Maryport Ed Settlement High Street, Maryport. Laurieston. Falkirk FK2 900, Sealana. Deeside. Clwyd, CH5 2LS. Tel. 0244- MID-ULSTER ARC, GI3VEW Meets 3.00pm on 2nd Cambia Details from Mr DG Rayner. GOAFP. 55 STIRLING & OARS GM4TMS Meets every Thursday 812331 Est 354. Sunday in the more. ai The Guide Hall, Casita Mayo Park. Cockerrnouth. Cambra. CA13 OBJ Tel. effete at 7 30pm, Bandeath Industrial Estate, WREXHAM ARS. GW4WXM Meets 7 30pm on 1518 Gilled, Co Down Creels Imam Mr J Lawn. GilYGS. 0900-826461. Thresh. he Steling. Details from Mr Doug Fleming. 6 3rd Tuesdays in the month. at 'Friends Meeting 46 Grange Roaa. Kemore. Armagh, Co Armagh. WINDSCALE ARES, G3WIN The Wotan, Ashford. Dunblane. F610 2YL Tel House'. Holt Road, Wrexham Details from Mr Peter 8T61 ONO Tel 0762-851179. WRAY CASTLE ARS. G1WCC Meets at Wray Castle 0786.824207 Higgs. GW4IGF. Outten% Parks/de. Rosser.' Coll of Manne Elc, Ambles*. Curebna Wrexham, Clwyd. LL12 °BP. Tel 0244.570212. C O DU R HA M C H E S HIRE Council Zone: A D E RB YS HIRE Council Zone: A C OR N WALL & ISLES OF SCILLY RLO: Please see under Cleveland Council Zone: B RLO: G R Morris, GW1ATZ, 6 Kent Council Zone: D BISHOP AUCKLAND RAC. G4TTF. Meets Thursday RLO: Post vacant, please refer to Zone B Avenue, Shotton, Deeside, Clwyd CH5 RLO: Bert Ham mett, G3VWK, "RosehIll", evenings. at Travellers Res1Public House. Council Member. 1BE. Tel: 0244418252. Ladock, Truro TR2 4P0, Tel: 0726-682758. Evenwood, Bishop Auckland. Co Durham Deers ALFRETON & DARC. GOCP0, GI PWH Meets CHESTER 8 DARS. 03011. G8GIZ Meets 8 00. 2na CORNISH RAC. G4CRC Meets lot Thursday & 3rd from Mn P Fenced GOFT9K. 7 Albert Hill. Bishop 8.00pm on Mondays. at ECP Social Club, Carnfiard Alhelon, Derbyshire. Details from Mr Phil and 4th Tuesdays tn the month. at Chester RUFC. Thursday. al Penanwel Village Han, Parranwee Ni Aucidand Co Durham. CILIA 6EH. Tel 0388-606819 Walters, G6YAL 6 Viclona Sheel. Anrelon Hare Lane. Vicars Cross. Chester. Derails from Mr D Truro. 2nd Monday in the mom h. at Trelegh Church DARLINGTON & OARS. G4ZVH. Meets 7 30pm on G C Hicks. 061FA. Beggars Roost. 12 Toil Bar Rd. Trelegh, Redruth. Cornwall Details tram Mr Fridays. al Hunvorth Grange. Hunvorth, Darlington, Derbyshire DES 7GS. Tel 0773-835546 BOLSOVER ARS, G4RSB Meets 8 00pm on Cnstleon, Chester. CH3 50X Tel. 0244-336639 Norman Pascoe. GilUSB, Weshvynds". Loscombe Co Durnam Details from Mr A Marviood.GODTV. 5 Wednesdays. at Black Bull Hotel, Bolsover, CONGLETON RC. GDCRS Meets 8.0Gprn on 1st Lane. Four Lanes. Redruth Tel: 0209.212314 Willem Close, Darlington, CO. Durham. 01.3 OUJ Derbyshire. Derails Iront Jack Peon. G4UPA, 22 Wednesday in the month, at The Library. Congleon. ENGLISH CHINA CLAY RC. GOECC Meets Monday DERWENTSIDE ARS. G4PF0 Meets Wednesday Cheshire. Deals Iront Mr R A Turner, G6OKN. 53 evenings. al The Laboratories, ECC Peter/an Road. evenings. al The Steel Club. 36 Medomsley Road. Sandhers Road. Bolsover. Chesterfield. Derbyshire, Queens Drive. Sandbach. Cheshire, CW11 9BN. Tel St Austell, Cornwall. Details horn Mr MC Porter. 127 Cansen, Co Durham. Details from Mr D Plumbrdge. S44 BEY Tel 0246-824924 0270-765005. St Mary's Road. Brscovery, Par. Cornwall. PI.24 21-IA G3KMG. Rose Cottage. Castleside. Conseil Co BUXTON ARS. G4SPA Meets 7.30pm on 2nd and 4111 ELLESMERE PORT & DARS. G3CSA Meets 7.30pm Tel: 072681-3935 Durham. DHEI SAW. Tel: 0207504198. Wednesdays. at Haddon Hall Hotel, London Road. on alternate Tuesdays. at The Grosvenor Hotel, MOUNT'S BAY ARC, R5914DO. Meets irregularly. DURHAM ARS. Gill/TV Meets Friday evenings. at Buxton. Details from Derrick Carson. G4IH0, 28 Harris Road. Nalgar Hill Bunion, Derbyshire SK17 Ellesmere Pon. Soulh Wirnal Dees horn Mr T Deans horn Mr C B Stoakes. GOBBA. Stridden Durham Gee Club, Mount Pleasant, Durham Details Bromsgrove.G4STZ. 53 Dublin Croft, Great Sutton. House Heel Sludden Hill. St Ives, Cornwall. TR26 from Mr P Healey. GOAGG. 7 Midhill Close. Langley 9JS. Wirral, L66 2TD. Tel: 061-339 7201 2DU Park, Co Durham, DH7 STY Tel: 091-373 1487 DERBY & OARS, 021/1. G3ERD. Meals 7.30. Wednesdays, alt19 Green Lane. Derby. Delalts horn MACCLESFIELD 8 DARS. Gams. GI MWS Meets NEWOUAY & OARS. G4ADV Deals from Mr Slareey EASINGTON ARS, G4APN. G6APN. Meets Thursday 8.00pm on Tuesdays. at The Femen Club. Oxford Etworey. G1ZNC. 17 Castle Hi Court. Cross Lane. evenings. at Southsde Social Club. Serene». Mr Kevin Jones. G4FPY, 20 Pinecrolt Court, Road. Maccteshard, Cheshire Details Rom Mr JR Bodmin. Cornwall Tel: 0208-78406. Easington Village. Pelenee. CO. Durham. Deets Oakwood, Derby DE2 2LL Tel: 0332.669157 Thomley. GINUS, 270 Hurdskeld Road. SALTASH & DARC. G4GXK. Meets le and 3rd from Mm T Luxmore, G3AWL. Cambrag. Stockton DERBYSHIRE FIRE SERVICE ARS. GOOFS. (Open Macclesfield. Cheshire. SK10 2PN Tel 0625-24534 Fridays in the month. at Toc H Han. Warralon Road, Road. Easington, CO. Durham Tel 091-527 0153 only to tire service members) MID-CHESHIRE ARS. G3IrT Meets 7 30pm on Saltash. Cornwall Details from Mr K Hare GOAKH,. GREAT LUMLEY R & ES, G4EUZ Meets Wednesday DERBYSHIRE HILLS CONTEST GP, G4ZAP. Wednesdays. at The Colebrook Visage Hall, 58 SI Stephens Roaa. Saltasn. Cornwall, PL12 4BJ. evenings. at Community Centre, Great Lumley, Co GLOSSOP & DARG. GOGLO Meets Last Tuesday in Colebrook. Taporley. Cheshire. Deers Irani Mrs E P Te1 -07555-3277 Durham Details from Mr K Wes, G4MSF, 7 the month . at Nags Head HMO. Charleslown, Fraser. G ISIS, 9 Hunters Hill, Kingsley. Warrington. Turtsole. Learn Lane Esiale. Gateshead. Tyne & Glossop. Derbyshire. Details from Mr G Sims, WA6 8DE Tel 0928-68153. C O ANTRIM Wear, NE10 8E X. Tel. 091469 3955. 040100.85 Surrey Street Glossop, Derbyshire. SOUTH CHESHIRE ARS. G6TVO, GETWB. Meets Council Zone F TYNE & WEAR AG. GE13TW Details from Mr W SK13 9AJ. 04574-5810 8 wpm on 2nd Monday in the month. at LMR Sports RLO: Belfast: Gordon Curry, GIRATZ. 28 Cleave. G8YWK. 8 Abbey Road. Durham, DH1 500 EVETS COMMUNICATION LTD ARC. GEECL Dears Club. Goddard Street, Crewe. Details from Mr CR Beechill Park South, Belfast BT8 4PB. Tel: Tel, 0385-45425 eo 121-125 Green Lane Derby. Wiseman. G1PUV. Whiffler. re Whitenclge Road. 0232-795307. Co Antrim: please refer to NOTTS & DERBY BORDER ARC. G4NID. Meets Kelsgrove. Stake-on-Trent. Sil 4TH. Tel. Zone F Council Member, C O FER MAN A G H 7.30pm on Tuesdays. at Marlpoot Used Reform Church. Chapel Street. Maripool. Ilkeston, 07816-73185 BALLYMENA. GI3FFF. Meets 8.00pm on Thursdays. Council Zone: F UKFM GP WESTERN. GB3MP al 70 Nursery Road. Graced, Ballymena. Co Antrim RLO: Please see under Co Armagh Derbyshire Details from Graham Bromley, G4UTN, WARRINGTON ARC. G4CDA. GEWRC Meets Derails from Mr J P Clarke, GI4HCM 5 Haterton LOUGH ERNE ARC, RS5I643 Meets 8.00pm on 3rd 46 Independani Hill, Arlreon. Derbysnire DE5 7DG. 8.00pm on Tuesdays. at Grappenhall Community Park, Ballymena Co Mum. BT43 ONE Thursday in the month. at Railway Hotel. Ennisiullen Tel. 0773934308 Centre. Bell House Lane. Warr...ten Deters horn Mr BELFAST RSGB GROUP Meets 3rd Wednesday m Co Fermanagh Derails from Mrs V Graham. NUNSFIELD HOUSE ARG, G3EE0 Meets 7.45pm on Gordon Carter G4SCI 40 Havisham Close. the month at 8 00prn at Belmont road. Deets from G 011 BEW, Cavan Carragh. Lisbellaw, Co Fermanagh, Friday, at Nunsfied House. Bolton Lane. Menton, Bachwocd.Wamnetun. Tel 0925-823451 Curry, GI6ATZ Tel: 0232-795307 BT74 6BN Derby Deets from Mr J M Robson, G4PIY. 31 WIDNES 8 RUNCORN ARC. GOP WA CAFIRICKFERGUS ARG. GIOLIX Details to Mr H. K Merton Avenue Lffileover Derby. 083 7FY Tel Knocker 27 Loughwew Drive. Canicklergus. Co C O LO N D O N DER RY 0332-767994 CLE V EL A N D Arum Council Zone . F TOR AMATEUR RADIO ASSOCIATION GOKPT Meets at 7.30 pen every Tuesday SI Giehound Holel, Council Zone: A CITY OF BELFAST YMCA. GI6YM Meets 7 00om RLO: ¡also for Northern Ireland Norlh) Cromlord. Nr Matlock Derbyshire Details from John, RLO: Malcolm Brass, G4YMB, 11 Leaholm Tuesdays. al Club Room. 4Ih Floor YMCA Posl vacarrt, please refer to Zone F Way, Gulsborough, Cleveland TS14 8LN. Wellington Place, Bellast, BT1. Council Member. C. Kelly. WN W_ 7 Calngwood Crescent, Matlock, Derbyshire DEI 318. Tel: 0287-38119. COLERAINE & OARS. GI4NRO. NORTH WEST OF IRELAND ARS. GI3CFH Meets STOCKTON & DAM. G4XXG Mees Wednesday EAST ANTRIM ARC. GI4KKK. Menlo at 8 Men on 8,0045m on Ist Monday in the month at Prehen evenings. at Bilingham Community Centre 2na Wednesday in the month at Torrance Memorial Mumma' Boat House. Victoria Road. Londonderry D E V O N Council Zone: 0 Behngharn Cleveland. Deters from Mr G Noeie, Hail Deep. Co Antnm Deets from Mr H W B Details Item D I Fulton. GI4OUN, 21 Akie Roe GOEJX. 2 Kodeton Grove. Stockton-on-Tees, Davidson 014EITG 55 Ballydral Road. Beady. Strabane, Co Tyrone. BT82 000. Tel 0504 RLO: Dave Livsey, G4BOH, 18 Tollards Cleveland, TS20 10R. Tel. C642-555923 Newtownabbey. Co Antrim 13136 6PA 02313. 6-1529 Road, Countess Wear, Exeter EX2 6JJ. TEESIDE PG. GB3TS Derails from Mrs P M Brand 49277 Tel: 0392-79876. G8MEIK. 5 Believe Drive. Normanby. LAGAN VALLEY ARS. GI4GTY Meets 800pm on 2rd C O TYR O NE APPLEDORE d DARC, RS91376 Middlesbrough. TS6OSO. Wednesday, at Harmony Hel Ans Centre. Harmony Council Zone: F AXE VALE ARC. G8CA Meets 151 Friday in the mean Hill. Lrsburn, Co Antrim Details Item Mr P RLO: Please see under Co Londonderry Deters from Mr B Newland. G3VW. Ham House. CL W Y D Harbmson. GI4NEZ. WEST ULS E Lyme Road. Uplyme, Lyme Rego. Dorset Tel Council Zone: E LARNE & OARS. G14PHA. Meets 8.00pm on tot 02974-5282 PLO: Peter Higgs. GW4IGF. Outten, Wednesday alternate months (starting January). el C U M B RIA BOTCHILL HOUSE 1ST ARS. GOEMU Parkside, Rossett. Wrexham. Clwyd LL 12 Curran Bowling Club. Curran Road, Larne, Co Council Zone: A BRITANNIA RC. RS3811) lOpen 10 college staff • students only). Meets uregulauly during term lime OS P. Tel: 0244-570212, Antrim Details from Mt W Adamson. G14CPP 12 RLO: M GIbbings, G3FD W. 5 Meadowbank ALYN 8 DEES1DE. GWOGZR Meets 6 00pm on Greenland Walk. Ferns Park West Larne. Co Antrim. Lane. Grange over Sands. Cumbria LAl 1 Details Irons Breantsa RN Cortege. Dartmouth, alternate Wednesdays at British Steel Sports & 5T4C lNJ Tel 0574.75407 7AT. Tel: 04484-2435. Devon Tel, 08043-2141 Ex 371 Social Club. Family Room. Rowley s Dnve. Shelton. ANGLO-SCOTTISH REPEATER GP 05345 Meets DARTMCX)R RC. GI RCD Meets irregularly due to contest interest Details from Mr C R Brown 12 Dees« Details Iron Mrs Pauline Coburn. GW1STJ. C O AR MA G H lot Weenesday o the month. ai Grovenor House 54 Oueensway Hoge, Wiexham.CLivy(1. LL129PE Council Zone: F Hotel Carlisle Niels Iront Mr Robb,e Adamson, Hessary Terrace, Princerover Yeomen Devon., PL20 6RB Tel 0978.760702 RLO: (also tor Northern Ireland South) GM6KWU. 29 South Square Newcastlelon. CON WY VALLEY ARC. GW6TM Meets 8 00pm on 1st Danny Campbell. GIANKO. 109 Drumgor Roxburghsthre. TOS GOE EXETER ARS G4ARE Meets 2nd Monday in the

84 RA DIO CO M M U NICATION O CT OBE R 1989 M U M :ere ti ng W e e„

month, al Communny Centre. St DavidS HA Exeter Detain nom Mr John Young, GM6LYJ. 22 Tuesday in the meth. at Marconi College, Arbour Cheltenham, Glos, 6152 4SF Details from Mr Roy Details from Mr R J Donno, G3Y81(, 6 Minangtake Hallmeadow Plate, Armen. Demises, 0012 602 Lane Chemslord, Essex Details from Garr. Godwin. G4YIX, 65 Lilleslield Avenue. Benwood, Road. Exeter. EX4 7EA. Tel: 0392-78710 Tel: 038754056 G4FKH. 21 Borda Close. Chelmsford. Gloucester. GL3 3AH Tel. 0452417145. EXMOOR RC. G4SSS. Meets at South Moulton Comp MAXWELLTOWN ARC, GMOAEE Meets 8.00pm on Essex, CM' 4JY. TeL 0245.260831 STROUD d OARS. RS87839. Meets 7.30pm on School, Old Alswear Road. South Moulton. Devon, 1st and 3rd Wednesdays in the month, at club CLACTON RC. G3CRC. Meets 7.30pm on 1st and 3rd alternate Tuesdays. at Scout HO. Parliament Street. E 036 3110 Details from Mr P Dixon. co South premises at rear of Lincluden Inn. Abbey Lane. Wednesdays in the month. at Eldorado Club, The Sisley Road. Stroud, Gros Details from Mr Mike J Moulton Comp School. Old ALswear Road, South Linduden. Dumfries. Details from Mr Crosbe D S Broadway, Jayerek. Clacton-on-Sea. Essex. Details Mills, G3TEV, Sheen 3 Tylers Way. Chatlord Moulton. Devon. EX36 3H0. Rodgers. GMINNC. 5 Elder Avenue. linduden. from Mr Reg Taylor, GITCT. 14 Meadow Way. Stroud. Glos. GL6 8ND. Tel' 0453.882476 EXMOUTH ARC. G4H08. Meets alternate Domines. 002 ONL. Jaywica. Clacton.on-Sea, C015 2SK. Tel: 0255- sTRouo ARS. G4SRS. Meets alternate Thursday Wednesdays. at 6th Exmouth Scout Hut Marmot Hill. WIGTOWNSHIRE ARC. Gla4RIV Meets 7 30pm on 430466. eventrigs. at Red Cross Centre. Centress, Nr Exmouth Details from M Newport. G1GZG. 30 Thursdays. at Community Centre, Lewis Street COLCHESTER ARS. G4CRA Alternate Thursdays in Street GloS Details from Mr Mann Lawson. GOFC,I. Manstow Avenue, Exmouth. Devon E X8 3JF. Simmer, Wigtownsture Details from Mt Gerry the monlh. at The Gilberd School, Brinkley lane. 13 Cresent Close. Stone Hoase. Glos. Gt..10 2AP KELLY COLLEGE ARS. G4COF 'Open only to Maxwell, Northbrae. Brookleld Crescent Stranraer. Colchester. Details from Mr Frank Howe. G3FLI, 29 Tel 0453-822759 College stall and enfant Detain from Mr R Hooper, DG9 OHY Tel: 0776-2876 Kings-wood Road. Colchester. Essex, CO4 538 Co Kelly College, Tavistock. Devon, PL14 OHZ Tel 0206851189. G R A MPIA N 0822-2081 DYFE D ESSEX REPEATER GP. GB3DA Details co 40 Council Zone: G NORTH DEVON RC, FIS37569. Meets 1st Wednesday Council Zone: E Fenton Walk, Shotgate, Weliford, Essex. RLO: Allan Duncan, GM4ZUK, 69 in the month at Merocentre. Unit 1 Barbican RLO: (also for West Glamorgan) W M GEC ELECTRONICS ¡BASILDON) ARS. GOGEC. The Abbotshall Drive. Cults. Aberdeen AB1 industrial Estate. Barnstable. Devon Details from Mr David, GW4WMO, -Sirmione", Freestone Shack. GEC Avionics Social Club. Gardners Way, 9JJ. Tel: 0224-861550. C B Searle, -Brynon, Great Torrington. Devon. EX38 Cross. Cresselly. Kilgetty, Dyfed SA68 Basildon, Essex. Details from Mrs Crosse Morrell, ABERDEEN ARS. GM3BSO Meets 7.30pm every 7EN Tel: 0805-23764. OSX. Tel: 0646-65168. 6801V, 40 Fanion Web, Shotgate, Weklord. Essex. Friday. al 35 Thistle Lane nuSt on Thistle Soot). PLYMOUTH CFE RC. G4VKO. (Open Only to college ABERPORTH (DYFED) ARS. SS11 80T. Tel: 0268-22822 Ex 3386 Aberdeen Detels from Frank Duller. GMOCSZ, 68 students). Details (rom iber N Pearce. Students Union GW4SZV. Meets 7.00pm on Wednesdays, HARLOW & OARS. GOUT Meets 8.00pm on Monde Drive. Potilehen, Aberdeen, A81 40Y. Te Kings Road. Devonport. Plymouth, PL 1 SOR Tel at Building No 17, The Airfield. Aberporth. Tuesdays. at Mark Halt Barn. First Avenue. Harm on. 0224-780519. 0752-264714. Dyfed. Details from Mr Roy Davies. Helen Essex Details from Mr P C Hayward, G4PGB, 82 BUCHAN ARC. GMOFHE PLYMOUTH POLYTECHNIC ARS. G3TCP ¡Visitors Lady Road, Blaenporlh, Cardigan. Dyfed. Falconers Park, Sawbrelgeworth. Hens, 64121 TAU GRAMPAtN REPEATER GP, 603614. GB3NG. welcome by prior anangmenh. Meets irregJiaily Tel: 0239-810205. Tel' 0279.722618 GB3AB, GB3PD, GB3BA Details from Keith Innes, daring term tune, at Students Union. Prymouth Poly, ABERYSTWYTH RSGB Group. Meets 7 30pm on 2nd LOUGHTON & OARS. G4ONP. Meets 8 00pm on The &faddy. Drumbiade. Runny. Aberdeenshire, ABS Drake Circus, Plymouth. PL4 8AA Details from the Tuesday 01 the month, at The Bay Hotel, atternate Fridays in the month. at Debden Community BOJ Secretary. Co Students Union. Plymouth Polytechne. Aberystwyth. Dean from GWOGLT. Centre, Leighton Hall, Rectory Lane. Loughton. MORAY FIRTH ARS. Gla3TKV. Meets Wednesday Drake Circus. Plymouth. PL4 84A Tel 0752.264654 CARMARTFIEN ARS GW4YCT Meets 7.30prn cm 2nd. Essex. Details from Mr John Ray G8DZH, 9 Abon evenings. at Moray College ot Ertucation Egn PLYMOUTH RC. G3PRC. and 4111 Freers in the month at Boat Club. The ., Hil.Loughloui 4RA. Te. 01.508 3434 Detain Itom Mr Atan was, Glory, am, South S1DMOUTH & OARS. GOAXC. Quay. Carmarthen Details from Mr W O Hughes. MAYLAND d OARS. 04TVI Details from Yvonne Godly Sneer Elgin. Moray Tel 034341549 SOUTH DEVON ARC. G4SSD GW4ZXL. 31 Ystrad Drive. Johnstown, Carmarthen. Taylor. Oak Lodge. Mal Road. Great Team. Essex ROBERT GORDON S INSTITUTE OF TECHNOL- TIVERTON RC. G4TSW Deta4scoP 0 Box 3. Dyleo. SA3I 3P0. Tel: 0267.231359. CM9 8011 OGY. GM3TDI ¡Members of staff d students at Twenon, Devon FISHGUARD d OARS. GW0A0C Meets 7.30pm on. MARTLESHAM DX CONTEST GP, GOKPW. Details 0. AGIT only) Meets ereguiarty, at School 01 Electronic TORBAY ARS. G3NJA Meets alternate Thursdays d Wednesdays. at Radio Shack, Further Ed Centre 0 Fishers Farm, Cotchesier Road, Tendrrng. & Eke Eng. AGIT Detain from Dr R J Teperek. Ses Fridays 401 Sal in lire month. at ECC Social Club. Ropewalk, Fishguard, Dyfed Details from Mr 8 Cart. Claditori-on-Sea. Essex or Electronic & Elee Eng. AGIT Schoolhill, Hsghweek. Newton Abbot. Devon Details from Mr D GW3DWY, Killarney, Plasy Eton, Frshguard. Dyled. ROCHFORD & DRC. GOARR Meets 8.00pm on last Aberdeen Webber G3LNJ 43 Lime Tree Walk, Milbe, Newton 'Tel: 0348872671 Friday in the month. al Rocheway Centre. Rochway. SPEYSIDE REPEATER GP, GB3SS, GEL3KM Details Abbot. TO12 41F Tel, 0626.54437 LLANELLI ARS. GWOEZO Meets 7.30pm Mondays at Rochlord. Details tram Mn Denis Taylor. G3FGC. 36 from Mr E Brurnby, GM8YKT. 14 t Mornston Road. Coteshd Day Centre. Coreshal Terrace. Llanelli. Poraars Avenue. Hawkwel. SS5 4NA, Tel 0702- Eton Morayshire. Tel . 034344255. D O RSE T Opted. Details from Mr P K Williams. GW4ZYG, 30 206887 Council Zone: D New Street. Banyport Dyfed. SA16 OAT. SOUTH ESSEX ARS, G4FISE. GORSE. Meets 8.00pm GREATER LOND ON RLO: Post vacant. please refer to Zone PEMBROKE & DARC. GW2OP. Meets 8.00Orn last on Wednesdays. at The Paddocks. Long Road, Council Zone: C Council Member. Friday of the month.. at CEGB Sports Club. Main Canvey Island. Essex. Details from Mr Albert Smith. RLO: North: (also for Hertfordshire) Roy BOURNEMOUTH RS. G2BRS. GIBRS Meets 8.00pm Street, Pembroke Dock, Dyfed. Details tram Mr D J G4FMK, 8 Parkway. Convey Island. Essex. SSS OAA Charlesworth, G4UNL. 6 Curzon Avenue, on 1st and 3rd Fridays ill the month, at Kinson Workman. GW6EHC. 103 High Street Pembroke Tel 0268-663805 Enfield, Middx EN3 4UD. Tel: 01-804 5643 . Community Centre, Kinson, Bournemouth, Dorset. Dock. Dyfed. SA72 6PE. Tel 0646686532 SOUTHEND & OARS, 650K. G8MRS Meets 8.00pm South: (also for Surrey) Robin Sykes, Details horn Mr Vince Coombs, GaDJG. 10 Maxwell PEMBROKESHIRE RS. GWOEJE. Meets 7 30pm on on Fridays. at Rocheway Centre, Rocheway. G3NF V. 16 The Ridgeway, Fetcham, Road, Winton, Bournemouth. Dorset 81-19 1D4 Tel Mondays. at Further Education Centre. Tower Hill. Roctiford. Essex Details nom Mr Alec C Adams. Leatherhead, Surrey KT22 9AZ. Tel: 0372- 0202-526793. Hawke:Mee. Dyfed. Details horn Mr P Delaney, G3Y0A, 9 Farland Close. Rayleigh, Essex, SSS 372587. FLIGHT REFUELLING AAS, G4RFR. GEFSR GW1TUA. Rosedale. Studdolph Steynton M4lord. OPA Tel - 0268-781126. ACTON. BRENT & CHISWICK ARC, 031113 Meets GOFRR. Meets 730 pm on Wednesdays and Haven. Dyfed, SA73 3UN. Tel - 0348-881346. STANFORD-LE-HOPE 8 0/SAC. G4SLH Meets 7 30pm On Tuesdays. al Chiswick Town Han, High Sundays. al Fight Refueling Social Club. Mertey, 8.00pm on Mondays. al St Joseph Parish Rooms. ROad, Chiswick. London, W4 Details from Mr W G Wenborne. Dorset Details from Mi John Gooder EAST SUSSEX Stratton Road. Stantord.le.Hope. Essex Details from Dyer. G3GEH. 188 Gunnesbury Avenue, Acton G6AZV. 61 Martin Close, Creekmoor. Poole, Dorset, Council Zone: C Mr Tom Conne?. G8E X0. 32 Hope Avenue. Stanford London, W3 818 Tel. 01-992 3778 BH17 7XS. Tel: 0202-602362 RLO: Jim R Harris, G4DRV, Upton, ie.Hope. Essex. SS17 8011 Tel: 0375643078 ADDISCOMBE ARC, G4ALE Meets 9.00pm on PLESSEY (CHRISTCHURCH) ARS, RS88206 Meets. Crowborough Hill, Crowborough. East VANGE ARS, G3TCW Meets 8.00pm on Thursdays. Tuesdays. al Lion inn Pawsrans Road. Croyoon 8.00pm on 2nd Tuesday in the month lor main Sussex TN6 2DA. at Barnstable Community Centre. Basildon. Essex Details from P J Hart, G3SJX. 42 Gravel Hill, meetings: open every Thursday lot other activities al BRIGHTON & DRS. G4GOR Meets 8.00pm On 1st Details from Mrs D Thompson, IC Fussing Row. Addington. Croydon. CRO 500 Tel 014569054 Plessey Sports & Social Club, Grange Road. and 3rd Wednesdays in the month. at The Seven B eeld0r Essex, SS14 1TE "TeU 0268•552606 AQUILA ARC. G3BRK Somerford. Dorset Details horn Mr Simon Smith, Furlong Bar. Brighton Race Course. Brighton. Details ARIEL RADIO GP (London G8B8C (Open only to GOFOZ, 14 Cadhay Road. New Milton. Hants BH25 from Mr P J S Turner, 6411L. Flat 6. 132 throe FIFE BBC emptoyeesl 5X4 Work 0202404658. home 0425418860 Note.. Parade, Brighton, BN1 IDE Tel: 0273407737 Council Zone: G ARC llonclonf G4MMK (Open only to emptoyees) this crub n not restricted to Plessey emeyees • all CROWBOROUGH & OARS. GOCRW RLO: (also for Tayside) Martin Hobson. BARKING R 8 ES, G3X8F Meets Mondays Tuesdays are welcome. HASTINGS ERC, 6611H Meets 7.30pm on 3rd GM8KPH, 17 Well Brae, Pittochry. and Thursdays. at Westbury Centre. Ripple Road POOLE RAS. G4PFIS. Meets 7.30pm on last Friday in Wednesday in the month. al West Hal Community Perthshire PHIS 5H11. Tel: 0796-2140. Barliing. Essex. Tel:01-594 0291 the month. at Commanders House. Constitution Ha Centre. Croft Road Hastings. East Sussex Deans, GLENROTHES S DARC. G1.14GRC Meets 7 30pm on EOGGIN HILL ARC. RS89(130. G4ROT Meets 8.00pm Road, Poole. Dorset. Details from Md V Conon. from Mr D W Shirley. &INV°. 93 Allred Road. Wednesdays. al Old Nursery Building Provost Land on 3rd Tuesday In the month, at Victory Social Club. G3BCI, 45 Branksome Fill Road. Bournemouth. Hastings East Sussex. TN35 514Z Tel 0424.420608. Details rom Mr John Hardwick, Gal4ALA, 4 Kecheli Gardens. Hayes. Bromley. Kent Details tram Dorset. 0114 9LF. Tel. 0202.760231 HASTINGS REPEATER GP. GB3HE Hi:Inwood Avenue, Wffinnynowe, Glenrothes. Mr G S Merle. G3UMI, 142 Hayes Lane. Hayes. SOUTH DORSET REPEATER GROUP, GB3SD. SOUTHDOWN ARS. G3WOK. Meets 7.30pm on Kars 3PF Tel 0592742763 Bonney Kent. 682 9EL GE130P. GB7SD. Details from Mr Gout Watts, Tuesdays and Fridays. at Hadshani Leisure Centre. BRITISH TELECOM HO ARG. G4THO (Open only to GOEVW, 46 Links Road. Westham, Weymouth. Vearage Lane. Hartshorn. East Sussex. Details from GL O U CESTE RS HIRE BT employees). Dorsal. DT4 OPE Mr C R Evans G4VOS. Oaksde. Waldren. Council Zone: 0 BRUNEL UNIVERSITY ARS G3UBR. Details from SOUTH DORSET RS. G3SOS. G8SOS, Mees Heaneed. East Sussex. TN21 ONG. Tel 043S2 RLO: F W Mills, G4XXA, 66 Beeches Road. Students Union. Brunel Unversny. Uxbridge Middi 7.30pm on tut Tuesday in the month, at The Wessex 3168 Charlton Kings, Cheltenham. Glos GL53 UB8 3PH Stadium. Granby Inctustnal Estate. Weymouth ONO. Tel: 0242-579094. CITY UNIVERSITY ARS. G3UCU (Often only to Details (rom Mr Konrad R Menzel. GOFIT. 8 Higher ESSE X CHELTENHAM ARA. G5BK Meets 7 30pm on 1st and university students) Bockhampton, Dorchester. Dorset. 012 80J. Tel. Council Zone: C 3rd Fridays m the month. at Stanton Room. Charlton CIVIL SERVICE ARS. G3CSR Meets 1230 pm at Civil 030567596. RLO: Post Vacant, refer to Zonal Council Kings Library. Cheltenham, Clos. Details horn Mrs Service Recreation Centre. Mond; Street WESSEX AMATEUR WIRELESS CLUB, G t WAW No Member. Pauline I Cratchley. G8M2V, 217 Prestbury Road. Westminster. London SW1 on the 1st and 3rd regular meeting are herd. but details can be obtained R:4A.INTREE 8 OARS, G4JX0. G6BRH Meets Cheltenham. Gets GL52 3ES Tel. 0242-42336 Mondays ol the month Details Rom Mr C.P Woolley from Mr Ken Powell. GI NCG. 17 Shrestal Close. 8.00pm on island 3rd Mondays in trie mantra at The GLOUCESTER ARS, G4AYM Meets 7 30pm on G6IMM 195 Conisburgh Gres Caned. London SES Hamwonhy. Poole. Dorset. BH16 MU. Tel. 0202- Community Centre. Victoria Road (next bus snit Wednesdays. at St John Ambulance HO. Heathwte , G3G44 H3N7 CL2ISFFTOTNel 0 Is-98 °referee. Essex. Deals from Mr Derek Brads Road. Gloucester. Details from Mr Nick Negus. AR 6 Meets 8.00pm on Fridays. at GOIZW. 3 CdOnannast Braintree Esser CM7 7SI. G6AWT. 41 Oastass Lane Longlevens Gloucester, 'The Duke of Moony . Junction Gelletty Road d Krno DU MFRIES & GALLO WAY Tel 0376-44908. GL2 9HP Tel 0452.504515 Road, New Cross LOnden SE14 Details horn Mr Council Zone: G BRENTWOOD & DARS. GOFINt Meets alternative GOVERNMENT COMMS HO ARC G3SSO Details Ma ns Brown, GODCG, 119 Brealispears Road. RLO: Post vacant, please refer to Zone G Tuesdays. al the Hermitage. Shenlield Road. from GCHQ Amateur Radio Club, Priors Road, Brockley London. SE4 1TY Tel 01491 2341 Council Member. Brentwood, Essex Details from Mr Joe Wentworth. Cneltenham, Glos, GL5 5AJ. COULSDON AIS. G4FUR Meets 8 00pm on 2nd DUMFRIES & GALLOWAY RA 8 EC. GM4HAA. GOFED. 5 Si Charles Road, Brentwood, Essex. SMITHS INDUSTRIES RS. G4MEN Meets 8 00pm on Monday and last Tuesday in the month. al SI Meets 7.30pm on le and 3rd Monday in the month at CM144TS. Tel 0268.402829. alternate Thursdays in he month. at Sports & Social Swabian Church Han Grovelands Roan Pettey. Catgenholm Hotel, New Abbey Road. Dumlnes CHELSMFORD ARS. RS38117 Meets 7.30pm on 1st Club Office, Evesham Road on Bishops Cleve, Surrey Dews from Mr A R Bane, 105 Mayfield

RADIO C O M MU NICATION OCT OBER 1989 • 85 f fflt a r eger ,

Road, Thornton Heath. Surrey. Tel: 01-684 0610. W MIDDX AG. G I WMG. ABERGAVENNY RS. GW4GFL Meets 7 30pm FARN8OROLIGH & DRS, G4FRS, GEMS. Meets CRAY VALLEY, G3RCV. Meets 8.00pm on 1st and 3rd WIMBLEDON & ORS, G3WIM, G8WIM. Meets 8.00pm Thursdays. at Residential College. Perry-Pound, 8.00pm on 2nd and 401 Wednesdays in the month. at Thursday in the month. al Progress Hall, Admiral on 2nd and last Frelays in the month. at St Andrews Abergavenny Gwent. Details from Mr R. Lloyd, Railway Enthusiasts Club. 103 Hawley Lane, Seymour Road, Eltham. London, SEO. Details from Church Hall. Herbert Road, wargyedon, Lon don. GW410A, Uwyn Celyn.Pandy.Abergavenny, Gwent. Farnborough, Hants. Details from Mr Mike Hearsay, Mr B Rowe, G4WYG 28 Malyons Road, Hertable, SW19. Details from Mr Lawton. G6AJY, 115 NP78DN. Tel: 0873-890681. G8ATX. 'Halcyon'. Lawday Link. Upper Hale. Swanley, Kent ORO 7RE. Tel: 0322-613296. Bridgewood Road, Worcester Park. Surrey. Tel: 01- BLACKWOOD & OARS, GWEGW. GWEBK. Meets Farnham. Surrey. Tel: 0252-715765, CRYSTAL PALACE & DRS. G3VCP, Meets 8.00pm on 330 2703 7.00pm Fridays. at Oakdale Comprehensive School, HAMPSHIRE POLICE ARC, GOLAW, Details cio 30 3rd Saturday in the month. at AJI Saints Parish Room. Oakdale. Blackwood. Gwent Details from Mr Brian Harewood Close. Boyatt Wood. Eas-tleigh. Hants. Upper Nonvcod, London, SE19. Details from Mr GREATER MANCHESTER Matthews. GWCUWF. 25 Manor Park. Newbndge, HORNDEAN & DARC. G4F8S Meets 7 30pm on 1st Geoff Stone. G3F2L. 11 Litho& Crescent. Forest Council Zone: A Gwent, NP I 4RS. Tel: 0495-243858. Thursday in the month. al Merchiston Hal. London Hill, London, SE23 3BN. Tel: Or-699 6940 RIO: Bob Callow, G4ARP, 137 Haven CHEPSTOW & OARS. GW4LWZ. Meets 7.30prn on Road, Homdean, Hants. Deels from Mr F Charnel, CIRM, RS37900. 10Pen only to employees/ Lane, Moo rside, Oldham, Lanes OL4 200. Tuesdays. at Leisure Centre. Chepstow. Gwent. G3C00. 8 Mavis Crescent. Havant Hants. P09 EALING & OARS. G3UUP. Meets 8.00pm on Tel: 061-652 8617. Deals from Mr Dan Taylor. GWOEGH, 7 Oaklands 2AE Tuesdays. at Community Centre, 71 a Nothcroh ARIEL AG (Manchester), 03ETK. (Open only to BBC Park, Portskewett Gwent NP6 4UR. Tel: 0291. IBM (SOUTH HAMPSHIRE) ARC. GOJGL, G7BCD. Road, Ealing. London, W13 955. Details from Mr A G employees). Meets al BBC Club. New Broadcasting 424725 Meets 7.30prn on 2nd and 4th Tuesday rn the month. Fisher, G4VBH, 108 Gaston Grange, Heston. Mdclx House. Oxford Road, Manchester EBBW VALE COLLEGE RS. GW011W. Meets 7.00pm al IBM Social Club, Southmore Lane. Havant, Hants. 1W5 DHO. BOLTON ARC, GOB WC. Meets 7.30pm on Tuesdays. on Mondays. at Ebbw Vale College of FE, College Details from Mr P A Blather, G4KVX. Waterside. 31 EAST LONDON ASGO GP. at The Dean Sports Complex. New York, Juricuon Road, Ebbw Vale. Gwent. Deals from Mr Terry North Shore Road, Hayling Island. Hants, P011 01-IL. EDGWARE & DRS. G3ASR. Meets 8.00pm on Road, Bolton. Details from Mr D Lewis, GI AEO. 468 Hayden . GWOHCH, 7 Mee Close. Ebbw Vale. Tel: 0705-4£4191. Thursdays, at Community Centre, 145 Orange Hill Wigan Road, Bolton. Lance BL3 40H. Gwent NP3 SES. Tel: 0495-305192. IBM IUK) LABORATORIES ARC, G3YXR, G8EXR Road. Burnt Oak. Edgware. Middx. Details from Mr I BOLTON METROPOLITAN COLLEGE, 68SKM. LCR (TREDEGAR) RC, GW4IYD. Meets 7.15. (Open to employees ol IBM only). Meets 7.00prn on D Cope. G4IUZ. 30 Drovers Way. Hatheld. Herts. DIAL HOUSE RS. G3WDH. Tuesdays. at MIM Factory. Woodfield Works, North Thursdays. at IBM (UK) Laboratories, Hurstey House. ALIOOPX. Tel: 07072-65707 DOUGLAS VALLEY, G3BP1( Meets 8.00pm on tot Avenue, Tredegar. Gwent Details from Mr Karl Hureey Pa, Winchester. Hunts Details from Mr FANNY HILL RC, RS85830 and 3rd Thursdays in the month, at Standish Gurmin. GW I EXF. 1 Prospect Place. Georgetown. Graham Walmsley, G4IXE, Warwick Farm House. FERNDALE RS. G4HDT. Consenekve Club, School Lane, Standish, Wigan. Tredegar, Gwent NP2 3JP, Tel: 049525-6560 Crackriore Hard Lane. Marchwood, Southampton. GRAFTON ARS, G3AFT. Meets on 2nd and 4th Lancs. Details Iront Mr D Snape. G4GWG, 30 NEWPORT AIRS. GW4EZW, GWINRS. Meets 7 30pm SO4 4UT Fnadys 8.00pm, at IS Vnzzard. While Han Lane. Cuteross Avenue, Highteld. Wigan, Lancs. WN3 5AA on Mondays. al Brynglas Community Centre, ITCHEN VALLEY ARC. GOIVR, GEIVR. Meets 7.30pm London, N17. Deals from Mr R Haningan. GOJUZ. 7 Tel: 094221 1397. BrYoglas Road. Newport. Gwent. Details hem he 2nd & eh Flidays in the month (except August). at Torr8inglon Gardens. London N11 2AB. Tel: BI-368 ECCLES & OARS. G3GX1, G8GXI Meets 9.30pm on. Kevin Snelling. 91 Oakfield Road, Newport, Gwent The Scout Hut. ¡hayfield Lane, Chandlers Ford. 8154. Tuesdays. at Duke of York Hotel, Church Street. NP9 4LP Tel: 0633-262467. Eaelegh, Hants. Details from Mr Maunce GILWELL PARK SCOUT ARO, G3WGP. GB2GP Eccles. Manchester. Details front Me CG Harrison, PONTYPOOL ARS, GW3RNH. Meets 7.00pm Cheeseman. GlIPO, 63 Ringwood Drive, Noon Meets Saturdays, al Gdwell Park, Chingford. Essex. G8KRG, 53 Peveril Close, Wheeled, Manchester, Tuesdays. at Seilerreet Redden Road. Pontypool. Baddesley. Southampton, S052 9GR. Tel: 0703- Details from Mr TJ Lockyer. 18 Attson Close. M25 5NS Tel: 061-773 7899. Gwent. Deets from Mr Ivor Munson, GW4RJA. 736784. Waltham Abbey. ENO 3NY. Makerlield ARS, GOIGW. Details pia 46 Marlborough Troed-y-Bryn. Ty Trappe Road. Wee Ponmewydd, LYMINGTON & pans. RS85637. Details from Dr HAMMERSMITH HOSPITAL. G4HXX Avenue. Spring View. Wigan. Lanes Gwent NP4 1BH. Tel: 0631372110. Michael Carson. G2AIV. Long Close. Henley Road. HAVERING & DARC. G4HRC Meets 8.00pm on MANCHESTER 8 DARS, G3140X. Meets every RED DRAGON CONTEST GP, GW8GT. Details from Pennington. Lymington. Hants, $041 8GO. Tel: Wednesdays. at Fairkytes Arts Centre, Billet Lane. Wednesady at 7.30pm at the Newton House Pok Brian Davies, 16 Vancover Drive, Penmaen, 0590-672844. Homchurch, Essex. Details from Mr D S J Gray. Commonly Centre, 203 DroyIsdon Road. Newton Blackwood, Gwent. NP2 01.10. Tel: 0495-225825. MARCONI R b ES (Portsmouth), oajmR (open only 06901. 58 Dumont Avenue. Point Clear Street. Heath, Manchester. Details from Mr Don Robson, to employees). Meets 8.00pm on Iasi Tuesday in the Osyth, Essex, C012 &JP G4UYN. 36 Orford Road, Newton Heath. Manchester GWYNEDD month. al Sports & Social Complex. Broad Oaks, HOME COUNTIES ATV GROUP, G6HCT. Details co M10 6JY. Council Zone: E Portsmouth Airport Details from Mr VG Scambell, The Flat. 5a The Broadway. Southall. Middx, MARPLE CONTEST CLUB, G4MCC. RIO: Post vacant, refer to Zonal Council G3FWE. "Solent View'. 78 Slade Road. Ryde, Isle of ILFORD RSG8 GP. G3XRT. NORTH CHESHIRE RC, GOBAA. Details from Mr P J Member. Wight. Tel: 0983-616966. IMPERIAL COLLEGE RS. GM. (Open only to Kirsop, G4WCE, Peel House, 5 Planetree Road. ARFON REPEATER GP, GB3AR. GB3AN. Details ROINNER & OARS, GARFIS. Meets 7.30pm on the first students). Atinncharn, Cheshire, WA15 9JJ. Tel: 061-980 5173. Irom Mr Cecil Owen, GW3P10. 13 Bryntlynnon. Star. Wednesday in the month at Victory Hall, Warsash. 1NMARSAT ARC. G4SAT. NORTH TRAFFORD COLLEGE. G4FXP. Guaseen, Anglesey, LL60 6BA. Tel: 0248-714571. Hants. Details from Mr W S Blythe, 06 WON, KINGSTON & OARS, RS50685. 03KIN. Meets 8.00pm NORTHERN AR CONFEDERATION. 10S87921. DRAGON ARC. GWATTA Meets 8.00pm on Island Seymour Cottage, Forest Road. Denmead. on 3rd Wednesday in the month. al *Aeneen-. 3 OLDHAM ARC. G4ORC. Meets 8.30pm on Thursdays. 3rd Mondays in the month. at Four Crosses Hotel, Portsmouth. P07 SUA Tel: 0705 261977. Berrylands Road. Suer». Surrey. Details from Mr S at Mot:eerie Conservative Club, Reponden Road, Pentraeth Road, Monet Bridge, Gwynedd. Deals SOUTH HANTS INT TELEGRAPHY SOC. 03011. Walters. Tel 01-3976924. Moorside, Oldham. Detaits Iront Mrs KM Celow. trom Mr Tony Rees. GWOFMO. 2 Bryn Poch. (Maley for those interested in HF cwt. Meets 7.30pm KODAK ARS. G4FVJ. (Open only to employees). G4ZEP, 137 Haven Lane. Moorsele, Oldham, Lance, Treeanh, Gwynedd. 1157 4PE. Tel: 0248-600963. on Thursdays. al Portsmouth Community Centre. LONDON AIRPORTS AUTHORITY RC. G4GTT. 01.4 200. Tel: 061-624 7354. HOLYHEAD & OARS, RS87565. Meets 8.00pm once a Matins Road, Portsmouth Details from Mr Terence. LONDON WEEKEND TELEVISION RS. GALWT SOUTH MANCHESTER RC, G3EVA, Meets 8.00pm month. al Foresters Arms, Kingsland, Holyhead. Mottenet 03.12V. 72 Whewonh Road, Portsmouth, (Open only to employees). on Fridays. at Sale Moor Community Centre. Norris Gwynedd. Delaits !fort% Mrs 8 Amen'. 12 London P02 7RU. MARCONI RS (Middy). G2MT. ¡Open only lo Road, Sale. Cheshire Details. rom Mr D Barber, Road, Holyhead, Gwynedd. Tel. 0407.50577. SOUTHAMPTON ARS. G3SOU. G8FAB. Meets employees). G2AKR. 16 Boxgrove Road. Sale. Cheshire. M33 ME IRION ARS. GW4LZP Meets 7.30pm on 1st 7.30pm on 3rd Wednesday m the month. (except NULLARD ARS, G1MRV. 10W. Thursday m he month. at Dolsetau Hall Hotel. Bala Aug.) al Millblook Community School. Green Lane. NEW SCOTLAND YARD ARS, G4NSY. GENSY. STOCKPORT RS, G61/0. Meets 8.00pm on Road. Dolgellau, Gwynedd. Details from Mr M Southampton. Details from Mr Malcolm Troy, (Open only to New Scotland Yd members). Details Wednesdays. at The Blossoms Hotel, Junc of Fowler, GW3GKZ. lys Gwyn. Abergwynant G1UWL, 90 Evenlocle Road, Millbrook, Southampton, horn The Seaetary, Amateur Radio Society. Room Bramhall Rd AS. Stockport. Cheshire. Details from Penmeanpoot Dolgellau, Gwynedd. LL40 tYF Tel. SOI 9EH. Tel: 0701701770. 99. New Scotland Yard. Broadway. London. SW1H Mr ME Betts. G4FFW. 56 Kingswood Road, 0341.422447 SOUTHAMPTON UNIVERSITY RC. G3KMI. (Open lo 004, Falowlied, Manchester. M14 6RX. Tel: 061-224 PORTHMADOG & DARS. RS86362. Meets 7.30pm on university staff a students only) Meets at Student. NORTH KENT RS, G4CW. Meets 8.00pm on lut and 7880. 3rd Thursday in me month. at Harbour Cafe. Union. West Building 'lop floor). University Road. 3rd Tuesdays in the month. at The Pop-in-Parlour. TRAFFORD ARC. GI TRC Meets 7.30pm on Flesknog Railway, Porthmadog. Gwynedd Details Southampton Details from The Secretary, Radio Graham Road, Bekeylieath. Kent Details from Mr Thursdays. al The Sea Cade Un4, Bradshaw Lane. from Mr D Roberts. GW1EGO. 8 Cae Eithin. Club. Students Linos, The University, Highfield. Frank Rhodes, G4WNF, 9 Edwin Close. Bexleyheath. Stretford, Machester. Details from Graham. Tel. 061- /edam!. Gwynedd. LL48 6EF Tel 0766.770298 Southampton. S09 5NH. Kent DA7 50H. Tel: 01-310 6096. 7489804 SUBMARINE ARC. G7DOL Deals Co HMS Dolphin, PLESSEY RC. G4X0V. (Open only lo employees). UMIST AR & ES. G3CXX. (Open only to students). HAMPSHIRE Gosport Hants. QUEEN MARY COLLEGE R & ES. GI XOM WEST MANCHESTER RC. 64M WC. Meets 8.00pm Council Zone: D THREE COUNTIES ARC. G6WWR, G4WWFI Meets RS OF HARROW G3EFX. Meets every Friday. Details on Wednesdays. at Ashy & Tyldesley Miners. RLO: Trevor Emery, G3KWU, 75 Haig 8.00pm on alternate Wednesdays in the month. at horn Mr G Monday. GOGXM. 33 Fisher Road, Welfare Club on Meanly Road. Gin Pit ViO, Astley, Road. Bishopstoke, Eastlelgh, Hants SOS Railway Kolet Liphook. Hants Details II0111 Mr David Harrow. Middx. HA3 7JX. 01.863 2780. Tyldesley. Manchester. Deals from Mr D R Camac. 6JF. Tel: 0703-693673. Lawrence. GAVKC. 39 The Mahings, Liphook. Hants, SILVERTHORNE RC. 035M Meets every Friday al 61100. 6 Wisbeck Road. Tone Fed. Bolton. Lancs. ANDOVER RAC GOARC. Meets 8 00pm le arx13e) 01130 7DG Tel: 0428-723415. 7 30pm al Friday HA House, Simmons Lane, 131.2 218 Tel 0204.24104. Wednesdays in the month, al Wolversdene Club. UK FM (SOUTHERN) REP HOLDING GP GB3SN. Chingford. London E4 Details from Mr Brian Hill at WIGAN P, DARC, GOHRW Meets 7.309m on Love Lane. Andover, Hants Details tram Mr J T Cult, Deets from Mrs Carolyn Wood. 45 Mayeee Close Friday Hill House Wednesdays. at Poorstock Cricket Club. Pooteock G8ALR. 29 Strathfield Road, Andover. Hants. SPIO Badger Farm. Winchester. Hants, S022 4JE Tel: SOUTHGATE RC, G3SFG Meets at Holy Trinity Lace. Wigan. Lancs. Details ham Mrs M E Norton, 2HI-1. Tel. 026423741 0962-51362 Church Hall Wert Green Lanes. Winchmore GODTY. 41 Crestwood Avenue. Goosegreen. Wigan, BASINGSTOKE ARC. G3TCR. G8JYN. Meets 7.30pm WATERSIDE SHORTWAVE RC. G4JYN Meets London. N21. Details from Mir 0 C Olson. G4YLL. 200 Lancs, WN3 6S0. Tel 0942-47416, on Ial Monday in the month. at Forest Ring 7.30pm on 4th Tuesday in the month. at Brachfeld Churchgee Road. Cheshunt Waltham Cross, Herts. Community Centre. Sycamore Way. Basingstoke. Village Halt Hampton Lane. Mac-Meld, Southampton EN8 9EL. Tel. 0992-30051 GUERNSEY & DEPENDENCIES Details from Mr David J Deane. G3201, 10 Stephens Details rom Mr Peter Fry, G4S8F, 54 Studley ST ANDREWS CoE HIGH SCHOOL ARC. RS37458 Council Zone: D Road, Mortimer Common, Nr Reading, Berks, RG7 Avenue. Hollaury, Southampton. SO4 1PP. Tel: 0703- SURREY RADIO CONTEST C, G3SRC. Meets RIO: Steven Gibbs, GU3MBS, 44 Les 3TU Tel: 0734-332777. 892353 8.00pm on tot Monday in the month. al T.S. Terra Prins, Vale, Guernsey. Tel: 0481-57605. COLLINGWOOD RS, G3CRS. WINCHESTER ARC. RS89028. Meets 7.30pm on 3rd Nova, 34 The Wedrons. Croydon. Derails from Mr GUERNSEY ARS, GU3HFN GU8NIS Meets 8.00pm CRAa'A.EY COURT ARG. 04108, 661BA (Open lo Friday in fie month, at BnIsh Red Cross. Durngaie Bernard Wynn. 6701d Lodge Lane, Purley, Surrey, Tuesdays and Fridays. at The Lodge. La Cabinet's, employees 0118A only) Meets at Crawley Court. House. Durngate. Winchester. Deals from Mr CR2 41)N Tel: 01.660 7517. ° W ands. St Martins, Guernsey. Details horn The Winchester, Hants, Details Iron/ Mr S H Andrews, Richard Murray. GI XCT. Barton Mark Lodge. London SUTTON 8 CHEAM, RS37558 Meets 8 00pm on 3rd Secretary. GARS, PO Box tos. Guernsey Tel 04131. G3OGY, Crawley Cl Amateur Radio Gp. Crawley Road. Headbourne Worthy. Winchester, Hants. $023 Friday in the month. al Downs Lawn Tennis Club. 25450. Court, Winchester Hants. S021 20A Tel: 0962-. 7JS. Tel 0951880605. Holland Avenue. Cheam. Surrey Details from Mr J L 822305. Puttody. GOBWV. 53 Alexancea Avenue. Sutton G WE N T FAREHAM & DARC. G3VEF, 081(01 Meets 7 30prn Next month: Surrey. SMI 2PA Council Zone: E an Wednesdays. al Portchester Community Centre. Hereford & Worcester to Wiltshire, THAMES TV ARS. G4T1V. G6TfV. RIO: Peter Dombrowski, G4111 NYO, 30 Weseands Grove, Portchester. Hants. Details from Overseas Clubs THREE A's CONTEST GP. GOAAA Hillary Road, Newbridge, Newport, Gwent Mr SG Davey. 6411G. 31 Sornewell Drive. UKFM GP (London). G83SL. NPi SOD. Tel: 0495-246359. Fareham. Hants. P016 70L. Tel: 0329-234904. National Affiliated Societies

86 RADIO COMMUNICATION OCTOBER 1989 nEvnon.. TALK TO THE WORLD

TAL K KEN W OOD TAL K ATU'S

We are now officially appointed Kellwood stealers TM 1000 I K W ALL BAND ATu — for the South Coast - and carry the t . ing our high power roller coaster this ATU gives effonless complete matching of all long wire. G5RVvertical and coax fed antennas range in stock. Standard Model TMUX10 £168 Heres a Baton Model TM10()OB selection:. Standard TM MOO Kit Form t 38 (Add £.75 carriage 'Or all models) 11111.1) YOUR OWN AMPLIFIER OR ATLI WITH OUR TM 231E 2 Mir mob. £289 TM 431E 70cm mob £318 RANGE (W HIGH POWER COMPONENTS rm 701E 2/70cm mob £469 Roller Coaster 30 pH £28.00 IR 751E 2/70 mobile £599 Var. cap 250 pF (8kv) £19.95 ni 75E 2/70cm 11/held CALI. Var. cap 250 + 150 pi' (8kv) £28.00 TS 711E 2 Mir Multi Mod rs.soi/e//) £799 Var. cap 750 MI' (4kv) £28.00 TS 4-10S HF £1138 Turns Counter (For Roller) £14.95 IS 940S HF £1995 Empty ATU Case £26.00 R2(K)() Receiver £595 2kw Balun Assembly £28.00

TALK ICO M TAL K SCANNERS

We have just been appointed ICON/ We probably carry the largest stocks of scanners in the U.K. ICON/dealers for the South Coast Call Our New Bumper Catalogue features all the latest models. Paul Manin our 1COM specialist Ilere is a selection:- ABIS SCANNER for info and prices. :sew Jupiter II H/held.... £299 PRE-A MP IC - 2SE degeleihn e Call Standard AX7(X) Base.... £575 • 25-2100 Mhz IC - -ISE 71.1cm H/held Call BEARCAT IC - 32E 2/70 II/held Call • Low noise GAAS Fer 200.XLT H/held £229 IC - 3210E 2/70 Mobile.... Call • Variable Gain 100 XLT 11/held £199 IC - R7000 Receiver Call Switchable Band - 100 XL H/held £179 IC - R7 IF. Receiver Call *I' Pass Filters 55 XL H/held £99 IC - 725 EIF TCVR Call NOW STOCK 590 XLT Mobile £199 IC - 735 HF TCVR Call 760 XLT Mobile £229 £79.95 IC - 751 A 111; TCVR Call 145 XL Base £115 IC - 761 HF TCVR Call AOR SCANNERS 175 XL Base £169 IC - 228H 2m/45w 210 XL Base £169 AR 3000 NEW IC - 448E 70/25ss Call Black Jaguar BJ200 Ill £199 AR /002 Sony Air 7 £229 AR 900 TALK ACCESSORIES Sony Pro 80 £299 AR 950 NEW' SCANNER ANTENNAS Sony 1CF 76(K) S/H REMOTE MAST HEAD SWITCHES Nevada Discc)nc (5(1 - 700 Mhz). £24.00 B/Cat 70 XLT se' W131300 Discone (25-130(1 Mhz1£59.95 Large selection of S/H bargains call NEVADA HF2 £39.95 PAIS Colinear (100 - 960 \llizi...£49.95 John Gordon for details Freq:- IS - 185 Mhz Connections:- S0239 Power:- 1.000 W Pep TAL K AMPLIFIERS NEVADA CAS - A2 £49.95 Frey:- DC - 1.3 Ghz Connectors:- 'N' Type Malr(1 ,11, RF POWER AMPLIFIER Power:- 150/300 Watts NARMOMIC 'Rill SADELTA XL.30 Nile IC I5 DX A new electret base tit ¡e. that will give your Kenwood. Yaesu. Icom. or other leading 1 111 111 1 . 1 111111 1 1 11 brand of Transceiver extra B3ooP TC50DX 50Mhz amplifier 'punch' and 'clarity'. The mie M OBILE AMPS may he powered from the B150 180w (26- 30 Mhz) £54.95 B299 300w (3 - 30 Mhz) £115 Transceiver direct or with B300P 300w (2- 30 Mhz £147.52 737 80w (26 10 Mhz) £35.41 an internal PP3 battery. B550P 5(0w (2 • 30 Mhz) £237.00 735 35w (26 - 30 Mhz.) £18.54 Introductory Offer £39.95 TC35 30w 426 - 30 Mhz) £24.95 BI10 110w (142 - 170 Mhz) £145 SADELTA CM 40 Mie TC50 15w (50 - 52 Mhz £29.95 BASE AMPLIFIERS As the XL 30 above, but with Vol/Tone BRL35 45w (26 - 30 Mhz) £29.95 8132 240w (3 - 30 Mhz) £129 Introductory Offer £49,95 BRL40 70w (26 - 30 Mhz) £34.50 BV131 250w (26 - 30 Mhz) £115 NEVADA *DUM MY LOA BRL3I 28w (26 - 30 Mhz) £19.95 13507 300w (3 - 30 Mhz) £278 A professionally built 50 Ohm dummy load that is good 103-Ghz! using 'NI type connector VISA j SEND IN NOW JUST £2 FOR OUR NEW Introductor Offer £29.95 BUMPER CATALOGUE (INCLUDES £2 VOUCHER) NEVADA COMMUNICATIONS WE TALK YOUR LANGUAGE 189 LONDON ROAD, NORTH END, PORTSMOUTH, P02 9AE ORDER HOTLINE (0705) 662145 S.E.M. UNIT P, UNION MILLS, ISLE OF MAN NORTH WALES Telephone: (0624) 851277 ...... , <, ' ------_ , .-:-_;,---,----...,-.- - •• ,•••,-!. . , RADIO RALLY ,.. • ,-,,.. AND ELECTRONICS FAIR

• - See it at 4,...,- Second two day event to be held in North Wales STAND 55 at the Leicester Sales Hall ABERCONWAY CONFERENCE CENTRE, S.E.M. QRM ELIMINATOR LLANDUDNO Do you suffer from local interference? The answer is probably yes If you moved your receiver into the country you would be amazed how quiet your reception on would be. The noises you hear on the H.F. bands are produced by local electrical equipment. Saturday/Sunday, 4th/5th November 1989 This completely new idea, developed by S E.M. can provide the complete 11.00am-4.30pm removal of any of these problems You don't even have to know what or where the source is. It can be your own computer next lo your receiver or r f welding Bring and Buy at ground floor level in the new Arcadia equipment in a factory several miles away. Theatre, raffles, snack bars, etc. The CAM Eliminator connects in your aerial lead (you can transmit through it) it requires an auxilary aerial (this can be ANY other aerial e.g. a 2 metre one, or a 146 stalls including RSGB Book Stall, many Club lew metres of wire, because wide band amplifiers are used to boost the level of Stands, Computers, Components, Radio Electronics, the ORM). Your unwelcome signal will arrive at the two aenals slightly out of 27/234MHz, Satellites, Data Transmission, TV and lots phase and by adjusting the phase ol the signal from the auxilary aenal with the Eliminator controls, you can completely remove it BEFORE IT ARRIVES AT more YOUR RECEIVER, Forget all the inadequacies of noise blankers. this is a new, Bring the family for the weekend. Ample accommodation deferent, concept. Sceptical? As W4CXH in Florida says "The power line noise is S 7 and you are coming through 5 and 4." Practical Wireless review says at low winter rates. One hour from Manchester via new -Does it work? Yes it does Other comments "A remarkable achievement -, "It dual carriageways all the way to rally. works like magic". "It even eliminates rain static - and comments about being able to operate again after years of enforced inactivity because of some local Ample Free Parking. Talk-in on S22 and SU8 problem nef previously curable or even traced, are many. Admission £1.00 Size: 6" x 2' x 3" deep Sockets S0239s. Supply 12 V (10-14) 30 rnA. (OAP 50p. Children under 14 free) Frequency range 500KHz - 60 MHz continuous. May be transmitted through. Price: £79.50 including VAT and delivery.

See it at STAN D 55 S.E.M.Leicester Sales Hall FAX FOR YOUR SPECTRU M UNIT P, UNION MILLS, ISLE OF MAN "I found a quite easy lo select the correct li,tu n g Telephone: (0624) 851277 "I thought this was an excellent system of storage "Very quick and easy to use - S.E.M. TRANZMATCH MKIII. The only Aerial Matcher with UNBAL- "I found the reception of amateur fax signals very simple. ANCED and TRUE BALANCED OUTPUTS_ 1 kW 1.8-30 MHz. £145. "Connections - very straightforward - No interfacing problems at ail" Built-in EZITUNE (see below), £44.50 Built-in Dummy Load, £9.90. Ex "Text Editor fine - Build up a range of more sophisticated screens using a stock. graphics package or digitiser" "Technically fine - Certainly very good value for money - EZJTUNE. Allows you to TUNE UP on receive instead of transmit. Equipment review by Mike Richards FANTASTIC CONVENIENCE. Slops ORM. Boxed unit. £49.50. P.C.B. Practical Wireless, Sept 1969 and fitting wilsruclions to fit in any ATU, £44.50. Receive only, Inc Drum Speed Generator £33.00 FREQUENCY CONVERTERS. V.H.F. to H.F gives you 118 to 146 MHz Transceive, Inc D.S.G., PTT & Tone Generator £63.00 on your H.F. receiver, Tune Fix. 2-30MHz, £65.00 ex stock. Add £3.00 for plus 3 disc H.F. to V.H.F. gives you 100 kHz to 60 MHz on your V.H.F. scanner, £55.00 ex stock. Plug in aerial lead of any receiver. Tuning from 100MHz up. L L J ELECTRCIFIIES LTC. 2 or 6-METRE TRANSMATCH. 1kW, will match anything, G2DYM or G5RV 9 on VHF. £39.50 ex stock. t nit 45, Meadow mill Est, Dixon Street, kidtlerinite,ter DN'10 11111. DUMMY LOAD. 100 W. THROUGH,LOAD switch. £24.00 ex stock, Tel: (05621 753893 vrtSA VERY WIDE BAND PRE-AMPLIFIERS. 3-500 MHz. Excellent perfor- mance. 1.5 dB Noise figure. Bomb proof overload figures. £37 00 or straight through when OFF. £42.00 ex stock. R.F. NOISE BRIDGE. 1-.170 MHz. Very useful for aerial work measures resonant freq and impedance. £49.50 ex stock. 25 The Strait IAMBIC MORSE KEYER. 8-50 w.p.m. auto squeeze keyer Ex stock. LINCOLN LN2 1JF Ours is the easiest to use. £45.00. First class twin paddle key, £2700 ex. stock. J. BIRKETT Tel: (0522) 20767 TWO-METRE LINEAR/PRE-AMP. Sentinel 40: 14, power gain. e.g. 3 W - 40 W (ideal F1-290 and Handhelds), £95.00. Sentinel 60: 6, power, OYMATI LYNX 25 WATT 16 CHANNEL FM 79 TO 110 MEILOASH MOUNT TRANSCEIVER withsuggeslea cOeversion e.g. 10 W in. 60 W out. £105.00. Sentinel 100: 10 W in, 100 W out, details loi 4m (9 , rifl pp (3) CALIBRATED BUMPER MOUNT WHIP ANTENNA wave 3510 60MHz, V. 100 lit £135 00. All ex stock. 170MHz complete with base 20m %An coax and instructions ii-i- £9 95 (pp £31 RECHARG(ABLE TRANSCEIVER BATTERIES in used unknown condition type Motorola NLN 58608 Ph volt (o• 75p 10 tor £6 50 H.F. ABSORPTION WAVEMETER. 1.5-30 MHz, £39.50 ex stock.

(pp £2) Type NL N 41636 15 volt 75p 10 tot SOi pp £21 NUT FIXING FEED • THROW SOO volt 1000m. MULTIFILTER. The most versatile audio filter. BANDPASS Hi Pass, Lo 4700PI both 55p each RACAL FREQUENCY COUNTERS type 9911 with handbook ii, £86 (pp £3) SEMCO RF Pass and two notches. Frequency and Bandwidth adjustable 2.5 kHz-20 CAPACITORS 350VW 22Pt .220PI. 300PI. 400171. all at 30p each CRYSTAL FILTERS 1 4MEie BW 2 4Ktu tIpper Hz, £75.00 ex stock. ,ind Lower Sideband £11 95 a pair PYE WESTMINSTER 10 CHANNNEL WISE tA TRANSCEIVER 79 to 110MPI HIGH PASS FILTER/BRAID BREAKER. Cures T.V.I.. £7.50 ex stock. (15.0411pp £3) STORNO BOOT MOUNT 10 CHANNEL FM TRANSCEIVER no accessories e £8 (pp £3) EX. CO-AX SWITC;1. Three-way , earth position D.C.-150 MHz. 1kW, MILITARY COMMUNICATION RECEIVER TYPE R110 2 to 16MHz ai 7 switched bands with 140 Noise Limiter. CW hile 10.100Khz Crystal Calibrator Aerial Inputs Dipole long Wire or Whip with loudspeaker and 240volt AC £29.50 ex stock Power Pack and Pair ot Headphones iv £79.80 (call f8) EX-MILITARY RECEIVER RZIO in unconverted 12 MONTHS COMPLETE GUARANTEE INCLUDING TRANSISTORS condition (it) £50 (carr £61 X RAND GUN DIODES oo £1 65. X Band Diodes like I N23 oe 45p. S1M2 e 45p,. Prices include VAT and delivery. C.W.O. or phone your CREDITCARD 15015 (it, £1 65 NO. Ring or write for further data or catalogue. Orders or information requests can be pul on our Ansaphone at cheap rate limes. Remember ACCESS ANO BARCLAY CARDS ACCEPTED. we are as near as your 'phone or post box. P.P. 60p UNOEFI £5.00 OVER FREE, UNLESS STATED OTHERWISE. C.M. HOWES AND 01000 ANO DOUGLAS KITS AVAILABLE BY POST FOR CALLERS. SEE US AT LEICESTER I STANDSALES HALL36 IN THE a SEE YOU THERE ,

BEARCAT 200XLT ICOM IC-3210 YAESU FT-747GX

Save money when you buy this top-of-the range scanner. 200 memories, coverage from 66-956 MHz, priority channel monitor, channel lock- out delay and auto AM/ FM switching go to ICOM's popular dual bander, 25 watts on both make a great package bands, great looking and readable display, full HF all mode 100W transceiver, 0.1-30MHz, and we add further value duplex capability, 40 memories and input moni- with the exclusive Raycom mod improving still. tor for instant repeater check. All you need add receiver dynamic range by 15-20 dB. Turns a Choose either a free broadband mag-mount or is an antenna and we have taken care of that. good receiver into a great receiver. Ideal as a a free mast-mount SkyScan scanner antenna base and particularly suited for mobile/marine worth £14.95 and a free cigar adapter kit when Regular retail prices: you order your Bearcat (and £30 off RR P!) IC-3210 £499.00 use with irs light weight and dick-stop dial. Broadband mag-mount antenna £14.95 Save money with the RAYCOM STARTER £229.99 .. save £49.45 , Total regular price £513.95 PACK - it's unbeatable value - just look! Raycom package price £479.00 Regular retail prices: FT-747GX £659.00 COBRA SR-925 SAVE £35! Raycom RX mod £59.00 20 Amp PSU £129.99 Raycom Credit Card is available on this pack, G5RV Y2-sized antenna £14,95 just £48 deposit and monthly payments of just Fist mic £21.00 £18! Why wait, send for written details now! Total regular price £883.94 Raycom package price £749.00 ICOM IC-725 SAVE £135! With coverage from 29-512MHz (with gaps). Raycom Credit Card is available on this pack. 16 memory channels, 2-speed search, high just £77 deposit and monthly payments of just sensitivity (0.3 mV) and 1 watt of audio this £28! Why wait, send for written details now! scanner is ideal for beginner and enthusiast alike! Raycom adds £30 worth of free antenna, cable, plugs and sockets anddrops the price to YAESU FT-470 bring a blistering scanner package to our cus- tomers. Call now for an information leaflet! Yaesu's new dual bander ICOM's latest addition to the family, the 725 is ex-stock at last and ,£159.99 .. save £30.00 gives a full 100 watts of multi-mode power and packed with features - is the second rig to use the DDS (Direct Digital dual display, dual band Synthesizer) system. 10 Hz steps for smooth monitor, 4 VFO's and 42 ICOM IC-R7000 tuning, all mode squelch, 26 memories, and memories, power saver, many other features make the 725 the starter auto power off, CTCSS, rig for those who want more than a starter rig - DTMF autodial and a wide it's unbeatable value • just look! range of options - SAE for Regular retail prices: information sheet. Regular retail prices: IC-725 £759.00 FT-470 £389.00 FM TX/RX (AM RX) board £40.00 FNB-10 nicad 7.2v, 600mAH 20 Amp PSU £129.99 £34.50 Wall charger £17.71 G5RV V2-sized antenna £14.95 Soft carry case £10.58 An unbeatable offer from Raycom - £30 off the Fist mic £21.00 Broadband nag-mount antenna £14.95 retail price and a free Bearcat handy scanner Total regular price £964.94 Total regular price £466.74 covering 29-512MHz (with gaps) worth £99.95 Raycom package price £849.00 Raycom package price £425.00 - a total saving of an incredible £129.95! Can't believe it? Send SAE for an information leaflet SAVE L116! and offer details. Raycom Credit Card is avail- SAVE £42! able - just £96 deposit and £36 per month! Raycom Credit Card is available on this pack, Raycom Credit Card is available on this pack, just £85 deposit and monthly payments of just just £45 deposit and monthly payments of just , £959.00 .. save £130.00 , £32! Why wait, send for written details now! £16! Why wait, send for written details now!

RAYCOM COMMUNICATIONS SYSTEMS LIMITED, INTERNATIONAL HOUSE, 963 WOLVERHAMPTON RD, OLDBURY, WEST MIDLANDS 1359 4RJ. TEL 02I•5SS-6767, Fax D21.544.7124, Telex 33E483 IDENTI G.

RAYCOM gives you more BUYING POWER TEL: 021-544-6767 AL L MAJOR CREDIT CARDSACCEPTED. BC, PHONE BEFORE IPM FOR NEXT DAY ACCESS.£ DINERS. INSTANT CREDIT UP TO DE UVERY BY COURIER (CI 5.00) • OR 2PM R AY C O M 1000 (SUBJECT TO STATUS) WITH FOR DELIVERY BY POST (C10.00 P&P). RAYCOM CREDIT CARD (APR 32.9/14 ). FREE PLEASE ALLOW TIME FOR CHEQUES TO COMMUNICATIONS SYSTEMS LIMITED CREDIT ON CERTAIN ITEMS AT kIRP. CALL CLEAR. MANY OTHER ITEIAS IN STOCK NOW FOR MORE DETAILS. PLEASE CALI. FOR MORE INFO AND FOR EXTRA SPECIAL DEALS) ORDERING INFORMATION INFOLINE 0836771500 5.9pm (weekdays) WE STOCK ICOM, YAESU, BEARCAT, MFJ, BUTTERNUT. CUSHCRAFT, AEA. TONNA, OPENING HOURS 9-5.30 MON TO SAT. WIC°. TEN•TEC AND WELZ AMONG LATE NIGHT FRIDAY TIL 7 PM. 73 DE RAY MANY OTHERS CALL FOR FULL LIST. W all, JIM G921AP AND JULIAN. r i E" PACKET RADIO 679.4 GR. GN. 'Electronic FRO M THE SPECIALISTS! Siskin Efraranics hare a policy of supplying the hest range of packet radia equipment available for the radio enthusiast. We hare examined Professionally designed equipment for Amateurs the products of many nutnufacturers and are pleased ta he able ta offer what must he Ilu• wirleAt range (el cgril 'mien! available f mili just one UK supplier. All pr« cs include l'AT and are valid at time of pubfiralion. N E W l'ACCO M M 'KE1 AU:ES:ROUES IINY 2 rarth PSIS L I I VIII ;2 is, ic rant £15119.

776C• 320 dual non In Stock' L I 79 161 Hie- MICRO RS.123 leaf. ... C795 For Leicester Rally 27/28th Oct PC•32041..it pnri 1°C caht L 159.110 PC RS232 lead 0.93 MICROPO WER.2 L I 49.011 ATARI ST RS232 lead £9,9S By Popular Request Real Tune don lept,ou 1:27.'15 Custom nude KS232 leads from £9.95

Wail!mud adaptor 195.00 4 w ay RS212 ,t% igeht eN £24 95 SPECTRU M •1NK INC interface .L1-15i5 NEW 2/10 M 25W %EA A MSTRAD -lblihraibl2K or

M Y); Budget 1-75C ...... f.1 27 95 ti25t5/85119312 RS232 dr...09.95 TRANSVEFtTER £189 + £4 P&P t2 Iscr4 sOIling malinnoile CIK9.95 CIRCII 9(411/ baud tor hlein 05.011 M mter Packet Reim 208 pager.I C9-95 All our transverters meet the same high specification I.: A NTRONIUS Digital Comm, kid, I lam radio £195 KPC211113' I II. ib Vide% £ 159011 SECOND HARMONIC: <-70dB KPC4 II dual pod £223.1111 TRANSCEIVF:ItSiRECF:IVERS SPURII: <-60dB KA M allmostr with .f21.5.011 1.1F.7.25 Gen. Coverage Receiver.. 1.395.111) ''Smarboulat • • Kittery tuckup £17.93 Naviro AMR IMO Trabcciter... (247.181 INTERMOD: <-32dB - Sniininatch" real meeker& £27.95 Navic.0 ANIR inreS Transeeiter. 6.19v.exi NOISE FIGURE: <2.5dB All 3..ivsen radlos supplted by us ushtly. I %IFS 1 NC connecung lead. NE W LO W NOISE GaAsFET MASTHEAD PRE-AMPS \t. 0.1 I I'MS Ills ThIC.21KV22(./. ;2./on-t. ;4113SX and AKA 1%60) 12.50 SOFT WARE Wacker & FAX only) For 70Mhz, 144Mhz, 432Mhz, 934Mhz, KA M/KPC4 2.N5 UK £131X1 Wc supply suitable sofmare fur moisi 200W power handling £99 + £4 P&P KIS72/KIS7241KI2.1I5 UK...... all computer. BEE of chase with all INC put. AEA PKI4S t I bill Slay 11/59 UK J f. HO W chases. Plume for ermunereialsist Plus our full range of Transverters AEA PX232 r3Ittli Dix I Mot K. £15 re 28/50Mhz, 144/50Mhz, 145/70Mhz, 28/70Mhz. NOTE: All our units have CIF !dent to comply with UK regulations. See us on Stand 58 Main Hall *** NEW PACCOM M TNC-320 in stock! ** VISA

37 Long Ridings Ave, Hutton, Brentwood, Siskin Electronics Ltd STAND 44 2 South Street. Leicesler ARS Essex CM13 1 EE. Tel: 0277 214406 (Sales Hall) Hythe. Southampton. All prices include VAT SO4 6EB. Tel: 9703-207155 I;AX: 0703-84773.i

ANTENNES TONNA (F9FT) THE VHF/UHF ANTENNA SPECIALIST SERVICE MANUALS SOMHa 149/435 M Hz POWER SPUTTERS 5 element £50.711a1 9819 element Oscar C61.07(a) 2 way 144MHz (49.36(6) Most available for Amateur Radio. Military Surplus. PMR, Test Equipment, 144MHz 1250MHz 4 way ma/4Hz £57.5310) Vintage Valve. Colour TV, Mono TV, Video Recorders etc. etc. 4 eternem £29.39(e) 23 element £32.291b) 2 way 435MHz C45.69(c) Over 100.000 stocked. LSAE Enquiries with Make/Model wanted. 4 element crossed f37.26lal 4s23 ele - slacking frame - 4 way 43561Hz . t5S.36 9 element Med.. C33.12(e) power splitter £175.00(a) 2 way 1250MHz (33.36(e) FREE catalogue Unique Repair and Data Guides for large SAE. 9 element portable £351610) 1296MHz 4 way 1250MHz C43.36(0) 9 element crossed C62.10(a) 23 element C32.29(6) 2 way 1296M111 C38.35(c) MAURITRON (RC), 13 element (49.061.) M23 ele - slacking frame - a way 1296MHz t43.36(e) 8 Cherry Tree Road. Chinnor, Oxfordshire OX9 40Y (66.24(a) power spinier (175.00(1) 2 way 2300MHz C38.35(c) t7 element Telephone Maurice Small GOHJC on (0844) 51694 anytime. 435MHz 55 element t49.27(a) 4 way 2300MHz (43.36(e) 9 element (30.43(a) 4,55 ele - siaclong Name - ANDREW HELIAX 9 element t36.64(e) power splitter (250.00(a) LOF4.50A £4.70/in 19 element crossed £421411) 2300MHz Connectois . ...(15.110(e) 21 element 43261Hz C47.61(a) 25 element (43.47(6) TELESCOPIC MASTS - STAOHNG 2t element ATV £47,61(0) FRAMES - COAXIAL CABLE - ANTENNA NOISE BRIDGE aorarons ETC All prices include VAT. Please add carriage (a) moo (b) £2 20 (c) Cl 20. U.K. MAINLAND Save TIME and MONEY, measure antenna RESONANCE 1- ONLY ACCESS or VISA cardholders telephone your order for immediate dispatch. Callers 160MHz and RADIATION RESISTANCE 2-1000ohms, find welcome, but by telephone appointment only. please Send 50p lor our catalogue which where it is 50ohms - without transmitting, get M ORE DX, fun- contains the lull specifications. o to-build kit, all parts, postage. etc only £27.90 and details of RAN DAM ELECTRONICS (R) SOLE U.K. DISTRIBUTOR other kits. FREEPOST, ABINGDON, OXON, OX14 11311. Tel: (0235) 23080 (24firs) CAMBRIDGE KITS 45 (RX) Old School Lane, Milton, Cambridge

HATELY ANTENNA TECHNOLOGY GM3HAT WANTED I 1 Kenfield Place, Aberdeen AB1 7UW, Scotland. TELEPHONE: Evenings 6.30-9.30 (0224) 316004

TWO NE W MONOBAND ANTENNAS BASE STATION MEDIUM POWER VERSIONS FOR WARC PHONE BANDS

11P 0014 18 r.a. EIS MP 001 24 v.,: Ill

.1/US Al HIE SCOTTISH AMATEUR RADIO CONVENTION. GUNROIRES Samna', 16th Seater-0e We rirait ee eon.; ENGINEER time antennas as hell as the CROSSED FIELD ANTENNA

unarm sent the techmal name tot the *POLL OP TIELIMIT we ohm aSked nudism Me Cape«. Dale wien wattle mitre ol these patented antennas gm, Mich we have ball cs, £15K per annum + Car • ,q..1.1bon Mee last sa yeas The Prune Releence are • -14silhban Drink ard Game Plane Animus by MC timely. IF I' Cent tin 245pp 102.1060.0,m la Me IEE Inktrubmal Contemner on HE Cœmmnicalem System Teetenues. Feb 19851 A r... Comprome Miteand. Low VSIAIR Dipole by 61.13HAT /11 HAM RADIOIUSA I May 1987 pp 69.78 in ttese papers 1,5 made Phone now that lie capacitor beat not only ems DALANCE Sul 0150retoperty matehm. :te 50 elm tome on Me CO. in lire rtia. yluantn ezninie en in wire al Ile Zail .1921V OP* Many anilines meek saw tile emended lash-man. to me ol Week penned as a tetra to the idle*? Practical Wireless emu « kw 1909 pan 13 Imams D3N9. h. are plewnr/ _g 01-573 7337 e..royoslao.l,omicO TECHNICAL DATA and PRICE LISTS ar test Class Sumps or Three IRC s UTO Proprietor: Maurice C Hately. M Sc FIEE Chartered Electrical Engineer

90 RADIO COMMUNICATION October 1989 USED AMATEUR EQUIPMENT? I Buy, Sell & Exchange WANTED - Your TOP QUALITY USED EQUIPMENT! We pay best prices for all types of used amateur radio equipment. Is YOUR gear for sale? Is it in top condition? Why not give us a call? If our offer isn't up to your expectation, why not join the growing ranks of amateurs selling their gear through our `RIGSEARCH' service? By the time you read this, our new showroom will be open, where we can display your rig until sold, or alternatively you hang on to it until we find a suitable buyer. This service costs you nothing. your gear is offered to every prospective purchaser that calls, and we achieve the price YOU require. All with least hassle for you. Why not give us a try! DON'T FORGET - IF YOU'RE SELLING, IT'S G4TNY and RIGSEARCH! BUYING - If you're looking for quality used amateur equipment, it has to be G4TNY. We have a large stock of used equipment ourselves, but. if we don't have what you're looking for, our new amateur radio brokerage RIGSEARCH possibly will. Phone or write with your Requirements, here or on RIGSEARCH! We can always help you buy, or sell your used equipment! Why not visit our new showroom? Only 5 mins from Dartford Tunnel & M25. Much equipment now on display. Do please call before setting out on a long journey though, as I'm still a one mand band! (For that personal touch!) And may be out! Phone Dave, G4TNY on (0708) 862841 or (0836) 201530. From 9.30 am to 7 pm, Tues to Sat. SAE PLEASE FOR LISTS. CALLERS BY APPOINTMENT, PLEASE. VISA

MAIL ORDER? G4TNY AMATEUR RADIO PART OVERNIGHT DELIVERY UNIT 14, THURROCK COMMERCIAL CENTRE, JULIET WAY, EXCHANGE NOW AVAILABLE! SOUTH OCKENDON, ESSEX RM15 4YG. POSSIBLE BE CONVERTED! 2-WAY RADIO SURPLUS 2-WAY RADIO CONVERSION HANDBOOK Chris Lorek CONVERSION As 2-way radio equipment, as used by the police, ambulances etc, is HANDBOOK replaced, these sets become available on the surplus market for very economic prices and they can often outperform purpose-designed amateur radio equipment! In this book, Chris Lorek explains how to modify them to amateur radio frequencies. He describes the equipment suitable for conversion, together with relevant photographs and sources of supply, gives alignment and modification details and covers virtually every variety of surplus Pye equipment suitable for modification. es This is the reference and handbook that amateur radio eole 00 operators have been waiting for. 00 «s ISBN 0 85242 946 0 Price £10.95I el' ......

234 X 156mm 224 Pages 40 a 15,v- te. •• \cis' .• • Illustrated Publication August 1989 ...e• s, fe, ..••-• .0 ,e›, d \‘',1%•'

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c e- 0 0." s e P 202•1 . pc» ce\e oe e 2e te-49 e ç.\-- . • •sf,-Çee` a ceel - ?se' I4 AO e e e ce ee • Ate çe • • o we %De eçe fee- .••• dote a vs. etee 5‘ ,:e ee.••• eess•". eeee et>elie 6166,elee.0 ek% GlOFK G2BAR Radio Communications 557732 Amateur F.H.B. Marion The 'CHIP' SHOP (Semicons) Ltd You need ICs for projects! Shop at the HAM RADIO SUPPLIES + TEN-TEC + YAESU 'CHIP' SHOP for the best service in the business.

• • lc' 1C25 NE602 £2.84 - NE604 £6.87 - SL6270 £3.50 - TDA7000 £4.00 - MC3356 £4.75 - TL084 £1.03 - MV209 £1.64 - V30 CPU £10.50 - V20 CPU £10.50 - 7911 £12.75 MAX232 £5.36 and 3SK88 £0.40 (YES! 40 pence) while stocks last. Full range of TTL inc CMOS, Timers. LED's, Xtal's etc. The New OMNI America's Best Just Got Better! Stock S9 e++ and T9X - So send a 19p stamp for list NOW IN STOCK - Mail order or callers by appointment PLEASE CALL FOR DEMONSTRATION Ell Roger G8ILD Tel: 061 483 1989 Chris XYL VISA 6 Bean Leach Drive - Offerton - Stockport - Cheshire SK2 51-17 CONTINENTAL SERVICE FOR EEC COUNTRIES Cushcratt THE G5RV 2 Element Beams ORP KITS AT ORP PRICES! 15.353 3 Element kt. (79100 DIPOLE 20 ems £4.95 PAP 300 ni 735335 2 RITIS £925 R e 300 a31 Element %caner etjr11 4 fn 193CD 3 Ekkoent lOnt Monainancct 0115.00 1/2 SIZE tts £12.95 F8F 300 6 fie, t14.95£ RIF 350 AN 80m CW ORP TX/RX t3-3CD 3 Etemee %Set Monceanor f139.70 £2391 1 40-10 MIRS 10 ""'' £39.95 P&P 4 00 203C0 3 Etterent 20m Moneoamet KIT FOR £76.25! Butternut £14.50 HF6VX 6 Band Veritcal Antenna £159.00 + £2.50 PAP Antenna Rotators * Ready Built - £126.50 F1F2V 60510 motor Veskoal £112.00 G-400HC £169.00 A 182HE6V 17112m Add on 6,1 * Complete in detail! £30-38 FULL SIZE = fr219.00£149.00 EVERY 20MRK HF2V 20m Ka £33 '38 80-10 MTRS G' 60 ORC £219.00 * VEO, AF Filter, Sidetone etc! MFJ 9628 1 5 kW Voisalunor £241.00 0.2000 0445.000 A1FJ 9490 300W Vernatunor £157.00 £16.50 G-400 £149.95 * Fully Detailed Manual! MFJ 300 Wall Beano MU £105.00 + £2.50 PAP 0.500 £149.95 MFJ 1601 Random Woo Tune £42.00 Other Super Kits include: MFJ300 wall dummy lOad £28.35 ZL SPECIAL 12e1 £38.00 pap £3 50 3 BAND RECEIVER, ATU's, AUDIO FILTER etc etc ... all 'well styled' and 151FJRF None Budge 063.10 2M lei £14.50 pap £3.00 FJEJ 815 2KW (toss needle SWFUPower ANTENNAS 5e1 £10.50 pap £3.00 complete! meter 57.32 For full details of the DTR3 and the rest of our range. INC send a SAE to: GAMMA MATCHED 10 MTR £95.00 VAT 15 MTR £125.00 AND LAKE ELECTRONICS, 7 MIDDLETON CLOSE, 3 ELEMENT HF YAGIS CARRIAGE 20 MTR £155 00 NUTHALL, NOTTINGHA M NG16 1BX. TEL: (0272) 557732 12-14 PENNYWELL RD, BRISTOL BS5 OTJ Or ring Alan GADVW on (0502) 382509 (callers by appointment only).

BLUE collette ROSE UNIT 1A ELECTRONICS SMD's (47111.1, SURFACE MOUNT CANAL VIEW IND. EST. SOT 23 base DEE COMM BRETTELL LANE DEVICES BRIERLEY HILL Full range SMD R's. C's, Transistors and IC's AMATEUR RADIO SMD 'Starter Kit' a 0.5W AF Amp for ORP Rs. OP. £6.80. WEST MIDLANDS PRODUCTS SMD Assembly Jig £15.50. A 15 page catalogue £1.00 from: DY5 3LQ. M E, 538, Liverpool Rd, Great Sankey, Warrington WA5 3LU SPECIALIST AERIAL MANUFACTURERS Mail Order. Callers by app. Tel: 0925 72 7848 AMATEUR AND PMR A SMALL SELECTION OF OUR AERIALS PROCO M M (UK) Cash paid for used Amateur Equipment. Part exchange welcome 3 Element H.F. Monoband Vagis SAE for stock list 10 Mtr £85 15 Mir £115 20 Mtr £145 G5RV fullsize £16.25 haltsize £14.25 P&P AT COST 9am-9pm. Mon -Sat. 0235 32653. 0860 593052. Callers by appointment please: 102 Larkhill Rd, Abingdon, Oxon. 2 Mtr Vagis 5LY £17.95 5XY £29.95 PLEASE PHONE 8LY £24.94 8XY £37.95 4 Mtr Beams 3 Ele £25 5 Ele £35 FOR DETAILS CASH CASH CASH - CASH 6 Mtr Beams 3 Ele £29 5 Ele £39 1000W Int dum my load £45 20 Ft Masts 3 section 1.5" x 10g £30 2" X 1 Og £60 2 Mtr Colinear 4.5 Dbd £36 We also stock HB9CV's. ZL Specials, Slim Jim's 2 Mtr & 6 Mtr Halo's, trap dipole kits, SWL aerials Jaybeam and ATU's, discones, traps, baluns, copper wire, ANTENNAS insulators, dipole centres, rope. spreaders. Winches 400lb £12.95 800lb £16.95 1000lb £19.95 From a simple ground plane to a 48 element parabeam, we can supply the lot! Tribanders, duobanders, beams for 6m. 4m. 2m 1200lb £22.95 1400lb £24.95. and 70cm, 23cm and mobiles. Plus rotators, coax, masts and Wall brackets, fixing bolts, u bolts and mast clamps guy rings, accessories. Mail order available. Callers welcome at Nor- thimbles, turnbuckles and rope grips and large range ot thampton's sole Jaybeam agents. Local installation service tuning caps & roller coasters etc. As you can see all our products are too numerous to mention. available. Send £1 refundable against any purchase for our full Call John or Dave G1RVX for advice and our catalogue and price list. brochures on TEL: 0384 480565 Visa and Access 0604 37769 TRADE ENQUIRIES WELCOME 52 St. Andrews Street, Northampton. MASTERS (Next lo Norlhbucks Home 8. Garden Cenlre) SEE YOU AT YOUR LOCAL RALLY

92 RADIO COMMUNICATION October 1989 O U T NO W! T X-3 The Ne w TIC FITTY/CVEASCII TRANSCEIVE M agazine for Split-screen, type-ahead operation, receive screen vintage radio INCORPOFtATtNG THE RADIOPHIL E unwrap, 24 large memories, clock, review store, callsign enthusiasts capture, RTTY auto CR/LF. CW software filtering and @ Whether your interest is in domestic radio and TV or in amateur much more. Needs interface or T.U. radio. in military, aviation or marine com munications, or in com mercial systems fixed or mobile. RADIO BYGONES is the magazine for you. BBC-B/Master and CBM64 tape £20, disc £22. Covering developments from the days ol Hertz, Maxwell and Marconi SPECTRUM tape £35, + 3 disc £37 inc. adaptor board to what was state-of-the-art just a few short years ago. Articles on restoration and repair, history, reminiscences and just plain nostalgia (needs interfacefT.U. also). — you'll find them all. Plus features on museums and private For VIC20 we have our RTTY/CW transceive program. collections with colour pictures of some of their most interesting exhibits Tape £20. • RADIO BYGONES, which incorporates Chas Miller's popular R X-4 magazine for domestic radio enthusiasts The Rachophile, will be published six limes a year. The first issue has just been published. RTTY/CW1SSTV/AMTOR RECEIVE Subscriptions to RADIO BYGONES, price £12.00 for one year by post This is still a best-selling program and it's easy to see why. to UK addresses (£13.00 to overseas addresses by surface mail), are available from the Publishers at the address below. Copies will also be Superb performance on 4 modes, switch modes at a on sale at selected museums and specialist outlets price £2.20 each. keypress to catch all the action. Text and picture store with IN You can obtain a sample copy of the first issue of RADIO BYGONES by sending your name and address, together with a cheque or postal dump to screen, printer or tape/disc. An essential piece of order for £2.00 including postage (cr £2.20 for overseas addresses) to software for trawling the bands. Needs interface. BBC- the Publishers: GC Arnold Partners. 8A Corle View Road. Corte Mullen. Wimborne. Dorset BH21 3LZ. Overseas payments must be in B/Master, CBM64 tape £25, disc £27. VIC20 tape £25. Sterling SPECTRUM tape £40, + 3 disc £42 inc. adaptor board (needs interface also). The SPECTRUM software-only version (input to EAR socket) is still available £25, + 3 disc G4ZPY PADDLE KEYS £27. Britain's first G OL D PLATE D Morse Keys displayed TIF1 INTERFACE Perfect for TX3 and RX4, it has 2-stage AT BISHOP AUCKLAND & LEICESTER RTTY and CW filters and computer noise reduction for Send for our Colour Illustrated Brochure excellent reception. Transmit outputs for MIC. PTT and 4,/," x 61/4" SAE to: 41 Mill Da m Lane, Burscough, KEY. Kit £20 (assembled PCB+cables, connectors) or Ormskirk, Lancs L40 7TG. Phone No. 0704 894299. ready-made £40, boxed with all connections. Extra MIC leads for extra rigs £3 each. State rig(s). Interface only • MANUFACTURERS SURPLUS STOCKS available with TX-3 or RX-4 Software.

Electronic Co mponents, Test Gear. Radiotelephones. Co mputers. BBC LOCATOR with UK, Europe, World maps £10, Photographic and Video Equipment. All at knockout prices_ MORSE TUTOR £6, LOGBOOK £8, LOCATOR £7, RAE Export and Trade Enquiries welco me. Catalogues available from: MATHS £9 for BBC, Spectrum, CBM64, VIC20, Electron. B. Bamber Electronics, 5 Station Road, Littleport, Ca mbs. All BBC and CBM64 programs are available on DISC at Phone: Ely: (0353) 860185 £2 extra. NE W!!

V AL VE S V AL VE S V AL VE S RX-8 FOR THE BBC COMPUTER

The following valves in matched pairs 6JS6iC. 6K06. 6JB6., A. 6L06. 6HF5. 6146.A. FAX, HF and VHF PACKET, Colour SSTV, RTTY, CW, 6146E. YES the 6JS6/C is Japanese and works in the FT101 Most amateur radio valves including difficult to obtain types EX STOCK. Quotations without obligation. If we don't AMTOR, UOSAT, ASCII. stock your type we may be able to import for you. PLEASE ENQUIRE. REMEMBER over 200 Pees EX STOCK. Sae for list. 'Phone for assistance re types suitable for your equipment. Receive them all with every possible feature and superb USA and Jai, manufacture of popular types available. performance. Full printer and disc support. The best D O N'T DELAY 'PH O NE TO DAY 045 75 6114, G4AZ M Wilson, Peel Cottage, Lees Road, Mossley, Lancs OL5 OPG receive system ever. Complete system of EPROM, interface, instructions,

1- T L— J all leads and demo cassette £259. Send for our Units 3 and 4, Thornham Hall, brochure on this amazing product. Thornham Magna. Eye, Sullolk IP23 8HA — LCOMMU7VICATIONS Tel: 0379 838333 PEP BOARD. Converts any RF power meter to read pep. /YE UHF EUROPA 420-470MIlt 3 or 6 channels choice o! 5 030 EACH • £3 p•p PIE OLYMPIC high band AM. 160-liAMHz, choice of 25 020 • f3 P•P Assembled and tested PCB, + mounting kit and full PIE BASE 414.412 UHF. 450.4701,114/. choice of 33 030 • f/ P•P PIE 130 BASE TX Rs Not, band FM 150.170.111:. choice ol 7 £25 EACH • f 10 P•7 instructions. £12. PIE 130 BASE TX • RS 11g0 hand AM. 150-114MHz. choice al 62 025 EACH • Ell) P•P PIE 130 BASE IX • RE 10m band AM. 70-90/aHr. chace re 3 125 EACH •£ 10 P•P Prices include VAT and P&P, 1st Class inland, airmail PIE 130 UHF ix • RO 4204701.012. [hate 0169 f25 EACH • flO P.P PYE F9U UHF, 420-470MHz. choice 0112 020 EACH • 010 P.7 overseas, normally by return. Eire, C.I., BFPO deduct PIE 112 hand held UHF. 120-445MHz. choice pl 7 CrW Bau , 020 • 03 PF PIE PF2 111 hand held be. bard FM. choice of 5. CrW Balls 020 • 03 P•P 13%. PTA PF2 Fll low bang FM. choree 3 020 EACH • 03 P.P PTE PIS UHF. 440.466 MHz, choice 7 020 EACH • f3 P•P STORNO 600 1612 ex carotenes). high band FM. 159-165M11: E10 EACH • 03 P•P PPE WESIIIIINSTERS high W O AM. choice 014? 012 EACH • S3 P.P ITT SETS hie bye FM EIS EACH • 03 P•P BATTERY CHARGERS lot Motorola 111220 £15 EACH • 03 P•P technical software PUEPFI RX • TX £10 pa Nit • f3 P•P BATTERY CHARGERS for flO • E3 P•P. For PF 9 Efl EACH • £5 P•P FP, Skill ,' 8,..,(1 Sib EACH • E4 P•P Fran, Upper Llandwrog, Caernarfon 1154 7RF. PTE IMF SIGNAL GENERATOR type 50511 f20 EACH • £1 P•P MOTOROLA MAXAR UHF. 42.0.4E0MH: 030 EACH • 04 P•P VISA MOTOROLA HAND/HELD 81220, high bed FM £25 EACH • 53 P•P Tel: 0286 881886 tuieMatt $ C Needled Gale

RADIO COMMUNICATION October 1989 93 AIR-BAND. ICOM-1C-A20 transceiver. PMR. Only £299; MML-144/100 Linear; MML-144/50S; 432/144: 432/28; 144/28 Transverters; Eddystone EA12; 888; CLASSIFIED ADVERTISEMENTS Racal RA17; Yaesu FC102 - 1200W antenna tuner; 0-35MHz professional digital receivers £595; Heathkil transceivers; shortwave receivers from £40; Classified advertisements 40p per word (VAT included), minimum £6.40 manual service; Xtals - 10,000 in stock: S.S.B. products. 42. Halvarras Rd., Semi display 1/8 page 2/14 " x 3/12 " (57 x 91mm) £96.00 Playing Place Village, Truro. (0872) 862575. G3EK (SAE). 3/32 page 1%" x 3/12 " (42 x 91mm) £74.00 All • 15% VAI• VHF and UHF ANTENNAS:- Now available in the UK the lull range of OZ5HF 1/16 page 1" x 3/12 " (26 x 91mm) £52.00 Vagis based on the DLEWU design, for more information call Ar antennas 0403 - 55011. Please write clearly. No responsibility accepted for errors. Latest date for acceptance - 5 weeks before 1st of issue month. 1 COM-R 71E communications receiver, with FL-44A high grade SSB filter & All classified and semi-display advertisements MUST be prepaid. FM unit fitted, and ARA-30 active antenna. Only 18 months old. £625 ono. Copy and remittance to Victor Brand Associates Ltd., Phone Mike on 0572-812447. 'West Barn,' Low Common, PK-232, Advanced Electronic Applications Inc. dala terminal unit with PC- Bunwell, Norwich, Norfolk, NR16 1SY. PAKRATT & PC-FAX software on IBM-PC compatible 3/12 " disc. Only 18 Cheques should be made payable to RSGB. months old. £225 ono. Phone Mike on 0572-812447. Members' Ads must be sent to "Members' Ads," RSGB Hq. QSL CARDS designed personally for you, or one of our wide range of special pictorial designs in single or multi colours, raised print or normal print, super- gloss or matt board. For quality and value send L,S.A.E. for samples to: FOR SALE Contact Cards. 289 Church Street. Blackpool, FY1 3PE, Lancs. 3 NEW BANDS £19.501G3LLL W.A.R.C. Kit for FT191 Mkt - E £19.50p.p. Very DISPLAY YOUR OSL's. Plastic wallets, strips of ten, packet of sax. £2.80. easy to fit. - Also Double Balanced Mixer for quieter RX FT101 MK2 - E £19. Kayplas, 49 Headley Way. Headington, Oxford. FT101 MK1 £19.50 - PA valves FT101 MK1 - E & FT200 6JS6C NEC £38 pair p.p. 12BY7A NEC £22 p.p. - also 61468 selected (1000's of low output ones FOR SALE: choice of several TR7/R7/17 combinations. CLEARANCE SALE ol around) for FT101ZD, 902 etc. £33 pair p.p. G.E. 12BY7A £7 p.p. - 160 Kit for accessories for Yaesu FT101ZD/101/102/980/FT One equipment Please send KW & SEM Z-Match £6.50 p.p. - outputs for FT707 etc. Toshiba 2SC2290 £48 large SAE Plus £1 for complete list. Professional Communications Ltd. pair p.p. - Datong ASP auto RF Speech Processor wired FT707, 757, 747 etc Kilcolgan, Co Galway. Ireland. Phone: (010-353)-91-96091 'Fantastic £93 p.p. - FM units FT101ZD MK3 £45 p.p. 6/1 Epicyclip drives FT101 MK1 - E £4.25 p.p. - CW Filters FT101ZD. FT902, FT707, FT107, RSGB AMATEUR RADIO INSURANCE SCHEME FT102. state which, £40 p.p. - Black Star frequency counters (as used by G3LLL) 600 MHz £145 p.p., 2.4 GHZ £345 p.p. S.A.E. leaflet - ATu's by Toko, "ALL RISKS" INSURANCE for portable/mobile/base station amateur radio SEM. Nevada & MFJ - New & S.H. Yaesu P.X. & Commission Sales. J-Beam, and ancillary equipment. A service for RSGB members only. Also public Cushcraft. Butternut, G-Whip & SMC Antennas, Ten Tech, Corsair, Paragon, liability and equipment insurance for affiliated clubs and societies. Details and Super Rigs. Amtor & Packet? PK232 on DEM. Holdings Amateur Electronics, leaflets from Sarah Baylis or Jenny Lovell, Amateur Radio Insurance Services 45 Johnston Street. BLACKBURN, BB2 1EF. (0254 59595) Closed Thurs. Free Ltd, 4a Russell Hill Road. Purley, Surrey CR2 2LA. Tel 01-660 0820 or Fax: 01- parking. 15 mins from M6, Junc. 31. 660 9222. OSL CARDS printed to your own specification on white or coloured gloss card. Send SAE for sample pack to: The Caswell Press, 11 Barons Way. COMPUTER SOFTWARE HARDWARE Woodhatch, Reigate. Surrey. (073 72) 44916. AMIDON TOROIDAL CORES, ferrite rings for TVI filters, ferrite beads. Send SCOTLAND PACK-AGE! for AEA. Kantronics, PAC-Comm, WX Stations and SAE for data and prices. SMC (IMP Electronics), Unit 27, Pinfold Works. computers. Atari-ST, WE FAX software for KAM-£15 PACK-AGE, Braeside, Pinfold Lane, Buckley, Clwyd. Urquhart, Crossford, Fife KY12 80J (0383) 721169. AMSTRAD/IBM PC COMPATIBLE SOFTWARE. Large SAE to Charles Crane PERSONALISED OSL CARDS, 1000 £19.00: 5000 £60.00. 5000 gloss in two colours. £88.00. Send SAE for samples (DIY OSL's/SWL's -4 state which!! - G4YFN, 2 Pimento Drive, Earley RG6 2GZ. 100 mixed designs/colours. £2.50. C.W.O. 0/Cards. 89 Derwent Street. THE G4TYFLOG, date, band. power, mode. time, callsign, name, 0TH, RX/ Blackhill, Conseil OH8 8LT. TX/RPRT. find call. OSL/Log, directory load. auto save, own unique filing system, network facilities, formatter, logbook style and label printout, easy fill OSL CARDS. Try me for quality and price. SAE for samples. A. W. Bailey features, only four inputs, user friendly. Nice screen display. Includes tree (G3YNI). Breen Down Press. 78 Alfred Street, Weston-Super-Mare. Avon resister decoder, contest log. BBC. Commodore 64. Spectrum. £17. Updates. BS23 1PP. Price difference only, Enclose callsign. E. Aston, 64 Gurney Valley. Bishop G4T JB OSL CARDS printed to your specification, choose from 15 matt, 14 Auckland, DL14 8RW 0388-607500. gloss colours of card. DIY matt £2.75 (100) gloss £3.95 (100). Logbooks £2.50 G4UXD'S CELEBRATED MORSE TUTOR: BBC's, IBM-PC. compatibles. Bureau envelopes. morse oscillators, mobile antennas, Agents for Navico. Adjustable speed, delay, letter frequency, 100 tests, attach your key. 4-4+-44! 50MHz linear amps, Photo cards, power supplies, cavity wavemeters, 24v to 7.95 disc. SAE details/free trial! D. Brandon, 1 Woodlands Road. Chester CH4 12v converters. For samples and full product list SAE to 24 Portishead Road. 8LB. Worle, Weston-Super-Mare BS22 OUX. Tel: 0934-512757. COMPUTER REPAIRS & SALES, all popular makes including Acorn. "RAYNET" YELLO W REFLECTIVE TABARDS with "RAYNET" like Police, Amstrad. Commodore, Atari, Sinclair. Repairs from £16.00 including postage Ambulance. Medium £9.00. Large £9.50. XLarge £10.00. "RAYNET CON- and 3 months guarantee. Printer cables, floppy diskettes 5/14 " and 31/2 ", TROLLER" 50p extra. Nonreversible Battery Connectors (10 pairs/pack) printers, disk boxes, joysticks, etc. Please phone or send 9" x 6" SAE for latest £4.00. Mike Watson G8CPH, Ipswich, (0473) 831448. discount prices. Advance Electronics (NE) Ltd.. The Old Ropery, Deptford PUT TOP BAND into your FT707 or FT77 for just £29.95. One of the many kits Terrace, Sunderland_ SR4 6DD. Tel: 091 5108040. from KANGA PRODUCTS. Send LSASE for free catalogue. 3 Limes Road. A MORSE TUTOR in your pocket! The Kirsta Morse Tutor for the Psion Folkestone. 0303 276171. Organiser (any model) includes 50 plain language texts, groups. 5-40 wpm MOSLEY ANTENNAE - All the famous British Manufactured Antennae. with adjustable delay, single characters, adjustable character frequency, etc. direct from us including spares/replacements. Mustang, Elan, TA-33Jnr etc. Designed and written by John Morris. GM4ANB. £29.95 (including VAT & Full Details shown in our Handbook, price £1.25 refunded upon purchase of Postage) or SAE for details to Kirsta Products Ltd, Unit 1, Block 2, Victoria Antennae. Mosley Electronics, 196 Norwich Road, New Costessey, Norwich Industrial Estate, Airdrie. Scotland ML6 9BY. Tel (0236) 54626. Access & Visa NR5 OEX (Administrative address only). accepted. ANTI-TVI DIPOLES & TRAPS for DIY Tribander Beams, F7FE Multiband Dipoles. Aerial D.1.Y. Bits, Baluns, Data. 28pSAE. Aerial Guide £1.00 G2DYM. HOLIDAY ACCOMMODATION Uplowman, Devon, EX16 7PH (03986) 215. FLYING FROM GATWICK? Stay at Mill Lodge Guest House. 4 minutes from PROCOMM (UK) - Used amateur radio equipment bought for CASH, part airport. Transport available. Telephone (0293) 771170. exchange welcome. SAE for stock listing. 102 Larkhill Road. Abingdon. Oxfordshire. 0235-32653 or 0860-593052 (Callers by appointment). HOLIDAY IN CORNWALL? Stay at Clifton Farm. B & B, E.M. Six Berth REVIVE YOUR HAM SPIRIT. Try something new. DIY projects, loop antennae Caravan. Camping. All set in a very secluded location near Truro. (G4LJY) 0872 863849. etc. SAE details G2VF OTHR. NAVICO AMR1000 £227.30, AMR1000S £277 and all other Navico goods. ask GULF COAST, TAMPA. FLORIDA. Luxury bungalow, sleeps 6-8. close to all Florida's attractions. £250 per week. Phone Bob GOGHT on 040-928-475 for for list. MET antennas, Uniden scanners, Co-ax cables, plugs and connector further details. G4GKU Minibeam £79.98 4 £3 p&p. Marine radio telephones and antennas. BRIXHAM, SOUTH DEVON. Fantastic views and radio chat from the hotel that Send or phone for free list. Seaward Electronics, Lynstone Trading Estate. provides great accommodation and the famous WAB (Wireless at Brixham) Bude, Cornwall. Tel. 0288 55998 or after 6pm 0288 4892. courses. Phone for brochure Torhaven Hotel (GOJFM) 0803-882281 CALLSIGN BASEBALL CAPS. Blue, red or black with your callsign. Send BLACKPOOL BREAKS? Stay at New Osterley Hotel. Situated in the town £3.70 including p&p. Callsign Sweatshirts and T-Shirts. Send for details. Club ceryre close to the Tower and all amenities. All 85 bedrooms colour TV, enquiries welcome. M.J. Hilton, 3 Highlields, Heswall, Wirral L60 7TF. leamak.er. So.e,e suite. Use of the Eti..e.ck. (r..-10KJVI.- Telephone (0253) 22987 OSL CARDS. Gloss or tinted cards. SAE for samples to Twrog Press, Penybont, Gellilydan. Blaenau, Ffestiniog, Gwynedd LL41 4P. MISCELLANEOUS GW3C01 CARTOONS PERSONALISED FOR OSL'S, greeting cards etc from HEATHKIT UK spares and service centre. Cedar Electronics, Unit 12, Station £7.00. GW3C01, Penrhynbach, Abersoch. Gwynedd. Tel 2675. Drive, Bredon, Tewkesbury, Gloucestershire. Telephone (0684) 73127, POLYPROPYLENE GUYROPE. Don't waste money on small quantities. Buy a COURSE FOR CITY & GUILDS, Radio Amateurs Examination. Pass this 220 metre coil! 4m £15.00. 6mm £20.00. £8mm £28.00. Cheques - 'Rope-Link'. important examination and obtain your licence, with an RRC Home Study Cadence. Battle Road, Heath field, Sussex TN21 9DR. Course. For details of this and other courses (GCSE. Career and Professional examinations etc) write or phone - The Rapid Results College. Dept JT17. G4MH MINI BEAM for HF, still at £98 inc VAT. SAE details. Supplies of Tuition House, London SW19 4DS. Tel 01-947 7272 (9am-Spm) or use our 24hr Kenwood. Yaesu etc. Selection of used equipment. The Amateur Radio Shop, Recordacall service 01-946 1102 quoting JT17. 4 Cross Church St, Huddersfield, West Yorkshire. 0484 420774. VINTAGE WIRELESS BOOKS/MAGS wanted and for sale_ Send for lists - QSL CARDS, club stationery etc. Quality and best prices. SAE to John Shaw state requirements. Quilltech. 26 Woodside Road. Kingston-on-Thames, Printers, Barcroft Road, Cleethorpes, DN35 7BG. (0472) 343311. Surrey KT2 SAT.

94 RADIO COMMUNICATION October 1989 Members' Ads

Conditions of acceptance are published on the Members" Ad order form inserted into the wrapper with every issue of Radio Communication posted to members. This form must be used when placing an advertisement; and please note that FOR SALE, WANTED and EXCHANGE advertisements must not be mixed on the same form. A new, more flexible, pricing scheme has been introduced. Details are on the form. Each advertisement must be accompanied by the correct remittance, as a credit card payment, cheque or postal order made payable to the Radio Society of Great Britain. Please note that because this is a subsidised service to members, no correspondence can be entered into.

w Wee AC38M ATU. Partridge top-band ATU. roc: £40. 001IF OTHR. (Selby) 075782 415 loin. AO tOm dais, manual. ong.padeng: £100. MH1BB 160-10rn 100W/Out Both with manu- • YAESU FT708R 70cm kbeld ten with due 14AVO vert aenal 40-10m Good cond: £35. 3011 als. G2DYM trap ant. 12G5FIV Hy-gain 111AVO Eye cond £100. G IFW OTHR (Bristol) 0272 sectional wooden Joymast £30 Scopes Galway° trap vert. requires 2 shod lengths top-secten akr 674974 10MHz dual beam scope. £100. Buyer collects. FOR SALE min tubing and top-hat 70cm colour video station • YAESU F1747GX with me. Me al board. CW G3TJC OTHR. (Bradford) 0274 582781 .nc superb ITT camera. Prot tripod stand with filter, phones Swr bridge, mint cond. Ire carr • KEN WOOD 1-165 phones. Urwranled gilt £25. • HEAT HX.11 HW8 ORP tcvr some useful mods. bases. ITT III Spectra recorder plus separate "T" £550 John. Grimm OTHR. (Washington) 091 Kenya:led sew » spir £12. Harneg HA1207 £75ono. G3NTA1 OTHR Phone alter 630pm.. V programmer timer Separate ad.:Medal mains 416 2606 814itz scope rie adaptor for monitor scope. Any (Starnes) 0784 456567 eve unit charges balls for remote use. Carrymg e FT102 with me. FM-AM board, fitters. manuals: test: £75. Tandy digital clock 240V: £6. 8C221AK • FC700. mint. £76. Ci4SBZ OTHR (Louth) case for recorder 30t1 camera ext cable. £550 Spare set of 3 matched 614613 - £30. 2 driver manual PSU. Ong charts: £25. PSU for KW Vespa. 12B1r7A . £8. Post WW2 VHF/UHF hheld TX/I1X 050785 591 MAITVT435 transrrutter. 'MTV cvtr. mil. Multi- G3RHM OTHI3. (W London) 01-423 2329 • LOWE HF125 with NBFM detector option Mod beam 48e1e ant with AR40 rotator £1000 tot. Cash type 111159B. Gents sports 10-speed, little used. • SHIMIZU SS1056 HF TX.RX SSB/FM al opens Exc cond £290 Panasonic RFB501 travel pen- or dear cheques lust. Les. G3RCX OTHR £80 Collate Tin reel-to-reel tape deck: CIO Pad- Idled 15W. Superb hrst HF or mobile. £200. Hi-fi ded bags itien Oqy 300 - £20 (Trowbridge) 0225 spies good" £30. (Chesterfield) 0246 569527 able de meads. £45 Allan. ce.7.7y OTHR. lSouthendon-Sea) 0702 585929 (lbstock) 0530 61341 • SINCLAIR OE computer and terminal swam. 761819 • LATTICE lower. 34 12t1 Em sections. £60. Al • 2 No Cue 0oe 15ele ants tor sale 1 No boom £100exi. AOR2001 VHF scanner: £225 KPC2 • FOR collectors. Cosmos. Gecophone. Varley. longs rric. Jaybeam 8 over 8 beam: £15. (Hunger. drilled to sun Xr`f operabon. other never used In INC - £110 HP41CX calculator £125 12ch dal 111, Parrneko LFTs. L Fes Venable coupbng plug-in. lord) 0488112757 good cond £25ea Carrextra. 50 ohm note length controlled RX 2ch fitted: £40 All in good cond. All col holders. National Velvet slow motion dials • 45930S: £930. Ton -Toc Century 22 - £200. about 4.003m. Prefer use works number below. plus can. tarn GM1PSU. ¡Livingston) 0506 88309 1 Johnson ceramic UX TX valve, holders Weante Daiwa CNW419 ATLI - £100. Datong mono key- Nigel. 06400 OTHR. (Toro) 0872 79525 • KEN WOOD 464306 eel spa. PSU available it cod packs. Eddystone variable condensers. IFis. board: £30.1Cenwood LP Idler LF30A" £10. G4ZAU • 11F Meat. 4X611E5. 800W ropy' Pyramid bull reqd £625. Standard C500 dual-band hheld as etc Litherlard, GAIMT OTHR. (Chippenham) 0225 (0swestry) 0691 657696 from SSE) products kit 3 meters. tan, valves new new, sunk°. meads. case: £315 Altron surine 891254 • DRAKE T4XC, AC4. Ft4C. 3 beers. des WARC. MS-it. All FB - £550. G3GGK OTH R (Cambridge) Feb. £200. Buyer collects or cart at cost Short mast rotor cage. 9/post £300. Shure desk me: • HEWLETT Packard RMS voltmeter 3400A 2Hz- Wave Magazines. Dec 60 to Apr 70. C4fersG3UIM £15 Post extra G4YRR OTHR. (Stoke-on-Trent) 10mHz. ImV.300V in 12 ranges. manual. Otters 0954 210374 OTHR lExmouth) 0395 273090 0782 395017 Hitachi AMFA1 stereo row SR503L, veshop man- • FT77. no mods, never used mobile. As new, • MINOL TA XGZFI 7flolrkorblaclçnsnt ERC UV • AMT2 used 1 week only. with Eprorn he BBC. 1 ual- £30 Screened valve holders B7G base: 50p boxed. manual. MH1BB me: £400. GOIBUC OTHR. hood plus Verne macro zoom 28-200mm Mint am not good al typing' £2000ne (Pertstade) 0273. each 24V PCB mounting relays DPCO: 93p each (Torlisey. Lines) 042771 340 £150 Lens only £80 Also Dragon 32 BMK sware 418713 Pye Pocketphone PF2UB cases: £2 50 each. • FTONE Yaesu: £900. FI210013 linear amp: cartridge CVPRTTYAMTOR ASCil TNC in • 1S930.6 met cond. hardy used, boned. auto (Gush/rough) 02137 42536 £360 Tono MR150W 2m linear phe w- £100. eluded: £40ono Alter liars please. John AT U. Dewsbury FM board. last TX4IX for AMTO R • FT290ft complete in box. FRG7700 rcw vi box Multi 700EX 2m" FM . £120 Tau Sf'C ATU. £175. 1S.London( 01.857 8096 MC60 me. lechneal manual' £1250 Inc shipping FRT7700 tuner Me Mod 14141.144 ,100LS 100W. GP432X 70cmcobnear £23. FC902ATU: £100 All • FIVE volumes computercomm rosi books in UK. David, G3NHB OTHR (Cambodge) 0223 All VGC: £500 May split (Bolton) 0204 593484 In good cond. Full details Tony. G4VTC OTHR Davie output meter F1902 range DC/AC leads. 841304 eve • FT101ZD. W A/IC. manual. unboxed Good (Dorking) 0306 Ra5533 new. Uruden 2000 used AX only 2tirs 0 0473 • 16940 owners Interested 6m Have FTV 107R clean retie: £400. No oilers. Mr Dixon, G4IYK not • NORTH Leeds. Large detached house for sate 830147 Mr professionally modified recently by Lewes for OTHR. (Cambridge) 0223 860681 x4449 da 1089 4 beds. gas CH Very high location. over 50041. Nice • COMMODORE 64 computer and 1541 disk full competitor'. ty with 16940. Inc patch leads. Abso- • OAT sale FT767GX with 2m module: £1400 gardens, garage. carport This +s an original 1930s KW1000C amp with spare 572BU: £360. 4011 wall' large detached properly which now needs some drive. Lots of sMare .V suitable packet . £100ono. lutely mint cond. boxed with rnst £200 No otters G7D WX not OTHR. (Loughborough) 0509 235165 please. G2FZU OTHR (Southvmtl. Notts) 0636 mounted crank-up tower: £280 Electric winch: modernisation and improvements £130.000ono • YAES1J F 7290R VGC: £235. Marcum TF1301 D 813847 £225 KR600fiC rotator £120. TEO IVIk.3: £180 SAE to 34 Nursery Lane. Leeds. LS17 71-1M Hansen PEP meter. £60. SEN ATU with Ezitune: (Leeds) 0532 683884 eve £65. Wayne Kerr LCR bodge B521 - £35 64U1.11 • YAESU F1102 icw AM,FM. used AX only FC707 ATLI. MI and YM38 mies. SP102 spiv. 2m £95. Thandor free counter £65. Complete set Gittu • JAYBEAM 1133 compete: £140 Gem quad 2eie: OTHR. Eve. (Ashford) 0233 625030 • TFII0 1806. 100W HF tcvr WARC. many laces- and 70cm cers. £650. Swedish brass key £40 Spectrum programs CWSSIIRTTY £20. Spec- £100. 2711 ex-Army mast cw lutbag: £15 (35RV ties C O. nice cond £4500e0. Prefer buyer Brother HAS printer cm.. mains adaptor, unused trum 48k. not working: £10 TVI hirers mains Meg TAR full-size: £8. ZX Spectrum 48k boxed: £30 collecternspects Could arrange delivery. 'North. £60 GOEXL OTHR. (Colchester I 0296 382432. Co-ax cable. Many other items Buyer ol toweranl Tape recorder. tapes: £10. 13nN pod TV: £30 4011 ampton) 0604 862903 lb MINOLTA XC,2 SLR F1.7 Rokkor ERC filter to dismantle No bmewaster please. G4DXG Hornebrenv telescopic biting tower: £150 10m 3eie • FRG7 2m eve HX 8X digital riout: £135ono hood MI mint cond plus mint Vretar macro zoom OTHR (Tunbridge Webs) 0892 35830 alter yaw. (Yorkshire) 0422 51852 Kemsood 205 Mice, needs. mbracket. Heather- 28-200mm. As new. boxed. Both £150. Lens only. 6pm1089 • KEN WOOD 1119130 tow, hardly used All 510 Ile hut £165. GOIAX. ¡Cirencester) 0285 650656 £80. Also Dragon 32. BIM shree lite RTTY,CW., • MARCONI standard se gen type TF 8672. accs. but no manual hence: £310. G.Baradough. • 2M station FT29OR Mutek Ff. rends and chrgr ASCIPAMTOR with TNC Others around £45. Good cond, however needs one coil pack rebuild- CdDLT OTHR (VOmbome) 0202 695370 alter Mint cond 30W Mmodule linear amp, £270. Tony, John. 0 01-857 8096 afier 111089 ing Have details arid manual Range covers 941089 GOHTX not OTHR (London) 01 727 2246 • TRIO 9R590S gen coy rev.. inc matching spiv 15kos-440MHz. Built like a battleship and weighs a • FC102 ATU - £150 Available will, FAS14R re- lori. Needless to say valved, £15. Buyer collects mote ant selector fined in ATU or can be used • FRG?. exccond with manual - £110. G4DGB SP5DS VGC" £75ono G8UHT (Sancbacre 0270 OTHR. (Fareham. Hants) 0329 42010 761120 or 0270 1089 (Goodmayes) 01-599 6871 externally. £60. Both units VGC. G4U2K OTHR. • KW2000E last and best olsenes Recently seer • TEN- TEC Paragon with 1.8 and 05 biters tilted.. • FT200 ten, good cond with Hometwew second (Heeled) 0981 540817 iced, compete roc manual £200. OTHR 0 021-. plus FM board and desk nuc. £1550 owe Daiwa VFO 6146 PAs. RIT. AF filler £190. G3VVIOTHR • YAESU FT901DM al bands Mans and mobile 745 1000 304 metered PSU £140 M O2 cw Commodore /Farnham) 0252 722663 eve operation, manual and leads etc. VGC: £500. • YAESU FT726R with 702r6NF modules, sates 64 and swore. Alt you need to get going on • ICON IC740 with FM. PSU. electronic key. £550. Richard 811688C09. ISwinnon) 0793 823621 • DRAGON disk drive. single, and DOS: £11:0. lee unit CW Idler, desk mic, manuals. ong . packing . AMTOR RTTY etc All items we rn showroom Yaesu F427004111 FM len for 2m7Ocrn plus gutter Recent SA1C overhaul: £1000. GSM.) OTHR. cond Genuine reason for sale. K Baker. G4RPV mount ants. 71 for 2m. Mete 51 loe 70crn phis BMK packet program, cartridge, and modem: £50. IReadling) 0734 871200 OTHR During othoo hours leave message on hands tree me: £550 Yaesu FC9132 ATU: £150. Vanes.* computer are rade none Move laces • KW20008 PSU. Shure 201 me• £180. Linden 056482 2808 (Birmingham) 021-459 7041 alter Mulek 211,144 Mr: £180. Sofa 28/432 Mr. £193. sale. No room No reasonable otter refused. bin be 2830 10m USEILSEVFMAKI.C W. £200. Steve. 61089 Sola 144 ,1296 Mr- £100 New unused IOXY ant: reasonable SAE R. Woods, 7 Austen Avenue. G4YTK OTHR. (Cannock) 0543 78902 • FOR sate or exch. Com modore CI28 computer. £50 64H10 OTRA or packet via RP2 CD2 or SF2. Sawley. Long Eaton. NG10 3GG (1 0602 731036 • UL f IMAST 30111elescopec Mover cW ranch and disk dove, colour monitor, printer, al cables. (Mansfield) 0623 514974 • 23CM 10W station complete 2x015 ant inc ground post VGC: £145ono. Apple II disk drive boxes As new, Also toy/locks Expert cartridge • COLLINS 304.1 HF Mear. New PA valves. PSU phaseg harness. MMT 1296144 Mr. solid slate £25. 80ced card with fore disk: £25 Buyer inspect' games. W Pro etc Paper All mint cond For mod- return Exc cond Buyer collects' £500 Chis. amp PA23 I O. Bargain at. £355 ATV cvtr MMC435, collects or arranges carr G4GPY OTHR Ring eve em rcw Trio. Yaesu. loom etc Larkspur outfit GOEXD not OTHR (Heston) 051-336 1589 600: £20. 6m Mr Mulch TVVF50C 14460: £165, (Beverley) 0482 860440 complete. mint C11 TX R210 AX, mains PSU. • STANDARD C7800 70cm FM mobile. unused: Adnan, G4ROA OTHR. (Coverlet) 0203 412201 • TEKTRONIX 547 scope vnth lAt pluwin and inc ATU, cables. me. phones. turelion toners Manual. £180. Teac FD55G Hidens disk dove. unused: • KEN WOOD TS8306 and service manual. Also trolley stand Works hem need of a service. Any works ED: £200. Or with C128 outfit for better AX or £60. Panasonic 15in disk dove. unused: £45. 3x VF0240, both mmt in ong =tons: £780ono. oilers? Rather big so prote' buyer collects. TX/AX. (Mansfield. Notts) 0623 294/3 eve-we Claude Lyons mains stabilise 240V,124* £150. GW6RUO OTHR (Clwyd) 0352 781099 GAMMHE OTHR (Bo"ness) 0506 827228. • COMMODORE C64 computer. 1701 colour Toned 240V.19-0-19V I kVA: £35. Welter PU213 • CROTECH 3133 25MHz bandwidth scope, • SONY ICF2001 word radio with PSU. £95. Sony monrtor. Datasene recorder. ICS PakrattC.64 firm- iron and PSU: £35 Koss ESP9 electrostatic 3nteis old. Cost £385. WrIl accept any reasoned CDP101 CD player with remote but needs repair. ware, adaptor cattle and overlays All GWO. boxed phones with energiser: £50. HRO RA type dial, otter. GW4XLE OTHR. (Bridger-lo) 0656 740182 otherwise good cond. £95. Philips portable stereo with manuats First sensible after secures G3FZW ewe £25 Advance M65.10 SMPSU unused: £9. • TRIO TS830S HF tow E cc cono Very reliable, record player. GF604 Requires stylus Ideal for not OTHR. (Lichfield) 0543 262495 Picase add post Ted G3EJK (Orpington) 0689 cAv owners hbook and wshop manual: £675. G4MPO OTHR. Buyer Inspectoollect (Cheshire) youngster. £12 24 Yaesu FT203R with chmrs • TRIO 458305 with 500kHz CW Hie, spare sel 51208 £99e3 G6FOK. (Chester) 0244 300779 oh drrver and PA valves- £675 G4UTO OTHR 0 • FRG7 AX. £100. Base scanner PRO2004 25- 0606 47552 • TS820 HF Icyr with digital display. £400ono. Trio 0670 824454 520MHz. 760MHz.1.3GHz Almost new: £300. • OTH 3 bed terrace. Easy access Waterloo. Cuy. JR5005 Ham band RX: £60. Eagle RX60 genc ou • BBC -8 80404 DS &we, green monitor. I28k Datong RF processor 0-30013S lido me match. Close Richmond Park and Thames. Small gdn tut AX' £20. Last 2 news referred to in Amateur Radio sideways RAM. Epson AX 80FT printer. 100 disks wired Kenwood: £50. HF linear, Arnentron 400W, 4211 ant support. Carpets. curtains Inc: £145,000. nag recently. Carr extra or deliver tor petrol cost. All in exc.cond: £450 Will spirt To see working, From 4x6/616 internal PSU Very lade used. G4HMC OTHR 0 01-878 5303 G3A4NV OTHR. (Bideford) 02372 74564 pease ring for appt G1AJY OTHR (Maidstone) ong packing and hbook: £400 G30JA OTHR. • 1683064HE ten. A1230 ATU, SP230 spi und • ICON IC751 HF ten. SA46 risc, Alnico 25A PSU. 0622 36911 after 7prn10139 (Manchester) 061-445 1026 w liners - £875 No spin, or swap TS440S and ATU. 50MHz Mr: £650. G4VXB OTHR. (Faversham) • TH60XX £130 Buy& collects and checks on ad 19 IC2751 cAv F183. UT36. CR64. AG25 raceme: Terry G4OXEl. (Hrtchin) 0462 35248 0795 533143 performance Dismantles on see Ant needs slight £700. IC475E chr FL83. £650. CTI6 sat cue: £50. • Ft X No.40A 03 -331.1.4112. 8-bands Batleymens. • WRASSE SC1 scan edr. Fax. high resolution attention. G4MPO OTHR (Liskeard) 05034 432 Will sea complete for £1300. SMC 25A PSU: £120. BFO. AM. Soiled case £120ono. Buyer collects. colour. VGC: £740. Save £220. GW6U WT OTHR. • ICON IC240 2m tcw, as new Mag mount, PSU. Mt mint and boxed /Use cassette deck modified tor G4KDV (011ey, W.Yorks) 0943 463083 (Conexo. N.Wales) 049083 681 £125. GU & 011411 (Manchester) 061-437 1734 MS: £20. G4JB41 OTHR (Yeovil) 0935 28341 411JAYBEAM 183 FIF ant Very good cond, up and • MARCONI 2370 spectrum analyser £2900. • KEN WOOD 'ode, E 2m, 45W. ten. Boxed. as • 116902. desk mic. BNOS 50W amp, Azden 2m running. Exarninabon welcome7t165cre. GIRL/ FM rig. SE /A Tranzinatch. ant mast damps. rotate. OTHR 0 0566 82421 HP8018A serial data gen - £600 HP5500 laser. new. Never used: £210. Worn IC32E with W35" compete. G I ce.e.4. (1 0376 562108 £280 loom R71E row, boxed: £525. Trio 10A PS11. 2m-Soi beams, cables. bits: £550ono the lot JVC • LOWE HF125 all opbons feed. FM. portable, • BARGAIN ot the month Station sea up due to £70. Kenw•ood MC60A me: £45. (London) 01.852 GX88E colour video camera plus case. PSU, con- keypad. carrycase with rebates and manual: nects to any video: £150ono. GlECL OTHR. (Ma , £395. Creed 444. 10 rods paper and STS TU: £50 impending move. HF Sews KW Atlanta cW PSU , 1141 after 6p1089 split. me KW103 sympwr meter. E-lee-Match • DATONG 113 filter. £70. Hansen W7205 140. 10(1 Keynes) 0908 666861 the lot. WSI9 MK3: £50 ire Varienele 240V AC AT U. LP bite. 80-10m 100Wiout. Yaesu FTIO7M c' 45CMHz sm ear meter: MIT Yaesu MD1B8 desk • YAESU 11200.FP200 HF ICVT basedabon 80 PSI) and headset GI3RCG 01101. (Krailstord)

RADIO COMMUNICATION October 1989 95 MEMBERS ADS

056581 2262 wise OW £200 Would exch ether rig for good HF FT709R 70cm tvheld with ceegr. FNE.4 etc: £140. 2m tubed with serf me: £170. Yaesu 11221R with • DRAKE T4X13 transmitter viith AC4 PSU. man- gen.cov RX. eg R1000. F RG7 etc with cash actust Kenwood TS8200 160-10m TXRX. digital display, Mutek: £350. loam 202E. VGC: £140. Bolcom ual. v good cond: £250. Planar keg counter G4NNO OTHR (Merseyside) 051-645 5346 IF shift unmarked £490ovno Win deliver reason- LA106 2m linear, bust: £40. COFIAS . (Swindon) TF200. with TP600 pre-scaler. 600MHz. caor. • ST RUMECH Versatower 131420P40 std post able distance G3TCO OTHR (Bristol) 0272 0793 874614 manual, mint cond: £95. Preen buyer collects mounting with H2R H2FI head une std emotes: 6131068 • RA17: £125. Cohan 14m colour VDU plus UR G6A0C OTHR. (Oxford) 0865 243634 alter £400 G4PPZ OTHR. (Bedpan) 0308 897189 • YAESU FL21002: £600 F1290R: £250. touch. £50. Apricot FP portable Computer. 1M 7p1089 • SILENT key. G3N1-1.1 shack clearance. F1101 - FT780R £350. 10901P. £350. CBM64 with: RAM. mouse. bads at severe: £250. Philips Sys- • CTE 1603 2rn Meld air nead.Exc.cond, £120 £150. 2200G Too with PIS: £40. SEM Tranzmatch Com m package: £175. Alano. G4SUI OTHR. It terart phone. working: £50. Stomo COM713P3 2m Butternut HF6VX vert 10-80m ow radial kit. Nearly with noise bridge' £50. KW Z-Match: £40 Sony 0924 495916 synth manual £25. Stoma COP863R portable.. new. £115 Yaesu FT107V Mr 2m module li.fted, 2001: £80 Other small items, seer meters etc. All. • COMPLETE loam HF station with aces switch 70cm. manual: £30. HP storage display: £20. Rick with hbook: £115. KW2000A tor/ OW PSU. un- ono. No contact with widow please G400S. controlled from km, comprising the following: 740: G8KSM. 04896 661 marked cone £175. GOKIJ (Co.Durham) 091-581 OTHR. (Brighton) 0273 307992 MOO. 720A, £600 IC LKL: £1200 AT500, £300. An • TENAMAST 42152111 modified ow 3ele Mosley 0317 • YAESU F RG7700 rev, Ninth morriones. FRV7700 with PSU. TB2: £150 Altron 35ft telescopic ettove Inbander beam 20,15210m rotator and cage: £300 • SONY 20010 err. as new Geed: £260. G3UF0 VHF ore and FFIT7700 ATU. Bought new and wall mounted mast: £300. Ail the above in mint Ftealterit SB610 moneorscope ow manual' £45. OTHR (Solihull) 0564 777802 unused since A lanced. VGC £250. Philip. [One Would like to sell station complete lar £2850. Sip gen Taylor 68AM, no manual: £45. An • KEN WOOD TS430S multimode HF tcyr. Inc FM, GOFKE OTHR. (Brandon. Suffolk) 0842 810409 but will consider separately il necessary. Buyer ekc.cond. GOGXX OTHR. (Leeds) 0532 537439. me. user and service manuals, together with • REALISTIC Pro32 tehold scanner program- inspects and collects. GOCJU OTHR. 0342 • JAPAN Radio Company NRD515 comm row P5430 PSU and AT130 ATU. £800. Me. Mod mable 200 mom scan covers 68-88MHz VHF LW, 312374 %vie. ser.no BR25534. Pristine cond. one of last batch MMT14428 1 Onv2m 10W Mr, with leads to, 108.136MHz AM, 138 144MHz gen. 144.148Hz • HOWES CT X80 board with dal £10. CVF80 manufactured. Fully checked by Lowe Electronics TS430S £120 Together, £875 Decscope dumb 2m Hant 148-174 h VI-W.380-4507cm ham. 450-- VFO: £6. Manuals. 1541811J. TF10418. PTC2107, July 1989. Frst sensible otter secures. Heavy duly terminal. 11152. Owerty pies numeric keyboard. 47010w UHF . 470- 512 te UHF. As never' box. Cost 1155 photocopy: C3ea. Assort wire-end valves: rotator. Each 2m motile or HF mobile G3LPA RS232 interlace, selectable baud rate, panty etc £250. Accept: £130. (Breaker)) 0274 602856 £2 50ea inc post MIZUHO 2m leir SSBC W CITHR. 0536 760336. With manual: £20. HP3721A correlate with manu- • SET of Yaesu mobile ants 14 wave 2m. Sewaye- 250m W geoid. GWO: £35. John. G4VPU OTHR, • YAESU FT102HF. FlY901 trans 2nV70cm. als, tor scope conversion or WHY: £10. RadCorns. 2m. 80m. 40m. 20m, 15m, 1 Ore. with gutter mount 091-252 2304. FC902 ATU: £550ono. For complete station sale bulletins. 19521983. Offers. Dekvey possible and coax . £50. tie.Mod 2m encamp wah2 outputs. • IC240 2m rnoble with all channel modification only. 641/TC OTHR. (Dorking) 0306 885705. reasonable distance Irom Southampton. G8FHF. not RF switched. Betting lee sockets: £10. Say £110. BNOS 50W linear with rearm,. nearly new: • EDDYSTONE EA12 sell a v.good ref. cm 0 0794 517484 AN1 active ant suitable ICF7600. ICF2001: £20. £75. Wit sell as a pair. £175 G4AEZ OTFIR. 01- manual and spiv plinth. (CanwOritty Wale) • TONO 5000E RTTY terminal um: £250. Mini frequency counter. model FC5M, Ikes-50mrJ 360 7100 eve. 056681 493. POCOM FrU2100 RTTY later. matches POCOM s: £25. Stenwa LPF 50 ohm 500W, £10, 4 type • KEN W000 TR9500 70cm muttered° low mint • TOKYO Hi Power 10m SSBC W toe. Ivemouni, AFR2010 decoder: f200. Patio printer stand, HP3A high pass filters: f 1 ea Amstrad 6128 com- cond with cavity wavemeter and mobile whip. noise blanker lined: £190. FT23R 2m Wheel, ball. £25. Datong A0370 active ant wiPSU £30. Palo- puter with built-in disk drive, colour monitor, books £275 Matches TR9130. Mic.Mod. 2m gasket chrgr. case: £150. HF6V Butternut HF veil ant: £85. ma/ LAI 10 e9 amPw/6 10095401db- I 5MHz: f 100. etc. Bargain. LiSO. Hornebrew G4IDE RTTY larre- prearnp: £20. Howes DOSIX80 row bud in metal G41GK OTFIR. 0296 747013. Alpha Della RT Transa -trap surge protector w/ nal unit: £25. Samna radio control outfit with trans- case: £20. Marten GOHRZ, 01-590 5490. • KW Manta ton cm pwr pack, manual, diagram. spare cartridge: £10. GDC data switch Centronics mitter row. 3.5mOs plus 3 De3S origines. due, • YAESU 11208 2m FM Mired 144.148MHz KW Eze-Match. KW101 mer meter. All in good Type-AB: £50. Edu.Equrre PSU vanabe 0-30V 2A balls etc: £75. (Exeter) 0392 877819 coverage. cm case. clue and spare bans, £125. cond. Has been serviced by KW: £200 the bundle. max £35. Kantronics Signal Enforce. audio fete • 1S830S. MC35S. me, mint cond. £680 No G4SAI OTHR. 0707 330419. G3Z0V. 0843 220125 day 0843 227061 eve. 115VAC or I3.6VDC: £50. Technical Associates offers. 04 VON OTHR. (WhItchuich) 094872 460 • YAESU F129011 with Mulek prearnp. heavy duty • viC-20 ()Massa°, 16k expansion. ewer° Inc active presdecton 12VOC: £20. Dyrnek DP40 • RACAL Sweat 30 HF manpack 1.6-30filliz nicads and chrgr. Torre 2m 40G 2m linear. 30W Music Comtese, educational. games. plus Ma- passive preselecter: £30. Datong Auto wood RX. ATU and sweRF meter. 5.20W output output. Daiwa C74540 see/pm meter, £300ono. eels RS232 iMerface kit unmade. leads, books. packer blanker £20. Polaroid SX70 Autolocus USFILSIICINiAM tufty waterprool, with nylon GM I OSK. 0738 31161 after Sen. also PAC RTTY modulo (needs) personal eel Lind camera with sa -timer: £50. Shipping extra case, telescopic ant, headsets. handset, CW key. • YAESU F1101. VGC eV, ser wee manual and E prom re TMS2532othenerse F B. Ai for: £110ono (Reading) 0734 722085 manual Highest sensible otter secures 10m 45W. spare valves: £300. GOIPO OTHR. 0784 251310. Les. G4HOU OTHR. (Bristol) 0272 611093. • 1313C-B Veen ROM slot cumana 40TiSSiDD multimode USEeLSETCWIAM/FM sweRF • TS820S. TB3 Intender. KR600. Kenwood dip • FT1012D Mk3 FM. Ian: £475. SP901 spkr: £30. Epson RX8OFT Zenith mono monitor. View. Vie- meter, £140. 1.4121-10 20m Mod USEVCW 2vdis meter 014800. Decca KW103 s-webver meter. FC902 ATU with feted PEP rœtenng: £150. Trio wdata. Viewsheel. toystick. Serious games. chess. tee £139 Airealt altimeter 50.00011: £15. CCTV Going OAT Oilers to G41XX OTHR. TS120S: £375. Trio 7730 25W 2m FM mobile: Scrabble. McNeely. Hobbit. Alt exc cond with tenses zoom 115-150mm. £15. t20-100mm, £10. • HI-GAIN TH5DX 3-band beam. VGC: £250. Cu- £175. Trio 2200 meads, Chrgr: £80. Prater buyers boxes: £425. 01.440X0 OTHR. (Nape) 04676 Racal MA4203 transformer 9x6x3in 2401110/24V Dee 4ele I Om mono beam, as new: £30. Cushcraft inspect and collect_ Owen. G3NXK OTHR. 0621 251 trom 12V supdy: £60. Ftacal41)148, £30. MA4280. 3e1e 15re mono beam f90 G3PJK OTHR. 061- 816265. • SCOPES. 043 working with copy of manual £10. MA4231. £10. 2x unknown: £5ea. PP extra. E53 3213. • FT 101E: £120. Prefer buyer inspectsicollects. £40. Ofd Casson 2100: £10. 7854 double tetrode (Hershel 01.845 4008 • GOING ORT 15940S latte use: £1300. MC60 MK701 key, £8. Inc.PP. Brian G3NSU. (Leeds) Iiko OOV06-40 with base: £15 T ransformers. 450- • PS)ON Organiser model (.2 chi case. New. me. £40. Kenwood SP230 splie £30. Yaesu 0532 630661. 0-450. 250mA: £10. 1101/15A: £10. Buyer collects. never used: £100. No ones. Des. GINEK OTHR FC902 ant tuner: £120. Mini-Max 3e1e blonder. • 70CM module Ion F1726R. Craned, good cond. No offers. GlEHF. (Bracknel) 0344 412072 (Bedford) 0234 852865 (170. Cost over £300. New Anion haver 3011 mast £230. G7AFH OTHR. 0772 621948. • POLAF1PHASER It PL259: £20. Twin Teac 511 • KENWOOD TS670 quad-bander. AI modes. GC with KR403RC relator Control box needs atten- • TRIO 751E multimode, purchased late Feb 89. 4m hall height 56401 drives F055A cased PSU. RX Vora synthesee. Twin VF0s. 80mem. 1 OW tion: £180. 10m FM kern and repeater deft 50W Mint, boxed with me. Hardly used. Owner decided GWO. £35. Newbram computer with RS232 output 12/13.8V working. VGC: £575. G3GHB amp: £20. 2x PSUs 8A cont. 10A surge. 3A Semi - against mobile use. Ideal tos basestabon which GWO: £35 Newbran disk controller' with intermit- OTHR. (Worcester) 0386 792582 £15 the pair. Web per meter SP350 1.8-500MHz: owner already has. New price £599. Sell to,: tent teen: £5 24MHz Pnnce green screen mender • TRH) T R9130 2m inultmode Boxed in manual. £40. Adonis mobile mac: £10. Kent brass key: £25. £475ono for quick sale. 646113 OTHR. 030677 £65. Bnan. GOKDX not OTHR. (Wigan) 0257 me. Halo ant Mmount. VGC: £330. GOIAR OTHR Altai tr.dip meter. Never used: £25. Drae VHF wave 362. 422547 (Loughborough) 0509 217655 meter £5. Met wide-spaced 5ele SOMHz beam: • DRAKE 1147. updated to T R7A spec. All laters, all • FDK multi 750E 2m TX/FIX CWSSELFM 1/10W. •1COM IC202 2in SSB leer and helical ant Boxed, £20. Brian. G4XWI OTHR. (Gravesend) 0474 bands, noise blanker. PS7 PSU. hbooks. £200. BNOS 12V/25A PSU: £200. BNOS knee £95. 68030. (Reading) 0734 580082 566479 we. Orig.packing, £72S G3F10-10THR. 0432 267876. LPM 144 10;100W: £165. Datong ASP RF speech • KW2COOE torr, manual, spare valves: £250. • HOWES burn 80m Mr: £60. C130 ATU: £20. Hi. • SUPERB VHF/UHF OTH. 600fIASL yet only 15 processor: £65. Sinclair ZX SpecUurn 16k: £20. Al Allai dip meter 1.5-250MHz. Buyers must collect mound MK705 paddle: £20. Touch key: £15. Ex- miles central London. Flint and brick semi-del in mini cond and in ong boxes. Hornebrew PSU Both good cond. An OTHR. W averer) 0889 pander 500 me, £20. Pair PH pocket phones plus period cottage in completely rural location yawn 121,45A amber protection. £20 Cushcralt 4eie 562445 night dege. £25. All immac-cond. Colin. Ge2VS the sought-after area al Downie. Kent 6 miles 2m aenal £15. Amstrad PCW swam: Dr.graph • MOSELEY TA33JR Ueander in lair cond. hence OTHR (Birmingham) 021-444 7804 . Bromley 3 beds, dining room, sitting ream, fitted graphics. £20. Statistics programs: Arnstal-12 £15. Eele 2m quad as new £20. G3MSW OTHR. • COLLINS 105 series TX Col 52245. WW2. 1.5. kitchen. bathroom, detached garage. full CH etc. descriptive parametric non-parametric statistics' (Harpenden) 05827 5549 12MHz with per pack Otters G4JBL ¡Shoreham, 600 HD lower. 66 countries worked 144MHz. Of- £30. Amstal-3 regression. £20. Amslat-6 Amnia. • MARCONI 1181 GP RAF airborne RX 150kHz- Sussex) 0273 452617. ten in the region of f 160.000. Clive Penna. G3P01 £20. Quasar multipurpose statistics: £20. C-Siam 18MHz AMC W Nmstrip tuning All valve 28V with • TRIO 15780 2M70cm mulemode basestauon OTHR, 0959 75992. Amstrad PCW to PC transfer. £25. AU orig. disks spare rotary transiormer. Conti unknown, believed ton Execond: £700. Matching sea SP71: £30. • IC ON 751 100W HF tow. SM6 me. Aknco 25A and manuals, books. CP,10 plus hbook. £6. Mal- working. unmoded. Buyer examine and Mika. MC60 desk inc. £50. Trio TR2500 14AMHz hhekt PSU, £630. G4VXB OTHR. 0795 533143. lard Base. f 5 Rade Communrcaten Ftbook 5th Offers around £25. G3AVJ OTHR (Liverpool oW S12 base dugr. MS1 meteor,' 514025 spkr • HANDHELD. loom 1C2E. needs. mains chrgr. Ed: £10. VHF-UHF manual 3rd Ed: £5. Solid Stale area) 051 489 3325 mic. spare PB25 rucad: £160. Bencher chrome MOW@ chrgr cord. Separate spkernic: £180. G3JIE Design tor the Radio Amateur: £5. Andrew Thomas • TS830S boxed in mime cond. Inc 500Hz CW Lambe paddle and Drama DK210 electronic keyer. OTHR 0603 714686. 080141, Milton Keynes) 0908 568952 alter 8.1089 filters and deluxe knob; £700. AT230: £130. Both mint cone £75. 70cm 100W linear and PSU. • COLLINS KWM2A P/A2 312E15. RE: £675. Ken. • G20AF linear using 4-250s. Working, needs SP230: £30. 01600 600W dummy load. £25. 242C39: £100. 2m linear 2x4C)(2_50: £200. Famell wood TS930S auto ATU extra filters: £1200. Ed- some attention, £150. Andy. G4HUE. 0 01-989 LF30A low pass fee. LIS Mark EInncal GODYX. 0 136V 5A PSU. £20 144MHz 4ele lonna. met dystone S940. £110. Consider ouch Cans RE 0867 0634 44400 x3769 day I 089 cone £15. Welt CHZON 2-way N-type coax 75538 3253 Buyers collect G3GBB not OTHR. • FT290R. boxed. needs. me. case. strap. 25W • FVIOIDM remote VEO in GWO: £110ono. Tony switch £20 High pwr VHF/UHF thru lone seer me- 0284 753049 day 037983 657 eve linear, PSU. Jaybeam IOXY: £250. Muter GOKUL (Bognor Regis) 0243 865468 ter: £20 Cusheatl DX120 2m DX-array. unused: • YAESU 1129011 Mk2 2m tcvr. 11-2025 linear TVVF50c Sin Mr: £125ono. G1XTE OTHR. (Nor- • YAESU F110120, FM. Ian. FT9OIR 6m. 2m £35. LOF450 N-plug: £10 Fluke OMM 8010A amp. 1414031 Minount £375. FRG965 VHF/UHF ynch) 0603 426649 FC902 ATU: £900. No split 432 ms ht1.1 22m IF. Ones. 12m BY! portable TV: £25. Alan. G4PSU comm RX nne ext HF corte, £275. GICXA OTHR. • YAESU F1101 Mkt with 031.1.1 speech dope. £330.Kenwood 3200 FM and accs: (85. Eddystone OTHR. 0635 71150 alter 7pm. 061-223 7716. New VEO. GWO: £275 Buyer cartels OTHR Il 770RIVA2: £40. F7290 Mutek FE. needs. ,duck. • YAESU FT726 multimode 70cov2m6rn plus • FT200 matching PSU. Ideal beginners 1st HF 01-530 5937 after 7p1089 clue £235 Ntmount: £15. MM14410LS. £70. satellite um: £950. Me Mod 2rIVEnt Mr. £200. ng. Very easy to load 10-80. Would consider each • KEN WOCiD TS940S tuner. built-in me. Lowe Alm a ELH230E .- £40. W eb SP3130 18-200Hz Lowe SAX 30 calm row: £75 M in VGC. 0E201 for FT2908 etc or C2250110. Eamon. 63 Glenantt AM mod. Immac: £1600 Take mint £5711E pt. 200W: £30. Hansen SWR508: £15 Hokusin du- OTHR. (Selby. N. Yorks) 0757 288185. Cres. Batty-acne, 13143 GET. Sorry no phone. ALA. each. 64f3XY. 31 Beats Ave. Cavesham. Read- plexer 2rnafern: £15. $EM VHF Tranzmatch, £15. • YAESU FRG7700 comfit roe plus FRV7700(2) • TS520.5 with flue. CW liner 10MHz. £400. 1520 ing, Berks. (t lieathke regulated NV PSI): £40. GOAAH ant. £50. VHF cvtrs. boxed, unused: £300. Eddystone model ed VEO: £50. JIL SX200 scanner: £75. Leak Ste- • HE NRY 2ED classic linear amp. As new. see ads 100W dummy load: £211 Heel Mound HK704 key 77011 plus model 77014 recorehboned: fecia reo 30 amp: £30. Leak Slereotetic FM tuner: £25. in OST. £1100. G3VX2 OTHR (Maidenhead) 0628 £15. VD84VA me: £15. AKO WA1 £20. GP432 Eddystone del. new £15. Marconi vacuum lute Early ERA Microreader, £75 Can extra. Hatlicral- 27350 34543 vert base. (40. GP23 3x5.6 vet 2m - £15. voltmeter. unused: £35. Sig.gen, £30. Scope: £50. ter S36 FB R8-143MHz. £70. Coltect. GMOT • KENWOOD TS520S tow with 005 digital dis- PF70x2 dine, rremount converts to 4m. Plus some 0633 253949. OTHR. (Folkeslonel 0303 276063. play counter Exc.concl: £450 G4FVR OTHR. •ale £50 Boot Westnensters. remotes. sees. • HEATHKIT 58102 valve HF icw. PSU, spkr: • ICOM IC720A solid stale 9-band 100W HF low, (Scarborough) 0723 365043 mans PSU Some dais 2m'70cnv4m G6TE0 £175. Heathkil S13104 13.8V HF ton. PSU. sole 100kHz-30MHz. Gen coy all modes. FkliSSELC W1 • YAESU 11101 80-10 HF tort. plus Europa-B 2m OTHR. (Newton Abbot) 0626 65754 £350. M ein TU1000 RTTY terminal une £50 AktfITTY. Buill-in vanable speech compressor. Mr 50W OP Manuals. unmarked. GWO: £250. • YAESU FT 101 HF ten CAV G3LLL speech do Tokyo 'tru ffle Micro 7 70cm Tondo: £50. Alle a. Boxed, in exc working order £635ono. G4OUB GI LCI OTHR. (Maidenhead) 0628 22352 per. Good cond Boxed with manual. £250 Buyer C.15CCU OTHR. (Bristol) 0272 721744 OTHR 0773 761412. • YAESU FT736R with 6m module. SP767 eat collects. G4GTR OTHR. (N.Derytehire) 062987 • SSTV robot 400 Merl will, 30000 colour board, • VERSATOW ER 6011inc enriches and cables. 2m see, 1401138 desk me phis various ants: 475 trame and lino sequentral, sync separator. mane • crossed yam and 70cm beam with 40011 al low foss £1700ono. GlWXC OTHR. (Woreurval 0903 • DATONG PC1 gen.cov RX eve. £103. Datong als, circuits. leads. GEC camera_ old but working. coax Bargain al - £425 °ewe MR750P rotator vnih 75.5898 morse tutor 070. £40 Both hardly used. G4FAI colour beers, £350. GOPAD OTHR. (Essexl 0375 round controller plus all cables. Cost £254. 6mths • ICs Fan-1 demodulator. Decodes lax. RTTY and OTHR. (London) 01-368 4588 671238. old. Will accept: £140, Yaesu F1 7670X wrth Navtex. Connects between SSB. RX and Epson e ICON IC740 HF tee 9MHz and 500Hz CW • KANTRONICS KAM 285V all-mode welt 70crn units AU mint: £1275. G1MVO OTHR. 0836 compete:4e printer: £200. Trorex-1 7A PSU: £15. filters. high shape factor FL44 455kHz SSB fee. Weelax INC. An leads 2m. HF. Manual. BBC pro 647938 day 0530 417335 alter 6pm. Tech 7E220 audio generator. 20.200kHz: £15. FM, electronic keyer, marker unit. Service manual. grams disk. and Eprorn prograrns. ernes old £220. • TRIO 91159 gen.cov RX. GWO. VGC: £45. Ha- G3RDG OTHR. 0 01-455 8831 error:one £650. Bearcat 220 scanner £70 2nv Would (=seer pl ouch modern enter HF RX moat NCX5 tee with manuals, mails. me. cah. • FT901DE ten, memory unit fitted, CW AM,FMJ 70cm colmear C25. Buyer collects. carr.extra. G4NKH OTHR. 0253 62925. brace. spare valves. Working, £125. Halliaatters SSELFSK SP901 spins VGC: £400. F129011. m- John, CAPEO OTHR (Horsham) 0403 67338 • YAESU F1211RH 2rrvFM mobile 45W as new: $27 RX Fair cone £35. KT88 valves x4. Boxed. uds, due. son case. Dial light not working, other- • JAYBEAM 103 Inbander, exc cond: £110 £225. loom 2E0E 2m mulemode: £230 leo TH205 otters Eddystone FM tuner. Good cond: £20. P.

96 RADIO COMMUNICATION October 1989 M E M B E R S A D S

Mitchell. 19 Asbourne Ave. London, N20 OAL. ton) 0703 421862 eue-vire or via pkt on 675. technical manuals. Cash needed for other prop nuble source of supply of these very welcome. • HL2K HF linear 2x 3.500z: £900 182 tnband • SHOLING, 1 mile from Southampton centre. eels: £300 Dave. G4ZA0 OTHR (Taunton) 0823 Larry, GOHTR OTHR. (Tamwonh) 0827 898024 • EDDYSTONE panoramic display unit EP961 • yam: £30. 0114 aide 6,4m: £50. 70cm Cushcrall good HF/VHF 0TH 3 bed semi, lined kitchen Inc 253904 boomer yagi: £50. Braun 5E600 digital 2m multi- electre oven and gas hob. 2 reception rooms. •1COM tC 2E 2m fl/held cnir case. spare ball. chrgr unit to be near mrnt cond. with leads and manual. mode tog: £135. MZ8OK computer env twin disk utility. Modern storage heater system on Econ 7. and manual. As new coed: £125. BBC computer Will arrange collection. Box 5347. Ras al Khaimah. and printer: £150. Revox 877 reel.to.reel recorder. Large rear gdn. driveway to carport. In superb with DFS and cased dual 80.track double.sided U.A.E. () £450. Revox linear record deck: £175 M100 DAT decorative order 40f1 lattice eltover, (»late mast half height drives with manuals and View WP: • CASSETTES for early Minaret dictating ma- recorder: £675 M500 DAT recorder £725 Bird 43, with planning permission: £66.950 No chain. £275 Will split. Hewlett Packard equip, chines and for Garrard lape decks. Also early no elements.: £100. 2m Inear 2e 4CX250B. Needs GODXC OTHR. (Southampton) 0703 421862. HP59400A. RS232C to 1-1P113 eve. £100. portable lape recorders. Simmons G6C8E. (Chip. some attention: £295. Hi quality outdoor movement • BUNGALOW. Detached approx 1,4 acre. se- HP8634113 3.2.6.56Hz VIO oscillator module: ping Norton) 0608 3377 detector £40. Clarks SCAM pneumatic mast: cluded gob. Next sea and Sussex Downs. 4 beds. £250. HP41CV calculator, new and boxed £75. • PSU type 20309 for Collins TCS12 TX,RX Also £500. FTZ700RH 70.2m toe £300. Telequipment pine kitchen. 2911 lounge wah south.faang patio Card reader for HP41, new and boxed. £50. connectors for same. 11154 plus connectors. 054 split beam scope: £100. Sea-Ranger 5600 access 1A33/2m beams atop 40It mast, easily HP844313 tree-lung generator: £500. HP5105A. Type-F morse key Type-A hot wee ammeter. or manne VHF TX,RX . £130. 50 TV 6m module: £175. lowered for servicing. 150It I.w.: £125.000 G3L01 51108 erect freq. synth 1/10Hz to 500MHz rn I. Type.D. Thermo couple ammeter. Peter. GODRT 0703 255631 day 0703 813922 eve. OTHR 0903 754017 or 0860 420082. 10Hz steps with own keyboard and keg standard. OTHR. (Kent) 0795 876277 • TEN-TEC Century 22 HF CW toe 50W 3.5- • YAESU FC700 ATU suitable tor F1707. FT77 £500. HP1815A TDR.sampling plegin for 180 • VFO 230 era VFO for TS830. Must be mint. 28.5MHz lilted. C,w Myer and calibrator £300. etc. 100W with swr meter and dummy load: £100. sedes. £250 HP 1123A FET active probe 220MHz GW3TMP ¡I 0244 549563 day 03521089 Ter -lec PSU 230VACJI 3.5VAC: £60. DC cacua 04000 not OT HR. (Tuxford) 0777 871915 after BW: £50. Bryans 25000 A4 XV plotter. new m • HF 3.30MHz element for Bird 43 Thrteline Also breaker Mr Century 22: £10. G3UOZ OTHR. 021. 6pm. carrying case £125 John (Walton:1)01428 0974 KW E.Zee Match ATU or similar. G3SL1 OTHR. 373 8806 • WW2 German precision VHF meter typo 183 (Reading) 0734 474992 • MICRO WAVE Modules 70cm pwr amp Eric cond but neavy Free but must be collected. • YAESU CW finer type XF30C for FT 101 E. MML432.30L. Good cond. as new: £150ono. 995 Also Kentaro KR500 elevation rotator. Used one CeIDAU OTHR dearlsear 0272 852304 Marconi sig_gen: £50. 1066 Marconi mg gen: £75 season £80. G3FPJ OTHR. 0364 52238 • CIRCUITS and data Plessey AR1 radar 12.n John OTHR. 0353 741354 after 6pm • YAESU FT78 HF 50W toe. with 1.8. top band. viewing unit type 12600N complete inercator units • WESTERN Tower 4011 plus Mad unit all and FM added: £290. Yaesu FT48OR 2m multi. WANTED type 6. 182, 184. 233 etc Green. G4E2A4 OTHR • ow rotator. 2 winches raising and tilting, plus mode leer 1.10W: £250. Manuals etc Both in fine (BlackPooll 0253 47176 a Western DX33 inband trapped ant penetrator cond. GI LCI OTHR (Maidenhead) 0628 22352 • FC902 ATU Must be in GWO Tony GOKUL • YAESU FV1020M ex t doital VFOcvo leads and plus hato tonna 144MHz plus mast head preamp, • 100W HF solid slate torr 1.13-30MHz Yaesu (Bognor Regis) 0243 865468 after 7pm Ij manual please. Pete, G4XHY OTHR. (Stamford coax The lot £500ono Buyer collects. Peter FT301D with digital readout. AM and narrow CW • HEATHKIT HW30 144MHz AM toe, otherwise Bridge, York) 0759 7102? GOKEP. 04867 81358. lifters FP301 mains PSU with spkr. 12V mobile known as the Tweet Good price paid for good • VHF marine band ree Daiwa S119. Belcom • PACKET PC INC 01151 typo I VHF,HF: £80. lead. mec. all lest and packaging Robin, G4IRD working model G8GZZ OTHR (Wolung) 04862 AM11.217(1 or simulan, slate slats heed. GOGKL 045383 3411. OTHR. (Northampton) 0604 644341. 23506 OTHR. (Hastens) 0424 444376 • 3ELE beam fly-gain with rotator. cables, balun, • TRIO 158305 HF TX,RX fitted YK88 CW Idler, in • LIONEL .138 mechanical bug key. UK cheque • HF toe base or mobile 80.10 WARC bands not control unit Purchaser cumanitoo . two. G4JW mint cond. Basis of superb HF Mahon: £650. £1200 paid All letters answered WOOS. Waldstr 57. D- OTHR. (Shellated) 0742 303686 new. Spectrum ZX 48k computer £48. 1Thanen essential. F17, F1101 or similar OTHR (Coven- 4902. Bad Salzunen. Germany • PYE SOW transistor PA type A200 on 4m. new, 0843 294446 try) 0203 450476 • EDDYSTONE aces. SAneters. spurs. morse • ICOM AT500 ant tuning unit. Must be in eel htook: £75. CDR A1122 rotator £.35 Tonna • ICOM 1C210 2m base m en. boxed, like new: keys. etc. Also Eddystone manuals and info exc cond G3SJH OTHR (Birmegham) 021.427 F9FT 23crn 23e1e: £15. McElroy bug key: £25. £160. DX300 digital ca m revr: £120. Creed 444 sheets. Originals only HF Eddystone valve roes 4CX2508 chrmneys ceramic x2. PTFE xl. Oilers. teleprinter withstand and terminal unit: £50. G8GIL 1115 Still req'd Nick. 01-852 4065 leave message • H.Book or CC T drag for Minimeter double Super' Andrew Helix. new. G4 MAW OTHR. 0803 555488. OTHR. 0525 371307 eve. • MANUAL for Heathkri transisler checker IT. 1B to net. Ham bands only. MR44 Mk2. Outright pur. • COMMODORE C64. Pakralt 64, disk drive. • KENWOOD SM220 monitor scope. still under borrow. purchase or copy. GLIBL OTHR IShore. T.deck Seikosha printer, green display monitor. guarantee. As new. boxed: £275 Mark. GI3YOH chase or photostat please 11 pens (Hemel ham. Sussex) 0273 452617 Hempstead) 0442 46910 • IBM convertible memory modules wanted Also PS-US. Doctor mp Package, snvare inc Basic pro. OTHR. (Bellast) 0232 795783. gramming course plus various other packages. • KEN WOOD TS440S with 500Hz CW filter fated. • HF ton, FTIOIZD Mk3 or FT707 with PSU. must technical service manuals G3LBA. 8 Deacon Cl. be mini and no mods Jim. ¡Bournemouth) 0202 Full supporting manuals. Will not split: £450. Few months old. little used, mint cond. boxed Downside. Cobham, Surrey. KT11 3611. 518828 GODCS. 0582 576107 £900 Mark. GI3YDH OTHR. (Bellas)) 0232 • MAINS pwr unit and spkr mc for Yaesu FT207R. • CIRCUIT diagram ol Hrtainkit OS I scope. Also • ICOM IC2KL linear amp with matching IC2KLPS 795783 Lowpass later RAM expansion foi Amiga 500. IC MSM5807 chip or advice on where to obtain Reim • PSU, as new: £1150. Buyer inspects and collects • 2M leer FM 1.25W multi 700EX FDK: £145 ATU type 8520 3-way switch box for RS232 plugs 3. El9FE OTHR. ITipperary) 062-51592 SEM Transmatch 16080-10 Ezeune lined: £100. biesement made or photocopies etc and phone way switch box tor Centronics parallel plugs. Hand calls Any hetp most apprecrated Tat l ¡Doncaster). • SCOPE Marconi TF2201 dual trace DC-30MHz Tim 15120$ 100W ton £450 Linear amp scanning mic for FTONE SYeare programs to use 0302 789192 0.05.50V.cm. 50nS.500mS en velhslideback volt- FL2100B 1200W: £650. (Stafford) 0785 840872. Pace Linnet modem and PK232 with Amiga 500. • HELP, Can anyone help me wah a KR6OORC age and time measurement scales Complete set • DRAKE L4B brear, 501e5 use Mains trans Daisy wheel for HRISprinter Any (AIM above can control une 1 need a good second hand one of manuals Only £55 for qurck sale. Mark Lee, former sc locero liner two in good order Offers on be sent to a UK address Ken Lee. C3OBAB Casa. G6FKN OTHR. 01.876 4379 eve. both or separate. G3GJZ OTHR Johnny. (Gamsborough) 0427 5266 128 La' Plata, ()Kline. Andorra. Tel: 36347 • RACAL FtA17 Mk2gen.cov RX 0.5.30MHz rack • 15930S 0w YK88C. YG455C fillers. service • VARIACS. 2A. 10A plus larger 16e) G3RPO. Il • YAESU FV107 VFO for F1107 Erich heavy duty mounting model with manual. £140. G3VSB manual, Mk: faulty PSU, net working. Or spares or 0285 76329 rotator for good HF or 2m mobile. Preferably Yaesu • 2ND VFO, kHz scale. unit for Racal RA17 work. OTHR 0889 590289. repair, hence £495 Den eon GLA1ODOBHF G3LPA OTHR. 0536 760336. irig or not or will buy scrap RA17 any model re • LONG persistance CRT 3FP7 plus base'deal for gwo. £295. GW4RYK. 068 686 255 • DRAKE R4245. Collins 851S1 cash waiting spares rt 2nd VFO intact. 2 reed (Mansheld. Notts). 0743 884859. VLF scope. £4. Stack of 88mH inductors plus grist • KENPRO KR. 500 elevation rotator, never used, 0623 2229473 ove.wM1089 • SSS adaptor for Grunclig Satelht 2000 Also tor W3NGN CW later as in AFIRL h,book: £5 Post £100. Chartwell LS3.5a loudspeakers, pair. £150. • MEDIUM wave command few also R1475 RX. manual for Racal RA171 RX. G7AFH (Leyland) £1 on each. G3HNP OTHR. 0493 393560. John, 0743 884822 and 11154 TX. G3VXI OTHR (lanes) 05216 382 0772 621948. • KAM INC V2.83 with Tandy TRS80 model 3 and • ICOM IC.R7000 scanning 100O3e01 with remote • ATLAS 006C digital dal allas 220-CSNX AC • DRAKE L7 linear amp. Drake MN2700 matcning loads ol swage. Make a reasonable offer G4DRH. control ancl speech modules fitted. 0.130N 25. consort() atlas MT1 transformer. OTHR. IChatfont network, Drake PS? PSU immedrate top cash 0253 730033. 1300MH Chsccne Antenna. Offers G4ZTX OTHR • CREED 444 with manual plus pug TV. Home. St Giles) 02404 3926 price for mint units, 0602 609345 anytime • SCOPE. Solation CD1212. 40MHz single IraCe. • DRAKE R7A. RI13. DSR2 or 114245. Cash wail. brew. £75. S119, VHF, VFO plus 3 xtais and my • DRAKE L7 or L75 knear G4PIP 01 H11 05642 24MHz dual trace £75ovno FROX500 amateur irig G3YFK. 0 0743 884858 3200. bracket: £30. SAS. Cash only apply G6EZK. 0703 bands roir. All modes, all fated Also 2m cvtr 260'936 anytime. • BOOKS for African Student. Electrore Devices e EARLY wireless sets wanted Also horn speak- and preamp: £100ovno. Both items in exc.cond. C/ • TRIO 9130 2m multimode 525W VGC: £350. and Circuits - Bogart Telecommunication Technr. ers. xtal sets, unusual shaped ,ades. early Ham w manuals Ken, G4WAS OTHR (Walsall) 0922 con. Smithson. Book 1 and 2 Serve. G4MOX rows. Any cond or incomplete welcome Also early GOGKL OTHR. 0424 444376. 475057 • DYNAMCO 7100 scope with hit and 1e2 OTHR. (Axbrene) 0934 732655 books. components. catalogues. Wireless Worlds. • AVO valve characteristic meter Mk4 with valve Drake MS4. Sherwood hems James G4ERU, 5 bases, all manuals and carrying mull VGC. £125. • RADIOeelevisron Wallets from any period lor data manual. GWO. clean cored £25. Hewlett display in the Wrreless Museum Also wartirneipre Luther Rd, Winton Bournerneuth 0202 510400, Star phone 70cm few on 11136: £45 PSU 12V 20A Packard clip.on ammeter 1mA .10A £25. Commo- with 0,V. OC and overtemp protection: £70. war Radio Times. catalogues, magazines, books. • ICOM IC202 2m S MCW ruheld. 045383 3411 dore 1526, MPS802 NLO serial printer 80cps. etc. BBC and Hi-Fi Yea, books. Cartridge and wee • COLLINS 11390A or 51.14 rcw, near perfect. 03000 OTHF1. 0788 72219 double stroke, dot realm: £75 Brent, 200W linear • COMMODORE PET 3016 green screen 16k recorder Car radios. mice keys. List amateurs preferably with all filters and Meek. Other Collins £50. Icom 10508, all mods: £40 (Grays, Essex) RAM with dedicated tape deck: £50. G3WUZ beMre WW1 G3KPO OTHR (Ryde. IOW) 0983 equip considered G2ADR OTHR. 0904 794680. 0375 378783 OTHR 0278 786330. 67665 • MOBILE bracket for /no 2300. Ray. 6400K 111 KW1000 linear, new eonclenses - £270. Ken• • SHACK clearance. FT757GX as new, boxed. • COLLECTOR requires clean 5)(28 or SX28A OTHR. 0842 752748 wood Trio 19280: £510. MM144.'506 £90 MM • WANTED ror G2DAF Mk2 TX, front panel meter me manuals: £575 Hy-gain ei-band. ven. £30. roer. Data needed tor 358)0834. 11107, NC190 MML430,20: £75. MM frequency counter to leading 0-1mA resistance 600 ohms. Elliot manu. Unused complete VHF rotator £25. Also dummy RXs Valves 5130P. X81, K181, 31F7, 6K6GT 430MHz: £80. (St. Austell) 0726 843487 lacture, body do 2M G3GRB OTHR. 0902 20322. loads, ants, dip meter. 150MHz see bridge, cable Narrow SSI3 later for R7A: CF 5 645MHz. BW • YAESU F1.101 TX, FR101 RX separates I 8kHz Photostat of R7A eu/chop manual page 2. • OUALITY cased compute, keyboard with mov. etc Phone for details G4UPV OTHR 0705. Exceond: £450 pair. EKI50 Katsumi squeeze 33 Illuminated S.meter lot HROMX. A11880 parts rng keys. compatible with MM4000 RTTY toe. 501718 eve. keyer. variable speed. Hardly used: £55 • COMPLETE Yaesu HF station. FT757GX. dial-lock thumbscrew. voltage selector bakehte G3ZOG OTHR. W Woollcot). 34 Southlands Grove, Newby, Scar- • VERSATO WER Seumech 6011 or 40tt mobile FC757AT. FP757HD, MD1 desk mic, low pass plug. tuning-gang thumbscrew. IF quartz filter xtat borough, Y012 5PH filler £865. FRG7700 roe with ATU and 2m eve: Stereo pair big solo puShpulltransformerseg for 2x lama:, tower assembly. Inc base plated post. Rota • • BBC-13 Issue 7 DFS 80T DiS disk drive. Man- K188 per channel. WHY' Chris G8JFJ tor To match trailer already un my possesion D 1CW108 monitor scope: £45. CWR610E CW nesmann parallel printer, snvare, leads. manuals: and RTTY decoder cm amber monitor. £150. All in (Horndean) 0705 596836 Henry. GUOHRY La Mare Mina. Saline Road, SI £380 No splits. Aran GOGAR (Stallord) 0785 Peters Guernsey. C.I PWO and exc unmarked cond Ong.packing cnir h: • IC781. 10781. IC781 Must be rn good coed 662879 • BOOKS Hyways and Byways el Berkshire. and books and Idlest Genuine sale due to bad health. Howard. GOHZH OTHR. ¡Sultolk) 0394 460474 • YAESU F1790R. reads. chrgr. soft case. man- • UNMODIFIED Hoalleut RG1 RX. Cedar 250/S Hyways and Byways ot Hampshire, both by Char. Frank. GOHAO OTHR (Cowes) 0983 293402 ual, boxed Tokyo HL3OU 70cm linear All mire • FT726 owners 6m module Boxed with inst.. AC.PU. Send demilstprices to Marris. 35 les Kingsley. Will trade for cash sum and entire cone £280 041011 OTHR. (Wolverhampton). practically unused. Bought new trom SMC last Krngswood House. Farnham Road. Slough. SL2 1988 RadCom or all cash Paul W3OPP 18asing. 0902 765374 stoke) 0256 22795 eve. year. Sale: £250. No oilers please. G2FZU 01)-IR IDA • FT290R, chrgr. reads, canmount 7.8 gutter • HF rig. anything cond consrdered. (Thanell 0843 (Soulhwell. Notts) 0636 813847. • SP102 spkr loi FT102 must be in good cond mount Tokyo linear 30W. Good cond: £275ono 294446. • TRIO TS830S HF Icy, lst class cond 160-10m 63 WHO AMTORATTY swami for BBC with Ver. G8GMT 0543 75355. • FTIOIE or B. for mobile and top band Must be ei rnc WARC bands. SSE and CW. Little used and salerm Frank. G4YXS OTHR (Westbury) 0373 • 6M Mr 144MHz IF with 25W linear. both spec. good order G/A4CHX OTHR ¡Aberdeen) 0224 very reliable: £700. G4MPO OTHR (Cheshire/ 88678 Item E econcl Little used, hence sale: £90. Mike. • REEL-to.reel tape recorder. 12e spool mini. 317966 0606 47552 alter 6pm. G7CHD OTHR INorthampton) 0604 584933 • KW Vespa Mk2 and one PSU: £70ono. Som. mum Ideally Mae GX6350 Olher makes comae. • F1757GX £580 FT757 mobile mount: £20.. merkamp FLDX500: £25. Both clean Carr, at cost ered. WHY' () 0493 393658 FC902 ATU. £145 Datong FL3 Mee £85 8NOS • API 1860 Vol I sec.8. chap 5 Power Unas 32. G4ORR- ¡Hull) 0482 24743. 25A PSU. £145 Linden 2830 10m multimode. • FT707. FP707, FC707, m• mount VGC: £500. 35A Also API 186E Vol 1. sec 6. chap 4 Power £240 6408S OTHR (Farley, Wilts) 072272 752 G4KIN OTHR. (Liverpool) 051-526 4777 alter Units 114 and 115. Will pay £20. Am interested in all EXCHANGE • AMSTRAD portable computer PPC6400 2x other APs.M Gee, 17 Foxley Close. Mountlord Est. 611m. • ICOM 761. loam 745 2m and eim Ives. Collins 7201, drives. boltan modem Hardly used, genu- Ferrel.° Rd. Hackney London E8 UN Many 30L1 HF amp ow comet station Spare valves inely as new core £500ono. G4 IDE OTHR (Bos- thanks. (London) 01-254 9083 or 01.791089 • COMMODORE Amiga 500 computer 2nd disk Datong FL3 HF, VHF, beams, complete pkt station. ton) 0205 63454 • Ilsess ,coory ems. moto, generators, used to drive, printer and loads°, s ware. rie Word Proces- 401t lattice wove, mast Beale mounted cae rota- • PROFESSIONAL transistorised Racal comm supply pwr to 1154,55 aircralt transmatemcvr sor. Database and Spreadsheet. lar 2ra munimode tor plus aces. PSUs meters etc. Moving abroad row RA1217. 500kHz-30MHz. IF tillers. 200Hz. combinations urgently required to gel °them's° base station Worth. £600 approx Kns. GOLOH Realistic otters only. GODXC OTHR. (Southamp. 500Hz. 1.2kHz, 3kHz, 8kHz. A lovely 1 W with all completed installation airborne. Any into on pos (Haywards Heath) 0444 457202 after 6pm

RA DIO CO M M U NIC ATIO N October 1989 97 HELPLINES AELPLINESHELPLINESHELPLINESHELP EVENTSDIARY

The postman's been staggering down the road to We've never used one of these antennas so AMBIT DORCHESTER Headquarters with sackfuls of letters for Me can't really help - if you have and can. drop Mr A letter now horn BAS 42741. otherwise Mr J W CLUB NEWS He!elutes stall again this month: they've had to Harrison a line at The Red House, Staines Edghill - nice to see an SWL taking advantage 01 DEADLINE - Items for inclusion in the lay on special vans and the Potters Bar Green, Hertlord SG14 2LN or ring him on these pages Mr Edghill writes "t suppose I'm an Postmasters been pleading for mercy. Well, not Hertford 581476. DECEMBER issue must be sent to old codger, being now 85 years ot age 1 have strictly true - but many thanks to all who wrote in picked up in the local market an old sel made by HQ marked "Club News - DIARY" to with solutions to problems. useful advice and Ambit International called the 'Dorchester II'. I be received by 23 OCTOBER latest. handy hints. We've borrowed Seam of the latter HEATHKIT SB230 have managed to get II going alter a fashron, but Isr luau° an Practice' items, incidentally, so keep If news is received by the published Now an item sent m by Council member Francis the output is rather weak and the BFO does not an eye on that column as well as this one in case Rose, G2DFIT. regarding the Heathlet 56230 work. Is there anyone who can help me with a deadline, it will appear in the listing. It is anything you're currently wondering about (or linear amplifier. He writes -Parts for the S13230 *bun for this set? I will, ol course, pay any your responsibility to ensure that items struggling with) appears there. are no longer held in stock by Heathkit. One item expenses that will help In getting this set are sent DIRECT to HQ in good time. which people seem to need is the high-vollage working' We've never heard of the "Dorchester delay tube for the 8873. I have some; if anyone IV' ourselves but no doubt one of our readers News items should be sent in writing. CUBIC (SWAN) HF ANTENNA needs one t am OTHR'. For those who don't has • or maybe if anyone from Amba reads this preferably typed or written legibly, and MATCHING UNIT have a Callbook (subtle hint - they're only £7.95 they could have a look in their tilas and blow the be signed by the club secretary or the from Headquarters il you're an FISGB member) dual Oft any information they might have Meet,' To business, and a (track one first of all. Would Mr Rose is at 84 Cock Lane, High Wycombe, Mr Edghill al 51 Ernest Dnve, Maidstone. Kent person responsible for publicity. Me person selling the Cubic (Swan) HF antenna. Bucks HP13 7EA or on 0494 814240 ME16 00S. or telephone him on 0622 761327 matching unit on the bring-and-buy at Woburn on AVON 6 August please contact Kris Panridge. G8AUU. "Bath & DARC - Oct 11. talk: 25, constructors on 01.977 7325 or OTHR? CUBAN CISLS MAC-SHIPS compeletion: Nov 8.14F night on the air. "Bristol RSGB Group - Oct 30. AGM. HelpIrnes best DX so far came in this month In a "Anyone heard of MAC.ships"" writes Peter "South Bristol ARC - Oct A. computer and letter headed "Dear Mends , 73 from Ukraine. TRIO R300 RECEIVER Jackson, G3ADV, DI RAIBC. He says "They audio bring & buy evening; t I, ATV activity USSR" Al Kovalyov, UB511..A, passed on the tact were ahead-off tankers with an added eight-deck Secondly, very many thanks lo the three kind evenmg: 18. home brew • bring and display. that he is OSL manager for three Cuban stations to make Merchant »craft Carriers for convoy souls ¡Canon John Beaumont, G4JPB; Mr B 25. 20M activity evening. CO7HC. CM5VF and CM5JE. Al said that OSLs escorts across the Atlantic between 1942 and Rodgers. GIUOR: and Mr J V Phelps, G6DFMI ,Thornbury & DARC • Ocl 4, packet update - for these stations were only obtainable directly 1945 The ships were re-named Empire maccoll who wrote in with masses of material about how Flay. GW1FJI. 18. HF activity: Nov 1. amateur hem him: his address ro PO 130x 30, 340000 Empire MacKendnck, Empire MacCabe, etc. and to persuade the Trio R300 receiver to mod( on radio video. Donetsk, Ukraine, USSR. An SAE plus return had polyglot crews of RN, FAA. Army and the amateur bands. All three have sent the "Weston Super Mare Rs • Oct 2. talk "Around postage is required. One 1AC is good for surface Merchant Service personnel. They carried three inlormaton to Captan Coole. who originally the World in Less than 80 Days" by John marl and two IRCs for air mail, although Al said SwordIrsh biplanes each. If you served on one. requested it. and we've now got quite a lot on file Walker, GOJON: 16, constructors night. that he preferred $1 for air mail if possdate. please get in leuch with Peter Jackson. G3ADV. about the F1300 here If anyone needs any more Dela,Is 0934 514429. Hetplme's lame rs spreading, evidently • ell be at 32 Brown Avenue. Parklield. Nantwich. help. Thank you very much. gentlemen - nice to lea in the Kremlin for the Editor nex11 Cheshire CW5 7014 • rl only lo prove that they see the true amateur spiel is alive and well B EDFORDSHIRE really existed." Apparently Mr Jackson's Mends IBedlord 5 OARS • Oct 17, AGM Details dont believe a word el it! We've certainly heard 0234 266443. ol them, and ill remember rightly some ol them AKA! 1721L TAPE RECORDER TR1986 TRANSCEIVER IDunstable Downs RC . 28, RAE open From a sItie nearer home, Mr WA W Lankshear even carried Humcane fighters later in the war evening CIRCUIT writes "1 have recently acquired a Type TR1986 liShefford & DARC - Ocl 26. talk "What is On the basis that one good turn deserves 124.5-156MHz transceiver - as used, f believe, in NICAM"" by David Moore. another, can anyone now help Mr Rodgers" He arrcratt . and also a Dentsu Sedu electronic HISTORY OF MORSE asks whether anyone can supply a circuit keyer, Model DA -1 Both deem, have been Now here's an item for Morse ackhcts Mr Tony BERKSHIRE diagram for an Aka. 17211 reel.to.reel tape subjected to a certain amount of Side.cutler Gnggs, G4KLB. writes "I have been asked by a "Maidenhead & DARC - Oct 5, junk sale: 17. recorder and says 'All expenses refunded, arong surgery' and I should be most grateful to receive television producer lo help him research a talk "Berkshire Downs Repeater Group" by with lots of gratitude'. Sounds good - audiophiles. any informahon on either or both items." Nasty: programme he wants to make on the history at Chris. G4CCC: Nov 2, talk • "Rayner" by have a look in your pilules and see il you have anyone who can help with remedial work can Morse code. If any members have any Graham, G1CSF Delarls Maidenhead 25952. one spare Mr Rodgers' address rs 9 Hillcrest. wine l0 Mr Lankshear at 'Cedar Ridge. 57 St information, equipment or anything else ol Tawd Bridge, Up Holland, Lancs WN8 9.15. Georges Road. East Loon. Cornwall PL13 lED interest to this project. I would be gratelul il they CAMBRIDGESHIRE or ring him on Looe 2823 could gel mn touch with me at Dormers. Brent "Cambndge & DARC • Oa 6. wan to the Road East Brent. Highbridge, Somerset TA9 Linear Accelerator, Addenbrookes Hospital: SPERRY MAP DISPLAY 4JG" 13. talk "The Days of Spark" by Wilfred CONTACT CARDS Durrett. G3BYW: 20. evening in the shack Mr B Sayers, G81YK. has an interesting problem Morse class. 27. junk sale. Nov 3. evening in He says "rd like information which would lead to "Help - OSL Cards - was the heading on the next the shack. Morse class; 10, talk by John teller, from Mr E H Turner, G41RG. He writes the purchase of a "Sperry Map Display' which I FR-101 HANDBOOK worsnop, G4BAO ¡IBA) require in order to complete the restoration of a "Can anyone tell me how to contact Contact Now here's a good one Mr C R Chambers complete Sperry vehicle navigation system. Cards - a printing firm which had a stand al the webs from Movements Branch, HO BON. Nepal. CENTRAL NASA Mobile Rally earlier this year at Although likely 10 be rare. I'm told litai a number BFPO 4 where - as he says - 'signal generators. "Falkirk & DAC Meets every Wednesday al ol these units were sold through outlets in the 131aCkp001" They actually came from Blackpool oscilloscopes and clubbed radio engineers are a 7.30pm in the Guide Hall, Grangemouth. but. although t have a copy of the literature they south ol England late last year They consist of a bit thin the ground , He said that his Yaese FR. Details 0324 22442 green box approxrmately t6 x 1ex 3`,., and handed out at the rally. 1 can get no response to 101 has just spent seven months (i) with the "Shame & DABS - MeetS every Thursday al the telephone number or reply from their weigh about 14113." Mr Sayers promises us an Yaesu agents in Hong Kong and attire Yaesu 7.30prn on the Club Rooms, Bandeath article about the system if he can gel it all going • address. My particular 'Merest was that they had facrory in Japan being mended. During this Irmo. Industrial Est, Throsk, Nr Stiffing Details sounds great. From the photocopy 01 the piClure a lull stud.° with camera, etc, and were doing the someone managed to lose the FR-101 operating 0324 36235 which he sent in, it looks to us like a square box tales ' 'raised' print styles. My recollection was handbook Mr Chambers says this is invaluable with a map set in the lop, there's a Sperry logo in also that they were fairly reasonably priced*. smCe it has repair and calibration Instructions tor CLWYD Well, if you know anything about Contact Cards, the upper leh-hand corner II you can help. drop all the boards plus detailed Inlormation on the liConvry Valley ARC Oct 5, junk sale: Nov 2. Mr Sayers a line at 120 Birmingham Road, perhaps you could let Mr Turner know He's at 9 fundamental crystal frequencies and a host of talk "Satellite Oceanography" by Dr. W. Wallrnglorcl Road. Handforth. ReddrIch, Worts 1397 6EP other useful facts. He says 'Would you kindly Roberts Cheshire SK9 3,11 or on 0625 527834 insert in Helplines a plea for anyone who has "Delyn RC Oct 10. RAYNET • what is it? either a spare copy or who can photocopy an what do they do" can I help? find out in the MAIL232 original and would care to he!p inn out" We Daniel Owen Centre al 8pm: 24. First Aid by Someone somewhere must know the answer to MARINE HF ANTENNAS certainty would, sir • anyone got a manual for an Sr John Ambulance Service; Nov 7, talk and. FR-101 knocking about anywhere? Maybe SMC the nob one. Mr H W Hainsworlh, GMOIDT, Another DX letter came from Mr M HairLs, demo "Packet Radio" by Malcolm GW41E0. has a spare one somewhere in their emporium writes "t am experiencing great diffiCully ri GOHOC. who is currently exrled in Gibraltar He's Details 0244 819618. obtaining any information on the use of MAIL232 currently researching for a book A Gaffe to CHESHIRE for my Amstrad PCW8256 computer. No-one Small Boat Radio, which is intended to provide seems to know anything about rt. or if they do tin non-lechnbally.inchned readers with an BRIDGES TYPE 1863 AND 1852 "Chester & DRS Oct 3. committee meeting: only very vaguely. I would be most grateful if 10. talk "Intruder Watch" by Chris. G3TPY: introduction lo venous uses of radio afloat He'd Space is getturg a bit trght, so room lor just one someone could let me have detailed information 17, surplus equipment sale; 24, American like to hear from any regular 4.01M clatacomms more this month. Reaching Into the mailbag, it's or Tel me know of any beer% or literature on the video. 31. IBA users or those who have experimented vndely from Mr Ken Smith. G3JIX, who writes 'Help. Do subject which I may purchase." Write lo Mr with HF antennas an small boats. You can you think any readers melt have information on Hainsworth at 'Broad Acres>. 58 Claremont, Alba DERBYSHIRE contact Mike Hams via the UK Maritime Net on Caltel lest equipment - the Wide Range FK10 2DH. 14.303MHz between 0800 and 0900 or 1800 and Munsfield House ARO - Oct I. proposed bail Capacitance Bridge. Type 1863, and the Mutual to Personal Computer Show at Earls Court, 6, 1900 or by wnting co 96 Poplar Road, North & Self -Inductance Bridge. Type 1852? t have shack reran 13, quiz night: 20. a night of Common, Warmley, &blot B515 5JS been looking out at rallies, etc, lor Cintel reminiscences with Les. G3OZ and John. MAGNETIC LOOP ANTENNAS equipment but I have been unable to locate G42.10: 27, talk An Insight into Magic" by Know anything about magnel,C loop antenas', operating manuals or service rnlormation Ion Jack Skenchley, G6JPS Mr R L S Harrison. G3EPK (who signs himsell ihese items Any help or technical information FISHER TUNER-AMPLIFIER 'Puzzled') writes ' Having constructed a magnetic would be gratefully received' Anyone who can DEVON loop for 14-30MHz. my expenence is that il is help, wnte lo Mr Smith at Staple Farmhouse MODEL 234 1/Exeler ARS - 9. AGM about two S.points down on my G5RV - apart Staple, Canterbury, Kent GT3 I JX. "Looks like you're my last hope' writes Mr G "Torbay ARS • Oct 6. club night: 13, club from the time I contacted a ZSI who gave me Orange, GOOLO. He's looking for the circuit That's a for his month - keep wrarng' night; 20, monthly meeting lollowed by one S-point more on the loop than on the 511V. I diagram and an instruction manual for a Fisher "Between the Bands": 27, Club night: Nov 38 put eas down to a null in that direction on thin part stereo tuner-amphher Model 234. apparently 10, club nights ol the 5FIV Sanyo says the model is now defunct and can't Hotplates is designed to help put people in "I would be grateful for any comments horn help Anyone who can is asked lo wnte to Mr touch with each other_ If you have a DORSET other bop users, since t am greatly puzzled by Orange at 27 The Connery. Hucknall. problem, it's more likely there's someone out "Plessey Chnstchurch ARC • 12. talk "Latest the strength of EA3DJF's signal to me from the Nottingham NG15 7AH there who has the solution: it you are Developments in Electricity" by Rob. G6OUN Costa Brava. He rs 5 and 9 plus using 15W into a looking for an old colleague or amateur loopi He is operating from a block of Ibis about friend, there could be a reader who has EAST SUSSEX 150' above sea level. which I suspect may have some news of their whereabouts: if you 'Hastings E&RG -IL surplus amateur radio some bearing on his results, although the COPIES OF QST have solved a particular problem, write and equipment auction at West Hill Community antenna is supposed lo work well at around 2 While I think ol a, can anyone help HO" We're tell the rest ot us. 'Helplines' is there to help Centre, Croll Road, Hastings Viewing from metres above ground level. still sorting out the library and we'd like to know you and 10 give you the opportunity ol 7pm. sale 8pm. "For what it's worth. 1 get the best SWR with a whether anyone has a spare copy of the April helprng others. Witte to us marking your Faraday loop of about 6" diameter and about 6 1982 and November 1986 editions of OST. If you envelope 'Helplines' and well do what we ESSEX turns in feeder of the same diameter acting as a have, please contact Jim Smith. G3HJF. al can tO get the message Out liBramtree & OARS Obi 16, yls4 by Bob, choke.' Headquarters.

98 RADIO COMMUNICATION October 1989 EVENTSDIARYEVENTSDIARYEVENTS MARYEVENIb WARY ÉVENTSI)

G6AKL from Arrow Electronics. Nov 6. TIM N ORTHA MPT ONSHIRE JOTA/night on the air and Morse tuition. 27, G8BHE, tel 021.422 9787 "Chelmsford ARS - Oct 3, AGM; Nov 7. talk liNene Valley RC • Oct 4, talk 'What Makes night on the air and Morse tuition; Nov 3, Guy Ilandgend & DARC Rade Rally - Bndgend Fawkes supper; 10. night on the air and "Sporadic E" by Jim Bacon an Archivist Tick" by Miss R. Watson. 25. talk Recreation Centre. Angel Street, Bndgend. Morse tuition ILoughton 8 OARS • Oct 6, HF night on the "OSCAR" by R Limebear. G4R WL. Nov 15. Micl.Glamorgan. Doors open I lam. Details air with G4ONP. 20. the Essex Data Group home brew contest 'Midland ARS • 17. AGM GW4YKL. tel 0443 226198 or GW1OUP. ICI - Roadshow. Packet Radio demo by Malcolm ',Solihull ARS • Oct 19, AGM; Nov 16, surplus 0656 723508 Salmon. G3XVV and Dave Castle, 6600J, NOTTINGHAMSHIRE sale. 26 NOVEMBER Nov 3. talk "How Not to Write Computer aeic or Nottingham • Meets at Sherwood Programs" by John Short, GIDJI WEST SUSSEX I'Verulam ARC Chnslmas Rally • St Albans Community Centre, Mansfield Road. Details Details Hilary G4JKS tel 0727 $9318 Trade horn Alan. G7D11.144 Nottingham 390474. 5. "Horsham ARC • Oct 5, Autumn junk sale. Nov 2. talk "Antenna Modelling" by G3LDO. GLOUCESTERSHIRE torum, 12, talk "My DXing Shacks" by Dave. bookings, tel Watford 52959. (Date changed "Gloucester ARS - 4. TBA from 3 December) G3YUT: 19. homebew evening, 26. junk sale WEST YORKSHIRE GREATER LONDON ORKNEY IDenby Dale RS - 18, visit by Lowe 10 DECEMBER "Acton, Brennen:1 & Chiswick ARC . 17, Electronics oh Matlock. 8.30pm at Denby Dale l'Orkney AR Group • Oct 4, talk and slides I/Leeds & OARS Christmas Rally - PudSey members* holiday reports. Pie Hall, tot a demonstration of equipment and Civic Centre. Dawsons Corner. Pudsey. nr -Annals for DX". Nov 1. video 'Melbourne discussion Light refreshments available 'Southgate ARC Oct 26, inlormal meeting. Radio Club" Leeds. Details G Stubbs, tel 0532 585801. Nov 9. construction contest judging night lor tiHalitao & DARS • 17. Lowes • Club demo the G6Olvl trophy OXFORDSHIRE liKeightey ARS - Oct 3. planning meeting 25 FEBRUARY 1990 special event: 31, junk sale. Nov 7, night on Wino 3rd TAW & Torridge Rally BAAC Hall. ',Wimbledon & DARS Oct 13, AGM; 27. "Geoid & OARS Oct 12 & 26. club nights. surplus equipment sale. Nov 10. talk "Fibre Nov 9. club night the ami GOKRS. &dotard, Devon Doors open 10.30am Trade Optics" by Paul Matthews, G4AWZ. INorthern Heights ARS • Oct 4. talk stands. bring & buy, bar, refreshments, talk-in SHROPSHIRE Electronics in the Fire Service" by G S22 Details: GOGFK 02372 76402. GREATER MANCHESTER Barbour, G8CHN, 18. visit to Fire Service HO, "Telford & OARS • 4. UHF on the air. Details 4 MARCH 1990 "Eccles & DARS • Oct 1. talk -Achromatic Telford 770922 Nov 1. talk "Fax and Other Data Modes" by Separated Lenses" by GdUOT. Nov 7. talk Jack Birse, G4ZVD ',The Great Northern Rally (Trenton' Rally) - "MegaStream Data Lines" by G6MEI SOMERSET 110tley ARS • Oct 3. talk and demo by Trevor G-MEX Centre. Manchester. Morse Tests "Stockport RS • Oct I I. G3FYE Memorial 11Yrov,1 ARC - Oct 5. video night, 12. talk Brown, G8CJS, 10, night on the air, IT. lark Debts Graham, GI IJK let 061.748 9804 Lecture. TBA. 25. talk "Police Work' by WPC Impedance Changing" by G3MYM. 19. tali. Contest and Fieldwork" by Chns Knight, GOCFK; 31, latir and video "International 9/10 MARCH 1990 Chnstine Russell tom Me Community Contact "Oscillators • by G3MYM; Nov 2. RSGB video. Department, Nov 8. talk "ORP' by Rev Maritime Satellite Communications" by Mike "London AR Show • Pickets Lock Centre. George Dobbs. G3RJV SOUTH GLAMORGAN Fox, G8EWH. talk "Regulatory Matters oh Pickens Lock Lane, Edmonton. Lo don N9. Satellite Communicatoon" by visitor from BT Details and advance ticket sales 0923 "British Telecom (S. Wales District) ARS It, International, Nov 7, night on the air GWYNEDD visit to British Rail Communications Centre. 678770. "Todmorden & 3. junk sale. Nov W eirton ARS 'CHANGE Now meets Wester f. near Bristol oAris • Oct 6. talk "Sun. Earth and Radie" by Gordon 11 MARCH 1990 7.30pm tal Thursday in month at she. Hotel, "Cardin RSGB Group • Oct 9. AGM and thing Dolgellau Details horn Mr B.E Adams, G3LEO. M esh Mobile Rally - Barry Leisure Centre. & buy sale; Nov 13. talk -Power Supplies • A off Horton Road. Barry. South Glamorgan. GW4KDP. 10 Heel Meren Barmoulh, LL42 ro Z"' by Roger Alban, GW3SPA. Details ILA WILTSHIRE W aits GW6RCK 04463 3212 IBlackmoie Vate ARS Oct 10, tunk sale, 24, HA MPSHIRE SOUTH YORKSHIRE G4RBV club station on air; Nov 14. talks 1 APRIL 1990 "Basingstoke ARC - Meets list Monday 01 "Safety in the Shack" by Dave. GOG WC and IPoniefract & DARS Component Fair 1990 at Isarnsiey a DARC • 9. rig check night with month at 7.30pm on Forest Rings Community COCOA: 23. on the air natter night "Fillers" by Steve. 61210. Carleton Community Centre, Carleton, Centre. Winklebtay and additional meetings at Pontefract Fort Hill Community Centre, Winklebury Oct STAFFORDSHIRE W hite Rose Rally • Leeds University Details G4DXA. PO Box 73, Leeds 1St 5AR 2. AGM. 16. talk -Basic Electronics • Part 2' 'Stafford & DARS Oct 10, night on the air: by Steve GOJSR, Nov 6. constructors' 17. FISGE1 videos "Amateur Radio's Newest MOBILE RALLIES 8 APRIL 1990 competition Details 0734 332777 Frontier" and "Two Pioneers of Radio". 24, Wareham & DARC - Oct 11. talk and demo members' construction night; Nov 14, night on This is a list of all rallies, exhibitions liCambeidgesbie Repeater Group Rally and -The TONI Tuner" by Brian. G41TG and Mick. Junk Sate•Auction Details GOHEM (OTHR) the air Details 0785 662350. and conventions notified to HO (as at G41TF: 25, talk "Home Brew VHF Comms 'Launceston ARS Rally al Launceston Receiver' by Andrew. G4XZL. Nov 8. talk STRATHCLYDE press date). Items are given in detail College Details from Maggie on 040921 219 or Rodney & Joy on 0566-5167 "The Siskin Electronics Nee" by Phil. G6DLJ "Cunningham & DARC •'NEW CONTACT' for the next three months inclusive and Details 0705 321411/2 (Daytime). John McCreight GM3DJS. 40 Auchen Hanna in brief thereafter. Please send detailed 13 MAY 1990 "Farnborough & DARS • Oct It annual Road, Saltcoats, Ayrshire, KA2I SRL Tel information, Including contact callsign 'Southend & DARS Mobile Rally at Roachway construction contest; 25. TBA, Nov 8. surplus 0244 602464. equipment sale Details 0252 519773 'Greenock & DARC Now meets 7pm and telephone numbers direct to HO Youth Centre, Rochloid. Essex Details from John Stone, GODFE on 0702 202216. "Three Counties ARC • Oct 11, members Tuesday and Friday. Details 0475 25075 and marked 'Rally News • DIARY'. "Yeovil ARC 61hORP Convention Details activities. 25. talk "Mobitt Radio Or Order and IHetensburgh ARC - 'NEW CONTACT' Barry GIMNM (OTHR) Safety" by Ron, G3F0P. Nov 8,1itrn night Spinks, 9 St Andrews Crescent, Mansewood 1 OCTOBER HEREFORD & WORCESTER Estate, Dumbarton. G82 3AR IBlachwood Amateur Radio Rally • Oakdale 10 JUNE 1990 'Kilmarnock 8 Loudoun ARC - 'NEW Community College, Blackwood, Gwent "Hereford ARS • 6. talks ''Fox Hunting- and CONTACT' John Hemphill. GM3CTG. 31 12151 Elvaston Castle Mobile Radio Rally, Doors open 10.30am Dealers stalls, fame, "Rayner by Tony Hartland, G8WOX: 20, talk Dundonald Road, Kilmarnock, Ayrshire. KAI Elvaston Castle Country Park near Derby. and slides "Expedition to Steetholm Island' by refreshments. talkm etc Details Bnan, Details hom John, G4PZY on 0332 767994. IFIL1 Tel_ 0563 25312. GWOJWF OTHR. Grant Cratchley, G8ILI (Provisenat) Both at "West oh Scotland ARS -'NEW VENUE' Now Three Counties Training • Cattle Market Nov 'Great Lumley ARES Rally - Great Lumley 24 JUNE 1990 meets al 29 Old Dumbarton Road. Glasgow Community Centre, Chester-le•Street, 3. annual junk sale al Club Headquarters in Details from Patricia MacKenzie, Gmtwetv "City ot Bristol Group 33rd Longleat Amateur Co Durham Doors open 1 lam (10.30 for Gaol Street PO Box 599. Glasgow, GI 1EW. Oct 6. Radio Rally, Longleat Park, Warminster. Wilts disabled visitors). Trade stands, book stands, Details Shaun O'Sullivan. G8VPG. tel. 0225 illustrated talk -Loge Baird - The Continuing HERTF ORDSHIRE bring & buy. refreshments. etc. Entrance lee 873098. Story" by Dr Peter Waddell; 27. talk "Basics 50p Details Barry. GIJDP tel 091.388 5936 liVerulam ARC 24 interefub contest "Great for Home Constructors" by Peter. GM6SHB, Erg Race" Nov 3, talk "Repeater Mystique' by Jon. 8 OCTOBER GMOHYY, 10. talk "COX,W6 & wr by Jack_ "Armagh Rally • Druinsill House Hotel Details OTHER EVENTS LANCASHIRE JA Murphy, 18 Ogle Street. Armagh City. "Fee ARS Oct I 2.1ark ' Space Exploration SUFFOLK Co Armagh, let 0861 522153. alter 5 30prn in me 1990s ' by Peter Sullivan; 26. Informal; ',Felixstowe & DARS - 9. Orwell Park School 1 OCTOBER Nov 9. equipment sale Special Event planning. 27, (Friday prni 15 OCTOBER IRSGB HF Convention • Beery Hotel. Milton 'Thornton Cleveleys ARS - 2. talk "Winding evening) preview 01 new Club Station "Bishop Auckland Radio Rally - Leisure Common, Oxford. Doors open 9.30am. Cods" by Jack. G48FH. 9. talk "Electromag- (Governor's Day). Orwell Park School. Centre, Sholdon, Bishop Auckland. Bring & Admission £.50. All the usual RSGB netic Compatibility" by Ian MacDairmid; 16, Naclon: 29, official opening of new Club buy, refreshments elc. Admission tl am Committee stands, presentation of trophies. AGM. 23. talk & demo "Packet Radio" by Ray. Station, Orwell Park School, Nectar' Details (10.45 or disabled visitors). Details Ernie. Young Amateur of the Year Award, full lecture G4YVO 0473 642595 (daytime). G4TYF. tel 0388 607500. programme Details: Martin Atherton, 0223 Illiornsea ARC ELOEX 1989 Rally Doors SURREY 424714 LEICESTERSHIRE open 11 am (10.30 for disabled visitors). "Flight Roluelling ARS • DF hunt in the >Guildford & DRS • 13. talk My CRO W 'Leicester RS - 2. quarterly progress, open Details Jell, G4IGY. lel: 0964 532874 Purbeck Hills Processor. 27, the club archives "A Look meeting. 9. committee meeting, HFIVHF Milton Keynes & OARS 3rd Amateur Radio Back in Time" activity night. 16. talk -Amateur Radio Car Boot Sale al Cranheid Airfield. Beds. 21/22 OCTOBER "Sutton & Chnarn RS Oct 20. 'tunk' sale Satellites" by David. G4CUO. 23. final Admission 10am. Bar & refreshments Talk in Klamboree on the Air preparations Or Leicester Amateur Radio on 522. Details Mike. GOFMC. tel 0908 Exhibition. 30, RSGB video WARWICKSHIRE 566796 or Tony. G6WXM. tel. 0908 316435 22 OCTOBER IMid•Wanvickshire ARS • Oct 10. talk "These INunsfield ARC • OF Hunt (Round Two). Things do Happen , by Don, G8HRI: 24. talk 4 NOVEMBER LOTHIAN The World ol Computers' by Andy. GOA.J8; 119in Norm Devon Rade Rally - Bradworthy 'Lothian RS Oct 11, call my butt. 25, talk 27-28 OCTOBER Nov 14, RSGB Video Night with Malcolm, Memorial Hall (near Holsworihy), Admission "Women in Radio" by GM6KAY. Nov 8. junk 'Leicester Show • Granby Halls, Leicester. GOGLU. 10 30am Stele & buy stand etc. Tal in on 2 sale. 7.30pm at 'Orwell Lodge" Hotel Doors open 1000 (0930 or disabled visitors) ISIradord upon Avon & OARS • Oct 9. talk metres (522) Details G8MXI (OTHR) Potwarth Terrace, Edinburgh until 1803 each day Admission I. This is the "Ham Radio Around the World' by Les biggest show ever held at Granby Halts Hickingbotham G31420; 23, Repeater Group 4/5 NOVEMBER RSGB stand. Details Frank Elliott. G4PDZ, MERSEYSIDE talk: Nov 13. practical projects evening. Mo e Wales Amateur Radio & Electronics 0533 553293. Il pool & OARS 3. AGM Rally • Abeiconwy Centre, liandudn0.0FerIS WEST GLAMORGAN am both days with talk in on S22 and 70cm 10 DECEMBER N ORF OLK 'Swansea ARS • 5. talk and demo Details Sep. GWODYH, gel 0492 517875 "Coulsclon ATS Annual Bazaar at 4th Purley INortalk ARC - Oct 4. talk "Radio Navigation "Computers in Amateur Rade" by GW4KAW (evenings/weekends) Scout HO, Lion Green Road, Coutsdon Systems" by Malcolm Prestwood. G3PDH. and GWtYSJ. 28, 53•seater coach lo Bookings for Ilea market tables must be inlcumal & committee meeting. 18. talk News Leicester Show into horn Roger Williams, 19 NOVEMBER rece'ved by Wednesday 15 Nov. Details 01- Gathenng by the RSGB" by John Nelson, GW4HSH. tel 0792 404422 "West Manchester RC Winter Rally - Bolton 684-0610 GW4FRX: 25. inermal. Nov 1. talk -Project Sports & Exhibition Centre Details Dave. YEAR" by Victor Brand. G3JNB, 8, surplus WEST MIDLANDS 61 '00 tel 0204 24104 evenings. 1 APRIL 1990 equipment auction,ding & buy. (Doors open "Coventry ARS • Oct 6. AGM; 13. night on the 'Midland ARS - Birmingham Mini-Mobile Rally IHAFIU Region 1 Conference starts - 7pm). Details 0508 78258 air and Morse tuition. 20, preparation for • (Venue to be advised) Details Norman, Torremolinos. Spain Details G3FKM.

RADIO COMMUNICATION October 1989 99 EVENTSDIARY

12 OCTOBER GB CALLS IGB2SBS SEVENTH BRACKNELL The list below shows all special event SCOUTS G4RNU stations licensed for operation during this month (as at press date). It is 13 OCTOBER taken direct from the GB Calls file on leGB2RCC RADIO CARAVAN CAMPING the last... G4EPN the HQ computer. These callsigns are valid for use from the date given but G-PLATES - A WHILE YET DTI. Correct me it I am wrong, but may 14 OCTOBER the period of operation may vary from I do not normally bother the Society with not a certain anomaly arise with regard lo 10GBOrOi R lot AIRSHIP the future position of the Class 13 licence 1 to 28 days. The callsign in GOGEU letters, being one cl the majority of parentheses is the source for further members who are very content and holder who, at the end of the day, would appear to have less access to the radio information. grateful for the work you all do for us. But 15 OCTOBER I must write and say how much t would spectrum than the Novice. I refer in bGBICOX COASTAL DEFENCE 'X' appreciate it if you can arrange for us to particular, of course, to the fact that the GOJBU 1 OCTOBER be able to have *G' licence plates for our Novice will almost certainly have access. 11GBOCDZ COASTAL DEFENCE IIGB2WF WALTON FIRS albeit limited, to the HF bands. G4ZPV cars. In my opinion the vast majority of STATION Z G3LXW Considering that the Class B Licensee 11GBOEWC EAST WICKHAm CUBS 11GB6COY COASTAL DEFENCE -V members will be very glad to have this has already completed a full•blown RAE GOAHI GOJBU facility, though of course there a school I1GBORRA RED ROSE AWARD who will decline on the grounds that it course in theory and practice and the GOJBR advises potential burglars of one's Novice Licence is, among other things. a 20 OCTOBER bGBORRR RED ROSE RALLY absence from home. A very valid point I stepping stone to a full A or B licence, GOJWU IIGBOPGS PENKRIDGE SCOUT GROUP then surely the Class B licensee may GOAOJ am sure • but that, of course, is up to the bGB1SFW FIRE SAFETY WEEK GI YIY have a legitimate complaint'? ›GB2BUS BUS MUSEUM 11GB2JAM JAMBOREE individual member's judgement. GOFOI G4UDR Reading the press on the topic of the I should like to know if the RSGB have IrGB2NCC NORTHUMBERLAND PG041-CS FIRST COULSDON SCOUTS cost of specialised number plates it is considered this matter. COUNTY COUNCIL GOACR G6HC horrifying to see the prices asked by the Mr H Gilchrist. GMOEWK I1GB4RRA RED ROSE AWARD 1608SMG ST MARTIN S GROUP specialist dealers in the Sunday papers. At a recent meeting with the DTI. we GOFRL GwILOR Hopefully, as there is no competition tor a proposed that holders of the Class B IGB4FIFIS RED ROSE SILVER licence be granted a Novice Licence on GOIZR callsign plate. which is only saleable to 11GB6JST JUBILEE SAILING TRUST 21 OCTOBER one person. the DOT will charge a passing the 5wpm morse test. A formal GOJSC 11(834HMS HER MAJESTIES SHIP reasonable price. I would consider response is awaited - Ed. bGB6HEY KNOWSLEY HEY SCHOOL GOERS something in the order of £50-£100 as G6IMJ 11GB8BS BICNACRE SCOUTS reasonable and such a price would I am DX LIKES TO WORK DX G42PE IIGELEIRRG RED ROSE GOLD I noted with considerable interest the 01100 11GB800 BOO YEARS NORTHAMPTON sure, bring a massive response from CHARTER members. If goes without saying that I article by G3SXW about his recent G4SVx would expect the RSGB to collect a DXpedition with G3TXF to the Gambia. I 2 OCTOBER commission on each sale' particularly like the paragraph about IGBOCSR CIVIL SERVICE RADIO t wish you good luck with the DoT and "cracking the pile-ups" - this is sound 25 OCTOBER G3XWK look forward to hearing of a positive advice to anyone wishing to work DX. IIGB4CPU CENTRAL PROCESSING UNIT result in the near future. particularly the expedition stations GoCOB 11GBOCOD COASTAL DEFENCE D' operating from really rare locations. May I GOHCZ Once again, thank you for all you do 116820PS ORwELL PARK SCHOOL lor RSGB and us members. add the following, written from the point 3 OCTOBER G4Y0C 0 Roberts, G3FKH of view of a resident DX operator? bGE34xxx X NETT DXPEDITiON bGB6CDV COASTAL DEFENCE Following a visit by the Secretary. David Hong Kong isn't all that rare these G4iPx VENTNOR GOHCZ Evans. to the DVLC at Swansea. we are days but the appearance of a VS6 on the now able to give a clear indication of bands can spark off a pile-up given 4 OCTOBER 27 OCTOBER whether and when "G" cal/sign number. reasonable conditions such as we have IGBOJST JUBILEE SAILING TRUST IIGB4SPC SCOTTISH POLICE COLLEGE plates will be available. been experiencing recently. For those of GOJSC GM3MTH In short. the 'bad news' is that, owing us who are 'resident DX' this can be a to ¡he time needed by the Government to pain at limes • even the DX likes to work 5 OCTOBER implement the necessary legislation, DX occasionally. so please listen 1 NOVEMBER IGBOTHS TIMOTHY HACKWORTH there is no likelihood of such a facility carefully and if the DX station is looking 11G134BTS BRITISH TELECOM STONE SOCIETY G3LUC being available during the currency of the for a specific area, and you're not in il. 11G82LBP LORD BADEN POWELL G4JKF 'G' series of number plates. Radio then do not call him. Wait and keep G3YBO IG134RRG RED ROSE GOLD listening • you'll probably gel your chance 11G132USJ UNIVERSITY SILVER JUBILEE GOFRL amateurs are not the only ones affected: GOJHG 1036FIRA RED ROSE AWARD several other organisations are keen to sooner or later. 1/GBoxXv 251H ANNIVERSARY GI TAR see the promised 'liberalisation' of When I'm working a pile-up t quite bG136FIRG RED ROSE GOLD BRISTOL ARC G3ZKI number plates get under way and are often use a wide CW filter, so calling a G1AKN similarly frustrated. little off my frequency is likely to achieve The 'good news', however, is that results when everybody else is spot on 6 OCTOBER 3 NOVEMBER zero beat. I've worked stations al S3 who bGBOFOH FRIENDS OF HIGHFIELDS things are not liberal enough yet for GWOGHC bGB2RCC RADIO CARAVAN CAMPING single numbers to be included on used this tactic when I was being called 11GBOHAH HEWETT COMPREHENSIVE G4EPN registration plates so you won't see by others al S94,. These weak signals SCHOOL GOKWP )G11411SL ROYAL SIGNALS LLAN anyone else with your cal/sign on his or could never have made il on SSB - DUDNO GW4XKE IGBOSBW SAW BRIDGE WORTH her car, nor will you have to buy would-be DXers please note. OK. I admit G3UEG someone else's Rolls Royce in order to I'm biased as I never use SSB, but I've 11GBIGJ GOLDEN JUBILEE 4 NOVEMBER found a mode that could better CW for M AL slap his plates on your moped. bGB2MCW METHODIST CHILDRENS IGB2CDO COASTAL DEFENC KT Once the legislation is in place. which weak signal work and that includes the WEEKEND G3MNL GODHZ may take a year or two, the DVLC is SITOR I used during my time as a radio IIGB4ORS OUAINTON ROAD RAILWAY bGB2CS8 GLEE VE SCHOOL BIZARRE likely to ruila number of pilot schemes to officer in the Merchant Navy. GOLRI STATION G4PSH test the effects of liberalisation. Ours There has been some discussion of IGB6FIF HOUGHTON FEAST could well be one of these and, on the the OSL situation recently lollowing GOABF 11GB6OBC OPEN BIRTHDAY CAMP 6 NOVEMBER lace of it. there is no reason why 'G' G3DRN's article a couple of months ago. G7ELC bGB2PPC PRIOR PARK COLLEGE plates could not be transferred to any car My policy is to wail unlit I receive a OSL G3lvw manufactured alter 1.8.89. Note that. before I send mine, so it you don't collect IG134RSL ROYAL SIGNALS LLAN- cards just don't send me one. I think DUDNO although you can make a car look older 7 OCTOBER by using an old registration. you are not most of us active from VS6 work this way IGBOCOL COASTAL DEFENCE GW4XKE permitted fo make it look newer. since sending out a card for every OSO GODHZ gets expensive after a while. ›GBOCEL COSSOR ELECTRONICS LTD There are no indications of the cost of 8 NOVEMBER GOBKL such a scheme or exactly how it would Finally. for 18 and 24MHz fans. VS6 IGBOERH EAST RIDDLESDEN HALL bGBOTAC TRANS ATLANTIC CABLE work but we are continuing to press for it operators now have access to both GOKI3T GOBBE and will be continuing to liaise with the bands, but our power output is limited 10 IGB2APC ALNIONDBURY PARISH DVLC. - Ed. 10dB. CW only, and antennas must be CHURCH GOGOJ horizontal and have no gain over a bGB4EKG ESSEX KITE GROUP 9 NOVEMBER IIGBOXXV 25TH ANNIVERSARY dipole, œ the same restrictions that used GaYTG CLASS El I/ NOVICE LICENCE IGB4LB ROYAL NATIONAL LIFEBOAT BRISTOL ARC G3ZK1 Congratulations on the series of articles to apply in the UK. I've worked into iNsi GaPu in September's issue under the heading Europe quite easily on 24kHz and have worked several G. GM and GW stations. 10 NOVEMBER In Practice. I believe this kind of material but where have all the GU. GJ and GD IIGEMWMF WEEKS METHODIST will be of great value to the home 8 OCTOBER and GI stations got to? IGEIOJDC JAGUAR DRIVER'S CLUB FESTIVAL G4BKE constructor who, all too often, even alter Mr B C Kates, VS614111 GOGOF consulting textbooks, finds himself unable to solve a particular problem. 18 NOVEMBER I am glad that the Society's proposals MY FIRST WARC RTTY OS O bGB4HMS HER MAJESTIES SHIP 10 OCTOBER for a Novice Licence have now reached Resulting from your special feature article IGLIONWR N WALES RALLY GWODSJ GOERS the stage of direct negotiation with the in July 1989 RadCom • Working the

100 RADIO CO M MUNICATION October 1989 WARC Bands by Bob Whelan, G3PJT - I Having travelled for many years into from that country with great pride as the Fairs Christmas Bazaars or set up a was indeed inspired to 'gel going on 18 highly sensitive areas carrying radios. ARRL recently confirmed to me that it is station for the scouts,gindes, or has and 24MHz recording equipment and computers. I am the first and only CS DXCC issued to a GlZ1H and his friend visited or contacted Fortunately my full size G5RV antenna reasonably 'amber with the problems to 9G1 station - maybe there will never be every pack, troop or company in their tunes up very nicely on 18 and 24MHz be encountered al airports and fell that another one , area? It should be noted that both scouts and t very soon got going as encouraged. the article was slightly misleading in that The point that I am trying to make, and and guides have badges associated with However. I feel it worth a mention that a 'Customs' was confused with security'' throw out for comments by members, is amateur radio. re Communicator and 'special' for me was my lest RTTY Generally speaking Customs only that unless country societies such as Radio Communications respectively contact on 18 and the unqualified mutual become involved alter landing, and do RSGB and ARRL and, more particularly Many leaders would welcome such a pleasure in RTTY OSO with Feliz. CT1HB not care too much whether or not your the IARU. make proper representation of contact. on 22 July will be long remembered We box of shiny knobs will go bang las long our hobby to such countries then the list I appreciate that Amateur Radio is an were both so excited that a few keys as it happens outside the Customs Hall) - of workable countries will go into a insular hobby with much of the equipment were undoubtedly hit in errorl they are only interested in whether you steady decline Don't be fooled by any static, but the use of mobile and I enclose my valued OSL card from bought your box of tricks on your holiday/ DXCC lists if you erase the Countries handheld equipment must make going to CT1HB for you to see_ business trip or in Me UK and have paid which do not issue licences it will reduce meet these young people easier? What Mr S G Caspercl G3XON VAT and duty. In this case it is always in length by a considerable amount. would be better than gelling the advisable lo either obtain a carnet before Given the above and referring to the youngsters involved with rigging up a HELPLINE GRATITUDE leaving or at least, carry the UK receipt opening paragraph. how can we possibly temporary aerial and then going on the I had a wonderful uplift in receiving quite with you to prove the point, especially if it expect our own young people to become air? Our entoyment of our hobby must be a number of very helpful replies to my is a large new-looking radio. or whatever. interested in Ouf much heralded 'World demonstrated and made obvious if recent plea for help regarding a micro dot and can save untold frustration, Wide hobby when unfortunately il is not , anyone is to be equally enthused terminal unit programme f hanks again especially if you encounter an official with D S Radley, G40181 My focal club. Yeovil ARC, put on a Mr L S Gumbo''' G2BAH.. an ulcer or a nagging wife! Computers display every year at ray schools pose a different problem and professional Summer Fete and then leave Ille WATERPROOFING COM- W6HPH L-METER advice should be sought before taking equipment for us to use the next week POUNDS I read wer interest G3FDG's modification that expensive tap-top out of the country when pupils are encouraged to get I submit another contender lar the of my L meter circuit in the June 1989 Security is another matter entirely. involved with any activity-hobby that the ultimacy in waterproofing materials RadCOm They will be very interested to find out school can otter. This is knitter propounded by Arthur Tait (GM4LBE) in It is standard practice to use two whether the grey box will play a tune or supported by some of the club members The Last Word earlier this year. his silicon diodes to tie together the bases 01 emit smoke. before allowing you onto the giving practical and theoretical help 'Denso tape' which is a petroleum mastic a complementary output stage such as plane, so removing the batteries is not a during the week and organising the compound carried on an open-weave shown below. The two emitter to hase good idea I have frequently been asked. special licence, videos and tapes All nyton fabric. In the same wild environ- Junctions in series require a forward bias to turn on my radio to prove that it is what pupils enjoy and remember the ment that GM4L8E inhabits I have used equivalent to two diode drops. It only one it purports to be Scrabbling for batteries experiences gained. It is nol only my MIS material with complete satisfaction silicon diode is used the two series in the shadowy depths of your holdall, school that benefits by this type of for many years for the weatherproofing of transistors will not be turned on, with a resentful crowd behind you. is not contact but others in the area as well ordinary connectors such as the P1259 quiescent current will be zero, and cross- an enviable situation to be in Perhaps we are lucky having such a type, and of other outdoor electrical over distortion will result. Furthermore, Mr J W Thexton. G3URE friendly and helpful local club? furniture. 'Denso tape protective temperature compensation will be Yeovil ARC also offer a small prize for covering on exposure to the weather incomplete with only one (lode. the best coursevvork in the local area THE SHRINKING WORLD gradually assumes a stiff and durable If collector current is excessive as which has an electronicsladio content In recent years we have read much about texture. 11 is easily removed when it is G3FDG found it to be, it can be reduced This is organised through the local Heads the decline in amateur radio in the United necessary to open the Joint. 'Dense by Increasing R1 in the diagram below. of Science. Kingdom and lack of enthusiasm from the tapes are commonly stocked in 10m rolls This writ unbalance Me output stage bet We have to go out and attract the younger generation to toin our hobby. in widths up to 300mm by builders balance can be restored by increasing As an expatnate amateur f would like young people to our hobby which can merchants only be done in a practical manner. the value of R2 to make the DC output to air my views on what t perceive to be a JA Young, GMADOD G Mrddleton, G6EER voltage exactly half the supply voltage. much more serious problem and indeed G3FOG also had trouble getting full one which will help to aggravate the oscillator output on the highest frequency already serious problem 01 attracting GETTING YOUTH INVOLVED MANNERS MAKETH HAM range This will not be a problem if a high 'new blood' into amateur radio. It is the I am writing to support tire comments and nayo now tyccorne sckened disgusted 0 coil as used for the 500 microlienry ever shrinking world of amateur radio, suggestions put forward in the February by the manners or lack of manners shown by European stations when trying inductance. A high ()coil is required pnmanly caused by bureaucratic red tape issue of -Last Word?' by G4NZK and because of the high L to C ratio. and more often or not a complete lack of GlZIH to work DX Over the past few years the Mr F Brown. W6HPH understanding of our hobby by many in order to involve your people more in problem has grown out of all proportion governments around the world. As an Amateur Radio surely we as amateurs As an ex 9J2 I had my share of 'pile ups' expatnate amateur I find that it is often must get moro involved with them? on CW and SSB In those days 1968.1975 virtually impossible to obtain a licence Schools would present the largest and only a few guys caused a problem. indeed in many countries, and even easiest point ol contact and this should mainly LI. HA and YU calbng nie while in indigenous would be amateurs are unable be done on a personal basis rather than OSO with another station The disease is to obtain the necessary permission to lust writing to the school It is not always now spreading rapidly. It is now operate. known within a school if there is a impossible to give a directional call to. As I sit here in Sudan listening to the member 01 staff interested in amateur say G or USA without getting hall of HF bands how I wish that I could load up radio and where any mail should be Europe replying and being insulting if you and send CW de ST???, but alas t am directed. A good place to start might be do not reply. Working a JA or USA pile up unable to and the same goes for the last the Head of Science, although not all presents no problems. If someone steps two counines which I have lived in • teachers interested in radio teach Out of line. he is quickly told by his own Greece and the United Arab Emirates. In Physics or Technology II teach country to OAT Europe NO! They fact it has not been since 1976 when t Mathematics). If, however, no-one within argue and tight on the air. until the DX GREY EXPORTS proudly signed as 9G1GE that I have the Science Department is interested the station quits_ Recently a group of ZS Having read the article by Bob Treacher been able to operate without any letter may be discarded. Has anyone hams put 7P8 on the DX map for a few in the last RadCom concerning taking bureaucratic hindrance. Sadly you won't thought about contact with the Modern days One operator a YL. eventually took radio equipment abroad t would like to even hear a 9G1 these days as amateur Language or Geography Departments? oft the 'cans' threw them across the room clarity two significant aspects of his radio is no longer allowed in Ghana. I Have other radio clubs pul on displays and refused to operate I myself have therefore hold on to my CW only DXCC at their local school during their Summer been called"ZS5LID - and'IS5FU - when trying to OSO a station purely because t did not acknowledge some clown with 2kW and a lousy signal who smashed up the OSO. It would be interesting to get the views of a few regular DX operators y on their views of the worst operators. My iihjeew, 14 ^e , crie own list would be LZ. YU. Italy and HA redio Oel 0..ttrkij ckij This letter was finally prompted by a "GO" who called me incessantly tonight while t like OviS ? Ouilat -{o be was in OSO with another "G- When I did cut enioj the Set-LS/tea! not reply he turned up. waved his carrier about and then made insulting remarks Oieef Sorry chaps , but maybe this is why il lakes so long for you guys to get DXCC. The DX stations do not want to know D Sargent. G3SXZ

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INDEX TO ADVERTISERS — OCTOBER PRACTICAL WIRELESS Allweld Engineering 68 Klingentuss Publications 68 and Amcomm of London 77 KW Communications Ltd 54 SIIORT WAVE MAGAZINE AMDAT 70 Labgear Ca blevision 102 are looking for a Argus Books 91 Lake Electronics Ltd 92 ARE Communications Ltd ... 30, 31 Lee Electronics 65 Arrow Electronics Ltd 71 Leicester Amateur Radio B Bamber Electronics 93 Show 25 Technical J Birkett 88 Lowe Electronics Ltd 26, 27 & IFC Blue Rose Electronics Ltd 92 Mauritrom Electronics Ltd 90 Bredhurst Electronics Ltd 76 Navico Ltd 51 C-Fane 76, g0 Nevada Communications 87 Sub-Editor CAP CO Electronics Ltd 24 North Wales Radio Rally as Cambridge Kits 90 Practical Wireless 102 Applicants should, of course. have a sound 'Chip Shop' (Semicons) Ltd 92 Procomm (UK) 92 knowledge of radio engineering and a CR Supply Co 76 Radio Bygones 93 good command of written English. Datong Electronics Ltd 72 Radio Shack Ltd 70 They should either hold an Amateur Davtrend Limited 74 Randam Electronics 90 Radio Licence, or be prepared to Dee Comm Amateur Radio Raycom Comms Systems Ltd 89 R&D Electronics 76 obtain one. Products 92 Dewsbury Electronics 75 Revco Electronics Ltd 43 Familiarity with Apple Macintosh WP and Dressler Communications Ltd 74 RN Electronics 90 DTP systems would be a distinct G4TNY Amateur Radio 91 SEM 88 advantage. G4ZPY Paddle Keys 93 Siskin Electronics Ltd 90 Salary according to experience. Gares Electronics Ltd 70 South Midlands Comms Ltd GCHQ 102 32, 33, 34 & OBC Applications in writing marked "Private & Hately Antenna Technology .... 90 Stephens-James Ltd 72 Confidential" with details of your background and Heathertite Products 68 Technical Software 93 experience to: HRS Electronics plc 28,29 Total Communications 93 The Managing Director ICOM (UK) Ltd 66,67 & IBC TV Masters 92 ICS Electronics Ltd 73 Uppington Tele-Radio 92 MN Publishing lid.. Enefeo I louse, J & P Electronics Ltd 88 Waters & Stanton 69 The Quay, Poole, Dorset BNI5 I PP. RA Kent (Engineers) 13 Colin Wilson 93

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With 99 programmable memories the IC-R7000 by direct keyboard entry. A sophisiticated scanning system covers aircraft, Marine, FM Broadcast, Amateur Radio, provides instant access to the most used frequencies. By television and weather satellite bands. For simplified depressing the Auto-M switch, the IC-R7000 automatically operation and quick tuning the IC-R7000 features direct memorises frequencies that are in use whilst it is in the scan keyboard entry. Precise frequencies can be selected by mode, this allows you to recall frequencies that were in use. pushing the digit keys in sequence of the frequency or by The scanning speed is turning the main tuning knob. FM wide/FM narrow/AM adjustable and the scanning system includes the memory upper and lower SSB modes with six tuning speeds: 0.1, selected frequency ranges or priority channels. All 1.0, 5, 10, 12.5, 25KHz. functions including the memory channel readout are The IC-R7000 has 99 memories available to store clearly shown on a dual-colour fluorescent display. Other your favourite frequencies including the operating mode. features include dial-lock, noise blanker, attentuator, Memory channels can be called up by pressing the display dimmer and S-meter and optional RC-12 infra-red memory switch then rotating the memory channel knob, or remote controller, voice synthesizer and HP 1 headphones.

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Prices and specifications subject to change without notice.