For the very best in Com munications Receivers L k to Lowe

LOWE HF RECEIVERS DO IT AGAIN!

HF-225 voted "RECEIVER OF THE YEAR" in 1990 by W.R.T.H. HF-225 "FINLANDIA" voted "BEST DX RECEIVER 1992" at the EDXC Convention in Finland. Final choice was from IIF-225, NRD-535 and IC-R72E.

ONCE AGAIN THE REST IS BRITISH!

LOWE ELECTRONICS LIMITED Chesterfield Road, Matlock, Derbyshire DE4 5LE Telephone: (0629) 580800 Fax: (0629) 580020

BRANCH ADDRESSES: London (Middlesex): 223 Field End Road, Eastcote. Tel: 081-429 3256 London (Heathrow): 6 Cherwell Close, Langley. Tel: (0753) 545255 Newcastle: Newcastle International Airport. Tel: (0661) 860418 Cumbernauld: Cumbernauld Airport Foyer. Tel: (0236) 721 004 LO WE Bristol: 79/81 Gloucester Road, Patchway, Bristol, BS12 5JQ. Tel: (0272) 771770 LO WE Cambridge: 162 High Street, Chesterton. Tel: (0223) 311230 Bournemouth: 27 Gillam Road, Northbourne. Tel: (0202) 577760 Leeds: 34 New Briggate, Leeds. Tel: (0532) 452657 Kent: Chatham Road, Sandling, Maidstone, Kent, ME14 3AY. Tel: 0622 692773 Plymouth: The Basement, Royal Fleet Club, Devonport, I'lymouth, Devon PLI 4PQ. Tel: 0752 607284 Managing Editor Mike Dennison, G3XDV

Assistant Editor Marcia Brimson

Production Editor munication Sid Clark

Technical Editor Paul Lovell, G3YMP

Technical Illustrator N E W S A N D R E P O R T S Derek Cole

Editorial AasIstant John Davies. G3KZE 4 THE RADCOM LEADER There's never a dull moment for General Manager Peter Kirby_ Production Assistant Jennifer Preston 5 NEWS AND REPORTS - in colour

Editorial Secretary Guildford School Seen in Space e Visit Your Headquarters on 19 Erica Fry June • College Activity • GB2RS Plymouth • New RLO • Christian Amateurs' Conference e RSGB at NEPCON'93 • D-day COVER PICTURE: All contributions and correspondence Commemorated • Packet Frequency Proposals • Direct Debit concerning the content of Radio Arguably the most famous radio Double Jeopardy • Liberty and Fraternity • Jaybeam and TV Communication should be posted to' amateur in the World is HM King Masters • EMC Standard - An RSGB Proposal • GAM1 to be Hussein of Jordan. We were The Editor Installed e 1993 IARU Conference• RSGB President Visits ARRL Radio Communication privileged to find out first hand just • EMC Liaison Off icer • Prosecutions • Club Publicity in D-i-Y Lambda House, Cranborne Road what he thinks of the hobby. Potters Bar. Herts EN6 3JE Radios Code News • Scottish Trophies • Jersey Club's New HO Colour Feature page 50. Tel: 0707 659015 44 RSGB AGM 1992- Informal Session Photograph: Raymond Irons. Fax: (Editorial only) 0707 649503 E-mail (Telecom Gold) 87:COG083 46 MEMORANDUM AND ARTICLES OF ASSOCIATION - A review

50 THE HOBBY OF KINGS RodCom Advisory Panel RE G U L A R HM King Hussein of Jordan. JY1, talks to RadCorn. Colour. Peter Kirby A R TI C L E S General Manager 65 HF NFD - A Retrospective View Celebrating 60 years of this popular contest. A colour feature. Mike Dennison. G3XDV 12 HF NEWS Managing Editor 76 ISLANDS ON THE AIR AWARD John Forward, G3HTA 16 VHF/UHF NEWS Council Member

Neil Lasher. GBHIU 19 QSL Council Member T E C H NI C A L FE A T U R E S

Dick Biddulph, G8DPS 20 PROPAGATION Chairman, Technical and Publications 28 NOVICE NOTEBOOK Advisory Committee Ian Keyser, G3R00, introduces a novel idea for using your handheld in 21 IARU

Victor Brand, G3JNE1 the shack without risking it falling off the bench. A colour feature. Advertising Agent 24 SWL NEWS 31 A MULTIBAND DOUBLET for 10/18/24MHz. Justine Hodges V C Clear, G3TKN, has designed a neat wire antenna which provides gain 26 CONTEST EXCHANGE Marketing Coordinator on the 'WARC bands'.

34 EUROTEK - ideas from abroad ADVERTISING 29 NOVICE NEWS All display and classified Erwin David has abridged and translated a review of the BEKO 300W advertising enquiries (excepting 144MHz MOSFET amplifier first published in cq-DL. A colour feature. 35 PRODUCT NEWS Members' Ads) should be directed to our advertisement 36 IN PRACTICE agents 73 ORP Victor Brand Associates Ltd.. This month from Ian White, G3SEK: Stocking Your Junk Box • Ordering 'West Barn', Low Common. from Catalogues 5 Tuning and Loading • Drilling Holes. Bunwell. Norwich, 74 EMC Norfolk, NR16 1SY. 39 SIMPLY SILICON: National LMF -100 Tel: 095 378 8473 Fax: 095 378 8437 This chip is an audio filter, with Q. bandwidth and gain programmable with 79 BOOK OF THE MONTH resistors, and offering selectable low, high and band-pass outputs. 79 HELPLINES Radio Communication is published 41 A CALIBRATOR MARKER UNIT by the Radio Society of Great Britain Crystal calibrator circuits are not uncommon. This one, though, has the as lis official journal on the first day 81 CONTEST CLASSIFIED of the relevant month and Is sent tree unusual feature of adding a 'signature' to each set of markers. and post paid to all members of the Society. 52 TECHNICAL TOPICS 85 MEMBERS' ADS Beverage and his 'Wave Antenna' • Compatibility - But With How Much Closing date for contributions, unless otherwise notified, is live weeks prior to Power? • Australian Amateurs on Long Waves • A 14MHz 50/120W 88 CLUB NEWS publication date Valve Amplifier • Flammable Atmospheres, EMC Hazards and Mobile Radio • More on the Direct-Reading Capacitance Meters. 89 RALLIES AND EVENTS it, Radio Society of Great Britain 1993 58 A TWO -METRE SSB/CW TRANSCEIVER: Part three 89 SILENT KEYS Filmset by JJ Typographies Ltd, In this concluding part Bernie Pallett. G3VML, deals with the PA and LPF Unit 4. Baron Court. Chandlers modules, and alignment. PCB/Kit details are included. A colour feature. Way. Temple Farm Industrial 91 AT YOUR SERVICE Estate. Southend-on-Sea, Essex 62 DESIGN OF ACTIVE BUTTERWORTH FILTERS: Part one SS2 SSE In this first part, Dr G Brown, G1VCY. explains the difference between 93 THE LAST WORD Pnntod by Southernprini (Web Offset) theoretical and practical audio filters, and some of their applications. Ltd. Unit 17-19. Factory Road. Upton Industrial Estate, Poole. Dorset. 8H16 68 USER REVIEW: Two views of the SRW CobWebb 94 RSGB BOOK CASE 5SN This unusual multiband aerial was reviewed by Alan Carpenter, G3RQT. 98 INDEX TO FISCH membership Al the same time, we, at RadCom. had a chance to look at it so you have at 31 July 1992: 32,416 two reviews for the price of one! A colour feature. ADVERTISERS

RADIO COMMUNICATION June 1993 3 The RadCom Leader RADIO SOCIETY OF GREAT BRITAIN

THE NATIONAL SOCIETY WHICH REPRESENTS UK RADIO AMATEURS Founded in 1913 incorporated 1926. Limited by guarantee Member society of the International Amateur Radio Union

PATRON: HRH PRINCE PHILIP, DUKE OF EDINBURGH, KG

Membership is open to all those with an active interest in radio experimentation and communication as a hobby. Applications for membership should be made to the Membership Services Department from which full details of Society services may also be obtained.

Headquarters and registered office: Lambda House, Cranborne Road, Potters Bar, Hens EN6 3JE Telephone: 0707 659015 - Members Hotline and book orders Fax: 0707 645105. Telex 9312 130923 (RSGB) Electronic Mail Via Dialcom/Telecom Gold: 87 C00083 Never a Dull General Manager: Peter Kirby Company Secretary: John C Hall, OBE, G3KVA Moment COUNCIL OF THE SOCIETY PRESIDENT: P E Chadwick. G3RZP EXECUTIVE VICE-PRESIDENT: I D Suart, GM4AUP SOME TIME AGO a friend who I hadn't seen for some IMMEDIATE PAST-PRESIDENT: J T Barnes, GI3USS time asked me about my job as General Manager of HONORARY TREASURER: P D Tucker, G4DWZ the RSGB. I gave what I thought was a fairly good

ORDINARY MEMBERS OF COUNCIL explanation of what my duties were and what the E J Allaway. MB. ChB. MRCS, LRCP. G3FKM Society and amateur radio was all about. "Oh", he J Bazley. G3HCT said, "That sounds pretty dull". G L Benbow, Msc, CEng, MIEE, G3HB M HClaytonsmith, G4JKS A few days ago, sitting on a train on my way back to J D Forward, MBIM, G3HTA Potters Bar having attended a meeting at the Science J Greenwell, AMIEE, G3AEZ T I Lundegard. G3GJW Museum, I suddenly thought of this friend. Eur.-Ing. N Roberts, BSc, CEng, MBCS, G4IJF On this particular day, as I said, I was at the Science Museum discussing the future of the Permanent ZONAL MEMBERS OF COUNCIL Zone A: P R Sheppard, G4EJP Special Event Station GB2SM. The RadCom editorial Zone B: J Allen, G3DOT team were also in Central London interviewing HM Zone C: N Lasher. G6HIU King Hussein of Jordan, JY1. The HQ Rally team were Zone D: J G Gannaway, G3YGF Zone E: C Trotman, GW4YKL en route to the Isle of Wight for International Marconi Zone F: I J Kyle, GI8AYZ Day. And the President of the Society, Peter Chadwick, Zone G: I D Suart, GM4AtJP G3RZP, taking advantage of a visit to the USA on ANNUAL SUBSCRIPTION RATES business, was visiting the AR RL. Corporate Members: UK and Overseas (Radio Communication sent by Life working in amateur radio is dull? Never! surface post): £30.00. Airmail rates on request. UK associate member under 18: £15.00. Family member: £12.00 Saturday 1 9 June is a day we are all looking forward Corporate (Concesslonary): £25.00 over 65 or full lime student under to at HQ - Open Day. It's our chance to show you life 25. (Applications should provide proof of age at last renewal date and/or include evidence of student status.) at Lambda House. Since last year's Open Day a lot of Affiliated club or soclety/registered group (UK): £15.00 (including work has been carried out to Lambda House; we now Radio Commmunication). (Subscriptions include VAT where applicable.) have an HQ we can all be proud of. Special arrangements exist for blind and disabled persons. Details are As last year you will be able to tour the building, available from RSGB HO. meet the staff and visit the museum and the library.

Membership application forms are available from RSGB HO There will also be local clubs in attendance and refreshments will be available. I do hope you will join RSGB Main Switchboard: US. Peter Kirby, 0707-659015 General Manager

4 RADIO COM MUNICATION June 1993 UK Grammar School boys are beamed up to the shuttle NE WS

• GBODC AIMS TO TELL the Guildford School world of the 900th anniversary of the laying of the foundation stone for Durham Cathedral. Look for them on 3.5, 7, 14,21 and 28MHz SSB and 430MHz SSB and FM, Seen in Space on 22, 23. 26 May and 2, 5. 6, 9, 16, 19, 20 and 23 June. Details G4JDP, 091 388 5936. UPILS AT the Royal Grammar School, • APOLOGIES TO Bob Peace, G8SOZ, who was wrongly de- Guildford have be- scribed as retiring Planning Com- come the first outside mittee Chairman. Bob Beace has America, perhaps retired as EMC Committee Chair- theF first in the world to have a man. The Chairman of the Plan- direct colour TV link to the ning Advisory Committee was space shuttle DiscoverySTS- Harold Fenton, G8GG. 56. In addition to the video • FORMER COUNCIL Member, link, there was two-way voice Angus McKenzie, G3OSS, was contact between the shuttle recently married at Finchley Meth- and pupils during two orbits odist Church. He met his bride, on 9 April. Angela, whilst out exercising Simon, his guide dog. The school's reputation for • AR RL PAST PRESIDENT 'space firsts' managed to se- Harry J Dannals, W2HD, has cure it an official role in the been named the Dayton radio experiments (SAREX) Hamvention Ham of the Year for being conducted aboard Dis- his three decades of voluntary covery. In the past, the Royal This tiny part of Guildford was visible from space on 9 April, thanks to Frank work. Grammar School has been Bell, G7CND, and his pupils: (I to r) Back row - lain McIntosh, 2E1BNG; Daniel Saunders, 2E1BNL; Theodore Markettos and Leslie Starkey, G70EK. Front row • THE CHINESE Taipai Ama- the first school to talk to Helen - David Lloyd, 2E1BMN; Ben Nichols; Robert Penman and Andrew Timewell, teur Radio League has become Sharman on the Mir space the 126th member society of the station, as well as having dig- direct contact with NASA's radio contact. Antenna direc- IAR U. ital and voice contact with the mission control in Houston. tion and Doppler correction shuttle Atlantis. Because of the shuttle's atti- was carefully controlled from College Activity Space pictures are received tude manoeuvring during the the school's radio station. daily in the school's radio first link-up, only a brief voice SOUTH-EAST ESSEX Sixth When the SSTV image room. Frank Bell, G7CND, exchange was possible. The Form College holds its annual (shown above) was sent, Activities Week 7 - 11 June. 85 who is Deputy Head of Sci- mission director in Houston KB5AWP on the Discovery lower-sixth-year students will ex- ence at the Royal Grammar, made the decision to allow a reported receiving a good perience amateur radio for the described the school's activi- further contact on the next clear picture. Then three pu- first time with GB5SAW, super- ties to an enthralled audience orbit 90 minutes later. The pils asked questions directly vised by G1VCY and sponsored at last year's AMSAT-UK second contact proved to be to the astronauts. These re- by Waters and Stanton. Opera- Colloquium. a triumph. The equipment lated to their onboard atmos- tion will be on 2m and 70cm SSB, During the radio link with worked well and there was an FM and packet and any calls or Discovery, the school was in interference-free six-minute continued on page 6 messages will be enthusiastically received. Packet messages should go to GB5SA W GB7DUG. Visit Your Headquarters on 19 June SATURDAY 19 JUNE is our GB2RS annual HQ Open Day. Additional attractions this year Plymouth are refreshments, local clubs WE ARE SAD to report that Lieu- and a balloon race! Bring your tenant Commander Ellis Diggle, friends and family. G3LSD of Stoke Damerel, Ply- + Meet the staff mouth died on 1 March. Until his + See the QSL Bureau recent illness, Ellis was a GB2RS news reader on 80 metres. The + Use the shack news is now read from Plymouth + Tour the Museum - recently by GOLRJ. expanded + See how RadCom is New RLO produced + Browse round the Bookshop THE RSGB Liaison Officer for Tyne and Wear and Co Durham Open 10.30 am to 4.30 pm is J I Batley, G0110, 3 Folldon Avenue, Fulwell, Sunderland HO W TO Tyne and Wear SR6 9HP; tel 091 RSGB HO is on the right hand side of Cranbome Road, (look for the aerials!) 548 3301. The map is not to scale. GET THERE

RADIO COMMUNICATION June 1993 5 NEWS School in Space

continued from page 5 K051 and Marcel. G1NBR, both of whom work at the Centre for pheric experiments and the po- Satellite Engineering Research tential damage caused to the shut- at the University of Surrey. tle by space debris. The shuttle crew included Ken Cameron, KB5A WP; Ken At Six AM Cockerell, GB5UAH: Mike Foal, KB5UAC: Ellen Ochoa, KB5TZZ EVEN THOUGH THE scheduled and Steve Oswald. KB5YSR. contact was at half-past six in the morning during the Easter holi- days, many pupils crowded into Pupil Power the school's radio room for a G7CND ORGANISED the chance to talk to the astronauts. school's radio equipment in The 1992 D-Day event on Soulhsea Common. Horndean ARC would be pleased One pupil who returned to Guild- preparation for the contact, but it to see you at GB6OL thls year. ford from Gloucester specially for was the pupils themselves who the chance to be involved with controlled almost all of the voice the event said it was certainly and TV exchange. Ben Reed, D-Day Commemorated worthwhile. 2E1BLR, was the main operator GB6OL (OVERLORD) WILL be shal forces prior to the D-Day Equipment used at Guildford of GB6STS. Many other pupils on air from Southsea Common. landings. All HF bands will be was a FT726R plus 100W linear, have theirown callsigns and more near Portsmouth Dockyard 29 to used, plus VHF and packet from feeding a 20-el crossed yagi. Two are taking their exams as this is 31 May. 0800 to 1700GMT. Visitors are Kenpro rotators were used for being written. A wonderful result Members of the Homdean ARS most welcome at the event which az-el adjustment. of Frank's enthusiastic use of intend operating from signals ve- also features all types of vehi- Frank gratefully acknowledges amateur radio as an educational hicles loaned by the Military Vehi- cles, tanks, field guns etc. The D- the help given by Doug, GOSYX/ tool. cle Trust on a site used to mar- Day Museum is close by.

Christian Amateurs' Conference Packet Frequency Proposals CHRISTIAN RADIO AMATEURS and amateur radio activities is THE VHF COMMITTEE is con- ties and would welcome com- are invited to attend the Annual planned. sidering various proposals for al- ments from any interested par- Conference of the World Asso- The inclusive charge of £50 locating more spectrum for packet ties: ciation of Christian Radio Ama- and bookings, or requests for fur- radio on 144MHz. As well as some 1) Create a digital communica- teurs and Listeners to be held this ther information, should be ad- proposals of our own we will also tions sub-band of 144.5375 - year at the St Edwards Baptist dressed to W G Peterson, be considering the following pro- 144.6875MHz Conference Centre at Malvern. G4EZU, 124 Darnley Rd, Graves- posals submitted by various Eu- 2) Create a digital communica- Held 8 - 10 October, a full pro- end, Kent DA11 OSN: tel 0474 ropean societies for discussion tions sub-band of 144.5875 - gramme of fellowship, worship 533686. at the IARU Region 1 meeting in 144.7375MHz. This would re- Belgium in September. quire the definition of a new frequency for FAX calling. The IARU proposals are summa- 3) Allocate two existing 'chan- RSGB at NEPCON'93 rised first. The initials are the THANKS TO GENEROUS spon- visitors passed through the NEC's originating society and the C5 nels' such as S8/S9 to packet sorship by Reed Exhibitions and Halls 1 and 2. Over a thousand, number refers to a particular pa- radio. Proposals 1 and 2 create a Graseby Technology, the RSGB many from overseas, called in at per. sub-band of 150kHz which could was able to put on a stand at the RSGB stand. Of the 315 who DARC (C5.10): Allocate 144.610 NEPCON'93, one of the largest signed the visitors' book. 158 accommodate six 25kHz chan- - 144.630MHz for narrow-band electronics exhibitions in the UK. carried callsigns, including JA, F, nels or eleven 12.5kHz channels 'automatic digipeaters', band- Steven Farrer, the Exhibition Di- VK, LA, ZS, 2E, 2W and OH. - think carefully about bandwidths width not to exceed 5kHz. rector of Reed and David Stand Organiser Hilary versus channel centre frequen- Topham, GM3WKB, of Graseby, Claytonsmith, G4JKS, was ably UR E (C5.24): Allocate cies to see why it's not 12. Nar- provided the Society with a 15' x assisted by John Layton, G4AAL; 145.300MHz or 145.275MHz for row band RTTY needs to be ac- 15' comer aisle stand which at- John Harvey, G4IVY: Peter normal packet radio. commodated within the sub-band. Comments on all the above tracted an enormous amount of Merall, G4TMK and Ray Yates. REF (C5.42): Allocate 144.600 - proposals should be sent to the interest and many enquiries. G8ACR, with Warwick Hall. 144.610MHz for narrow-band During the three days of the G4WMH, providing logistical packet radio. RSGB VHF Committee c/o exhibition, overthirteen thousand support. G3UBX (QTHR) or via packet REF (C5.43): Allocate radio to G3UBX @ GB7MAX or 145.275MHz for normal packet via Internet Email to radio. [email protected] The VHF Committee is also con- Peter Burden, G3UBX, Chair- sidering the following possibili- man RSGB VHF Committee

Direct Debit Double Jeopardy SUBSCRIPTION SERVICES LTD has said it regrets that, at present, it can collect only one Direct Debit from a bank account for amateur licence renewal fees. This has caused difficulty where two licensees sharing a joint bank account have different renewal dates. The situation is likely to be resolved shortly but in the meantime anyone who is in this position is advised to make alternative payment Before the doors opened: the RSGB stand at NEPCON'93. arrangements.

6 RADIO COMMUNICATION June 1993 NEWS

Liberty and Fraternity The RSGB — Working for You AS A MEMBER of the Free the UK using only its 18m long- French Forces, Jean Cendral wire antenna strung from a tree. operated under the name Paul He intends using the 80m or Chaubet. Code-named 40m bands in Vercours on 26-27 EMC Standard 'Lombard', he was dropped into June and in Temple on 15 Au- An RSGB proposal France in an area known as Tem- gust, and is looking for French- ple with the mission of establish- speaking UK licensees to com- AS REPORTED in News and Re- communication equipment. ing a radio liaison network with plete the contact. Volunteers are ports, April, the Society has This is framed around com- the UK. Now licensed as F6IGL, invited to call Jean (reverse the formed an 'ad hoc' group with the mercial communication re- Jean plans to mark the 49th anni- charges, he says!) on 010 33 68 intention of producing an EMC quirements. and does not re- versaryof the liberation of France 25 39 79, or write to him at 25 Standard forcommercially manu- flect the special nature of by using one of the original Mk3 Avenue St Louis, 11620 factured amateur equipment. The amateur radio, where know- 'suit-case' transmitters to work Villemoustaussou. France. first meeting was held at HQ on ing how to operate the equip- Tuesday 6 April, and after many ment, and how to deal with hours work a first draft of the problems which may arise, is standard was roughed out. There part of the skill expected of is still a great deal of work to be holders of the Amateur Radio done, in consultation with manu- Licence. facturers and with other Region I (2) II amateurs themselves do IARU Societies, before a final not put forward a suitable version can be formally put for- standard, some other admin- ward to the European Telecom- istration or organisation may munications Standards Institute produce one reflecting their (ETSI). own interests. This may well It is important that members be against the interests of should be in no doubt as to why amateurs - even to the extent the Society has undertaken this of being more demanding than somewhat thankless task. There the generic standard. are two reasons: Members wishing to contrib- (1) If no standard is raised for ute should write to Peter amateur equipment, then it will Chadwick, G3RZP. c/o RSGB automatically come under the HQ, marking the envelope 'EMC *generic' standard for radio SPEC'.

GAM1 to be 1993 IARU Installed Conference THE RSGB'S PROPAGATION THE NEXT REGION 1 triennial Data Beacon, GAM1, is soon to conference is to be held 19 - 24 be operational on 3.821MHz. The September in De Haan, Belgium. final bits of official paperwork are The Society will be sending a being processed and crystals are number of delegates to represent awaited. Full details of this latest the interests of all UK amateurs in RSGB service will be published this international forum. See our as soon as the station has been new bi-monthly IARU column on commissioned. page 21 for some background.

RSGB President EMC Liaison Visits ARRL O fficer PRESIDENT PETER Chadwick, THE RSGB COUNCIL has ap- G3RZP, taking advantage of a pointed an EMC Liaison Officer visit to the USA on business, re- to provide a direct link between cently visited the Headquarters the RSGB and the RA's Radio RSGB HO STAFF were on hand at the Wireless Museum, Puckpool, Isle of of ARRL at Newington. Connecti- Investigation Service. He is Fred Wight, to assist in the celebration of International Marconi Day on 24 April. Selling RSGB books were Despatch Manager Derek Lund and Amateur Radio cut. During his visit he discussed Robins, G3GVM, who is a mem- Administrator Lynnette Crawshaw. The room was formerly an ammunition the relationship between the ber of the Society's EMC Com- tunnel! Meeting the Lord Lieutenant of the isle of Wight. Lord Mottistone, were AR RL and the US licensing au- mittee and is professionally in- representatives of two services: (I to r) Wing Cdr Alec Gilding, G3KHS (RAFARS); thority, the FCC. Other topics in- volved with EMC. The appoint- Museum Executive Officer Vern Scambell, G3FWE (RNARS); and CRS Mike cluded bandplanning, European ment has been made as part of Matthews, G3JFF (RNARS). GBOIMD was on air throughout the day. EMC specifications and the cur- the Society's greatly increased rent position of incentive licens- profile in the area of electromag- Jaybeam and TV Masters ing in the USA. netic compatibility. FOR SOME TIME, the sole distributor of Jaybeam antenna spare parts has been TV Masters. However, as the manufacture of this • 93 COMPETITORS entered • AWARDS FOR the 50th anni- range is now carried out by SMC (Southampton), TV Masters will be the 1992 All-Japan ARDF Cham- versary USAAF into Essex unable to continue to support this line. pionship, including some from (GB5AF, GB4EC, GB2GB, In general, orders for Jaybeam spares should now go to SMC but China, Korea and Russia. GB2AFE and GBOWB) are now a few items are still available from TV Masters while stocks last, so it • The 1993 European ARDF available. Applications go to may be worth giving them a call (0604 37769). TV Masters have asked Championships will take place in Braintree and District ARS, us to convey their gratitude to RSGB members for their custom over Czechoslovakia, 7 — 12 G4JXG, 88 Coldmailhurst Av- the last four years. September. enue, Braintree, Essex CM75PY.

RADIO COMMUNICATION June 1993 7 N E WSPORTS Prosecutions Scottish ON 29 APRIL, David John Giles- Probert, formerly G7GDR. ap- Trophies peared before Dudley Magistrates TWO TROPHIES are awarded charged with three offences un- annually in Scotland: The Jack der the Wireless Telegraphy Act. Wylie Trophy to the Scottish club, These were in connection with society or RSGB member thought alleged offences committed on to have done most for amateur 20 and 22 October 1992 which radio in Scotland, in general involved the transmission of mu- terms, in the past year. And the sic, general broadcasts without Jock Kyle trophy to the Scottish the use of a call-sign, and the use club, society, group or RSGB of abusive and offensive language member thought to have done through the GB3BM Repeater in most in Scotland in the field of Birmingham. VHF in the past year. In the case The magistrates sat from 10am of an award being made to an until 5pm, and since at the end of RSGB member that person must the day the evidence for the pros- have been resident in Scotland ecution had still not been com- during the period that the award pleted, they adjourned the hear- refers to. ing, and set aside 8 and 9 July for In 1992 no nominations were the resumption of the case. received for eithertrophyand they Giles-Probert's VHF trans- Taizo Arakawa, GWORTA I JA3AER, with Brownies he tested for their Radio were therefore not awarded. ceiver, frequency counter, scan- Communication badge. Taizo also provided an HF station for Thinking Day on Nominations and citations for ning receiver and SWR meter, the Air. each of the trophies in respect of which had been seized during a the 1993 awards are required from search of his premises, were re- at least five RSGB members resi- tained by the court for the time COPE NEWS dent in Scotland who should send being and he was released on them to the Zonal Council Mem- unconditional bail pending the ber, Ian Sued, GM4AUP, by 13 resumed hearing. August 1993. In the event of more ARRL Backs Backs Morse than one nomination being re- Fined £100 US NATIONAL Society the American Radio Relay League has ceived for either trophy the final At Lisbum Magistrates Court on resolved to continue support for Morse code proficiency for amateurs decision on the award will be 25 March, a radio amateur was operating below 30MHz, as presently required by international law. placed in the hands of the Scot- convicted under Section 1(1) of Citing the code's longevity as a licence requirement and its ability tish RLOs. In the event of no the Wireless Telegraphy Act 1949 to overcome language barriers, the ARRL Board instructed "all ARRL nominations being received, the for use of radio other than in representatives to continue to insist before all national and interna- trophies will pass to the safe keep- accordance with a licence and for tional bodies that there be no modification to the present . . . ing of the Zone G Council Mem- having apparatus available for use requirement". ber until nominations are called other than in accordance with a The RSGB's HF Committee recently sought the views of all UK for in 1994. licence. amateurs on this matter (RadCom, December 92). Their report is The defendant was fined £100 currently under preparation and will be published in RadCom just as plus £10 costs. More painfully, soon as it is available. Jersey Club's perhaps, his £500 Yaesu HF New HQ transceiver, which was used for the offence was ordered forfeit. Morse Record New Test is ON SUNDAY 25 APRIL, General The case arose following Broken? Faster Manager Peter Kirby was a guest complaints of interference to at the opening of the Jersey Ama- A CLAIM THAT THE Morse re- RESULTS FOR the first month of television reception in Lisburn. A teur Radio Society's new head- ceiving speed record was broken the new 'OSO format' RSGB search warrant was obtained and quarters at Point La Moye, St in 1991 is being investigated by Morse test, introduced by the served last October, when the Brelade. The new HQ is located The Guinness Book of Records. Radiocommunications Agency on defendant was found to be in a former Signals Station built The existing record of 75.2WPM 1 April, show a 70% pass rate transmitting on an illegal by the Germans during their war- was established by Ted R which is slightly higher than un- frequency. Amazingly, the time occupation of the islands. McElroy in a tournament held in der the old formal defendant had previously been The official opening was carried North Carolina in 1939. Any mem- given warnings about his illegal The time taken for the test it- out by the Lieutenant Governor ber able to confirm the 1991 transmissions. self has been more than halved, of the Channel Islands, Air Mar- record claim, or who wishes to from nine minutes to four minutes shal Sir John Sutton, accompa- stage an attempt on the old one, per candidate. nied by Lady Sutton. The impres- Club Publicity should drop a line to the RadCom sive building has been refurbished office at RSGB HQ. by members of JARS with the in D-i-Y Radio M e-s- help of various local organisa- IF YOUR CLUB is holding an tions including Lions International. event which is particularly suited Jigee- • SOUTH AFRICA has scrapped a long standing rule that ama- to the beginner or Novice licen- • THE US COAST GUARD in- teurs must complete 200 CW see, the RSGB can provide pub- tends to discontinue CW licity in D-i-Y Radio. Details of watchkeeping on the 500kHz dis- contacts, or a year of CW, before being allowed to use phone. relevant meetings, rallies or open tress frequency from 1 August days should be sent to Marcia and to cease all Morse code serv- The Republic of Ireland Brimson at RSGB HQ, marked ices in the medium frequency scrapped a similar rule last year. D-i-Y Radio'. And don't forget to band. From that date, ships must Many members will remember tell us about any committee mem- be equipped for satellites and HF this kind of restriction in the UK, bers with special responsibility SSB. too, some years ago. for newcomers and Novices.

9 RADIO COMMUNICATION June 1993 tri It

RA HAMS RES THE BEST BRA NtemS AN D THE BEST SERVICE AT THE BEST PRICES ARE AITIN G FOR YOU NO W

ALINCE1 itO R

) cushçrcrft D a VIS Cill E n e e elf" KENW'OOD MICPESET® 0 L____MO eh'or i C 0 M Y A E SU YUPITERU Did you kno w that the best deals are always Visa, Switch and RSGB card are welco me and available at RADIO HA MST ORES. Part-exchange, finance can be arranged (subject to status). trade-ins and second-hand purchases are always Interest-free credit is also available on selected welco me. W e help radio enthusiasts to own the new ICO M products. equip ment they really want, all top brands are If you cannot visit a RA DI O H A MST ORE in available at prices to suit your pocket. person, why not take advantage of our efficient Did you also kno w that RADIO HA MST ORES are M AIL O R DER SER VICE. Stock items normally authorised service engineers for Yaesu, Ken wood dispatched within 24Hrs. and ICO M equip ment. All servicing being carried W e give full w arranty on all ICO M products out at our Herne Boy branch. bought fro m authorised ICO M UK dealers. In W e stock AE A, AK D, Alinco, A OR, Barenco, some cases the equip ment will be replaced if the Co met, Cushcraft, Davis, Dee Co m m, Dia mond, fault is beyond speedy and satisfactory repair. Ico m, JRC, Kenvvood, Lowe, Microset, MFJ, RSGB ICO M equip ment purchased from an unauthorised Books, Toyo, '(ceso, dealer is not covered by ICO M warranty. G ordon G3LE 0 & John G 8 V10 at Birmingha m, [4-6 1 Yupiteru, new, second- ICOM hand & ex-de mo gear. Chris G8 GKC at Herne Bay and Doug G OLU H & Pay ment by Access, Paul G7 M NI in London look forward to your visit.

SWAIECtlf FE

GREENHril HERNE BAY HAMSTORE

L IV CS 0 IV H E R NIE B A Y Into- rnation al H ouse, 11 W atford \Nay, Unit 8, Hern e Bay W est Hen d on. Industrial Estate, Se a Stre et. 963 W olverh a m pton Rd. Old bury, Lon d on N W4 3JI H erne Bay, Kent CT6 81_D. W est Midlan ds 869 4RJ Tel: 081 202 0073 Tel: 0227 741555 Tel: 021 552 0073 Fax: 081 202 8873 Fax: 0227 741742 Fax: 021 552 0051 LO N D O N ST ORE O PE N: M O N TO FRI 09:00-1 7:00 & 09:00-1 6:00 SATS. HER NE BAY & BIR MIN G H A M O PE N: TUES TO FRI 09:00-1 7:00 & 09:00-1 6:00 SATS. N.B. H ern e Boy close d for lunc h 1300- 1400. LOWE ELECTRONICS LO WE The Professionals in Amateur Radio

YOU'VE READ THE KEN WOOD We had quite a laugh the other day, BOOK... looking at one of our competitor's STILL NUMBER ONE FOR HF latest attempts at selling the benefits ... NO W SEE THE FILM! TS950SDX £3699.95 of his "service department". There's Now at all Lowe Electronics TS850SAT £1799.95 only one sure way to check out a branches, Peter Thornhill's excellent TS850S £1649.95 service department and that is to RAE Course is now available on TS450SAT £1499.95 go and see it. We're more than video! Peter runs a number of RAE TS450S PHONE! happy to take customers around and Novice courses in the Plymouth TS690S £1449.95 our service department — to see area and has many years of expe- TS5OS £999.95 the level of technology needed to rience in getting people that all keep your gear working — to see STILL NUMBER ONE FOR important licence — and he's got a the thousands of spares we stock, VHF/UHF terrific pass record to prove it! on the shelf — to see the level of Now everyone can get the benefit l'S790E £1799.95 skill demonstrated by our seven, of Peter's experience, from the TR751E £749.95 full-time expert technicians. (To be comfort of their own armchair, and FM241E £369.95 fair, haven't counted our R&D in their own time. At only £19.95, TM441E £399.95 staff!) Whilst I'm on the subject of it's an ideal present for a raw TM531E £449.95 people, make sure that whoever is beginner, or even for those who 11/1702E £539.95 going to repair your hard earned rig claim to know everything! Check UM732E £669.95 has professional qualifications and out the new companion video 114742E £829.95 really is a full time employee of the Maths for the RAE. In all Lowe company, otherwise his motivations TH78E £469.95 branches now at just £19.95. for doing a proper job may be TI-128E £289.95 different, and to ensure that your 11-148E £329.95 NEW!! NE W!! NE W!! legal rights are not compromised. 11-126E £249.95 Banish static for ever with the new After all, you can hardly expect AS1 Static Discharger. This is a OWE — STILL NUMBER ONE someone whose daytime job is wick discharger, similar to that FOR KEN WOOD mending false teeth to be fully used on aircraft for static protection. Don't forget we are still the UK's conversant with the workings of a Protect your front end now for biggest Ken wood dealer AND we TS950SDX — the circuit's over 33 only £17.95. give you a TWO YEAR feet long! Proper after sales service If you want to know the cause and WARRANTY on all Kenwood does cost money and it is impossible effect of static discharge and corona transceivers. to provide with continual price noise, ask for the ASI datasheet. cutting.

COMING SOON, BUT ONLY FRO M LOWE ELECTR ONICS — THE TS450SDX'"

Colin G3XAS at Dave G4KFN at BOURNEMOUTH NEWCASTLE 27 Gillam Road, Newcastle Airport, Northbourne, Woolsington, Bournemouth Newcastle upon Tyne BH10 6BW NE20 9DF Tel: 0202 577760 Tel: 0661 860418

Fred G4RJS at Tony G4NBS at Sim GM3SAN at LONDON CAMBRIDGE CUMBERNAULD 223/225 Field End 162 High Street, Cumbernauld Airport Road, Chesterton. Cumbernauld. Eastcote, Cambridge Scotland Middlesex HA5 1QZ CB4 1NL G68 OHH Tel: 081 429 3256 Tel: 0223 311230 Tel: 0236 721004

RADIO COMMUNICATION June 1993 Steve G6URJ at Tom G4LAR at Head Office Main Showroom KENT LEEDS and Mail Order Chatham Road, New Briggate, Sandling, Leds Maidstone, LS1 6NU DERBYSHIRE Kent ME14 3AY Tel: 0532 452657 Tel: 0622 692773 Here to help you are: Rob G8MPT, Bill G8LXN Beryl GiLME, Julie Tom G6PZZ, Richard G3OCIT Steve G1WSY at Derek Foster G7ESZ Peter Thornhill G6ZKO John G3PCY HEATHRO W PLYMOUTH Chesterfield Road, Matlock, 6 Cherwell Close, The Basement, Derbyshire DE4 5LE Langley, Royal Fleet Club, Tel: 0629 580800 Slough, Berks Devonport, Plymouth, Fax: 0629 580020 SL3 8X8 Devon PL1 4PQ Tel: 0752 607284 Tel: 0753 545255 Fax: 0752 607285 NE W

"CAPTAIN! THE WARP DRIVE IS UP FULL, I CANNA GIVE YE ANY MORE POWER - AND WE STILL CANNA HEAR THE SUBSPACE SIGNAL!! WHAT ARE WE GOING TO DO?"

"KIRK TO ENGINEERING - THERE'S ONLY ONE THING WE CAN DO.. BEA M ME UP SCOTTY!

Butternut's super HF5B is back in We might think the French have Of course with any beam you stock offering superb value for some funny ideas about agriculture really need to be able to turn it money. You get a full five bands in and fishing but there are three around and there's nothing better a very compact design, making it things they do get right — food, than with our world famous Emo- ideal for those with restricted space. wine and antennas! tator rotators. Starting at only £199.00 At only £309.00 it even suits those Emotator have something for every- with a restricted wallet! one, solid engineering, long life and great reliability. We've an excellent Emotator catalogue, full of very useful information and tells you how to apply the technical data This season we've added the Tonna associated with wind loading of range of vhf and uhf beams. Tonna have been around for years and antennas and rotator power then represent incredible value. The qual- you'll be able to answer to the ity of construction is very good and question of whether to buy the Don't forget Butternut's super range they are mechanically sound despite rotator to suit the antenna or the of HF multiband verticals — more the light weight. Also you can get antenna to suit the rotator! A word bands for less pounds than many on the air straight away without of advice from someone who's competitors. Ask for our Butternut fiddling about with gamma matches been there, — the purpose of a rotator brochure today and see what you're and the like — with a Tonna, you is not to turn the beam but to keep it missing out on! just plug in and go! pointing in the direction you want.

Of course once you've got that meaty new rotator and some shiny new beams, you might need some other bits of hardware to go with it. You don't need to trek round galaxy for all of this — each of our many branches al of 'em now!) carries a full range of Barenco antenna hardware — antenna clamps, mast couplers, T and K brackets, chimney lashing kits and many other items. We also carry genuine British made coax — you know, the stuff with proper braid, rotator control cable and nearly all the connectors you are ever likely to need. Boldly go to one of our branches today and talk about a package deal on a new beam and rotator — it may not cost as much as you think! We're one Enterprise that really cares about our customers. (PS — A quick safety first message: When installing antennas, don't forget to Kling-on tight!)

RADIO COMMUNICATION June 1993 11 not worked. The pirate calls him- self 'Mike'. BAND REPORTS QUITE A LOT of input this month In spite 01 the alleged falling olf of conditions on the bands. Thanks go to G2AFV, G2HKU, G3's GVV, OF, IZO. KKJ. YAM, G4's PROPAGATION DON. DJC, GW4KGR, G4's MU W, NXG/M, XRV, GOKDS, RS 30144. and the UK DX Packet Cluster via G4PDO. Stations listed In italics were using Cw• THIS MONTH SMITHY confirms 18M Hz the suspicions of many that con- 0000 EA9MK, 9K2MU. JOHN ALLA WAY G3FKNI ditions have deteriorated on all 0600 CUOWPX, NF6S/KPI, TK5BF, YVIORK. 2100 4X4DK, 9G1AA. 10 Knighilow Road, EIrmingham bands including 1.8MHz where 1317 808 2300 PYOFM, ZS4TX, 7X2DG. G4DBN complains that "160 10M Hz propagation has been appalling 0000 P4OAA, VP5P. since February, and pretty poor 0500 KH6AFS, ZB2/01..7VEE. all of this year". 0600 VR6BB. 'M VERY PLEASED to be The G8KG report goes as fol- 0700 FK/DJ5CO, J52AG, VK3XX, VK9NS, ZB2AZ, 5T5CJ able to report that after very lows: "Broadly speaking, solar 1800 C2INK2BEX. DPOGVN, TR8RR, ZA1M, 91C77. long negotiations the Ca- 2000 activity continued to be on a pla- 2100 FK8CP, TA2BK, 3B8CF, 5R8DJ, nadian Radio Relay League teau up to the end of March but 2300 C6A/DL7VOG, FM5BH, HP2C WB. TU4SR. V420KAO. 807VM, 9G IAA. and the Canadian Amateur there were signs of a slow decline 14MHz Radioi Federation have finally in the first three weeks of April. By 0600 ET3YU, FK8FU, KH6s, T30JH merged to form the Radio Ama- the end of this period the 27-day 0700 FW1FM, H44BC, HC8A, KH3AF, V630M, VK9ND, YJ8RN, ZK I TB. teurs of Canada. Congratulations average solar flux had fallen 0800 A35KB, H44MS, P29A1, V63CS, 5W1C W. 1000 C2INK2BEX, KH6FKG, FW1DJ, V73C, to RAC - and every success in the steadily from values in the 140s 1500 BVs 2TA, 4CT, OX3KM, VQ9s MW, TV, W6-W7, YBOARN. future. to only 117 sfu, just above the 1600 JT1BG, %/MSS, Vil HAS, 9M8YL. The comments made by Rag. low' recorded in June of last year. 1700 V85PB, XU3UN. OZ8RO, about the recent AH1A At the same time the slight up- 1800 EP2MHB, XU3RLD. expedition really started some- ward trend in geomagnetic activ- 2000 A71BY, ET3S1D, HS1HSJ, STO/PA3CXC, El4HF/T5, XU7VK. thing! In a recent reply Rag says ity reported last month seems to 2100 C9/J, JA9AA, TZ6FK. 2200 A71A, VP8CMX, ZXOF. that his remarks were really meant have continued and there is an 18MHz to address generalities which increasing tendency for major dis- 0900 A35KB, A92BE, VK9NS, ZL4DJ, 9K2ZZ. apply to anyexpedition. He says, turbances to occur at 27-day in- 1100 J52AG, PJ2MI, V73C, "However, if one is prepared to tervals which is characteristic of 1200 H44MS, 3020B. put up with all the hassle and the declining phase of a cycle. 1500 S21ZK, TA2BK, YB4GDZ. inconvenience connected with In their March bulletin SIDC 1600 SV9/W9GHY, TU4SR, VQ9AC, XU5SE. DXpeditions to remote places, Brussels offer a first tentative fore- 1700 C5308, HH3RA, KP2A, KH6CC, V8510( 707XX, 9G1AA 2000 DPOGVN, FS/DF4VX, W51,11.1/KP1, 6W6JX. one hopefully also has the 'guts' cast of the timing of the forthcom- 21MHz to accept comments and sugges- ing minimum as arriving probably 0800 WOW WB/KHO, KL7CUS, ZXOF. tions which could improve the between November 1995 and 0900 BT5HPW, ET3YU, T2OAA. YK1A0. productivity, efficiency, and qual- September 1996 which would 1100 P29DX, T3ONJ. ity of future ventures. When so mean an unusually short cycle 1200 KG6DX, YI1AL, ZS9A. 9G1AA many put so much time, effort, lasting between nine and ten 1300 ET3DX, V63s CS, OM, 5R8DJ 1500 C91S, ET3U, W5IJU/KP1, VU7CG, YI1MH. and money, into going places to years. This is perhaps a good 1600 A61AF, BV6ER, VQ9BB, XU4OF, 7Q7JL. 9V1X0 operate, and so many spend so time to remember that while it is 1700 A25/0N5GA, SU1ER, VQ9MW, 9G1AA, 9X5HG. much time and energy trying to quite usual to see references to 1800 A22RV, HC8J, ZXOF, 5R8DG, 5X1A. work them, it must be relevant to the '11 year cycle' the past 14 1900 HC8A, J52AK. VP8CKB. ZD9BV, 4V2PK make assessments when a cycles fall into two distinct groups, 24MHz DXpedition is over. seven 'long' cycles (9 to 14, and 1100 A35KB, YI9C W, 9F2C W. "That does not mean that I 20) with a mean duration of 11.7 1200 FK/DJ5CQ, S21ZG. 1400 A45ZZ, FR5HL, FY5GB, JY5GA, ZB2/DL7VEE, 308CF believe I have all the answers to years and seven 'short' ones (8, 1900 W51JU/KP1, XOOYAF. why some seemed to be more 15 to 19, and 21) with a mean 28MHz successful than others. But, I duration of 10.2 years, the short- 1100 BV2CD, KX6BM, GW3ZEY/SU, VB5PB. believe that constructivecriticism est of these lasting 9.6 years. 1200 ET3DX, FR5GG. 5H3JC, 5R8DJ is in everybody's interest. The 1300 C56/DL8UZ, C91J, XQOX, Y11HAS. only way to improve things in the 1400 A71BY, N6OHO/D2, FH5CEi, S21ZG, YllAJ. DX NEWS 1500 HC7SK, J73WA, TR8GA, VR6BX, ZD7DP, ZP9XS. future is to point out what one 1600 CEOZIS, FR7GG, VP8CKB (S.Ork), 9G1AA thinks could have been done bet- ACCORDING TO the Long Is- 1700 C91S, S79MD, VP8CMP. ter in the past. My comments land DX Bulletin, XT2B W in 1800 HC8A, TO5M, 3XOHLU. were written in that spirit. Burkino Faso, will end his stay in "Let us hope that discussions December 1993. In the mean- will continue in DX circles in Eu- while he keeps a schedule with rope and that common sense will OSL manager WB2YOH each NINE-BAND TABLE NO 6 dictate better behaviour and im- Sunday at 2100 on 14.211MHz, CALL 1.8 3,5 7 10 14 18 21 24 28 TOTAL proved operating standards. I and will take other callers when G3KMA 160 275 319 245 325 282 325 271 318 2520 should like to propose that the G4f3WP 139 266 301 209 324 270 320 247 307 2383 finished and make schedules for GAGIR 130 258 299 209 325 262 320 236 309 2348 DX-press all over the world com- other bands. The same source 03XTT 175 235 287 191 322 253 314 227 290 2294 piled comments after each major says that D2BG will be in Angola 03G10 71 215 278 121 325 235 325 213 310 2093 expedition, so that operators had G3TXF 83 187 245 129 302 152 301 115 268 1782 until July and has an excellent 64013K 123 160 215 121 282 173 258 166 242 1740 as much feed-back as possible. If signal near 14.205MHz at 1730 GM3PPE 69 164 199 175 266 223 248 177 217 1738 later DX-peditions used that in- and is willing to make skeds for G3JXN 49 125 192 126 275 201 280 183 280 1711 G3NOF 5 104 107 324 191 325 208 296 1560 formation sensibly, we should all other bands. PA3CXC, in G3WGV 66 122 175 146 227 187 224 150 211 1508 benefit. Once again - I apologise DX'press, says that the deterio- GIJJG 52 103 195 142 231 161 257 140 199 1480 if I created any hard feelings." rating situation in Southern Su- G4XRX 3 48 80 96 256 135 276 143 221 1258 G4NXCeM 6 43 95 231 123 250 137 236 1121 GOJNX is QRT and has been dan could end up in separate G3IAR 56 96 102 97 201 124 176 82 123 1057 for quite a long period. However. independent republics being AVERAGE 79 160 206 134 281 198 280 180 255 1773 he has just received many QSL formed in the territory. A confer- cards from stations all over the Next deadline • scores to reach 63010 by 8 July 1993. The entry level Is 600 total and ence was expected to take place there Is no need to work all bands. (Prepared by 63010). world who he has most certainly last month and new republics

12 RADIO COMMUNICATION June 1993 HF NEWS

Republic. The DXCC desk will leurs and assisting them to col- QTH CORNER accept QSL cards for these three lect their old equipment which C90AB John Weary, P.O.Box 42, Nacala. Mozambique. new countries starting 1 June was deposited with the police in ET3DX JH1AJT, Yasuo Miyazawa, PO Box 8, Asahi-ku, Yokohama. Japan 1993. The DXCC desk an- February 1982. He formally inau- 241. nounced that al the end of March gurated the Netherlands expedi- ET3SID S May, Box 60222, UNECA. Addis Ababa. Ethiopia. the backlog of unprocessed ap- tion to Dormaa on 28 March and VP8CKB via KI IED, L.Skillon, 72 Brook St, South Windsor, CT 06074. USA. plications was 1,830 (represent- ZD7DP P 0 Box 86, St Helena. as he says "we in Ghana are now ing 125,728 QSLs) - a big im- 4V2PK P 0 Box 1095, Port of Spain, Haiti. back in the fold". 5R8AL now via F6ACT, 13 Rte Communale No 1. F-64410 Bouillon Par Azac, provement since October last Dronz Arigho, G3NVM, re- France. year when there were 3,803 ap- cently visited Mozambique and 5X1B James Brandenberg. U S Embassy, Kampala. Dept ol Stale. plications representing more than reports that the licensing author- Washington, DC 20521. USA. a quarter of a million cards wait- ity Telecomunicacoes de Mozam- 901 AA via PA2FAS, Wim Faasen, Weeskinde rendijk 81, 3314 CM, Dordrecht, ing. Applications at the end of bique has now lifted restrictions Netherlands. March were taking nine to twelve and it is much easier to obtain a weeks to go through the system. licence. Previously there were 1730 and will make schedules for FO5DV, in French Polynesia, time restrictions and exact fre- 1993 WARC BANDS TABLE other bands. F1MXQ will be in has been reported on 7.007 and quencies to be used and times of 10MHz 18MHz 24MHz Total Cambodia until the middle of this 10.107MHz between 0400 and operation had to be specified. G3KKJ 77 113 114 304 month as XU5SE. HA7VK is re- 0700. V63MF is the new callsign Some information about G3IAR 87 89 48 224 issued to Mary Fox who is on a Uganda appeared in last month's G3IZD 30 80 85 195 ported to have successfully re- G2AFV 68 53 33 154 newed his XU7VK licence and two year tour with the Peace Corp column. Dronz also met Mr GOMHC 32 52 25 109 should be active until the end of on Woleai Atoll (0C-132) Micri› Mubiru, the acting Managing Di- GJ4GG 22 34 27 83 nesia. rector of the Uganda Posts and G3IQF 31 26 13 70 this month. VK30T, who is G4MUW • 40 19 59 XUOUN'sQSL manager, says that DX'press has been research- Telecommunications Corpora- G4XRV 55 55 there is a possibility that not all of ing into the rapidly changing maxi- tion, who told him that foreign GOKDS 12 12 the stations operating under the mum number of countries it is nationals can obtain permission auspices of the UN are properly possible to work on the current to operate in Uganda with the could be Bahr el Ghaza, Eastern licensed. DL1WH is in Bahrain DXCC list. On 31 December 1992 minimum of fuss and form filling. Equatorial, Western Equatorial, and on the air as A92WH. there were 325 but on 1 January All that is required is your original 1993 three new ones were added CEPT licence (full Class A) which and Upper Nile. RSGB DX News The ITU has now approved a (Bosnia, Croatia, and Slovenia). has to be produced at the time of Sheet says that John himself has new callsign series for Bosnia This made the total 326. How- application and that the issue of been active as PA3CXCISTO and Herzegovina. This is the series ever Abu Ail and Czechoslovakia the licence takes 24h maximum. advises that if you are looking for T9A - T9Z and includes T90A- have now been deleted and Mac- A clipping from the Vision (a Ugan- him 1.832, 3.510, 7.001MHz or T9OZ, T9OAA-T99ZZ. and edonia, and the Czech Republic dan newspaper) says that details about 30kHz up from the lower T9OAAA-T90777. The new na- and Slovak Republic added. So I of procedures and regulations edge of the other bands are places tional society has proposed to the make the total in mid-April to be governing amateur regulations he often frequents. Ministry of Communications that 327. I wonder how long it will be can be obtained from the U P and F6FYD is now in Liberia as T92AA-T92ZZ replaces the until it is possible to have 100 T Corporation Frequency Man- EL2YD and will be there for the former YU4AA-YU4ZZ, T93AA- deleted countries? agement Office, G P 0 Kampala. rest of 1993. K5LBU is in Sierra Y93ZZ = YT4AA-YT4ZZ, T94AA- Leone and is using the callsign T94ZZ = 4N4AA-4N4ZZ, and 9L1CB. The club station 9L1SL T95AA-T95ZZ = YZ4AA-YZ4ZZ. GHANA, UGANDA, DXPEDITIONS has been active on 14 and 21MHz A DXCC News Release from AND MOZA MBIQUE and is used by several operators IT IS REPORTED that PS7KM ARRL dated 13 April said that the and PT7AA are planning a visit to so that it is important to ask for the ITS OFFICIAL! I received a letter DX Advisory Committee had St Peter and Paul Rocks. Tim- QSL route for the particular op- from Kofi Jackson, 9G1AJ, dated voted to add Macedonia to the ing was not certain but if it didn't erator contacted if you want a 12 April confirming that the ban DXCC list for contacts made since take place last month it may be in QSL. According to DX'press he is on amateur radio in Ghana was 8 September 1991. The commit- June. working as a missionary and will tee also voted unanimously to finally lifted on 19 March 1993. be there for two years. G4ZQM is Advance notice of an intended delete Czechoslovakia w.e.f. 31 Kofi is at the Ghana Frequency visit by some of the former in Mozambique and on the air as Registration and Control Board December 1992, and from 1 Janu- VP8SSI team to Peter 1 Island is C90AB. He has been worked on ary 1993 to replace it with the and he says that it is now busy re- 14MHz SSB and is expected to given in RSGB DX News Sheet. Czech Republic and the Slovak registering former licensed ama- be there for a while. G3NVM re- The group is said to already have cently visited Mozambique and arranged transportation, landing met C9JA in Maputo who said permission, and the assurance of that there are now 19 licensed a licence, and is scheduled to stations in the country. FR5ZU land there on 1 February 1994. was expecting to be FR5ZUTT on There will be ten operators with Tromelin Is from mid-May for an four HF stations operating on all unspecified period. From Uganda modes/bands and the intention is 5X1B is reported active most days to stay for 16 days. Contributions from about 1900 near 21.030MHz are being solicited and are being or 30kHz up from the low ends of collected (as in the case of 14 or 28MHz. 5X1A is to be found VP8SSI) by AA6BB and KA6V on the low end of the 21MHz SSB who will also act as QSL manag- band between 1600 and 1900. ers. The team is expressing spe- John Layton, G4AAL, is in So- cial thanks to Norwegian ama- malia for a three month tour of teurs for making this expedition duty with Oxfam. He has been possible. More news later of worked as T5/G4AAL near course. 21.267MHz but he is a keen CW George, GM3DPL, is expect- operator so I suggest looking for ing to be in Barbados between him on that mode. OXers get together for a private 'pile-up': (I to r) Richard F bard. HKOHEU, of San 10 May and 1 June, staying at Andreas; Lloyd Colvin, W6KG, of Richmond, California; Ken Miller, K6IR, of 8P9FC's home and hoping to VQ9AC, on Chagos Is, has Rockville, Maryland; Iris Colvin, W6C11.., of Richmond, California; and Ron been reported on 21.315MHz at Szama. LU2AH. of Buenos Aires, Argentina. continued on page 16

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RADIO CO M MUNICATION June 1993 75 HF NEWS

continents five. The multiplier is contact me, through the usual the number of different VV call routes, or Peter Burden, G3UBX, HF NEWS areas and DXCC countries (in- VHF UHF the chairman of the VHF Com- cluding one's own) worked on mittee, at 2 Links Road, Penn, each band. Use separate log for Wolverhampton, WV4 5RF. continued from page 13 each band and send the usual NEWS Peter can also be reached via summary sheet. Mark multipliers packet radio to G3UBX have his own callsign which was the first time they are worked. NORMAN FITCH G3FPK GB7MAX and Internet E-mail to not yet know at the time of writing. Send logs to reach Radio Club 40 Esecialo Gardens. Purley. Surrey [email protected]. CAB IEZ GM4ZAA and GM1HPC will be Venezolano, Concurso Inde- pendencia de Venezuela, P with him. DSI 29.7-960MHZ At the time of writing the pro- Box 2285, Caracas 1010-A, Ven- posed visit by Romeo, 3W3RR, ezuela, to arrive by 30 Septem- THE EUROPEAN Radiocom- to Libya and Tunisia had not ber (SSB) or 30 October (CW). munications Committee (ERC) is EVERAL AURORAS materialised because he had The results of the 1993 ARRL occurred in April and carrying out the second phase of been ill. He was said to have 160 Metre Contest include the there was some en- its Detailed Spectrum Investiga- received no reply from Libya to callsigns of eight European en- hanced tropospheric tion (DSI). (The first phase - 3.4 to his request for a licence. trants, the only one from the UK propagation at the end 105GHz - has been completed, being G3BDO who scored 126 ofS the month. However, activity the results being published in a points. CONTESTS seems to remain at a low ebb with 176 page document, now the few readers bothering to send in subject of public consultation). CANADA DAY CONTEST ALL ASIAN CONTEST reports. To quote from the ERO's Infor- 0000 - 2359 1 July 0000 19 June - 2400 20 June mation Sheet "The aim of the (CW) ORGANISED BY THE NEWLY EURO MATTERS DSI process is to ensure that the formed Radio Amateurs of European administrations, indus- 0000 4 September - 2400 5 Canada. 1.8 to 144MHz, CW and IN THE APRIL issue I mentioned try, broadcasters, service provid- September (Phone) phone. Single-operator si ngle and the effect of EC legislation on ers, operators and users derive 1.8 TO 28MHZ. Single-operator multi-band, single-operator multi- British law and how European maximum benefit from the radio single and multi-band, and multi- band (less than 5W output), and standards and ERC Decisions spectrum, the limited natural re- op*erator multiband classes. Call multi-operator. Suggested CW may now supersede BSI stand- source. The management team "CQ AA" on CW "CO Asia" on activity frequencies are 25kHz ards and DTI and RA regulations. of DSI phase two will examine the phone. Exchange RSfT plus two above band edges (look on the These topics were discussed current use of the radio spectrum figures indicating age - ladiessend half hours) and 1.850, 3.775, during the VHF Committee meet- in the band 29.7 to 960MHz and 00! QS0s with Asian stations 7.075, 14.175, 21.250, and ing on 24 April. the changes that are likely to take count three points on 1.8MHz, 28.500MHz for SSB. The same We need to know of any pro- place over the next fifteen years. two on 3.5MHz and one on other station may be worked on each posals that could adversely af- The DSI will also address how bands. Multipliers are the number band/mode. Send RSfT and se- fect amateur radio operation. this frequency band is managed of different Asian prefixes worked rial number - Canadians send While the Committee does its best and administered in CEPT coun- on each band (following WPX RS/T and province or territory. to keep track of such develop- tries. The main objective of the rules). Note that JD1 stations on The multipliers are the twelve ments, members cannot guaran- DSI is to develop a European Minamitori Shima do not count provinces and territories and each tee to be aware of everything that Table of Frequency Allocation and because they are in Oceania. I ()SO counts ten points. Entries is in the pipeline. We have useful Utilisations to be implemented by have photocopies of the 1992 have be sent to reach RAC, PO lines of communication to vari- June 2008." rules available - the 1993 version Box 356, Kingston, Ontario, K7L ous EC regulatory bodies, but we Section 8 of the paper identi- had not yet arrived when this was 4W2, Canada, by 31 July. Official must have as much warning as fies 13 key issues, one of which being written. SASE please. forms are available from this ad- possible of anything that could is: "Are there any spectrally effi- pose a threat to the amateur serv- URE RTTY CONTEST dress on request. I can supply cient modulation or access tech- copies of rules but not entry forms ice. niques likely to make a significant 1600 19 June -160020 June (SASE please). If you hear of, or read about impact in the next few years, eg 3.5 TO 28MHZ following IARU anything of this nature, however linear modulation, CDMA etc?" Region 1 band plans. Use 45.5 innocuous it might seem, in a EXPEDITIONS This is one area where amateurs bauds speed and 170Hz shift. trade or professional journal, can play a significant develop- Send RST and CO zone (UK is GMOGMN AND GM4KHE will visit please let us know. Such tip-offs ment role, the attraction being zone 14). Score is one point for Barra and Vatersay Is (EU-10) will be treated in the strictest con- that nobody needs to allocate QS0s within own continent on between 10 to 17 June. They fidence should their divulgence large sums of money for R and D. 14, 21, and 28MHz, two for (DSOs have the callsigns GBOIB for use conflict with an informant's pro- Copies of this six-page docu- outside own continent, three for on Barra and GBOOH on the Outer fessional office. You can either ment can be obtained from the with own continent on 7 and Hebrides. Special OSLs will be 3.5MHz and six with other conti- issued. More information from Jim nents. The multiplier is the total of Bertram, GMOGMN, (tel: daytime DXCC countries and zones -041 649 4036, after 1800 - 0475 worked on each band added to- 24007). gether. I have not yet received the 1993 rules. THANKS VENZUELAN DX CONTEST TO ALL WHO sent in news items 0000 3 July -24004 July (SSB) and reports and also to the edi- 0000 24 July - 2400 25 July (CW) tors of the Long Island DX Bulle- 3.5 TO 28MHZ. Work anyone. tin (W2IYX), RSGB DX News Single operator single or multi- Sheet (G4DY0), the Lynx DX band, and multi-operator single Bulletin (EA2KL), the EA DX and multi-transmitter classes. Boletin (EA1QF), and DX'press Exchange RSfT and OSO number (PA3DZN). Please note that the Most of Scotland's keen VHF/UHF DXers attended a dinner In Aberdeen on 10 April. Starting at the extreme left and working clockwise, they are (from 001). !DSOs with own coun- deadline for the receipt of items Graham,GM8FFX; Ron, GM4ILS: Ray, GM4CXM; Stewart, GM4AFF; David, try count one point, in the same for the August column will be 23 GM4JJJ: Keith, GM4YXI; Dan, GMOONN; Melvyn, GMOGOL: Chris, GM3W0J; continent three, and with other June. Angus, GMOCDW; Andy, GM4IPK; Gavin, GM7LVJ and Allan, GM4ZUK.

16 RADIO COMMUNICATION June 1993 VHF NEWS

European Radiocommunications one point per kilometre on 2m, puter buffs, the parameters at RS52 on 4 March. At present he Office, Holsteinsgade 63, DK- 2pts/km on 70cm and 4pts/km on maximum are: solar longitude lacks TX power so is in the mar- 2100 Copenhagen. Denmark. It 23cm. The rules are: ". . . . ac- (LS) 76.7 degrees. Right Ascen- ket for a large PA at reasonable can also be downloaded from the cording to IARU recommenda- sion (RA) 44 degrees and Decli- cost. Taking advantage of 'ground BBS - 8N1 up to 9600Bd - on 010 tions." and entries should be sent nation (DEC) +24 degrees. The gain' Edward Allely, GWOPZT 45 35 432781. The deadline for by 1 August to yak Bettyán Zenithal Hourly Rate (ZHR) is (GDD), heard JA4BLC for 10min contributions is 28 February 1994 Rádióklub, Than K.u.1, about 60. GMT times when the at 1510 moonrise on 3 April; no and the VHF Committee is pre- GYONGYÓS. H-3200, Hungary. reflection effectivity exceeds 50% other stations were heard that paring a comprehensive paper Finally, reminders about the are: NE/SW 0430-0930 and 1300- weekend, probably due to the on behalf of the RSGB. It is Practical Wireless 144MHz QRP 1530; EJW 0700-1200: NW/SE high geomagnetic level. planned to submit the results of Contest on 20 June, and the 0300-0530 and 0900-1430: N/S John Regnault, G4S WX DSI phase two to the ERC and weekly Scandinavian Activity 0300-0800 and 1100-1600. (J002PB), was doing well in April CEPT Administrations in Janu- Contests every Tuesday. See Peak day for the Zeta Perseids up to the 13th when his azimuth ary 1995. page 16 in the May RadCom for should be 9 June - LS 78.6 de- rotator broke again. In his E-mail This phase of the DSI takes in further details. For information on grees, RA 62 degrees, DEC +23 report of the 26th, he said he was the 50, 70, 144 and 430MHz RSGB contests, please refer to degrees and ZHR 40. Prime waiting for replacement gears and amateur bands so it is vital the the Contest Classified section. times: NE/SW 0600-1100 and contemplating QSB-in-the-wallet RSGB and IARU Region 1 1430-1730; ENV 0830-1330; NW/ of $76. On the 2nd, J37AV (alias present a sound case for the re- PUBLICATIONS SE 0400-0700 and 1100-1600; W6JKV on Grenada) was audi- tention of these bands. With so N/S 0430-0930 and 1200-1730. ble for 25% of the 45min following many services clamouring for THE APRIL issue of The VHF- The Beta Taurids should peak on his moonrise. Many were calling spectrum space there is bound to UHF DXer is back to its standard 28 June - LS 96.7 degrees, RA 86 J37/W6JKV, the previously an- be fierce competition for frequen- 20-page format after the bumper degrees, DEC +19 degrees and nounced call, which begs the cies. March edition. It includes further ZHR 25. For the best times, just question, were they hearing Jim? Nevertheless, we should adopt letters about contest scoring; a add two hours to the figures for Conditions were fair at moonrise a positive approach, perhaps short piece on last year's IARU the Arietids, as the curves are on the 3rd with JA1KLX/1,I1KTC, even making a case for small, Region 1 VHF meeting and a list very similar. SM2CEW and I2FAK worked primary allocations around 220 of papers to be tabled at the Den from 1444. G3ZIG (J002) gave and 900MHz for experimenting Haan meeting this September, MOONBOUNCE John initial No:224 at 1556. Later with new techniques - 'He who by David Butler. G4ASR: a four- he completed random QS0s with dares, wins!' Of the 1.55% of this page 'Tech Slot' by G4DDK and CONTESTS LA8YB and SM5MIX. spectrum to which we currently G4SWX on noise figure meas- GOJHC forwarded a flyer from lnspite of a major magnetic have access, only 50-51 MHz and urements; an account of EME Giovanni Zangara, IWOBET, storm on the 4th, his sked with 144-146MHz is allocated on a activity at FF1EME and the usual about an EME contest sponsored FR5DN was completed at 1632 primary basis. band reports. Contact editor/pub- by the Italian national society, the for initial No:225. UA6BDC lisher Dave Hardy, G8ROU ARI. This Marathon EME 1993 (KN96C0) called him during the (QTHR), for subscription details. CONTESTS runs for the whole of the year and sked and he runs eight Yagis and The UKSMG's bi-monthly jour- there are many categories in the 1kW. DF6NA was initial No:226 THE WAB GROUP is promoting nal Six News is no longer jointly six bands - 144 and 432MHz, 1.3, at 1711 but ORM from stations two VHF contests in June. On the edited by Neil Carr, GOJHC, and 2.3, 5.7 and 10.4GHz. If you want working via the aurora was too 6th, there is the 70MHz Phone John Livesey, GOJJL, the latter full details, Giovanni's packet ra- great for further EME. On the 5th event, 1400 - 1800GMT, and on having stepped down due to lack dio route is IWOBET @ IWOCFV another aurora was in full spate the 27th the 144MHz ()RP Phone of sufficient spare time. The April and his 0TH is PO Box 36, I- at 1730 moonrise and John contest, 0900 - 1700GMT. For a edition, number 37, runs to 52 00100 Roma Centro, Italy. Ac- couldn't hear his own echoes, full set of contest rules. and sup- pages packed with relevant infor- cording to K2UYH's April News- even with ground gain. On the plies of contest stationery, send a mation for 6m enthusiasts. For letter, this year's ARRL contest is 7th. G4YRY was worked for 9 x 6in SASE and three first class details of the group send an SASE scheduled for 9/10 October and No:227. At 2200 he started with stamps to the contest manager, to Chris Gare, G3W0S, who is 6/7 November. Unfortunately the SV1AAF/3 (KM1710), complet- Gordon Horsfield, G4SKC) QTHR. second leg coincides with the ing by 2228 for No:228; Petro (QTHR). The May issue of CQ-TV, the European 24-hours Marconi Me- runs 1.2kW and four 17-ele Tonna The UK Six Metre Group is journal of the British Amateur morial CW contest on 144MHz. Vagis. running a 24-hour event on 5 Television Club (BATC), main- The next sked weekends are June, 0000 - 2400GMT, open to tains its consistently high stand- NEWS 29/30 May, with predicted sky all 6m operators, world wide. The ard, both for technical content temperatures in degrees Kelvin four UK classes are Single-op and quality of production. It in- The Newsletter advises that of 248/18 on 144/432MHz respec- fixed station. SWL, Novice and cludes a review of the Phoenix ZB2BU was due to leave Gibral- tively, then 26/27 June, 320/24. All-other, which last includes Port- 16-ele 70cm antenna by editor tar in May so ZBOT activity: ".. . . The in-between weekends are able and Multi-op categories. Mike Wooding. G6IQM. I enjoyed appears a lost cause." Mark had Moon in the south, apogee and Entry forms and log sheets are the humorous offering: 'How to one 70cm OSO with DL9KR last unusable due to Sun noise at available from the contest man- Repair Electronic Equipment' re- December. There is no further New Moon. ager, Cliff lbell, G1I0V (OTHR), printed from a New Zealand news from LU7DZ, YV5ZZ or on receipt of a large SASE. magazine. The advice includes: UA4API/A, mentioned last month. The Hungarian Radioamateur "Brandish a large screwdriver in a EA6/DF5JJ (JM19MN) is QRV 50MHZ Society. MRASZ, is promoting an menacing manner. This will on 23cm from his new summer annual contest on the third full frighten the instrument and dem- 0TH. Peter's QTH is C Garriga PROPAGATION weekend each June, this yearthe onstrate your knowledge of the 12, E-07460 Pollenca, Mallorca, The Six and Ten Reporting Club deadly 'short circuit' technique." Tel: 010 34 71 531426. issues monthly summaries of 19/201400GMT weekend. and theTime bands is 1400 144, - propagation data prepared by Ray 144MHZ ACTIVITY 432 and 1296MHz. There are five METEOR SCATTER Cracknell, G2AHU (HWR), and categories; Single-op. single While terrestrial activity appears circulated by Ian Brotherton, band; Single-op, multi-band; THE ARIETIDS meteor stream to be declining on the VHF/UHF G2BDV (DOR). In the March is- Multi-op, single band; Multi-op, should peak on 7 June, accord- bands, interest in EME mode is sue. Ray confirms what a poor multi band and SWL. Exchange ing to the prediction in the 1993 steadily increasing. Robbie month it was, due to generally calls, RS(T) plus serial number - Meteor Shower Calendar pub- Thomson, GMONXP (SCD), is unsettled to disturbed "separated on each band" - and lished by the International Me- experimenting with four 11 -ele geomagnetic conditions. On 4 Maidenhead locator. Scoring is teorOrganization (IMO). For corn- Vagis and copied SM5FRH at April he mentions that G2ADR

RADIO COMMUNICATION June 1993 17 VHF NEWS

(YSN) heard J37AV at 1400 on including ZB last year when he 50.100MHz at QTE 190 degrees; also worked OZ3SDL and LOCATOR SQUARES TABLE the GC bearing is 250 degrees. It 0E6XHF crossband to 6m. Starting Date: 1-1-1979 will be interesting to learn if Jim CallsIgn 50MHz 70MHz 144MHz 430MHz 1.3GHz Total 492 125 52 1072 was QRV at that time and that it 144MHZ G3IMV 403 wasn't some hoaxer. GJ4ICD 560 264 121 68 1013 GW4LX0 440 23 261 108 48 880 IN THE AURORA on 4 April, G6HKM 415 237 118 57 827 NEWS G1 UGH only heard GM3X00and G4RGK 167 319 182 58 726 G6HCV 435 246 681 TED COLLINS' G4UPS (DVN) G140 WA (1064), both quite weak. G4TIF 310 28 207 112 657 April Information includes more On the 19th, Terry heard GU7DHI G4DEZ 201 255 71 62 589 details of the proposed operation (CUR). Bill Meinerts-Hahn, GOEVT 230 12 249 65 1 557 G1SWH 245 33 179 63 9 529 from the Belorus Republic men- G3UOL (WMD), is sticking rigidly G8LHT 196 20 202 93 17 528 tioned on page 17 in the May to his 2.5W and seems to be GOJHC 462 48 - 510 RadCom. 6m ORGs are 50.095, doing quite well on °RP with 38 G4MUT 186 25 158 97 34 500 GW6VZW 332 143 6 - 481 50.145, 50.165 and 50.215MHz, counties and ten countries worked G3XDY 224 153 00 477 plus a beacon on 50.077MHz. up to 24 April. G4SWX gave up GOMGA 249 216 465 375 80 455 Dates are now 20 June to 2 July. on EME at 1727 on 4 April. turned GOCUZ G4SSO 80 269 99 448 Calls are EV5B and EV5C in his array to the NE and worked GU7DHI 329 106 5 440 K033; EV5D and EV5K in K042: YL2MB (K027) and UZ2FWA GOFIG 200 171 42 413 G4SWX 404 404 EV5M and EV5N in K041. They (K004) in the aurora. GOGMB 66 216 108 390 will be QRV on 28.885MHz and Arlen Pardoe, GMOHUO (FEE), G4RRA 299 80 379 14.345MHz. QSLs should go to G4YTL 38 279 37 354 reported April auroras on 4-6, 8, G6MXL 110 23 115 64 28 340 DL5BAC at Dorfstr 14A, D-2862 9, 13 and 21. UZ2FWA was a G1GEY 179 125 35 339 Worpswede 1, FRG. new country and square at 1803 00H VO 268 71 - 339 From Kuwait, 9K2MU is a new GONFH 133 26 101 51 1B 329 on the 4th, other countries worked G1UGH 196 121 317 station using a TS680S trans- being ON, PA, SM and G till fade- GW8JLY 271 36 307 ceiver and vertical antenna; out at 1930. GOEHV - 35 187 81 303 Murtada plans to make a 6-ele G8XTJ 147 126 273 The next phase started at 2230 GW4VE0 267 267 Vagi. QSL via 9K2AR at Box 77, 246 246 and beacons 0Y6VHF and G3FPK Safat 13001, Kuwait. ZD8LII is GW4FRX 235 235 GB3LER were still auroral at 0700 226 226 QRV again from Ascension Is. G4DOL next morning. From 1340 on the GM1XOG 181 181 LA6HL will be QRV from HP and G7L1J • 153 153 5th. he completed seven QS0s IP fields in Iceland again this sum- G7EWL 54 2 79 6 - 141 with G, DL and LA stations on BO 25 3 133 mer, using the call TF/LA6HL, 9- G3FIJ 1 24 CW. At 1815, GB3VHF was Tone G7CLY 70 60 2 132 29 July; QSL via home call 0TH. GWOPZT - 124 - 124 A but not GB3LER. He contacted G6ODT 3 57 62 122 ACTIVITY LA9HFA (J059) at 1742 on the GMOGDL 122 122 8th and LAOGH (J038) at 1545 GI10ET 88 29 3 120 TERRY CHAPLIN, G1UGH GOHDZ 11 67 78 on the 21st. From 1825 on the (SFK), reports auroral activity GMONXP 69 69 27th, Arlen made SSB tropo con- G4OBK 21 1 45 67 from 1700 for 15min on 4 April tacts with ON1ALD (J010) and G7JAF 53 3 56 with GM3X040 (1099) and G3UOL 42 42 G3NBQ (1083); PA3FOC was GB3LER heard. On the 27th. in heard. No satellite, repeater or packet radio OSOs. It no updates received for a year entries what appears to have been the will be deleted Next deadline is 1 July. first decent 'summer' Es open- GMONXP operated /P from ing, he worked five 9Hs in JM75, I076XA in the Kilsyth Hills. 1050ft ASL on 4 April. In 3.5 hours he S59AM (JN65), I8TWK and ings. In average winterconditions, Roger was a long time mem- IK8HJC (JN70), 14CIL (JN64). worked 28 stations on tropo and Chris works 80-100km with this ber of the prestigious First Class 13 via aurora including UZ2FWA IK8DYD (JN71) and 100EU station. Congratulations to John Operators' Club and used his CW and others in DL, El. G, GI. GM, (JN61). Paul Baker, GW6VZW Quarmby, G3XDY (SFK), who skills to establish a 144MHz LA and SM. Next day from home (GWT), wrote before the Es and worked F1GHP (1N96) for his record breaking distance of (I075XS), Robbie made another has been working some English 100th square on 23cm on 3 Feb- 2.138km to LZ via auroral mode. novice stations. He wonders 27 contacts in three hours with ruary. He has been QRV since He was a very keen LF and HF where the 2VVs are on 6m, as he stations in IN, 10, 1P, JN. JO and the late 1970s and wrote: ".... so band operator and it was a joy to hasn't yet heard one? JP fields to: . . show that it has hardly been rapid progress read his impeccable 'fist' in FOC G4UPS and G3CCH (HBS) interest still exists in two metres." compared with what can be done marathons. He leaves a widow, continue their daily tests at GWOPZT made auroral con- on, say. 6m.'' Dille, and a son. John Henry, to 0800GMT and very rarely fail to tacts on 4 April from 1648 to whom we convey our sincere 1757, but found activity a bit thin. make contact. Ted was alerted to VALE G3CHN condolences. the 4 April aurora by a telephone Best DX were GM4IPK (1099) and UZ2FWA at 1664km who call from SM7AED at 1530. Be- 1AM SURE that all readers will be COPY DATES tween 1545 and 2000 he made was audible for over 90mins. saddened to learn that Roger several contacts with G and GM Numerous PAs were coming Thorn, G3CHN, died on 30 April ON THAT SAD note, a reminder stations. OZ3SDL was heard both through on tropoon the 27th. plus at the age of 68. For many years that the August deadline is 1 aurorally and T9. Beacons cop- a few weak DLs and next day the his voice was regularly heard over July and the September one. 29 ied Tone A were GB3NGI, band was open again to PA and a wide area when he read the July. You can fax reports to 081- GB3RMK and SK6SIX. SM7AED DL. GB2RS News Broadcasts on 2m 668 5582, telex them to was heard or worked around 0800 from his clifftop 0TH on Bolberry 9312111074(CN), E-mail them to on 13-17 April. 430MHZ UP Down in Devon. He saw wartime CompuServe 70630,603. which service as a Marconi wireless can be accessed via Internet, or 70MHZ CHRIS SKELCHER, G3YHF operator in the Merchant Navy in via BT Gold on 76:MSX021. The (WMD). worked F. DL and PA the North Atlantic. He left the man at BTG's Helpline told me ROGER BETTS. GOTRB/G1EHJ stations on 27 April using one service in 1953 and became the you couldn't connect to the sys- (SFD), has been given an old 3- watt to a 19 -ele Tonna Vagi at Station Engineer of the Decca tem from Internet, etc. But G3UBX ele beam which he hopes will 10m AGL. Best DX was DJ9RX Navigator Station at Bolberry till found a gateway through improve his performance when (J043) at 740km, proving the he retired in 1984 and the family Interspan, whatever that server repaired. His country total is four, potential of ORP during open- moved to the Isle of Wight. is!

18 RADIO COMMUNICATION June 1993 QSLs, thematic collections etc. You name it, they have a sample, and will supply photocopies of • Radio Society of Great Britain particular cards to researchers. ehb b.:bp 1-: o QSL Ken says he would be interested in swapping cards with any club or UK amateur who has a similar JOHN HALL, G3KVA collection. He says he has many Code Lodge. Ipswich Road. Long pre-war G QSLs but he needs Stratton, Norfolk NR15 2TA. some modern prefixes. All the cards are well cared for and are indexed and some have been mounted on display boards for exhibition at schools and radio EREK HOLMES, GW3JSV, has kindly conventions. If anyone is inter- sent about 100 ested in the project they can get Commonwealth Century Club 9N1MM cards for all the 'gen' from Ken at 4 Sunrise QS0s with UK ama- Hill Road, Montrose, Victoria teursD in 1991. Derek managed to 3765, Australia. Thi• f co Certify MN Ml 1102.44 on Count., oi SOCnny mai nvon.. Nts rue 2 nu fut.. ..n.4 min Om.... , din have them collected by Don • I note with some interest an 'teem « MO r IX Common/ man CS. Sot Watson, GW3RJY, from the article by Bill Snyder. WOLHS, in American QSL manager for the WorldRadiodated February 1993 • Deb au. ez late Father Moran and wanted to where Bill got into some difficulty make sure they reached their with the way he had written the destinations. Many thanks to both date on a QSL card for an RTTY always try and sort out any prob- A WARDS of you for the trouble you went to. contact with Pakistan. The con- lem and reply promptly. I will personally see they go into tact took place on 10 April 1992 • Bill McConachie, BRS88921, HERE IS ANOTHER Radio Soci- the system and they should be and Bill wrote the date as 10/4/92 has sent me a picture of a very ety of Great Britain HF award to with the lucky recipients shortly. in the European fashion of DD/ strange QSL card from ET3YU try and obtain, though it is by no Another in the never give up hope MM/YY as he does with all cards which is headed "PIRATE RA- means easy. It is the Common- series! he sends overseas. The Ameri- DIO ET3YU" and purports to be wealth Century Club and the cer- • Derek Griffin, G8DLF/P, can QSL manager for the AP located in Addis Ababa. Bill says tificate is reproduced above. It V31DE, wrote to say he has re- station read this as October us- the operator was first class and may be claimed by any licensed tired to Belize and will be operat- ing the American method of MM/ QSLs very quickly. The RSGB radio amateur who can produce ing on the HF bands using an DDNY and sent the card back DX News Sheet has no knowl- evidence of having effected two- Icom 735 and 40 feet of sloping saying the station was not oper- edge of the station which appears way communication (since 1 wire. He will also be operating ating in October! All was sorted to be operated by a gentleman January 1984) with amateur ra- AMTOR and will have PACTOR out eventually but if you are really named Dragan Stojanovic. dio stations in at least 100 current when he can obtain an upgrade desperate for a card to be ac- • For some very good reason, Commonwealth call areas. for his PK232. He will be pleased knowledged it is these little de- the origin of which I cannot re- General rules are: to reply to any QSL cards sent to tails that can mean the difference member, we are sending all SV5 1. Contacts must have been him at PO Box 180, Belmopan, between success and failure. In and SVO/5 cards to the Radio made on bands below 30MHz. Belize. Central America. Derek such cases I tend to write the AmateurClub of the Dodecanese, 2. Contacts can be made from also says that all V31 stations month in words just to make sure PO Box 329, PO Box 329, Rhodes any location in the same can be reached through PO Box there can be no confusion. Island. GR 85100, Greece. DXCC country. 168 in Belmopan, Belize. • Now that we have reorganised 3. With effect from 1 July 1989 • Victor Digilevech, UC2A0, has • Ken Matchett, VK3TL. has writ- the Bureau at Headquarters mem- credits for contacts on the 10, written me a personal letter to ten abouta very interesting project bers may be interested to know 18 and 24MHz bands will be inform me that there is now a for which he is curator. The Wire- that one of two supervisors will be given. national Bureau for Belarus less Institute of Australia has set on duty from 9.15am to 5pm every 4. Contacts with land mobile sta- (White Russia) located at PO Box up what amounts to a QSL mu- day. They will be pleased to an- tions will be given providing 469, Minsk 220050, White Rus- seum and they have a collection swer any queries. Just ask for the exact location of each sta- sia. He says that any applications of over 400.000 QSL cards com- Jan or Doreen in the Bureau. If tion at the time of contact is for awards for the UC RC area prising modern DX, pre-war you prefer to write to me then I will clearly stated on the evidence should be sent there as well as all submitted with the claim for QSL cards. Victor is the new White the award. Russia National QSL Manager. 5. Mixed or single mode is ac- • Despite official listings I can ceptable authoritively state that the Italian The fees and entry details are National QSL Bureau is now lo- shown on page 3 of the RSGB cated at Via D Scarlatti 31, I Call Book. For a small additional 20124, Milan MI, Italy. charge recipients of the award • The new address for the Lux- can obtain a plaque commemo- embourg National QSL Bureau is rating their achievement. Details RLAOC, ASBL BP 1352, L-1013 from the HF Awards Manager, Luxembourg. Bill Ricalton. G4ADD, 4 South GX3 FIC.F/P • We have had boxes of cards Road, Longhorsley. Morpeth, » MAL DINT STATION... 1011EPH'S SCHOOL PM for the Finnish National Bureau Northumberland NE65 8UW. returned 'moved away' or similar. If you can manage to obtain all IORAino OPIU MPRMINIOPOWInInl There seems to be the odd prob- Commonwealth Call Areas then AT - WOO « -- -.JdNZ M U » M U lem there but Jukka Kavanen, there is a very special plaque CUUMUMblinir IL BAU M & OH3GZ, Varuskunta Rak 47 A8II, available to commemorate the N V? N VIA SULU U TY. SF-11310 Rithimaki, Finland has magnitude of that achievement. I very kindly offered to receive have no idea how many of the Pupils at St Joseph's Junior School in Salisbury designed their own QSL cards. cards on behalf of the Bureau latter have been awarded but I Here are three of the best. The reverse side gives station details. and distribute them. suspect very few.

RADIO COMMUNICATION June 1993 19 PROPAGATION MONTREALMEXICO ASCENSION Is MAURITIUS WELLI NGTON/L W EL L ING T O N /S TEHERAN OSAKA MALTAMOSCOW VANCOUVERLOS DENVER NEW YORKBERMUDA JAMAICA BARBADOS BOGOTALIMA BUENOS A/RESR DE JANEIRO Sth SHETLAND LAS PALMAS DAKAR LAGOSCAPETOWN HARARE NAIROBI HONOLULU ADEN FAIRBANKS FALKLAND Is S E YCHELL E S PERTH SYDNEY/L SYDNEY/S SUVA/L SUVA/S CYPRUS BAHRAIN COLOMBO NEW DELHI.SINGAPORE BANGKOK HONGKONG GIBRALTAR HF ** N. AMERICA ** S. AMERICA ** AFRICA ** OCEANIA ICELAND ** ASIA ** EUROPE (indicated by a dot) to 9 scale; the higher the number the greater the probability with 1 meaning 10 to 19 per cent of days, and so on. Additionally F-layer openings The provisional mean sunspot number for March 1993 issued by the Sunspot Data Centre, Brussels was 61.9. The maximum daily sunspot number was 98 on 21 Time / and 24 April and the minimum was 15 on 14, 15 and 16 April. The predicted smoothed sunspot numbers for June, July and August, are respectively: (classical ANGELES The time is represented vertically at two-hour intervals GMT for each band, le 00=0000, 02=0200, etc. The probability of signals being heard is given on a 0 ..2122 3331 .1111

..1121 2221 1 11 ..112112221 ..1111.1... ..1111.122. / GMT 1... 1 1 1.. 11 .1 11. ..111

13 1 2 at 50MHz and 1.8MHz are indicated by a plus (+) sign in the 28 and 3.5MHz columns, with these latter bands having a probability of 9. 0 24680 24680 20 000 0 1111 122 11 1... L. 28MHz 1.1 113123 123 123 .113 122 12 1213 1 1 F-LAYER PROPAGATION PREDICTIONS FOR JUNE 1993

11 23312331 3441 351 3541453. 5641 53.. 4542 4411 1221 343231.. .121 121 22112 32 1. 1 11 1 1. 0 2468 02 4680 20 0000 1111122 1 .2. .2. 31.21.. U2 P 3112 M 23 A 21 3 ..33 356 6 7652. 2 1..1 1.231.13 ..23 ..23..12 ..12 21..11 ..22 ... .23 - .11121 1 4 1 34556733 13133 24MHz .11.

2232442 4445654 3445211 21 1

121 1111.1 .22.33 I 23 34 333455233 32 322. 1 1 32Z3441 3 3 566 572 5763 6761 4442 5654

45534563 1 11 11221122 1233 11332233 232.232. 122.111.

11 53 1 3 3

method) 60, 58, 56; (SIDC adjusted values) 53, 50, 46. .11111232. 31. 41. 41. 5212 4 2146 556 5 776 1 .11112331. 5211 3232246 57875212 6 322643. 1 .345 1 5687 6 435 6445 58821.. 7 5225 6226 6346 2.45 3145 2135 5213 5332 4335 4 355 3445 6883246 7 3244 2133 2144 4335774 1. 1123 1123 1122332 0 246 80 24 68020 0000 1 111122 1111. 6885 3 3..223331. 12 21 12 .6 .1111 .2322 1111124 . 322 2235 .22 1 2245 .1 .121 .1 21MHz 3356 44517886 5567887 4335553 33_,4653 43 4652 43 45517851 4567888 45517876 4556543 43 4446776 21 6556786 1 64456884 6 16 85 21 3356 4563 1121 2341 3442 2442 685. 7422 7422 8533853 8751 7546 8 4 5 7 43 34 68 9 98 5 7 5 33 34 5 8 8 8 7664 1 11111 1112 2111 321 521..21 5311..1 631. 8534 8654 4. 8 7675 1 411 632337988 1 6575 64335897 3 335898 43 468995. 64 6464 4 53351 6554 64776563 4333 5453 21222112 21344443 0 24680 2 46 80 20 0000 11 11 122 1 11111 .11 11 . .111111 .1 1135432 112212133561 33323222 1111 1..2 3125j554 1 ..754 34 58 7 4 1 3 4 11111 111211 41543 22 32 32 43 18MHz 6677898 33 22 14334689 1345871 .3334689 4232247 2333357 2345898 2366 23 433 333 33 433 333 32 22

. 2135 2123 2236 2247 2258 6776 2236 4 2211 2331 68997898 4664 2453 4664 68985775 5787 5786 5775 5785 3353 5775 .121 85 37 42 17 .4 3246 2135 . 456 2244 1156 23432 24431.4543 77532111. 25 7753' 111. 8864311 88653111. 9 8 75 3 11 .. .37 98654111. 9 8 75 3 111 .9 .26 9 7 5 .111 2 3699973 8 3 3 1 .1 .126 89 9887 9 98 6 3 1 ..15898854 1..2689 9976 ...2689 9 8 75 11 .136 899873..1 3689 8 36 2 .1113689 9751..1 36 6322 9 6 5 1 . ..136 6 9 9 7 4 1 . .1136 8 98 4 1 . .11 1 36 8 8 7 4 1 . . .11 36 8 8 7 56 76 6 66 78 99 6754 52.5 9875444 8 64 1 . .113689 4112 1233211 1211 5 1 ..11 11368851 3. 1..1 6336 6 56 66 6 55 6798 0 2 4680 2 4680 20 000 0 11 11122 1331211 1231. 11113686 .1113688 34 11..1 1111379 1113574 14MHz 55 1.12688 56 111111. 11 .262 1.1..74 1112551 4333566 6566787 j2111.. .1111 1 .165

12685 26 5799 2326 6799 15 15 16 .1 78631 7 3 13 1531 25531 57531 37531 58531 36 2568631 3688631 48 78631 7631 36 7631 88631 367 7631 8863 136 -.158 358 88631 136 763187521. 763 523 268 763 87521....157 368 762 997532222478 368 7638863 368 8863 368 368 8863 368 8713 368 8852 884 863 862 41 368 257 368 368 863 752 985211123578 851 62 851 51 8765 9876554 9885444 6421411113578754333314688 2 3 253 1.131. 1243 3 3 1 .3531 .4531 . 0246802 68020 0000 11 1112 2 351 1331 132 2 3 .331....1. 33. 33. .23 .22 367 367 365 351 .2 368 368 353 10MHz . 544445577 252 12 231 2 2 3 2 4 3 4 153 698864 8853 5689 5689

4631 51 2531 2531 4631 6631 5631 6631 131 1 12 6654 61 15 6631 132 1 1 6 146 146 662 651 63 64 62 4 62 3 0 24 680 24 68 020 0 000 1 11 1 12 2 1 134 136 136 135 135 2 21 1 1 146 146 146 136 2

146 7MHz 22 222 1 1111j23 1 2 1 1 36 2345 468 31 1 6

8

33 ++3+52 23 2333 43 43 43 43 43 54243 43 43 43 43 42 4 442 3 332 3 0 2 46 802 46 800 2 0000 11 111 22 2 2 2 3

3.5MHz 24 2 24 4+35 24 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 2 2 c\Io RADIO COMMUNICATION June 1993 until national societies were formed in the principal nations, when federation would be possi- ble. It was agreed that its head- quarters would be in the USA at West Hartford, Conn. the Head- quarters of the ARRL. It also JOHN ALLAWAY. G3FKM seemed logical that since one of and its chief tasks was going to be the TIM HUGHES. G3GVV monitoring of, and cooperation with, organs of the ITU, its struc- ture should be similar. So it was decided ultimately that there would be three Regions, corre- HE PURPOSE of this new bi-monthly col- sponding with the Regions of the umn is to attempt to ITU: Region 1 would comprise give readers a better Europe (including the whole of understanding of the former USSR), Africa, and TIARU, what it is. what it does and parts of the Middle East. This was why. The awareness of IARU is the first regional organisation to not high in most countries merely be formed (in 1950). Region 2 because it works mostly in the would consist of the Americas, background, only becoming no- north and south, and Region 3 The 1981 IARU Region 1 Conference was held in Brighton. Pictured are: (I to r) ticeable to the members of a So- would include the rest of the world. Basil O'Brien. G2A MV, RSGB President; Lord Wallace of Coslany, F1SGB Past President: Lou van Nadort, PAOLOU, Chairman IARU Region 1: and Noel Eaton, ciety if that Society decides to The IARU in Region 1 is the long- VE3CJ. President IARU. organise one of the triennial Re- est established and the most de- veloped of the three with a mem- gional Conferences. So first of all The various aspects listed 60,000 VHF licensees with an- bership of 69 countries at the a little background to it all . . . . above will be addressed in future other 100,000 "just around the time of writing and with several In the mid 19th century the articles. corner"! A remarkable tribute to more (Macedonia, the Czech and telegraph system in one Euro- the persistent and enlightened Slovak republics and Bosnia pean country often could not be leadership of the Radio Amateur Herzegovina) going through the connected to that in the next coun- NEWS ITEMS Society of Thailand (and to the 25 election process. or so Post & Telegraph Depart- try. A message received at a bor- POSSIBLY THE MOST impor- The officially listed objectives ment officials who had attended der had to be taken across by tant news recently, was the pres- of IARU are "the protection, pro- one of the amateur radio admin- hand and retransmitted. To meet entation of one of the IARU Ama- motion, and advancement of the istration courses in the past!) New this rather unsatisfactory situa- teur Radio Administration courses Amateur and the Amateur Satel- Zealand has applied to partici- tion an international telegraph to twelve members of the Minis- lite Services within the framework pate in the CEPT Common Li- union (ITU) was formed. This or- try of Communications staff in of regulations established by the cence arrangement TR61 /01 and ganisation held international con- Dhaka, Bangladesh, by IARU International Telecommunication ZLs with General licenses qualify ferences, one of the first took President W1RU. Since 1979 Union, and to provide support to for CEPT Class 1 privileges, and place in London in 1903. Bangladesh Amateur Radio Member Societies in the pursuit with Limited licenses, Class 2 Subsequently the need for li- League officers have been work- of these objectives at the national [See 'Operate in ZL'. RadCom, censing and regulation of wire- ing patiently to regularise ama- level, with special reference to May 93, p5 - Ed]. less telegraphy stations became teur licensing in their country. A the following: necessary, and these too came problem seems to be the absence Peru is also making enquiries under the jurisdiction of the ITU. (a) representation of the interests of an amateur radio examination about taking part. This is of con- Such regulations and a treaty had of amateur radio at and be- system! However, for the time siderable significance since if suc- been signed in 1912, but it was tween conferences and meet- being, licenses are being issued cessful this would mean that the not until 1927 that the need to ings of international telecom- on the basis that the applicant concept had a foothold in all three revise and update these concepts munications organisations; has in fact passed an examina- Regions. was appreciated. In Washington (b) encouragement of agree- tion in another country. On the NOTE: Tim Hughes is the DC in October 1927 the Interna- ments between national ama- way home from Bangladesh Dick Chairman of the RSGB's IARU tional Radio Telegraphic Confer- teur radio societies on mat- Baldwin also visited Thailand and Committee and John Allaway is ence met, with 350 delegates from ters of common interest; discovered that there are now Secretary of IARU Region 1. 74 countries present. (c) enhancement of amateur ra- It was at this Conference that dio as a means of technical the interests of radio amateurs self-training for young people: Treat yourself to the bargain priced were first represented, and as a (d) promotion of technical and result our frequency allocations scientific investigations inthe were made on a world-wide basis field of radiocommunication; and what is more were harmoni- Adapt-A-Mast (e) promotion of amateur radio as cally related. These frequencies • Lifts to 25ft • Wall mounting a means of providing relief in were in the 1.7, 3.5, 7, 14, 28, and • Complete with all brackets, cable and winch the event of natural disasters; 56M Hz bands. • Accepts 2in stub mast • Adaptable to tilt-over (f) encouragement of interna- • Available bare steel or hot dip galvanised BS729 But prior to this, a group of tional goodwill and friendship: • Simple four bolt installation radio amateurs (some 250 strong) (g) support of Member Societies had attended a meeting in Paris Only £150 (self finish) £180 (galvanised) to consider the possibility of form- in developing amateur radio ing an International Amateur Ra- as a valuable national re- Call 05055 3824 dio Union. It was agreed that its source, particularly in devel- or write to main purpose would be the co- oping countries; and TENNAMAST SCOTLAND ordination and encouragement of (h) development of amateur ra- 81 MAINS ROAD international two-way communi- dio in those countries not rep- BEITH, AYRSHIRE KA15 2HT heoratfi cation, and it should be an or- resented by Member Socie- ganisation of individual members ties.

RADIO COMMUNICATION June 1993 21 Leeds (0532) 350606 .seel e ,'Oldetet ct eo Seiz et. e d Petet e, c d & e'cede& e coec e, opt\idee e s e d t \ c eee sde t s'cede i ele c ted ye Cs. •tle .v.rtt\'‘ 100 see\eCts_cst expte, %g et.de eedi e adec5 ett.e cojtItt '4: We e e et:et el,•p \,'e tec set, ee , ot.c\''t, ciq eettettes dtoss end 055 -ted ete S e cet e d et‘e,t‘l e %le e eeteites lt,sted dt J ‘ S ê e S te l , Vdee t . '0 1 .g i t ce le c eCon t e s t 4,14, 01' 090 s 1 -0 d.\\ fide\ el. I set 1 çtotetetets ,s ‘ 't% _1 t.\)Stet•tei ed etteees edtetrec r e cs), e l eet ecl .0`-‘t > \ \ I : 43opteit ,301 '0s .13,3: cesso%,Spectc11.e «1` APps\Ol , ons e 01-ece30 tleStsce e ,N2,1...v1 Co et , .q9 et t‘it-tald\e I eceet- $5i l'.t,,,rpsee . >5\ 01-e-ee e,\osc e, >4 5 e o e t ,1 e_ ete e \o pee" e op , , C • o e o e\ -,eCs• „ow bee tYt • Full• B u• Duplex i AM l Capability t - Crossbcrnd inC • TC S Rx S& • Frequency D Dual operation TMF• E n VHF/UHF reception cod e/De coverage: Handheld code on sa me or dif ferentbands cyssc ce , . ece 3 00 -500 , 8 00 -950MH z 144-146, 430-440 MHz Expandableto 110-180, sce ‘ isec 1 s •• N -1es •ONI • DUALBAND HANDHELD . t,let . ' . es. e ,0 • c/w• LCD MH 2 9A frequency 2B S• p ea Enhanced ke• r display /MT i• c IM save ER roph P /A LARM on• rog ef function and Built rammab unmost c le tc i on in l s for ock VOX w i extended for th "Hands Free" operation • Supplied withFNB28 NiCad8( charger. WE W KNO YOU'LLTRY ONE TODAY LIKE — IT ! ! !

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Ocun--5pm Mon-Fri 9en-lpm Sat Up to £l000 instant credit, a quotation in writing is available on request, subject to status. nal program for the TNC1, TNC2, wrong in the not too distant fu- S79FIB, P2OX, VS6VA, ZD7SM KPC-2 and, in particular, a smart ture! and ZF2UF. Philip also mentioned an early WL multimode digital communica- 24MHz: A71C W, FK8CP, tions controller for the KAM, morning tune across the DX por- SORASD, TZ6LYN, V63MK, MFJ1278 and the PK-232. 'PC- tion of 80 metres. He heard Eric, 3XOHLU, 5NOCEP, 5T5SN and GU2FRO, working ZL4B0 who NEWS Ham' is a menu driven computer- 9J2AS, ised logbook. It displays or prints commented that ZL7AA was on 21MHz: BV4AS/7, N6OHO/D2, BOB TREACHER BRS 32525 QS0s sorted by callsign in alpha- 3.785MHz. A tune to that fre- 93 Eltank Road, Eltham, London numeric order. It also searches quency provided Philip with a very ET3YU, FK/DJ5CQ. S21ZH, SE9 ICU for and displays all OSOs with a nice new one on that band. N90QS/T5, V63CS, V73C, specified prefix, generates DXCC Albert Tideswell, BRS48462, YI9C W (ex YI1BGD) and 5R8DJ. status automatically, updates did not mention ZL7AA in his 80 18MHz: A22BW, C91J, DU1AK, award records directly from log metre loggings, but had heard J52AG, JT1BV, W5IJU/KP1, entries, analyses contest QS0s VK5MS, A61AD, JTOAJ (it has VK9LM, 3D2AA, 4S7EA, 5H3MT S WE ENTER the summer months, for duplicates and scoring, and been reported in the DX press and 9G1AA. many listeners turn much more. that this station is a 'pirate'), 14MHz: FC5C, F040K, FT4WD, their attentions to For more details on both these 9V1X0 and 4S7VK, which was H44MS, N9NS/KH5K, KH8/ chasing DX on the products you can write to GOBIX Albert's number 301 on 80 metre DL8UFF, TN1AT, V63MF, A SSB. A superb achievement. at Readycrest Ltd, 19 Hill Chase, VHF spectrum. Every year I hope VP8CGK (South Georgia), Walderslade, Kent ME5 9HE. Perhaps he will provide a few that more listeners will follow suit, ZD88V, ZD9CO, ZS6AIS/7P8 The second bit of software more details so I can pass on but each year I am disappointed. and 9M8YL. Perhaps this year will be differ- news came from Geoff, GJ4ICD. details of how long this feat has ent. The HF SWL will be even He provided details of 'The 1994 taken, what antenna has been One thing seemed certain, the more reliant on 14MHz during the PC HF Spectrum'. This seems to used, etc. I have 276 current coun- bands were remaining open summer. so it is interesting to find be the listener's guide to short tries heard on the band and new longer. Indeed, DX could still be a different aspect of the hobby to wave on disk with over 15,000 ones are few and far between. heard on many occasions on 21, occupy the mind. Monitoring VHF entries of marine, broadcast, etc Indeed, apart from the new Euro- 18 and 14MHz after 2100h. Keep - especially 50MHz - can take up stations heard. Release date is pean Republics, the only new one the reports coming during the a great deal of time. Good Spo- expected to be in the autumn, but recently has been SORASD. summer months as it will be inter- radic E openings can be fairly advance information can be ob- Looking at recent conditions esting to see how the bands be- short - especially at 144MHz - so tained from Geoff Brown, and other reports to hand this have, and please do not forget to much time can be spent listening GJ4ICD, at Belmont Road, St month, it seems 'mixed' is the send in your reports of VHF hap- in the hope that something will Helier, Jersey JE2 4SD. best way to describe the bands. penings. Spend a little more time materialise. The wait can most One day the Pacific was coming listening on 18MHz - there is plenty of DX on that band to keep certainly be worth it, but it is the WAB NEWS ¡non 14 and 21MHz, but 24 hours uncertainty of it all that will prob- later the bands were almost most people happy! ably keep most SWLs glued to THE LATEST WAB Newsletter closed. On the whole, conditions 14MHz. It is, however, worth not- arrived shortly before my dead- were good enough for listeners to FINALE ing that during the summer Spo- line. An insert provided the min- log several new ones on each of radic E season 28MHz will pro- utes of the WAB AGM. As part of the higher bands. Some of the NEWS AND comment for the vide listeners with many of the the Chairman's opening remarks, best callsigns on offer were: August issue should reach me elusive European countries that mention was made of the passing 28MHz: A22SC, C91J, FH5CB, no later than 16 June. are just not audible at other times away of two stalwart listeners - of the year. Signals will invariably Frank Parkhurst and Hedley be 5 x 9, so do not forget 28MHz Falkinder. A number of HAB (or 24MHz for that matter) if you Awards were presented to a want to add some 'easy' ones to number of SWLs who were your countries score. present. Mention was also made of Chris Gibbs' achievement in NETS LIST hearing 4,200 WAB areas.

I STILL HAVE some copies of the DX HAPPENINGS Nets list available that I was offer- ing in April for anyone sending DAVID WHITAKER, BRS25429, 60p to cover copying and post- sent a report from Tenerife on his age costs. The list gives details of holiday listening from the R-2000 190 'Nets' and is essential rig- he took with him. Best DX was a side material for those who enjoy KH6 on 7MHz SSB. During the doing their DXing the 'easy' way! ARRL SSB contest, 80 countries had been heard in nearly eight SWL SOFTWARE hours listening. Philip Davies, G1EMD, like I STILL HAVE a good deal to many other reporters did not learn about computers in ama- manage to hear the KH5/KH5K teur radio, but I know that finding expeditions. Others only reported a program which will keep my hearing the KH5K weakly and station log and make contest log- briefly on 14 and 18MHz. With ging even easier would be a tre- conditions to Europe from the mendous asset. I have recently central Pacific area likely to be received details of software which poor for the next four years I others with more experience may imagine that any big expeditions find useful. will wait for an upturn in condi- First, Readycrest Ltd market tions before large amounts of several Shareware programs by money are spent activating a re- G3ZCZNV3. 'Lan-Link' - Version ally rare one - like 133. However, Mick Toms, BRS31976 has an FT101 and FR101 providing dual VFO facilities 2.00 is a personal packet termi- someone will hopefully prove me on all bands including VHF.

24 RADIO COMMUNICATION June 1993 THE THREE POINTS OF THE KENWOOD TRIANGLE REPRESENT ADVANCED TECHNOLOGY, QUALITY AND STYLE

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HOME AUDIO, CAR AUDIO, COMMUNICATIONS EQUIPMENT, TEST AND MEASURING INSTRUMENTS, TELECOMMUNICATIONS odd contest and been amazed at tion, every contact you make will however are the stations who in- the ease with which I could work count for points. The information sist on continuing to call even test quite large numbers of US sta- exchanged does vary from con- after being told that the contact is tions on 40m and 80m with just test to contest, but listening to not valid! 100W and loading up 30ft of my what the contesting station sends You can spend as long or as Exchange 70cm transmit feeder! you will almost always show what short a time as you like in the Secondly, if we are talking he needs from you. If you get contest, and maybe, at the end of ANDY COOK, G4P10 report, serial number, and locator, it all, you will think - 'Hey - I've Fishers Farm Colchester Road, about working rare countries, Tendnng. Clacton-on-Sea. Essex. there are many opportunities to then give him the same informa- actually made several QS0s C016 9AA be taken in this area also. Al- tion back - pretty straightforward here'. If this turns out to be the though, particularly at the start of when you think about it isn't it! case, why not send log into the the contest, the pile-ups can be But there are some occasions adjudicator? You are most un- pretty vicious, as the event when you will come unstuck fol- likely to come last, it makes the RE YOU oneof those progresses they thin out consid- lowing this simple rule. For exam- results table form a better repre- people who has de- erably, and the small station ple, from a Swiss station you may sentation of the level of activity, cided that contests stands a much better chance of get report, serial, locator and can- and it helps to encourage others are the worst thing to being heard - probably a better ton. If you are in the UK, giving onto the bands in the future. hit amateur radio chance than outside of the con- your canton is obviously a bit Asince the abolition of the Artificial test since DX stations are rarely tough; so, don't worry about it, PRACTICAL Aerial licence? Well - if you are, on for 48 hours at a stretch. and just give them the informa- don't stop reading now, and take WIRELESS 2M ORP The same situation applies in tion which you do have. If any- a few minutes to discover why VHF/UHF contests, and perhaps thing else is needed, the con Mark Davis, GOKHB, changed his even more so. It is only during tester will ask you for it. mind from this viewpoint. contests that some of the very Another common misconcep- Mark says he has a love/hate biggest stations on the best sites tion is that, if you are not entering relationship with contests. When are put together and activated. It the contest, you should not send he first became active on HF with is also very likely that the longest a serial number. Again, this is not a direct conversion 80m Rx, he distance QS0s you make will be the case - if the exchange in- decided that he absolutely hated with well sited portable stations, cludes serial numbers; then, even contests since the high levels of who are only active during con- if you are just floating around activity on the band during the tests again extending your range giving a few points away, still events gave his receiver a hard over that in 'peace time'. send 001 to your first contact, time. Also his first contact with a then 002 to your second, and so contest station almost put him off on. GIVE A FEW radio for life - the high-speed At HF, life tends to be a lot 'pulse' of CW being a bit too much POINTS AWAY more complex - I don't think any- to handle. one has taken to exchanging in- FROM SOME of the correspond- After a little perseverance, Mark side leg measurements, or the ence I have received, one of the realised that contests posed a conjugate of the complex antenna major factors which stops people marvellous opportunity to work impedance of your previous OSO from taking advantage of the con- DX, particularly if you area smaller partner at that particular fre- tests to work a few people is the The Far Canal Contest Group, GOSEA, station. He migrated his station to quency; but, listening to some of misapprehension that you can't operating In PW ORP contest. 20m and, obviously deciding that the exchanges around, you do 2W was far too much power, ran make contacts with a contest sta- begin to wonder sometimes! Also, BY NOW, some of you will have his new system at that pile-up tion unless you are entering the at HF, there are quite often some taken up my suggestions in the contest. This is most certainly not crushing level of 800m W into an QS0s which will not count for April column of contests in which the case. In general, a contest 30m end-fed antenna. For a very points. An example of this is in station is likely to be even more to get your feet wet. For VHF long time, the best that Mark had the RSGB 21/28MHz contests, in pleased to have you reply to his types, there is another good op- worked was one W8 station; but which inter-UK contacts do not portunity on Sunday 20 June, CQ calls than would a normal that was until this year's ARRL count for points. My view is that, station - making as many QS0s 0900 - 170OUTC in the shape of CW contest. During that event, if you have no written information the PW 2m QRP contest. Power as possible is always the founda- he was astonished to work a total about the contest, and after a tion of a big score. output in this event is limited to of 20 'stateside' stations. reasonable amount of listening 3W, meaning that virtually every- The great difficulty you are What this all goes to prove is you cannot work out what the one is on an even footing in this faced with is knowing what infor- that contests can be a marvel- exchange and valid contact mix respect, and making it viable for mation you have to send to the lous opportunity for the smaller is, then you should go on and call people to go portable with very contester. The obvious solution station to work DX (whateveryour a few people. They will soon let small stations. The contest ex- to this is to look up the rules in individual definition of the term) you know if they need different change is report. serial number RadCom (either in the Contest with relative ease. information, and if contacts be- and locator and a very simple Classified pages for RSGB There are at least two main tween particular countries are not scoring system is in place - fur- events, or in the HFNews column reasons behind this situation; valid for points in that event. This ther details are in June Practical for some non RSGB HF events). firstly, if we are talking about pure technique is very definitely sec- Wireless. It is remarkable what If you have access via packet distance, contests encourage the ond best to getting the correct can be worked with only 3W, par- radio to a DXCluster node; on mega-stations onto the bands. information from whatever ticularly in the middle of the spo- most of the UK nodes, you can try These are the people who have source, but is very much better radic-E season, and perhaps en- typing SHOW/HFTEST JUN or huge antenna systems, and, in than spending the weekend curs- tering this event will demonstrate SHO WNHFTEST AUG for ex- general, these guys are obviously ing that contest and not mak- what fun contests can be, and ample to get information on con- going to stand a better chance of ing any QS0s! Don't be put off if encourage you into the RSGB tests for a particular month. If for working a small station at this end the operator appears to snap at events later in the year. The sun whatever reason you end up be- than will stations running aver- you - not only does efficient oper- even shines for this one some- ing no further enlightened, then age antennas. This is particularly ating demand the minimum of times too! take a listen around the band to so since they are likely to have time spent talking, but the So, good luck everyone, don't what is being worked by whom, paid careful attention to their re- adrenalin can sometimes make forget to enjoy the field days, and and what information is being ceive systems. In the past when I people act a Mile sharply in the I look forward to working all the passed. have not had HF antennas on my heat of the contest. What does non-contestants as well in future tower. I have popped up for the At VHF, almost without excep- justifiably irritate the operator events!

26 RADIO COMMUNICATION June 1993 1r THE THREE POINTS OF THE KENWOOD TRIANGLE REPRESENT ADVANCED TECHNOLOGY, QUALITY AND STYLE

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AXMINSTER CUM BERNAU LD NEWCASTLE Reg Ward & Co, 1 Western Parade, Lowe Electronics, Cumbemauld Airport Lowe Electronics, Newcastle Airport, West Street, Axminster, Devon. Cumbemauld. Tel: 0236 721004 Woolsington, Newcastle. Tel: 0297 34918 Tel: 0661 860418 DONCASTER BELFAST Alan Hooker, 42 Nether Hall Road, NEWPORT PAGNELL GM Electronics, 1-3 Evelyn Avenue, Doncaster, South Yorkshire. Photo Acoustics Ltd, 58 High Street, Belfast, Northern Ireland. Tel: 0302 325690 Newport Pagnell, Bucks. Tel: 0232 471295 Tel: 0908 610625 EALING BIRMINGHAM Martin Lynch, 286 Northfield Avenue NEWTON LE WILLOWS South Midlands Communications. Ealing. London. Tel: 081 566 1120 Amateur Radio Comms Ltd, 38 Bridge 504 Alum Rock Road. Alum Rock. Street, Earlestown, Newton Le Willows EASTCOTE Birmingham. Tel: 021 327 1497 Merseyside. Tel: 0925 229881 Lowe Electronics, 223 Field End Road, BIRMINGHAM Eastcote, Middx. Tel: 081 429 3256 NORFOLK Ward Electronics, 422 Bromford Une, Eastern Communications, Cavendish EDGWARE Ward End, Birmingham. House, Happisburgh, Norfolk. Haydon Communications, 132 High Tel: 021 328 6070 Tel: 0692 650077 Street, Edgware, Middx. BOURNEMOUTH Tel: 081 951 5782 NORTH HUMBERSIDE Lowe Electronics, 27 Gillam Road, Peter Rodmell Communications, Field FIFE Northboume. Bournemouth. Head House, Leconfield, North Jaycee Electronics, 20 Woodside Way, Tel: 0202 577760 Humberside. '11: 0964 550921 Glenrothes, Fife. Tel: 0592 756962 BRISTOL NOTTINGHAM HANGER LANE Lowe Electronics, 79 Gloucester Road, R A S Nottingham, 3 Famdon Green, A R E, 6 Royal Parade, Hanger Lane. Patchway, Bristol. Tel: 0272 771770 Wollaton Park, Nottingham. London. Tel: 081 997 4476 Tel: 0602 280267 BRISTOL HAYWARDS HEATH AMDAT, 4 Northville Road, Northville PORTSMOUTH Bredhurst Electronics, High Street, Bristol. Tel: 0272 699352 Nevada, 189 London Road, Portsmouth Handcross, Homards Heath, West Hants. Tel: 0705 662145 CAMBRIDGE Sussex. Tel: 0444 400786 Lowe Electronics, 162 High Street, SLOUGH HOCKLEY Chesterton, Cambridge. Lowe Electronics, London Heathrow, Waters & Stanton Electronics, Spa Tel: 0223 311230 6 Cherwell Close, Langley, Slough, House, 22 Main Road, Hockley, Essex Berks. Tel: 0753 545255 CARDIFF Tel: 0702 206835 PMR Ltd, Industrial Estate, Gwaelod-y- STOURBRIDGE LEEDS Garth, Cardiff. Tel: 0222 810999 Dewsbury Electronics, 176 Lower High South Midlands Communications, Street, Stourbridge, West Midlands. CLACTON ON SEA Nowell Lane Ind Est, Nowell Lane, Tel: 0384 390063 Coastal Communications. 19 Cambridge Leeds. Tel: 0532 350606 Road, Clacton on Sea, Essex. LEEDS Tel: 0255 474292 Lowe Electronics, 34 New Briggate, CORK Leeds. Tel: 0532 452657 Intronic Ltd, Windsor Hall, MAIDSTONE Glounthaune, Cork. Eire. Lowe Electronics, Chatham Road, Tel: 010 353 2135 4422 Sandling, Maidstone. Tel: 0622 692773 COUNTY TYRONE Tyrone Amateur Electronics. MATLOCK 44 High Street. Omagh, Co Tyrone, Lowe Electronics, Chesterfield Road, Northern Ireland. Tel: 0662 242043 Matlock, Derbyshire. Tel: 0629 580800

KEN WOOD

HOME AUDIO, CAR AUDIO, COMMUNICATIONS EQUIPMENT, TEST AND MEASURING INSTRUMENTS, TELECOMMUNICATIONS reproduced here. The materials required are as follows: • 22SWG aluminium sheet cut into two rec- Noeece tangles to suit your rig. • Two 3mm pop rivets, or nuts and bolts • Four stick-on feet or grommets McDee cool • A rectangle of fabric such as 'leatherette' • Some contact glue such as Evostick IAN KEYSER, G3R00 Rosemount. Church Whitfield. Dover. Have the following tools ready: Kent CT16 3HZ • Steel Rule, Tri -square and pencil • Bench sheets • Folding bars or vice • Hatchet stake (for bending sheet metal) ONE OF THE MOST awkward pieces of • Rawhide faced or soft faced mallet. equipment to use and store while in the shack • Hand drill with 2, 3 and 10mm drills, (the is the handheld transceiver. Quite often they 10mm drill is for de-burring) are placed on stacked shelves where they • Small metal file may get hidden or, even worse, dropped while retrieving a book. MAKING THE STAND Clive Williamson, G4IEB, has overcome this problem with a very elegant solution. It START BY DECIDING on the size of metal takes less than an hour to complete and costs rectangles you require. Mark them out in one Make this extremely useful stand for your handheld virtually nothing for the components. For the corner of the metal sheet, using the steel rule, transceiver as described by G4IEB. younger Novices still at school this project tri-square and pencil. Observe the photo- the vice and tighten it .... then carefully bend. could be carried out in a design/technology graph carefully, and you'll see how this is The obtuse-angled panel is easily bent as lesson. done. Then cut out the two rectangles with the shears and smooth the edges with a file. required by hand. On the piece of metal which is bent to an acute angle, mark the centre line Make a 'safe edge' along one short edge of THE PROJECT of its 'base' and drill two 3mm holes in suitable each piece of metal. To do this, about 8 THE DESIGN DESCRIBED here was for positions for fixing the two pieces of metal millimetres of metal is bent over to 90° in the Clives son's KT44 70cm handheld but with together. After this, don't forget to deburr the vice or bending bars. Then, using the rawhide very slight adjustments to the dimensions, it holes. mallet, the panel is bent right over so that a would be suitable for any handheld. If in Now, using finger power, hold the two smooth tight 180° bend is produced. doubt, a cara model could be constructed first pieces together and find the position where to check the suitability for your rig. Clive's your rig will be held firmly. Mark the position descriptive notes for building the stand are MARK THE LINES of the holes in the undrilled piece of metal and DECIDE WHERE deburr. The two pieces are then pop riveted THE bends in the together, or alternatively, small nuts and bolts metal have to be could be used. made and mark the Metal polish and a soft rag will bring a shine lines with the pencil. to your stand and then the finishing touches Practical Antennas Carefully align the can be added. These could include a set of lines to the edge of feet and some suitable fabric covering. for Novices

THIS GUIDE, written specially for UK Novices by John Heys, G3BDQ, tells you how to build good, simple antennas (aerials) for each of the Novice bands from 1.8MHz (short-wave) to 434MHz (UHF), plus construction projects to ensure they are working correctly. A chapter is devoted to safe common sense ways of setting up antennas for transmitting and receiving. This book will suit not only Novices, but also any beginner looking for easy-to-build antenna systems that really work. 60 pages.

Available from the Radio Society of Great Britain. immimimmwmmfflimim...1 RSGB Members price: £4.83 (inc. post & packing) RSGB Non-members price: £5.49 (inc. post & packing) RSGB OPEN DAY Send fo:

Radio Society of Great Britain ' Saturday 19 June ' Lambda House, Cranborne Road, See page 5 Potters Bar, Herts. EN6 3JE

28 RADIO COMMUNICATION June 1993 the November RAE and both were Chief Instructor for Norfolk since like to feel that they are an impor- successful. Six more passed the the beginning of the Novice Train- tant member of any community, December NRAE so radio-activ- ing Scheme and sixteen local and will give their best when they NO VICE ity in this area should increase. Novices and one from Norwich feel that their efforts are appreci- Of those six, I know four callsigns. bear testimony to David's dedi- ated. Are local Novices encour- There is Chris, 2E180E, and cation and the Club's commit- aged to join in all activities. Are NEWS three Matthews, 2E1 BOB, BOE ment to training. their opinions sought and dis- MRS ESDE TYLER, GOAEC and BOO respectively. The enthusiasm did not end cussed? Are activities arranged 43 Nest Est. Mytholmroyd. Hebden All this is interesting enough, there. Stan, 2E0ABQ, was elected to interest a wide age-range? Is Bridge, W Yorks, FIX7 58H but there is more. The Mayor of Club Chairman last year, becom- help and advice given from the Calderdale, Bill Carpenter, is an ing Vice chairman this year when more experienced when a new amateur with the callsign G4KQJ John, 2E1BEE, was elected to aspect of the hobby is being (generally known as King Queen the Chair. If any other club has a opened to them? Are visiting Jack) and when he was asked to similar situation with Novices speakers aware that Novices - of LTHOUGH I did not have any candidates present the certificates, he man- holding such high offices, we any age - may not have the back- for the NRAE papers aged to find the time among his would like to hear about it. The ground knowledge to ask ques- in September or De- many other duties to do so. His club also has many keen Raynet tions without feeling that their lack cember, I was inter- address to the assembled school members. Raynet came into be- of knowledge shows? Aested to read the City & Guilds was a very good commercial for ing because of the East Coast While not all Novices are young, reports on them. I was curious to the hobby. flooding that occurred forty years please remember that once you know if there had been any sig- Five more youngsters took the ago when many lives were lost. too felt a midget among giants nificant improvement in the an- March NRAE - including one Earlier this year tides rose over and needed guidance. Give them swering of questions on safety. young lady. Emma is eleven and four metres above the normal the help that you once received - The September report shows that is the sister of Matthew. I wish level causing constemation - thus you could soon find that they have a question on the colours of wires you success Emma, gentle fe- showing the need for Raynet in a huge contribution to make to used to wire a mains plug cor- male voices are rare in this area threatened areas. everyon e's advantage. A few lines from someone to tell how your rectly, attracted the right answer as in others. A further class of Across the length and breadth Club extends the welcome may by 71% of candidates - an im- four is running at present, under of the country, amateurs give up give ideas to others. Novices, this provement, but still not good the guidance of Tony, G70KW; their time to practice emergency is your column, you tell us. enough - nor safe enough. Roy, G3NBI, and Richard, procedures. When such an Concerning the use of the sta- G3UGF. Others are joining a emergency arises, the Raynet tion al a temporary location the waiting list as there will be a break system moves into action with MORSE HELP report said: "Half the candidates for Summer holidays. each member of the team thought that notice should be I am planning a visit to the knowing exactly what to do - it is HOW DID you learn Morse code? given to the Secretary of State school some Saturday morning too late learning a procedure There are many methods - all of rather than the Manager of the when I will be shown the con- when disaster has struck. In all which are right for someone. The Radio Investigation Service". I struction projects - of which there areas Novices have joined their time comes, however, when lis- could have answered that one are many - going far beyond the fellow amateurs in Raynet tening is absolutely vital. wrongly and wondered about requirements of the Novice exercises and have proved willing, Morse tutors help a great deal other Instructors. So I asked a course. capable and valued. when learning and reading ran- few amateur friends, including one Rishworth School has a well- dom letters and numbers. Com- However, there are restrictions or two Instructors. Several an- appointed radio shack. If you hear on what Novices are allowed to puter programs too could give swered correctly but quite a per- random letters - or random words GOSQA, please answer - you do - in spite of the fact that most centage immediately said "DTI", could be speaking to one of their - and again give much needed Controllers would trust them with which means that, unintention- home-grown products! practice. Also useful are trans- their lives. David makes the point ally, some potential Novices are missions on the bands, friends' that given an emergency of 1953 possibly being misled. Page 79 of NEWS FROM proportions, Raynet would not be tapes, club members giving prac- the current RSGB Call Book is able to cope without Novice com- tice before the main attraction for headed 'Radio Investigation Serv- GREAT YARMOUTH mitment and help. Which brings the evening, evening classes and ice Addresses' and the informa- practice between yourselves DAVID, G30EP, wrote to me re- me to David's next point - the tion in the block below the title when you are ready for using a cently telling of Novice activities value placed on Novices and the gives the information. When next key. Some are perhaps more re- within the Great Yarmouth Ama- treatment they receive from Clubs you are wearing your Instructor's alistic, but most are heard in rela- teur Radio Club. David has been and other organisations. Novices hat, please ensure that a similar tive comfort with few background question would gain full marks. distractions. That mark could be crucial! For the Class 'A' licensees of In the general comments at the yesteryear, with two separate end of the September report there transmissions in the test - plain is a bouquet for Instructors gen- language and numbers - the learn- erally, which you may like to read. ing, practice and test did little to "The paper was very well at- prepare anyone for life in the real tempted by most candidates indi- world of communication on the cating that they were well pre- bands and some amateurs, after pared for the examination" - so trying and feeling hopelessly in- well done Instructors, take a bow. adequate, lost the will to perse- vere - and consequently lost the RISH WORTH hard-won skill. That is no longer the case, of course. SCHOOL The Novice 5WPM test has ASSEMBLY IS early at Rishworth always been in the form of a School - at 8.40am but by invita- proper QS0 including callsigns, tion - we were there to see certifi- numbers for signal reports and cates presented to the young- some procedure signals. Now the sters about to enter the hobby. I 12WPM test follows the same was very impressed. The Mayor of Calderdale, Bill Carpenter, G4K0J, presenting RAE and NRAE format and after it, the nervous There were two entrants for certificates at Rishworth School. can conf idently embark on a QS°.

RADIO COMMUNICATION June 1993 29 WATERS & STANTON ELECIRONICS ALINCO KEN WOOD YAESU ICO M DIA MOND MEI MICROSET TONNA RE VEX

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E•IBM Packet TOC for IBM-PC £59.95 RP-IM Interlace lead PIIIM•I £10.95 channel numbers! Packet TOC Commodore 64 £59.95 ORP.20 310m I watt ORP TX •VX0 £21.95 The new DR-130 gives you dual option. IIRP-40 Vim I wan ORP TX•VX0 £31.93 Use it like any regular mobile an enjoy ORP.80 80m I watt ORP TX•VX0 £31 95 11R-20 20m direct coov RX t11.9.5 high performance from one of the 111240 40m direct cony RO £1.95 smallest mobiles in the business. You'll 1111-80 80m direct cone RO cal .95 FR-146 2rn FM receiver £31.95 * You get 51/ Watts love the new large display and the case AR-1 AM VHF airhand RO £29.95 * 20 memories of operation. Select the 'secret" channel DR-112E 2M FM 45W FR-1 FM broadcast radio R X £22.95 mode and your rig is locked to provide 14 memories AA-7 Active ant for 11F/VIIF £29.95 * 100 memo option CASE Case/knob set any kit £14 .95 channel readout only. What's more only 6 frequency steps * CTCSS encoder HOWES KITS loaded channels are displayed. Full scanning 25-2 11F active ant amp t8.95 *130- 174MHz RX AA.4 IIF/LIHF active antenna C19.P5 "Channel" selected Expanded receive * Extended TX option 511-116 Active VHF airtund ont C1895 1 75011z tone AP-3 Auto speed Noce-sot C16.95 * Programmable line out A81,-5 Dual FVW filter C15.95 Mir & hardware AT-I60 80 & 160m TO C1A"/PHONF. £39.95 * Reverse repeat SEND FOR COA-2 Buffer for pre.amp C5.95 CM-2 Quality rote with VOGAD £13.95 * 1750Hz tone and more! BROCHURE Your chance to purchase £S.L.4 SSEliCW filler I2V C10.93 CTD-39 IIF bands • 6m ATU 30W £39.95 a top performer at a discount CTX-10 4Orn 3 11: 13.8 V ORP TX C15.95 £349.95 CTX110 80m 5 W 13.0 V ORP TX f15.95 CV•100 HF to VHF converter £27.95 CVF-20 20m VFO for MTXICTX TO £1I.95 CVF-10 40m VFO for PITX/1:11( TO £1I.95 CVF-80 80m VFO for PITXICTX TX £11.95 Now you can get oui- quality service whilst DCS-2 Smelt. .DXR 1 0.DCRX.T RF3 DFD-1 Digital readout £49.95 DFD-5 Digital «Bela, -331111,. 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Head office: Retail and Mail Order: 22 Main Road, Hockley, Essex SS5 4QS. Tel: (0702) 206835/204965. Fax: 205843 Retail only: 12 North Street, Hornchurch, Essex. Tel: (0708) 444765 A Multiband Doublet For 1 0/18/24MHz

V C Lear (G3TKNNO1XG)

38ft- 9in 38ft - 9in

2ft long drop wire 2ft long drop wire 18ft-9in 18ft- 9in

25ft-10in (23ft- 4in of 300S? slotted-ribbon) HE MULTIBAND DOUBLET shown in Fig 1 covers the 10, 18 Open wire line spaced 2 to 6inapart and 24MHz bands. It has a low impedance coaxial feed, and should require no ATU. In this Trespect it is particularly suitable for transceiv- ers having solid state PAs, that normally require a well matched load if they are to deliver full power output. The aerial is simple to construct, being lightweight, inexpensive, and requires little if 50S? coaxial cable formed into a no pruning. It should be of particular interest 12-turn coil, 6in dia: to act as to those who already have a resonant aerial an R Fchoke system for the other HF bands, and require just one antenna to cover all of the WARC allocations. 50S? coaxial cable feed to transmitter THEORY OF OPERATION IF WE TAKE A POINT a quarter wavelength, RSGB or odd number of quarter wavelengths from Fig 1: The Doublet is easy to build and can give excellent results. the end of a wire, we arrive at a point which has maximum current, and hence low imped- To gain a better understanding of the an- hence where the current antinodes are closer ance. By observing some odd multiples of tenna in terms of current distribution, radia- together. quarter wavelengths for each of the WARC tion resistance, and radiation pattern, it is Measurements with a well calibrated gen- bands using the formula; easier to analyse the operation of the aerial eral coverage receiver (Eddystone EC10) L = 234/f on each of the WARC bands. and noise bridge placed at the bottom of an where L = Length in ft of one quarter wave and open wire (2in spacing) stub indicated reso- I = Frequency in MHz 10MHZ OPERATION nance around 9.9MHz, with the aerial at about 30ft. A 300U slotted ribbon stub produced THE CURRENT DISTRIBUTION on 10MHz we find the following: resonance at 9.7MHz. However, in both cases is shown in Fig 2. From this we can see that it was obvious by observation of the noise null wave on 10.125MHz = 69ft 4mn each leg is 0.42 wavelength, and each half of that the antenna had a reasonably flat re- the antenna carries in-phase currents, thus sponse between around 9.5 to 10.2MHz, and 3/4 wave on 18.1MHz = 641t 7in providing slight broadside gain. In other words although at 10.1MHz the feedpoint could be it operates as two half waves in-phase, or 74 wave on 24.9MHz = 65ft 9mn expected to show slight inductive reactance two-element collinear. The theoretical gain of (Ra+jX), no problems were encountered in As can be seen from the above, these two half waves fed in-phase is 1.9dB. How- practice. The aerial was fed with power from lengths are fairly close together. In the ever, one could expect slightly less than this both a valve PA transmitter (Drake T4XC), multiband doublet, the open wire line or 300U where the elements are slightly shorter, and and a TS130S with solid state PA. The latter slotted ribbon stub, operates with a standing produced its normal power output without the wave on it in each case. and the total length need for any external ATU. SWR figures of wire from one end of the aerial to thecentre, across the 10MHz band were around 1.1:1 then down to the base of the stub is such that measured at the transmitter end, and differ- a point of low impedance is achieved on each ent lengths of coaxial feed line produced of the three bands. The aerial is optimised for similar results, indicating the line was operat- 18.1MHz, where the length from one end of ing in a flat condition. the aerial to the centre then down to the base of the stub is five quarter waves. On 10.1MHz The radiation pattern at 10MHz will be it is a little short of three quarter waves, similar to a two element collinear array, maxi- RSGB and on 24.9MHz it is very close to seven mum radiation being broadside to the wire, quarter waves. Fig 2: Current distribution at 10MHz. with a slightly narrower pattern than a dipole.

RADIO COMMUNICATION June 1993 31 A MULTIBAND DOUBLET

18MHZ OPERATION would load into the antenna, problems were encountered with the TS130S, which would ON THIS BAND the antenna is three half not now deliver full output at 24.9MHz. waves centre fed, and hence we have a low The aerial was lengthened slightly at the impedance point at the centre of the aerial ends to bring its point of resonance nearer to (see Fig 3). The stub, which is exactly half a 24.9MHz, but this produced an unacceptable wavelength at 18.1MHz, acts as a 1:1 imped- match at 18MHz. and a very slight deteriora- ance transformer, and simply transfers the tion at 10MHz. It was therefore decided to n.1 RSGB low impedance seen at the centre of the aerial attach short loading wires a half-wavelength to the feedpoint at the base of the stub. It (at 24.9MHz) from the ends of the antenna. Fig 3: Current distribution at 18MHz. should be noted, however, that the imped- This meant the loading wires were at points of ance at the centre of multiple odd half wave- high impedance at 24.9MHz, but points of length aerials increases slightly with the lower impedance at 10 and 18MHz. As a number of odd half waves. In practice, no '- result their effect was less on these latter two problems were encountered in this latter case, bands than it was on 24MHz operation. ; and SWR figures around 1.2:1 were obtained In practice the resonant frequency was on the 18MHz band, with the TS130S giving lowered from 25.7MHz to 25.2MHz using two full output. 2ft loading wires as shown in Fig 1. Although eRSGB The theoretical radiation pattern for a three there was a slight lowering of resonance on half wavelength aerial consists of four major the 18MHz band, it did not cause any prob- Fig 4: Current distribution at 24MHz. lobes, each at 42 to the wire. The gain of lems, and there was certainly no noticeable each major lobe is in the region of 1dB com- difference on 10MHz. The SWR obtained at produced in Fig 5. It was found possible to pared to a dipole orientated to give maximum 24.9MHz was 1.4:1, and the TS130S was just squeeze on 10 turns of UR43, wound as radiation in the direction of one of the main now delivering its full output. shown in the diagram. If UR43 505.2 cable is lobes. The loading wires provide a means of prun- used throughout, no breaks in the cable are ing the antenna for the best compromise necessary until it joins onto the stub. How- 24MHZ OPERATION match on 18 and 24MHz, and depending on ever, UR67 heavy duty 50U was used to keep its height above ground, and general siting, it losses to a minimum at 24MHz, and a well ON 24MHz, EACH LEG is approximately one is probably worthwhile carrying out a little weatherproofed barrel connector was used to wavelength, and the antenna functions as a adjustment of these wires. join the PL259 plug on the end of the balun to two wavelength centre fed system. The cur- It is worth noting that when open wire line the PL259 on the UR67 coaxial feeder. rent distribution is shown in Fig 4. However, was used for the stub, the problem did not The simple choke balun is probably to be when resonance was checked using the noise arise on 24MHz; the bandwidth appearing preferred for this antenna, as some slight bridge, the aerial was found to resonate at greater on each band. Therefore it is only reactance is present at 10 and 24MHz. Many 25.7MHz. This meant that the impedance at worth fitting the loading wires if matching of the commercial baluns are trifilar wound on 24.9MHz would have a reactive component difficulties are encountered on the 24MHz a ferrite core, and while they work in a satis- present, which would be capacitive, so that band. factory manner into a resistive matched load, the impedance would be of the form (Ra-jX) The radiation pattern at 24MHz will pro- internal losses can increase if they are used The SWR was in the region of 2:1, and duce multiple lobes, tending towards the plane where the load becomes reactive. However, while the T4XC transmitter with its valve PA of the wire, but with slight gain in each of the a commercial *W2AU' type balun was tried major lobes. both with the open wire line and 30052 slotted ribbon stubs, with no noticeable drop in per- RF CHOKE formance. BALUN CONSTRUCTION MISSED THE G B2RS TWO SIMPLE RF CHOKE type baluns IF THE STUB SECTION is made from open were tried, and both wire line, this can use 16-18SWG wire, spaced worked well. anywhere from 2 to 6in. Spreaders may be BROADCAST AGAIN? The first type was easily made from sections of plastic curtain made by simply coil- rail, or small diameter PVC piping. If plastic WOULD YOU LIKE TO HEAR the latest Amateur Radio News as ing up the coaxial curtain rail is to be used for the spreaders, it soon as it is available? With a new service from the RSGB you can feeder to make a 12 is essential to make sure it is of all plastic always keep up-to-date with the latest developments by telephone. turn coil, Gin diam- construction, with no metal strengthening rod eter at the point of running through the middle. Constructional connection to the details for the open wire line are shown in FOR THE LATEST NATIONAL AMATEUR base of the stub. Fig 6. The second type Slotted 30052 ribbon feeder (type GMP6) RADIO NEWS FROM THE RSGB: was one described by offers another alternative for the stub, and is G2HCG, [1]. It is re- less obtrusive than open wire line. However. 0336 40 73 94 Calls cost 36p/min cheap rate, 48p/min all other times

The recording is updated on Thursdays and contains the complete text of the national GB2RS news. A proportion of the call charges goes directly to the RSGB, helping to keep subscription rates down and improve services to you. RSGB ›.11n.mum ol ferrite 5 turns on Another service from the Radio I oroid each side Society of Great Britain RSGB Fig 5: RF choke balun.

32 RADIO COMMUNICATION June 1993 A MULTIBAN D DOUBLET

the weight off the points of connection to the 40ft, with both ends sloping down to about 'T' piece. 25ft. With the antenna running N/S, particularly OPERATION ON THE OTHER good results have been obtained on 18MHz BANDS on both long and short path into VK. When the Short lengths antenna was first tried on 10MHz, the first of wire twisted THE DOUBLET HAS ALSO been used on all report received was a S9+10dB from North around feeder lo prevent bands for 7 to 28MHz inclusive, by extending America which was rather encouraging. How- slipping ;,r)prox the stub into the 'shack' and connecting to a n ever, it did seem rather directive on 10MHz, balanced ATU. Although this takes away the and as expected the best reports come from principal advantage of the doublet using just stations in an E/W direction. one coaxial feed, it does offer the opportunity On 24MHz it has given good contacts into to extend its coverage. Africa and California, but does appear quite It should be remembered that when used in directive as one would expect with a multi- this way. the impedance offered to the ATU lobe radiation pattern. will be dependent upon the length of open RSGB wire or slotted 30012 ribbon between the CONCLUSION Fig 6: Detail of open wire line construction. aerial and the ATU. An ATU with balanced antenna connections should be used. THE ANTENNA DESCRIBED offers a simple It can be affected more by weather than open On 7MHz the antenna is only 11.5ftshort of and inexpensive way to sample all three wire line, although the differences are prob- a double extended zepp. The double ex- WARC bands. ably undetectable. The solid dielectric 300f..2 tended zepp is basically two five-eighths- It should be noted that one is more likely to ribbon is not to be recommended, but if it is wavelength sections fed in phase, and can have a greater degree of success with a used its lower velocity factor (normally about offer 3dB gain over a dipole. Maximum radia- simple wire antenna at 18 and 24MHz be- 0.82) must be taken into account when calcu- tion will be broadside to the plane of the cause the general level of ORM is less on lating the stub length. antenna with a bi-directional lobe narrower these allocations than on the more estab- The 30012 slotted ribbon was connected to than that expected from a dipole. lished amateur bands. the centre of the aerial using a short length of On 21 and 28MHz the doublet will offer multi-lobe radiation patterns in much the same polypropylene cord, threaded through one of FURTHER READING the slots in the feeder, to take the weight of the way as it does at 24MHz. cable. This relieved mechanical strain at the Ill 'Controlled Feeder Radiation', B Sykes, G2HCG, RadCom May 1990 soldered joints. RESULTS A dipole 'T piece was used to connect the THE ANTENNA HAS BEEN used mainly on [2] 'The G5RV Antenna - up to date', L Varney, ribbon to the coaxial cable via the RF choke the WARC bands in the form shown in Fig 1. G5RV, RadCom July 1984 balun. Again a small piece of cord was using both open wire and 30012 slotted ribbon [3] 'ATU or ASTU', L Varney, G5RV, RadCom threaded through the slot in the ribbon to take stubs into coax. The apex height has been August 1983

PCB AND KIT SERVICES FOR RADOM PROJECTS

PCBs KITS

G3BIK BATTERY OPERATED AF OSCILLATOR AND KITS ARE AVAILABLE AS ELECTRONIC PARTS ONLY. WAVEFORM GENERATOR (September 1990) PCBS ARE AVAILABLE FROM BADGER BOARDS. PCB Layout 93990 £4.70 G3TS0 Mulliband Transceiver POA Full Kit (including box) £25.85 G3TX0 3 Band (Excl PA) £168.75 G4WIM 50/70MHz TRANSCEIVER (May/June/July 1990) G3TS0 Frequency Display (Excl LEDs) £25.30 G3TS0 80m SSB Transceiver (Excl Tune Cap) £87.03 Complete set of boards 567WIM90 £67.56 G4WIM Dual Band Project POA G4PMK Spectrum Analyser £53.00 G4PMK SIMPLE SPECTRUM ANALYSER (November 1989) G3RVM Ultimate Keyer £13.90 RF Board 118946 G3TDZ White Rose Rs (Main Board) £18.50 Video/sweep board 118947a I Prices on request G3TDZ White Rose Con Fundamental' £7.10 G3TDZ White Rose Ax Cony SS 0/T Osc" £9.20 Marker generator/PSU 118947b G3TDZ White Rose Ax Cony SS OfT Ose and mult• £10.95 Complete set of 3 boards 1189SSA £17.62 • Converters exclude crystals which must be ordered as a separae dem from our catalogue selection G3TXQ TRANSCEIVER (February/March 1989) G3BIK AF Oscillator £16.30 Main IF/Audio 028945 £11.75 G4ENA ORP + QSK Transceiver 80m £32.10 VFO 028946 £5.55 G4ENA CiFIP + QSK Transceiver 160m £33.10 G4ENA ORP + QSK PCB only £5.90 Ortyer/Preamp 028947 £6.75 G4ENA QRP + QSK Ready Punched Caso POA Low pass filter 028948a £7.65 Technical Topics 144Mliz Doppler £4.00 Band-pass filter 028948b £4.70 First Steps. John Case PSU £29.00 Control board 038942a £5.30 First Steps. John Case PSU (case and metalwork) £6.70 Prices shown are inclusive of P&P. Regulator board 038942b £2.35 Kits for D-i-Y Radio projects also available Complete set of 7 boards 0289TXO £27.61 The above prices are for full component kits. The bigger kits are produced in BRS54049 DUAL CONVERSION MULTIMODE RECEIVE modulo form il the constructor wishes to spread the cost. Please telephone for a full list. JAB's aim is to have kits available oft the shelf. When demand may IF/AF STRIP (May/June 1985) be high following publication you are advised to allow up to 28 days or chock PCB LAYOUT 643585 £12.75 availability by phone first. Available from:' All prices include VAT, postage and packing J.A.B. Electronic Components These PCBs are not available from RSGB HO, but direct from Badger Boards. The Industrial Estate, 1180 Aldridge Road, Great Barr, 87 Blackberry Lane, Four Oaks, Stilton Coldlield, 874 4JF. Tel: 021 353-9326. Birmingham 644 8PE. Tel: 021-366-6928

RADIO COMMUNICATION June 1993 33 IDE A S FR O M A B R O A D

HE NEED FOR extra-clean SSB figures may be irrelevant but for ORO CW signals is never more obvious than they are not; the rise and fall of dots and during VHF contests. The stacked dashes produces a wide band of key clicks. Vagis at your adversary's ORO Bi-polar transistors basically do as well, or station on the next hilltop may well rather as poorly, as valves in Class B; in wide- Tput 10mV on your receiver's input. Even if • band HF amplifiers this can be improved to your receiver can handle that, and few rigs the values for the 4CX350 in class AB by can, the other station's intermodulation (IM) negative feed-back. In VHF and UHF ampli- products are likely to wipe out the sub- fiers, negative feedback is difficult to apply, microvolt DX signal you want to hear. When hence the deplorable performance often en- a MOSFET VHF linear was offered for re- countered from this type of amplifier during view, a comparison with valves and bi-polar contests. transistors was irresistable. Note well: any amplifier, if overdriven or The BEKO amplifier uses two Motorola wrongly biased, will pollute a band and dis- MRF-150 devices in parallel; it includes a TR A N S L A T E D AN D EDI T E D credit its owner. The BEKO HLV-300 can be seen at the regulated 50V @ 10A power supply, a blower BY ER WI N DA VI D, 04 L 01 and a simple temperature-compensating bias UKW-Berichte stand at HamRadio '93, supply which at +3.7V sets the optimum stand- Friedrichshafen (25-27 June). Its price is ing current of 2 x 2A. More than 30 transistors approx £1000 + VAT. MOS-FETs permit high-power VHF are used in circuits for control and protection against excessive drive, SWR and tempera- with spectacularly low intermodulation • B Korte, Ruessstrasse 6, D-8000 Munich 50. ture. distortion. Guenter Schwarzbeck, DL1 BU comments in cq-DL 1/93 on

TEST RESULTS 0 his test of the BEKO HL V-300 300W I c1134.. 01.1211.11992 1 1 t1 ; 12 200%9 PEP 100 THE LINEARITY PLOT shown in Fig 1 clearly 144MHz amplifier, designed and 1,4100.300504 I R 10W PEP shows the excellence of the BEKO amplifier. manufactured by Bernhard Korte, ZO 0 i /24144.3504Na IIl The 1dB gain compression occurs well above DG5KAZ*. 300 I its 300 watt rated output and up to 200W the I -.40 0 gain is a virtually constant 13.5dB. All two- 1143 ; IM) 900 / tone tests were done at this 200W PEP PAS I ,i II 1MS I 400 output. 1/47 l Ie47 IM products in an amplifier's output are PCB-track inductors and chip capacitors and 70 0 not with coaxial low-pass filter sections. The meaningless unless its drive is at least an 40 0 J .) ) second and third harmonics were down 72 -,- - order of magnitude cleaner. No amateur SSB 900 4 and 86dBc respectively and all higher har- Is4•3304 transceiver is that clean. Two 10W CW trans- -200k-1504-100k-90s . .400+1000 44900+2000 100 0 mitters, however, through 6dB attenuators monics below —90dBc. Ref 144.3300/4Hr 50.04/17/04 Pes on kHz Inc 901044 20446/0.4 4.4 b. 2 •Obriz and a coax combiner, yielded a drive with I M3 The insertion loss of the amplifier on re- ceive, 0.4dB, is less than expected; this points at —48dBc or 54dB below two-tone PEP; no Fig 2: MOSFET 145MHz linear. Two-tone higher-order I M products were visible. Fig 2 to the use of good coaxial relays. ntermodulation spectrum. 200W PEP output red, (blue). nput blue. With this driver, the HLV-300 measure- COMPARISONS ments were —41 to —43dB for IM3, —52 to THE SAME DRIVE WAS applied to a tradi- 4 —56dB for IM5, and —65 to —62dB for IM7; tional valve linear with a 4CX350 in class AB : 0 2 beyond that nothing. rated at 700W PEP output; it was dissipating 'I 18 2 Harmonic suppression at a rated 300 watt a whopping 250W (>2kV at a standing current CW output into a 5O2 dummy load was excel- of 120mA) and yielded 400W PEP. IM prod- 20 2 I

) i II ;III .‘ i lent, especially so as it was achieved with ucts were —29dBc for IM3, —32dBc for IM5, 30 2

ll :i? \ —47dBc for IM7 and CO 2 —49dBc for IM9 I A 58 2 INPUT (Watts) (Fig 3). Reduced I j ,U 2 3 4 6 810 15 20 25 32 drive (and output) did 00 2 1414 t A j -I sw...4.) Lee .4.9 500 not improve the IM 74I 2 582 +56 400 performance. In class comression, I B, as recommended ià 2 1 300 Pe1 1‘4•330014/44 50.0044/4.• Res tr. On: for 400W FM or CW Inc 508/1r 20,nsido, 4.0 0. 2.134/14 +54 output, the figures were —20, —25, —36 200 Fig 3:145MHz valve amplifier (4CX350 In Class AB). DLIBU,1992 and —48dBc respec- Two-tone intermodulation spectrum. 400W PEP 150 Ti e tively. For FM these output red, Input blue. 1002 80 o IF YOU are currently 60 te` 50 enjoying reading someone +46 40 else's copy of RadCom, 30 +44 why not get your own 20 by joining the RSGB. +30 +32 +34 +36 +38 +40 +42 +44 INPUT (dBm) There are other benefits too! Fig 1: MOSFET 145MHz linear. Output vs Input. The blue line denotes perfec linearity with a gain of 13.5dB. At 300W 'rated' output compression is 1dB.

34 RADIO COMMUNICATION June 1993 BACK TO THE FUTURE? Not THE MFJ-8100 IS a rather nice really amateur radio, but we looking short wave receiver kit thought readers might be which has just been released. It interested in the Roberts 'Revival'. Note: Product news is compiled from press releases sent in by the covers 3.5 to 22MHz and is a This is a rather attractive LW/ manufacturers and distributors concerned. Details are published regenerative design, capable of M W/FM portable, looking in good faith but Radio Communication cannot be held respon- AM/SSB/CW reception. The MFJ- externally just like the company's sible for false or exaggerated claims made in the source material. 8100 has a FET RF amplifier, R200 model of the late 1950s, dual FET regenerative detector complete with a wooden case. and LM386 audio stage. Internally however, it uses the Because the receiver is de- latest components and tech- signed for short end-fed wires, nology. The little set aroused the makers claim that it is able to considerable interest here in the provide a performance similar to RadCom office, and it will be that obtained from an active aerial fascinating to see if the style and gives beginners a chance to catches on. Must a radio have a obtain good short-wave signals black box to sell these days? from very modest aerials. For more details on this and The 40-page instruction the full range of Roberts radios manual is particularly detailed, contact Bronwen Andrews or and the suppliers, Waters and Stuart Newman at PR Unlim- Stanton Electronics, offer a ited, 78 Ebury Street, London backup service in the event of the SW1W 90D Tel: 071 730 7174 kit not working. All in all, it looks or your local Roberts dealer. like an ideal beginners project. The set is built in a smart metal cabinet (supplied ready drilled), ONE OF THE MOST useful items and is similar in appearance to of test equipment in any amateur the MFJ-9020 transceiver re- shack is a frequency counter, and viewed in the March issue of SAJE Electronics have recently RadCom. Price of the MFJ-8100 introduced two high-sensitivity is £71.95 inc VAT., and UK car- portable models. The SJ-40 and riage is £5.00. Further details on SJ-130 are full featured (micro- this and other MFJ products from based) battery operated counters Waters and Stanton, Tel: 0702 with frequency ranges which 206835 extend to 400MHz and 1.3GHz respectively. THE LATEST PC SOFTWARE disks of their products, to enable Reference Manual (Issue 15a) selection of ICs and discrete semi- The %bile' Dbinain and from the Public Domain and conductors for particular applica- Shareware Library Shareware Library contains a tions. A variety of these are listed Lo.r toe comprehensive selection of soft- on page 34 of their catalogue. ware for a wide variety of applica- As well as ordering by post. tions on the IBM-PC and downloading of files by modem is compatibles. also possible for those who can't There are many programs de- bear to wait for the postman to voted to amateur radio (including deliver. packet radio and antenna design), Good Quality PD as well as those for data commu- For your free 124 page cata- and Shareware nications and scientific applica- logue contact: That Works tions. The Public Domain and Soft- Also featured are files for ware Library, Winscombe printed circuit board design and House, Beacon Road,

circuit analysis. A number of Crowborough, Sussex TN61UL 1111fflik Rae Imm IL i, 1M Itt Wed manufacturers now produce data Tel: 0892 663298. Id UM KI211.In Ns ow, U2 gas

IF YOU'RE ONE OF the many unit measures 200 x 150 x 75mm, To obtain your Insect Filter (on amateurs who've acquired the requires a power supply of 13.8V, 28 days approval if required), CW bug, then you need . . . . a and is available as a kit or ready beetle on down to: Stuart G3PPD CW501 Insect Filter! This built. Listeners with computers Dobson, The Haven, Lound A liquid crystal display gives is claimed to be the 'Rolls Royce' may be interested to learn that Rd., Blundston, Lowestoft excellent eight-digit resolution, the of CWaudiofilters, and the manu- optional TTL and RS232 inter- NR32 5AT Tel: 0502 732322 for instruments are lightweight (250g) facturers say that it really is the faces are available. delivery and price information. and compact (165 x 87 x 38mm). 'bees knees' when it comes to Battery life is typically 12 hours pulling DX out of the noise. from a PP3. Sensitivity is high - Apparantly the Insect Filter has better than 10mV at 40MHz. been enthusiastically endorsed The counters are available from by leading European DX stations, Holdings Amateur Electronics and "it's so sensitive you will be (G3LLL), 45 Johnston Street, able to hear insects talking to one Blackburn BB2 1EF Tel: 0254 another". 59595. VAT inclusive prices are Besides adjustable frequency SC-40105, SC-130 £129. There and bandwidth, input and output is also a mains powered version attenuators are fitted, as well as (SC-230) at £175. UK carriage is switchable impedance matching £1.50 per order. networks for 600Q or 89. The

RADIO COMMUNICATION June 1993 35 STOCKING YOUR JUNK BOX IN ---effle sends the components and charges you ac- YOU CAN SAVE a loi of time, money and cordingly, without having to contact you for a further small payment; this usually works out frustration on your next project if you already have most of the components 'in stock'. PRACTI best for all concerned. And in all these trans- actions, you have some protection from the There's often no need to pay full catalogue . credit card company in cases of error or prices for ordinary components like small eifirB2:201SIMÉB dispute. resistors, capacitors and general-purpose If there is a pre-printed order form, always semiconductors, because you can buy them much more cheaply from surplus dealers at IAN WHITE, G3SEK use it. The form asks for all the information the company needs, so you can hardly go wrong rallies and junk sales. If you snap up the real 52 Abingdon Road, Drayton, Abingdon, if you fill it in with care. Most companies have bargains as they come along, you need only Oxon OX14 4HP — or @ GB7AVM a flat-rate carriage charge in the region of £1 - pay the higher prices to fill in the gaps. £3 for small items, and this is partly to encour- Try to build up a stock of small resistors of age you to put together an orderof worthwhile assorted values between 1051 and 100kQ. size. If there isn't a pre-printed form, that Start off your capacitor stock with 1nF, 10nF ORDERING FROM means you are dealing with a supplier whose and 100nF, of the small plate variety. These CATALOGUES primary business is with commercial compa- are always useful for RF bypassing in transis- THAT BRINGS ME to those components you nies. Many are pleased to accept credit-card for or other low-voltage circuits. Lay in a few haven't got in stock, can't find on the surplus orders from amateurs, using the facility in- small electrolytics. eg 1011F and 100 es- market and therefore need to buy from a tended for non-account commercial custom- pecially the miniature tantalum-bead types; major component supplier which does aim to ers, but do remember that you have to deal they're quite dear at full price but plentiful as stock everything you could possibly need. with them in a businesslike manner and 'speak surplus. Lower-value capacitors such as 10pF, Unless you're close to a branch in a big city, their language'. In particular, you must quote 47pF etc may be useful in VHF circuits. you usually have to deal with these forms by stock numbers and respect any minimum- For semiconductors, stock up with small- mail order. order quantities specified in the catalogue. signal diodes (1N4148 and similar), power Taking the retail companies first, the Maplin The type of letter shown in Fig 1 will gener- rectifiers (eg 1N4007), zener diodes of vari- and Cirkit catalogues are sold through high- ally 'do the business' for you. ous voltages, small-signal transistors of all street magazine shops and are also useful as sorts, a few 7805 and 7812 voltage-regulator data books. Other mail-order retail catalogues TUNING AND LOADING ICs and perhaps a few 2N3055s, the 'univer- I'd particularly recommend are Electromail sal' NPN power transistor. But do remember (the retail branch of RS Components), Bonex, PLEASE CAN YOU explain the operation of that components appear cheaply on the sur- Mainline and Electrovalue. Most of the retail the PLATE and LOAD controls on my valve plus market for a good reason, and some- companies use pre-printed order forms, and linear amplifier? Being a relative newcomer times it's because they are out-of-tolerance are very easy to deal with. to amateur radio 1 don't have a background or incorrectly marked. Before you store them Payment by credit card has many practical with valves, and the manual is too obscure to away for future use, it's always worth meas- advantages. Leaving aside the strictly finan- be of any help uring a few samples if you can. cial aspects, the main advantage over cash or A PROBLEM OF our time, indeed .... In days 'Junk' units (sold as non-working) are an cheque with order is that you don't have to of old, everyone would have known how to excellent source of components. It's hardly predict the cost to the nearest penny. The adjust these two controls, and there would worth stripping down junk units for ordinary supplier will charge the actual price, auto- have been plenty of people to set newcomers Rs and Cs, but well worthwhile for semicon- matically taking care of any variations in car- straight. But today, people who have only ductors, specialised RF components and even riage charges, or overpayments if compo- ever used no-tune rigs are acquiring second- the hardware like nuts and bolts (new price 2p nents are out of stock. If there has been a hand HF transceivers with valve PAs, or each!). For example, the cheapest way to buy minor price increase, the supplier generally valved HF linear amplifiers. The almost uni- a surplus 2N3055 is often ready- versal output circuit for HF valve mounted on a heatsink - though amplifiers is the pi-network you have to take the risk that it's Mr .1 0 Ham (Fig 2). a puddle of melted silicon inside. 73 Grid Ortve ANYTO WN The coil Li is usually tapped at Junk RF units are often over- FAnIshire several points, selected by the ANT 2/IF priced at rallies; the real bargains main band-switch to give the cor- appear in ordinary scrap-yards Component Stephen Ltd rect inductance for each band. PO Bon 88 and at radio car-boot sales. OXFORD The variable capacitor Cl near- 01(99 306 There are many surplus-com- est to the valve is typically 300pF ponent firms, and most of them date maximum and is called the TUNE appear at the big rallies, so get Dear this. or PLATE (American for 'anode') there at least once a year to re- Please wpplv the toltevreg components • capacitor, while the variable C2 stock with small Rs, Cs, semicon- nearest to the output is called Ogn Stock code Downphon Unit pnce Total ductors, LEDs, ferrite beads and LOAD, LOADING or occasion- all that kind of stuff. Some firms ally ANTENNA. offer 'bargain bags' of mixed com- Typically the loading capacitor ponents at very low prices, but it's Total price is 1000pF maximum, and both best to inspect them in person Cl and C2 may have additional Gamete, before buying. fixed capacitors switched in par- VAT o., the above The stocks of the professional allel for the lower frequencies. To dealers change rapidly because Total complete the picture (Fig 2) ,an they buy-in whatever becomes Ploatie charge card No ...... pep,,'? date and deters( to iho above gradual' RF choke RFC1 delivers the DC available, so don't expect them to supply to the valve anode(s) and have everything you need. At a Yours ranhlully, a DC-blocking capacitor, C3 car- rally, shop around: what you can't ries the RF current into the pi- find at one stand may be avail- legrinturel network. Connected across the able at another. The best surplus output is a safety choke RFC2, bargains go to those who are J O H whose purpose is to keep the best prepared and this back- output terminal and the antenna ground knowledge can be ac- at DC ground potential if C3 fails Fig 1: Sample order letter. For payment by credit card, the above details quired free by studying the com- including signature -areessential. UK suppliers will only deliver to the address short-circuit. mercial component catalogues. shown In the records of the credit-card company. The settings of Cl and C2 will

36 RADIO COMMUNICATION June 1993 IN PRACTICE interact, though Cl is usually the more critical a sharp point even the tiniest has a flat 'chisel DC supply ORSG13 and is used to resonate the circuit as a whole. edge' at the end (Fig 3a), which needs to be The setting of C2 will allow you to maximize located entirely within the centre-punched the RF output into various kinds of loads. If depression to prevent the drill from wander- C3 Ou put your antenna has a VSWR below about three ing (Fig 3b). Drill the pilot hole right through on the chosen operating frequency. you can and open it out with progressively larger sizes, often manage with the pi-network alone, elimi- once again keeping the chisel edge of the nating the need for a separate antenna tuning larger drill inside the hole and letting the two unit (ATU). main cutting edges (Fig 3a) do the work. Try this simple CW tune-up sequence, with Many problems with drilling are caused by the transmitter connected to a 50i2 dummy blunt or damaged drills. They do wear out, load that's big enough to handle the RF Tune, Loan or even on aluminium, and regrinding drill points power. Many transmitters have a time-limit on Anode or Antenna is highly-skilled work. continuous key-down time, especially until Plate control control Whatever kind of drill you're using. AL- the pi-network has been correctly adjusted Fig 2: Basic pi-network circuit. The band-switch WAYS clamp your work securely. If you're for maximum transfer out of the valves and generally selects a tap on the inductor for each using a drill press, make sure that the drill bit into the load, so check your manual and take band, and additional fixed capacitors may be is accurately located over the centre-punch care until you've got the hang of it. switched in parallel with Cl and C2 for the lower- depression or else you'll probably break some- frequency bands. 1. Select CW. plug in the key, and set the thing. For non-precision work, leave the mask- PLATE and LOAD controls to mid-way. ing tape in place to further discourage the drill Cutting edge 2. If your transmitter has a low-power TUNE from wandering. There's a lot to be said for Chisel edge position, use it; if not, reduce the output starting with a hand-drill; just lake it easy, power for the next step. concentrating on keeping the drill-bit square (a) to the workpiece. 3. Press the key and quickly adjust the PLATE control for maximum RF output (meas- When drilling is under way, don't try to push ured on a built-in meter or an external RF Cutting edge the drill through the metal or plastic - let it 'find power or VSWR meter). Release the key. its own way'. If the hole is deep, pull the drill out frequently and clear any swarf out of the 4. Switch to normal power output. Press the InRSGB spiral flutes. key and readjust PLATE for maximum RF output. Release the key. It's a critical moment when the drill breaks through the other side. It can snatch viciously 5. Press the key and adjust LOAD for maxi- (b) and may even break the drill-bit or pull a mum power output. Release the key to power drill out of your hand. That's when you give the valves a breather. Press the key learn the virtues of clamping the work se- and readjust PLATE. Release the key. Centre-punch mark curely! Try to ease off the pressure at the last 6. Repeat step 5 until you cannot obtain any moment, and let the drill drift gently through more RF output. the last small thickness. It can be very difficult This is normally the correct condition for to avoid tearing thin metal when the drill HF linear operation, with the system tuned Fig 3: (a) Close-up of a twist-drill bit, showing flat breaks through: one solution is to clamp the and loaded for maximum power output at full chisel-edge tip and the Iwo cutting edges. (b) Choose sheet rigidly between two thicker pieces of drive level. When you switch to SSB, you a pilot drill sufficiently small that its chisel edge is waste material. should then adjust the DRIVE control for the located entirely inside the centre-punch depression. These few pointers should greatly help to correct SSB drive level as detailed in the improve the quality of your drilling. Some equipment manual. In certain cases you may This allows you to draw lines and write on the aspects are a bit 'quick and dirty', and there surface without spoiling the appearance. Use be instructed to maximize the available RF are several good books to instruct you in the output at a specified anode current, or in the a sharp pencil, ruler and set-square to mark finer points of precision marking-out and drill- where the holes are to be drilled, working case of 4CX250Bs to adjust the LOAD control ing [2]. If all else fails, you'll have to develop for the correct value of screen-grid current [1]. from two edges that are at right-angles. Write the art of 'hole-shifting' - it's amazing what With a little practice you'll be able to tune the diameters of the holes near where your mistakes can be rescued with the help of a marking-out lines cross. Some components and load your transmitter very quickly, espe- thin round file! cially if you make a note of the correct settings require several mounting holes, and it's often for each band. When you connect an antenna possible to mark one hole and then use the of nominal 50ohm impedance, you'll have to component itself as a template for marking UNTIL NEXT MONTH... repeat the procedure to tune and load the the others. It's generally more important that IF YOU HAVE any comments on this month's amplifier into whatever impedance the an- the holes are accurately positioned relative to column, or any new questions, I'd be very tenna is actually presenting. If you use an one another, than it is to locate the whole pleased to hear from you by mail or by packet ATU, don't touch the transmitter after setting component accurately. For marking holes on (see head of column). But please remember it up with the 50ohm dummy load; instead, a Olin grid, tape down a piece of Veroboard what I said in the first In Practice column (April adjust the ATU with the aid of a VSWR meter and mark through the holes. RadCom): I can only answer questions so that the antenna looks to the transmitter The next step is to centre-punch the holes. through this column, and they have to be on like a 50ohm load. This will locate the point of the drill-bit in the topics of general interest. Sorry, but regret- vital initial stages of drilling. Without this mark fully I cannot give individual advice. The fea- the point will wander and bite in at the wrong DRILLING HOLES ture on books will be held over until next place, or else the drill will bend or break. I month. WHENEVER 1 TRY to drill a box or a panel, it prefer a small, sharp centre-punch which can ends up looking a mess. How should 1 do it be accurately located and given a gentle tap right?' with a light hammer. If a deeper mark is REFERENCES WE'RE NOT TALKING about precision engi- needed, this can follow afterwards. [1] Transmitters, power amplifiers and EMC. neering here, just ordinary DIY drilling of Obviously a vertical drill-press is best for The VHF/UHF DX Book, DIR Publishing boxes and panels in soft materials like alu- the drilling itself. Second in order of prefer- Ltd, ISBN 0-9520468-0-6. ence comes a hand-drill, and last of all a minium or plastic. The process divides into [2] The Amateur's Workshop. Ian Bradley, three equally important sections: marking. hand-held power drill because it's too easy to Argus Books, ISBN 0-85242-482-5. out, centre-punching, and the drilling itself. make expensive and dangerous mistakes. A good way to mark where you're going to For holes larger than 3-4mm you should [3) UK Cal/book 1993, RSGB. drill holes is to cover the relevant sections of probably use a pilot drill, typically 2-3mm [4] The ARRL Handbook, obtainable from the workpiece with masking tape (DIY stores). diameter. Any normal twist drill does not have RSGB (see page 94).

RADIO COMMUNICATION June 1993 37 F1890/AT

FT990 F1990/DC

7 e Wet. FT1000

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TM732E FT5100 IC3230 TM741E Yet again all four of these mobiles are packed with features from 2m, 70cm, 6m in one rig, remote head facility, wideband receive, dual receive, auto repeater, AM facility. It just goes on and on.

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38 RADIO COMMUNICATION June 1993 THE LMF100 CONSISTS OF two independ- LSh (9) ent general purpose high performance This is the level shift pin. With dual +/-5V switched capacitor filters. With an external supplies and CMOS (+1-5V) or TTL (0V-5V) clock and two to four resistors, various sec- clock levels, LSh should be tied to the system ond order and first order filtering functions ground. For 0V-10V single supply operation can be realized by each filter block. Each the AGND pin should be biased at +5V and block has three outputs. One output can be the LSh pin should be tied to the system configured to perform either an all-pass, high- ground for TTL clock levels. LSh should be pass or notch function. The other two outputs biased at +5V for +/-5V CMOS clock levels. perform band-pass and low-pass functions. National LMF1D0— This month's IC is For single 5V operation the LSh and Vo+ pins The centre frequency of each filter stage is a Dual Switched Capacitor Filter are tied to system ground for TTL clock levels. tuned by using an external clock or a combi- offering high performance and nation of a clock and resistor ratio. Up to a versatility. Q factor, bandwidth and fourth-order biquadratic function can be real- CLK (10,11) ized with a single LMF100. passband gain are selectable with Clock inputs for the two switched capacitor Higher order filters are implemented by external resistors, and a TTL or CMOS filter sections. Unipolar or bipolar clock levels simply cascading additional packages. and compatible clock at 50 or 100 times the may be applied to the CLK inputs according to all the classical filters (such as Butterworth, centre frequency sets the frequency the programming voltage applied to the LSh Bessel, Elliptic, and Chebychev) can be real- pin. The duty cycle of the clock should be ized. The National LMF100 is pin compatible response. DIL versions are the close to 50%, especially when clock frequen- with the industry standard MF10, but pro- LMF100ACN, LMF100CCN and cies above 200kHz are used. vides greatly improved performance. LMF100CIN which have similar levels of performance in most applications. A FEATURES 24 page file of design data for 50/100 (12) • Wide 4V to 15V power supply range applications using this chip is available By tying this pin to V+ a 50:1 clock to filter • Operation up to 100kHz centre frequency ratio is obtained. Tying this from National Semiconductor. • Low offset voltage pin to mid-supply or to V- allows the filter to typically V.s, +/- 5mV operate at a 100:1 clock to centre frequency Vc„.2,Vos3 = +/-15mV ratio. • Low crosstalk -60dB • Clock to centre frequency ratio 1pF. The pin should accuracy = +/- 0.2% typical be driven with a • fox Orange up to 1.8MHz source impedance of VD+ VA+ N iA PT hi PA 514 EPA LPA • Pin compatible with MF10 less than 1ki2. If S1 is 5 02 not driven with a sig- nal it should be tied to AGND. VA LP4 L PB

BP4 BPB SA,, (6) N/AP/HP4 NI/AP/HP[3 This pin activates a is AGND o LJ- [ NV4 INVB switch that connects Nonover one of the inputs of CL St SIB clock each filter's second S4/8 AGND summer either to 12 f•à, VA+ vA - AGND (SAE lied to V-) sonoo D Control 9 VD+ V 0- or to the low-pass (LP) L5n D output (S, tied to LSh 50/100 Level Non over V+). This offers the CLKB CLK4 CLKB sh clock flexibility needed for To configuring the filter AGND o in its various modes Fig 1: LMF100 In 20 pin DIL package. of operation.

INVB PIN DESCRIPTIONS VA+ (7) Lp (1,20), BP (2,19), N/AP/HP (3,18) This is both the ana- logue and digital posi- The second order low-pass, band-pass and 13 Jl D ie tive supply. notch/all-pass/high-pass outputs. These out- VD— VA— N/APJHPB S B puts can typically swing to within 1V of each VD+ (8) supply when driving a 5k.Uload. For optimum This pin needs to be performance, capacitive loading on these outputs should be minimized. For signal fre- tied to V+ except Fig 2: Internal configuration diagram. when the device is to quencies above 15kHz the capacitance load- operate on a single 5V supply and a TTL level AGND (15) ing should be kept below 30pF. clock is applied. For 5V. TTL operation, Vo+ This is the analog ground pin. This pin should should be tied to ground (OV). INV (4,17) be connected to the system ground for dual supply operation or biased to mid-supply for The inverting input of the summing op-amp of single supply operation. For optimum filter each filter. These are high impedance inputs. VA- (14),VD- (13) performance, a 'clean' ground must be pro- The non-inverting input is internally tied to Analogue and digital negative supplies. V,- vided. AGND (mid-supply) so the op-amp can be and V,- should be derived from the same used only as an inverting amplifier. source. They have been brought out sepa- rately so they can be bypassed by separate TYPICAL OPERATION S1 (5,16) capacitors, if desired. They can also be tied The LMF100 has six major modes of opera- Si is a signal input pin used in certain modes together externally and bypassed with a sin- tion. Mode 3a (see Fig 3) is typical, and of operation. The input impedance is 1/f x gle capacitor. values are calculated as follows:

RADIO COMMUNICATION June 1993 39 SIMPLY SILICON

NOTE: Device characteristics and application notes in Simply Silicon are compiled from manufacturers published data. Circuit diagrams are included for yin experimental purposes only, and have not been proven by Radio Communication. Transmitting equipment must be operated in accordance with national regulations. All data is copyright of the device manufacturer.

Notch Out RSGB National Fig 3: The LMF100 in mode 3a has HP, LP, BP and notch outputs, as shown above. Mobile Rally ,VR2 foLK Centre frequency = Notch frequency X 1- Sunday 18 July 1993 1714 100 VR Open 10am

R2 Woburn Abbey, Bedfordshire Or = -Ç-Q` x 50 F4 or + Large Trade Exhibition 50 • RSGB Bookstall and Enquiries R2 R3 + Members' Mart x R2 Gain of notch at fe, + All Under Cover The RSGB makes no charge for entrance to the i R R rally, but all visitors must pay for entrance to _ R2 Woburn Park in which the rally takes place, at £5 Highpass gain - HoHp = HOLP HOHP per vehicle including passengers. £2.50 single R1 occupants. All normal Wobum attractions are Q ( available al a small extra cost. R3 Bandpass gain = Hoop = - — R1 The integrated circuit is available from RSGB, Lambda House, National Semiconductor distributors or in the Cranborne Road, Potters Bar, R4 LMF100CIN version from Electromail (RS). Lowpass gain = Herts. EN6 3JE R1 Tel: 0536 204555.

B INTERNATIONAL HF CONVENTION /tS /lee Co k

Friday 8 - Saturday 9 - Sunday 10 - October 1993

EAR LY INF O R M A TIO N

•Location: The Beaumont Conference Centre, located • The 1993 International HF Convention is organised a few minutes drive from the M25 and Heathrow by the HF Committee of the RSGB in association with Airport. Nearby Windsor with its famous castle and the HF Contest & IOTA Committees, and the Chiltern shopping facilities is a must. DX Club

• Programme: An extensive programme of talks on • Overseas visitors reception topics such as DX-peditions, Equipment, IOTA, DX- • Saturday evening DX dinner Clusters, EMC, HF DX-ing, Antennas & Contesting. • Invited Traders and Special Groups • The latest amateur radio software • For the full convention prospectus including an • Ladies programme advance booking form, please send an SASE to — RSGB HF Committee, PO Box 599, Hemel Hempstead, • Young Amateur of the Year award Herts HP3 OSA, UK.

Radio Society of Great Britain Lambda House, Cranborne Road, Potters Bar, Herts. EN6 3JE

40 RADIO COMMUNICATION June 1993 R Calibrator Marker Unit

by Ian Keyser, G3R00

HE IDEA FOR THIS calibrator was C FISGB born when David, GM4ZNX, and I CIS PIS were working on our new trans- CC" P2' P10,, 15, 467

ceiver project called 'The Dooms- CR 1.1 P4e•J Se w. o. IMOp day Box', the name of which is 'CG Inn& :6:C5 U PC «. Tmore indicative of the completion date than 11.0 • anything else! We needed a comb generator '.0 with a flat frequency response over the HF 109 `7Vdsi, spectrum. The results were so satisfying that 10 I) we thought that it could make an excellent ICS

7ttfg " crystal calibrator and an excellent Novice 4711 22. .R! project. Fig 1 shows the circuit, and all com- K U) 1 17727 ponents are readily obtainable. A suitable C'S r;7 IC layout is shown in Fig 2. 7 1214 '0 R2 IC ,C7 •C: 74•C00 FINER FEATURES AS USUAL WE STARTED looking at the drawbacks of calibrators, and although the C. initial design overcame the problem of poor 9 Ti..C1)9 '80. lic 13 frequency response, it still suffered from the • M1111 100. IR 106 ID° 'OC,' e inability to know where you are tuned within •06 619 CR g2RO the frequency spectrum. In a conventional 0°R 16 6 !up marker it is easy to turn on the MHz markers DI IO 1.2.C390 first, and then turn on the 100kHz marks and TR, - BC:I3 LJP 145.17 7 9 :1 = count. However, if you mis-count you have to ZÇC7 turn off the 100kHz markers and start again from the 1MHz position. It would be a lot /717 easier if the 1MHz and 100kHz markers could be tagged differently so that they are easily Fig 1: The 10kHz enable input is active-low and should be pulled up to +SV when not used. identified. This is not as difficult as it first appears and, with some thought, it would be 10kHz outputs. 1kHz is far too fine to worry ration pulses on the positive going edge of the possible to make tagging very specific in- about and so was ignored. square wave from the divider chain. These deed. A 10MHz crystal and two 74HC390 pulses have nanosecond duration time and chips can generate a square wave down to so are very rich in harmonics. Advanced- COMB GENERATOR lkHz and high speed gates would give very CMOS quad NAND gates are used, which effective combs from the 1MHz, 100kHz and THIS CIRCUIT GENERATES very short du- switch at very high speed. Three identical circuits are used to generate very short dura- tion negative going pulses at pin 8 of each NAND gate. Pin 5 of IC6, IC5 and IC7 receive signals from the counter chain at 1MHz, 100kHz and 10kHz respectively.

TAGGING THE MARKERS AS DISCUSSED EARLIER, provision has been made to turn off the comb outputs by logic signals and as I decided that having the 10kHz tone on all the time would be confusing an 'Enable 10kHz.. input was included on the edge of the board so that it could be turned on or off as required. This left the 1MHz signal and the 100kHz for tagging. A rummage through the available logic ICs in the drawer revealed a 74HC4040, a 12 bit counter and a 74HC139, a 2 to 4 line decoder. Thus was decided the method of tagging. Outputs Q7 and 08 of the 74HC4040 are used to give square waves at about 7 and Fig 2: The calibrator uses readily obtainable and inexpensive components. 3.5Hz. When these are decoded they gener-

RADIO COMMUNICATION June 1993 41 A CALIBRATOR MARKER UNIT

ON YOUR MARKS WHEN TUNING THROUGH the COMPONENTS LIST :IF.C.401P Pon band without the 10kHz markers Capacitors enabled, a signal at each 100kHz Cl 47it F 25V position will be heard going "dit— Ztaltete C2 43 16V dit—dit- " Having arrived at a C3 47p MHz position a rapid string of dits C4,C5 68p ("dit dit dit dit . . ..") will be heard. C6,C7,C8 10n When the 10kHz marker is ena- C9,C10,C11 100n bled a continous unmodulated tone C12,C13 100n is heard every 10kHz up the dial, but C14,C15,C16 lOn at each 100kHz position a slow string C17.018 10n of dits is heard modulating the tone. At the 1MHz position the rapid string TC1 3-30pF pre-set of dits will be heard as modulation. The amplitude of the 10kHz marker Resistors 5% 0.25W is kept lower than the other two R1 22k markers to make the modulation R2 10k easily recognisable. new. ,.. R3,R10 220R My spectrum analyser shows that R4,R5 470R the comb output is flat to within 3dB 111.," ..e.Ken•t• R6 100k up to 70MHz and is only 6dB down R7 18OR at 2 meters. Listening on my FT290 R8 2k2 transceiver proved that the marker Output nave at •I R9,R13,R14 1R0 signals are adequate for use on this Ittt. fteurorut• R11,R12 220R band. On 70cm they are 10dB down, R15 4k7 Ctutput hard at •I but no gear is available to do an R16 100R INertz lurson.c• audible check. Finally, the PCB lay- R17,R18 1R0 out shown in Figs 4 and 5 gives a R19,R21 1R0 clean, stable output. Fig 3: Output waveforms aregated using the 74HC139 decoder. R20 47R R22,R23 1R0 R24,R25 1R0

RV1 1k0 o o

Semiconductors o o IC1,1C2 74HC390 IC3 74HC4040 IC4 74HC139 1C5,1C6,IC7 74ACOO IC8 78L05

TR1.TR2 BC183 D1,D2 BAR28 or similar Schottky diodes 4:) m / o O Additional items OV O Q o ?6 0 0 o 0 10MHz crystal o PCB or prototype board. ktr%>071.\- 0,841-t A kit of parts for this project is available o Mar er Co!Col G3R00 16,12,92 o o o from Kanga Products, Seaview House, Crete Road East, Folkestone, Kent Fig 4: Track side of the printed circuit board. CT18 7EG. Tel: 0303 891106.

Out. pu t o 0 ate a nice 'dit' speed. These two outputs are o o° fed into the two input pins of the decoder and O 0 0 0 the four outputs will go low (logic 0) in se- O o 0 0 0 0 0 0 O 0 o 0 0 0 0 0 0 0 0 0 0 0 quence with a mark to space ratio of 3:1. This O 0 0 0 0 0 0 0 0 0 0 0 0 can be seen in Fig 3. The 74HC139 outputs O 0 O 0 0 0 0 0 0 00 0 00 0 0 '0' and '2' are used to gate the 100kHz and O 0 o 0 0 0 0 0 0 0 0 0 0 0 O 0 o 0 0 0 0 0 0 0 0 1MHz at different times. Thus when tuning on O o O o o o 0 CI 0 0 o a receiver at the 100kHz interval we will hear O O D 0 0 0 D 0 0 0 0 0 a a dit followed by a time interval of three dits n and then another dit and so on. o o 8 8 0 á 8 8 8 1131< When we tune to the MHz position on the o receiver we will still hear the 100kHz signal, o o o o o o o o but also the pulsed output from the 1MHz 00 0000 o 0 0 0 comb. This output will occur on the middle o O o 8 o o o space of the three spaces of the 100kHz lip ot comb and so we will hear dit, one space, w o o DO ° ▪ 0 0 000 0 00 00 dit, one space etc .... The 1k preset is added O Merkur Cul G3R00 16,12,92 so that the levels of the two signals can be balanced. Fig 5: Component side of PCB. Note the 10kHz enable Input.

42 RADIO COMMUNICATION June 1993 Now 50% Bigger for the Same Price!

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D-i-Y Radio (Dept RC6) Radio Society of Great Britain, Lambda House, Cranborne Road, 4)Potters Bar, Herts EN6 3JE

RADIO COMMUNICATION June 1993 43 RSGB Annual Meeting 1992 Informal Session

HE PRESIDENT opened ager appeared to be performing the informal session by satisfactorily, was it necessary to announcing the presen- appoint a new one? T I Ttation of the following Lundegard, G3GJW (Chairman awards: Finance and Staff Committee), The Founders Trophy to R explained that whilst Mr Kirby's Western, G3SXW predecessor had an undoubted talent for financial matters the The Ostermeyer Trophy to M Society had to remain dynamic Grierson, G3TS0 and the skills needed in a Head- The Courtney-Price Trophy to quarters General Manager had L Moxon, G6XN changed. The Warwick initiative The Pilot Officer Norman Keith had shown that administrative Adams Prize to G Billington, ability was necessary to carry the G3EAE Society forward and the new manager was felt to be eminently The Wortley-Talbot Trophy to suitable in this respect. The pre- R Rylet, G3VXJ vious General Manager's contract R J Hughes, G3GVV, then pre- had run its course and a decision sented the Society with a medal- had been taken to replace him. lion from the Brazilian Amateur W J Kennedy. G3MCX then Radio Society for the work in sup- expressed thanks for the Society port of amateur radio performed taking action on his point about by RadCom magazine. the lack of information on parking The President went on to facilities at the Annual General present the Society's Certificate Meeting. of Merit to J P Hawker, G3VA, for M Shardlow, G3SZJ, then his outstanding service to ama- raised the question of confirma- teur radio. tion of elected Council Members A message of support from the who had reached, or would reach Bulgarian Federation of Radio during their term of office, the age Amateurs was then read out. of 70 years. He said that the Agenda had been altered from President's that used in previous years. The Some of the magnificent trophies presented each year at the Annual Meeting. Company Secretary said he was Speech responsible for the wording of the GAM1, would be operational be- Vice President for his support PRESIDENT TERRY BARNES, Agenda and he would clarify the fore very much longer due en- and paid tribute to the Headquar- GI3USS, then spoke of the re- position. [Company Secretary's tirely to the efforts of a dedicated ters staff, volunteer officers of the markable turn round in the Soci- note: Subsequent legal advice band of volunteers. Society and most of the member- ety's financial position but warned indicates that the requirement to ship for their loyal support during that it was no time to be compla- The Society was held in high confirm the appointment of such his term of office. cent. The economic recession esteem internationally and he elected members of council is no was still biting into the amount of personally hoped that the Radio longer necessary - the require- money members had available Society of Great Britain would Questions ment having been abolished for the purchase of books, and continue to be represented at DECLARING THE attendance at some 13 years ago. It will not traders were also bound to re- gatherings and conferences over- the Annual General Meeting as appear on future Agendas]. strict the amount expended on seas. 100, the President invited ques- J R Harris, G4DRV, then asked advertising. He called for in- Turning to subject of the An- tions: about the position regarding creased efforts to recruit new nual Report he said that it had H LW Bellfield, G3SBV, asked RAYNET and C N Trotman, members. been presented in a new format about the result of the request for GW4YKL (Acting Emergency He then spoke of the strategy this year which he hoped was members views on Third Party Communications Officer), an- conference held in July to plan appreciated by members. The Traffic. J Bazley. G3HCT (Chair- swered by saying that the situa- the future three years. Whilst election ballot papers had been man Licensing Advisory Commit- tion was still somewhat confused, many of the proposals had al- included with the Annual Report tee), responded by saying he had mainly because RAYNET groups ready been implemented a and Accounts, together with a received some very positive had traditionally worked on their number required further discus- reply paid envelope. However, views. As a result he considered own in small autonomous cells. sion before putting into place. despite these improvements very that the Licensing Advisory Com- The newly formed RAEN had now Moving on to the Novice Li- few members took the trouble to mittee had a mandate to approach been registered asa limited com- cence, he expressed the hope exercise their franchise. It was the Radiocommunications pany with the prospect of charita- that many recipients would go on difficult to see what more the Agency for an extension of the ble status. However, natal' groups to achieve full licence status and Society could do to encourage Greetings Message facility and wished to be part of that particu- membership of the Society. members to vote. he was expecting a decision soon. lar organisation; it was for that He said he hoped that the So- The President then thanked P H Kay, GOFAB, asked why, reason that an Emergency Com- lar Data Broadcast Station, E Chadwick, G3RZP, Executive when the previous General Man- munications Officer had been

44 RADIO COMMUNICATION June 1993 RSGB ANNUAL MEETING 1992

lems. However, thanks to several of Further Education were be- generous donations of parts and coming more and more reluctant labour the project was scheduled to run Amateur Radio Examina- to go live early in 1993 from a site tion Courses and this caused in Bedfordshire. J Smith, G3HJF, immense problems for those or- asked why the transmitter fre- ganising them. quency was situated outside the G R Foster, G1DRG com- amateur band when it was es- plained about the lack of informa- sentially a service to amateurs tion percolating down to RLOs. C and was told that there were very N Trotman, GW4YKL, answered good reasons for that decision, as Chairman of Membership Liai- the most important of which was son Committee by saying that to keep the facility free from ORM. they should generate a great deal J D Ray, G8DZH, then asked of information themselves al- whether the Society was aware though there were plans to circu- of any proposals to reduce fre- late a newsletter to each RLO in quency allocations on 70, 23 or the near future. The General 13cm. J N Gannaway, G3YGF Manager said he felt some sym- (Vice-Chairman of the Licensing pathy for the position the RLOs Advisory Committee) said he was found themselves in but said that aware of the rumours but as far Ihe Society hoped to appoint a as he was concerned there was Public Relations Officer in the no foundation for them. near future and keeping RLOs M P Williams, G4GRS, re- well informed about Society mat- At your service: Justine Hodges (left) and Fiorina Sinapi. quested clarification on the posi- ters would be a responsibility of tion of a repeater for which he the post holder. appointed by the Society. Until a members would like to attend and was the keeper. Another repeater The President then drew at- number of points had been clari- observe then he felt sure Council had been allocated the same fre- tention to the arrangements for fied it would be unwise for the would give it consideration. quency and, despite letters to the the installation of the 59th Presi- Society to issue any statement. T VVinchcombe, G6ZH, asked Society and its Repeater Man- dent of the Society, scheduled to N A Bedford, G4NJP, asked, in about the administrative expense agement Group (RMG), he had take place on 9 January 1993. view of the Princess of Wales involved in processing applica- not received a satisfactory an- L J Smith, G3HJF, asked tapes exposé, whether the Soci- tions for special event stations. swer. G W Dover, G4AFJ, Chair- whether RadCom readers could ety monitored press reports and The General Manager confirmed man of the RMG replied that he expect more contest coverage in responded accordingly. The Gen- that no charge was levied for this was fully aware of the problem the magazine and the Managing eral Manager replied by saying service and J Bazley, G3HCT, and had previously discussed it Editor of RadCom, M Dennison. that he had only been with the reiterated the fact that as it was a with questioner. The problem was G3XDV, replied that this was an Society for about fourweeks when variation to the licence only the complex and he had asked the old chestnut and a survey of read- the initial scanner publicity ap- Secretary of State could levy a appropriate RMG Zonal Repre- ers had revealed that they did not peared in the national press. De- charge as part of the licence fee. sentative to contact Mr Williams want more contest news. The spite having no public relations However, the Society did receive and try to agree a solution. magazine staff was fully aware of machine at his disposal, the So- a contribution from the RA for the J S Linfoot, GOCPP, asked why this minority interest and tried to ciety had responding by issuing a administrative costs involved in the Society did not put as much allocate appropriate space. How- full press statement together with issuing such licences. He also effort into assisting amateurs ob- ever, a compromise might be to a letter of explanation lo every pointed out some of the condi- tain full Class A and B licences as offer the full details to interested national newspaper editor. De- tions under which some licences it did with the Novice Licence. E J members by way of an informa- spite detailed explanation given were issued. Case, GW4H WR (Chairman tion sheet supplied on request to some newspapers they per- J S Linfoot, GOCCP, asked Training and Education Commit- and on receipt of a stamped en- sisted in printing misleading arti- why, if the contribution did not tee). replied that the Society velope. The other point worth cles on the subject of amateur cover the total cost, did the RSGB showed people how to get a li- making was that RadCom could radio and there was little else the continue to perform the task and cence but the onus for doing so not publish information it did not Society could do once that atti- J Bazley, G3HCT, said that it was was with the applicant. The cor- receive and members who sub- tude prevailed. part of the service to members. nerstone of the amateur service mitted information for publication L J Smith, G3HJF, asked why P B Higgs, GW4IGF asked was self motivation and training. should understand the printing he could not obtain minutes of what the current membership of The Society could point the way lead time for the magazine was Council Meetings and why he was the Society was and the Presi- but that was all. weeks before it actually appeared. not allowed to attend in person as dent replied that it was 31,749 A member of the Training and Early submission of copy made it an observer if he so wished. The which was down from last year's Education Committee PW Mayer, more likely that the material would Company Secretary replied that figure and that was a matter for GOKKL, remarked that Colleges appear. the minutes of Council, once con- some concern although the rate firmed. were available to any of decline in numbers had slowed member on application to Head- down recently. quarters and had been for some C Redwood, G6MXL, asked time. A notice to the effect had about code-free licences and J appeared in RadCom. As to at- Bazley, G3HCT, replied that the tending he (the Company Secre- HF Committee were seeking tary) said he could see no diffi- views of members and others on culty other than accommodation, that matter. The issue was com- adding that his experience in pub- plicated but the Society wanted lic office had shown that few mem- to have as many opinions on the bers of the public attended meet- matter before making represen- ings despite having the right to do tations to the RA. so; the open invitation to mem- Al this point G Williams, bers to attend the Warwick dis- G4FKH, briefed the meeting on cussions had received a disap- the GAM1 project which had suf- pointing response. However, if fered a number of set-backs due there was a general feeling that to equipment and software prob- Alan Betts. GOHIG, takes the microphone during the informal session.

RADIO COMMUNICATION June 1993 45 A Review of the Society's . . . Memorandum and Articles of Association

by Nigel Roberts G4IJF, Secretary, M&A Review Working Group

sented to Council on March 12th dum and Articles do not mention The other changes are fairly HORTLY AFTER the Warwick Strategy and was approved. amateur radio! There is a very minor and are an attempt to make Conference. RSGB The revised document is re- simple explanation. When our the Memorandum more properly Council set up a work- produced here, along with a brief Society was incorporated in 1926, reflect the work of the Society ing group to review the commentary. The proposed amateur radio as such did not and the modern world. Para- Society'sS formal constitution - the changes are shown in bold and exist; the RSGB was a collection graphs 3.(b)(9) - 3.(b)(11) (which Memorandum and Articles of are marked by change-bars. of people interested in what was are new) simply document what Association (M&A). The group This revised Memorandum has - at the time - a new and develop- the Society does already. consists of Council Members also been vetted by the Society's ing area of technology who Since the British Empire Hilary Claytonsmith, G4JKS; legal advisers and it is now in- wanted to set up a learned soci- passed into history nearly half a Nigel Roberts, G4IJF and Neil tended that it will be presented to ety to promote research and de- century ago, we thought we the Lasher, G6HIU (Chairman). the membership for ratification velopment of 'radio science'. reference to "Colonial & Foreign" Over the last few years, occa- by Special Resolution at an EGM Distinctions between profes- [3(b)(8)] should be brought up-to- sional technical problems have to be held on the same date as sionals and amateurs in the radio date - even though technically arisen from time to time with the the AGM in December. This field came later - in the beginning the United Kingdom still does M&A. The Society was founded should give you plenty of time to all radio people were 'amateurs'! have a few colonies. in 1913 and was incorporated as consider it before then. The absence of a reference to The substitution of 'one pound' forone guinea' simply recognises a company limited by guarantee A lot of thought has gone in amateur radio in the Memoran- dum was identified by the War- the disappearance of the guinea thirteen years later. However the preparing the proposed changes wick Conference and the working as a commonly understood unit Articles have not always been to the Memorandum, and your of currency (it is actually equal to updated to reflect changes in the comments are invited at this early group felt this was an important change which could be imple- £1.05). work of the Society overthe years. stage. Note: Information on pro- The inclusion of a standard There have been some changes posed changes to the Articles will mented very easily. general clause [3(f)], normal with from time to time, but usually in appear in a subsequent issue of You will note that the phrase modern companies, is an attempt reaction to perceived problems Radio Communication. Amateur Service is used in the whenever they arose. This is a revised Memorandum. There is a to 'future proof' the Society's con- very expensive way of doing specific reason for choosing this stitution. things, since each minor change The wording. Amateur Service is the It is not a trivial matterto change to the Articles requires an Ex- Memorandum term used by the International the Memorandum of a Company. traordinary General Meeting of Telecommunications Union (ITU) It is the Memorandum which - the Society, necessitating ex- AS THE RSGB IS a company in Radio Regulations (the inter- more than any other document - penditure on legal advice on each with limited liability under the national rules which most UN defines the company's 'soul'. We occasion. Companies Acts, it is required to member countries have agreed believe that the changes we are Until now, there has been no have both a memorandum and a will govern the use of radio proposing (which still have to be comprehensive review of ourcon- set of articles. No doubt many throughout the world). It is where agreed by the Membership in stitution in the light of today's members will ask 'Exactly what you will find definitions of the December) fulfil our aim of pro- RSGB - which has changed in are these?' Broadly speaking, a Amateur Service and the Ama- viding for the future of the Society many ways since it was formed Memorandum is a statement of a teur Satellite Service next to all while remaining true to the spirit as the Incorporated Radio Soci- company's aims and objectives the other services (Broadcast of the past. ety of Great Britain of the late while its Articles relate to how the Service. Fixed Service, Aeronau- If you have any comments on 1920s. company is set up in order to tical Mobile Service and so on). It the Memorandum, or indeed on The goals of our review are to achieve the aims contained in the is on the basis of these definitions any other aspect of the society's provide the RSGB with a consti- Memorandum. that frequency allocations are constitution, we welcome your tution which: Strange though it might seem made at ITU World Administra- comments. Please write to us c/o • accurately reflects the work of to most members, our Memoran- tive Radio Conferences. RSGB Headquarters. our Society, • is responsive to the needs of the Society for the foresee- able future, • corrects existing anomalies, • is in understandable English, • keeps changes to the mini- mum required to fulfil the above goals while keeping the spirit (and in most cases, the letter) of the original M&A, ie no 'change for change's sake'. This work has been taking place since the Warwick Confer- ence, and the first result of this is a proposal for a revision of the Three of the original signatories of the 1926 RSGB Memorandum of Association: (I to r) Brigadier-General Sir Capel Memorandum. This was pre- Holden; Henry Bevan Swift. G2TI; and Gerald Marcuse. G2NM.

46 RADIO COMMUNICATION June 1993 ME MBERSHIP CONSULTATION

The Companies Acts 1908 any additional library of Society or its members or any fore the time at which he ceases to to 1917 books, works, manu- section thereof; be a member, and of the costs, Company Limited by scripts on Radio Com- (f) The doing all such other law- charges and expenses of winding Guarantee and not having a munication or the appli- ful things as the Society may up the same, and for the adjust- share capital cation thereof or other think fit. ment of the rights of the contribu- subjects allied thereto; tories amongst themselves, such Provided that the Society shall not Memorandum of amount as may be required not (5) To borrow or raise money support with its funds any object exceeding one pound. Association of as the Society may think or endeavour to impose on or pro- If upon the winding up or dissolu- Radio Society of fit: cure to be observed by its mem- 7. (6) To make grants of bers or others any regulation, re- tion of the Society there remains, Great Britain after the satisfaction of all its debts money, books, medals. striction or condition which if an (name of company altered from "The apparatus or otherwise object of the Society would make and liabilities, any property what- Incorporated Radio Society of Great for the purpose of pro- it a Trade Union. soever, the same shall not be paid Britain" by Special Resolution dated to or distributed among the mem- moting invention and re- Provided also that in case the the 18th day of December 1953) bers of the Society, but shall be search in Radio Com- Society shall take or hold any prop- 1. The name of the Company (here- given or transferred to some other munication or its appli• erty subject to the jurisdiction of inafter called "The Society") is institution or institutions, having cations or in subjects the Charity Commissioners for "RADIO SOCIETY OF GREAT objects sim ilar to the objects of the connected therewith; England and Wales or Board of BRITAIN". Society, and which shall prohibit (7) To form Sections of its Education, the Society shall not the distribution of its or their in- 2. The registered office of the Soci- members united in pur- sell, mortgage, charge or lease come and property amongst its or ety will be situate in England. suit of some common in- the same without such authority, their members loan extent at least 3. The objects for which the Society terest approval or consent as may be as great as is imposed on the is established are:- required by law, and as regards (8) To affiliate with itself Society under or byvirlue of Clause any such property the Managers (a) To succeed to and take over British, European and 4 hereof, such institution or institu- such of the property, rights or Trustees of the Society shall be any other societies tions to be determined by the and obligations of the existing chargeable for such property as world-wide interested members of the Society at or be- may come into their hands, and Radio Society of Great Britain in Radio Communica- fore the time of dissolution, or in as may lawfully be acquired shall be answerable and account- tion or other subjects default thereof by such Judge of able for their own acts. receipts, and taken over by the Society. allied thereto; the High Court of Justice as may neglects, and defaults, and for the (b) To promote the general ad- (9) To purchase for the have or acquire jurisdiction in the due administration of such prop- vancement of the science and purpose of resale com- matter, and if and so far as effect erty in the same manner and to the practice of Radio Communi- ponents, papers, cannot be given to the aforesaid same extent as they would as cation or other subjects al- books, apparatus and provision then to some charitable such Managers or Trustees have lied thereto and lo lacilitate other items relating to object. the exchange of information been if no incorporation had been radio communication 8. True accounts shall be kept of the and ideas on those subjects effected, and the incorporation of and subjects allied sums of money received and ex- among its members and to the Society shall not diminish or thereto; pended by the Society, and the obtain the maximum liberty of impair any control or authority ex- (10) To act under agree- matters in respect of which re- action consistent with safe- ercisable by the Chancery Divi- ment on behalf of gov- ceipts and expenditure take place. guarding the interests of all sion, the Charity Commissioners ernment agencies for and of the property, credits, and concerned, and for this pur- or the Board of Education over the purpose of issuing liabilities of the Society; and, sub- pose:- such Managers or Trustees, but licences and variations ject to any reasonable restrictions they shall, as regards any such (1) To hold Meetings of the thereto; as to the time and manner of in- property, be subject jointly and Society for reading and specting the same that may be (11) To develop and con- separately to such control or au- discussing communica- imposed in accordance with the duct examinations for thority as if the Society were not tions bearing upon Ra- regulations of the Society for the the purpose of the f ur- incorporated. In case the Society dio Science or the appli- time being, shall be open to the therance of knowledge shall take or hold any such prop- cation thereof or upon inspection of the members. Once in the Amateur Serv- erty which may be subject to any subjects relating thereto; at least in every year the accounts ice; trusts, the Society shall only deal (2) To hold, promote or sup- of the Society shall be examined, (c) To purchase, take on lease, or with the same in such manner as port Exhibitions of instru- and the correctness of the bal- other-wise acquire, and also allowed by law having regard to ments, apparatus or ance-sheet ascertained by one or let, lease, or to dispose of any such trusts. other appliances con- more properly qualified Auditor or premises or other property for 4. The income and property of the nected with the Amateur Auditors. the purposes of the Society. Society shall be applied exclu- Service, Radio Science We, the several persons whose subject to the provisions of sively in the promotion of the fore- or its applications; names and addresses are sub- Section 19 of the Companies going objects, and no dividend (3) To print, publish, sell, scribed, are desirous of being (Consolidation) Act, 1908; shall be paid to its members or any lend or distribute the pro- formed into a Company in pursu- (d) Subject to the rules of law af- of them; but these restrictions shall ceedings or reports of ance of this Memorandum of As- fecting champerty and main- not prevent the payment to any the Society or any pa- sociation H.C.L. HOLDEN. Brig.- member (including any member pers, communications, tenance to raise and adminis- Gen., 2 St. John's Park, S.E.2 of the Council of the Society) of works, or treatises on the ter funds for the purpose of (Army Retired Pay); MAURICE protecting and indemnifying interest on money lent, or rent for Amateur Service, Ra- CHILD, 60 Ashworth Mansions, premises leased by him or her to dio Science, or its appli- members of the Society from Maida Vale, W.9 (Director of Com- the Society, nor the payment of cations, or subjects con- and against unfounded claims pany); O.F. BRO WN, 13 Hamp- appropriate fees or other remu- nected therewith in the and to take steps to defeat stead Way, N.W.11 (Civil Serv- such claims, and for the pur- neration for original literary or other English or any foreign ant): J.H. REEVES. 2 Penywern pose of affording to its mem- material accepted by the Society tongue or any abstracts Road, S.W.5 (Tutor): H.R. bers legal advice and assist- for publication or inclusion in any or translations thereof or HALL IWELL, 2 Princes Road, ance in connection with their of ils publications. extracts therefrom; Crumpsall, Manchester (Electri- wireless experiments; (4) To take charge of the 5. The liability of the members is cal Engineer); GERALD books. pamphlets, pub- (e) To consider, originate and sup- limited. MARCUSE, Queens Park, lications, manuscripts or port improvements in the law 6. Every member of the Society un- Caterham (Merchant); H. BE VAN instruments at present in which may seem directly or dertakes to contribute to the as- SWIFT, 49 Kingsmead Road, the possessionof the Ra- indirectly conducive to any of sets of the Society, in the event of Tulse Hill, S.W.2 (Electrical Engi- dio Society of Great Brit- the Society's objects, and to the same being wound up during neer). Dated the 22nd day of July ain, and to observe and resist and oppose alterations the time that he is a member or 1926. Witness to the above signa- perform the Trusts of any therein which may seem to the within one year afterwards, for tures, FEARNLEY OWEN. St. deed affecting the same Society directly or indirectly payment of the debts and liabili- Michael's Alley, Cornhill, E.C.3 or any of therm or to form adverse to the interests of the ties of the Society contracted be- (Solicitor).

RADIO COMMUNICATION June 1993 47 No. 2 Fighting for the No. 1 spot. the NEW K-737 from ICOM. Auto atu & Keyer built in as standard. no silly "slider controls" and wonky plastic doors on this and At last a real successor to the IC735, read what Henry F. Lewis, 03010 has to say,.. Deposit £475.00 & 12 pay ments of £85.00 Nerf I IN No. 3 My favounte for months, the Yaesu FT890. With or without Auto ATU, a real winner for BASE or MOBILE H.F. Did you know that it is now G4l available with SPEECH ANNOUNCEMENT, (as an option), for blind operators? Only from LYNCH' Without Auto ATE/. Deposit £375.00 THE AMATEUR RADI & 12 pay ments of £85.00 With Auto ATU, Deposit £495.00 & 12 pay ments of £90.00 No. 4 M% 'INCI Probably the best selling H.F. transceiver in the world, the TS850S rillE » MU ,V ,. from Kenvvood. Certainly one of the most reliable. A true base station radio from a world beating company. U.F. TOP TEN ...... ,.., _ Without Auto ATU, Deposit £51 0.00 ...... ___ __ , .--- -- & 12 & pay ments of £95.00 in .„__ ...... With Auto ATU, Deposit £540.00 & 12 pay ments of £105.00

No. 5 0* It's crept up In price, but now only the same cost as an old 159405 listed at. 4 years agol The radio? Yaesu•s17990. For Peter Hart to use words like "thoroughly recom mended". I cant really com ment Straight in at No. 1 is the new TS-50S from Kenwood. anymore. A real MIN1-MOBILE H.F. Transceiver, no bigger than a Without int. PSU & CVV filter, Deposit £595.00 & 12 pay ments of £129.50 TR751E 2M Multi! 500kHz to 30MHz, 100w out, With both options, Deposit £699.00 & 12 pay ments of £150.00 matching auto ATU available as an option.

No. 6 DEPOSIT £199.95 & 12 payments of £66.67 At the budget end of the market, the 'corn IC-728 offers excellent performance together with the quality feel from this famous With matching Auto ATU, Deposit £295.00 & manufacturer

Deposit £195.00 & 12 pay ments of £66.66 12 payments of £83.75

No. 7 For those of you who want a good, no frills H.F. package but also want to dabble on 6 Metres, how about the Icom IC-729? Identical to the IC-728 at No. 6, but with 10 watts on 50MHz as well as a full 100 Twelve Mon watts on H F

Deposit £275.00 & 12 pay ments of £85.00 No. 8 ZER O 8 Performance and flexibility of the "big boys", the TS-690S from Kenwootl is still up in the TOP-TEN, and there's good reason. The Still saving up for that new RADIO, but worried ab price. Closely compare the spec of the '690 with other H.F. machines and the rig scores high up the ladder. Throw in a SIX METRE option you should be). Have no fear, LYNCHY's here! I've be giving a massive 50 watts output in addition to 100 on HI.. and you can see why this one k so popular deposit, (no SO% as required by my competitors), a

Without Auto ATU, Deposit £480 with NO INTEREST. The whole shabbang is subject t & 12 pay ments of £85.00 With Auto AT U, Deposit £51 0 who have to wait for you to pay them each mont & 12 pay ments of £95.00 chappy! (or lassie as the case may be). Beaten the p No. 9 the wait. Don't be shy, give it a try. 1 promise l' Want the No. 8 slot, but without SIX Metres? You got it with the TS- 4505. 100 watts, General Coverage, All Mode, Selectable filtering in HIGHEST PRICES PAID F both 'Fs Big radio features in a mid-sized package

Without Auto AT U, Deposit £449.00 IF YO U DO N T W A NT TO TAKE AD VA NTAGE OF MY FREE 6« 12 pay ments of £75.00 FIN A NCE AN D W O UL D RATHER PAY CAS H, CHE Q UE, With Auto ATU, Deposit £480.00 CRE DIT CAR D OR TR ADE-1N, THE N CALL 081 566 1120 6« 12 pay ments of £85.00 T O D AY FOR YO UR TAIL OR M A DE Q U OTATIO N. i„ni I pro mise you the best overall deal in the U.K. Get ringing, No. 10 or you'll miss the bargains! A joint entry at No. 10, The Flagships from YAESU & KENWO OD, the

FTI000 & TS950SDX transceivers. Both have features for the really •Please N OTE prices & monthly pay ments are based on serious amongst our H.F operators, including I 50-200 W output. Dual 17.5 % VAT & no more price increases! E& OE Receive, Built in Power supplies & Auto Tuners as standard, the list goes on forever. If your serious, ring me for a tailored quotation to suit your needs. If your not, ring someone else, 286 NORTHFIELD AVENUE, EALING, LONDON FT1000 & TS950S DX, deposits fro m as little as £700.00. No. 2 Not a transceiver, but a WIDE BAND AU MODE PORTABLE RECEIVER. the NEW MVT7100 from Yupiteru. As supplied by MARTIN LYNCH to the M.O.D. and countless other customers, this new model from Japan is truly amazing. 500kHZ to 1650mHZ, ALL MODE. in your hand? Are they serious? Yep. I'm handing them out like confetti. It not a toy. itS LYN the most Incredible miniature receiver available. Deposit £49.00 & 9 pay ments of £44.45 -11{S No. 3 First the FT727, then the F1470 and now the FT530. YAESU get better and better at Dual Band portable design. Complete with CTCSS fitted as standard. INONE of the others have), extended RX, AM/NBFM selectable. Auto Repeater facility. its been the choice for hundreds EXCHANGE CENTRE already. Nicads & Charger included. Deposit £100.00 & 12 pay ments of £35.75 THE MARTIN LYNCH- No. 4 'coal were the first company back in 1980 to bring you a hilly 17.11.F. TOP TIEN synthesised solid state transceiver - their technology in digital design carries on - witness the NEW IC-W21ET dual band Handle Massive dual display, Extended RX, superb "feel" to the user. ¡rs got to be the LYNCH + muTek FT736RDX from Yaesu. The most flexible multiband 2/6/70/23 all mode transceiver Nicads & Charger included. Deposit £74.00 & 9 pay ments of £45.00 available today. Complete FRONT END REPLACEMENT DESIGNED BY murek, push this transceiver to the No. I slot. The performance is now exceptional - expect to see these No. 5 Alinco have been knocking the "big three" for several years now and being used in "VHF CONTESTS" around the vvorld. they continue to do so with the 0,1-580. Ask around the Dual-Band Handle users and the odds are they'll be using one. All the bells and PT736RDX, with muTek, 2/70 operation, whistles, well built and very reliable. Deposit £495 & 12 payment of £125 Nicads & charger included. FT736RDX/6 with 6m extra, Deposit £53.00 & 12 pay ments of £33.00 Deposit £608 & 12 payments of E142.50 FT736RDX/23 with 23cm extra, 0• 1 No. 6 Deposit £623.00 & 12 payments of £160.00 When Angus Mckenzie. G3OSS said this is THE transceiver for 1Wo metres all mode. he wasn't kidding. I've been selling them for years and FT736RDX/6/23 with all bands fitted, 2 /6 /70 & 23cm, Deposit £742 & 12 payments of £175.00. there S still nothing to touch it. Full 25W out and don't forget the matching 70cm version, the TR85 I El The TR751E 2M, Deposit £149.00 " muTek FRONT END BOARDS available as "after fit kits", & 12 pay ments of £50.00. For the Tr1851E 70cm, £199.95, plus £59.00 tittong charge if required. Deposit £199.00 & 12 pay ments of £50.00

No. KenwoodS TH-78E marches Into the TOP TEN because of it's performance, excellent ergonomics, (if SONY ever designed a dual band Handle, this is what it would look like), beautiful build quality and endless user features. For people who like mind blowing 'ADVANCED' lis To Pay At facilities, wait no longer. Deposit £49.00 & 12 pay ments of £35.00 No. 8 TEREST Want a simple to use, REMOTE HEAD DISPLAY, High-Power Dual-Band Mobile, that doesn't blow your brains away whilst OUEUING ROUND ut beating the next PRICE INCREASE?, (if you're not THE HANGER LANE GYRATORY? (WHERE?, - Well get your cheque book out lads & ladies, the TM-732E from KEN WOOD is for youl Yes, It's got n advertising it for months. There's no catch, a small all the gizmo's if you want them, but If you don't, then it's got to be the easiest mobile/base FM 2/70 transceiver available. spread the balance over a whole TWELVE MONTHS Deposit, £69.00 & 12 pay ments of £50.00 the ladies at TRICITY FINANCE, (they're the battalion ), giving approval and there it is - another happy No. 9 Hands up those who want a SINGLE BAND HANDIE, but quite fancy ce increase and got your new WIRELESS SET without the thought of being able to listen to the "other mote on 2 or 707 Thought so. Kenwood thought so as well. The NEW TH28E & TH48E, much better at doing deals than I a m at poetry! Single band FM Handle, but press one button, and instantly monitor the opposite band to the one your transceiving on. They're lower priced so I can offer them on my nothing to pay (but small deposit), for 3 months R SECOND HAND GEAR! scheme.

TH28E Transceive on 2M, rx on 70cm, CALL, WRITE OR FAX - SPRING NEWSLETTER Deposit £39.00, £250 in 3 Months NOW AVAILABLE TH48E Transceive on 70cm, rx on 2M, Deposit £49.00, £280 in 3 Months Packed with interesting goodies, including 'First Impressions' by Ken Feather and Henry Lewis, an insight into using all the latest VISA Handies and H.F. products from Japan. also a look at the latest No. 10 HF Mini Mobile from KEN W OOD, plus much, much more, Still a firm favourite for people who want MULT1-MODE PORTABILJTY on TOGETHER WITH THE LATEST MARTIN LYNCH SECOND-HAND 2 Metres, the FT29OR mk11, still has the market to itself. The rest have LIST!! WRITE OR PHONE FOR YOUR FREE COPY TODAY!! given up! Available with a "clip on 25W linear. the FT29OR is the perfect all rounder for 2M operation, either portable, base or mobile.

Without matching linear, Deposit £129 & 12 pay ments of £35.00 5 4UB. Tel: 081 566 1120 FAX: 081 566 1207 With Matching FL2025 Clip on Linear, Deposit £159 & 12 pay ments of £45 The Hobby of Kings•

We all know what fun amateur radio is but if we could do anything and money was no object, would we still choose it as a hobby? King Hussein says a firm "Yes"

Prept0011APK5 RAttl(*0 iLIC)65 IS MAJESTY, King HusseinH bin Talal, JY1, is argu- ably the world's most famous ra- dio amateur. How many of us have mentioned him when in- credulous friends and relations (or the Press) ask "what on earth do you get from your radio?". It is useful to be able to demonstrate that there must be something in it by quoting household names: the late Rajiv Gandhi, King Juan Carlos of Spain, President Menem of Argentina, Senator Barry Goldwater and so on. If they can enjoy amateur radio, then it must be great for us lesser mortals. But what does someone with unlimited facilities for travel and communications really get from the hobby? In a 45 minute inter- view with RadCom, King Hussein explained his philosophy.

A Large Family WE WONDERED what first made the King aware of amateur radio? He revealed that "actually it was a very kind present (a Hallicrafters radio) that I received many years ago, more years than I care to remember. . and my interest has always been in people and in communication amongst them." It is this fascination with people King Hussein on amateur radio: "It has given me the opportunity to know people throughout the world and.... to realize communicating which is the key that we belong to a very large family that inhabits the global village which is our home now. to his interest in amateur radio. It may well also be the reason that also move away completely from erate from different countries. I it was a way to keep in touch with King Hussein has survived in whatever my responsibilities have a callsign here (GO/JY1) as friends throughout the world who power for several decades in con- were, and to have a complete you know. And I operate from the were able to help relay messages trast to many of his contemporar- break, a complete switch-off." United States, Spain, Austria, and to secure humanitarian help ies in the Middle East. Canada ... I try to operate when- as well. Such was the case in the "It has given me the opportu- Friends all over ever and wherever I can. I have period 1967-70 in particular. In nity to know people throughout constructed equipment but not Jordan communications were the world and, in many cases, to the World as much as I would have liked to." severely damaged at times and visit them later and to realize that IS HE REALLY ACTIVE? "Not as He maintains a well-equipped then we were able to . . . through we belong to a very large family much as I used to be, but wher- station in Jordan: "The equipment the help of many friends . . . that inhabits the global village ever I move to I try to come on. I I was with for many years was a secure medical assistance. which is our home now. It has have a station in this country but Drake. But right now we have "I've enjoyed also talking to all also enabled me to encourage we recently had a bit of a disaster moved on to the Icom 781." age groups with all kinds of inter- many Jordanians to be involved with the antenna - it broke. We His natural diplomacy makes ests. People who have sustained in this field, both in terms of the tried to take it down and it crashed him reluctant to single out his injuries which prevent them do- technical side as well as in terms down, as has happened to me most interesting contact but the ing very much other than using of the communications side which several times in life. It is up and enthusiasm is obvious when he their abilities to get in touch with is just as important. It has given running again now." describes what amateur radio friends throughout the world." me the opportunity, whenever I "And I've also been honoured means to him: And he's a DXer too. "I tried to have been able to be active, to to have gained permission to op- "In times of crisis and difficulty, make initially as many contacts

50 RADIO COMMUNICATION June 1993 KING HUSSEIN

as I could so that we could log them and then maybe get some AR in Jordan awards. I can't remember exactly AMATEUR RADIO in Jordan is what the number (of DXCC coun- expanding with around two hun- tries) is but we passed the 150 dred licensees of all ages. Am- mark many years ago. man has VHF and UHF repeat- "We try to help our friends ers with a very high standard of whenever they come to visit to operation and a friendly welcome operate from Jordan: we helped is given to visitors. The licensing in some of the expeditions as system is similar to ours - an well, setting them up and provid- exam leads to a B class licence ing the equipment - to provide and for an A class licence (which new areas for people to contact" includes the WARC bands) a Morse test is required. UK licen- sees can easily obtain temporary King to King JY8 callsigns. HE DESCRIBES proudly a con- Other Royal licensees include tact with the first amateur to oper- HRH the Crown Prince, El Hassan ate from space - Owen Garriott, bin Talai, JY2HT and the Chair- W5LFt... on the space shuttle man of the Royal Jordanian ARS, The Jordanian flag flies above Belgravia. Columbia: "We managed to ar- Prince Ra'ad, JY3RZ. range a schedule with him on his JY1 operates almost exclu- 92nd orbit. It was an excellent sively SSO. and sometimes in contact - something like three or contests. His QSL cards are too four minutes horizon to horizon. many to display, but the shack We were following him with a wall is decorated with awards. directional antenna." He agrees that amateur radio in what must have been a re- is a good hobby for young peo- markable contact to listen to. King ple: "We have over the years Hussein of Jordan has spoken to presented several schools with King Juan Carlos of Spain over equipment or helped them with the air. He also talked about ama- regard to club radios." teur radio with Rajiv Gandhi, King Hussein has many ham VU2RG, when they met. friends in the UK. though charac- He is obviously a man who teristically he declines to single enjoys taking to people. How, then anyone out. He has visited some does he square the obvious de- in their homes which must be the mands of the pile-up, and his ultimate proof of amateur radio desire to make friends? "I realise as the great leveller. that one has lodo both, but of late As an RSGB member, King it's become almost impossible. Hussein reads RadCom and he Because whenever one comes tells us he enjoys it. He was pre- up, within a matter of a few min- sented with a 1992 Bound Vol- utes. more than usually you would ume of RadCom and a copy of have a pile-up and my hearing is the July 1991 edition which fea- not as good as it used to be. I've tured a visit to Jordan by Robin operated aeronautical mobile Bellerby, G3ZYE, and a group quite a bit in the past on the HF from St Dunstans. In return, he bands but the pile-up is even signed a bound RadCom volume A souvenir f or the ASGO Library. King Hussein signs a RadCom bound volume. worse." for the RSGB.

Above: Robin Bellerby, G3ZYE, whose Involvement with the Anglo Jordanian Friendship Society was Instrumental in making the Interview possible.

Right: HM King Hussein, Jr1, talks to RadCom Editor Mike Dennison, G3XDV whilst Assistant Editor Marcia Brimson takes notes.

RADIO COMMUNICATION June 1993 51 BEVERAGE AND HIS 'WAVE Pe Wevedee capacitors at intervals along its length [the ANTENNA' basis of G6CJ's 'Loaded wire dipoles' de- scribed in the RSGB Bulletin, July 1961 [and THE DEATH LAST JANUARY of Harold H since then in 77, ARTand other RSGB pub- Beverage, one-time W2BML, at the age of 99 Turbe lications]. years, has taken from us one more of those "One of the famous early Beverage anten- immortal pioneers of radio communications nas was that erected by Paul Godley at who were willing to admit that their interest in Ardrossan in Scotland during the vital ama- radio engineering stemmed from amateur pnt teur transatlantic tests of 1922 when his 400- radio. Harry Beverage began as an amateur- metre long wire collected signals from a radio enthusiast, yet he rose to the highest number of American amateurs between about ranks of the professionals. Honoured in 1957 200 to 300 metres. I can recall using a war- by The American Institute of Electrical Engi- time Beverage antenna [at Hanslope Park in neers "for his pioneering and outstanding late 1941] about 0.5-mile long, on frequen- achievements in the conception and applica- cies of the order of 3.5 to 9MHz where it tion of principles basic to progress in national proved a very effective antenna [for receiving and world-wide radio communications". an Abwehr network of stations in Norway]. Beverage not only invented diversity re- "So far as signal collecting properties are ception — for long a key feature in point-to- concerned, there is little point in stringing this point communications — but also the 'Wave type of antenna higher than is required for Antenna' that for almost 70 years has gener- ordinary security and to pass over obstruc- ally been called the 'Beverage antenna', It tions. One of the organisations [BBC Monitor- was so described in QST in 1922 by Paul ing Service near Reading] currently using Godley (W)2XE who met Beverage on the Beverage antennas for the reception of over- liner Acquitania en route to the UK. Godley seas MF broadcasting stations has recently came to Britain on behalf of ARRL for the [late 1960s] been carrying out theoretical transatlantic tests in the winter of 1922/23. studies on optimum lengths and heights to Beverage in cooperation with Chester Rice see if any improvement could be obtained by and Edward Kellog (who were later responsi- raising the present antennas (from 1000ft to ble for the moving-coil loudspeaker) presented 2500ft long and about 10ft high) to a height of detailed information in a 50-plus page paper about 3011. Generally, these studies indicate 'The Wave Antenna — A New Type of Highly that the first effect of raising height is to Directive Antenna' in the Journal of the AlEE degrade sidelobe performance: the only real spread over six issues (March 1923, pp258- advantage in raising height would seem to be 269, April pp372-381, May pp510-519, June where extremely long antennas are possible, pp636-644 and July pp728-738). since additional height lowers the rate of In TT October 1970, pp686-7, I wrote: attenuation. It is also shown that by connect- "Top-band DX enthusiasts will probably need ing two Beverage antennas in parallel it is no reminding of the Beverage antenna which possible to slew the directivity over a useful has recently been used on both sides of the angle. The [BBC Research] study suggests Atlantic for the reception of 1.8MHz signals that these antennas are useful for the recep- .... The antenna was developed in the early tion of signals arriving at angles of 5° to the 'twenties for the reception of commercial horizon". I have added text within square transocean stations operating on the very low brackets — G3VA. frequencies [in the region of 15,000 metres]. As a result of Harold Beverage's work, In its simplest form it consists of a very long RCA built six VLF transmitting stations on the straight wire, extending up to several miles in Fig 1: Some of the many possible variations of the Atlantic coast of the USA, some using high- length, mounted on quite low poles, and cor- Beverage or 'Wave Antenna'. (a) The basic frequency alternators, plus one receiving sta- rectly terminated at the far end to earth so as arrangement as used by a number of amateurs on tion at Riverhead, Long Island. Here a Bever- to prevent reflections (Fig 1(a)) — not exactly 1.8MHz for long-distance reception. (b) an age antenna some six miles long erected arrangement suggested by Harold Beverage in 1923 an antenna for the amateur with only a short between Eastport and Riverhead was used to garden. for 'short waves' (le wavelengths less than about 450 metres). (c) is a variation of (b) enabling the prove the system. Terminated, very long, "But a check with the original description termination to be at the receiving site. (d) This was wire antennas can also make excellent unidi- has brought to light several features which an arrangement illustrated in the 1931 edition of the rectional transmitting antennas but in this are seldom mentioned. For instance, the nor- 'Admiralty Handbook of Wireless Telegraphy'. case it is usually necessary to raise the height mal system on VLF was to use two wires with which reduces ground absorption but de- a reflecting transformer at the far end and the grades the sharp directivity into two lobes. terminating impedance at the receiving end, Fig 2 shows a transmitting type 400ft all-band making it possible accurately to null out [off- unidirectional terminated long-wire for HF beam] interference [the same principle as the operation reported some years ago in TT Jones, the W1ETC and the VK5LR noise- (ART7 p305) by Richard White, G3SRO. cancelling systems described in TT March Further background information on the 1993]. Beverage antenna is given by Peter Lankshear "Then again, although one normally thinks Fig 2: An all-band 'terminated long-wire' Beverage in a four-page article 'The Vintage Beverage' of the Beverage as being many wavelengths antenna used in the 1970s by Richard White, G3SRO, (Electronics Australia, April 1993, pp98-101). long, this was always impossible at VLF, and and suitable for transmission as well as reception. This shows that Beverage began develop- the paper suggests that pronounced direc- It was about 400ft long, 40ft high. At the far end ment of his directional antenna in 1917 at the tional effects can be achieved with an electri- terminated with a non-inductive high-wattage 500U suggestion of Dr E F W Alexanderson, chief resistor earthed to an 8h aluminium stake via a cal length of one-half to one-wave-length — vertical down-lead. The transmitter fed the antenna engineer of General Electric (USA) to safe- putting a different order of magnitude on the via a ferrite toroidal step-up transformer using a guard wartime traffic across the Atlantic from real estate needed on HF! The Beverage is toroid of about 1.5in diameter, with 3 turns input the possibility of German jamming. Beverage related to the vee-beam and rhombic anten- and 7 turns to the antenna, blfilar wound and space. always acknowledged that he drew on the nas. and is not limited to low frequencies . . It should have a worst SWR on any band 3.5-28MHz earlier work on directional antennas by Mar- of only about 1.8:1. Unlike a low antenna this has The 1923 paper showed how the electrical two main lobes and by directing it towards central coni (1906) and the 'Ground Aerial' devel- length of the antenna could be reduced by America G3SRO got good coverage of North and oped in Germany by F Kieblitz in 1911 who 'stretching' the wire by inserting a series of South America. had found that he could obtain good direc-

52 RADIO COMMUNICATION June 1993 TECHNICAL TOPICS

tional signals at the centre of a length of wire many electronic gadgets in the home which I don't suppose that, when he wrote his supported about one metre above ground are affected by radio-frequency interference editorial, K9AY expected many of his profes- and earthed at its extremities. The first Wave at extremely low RF field strengths. He noted sional or amateur readers to disagree. How- Antenna was erected at New Brunswick (New that although some products such as TV sets ever this proved not to be entirely the case. Jersey) near the high-power US Navy station and video recorders (VCRs) have been get- He duly published (February, 1993 issue, NFF equipped with an Alexanderson alterna- ting better, consumers are buying more elec- p13) a letter from Robert Orban of Belmont, tor. tronic devices than ever, and they have a right California under the heading 'Turn down the to expect them to work reliably. He added: power before turning up the price' that puts Those RF designers who understand EMC forward a view that, however unpopular it CO MPATIBILITY — BUT WITH tell me that even a few simple concepts can may be for most amateur radio enthusiasts, HO W MUCH PO WER? help with both (unwanted) radiation and sus- should at least make us think. MOST OF US HAVE from time to time ech- ceptibility. Strategically placed two-cent by- Robert Orban wrote: "While I support your oed, or at least agreed, with the thoughts pass capacitors, minor changes in PC board idea that consumer equipment should be expressed by Gary Breed, K9AY, in his edito- layout or careful routing of cables can contrib- more resistant to EMI than most of it presently rial An EMC wish list'. RF Design, August ute many decibels towards improved EMC is, my jaw dropped when I read that the FCC 1992. He complained about there being too performance." had measured a 9 volt/metre field induced in a hapless neighbour's home by a ham run- ning a 1kW HF transmitter, This is a huge, absurd amount of RF for a piece of consumer AUSTRALIAN AMATEURS ON LONG WAVES equipment to reject! THE JULY 1923 ISSUE of the Journal of the reliability of wavelengths of over 11.000 "EMI suppression is not free. If a S300 the AIEE with the final instalment of 'The metres is so much greater than that of (retail) VCR can have no more than about $40 Wave Aerial' also contains an article 'The shorter waves. Long waves have there- in actual component cost, the cost of adding Electrical Plant of Transocean radio tel- fore been universally adopted for long sufficient EMI suppression to reject a 9V/rn egraph' by E F W Alexanderson and other distance communication." field can sigMicantly affect the selling price of RCA engineers which reflects the profes- So strongly was this opinion held that such equipment. I would ask you why tens of sional viewpoint in the days before ama- the paper concluded: -Thus it can be stated millions of consumers should be so taxed to teurs showed the value of the short waves. that guess-work has been eliminated from permit a few amateurs to indulge their hobby. Incidentally. 'short waves' in 1923 were the development of radio communication, In the 1930s. it did not seem unreasonable to wavelengths between 200 and 600 me- and that sound foundations, both techni- let people fire up 1kW rigs in residential tres! This paper stated: cally and financially, can be laid for all neighbourhoods. In the 1990s, it seems ab- "The economical wavelength for com- future expansions of our system." surd to permit this. Reducing power to 10W municating over a certain distance can be A number of countries who do not use would reduce the electric field 20dB (to 0.9V/ selected by the practical rule that the eco- long-waves (LF) for broadcasting have in m), While this is still a lot of RF, the power nomic range of a station for reliable com- recent years issued experimental LF per- level now becomes comparable with other munication is about 500 to 1000 times the mits for amateurs. In Amateur Radio (April services, like cellular phones and the like. It is wavelength. If too short a wave is selected 1993) John Adcock, VK3ACA, (with LF time for the FCC to act to reduce the permis- the signals will be weak in daytime and experimental callsign AX3T35) describes sible RF fields that amateurs can blast into strong but variable at night . . . . generally "The day we crossed the Tasman on Long their neighbours' homes," speaking for distances over 3000 miles Wave". In the past he has used about 100 I can imagine the shudder that would follow Watts to a 'back-yard' antenna. On 196kHz, an announcement by the Radiocommunica- however, efficiency is very low with only tions Agency that maximum output power of about 0.2W radiated. Nevertheless with UK licences would shortly be reduced from this set-up at Oak Park, Victoria, his sig- 400W to 10W! It is true that, like all pre-W W2 nals have been heard all over Victoria, newly licensed amateurs, my own licence (or Adelaide, Hobart and parts of New South more precisely the G3VA issued to my father Wales in daylight and as far away as on my behalf) specified a maximum of 10 Brisbane at night. Watts DC input on the, then, 1.7, 7 and His latest exploit, using the rather more 14MHz bands only. In practice this proved efficient 1.8MHz antenna of VK3BDJ at sufficient power for me to work enough CW Gordon, Victoria, was heard in New Zea- DX on 14MHz and European AM phone on land across the Tasman Sea (roughly 1.7 and 7MHz that I did not bother to apply about 1200 miles) by ZL3PN. ZL4MD and (through the RSGB) for a 25-Watt permit after ZL2CA although atmospheric noise was six months. A few pre-war UK Old Timers fairly bad. 3.5MHz was used for call-back. held high-power permits of up to lkW. With so The antenna at VK3BDJ is built in typical many 'straight' receivers still in use, I found broadcast antenna style comprising a tri- that even my 10W of 1.7MHz AM phone could angular steel lattice galvanised mast 109f1 be heard by broadcast listeners in the town. high standing on a base insulator. It is BCI was a problem long before TV arrived on guyed with three sets of guy wires radiat- the scene. ing out in three directions at 120' around It is clear that we cannot really expect the mast, with eight levels of guys verti- consumer-electronics receiver and appliance cally. To improve the loading and capaci- manufacturers to build into all their products tance of the antenna on 196kHz an extra sufficient RF immunity to cope with a high- 16ft vertical steel pole was added to the power transmitter a few feet away. In the top, to which a top load of some 30 radial 1930s, power levels at most UK amateur wires around 50ft long was also added. A stations were much lower than those at pro- counterpoise was constructed at the base fessional transmitting sites, such as broad- consisting of a hexagon of wire with six cast, coast stations, fixed point-to-point serv- radial spokes, with each span about 16m ices and these were seldom located in resi- Fig 3: The antenna that put signals across the long suspended from eight poles about dential areas. Today, the situation is very Tasman Sea from Australia to New Zealand on 3m high, and insulated with stick porcelain different and there are many TV local relay 196kHz with under 100 Watts (radiated power insulators: Fig 3. Even so it is probable probably under 10 Watts) . . . . (a) Outline of stations, cordless telephone transmitters antenna (guy wires not shown). (b) Antenna that radiated power on 196kHz is less than working at what amateurs would regard as loading arrangement. 10 Watts. QRP. And for mobile transmitters for cellular radio, PMR (private mobile radio) etc. only a

RADIO COMMUNICATION June 1993 53 TECHNICAL TOPICS few military vehicles have comparable power nese kanji characters) the amplifier can pro- valve socket. A two-part article on 'Grounded to the maximum powers that can legally be vide some 120W output on SSB/CW and Grid Linears' by D Kooistra, PAODKO, (Elec- used /M by amateurs. 50W on FSK/AM with 15W PEP drive. But, to tron, February and March 1993) recalls an alternative approach which was described by David Sumner, K1ZZ, in his editorial (OST my mind, the most interesting feature of this Harold C Barber, W6GQK, and Robert I Suth- March 1993) introduces two articles that ex- design is the use of a high-voltage-multiplica- erland, W6UOV, in 'High-Power Zero-Bias plore the question of using appropriate power tion PSU in which some 800V HT is derived Grounded-Grid Linear' (OST, September for fixed rather than mobile operation. He from a mains transformer with a secondary 1961). This presented full constructional de- writes: "There are occasions when the maxi- winding rated at 120V 0.8A and five power diodes plus some 350V electrolytics. With tails of a lkW (1500W PEP output) amplifier mum legal power is necessary. There are using the then new 3-400Z zero-bias triode: also plenty of times when it isn't. Knowing the high-voltage transformers, even the 350-0- Fig 6. difference and acting accordingly has always 350V secondaries formerly widely used in The authors pointed out that the driving been a part of responsible operating." audio-amplifiers, no longer readily available, and usually quite costly, voltage multipliers impedance of the 3-400Z is a nominal Carl D Gregory, K8CG, describes the use with silicon power diodes become increas- 122ohms: "Since this figure varies widely of automatic RF power control for AMTOR ingly attractive. For example, the late John over the operating cycle, a high-C tuned operation, drawing on power-adaptive sys- Brown, G3EUR, showed TT. October 1989, cathode circuit, Cl -L1, is employed to stabi- tems developed in recent years for profes- p37) how a 15V + 15V transformer could be lize the load impedance as seen by the ex- sional and military data transmission. At the used to provide both heater and 150V HT citer. Filament voltage is applied to the tube receiving terminal, incoming signals are evalu- supplies for a two-stage QRP transmitter via the coil of this circuit which is in the form ated and the terminal automatically transmits based on the PCL84 triode-pentode valve still of a coaxial winding having two sets of taps. back control signals that adjust the power of readily available: Fig 5. One set of taps (S1B) is for establishing the distant station. The 7L1OPH transmitter uses the tuned resonance in the various bands. Excitation is A long article 'Transmitter Power: What it cathode approach in conjunction with heater fed to the second set (S1A). The latter is set is, What it does. and How to use it' by Diehl chokes L1, L2 (1000-1, 4A rating) which can for minimum SWR on the coaxial line from the Martin, N5AQ, and David Newkirk, WJ1Z, involve some loss of filament voltage unless exciter (500hms). The usual driving difficul- stresses that excessive power is worse than care is taken to check this carefully at the ties experienced with grounded-grid amplifi- wasted - it represents potential interference. As someone who usually runs an 813 power 11 amplifier providing rather over 100W HF out- RSGB RF out put on CW. I can recognise that at times, R I particularly on 3.5 and 7MHz, this is more 100R than necessary - reflected in those S9 + I W 20dB reports. The answer for CW operation VI would seem to be a switch to cut power by an 809 150pVC2 order of magnitude or so (I do in fact have a 100p 500v switch that turns off the screen voltage on the 3kV 813 and must remember to use it more of- ten!). For SSB there is the problem that the linearity of an amplifier is optimum when 4700p correctly adjusted for its rated output. 3kV An editorial in Amateur Radio (April 1993) by Ron Henderson, VK1RH, Federal Presi- dent, 'Being a Good Neighbour' points out that while Australian licences, like those in the UK. have a power limit of 400W PEP, very few linearsare available in Australia of that rating. 12 He writes: "The most common is 1.2kW with „y(RF some up to 2kW; three to five times the legal limit. It would be naive to think all of these are meticulously adjusted to 400W PEP. How 809 Patt.e M I natural the temptation must be to up the connections 474 350V 150mA output as the sunspot number falls. s d "In living with our neighbours we will all be Di- t +800V faced at one time or another with the problem 47ki 220kR7 of RF interference .. . . if the neighbour's TV 350V OW5 is a cheap import, fitted only with rabbit's ears + 100/4 (set-top antenna), the authorities will gener- R3220k ally support us. But what if that TV has passed OW5 a stringent type standard? Now the laws of nuisance apply; the neighbour has as much 330k134 right to receive clear TV as the amateur has OW5 to pursue his hobby e. D5 01— 05 ern 5 A 14M HZ 50/120 W VALVE x 10 010 A MPLIFIER ONE DOES NOT TEND to associate the FCI 3V0 Japanese with valve equipment. But looking 2A0 140 through CO ham radio (Nr 2/93) my eye was 0-0 caught by the diagrams for a grounded-grid AC et1 I triode amplifier by 7L1OPH using one of the NO-0 _000 R5 14 100R relatively ancient 809 directly heated triodes: +I35V IOW Fig 4. If I have understood the article correctly 06—D9 et (CO ham radio has a curious mixture of x 10 010 Arabic figures and type numbers within Fig 4: The 14MHz 50W grounded-g id 809 linear amplifier described by 7L1OPH In 'CO ham radio' No 2/93 masses of the impenetrable (to me) Japa- showing the use of a voltage-multiplying PSU in conjunction with a 120V 0.8A transformer winding.

54 RADIO COMMUNICATION June 1993 TECHNICAL TOPICS ers are entirely absent and no coupling prob- through the tubing, leaving about three inches depots and at petrol station forecourt areas, lems have been found in switching from band protruding from each end. Be sure you sand particularly if spillage occurred. Flammable to band. Increased power output, reduced the ends of the tubing to a smooth, rounded gases and vapours which can be ignited by intermodulation distortion, and ease of drive edge to prevent marring or scraping the insu- an electric spark include fire damp in mines, are gained when a tuned cathode circuit is lation of the wire during this operation. Wire methane and petroleum spirit, ethylene and used in preference to the old-fashioned with enamel insulation should not be used, hydrogen. untuned RF choke input circuit. since enamel is too soft and may be easily Fortunately, there are few recorded explo- "The tuned cathode circuit is built as a damaged. Next, the coil is wound around a sions that can indisputably be ascribed to the discrete sub-assembly. The unit consists of 15/8th inch form (a section of water pipe may operation of mobile or fixed transmitters, al- the coaxial coil L, the tuning capacitor Cl the be used) making a coil of approximately 10.5 though much evidence of sparks induced coupling capacitor 02, bypass capacitors C3 turns ...." The 1961 article provides detailed across gaps in metal structures by high- and C4, and band switch sections S1A and constructional information on what was clea rly power broadcast transmitters (see for exam- St B. The coaxial coil is wound from a 61in a high-performance linear, but my purpose ple 'Sparks flying in Riyadh' TT, September length of standard 3/16in soft copper tubing . . here is primarily to give a reminder of the use 1984, p774). . . Before the coil is wound a length of No 12 of a coaxial-coil for the tuned cathode circuit. Mr Colwell added: "For radio telephone Formvar, insulated copper wire is passed equipment, the maximum effective radiated power that can be authorised [for profes- FLAMMABLE ATMOSPHERES, sional or commercial applications] is 25 watts EMC HAZARDS AND MOBILE and their frequency bands range from 41MHz RADIO to 960MHz. In practice, each application is A RECENT IEE COLLOQUIUM "Operation considered with due regard to range required, of radio transmitters in proximity to flammable base transmitter antenna height etc, and to atmospheres" included a report by Brian the possibility of interference to or from adja- Colwell (ERA Technology) on a study carried cent transmitters in terms of location and out on behalf of the DTI on The safe use of frequency. The net result .... is that transmit- ter powers, particularly for mobile or hand radio transmitters on road tankers and other vehicles'. This noted that "The benefits of use portable sets, are licensed generally for much of mobile radio telephone systems, particu- lower effective radiated power than the maxi- larly by sales and distribution personnel, led mum. The effective maximum is less than 10 to their proliferation. Similarly, the use of CB watts ERP . . . . CB radio transmitters are radios amongst lorry drivers proved a useful currently authorised to operate on 27MHz aid to the advance warning of traffic jams or (2W ERP) and 934M Hz (25W) although early Fig 5: The late John Brown, G3EUR showed how a other hazards so avoiding action could be use on 27MHz was AM. Illegal use on 27MHz one-valve C1RP transmitter could be powered from using a 100W power amplifier ('bwner') was taken." a 15V + 15V, 15-20W torold or laminated core considered in the study . . . . Some concern transformer.D1 -D4 1N4003. C1-C4 50pF (100V). C5 It was foreseen that flammable atmos- 25pF (200V). pheres could occur at the tanker loading had been expressed that an Army Land Rover

Fig 6: The 1kW zero-bias ground-grid linear described in 1961 by WEGOK and W6UOV showing the use of a coaxially-wound filament coil.

RADIO COMMUNICATION June 1993 55 TECHNICAL TOPICS carrying operational radio equipment could transmit adjacent to a petrol station . . . . A MORE ON THE DIRECT-READING CAPACITANCE METERS range of amateur radio transmissions were considered up to 1240MHz at the authorised AN ERROR IN THE ORIGINAL Break-in rangement works fine for all sizes and maximum transmission powers. This fre- circuit diagram for the direct-reading ca- shapes of capacitors, even those with quency was chosen as the highest at which a pacitance meter (Fig 2 of the April 77) 0.25in leads. simple monopole/dipole antenna would be although fairly self-evident by comparison "The circuit diagram contains a few used . . . ." with Fig 1, slipped through into TT and is minor errors — RA and RB for the 5j.rF While this particular study concentrated on corrected in the comments by John Wylde, scale should be 8.2M and 1M (not 8.2k transmitters likely to be used within tanker ZL1ALS, published in the October 1992 and 1k). Also the text and circuit are at vehicles, it is clear that there are circum- Break-in: "Congratulations to ZL2AKW on odds re the top range — 5pF or 10pF. I stances where even 25W transmitters could his capacitance meter design — simple, adjusted R4 to make Si multiply by 20 create a small but potentially hazardous spark. practical and it works. With a little tweak- giving me a 101.1F range, others may The ERA report found The worst case situa- ing of the range resistors I had mine choose to make it x10 and 5pF." tion observed was at a petroleum distribution working quite accurately three days after Ken H Green writes: "For the original receiving the September Break-in but with terminal where an overhead gantry is used to direct-reading capacitance meter (Fig 1 of top or bottom load a tanker lorry. These a few modifications due to my junk box not the April TT) you point out that it is neces- situations gave a URA (Unintended Radio producing all the specified components: sary to avoid overloading the 50pA meter Antenna) loop perimeter of 9.5m. For a trans- (1) I used a 7805 regulator with a couple movement — how true! May I suggest a mitter onboard the same vehicle the antenna of diodes in the E lead to produce the 6V. modification that would eliminate the prob- had a worst case separation distance of 1m (2) 0-50trA meters cannot be bought in lem while, at the same time, allowing the from the nearest top loading tank inlet. Like- Whitianga on a Sunday and would be use of other less sensitive meters. wise, the separation distances from the URA expensive anyway so I installed a modi- I was given an old AVO valve nnultimeter were identified for the range of transmitter fied crystal socket on the panel and plug in which uses a 30pA movement; its inter- types and the fuel loading/unloading loca- my multimeter switched to the 10mA scale. mittent behaviour I traced to a burned out tions not given at the IEE presentation]." Fig The socket is shunted with a 4k7 trimpot to meter coil — puzzling since the balanced adjust to 50pA FSD. (3) Instead of termi- 60 shows examples of how URAs with spark driver-amplifier was capable of only 40uA nals for Cx I brought out short leads with gaps can occur. maximum output. One of the current shunts small alligator (crocodile) clips. This ar- All this emphasises once again the advice appeared to have been burnt too. given before in TT that mobile transmitters "A replacement meter was available as should never be used on petrol-station fore- far as shape and size/type was concerned courts. Some instruction manuals provide but had an FSD of 100pA. A local contact such a warning but manuals may not be with younger fingers than mine swapped passed on to those buying equipment sec- the meter scales and t turned it into a 30pA ond-hand etc or such instructions may be FSD meter with the aid of a bit of modem disregarded as unimportant. electronics magic — details submerged in There is, however, another reason why the compost heap but something like one should be very careful when installing Fig 8. I padded the meter out so that it mobile transmitters of more than just a few gave FSD when connected across a 9V watts output. Many modern cars are fitted battery and then fed it from the main body with all sorts of microprocessor-controlled Fig 8: An arrangement used by Ken Green tha via an op-amp current-to-voltage con- gizmos that cannot cope with the RF from not only permits the use of a less sensitive verter. Works like a dream and my previ- typical amateur transceivers. Consider the meter movement but also prevents the meter ous meter is bomb-proof." sad story of VV8JH as reported initially in from being destroyed by an overload. WorldRadio, then CO Magazine (May 1992) and most recently reprinted in Break-in (Sep- tember 1992) by John Walker, ZL3I B: "W8JH found out the hard and expensive 8) it was emphasised that the use of CMOS way that the 1992 Toyota Camry automobile microprocessor-controlled systems in cars, will definitely not support any mobile opera- combined with the increasing use of 'com- tion with an output greater than 10W. It was posites' such as fibreglass rather than metal, confirmed via Toyota's hotline that anything was causing car manufacturers to take seri- over 10W would in a sense fry the car's on- ously the question of immunity against strong board computer. In W8JH's case repairs came RF fields, including those from nearby radio, to S1,115 for which he was responsible. What television, radar stations and carphones. But is becoming evident is that our electronic I added that "it should not be forgotten that marvels are sometimes a two-edged sword, few manufacturers contemplate the possibil- What we like as features in a particular car ity that a radio amateur may wish to install a and what makes us lean towards purchasing high-power transmitter in the vehicle." that model may also be at great odds with The Toyota incident would seem to confirm using that vehicle for mobile operation. Obvi- that while increasingly car electronics are ously, Toyota did not take into account in their being designed to make them less vulnerable design the [relatively few] potential sales to to strong local RF fields, this holds good only Amateurs. for transmitter powers of less than about ten "If you are interested in mobile operation watts. (beyond the occasional use of a hand-held Remember this when installing one of those unit) scratch this model from your list of 40W models, or when contemplating really options. Use W8JH's experience to help when high power HF mobile operation. Sudden you select any new car. Specifically ask if failure of. for example, electronic breaking there will be a problem if you operate a mobile could be extremely dangerous — as well as rig. We can now add cars to computers and being costly to repair. Whether we like it or other home entertainment devices as having not, it is unrealistic to expect the vehicle Fig 7: How a metal structure can form an 'unintended potential RF susceptibility problems. It does manufacturers to provide immunity to radio antenna (URA)' with a discontinuity forming a seem odd, though, that we. in a lawful man- transmitter powers significantly higher than potential spark gap when a transmitter is located in ner, should represent the problem." those found in the cellular or PMR mobile the immediate neighbourhood. (a) Tanker loading facility. (b) Mobile crane. (ERA Technology). Five years ago, a TT item 'Vehicle EMC services. affects reliability and safety' (May 1988, pp347- G3VA

56 RADIO COMMUNICATION June 1993 GET ON 611 FOR UNDER £200!

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RADIO COMMUNICATION June 1993 57 El 2 metre SSB/CW Transceiver

Concluding a three part article by Bernie Pallett, G3VML

HE FINAL PART of this article eatures the power amplifier f(module 10) and low pass filter (module 11). Alignment details and assistance with basic fault finding arepr also given, together with kit and printed circuit board details.

POWER AMPLIFIER (MODULE 10) THE LINEAR POWER amplifier (see Fig 10) is based around a 2N4427 bipolar transistor and is rated for 600mW CW output into a 5052 resistive load. The quiescient collector current of transistor TR1 is set to 15mA by adjustment The LPF (modulet 1) is shown adjacent to the Power Amplifier (module 10). Both are mounted on the rear of the base bias via variable resistor RV1. panel of the transceiver. Instructions for this procedure, together with the adjustment of the input and output 144 MHZ LOW-PASS FILTER countersunk ground-plane side bore holes. A matching circuits, are described opposite. (MODULE 11) PCB countersinking tool should be used where necessary, alternatively a 1/4 inch drill bit THE IMPEDANCE at the filter (Fig 11) input should suffice. Do not, however, countersink Power amplifier (module 10) and output terminals provides a suitable match the bore holes allocated for the chassis Components list for 5052 coax cable. The insertion loss of this grounded component leads, or the wire links filter is less than 1dB, whilst the attenuation of from the ground plane to the underside circuit the second and subsequent harmonics, is in Capacitors track. Component leads which are grounded, excess of 49dB. or connect to the underside circuit track. C1,C3 10nF min monolythic should where possible be soldered on both ceramic sides of the board. C2 1i1F 16V electrolytic Low-pass Filter (module 11) TC1,TC2, 5.5 to 65pF miniature Components list Use 28SWG tinned copper wire to make TC3,TC4 RS (Electromail) 125- the Toko S18 inductor coil taps. Care should 660 or equivalent Capacitors be taken to use a small soldering iron bit and Cl ,C3 27pF miniature ceramic only apply sufficient heat in short bursts. This Resistors 0.25W 5% will prevent damaging the coil former when C2 33pF miniature ceramic RV1 5k0 pre-set resistor, making coil taps on the wire links. vertical mounting Inductors Before making each soldered tap, examine R2 22OR L114 3 turns, 18SWG enam, the coil construction against the relevant cir- R3 22R 3/16in ID, close wound cuit diagram, to determine the correct tap L213 5 turns, 18SWG enam, Semiconductors position. 3115in ID, close wound TR1 2N4427 The completed circuit board modules are D1 1N4148 mounted on the mainframe chassis with 0.25in, 6BA tapped metal stand off pillars Inductors CONSTRUCTION together with the appropriate length 6BA bolt, L1 1 turn, 22SWG IT IS DESIRABLE TO HAVE access to a spring washer and 6BA nut. Miniature Teflon copper, 0.25in ID soldering station plus some good quality hand 505,2 coax is utilised for inter-module RF cir- L2 5 turns, 22SWG enam tools, before beginning construction. This cuit connections. project is too advanced for the Novice con- copper, close wound, The cabinet dimensions to house the fin- structor to attempt alone. 0.25in ID ished product are not critical, but it is advis- L3 3 turns, 22SWG enam All the printed circuit boards which process able not to use a metal cabinet at least 7.5in copper 0.25in ID RF signals are double sided, with the top side wide, 2.5in high and 10in long. It is important RFC1 7 turns, 28SWG forming a ground plane. to bond all the cabinet metal covers electri- enam, wound on During assembly of the Printed Circuit cally to the main cabinet chassis — this helps FX1115 ferrite bead. Boards, refer to the respective circuit and avoid possible RFI problems. Where metal Also fit a ferrite bead component layout diagram. Note carefully decking is fitted within the cabinet, it is vital to the lead of R3. the relative position of each component be- that all the circuit modules containing heat fore fitting. Also, remember to close crop the sinks should be fitted to the upper deck. Additional items unused terminal pins on the Toko screened A commonly available vernier dial mecha- Heat sink Push-fit lobbed finned inductors, before installation. nism was fitted for VFO tuning control pur- 80 C per watt. Ensure that the double sided PCBs have poses.

58 RADIO COMMUNICATION June 1993 A 2M SSB/CW TRANSCEIVER

crystal -this method could save a lot of time 0 RSGB RFC1 and effort. +12V VFO and Mixer - Fig 3 R V1 5k0 L2 Next, the frequency counter test-probe is TC3 connected to the buffer amplifier output, junc- L3 tion of inductor L9 and the source of FET TR5. R2 TC1 • RF Fully mesh and unmesh the tuning capacitor 122OR out put VC13, and note that the indicated frequency RF TR1 varies between 7.0MHz and 7.2MHz. To input 2N4427 FB achieve these limits adjust both trimmer ca- pacitor TC1 and inductor L7. With the aid of R 3 an accurate gate dip oscillator, tune (by slug TC4 22 R adjustment), the tuned circuit of L3 to 126MHz, TC27 .- TC1 to TC4.... and the tuned circuits of L5 and L6 to 5p5 to 65p 133.5MHz. Transfer the frequency counter C2 C 3 D1 V 1;10 probe to the junction of resistor R7 and ca- 10n OV 1N4148 16V OV pacitor C7. e • • Place a temporary short circuit link across the tuning capacitor VC1, and select the * Heatsink required range from 144.0MHz to 144.2MHz by apply- ing +12 Volts between the open end of resis- Fig 10: Module 10, the 600m W linear amplifier Is based around a 2N4472 bipolar transistor. tors R14 and R15 respectively. Make sure that the frequency counter indicates 126.3MHz all the RF tuned circuits to the required reso- Li L2 L3 L/. followed by 126.5MHz. To obtain the best all- nant frequencies, and then to ensure that all round results for both frequencies, some ad- the oscillator circuits are operating within Cl C2 C3 justment of inductor L2 may be required. 127p 133p 127p their assigned frequency limits. Provided that o there are no component or constructional rt Gnd RF Driver Modules 3 & 4 - Fig 4 faults, the remaining final adjustments are r17 RSGB carried out on the completed transceiver un- With the aid of a GDO, tune by slug adjust- der simulated operational conditions. Before ment the tuned circuits of inductors L1, L2 Fig 11: Module 11, the 144MHz low pass filter. carrying out any alignment checks or adjust- and L3 of Module 3 to 133MHz. In the case of ments, it is advisable to allow a 30 minute Module 4, the tuned circuits should be ad- TEST EQUIP MENT (MINIMU M warm up period. justed to resonate at 144MHz. REC O M MEN DED) 144MHz Band Pass Filter - Fig 8 a) Multimeter M ODULE ALIG N MENT With the aid of a GDO, tune by slug adustment b) Frequency Counter (operational to SSB Processor - Fig 2 inductors L1, 12 and L3 to resonate at 144MHz. 146MHz) Connect the frequency counter test-probe to C) VHF Signal Generator the cathode of diode D105. Switch between FINAL OVERALL ALIG N MENT d) Gate/Grid Dip Oscillator (operational to the USB and LSB carrier frequencies and — RECEIVE MODE 146MHz) note whether the frequency counter indicates 10.7015MHz and 10.6985MHz respectively. COUPLE A SIGNAL GENERATOR, with CW e) RF Dummy Load 500, 1 watt To obtain these results, adjust trimmer ca- output frequency 144.000MHz, to the f) Toko S18 Trimming Tool (obtainable from pacitors C137 and C136. transceiver aerial connector. Apply the 12 Maplin or Cirkit) It is worth noting that most modern fre- volt DC power. Ideally the local oscillator quency counters have sufficient sensitivity to driver module should be adjustable to deliver BASIC FAULT FIN DIN G monitor the crystal oscillator stray RF field. a 7dBm, 133MHz waveform into a 50Q resis- Place the counter test probe very close to the tive load, but for this measurement a VHF RF WITH THESE TYPES OF PROJECTS, the Millivoltmeter with a 50Q input impedance most likely faults are those caused by simple would be an additional test equipment re- constructional errors. Before proceeding fur- quirement. ther, it would be wise to ensure that the transceiver inter-module wiring is correct. An alternative alignment method is as fol- especially anything relating to the power sup- lows: plies or signal circuits. If a particular module Tune the transceiver VFO to the applied is suspected then first check that the circuit input signal, then decrease the input signal conforms to the relevant circuit diagram. level until the transceiver 'S' meter needle lifts just above zero. Adjust the local oscillator Check especially all resistance values and driver inductor L4 and the trimmer capacitors circuit continuity with the aid of a multimeter. TC1 and TC2 (module 3) for maximum 'S' If fitted to the module in question, check all meter indication. The local oscillator driver fixed parallel tuned circuits by placing a GDO close to each inductor. Should it not be pos- board is correctly aligned, when with the input signal is removed, the 'S' meter needle re- sible to obtain a pronounced dip on the GDO turns to zero. then an inductor could have been incorrectly installed, or perhaps an associated tuned Fine readjustment of the tuned circuits circuit capacitor is of the wrong value. formed by inductors L5, and L6 (module 2) and L1, L2, and L3 (module 3), should further ALIG N MENT PROCEDURES ' improve the receive sensitivity as observed by the 'S' meter indication. As an additional THIS SUGGESTED ALIGMENT procedure check, connect a frequency counter to the assumes that the constructor has already output terminals of the local oscillator driver gained a little prior experience of servicing (module 3). Tune the VFO between the upper VHF equipment, whilst at the same time and the lower frequency limits and note having access to some basic test equipment. The LPF and power amplifier are mounted on the whether the frequency counter indicates be- The overall plan of attack is firstly to adjust rear panel. tween 133.3MHz and 133.7MHz +/- 10kHz.

RADIO COMMUNICATION June 1993 59 A 2M SSB/CW TRANSCEIVER

With the transceiver connected to the input signed to operate from 7.0MHz to 7.2MHz, it COMPONENT KITS AND signal source, carefully adjust the preamplifier is also possible to cross check the VFO dial PRINTED CIRCUIT BOARDS (Fig 6), by means of trimmer capacitors TC1, calibration against that of an accurate HF TC2 and TC3. tune the preamplifier for maxi- Receiver dial frequency readout. For exam- NOTE THAT COMPONENT kits are parts mum 'S' meter deflection. Remove the input ple, when the lower frequency range is se- only (PCBs must be ordered separately). signal to the transceiver and observe that the lected, 7.0MHz equates to 144.0MHz and G3TS0 SSB Processor (module 1) 'S meter indication falls to zero. 7.2MHz to 144.2MHz. Transceiver transmit/ Component kit: £69.00 (excl filter and xtals) receive frequencies on the upper range are Filter and xtals for above: £35.40 200kHz higher - ie 144.2 to 144.4MHz. In FINAL OVERALL Printed circuit board: £8.75 other words, 200kHz is added to the fre- ADJUSTMENT - TRANSMIT quency on the lower range. VFO/Mixer (module 2) CONNECT A 50Q, 1 WATT dummy load, via Component kit: £12.50 (excl xtals) a milliwatt through-line power meter, to the CONCLUSIONS Xtals for above: POA RF output terminals of the RF Driver (module ALTHOUGH THE TRANSCEIVER OUTPUT Printed circuit board: £7.00 4. Fig 4). Also, connect the microphone and power is limited to 600m W, this was found to the headphones/speaker to the transceiver. be sufficient to make local SSB contacts with 133MHz Driver (module 3) Next, switch on the 12 volt power supply. other stations within a radius of 30 miles, Component kit: £11.50 Select 'CW' mode via the front panel 'SSB/ using a loft mounted Slim Jim aerial. Where Printed circuit board: £3.95 CW' switch, then ground the 'key' input line. more RF radiated power is required, the trans- Adjust the tone oscillator trimmer ceiver output power is more than enough to 144MHz Driver (module 4) potentiometer RV2 of Module 9 (Fig 9), for drive an external linear Power Amplifier, such Component kit: £11.50 sufficient headset/speaker 1kHz side tone as the Wood and Douglas type 144-Lin-108 Printed circuit board: £3.95 volume. Then rotate the wiper of RV1 (o/p 1) which is now back in production. A home-built Control circuit (module 5) two-thirds fully clockwise. amplifier could also be used - see the RSGB Trimmer capacitors TC1 and TC2 (module VHF/UHF Manual (chap 5), G R Jessop. Component kit: £3.60 4) are adjusted for maximum observed power G6J P. If the particular amplifier used shows Printed circuit board: £2.50 on the through-line milliwatt power meter, up excessive harmonic radiation, an addi- RF Pre-amplifier (module 6) remove the chassis ground from the 'key' tional low-pass filter (LPF circuit and con- input line and note that the indicated power struction as given for module 11) should Component kit: £4.60 instantly falls to zero. Achieving this result reduce this to an acceptable level. Printed circuit board: £2.50 may also entail slight stretching or compres- 750Hz audio filter (module 7) sion of inductor L4 of module 4. Component kit: £5.60 Select 'SSB' mode via the 'SSB/CW' mode Printed circuit board: £2.50 switch, and blow into the microphone a few times noting that the indicated power of the 144MHz Band-pass filter (module 8) milliwatt through line power meter rises and Component kit: £4.00 falls in sympathy. Slightly readjust inductors Printed circuit board: £2.50 L1, L2 and L3 of module 4 to maximise the indicated output power peak and trough ra- Tone oscillator (module 9) tios. Component kit: £3.50 If, because of excessive circuit instability, Printed circuit board: £2.50 these results cannot be met, then it may be necessary to overcome the problem by in- 600mW Linear amplifier (module 10) and stalling interstage screening bulkheads on 144MHz Low-pass filter (module 11) the ground plane side of the PCB. Next, Component kit (2 modules): £5.50 readjust the tone oscillator potentiometer RV1 Two printed circuit boards: £3.50 for the minimum lkHz output to fully drive the The 144 Lin 108 from Wood and Douglas boosts the output to 10 watts. SSB Processor board to give the rated CW The above kits of components are avail- RF power output. able from: JAB Electronic Components, The finished product performs well and Connect the output of the RF driver (mod- The Industrial Estate, rear Queslett Motors, compares very favourably with commercially ule 4), to the input of the 600m W PA, (module 1180 Aldridge Road, Great Barr, Birmingham built equipment within the 'budget' price range. 10 - Fig 10). Connect the milliwatt through- B74 4JF. The cost of building the complete transceiver, line power meter, plus the 50Q dummy load to Printed circuit boards are available from excluding hardware, should be well under the transceiver aerial connector. Badger Boards, 87 Blackberry Lane, Four half that of a commercial transceiver at to- Oaks, Sutton Coldfield B74 4JF. A complete Next, apply the 12 volt supply and select day's prices. 'CW' mode via the front panel 'SSB/CW' set of boards for the project is available at the It is advisable to wait a few minutes from specially reduced price of £25.50 inc p&p. mode switch, and ground the 'key' input line. power-up before operating, to enable the Adjust the PA trimmer capacitors TCI, TC2, transceiver oscillator circuits sufficient time to TC3 and TC4 (module 10 - Fig 10), for stabilise. After the warm-up period the trans- LINEAR AMPLIFIER KIT maximum indicated CW power (approximately ceiver was found to have a very slow cyclic MANY READERS MAY wish to boost the 600 mW). To achieve this result it may also be frequency drift of approximately +/- 300Hz. 600m W RF output from the transceiver. The necessary to stretch or compress inductors By fitting a 5pF airspaced bandspread tuning 144Lin10B, 10 watt PEP output, linear ampli- L1 and or L2 of the PA module. Select 'SSB' capacitor in parallel with the main tuning fier kit from Wood & Douglas has been found mode and blow into the microphone. Note capacitor (VC1), there was no problem in particularly useful in this role (see photo- that the observed output power rises and falls tracking stations and compensating for the graph). These are now available from the in sympathy. slow frequency drift. company, price £35.00 + VAT, and full as- Wood & Douglas Communications have sembly instructions are included. DIAL MECHANISM pointed out that their 144PA4 amplifier (circa The first ten PCBs will be sold as assem- THE TRANSCEIVER VERNIER DIAL should 1981) used a very similar circuit to the RF pre- bled boards at the kit price. These have been be calibrated against the measured frequency amplifier (module 6) in the second part of this professionally built to ensure that operation is of its RF carrier output, as indicated by a VHF feature. They mention that the bias network is entirely satisfactory in this application. Order- frequency counter. From this, a frequency suitable for the original 3SK88k MOSFET, ing address is: Wood & Douglas Communi- conversion chart or table, can be compiled for and the current 3SK88I type may require cations Products, Lattice House, Baughurst. both the upper and lower frequency tuning some experimentation with the values of R1/ Basingstoke. Hampshire RG265LL. Tel: 0734 ranges. Since the transceiver VFO is de- R2/R3 for optimum performance. 811444.

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Auto repeater mode £449.95 A M Airband Reception inc VAT Expanded Receive to 950M Hz

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RADIO COMMUNICATION June 1993 Design Of Active Butterworth filters

Part 1 of an article by Dr G Brown, B.Sc, Ph.D, C.Eng, FIEE, G1VCY

• The stop-band is not infinitely attenuating, sented here will make the design decisions UTTER WORTH FILTERS have a long and distinguished history but has finite attenuation, and is asymp- fairly straight forward once the magnitude of in electronic engineering. Until totic [see Glossary of Terms) to the zero a particular application problem has been recently, they were composed of response axis, ie the output is zero only at assessed. The preceding discussion assumed passive devices - inductors, ca- infinite frequency. that a band-pass filter was to be used, one pacitorsB and resistors. However, the increas- where the pass-band is sandwiched between This discrepancy between theory and prac- ing need to implement filters with easily- tice does not surprise most people, even if the two stop-bands. Such a filter is easily imple- mented by cascading (ie connecting one after controlled characteristics at lower frequen- reasons are somewhat deep-rooted in mathe- the other) low-pass and high-pass sections, cies has caused the passive realisation to matics. What concerns us here is that it is the as illustrated in Fig 2. Note, however, that the give way to the active version, using opera- real filter that we have to live with, and thus we pass-band is defined by two frequencies, I-I tional amplifiers. must know how to work with and understand and f2. with f2>f1; the cut-off of the high-pass Although the active filter does give easily- the imperfect shape. To this end, it may seem section must occur at the lower frequency, controlled characteristics, it is perhaps more surprising that, in the design of Butterworth and that of the low-pass section must occur at important to the designer that the use of filters for general-purpose use, the only para- the higher frequency. If this basic design inductors is no longer necessary. This is meters of basic interest are the cut-off fre- criterion is forgotten, the resulting filter will be doubly attractive at lower frequencies, where quency and the steepness of the cut-off. This of the all-stop variety! the size of the inductor (both in value and in argument applies equally to low-pass and physical dimensions) becomes problematic. high-pass filters. SSTV This article provides a simple guide to the design of active Butterworth filters up to 8th Similar considerations apply here, but AREAS OF APPLICATION order, emphasising the building-block ap- whereas a RTTY signal consists of two very proach by cascading stages of first and sec- CONSIDER NOW SOME AREAS of interest narrow-band signals, the SSTV signal exists ond order, due consideration being given to within amateur radio where the use of low- over an 1100Hz band between sync bottoms the calculation of stage gain to achieve the frequency active filters is invaluable. Every- at 1200Hz and peak white at 2p00Hz. Be- required characteristics. one will doubtless have his own pet area in cause thts signal requires a bandwidth which is narrower that the 2400Hz receiver band- Sufficient detail is given in the text upon which filters could be useful or even vital, but which to base a simple computer programme. the areas chosen for illustration are Radio Teletype (RTTY), Slow-Scan Calculations can be performed easily on a hand calculator, but repetitive use of the Television (SSTV) and Morse (CW). same functions cries out for a programme to RTTY be written. I can vouch for the fact that the time spent in programme-writing is well worth- For amateur use, the recommended while, particularly for 'what if' investigations, tones are 1275Hz and 1445Hz, for a provided that they are not used as replace- shift frequency of 170Hz. The pass- ments for the thought process! band of the average amateur receiver extends from 300Hz to 2700Hz, so at least 1255Hz of receiver bandwidth FILTER CHARACTERISTICS above the upper tone and 975Hz be- Fig 1: Practical filters will differ from the ideal case. A SIMPLE FILTER HAS three descriptive low the lower tone are responsible for parameters. A pass-band is the region where passing unwanted signals and noise input frequencies pass through unaltered to to the terminal unit. Put another way, the output. A stop-band describes the region the receiver is producing and receiv- where input frequencies are prevented from ing noise over a bandwidth of 2400Hz, reaching the output. A cut-off frequency rep- only 170Hz of which contains wanted resents the boundary between the two bands. signal components. therefore, the An ideal low-pass filter response is shown in amount of noise being passed to the Fig 1. terminal unit is 2400/170 = 14 times The pass-band is on the low-frequency larger than it need be! These figures side of the cut-off, the stop-band being above are very approximate, because they it, In this case, the response is rectangular ignore the information bandwidth of and the identification of the cut-off frequency the RTTY signal, but serve to indicate is trivial. The response of a practical filter is the severity of the problem and the also shown on the same axes. Although ex- need for a good filter. hibiting the same general features as the As was mentioned earlier, an ideal ideal filter, it does differ in the following ways. rectangular filter function is impossi- ble to achieve, so the choice of steep- • The pass-band is not flat-topped. ness of cut-off becomes a matter of • The stop-band is not flat-bottomed. knowing what your RTTY terminal • The cut-off line is not vertical, but merges unit can tolerate in terms of out-of- into both the stop-band and pass-band. band interference. The equations pre- Fig 2: Band-pass filter made from low and high-pass filters.

62 RADIO COMMUNICATION June 1993 BUTTERWORTH FILTERS width, much of the available bandwidth is therefore contributing noise and unwanted GLOSSARY OF TER MS signals. (This argument applies to the trans- mission and reception of SSTV by single Asymptotic Polynomial sideband, as used on the HF bands, but not Imagine the curve y = 1/x. As x increases, A polynomial is an algebraic expression to the same extent when frequency modula- y decreases. As x approaches infinity, y containing more than one term. For exam- tion is used, as on VHF and UHF.) A band- approaches, but never reaches zero (the ple; pass filter is again needed to prevent these x axis). In such a case we say that y is x2 + 4x + 2 is a polynomial of order 2 extraneous signals reaching the SSTV de- asymptotic to the x axis. (the highest power of x). coder. Coefficient There are other areas within SSTV where Quadratic filtering is advisable, but often overlooked. An In an expression such as; example of this is the provision of an anti- (a) Equation. A quadratic equation is a Ax 3 + Bx 2 + Cx + D = aliasing filter. Aliasing is the name given to polynomial of order 2, eg; the production of jagged edges in a picture A, B and Care coefficients, ie constants x2 + 5x + 6 = which consists of discrete picture elements, which multiply the variable. or pixels. A typical SSTV picture consists of (b) Factor .The above equation can be 128 x 128 pixels, and any line which is not In-Band split into factors which, when multiplied exactly vertical or horizontal may be dis- This is a term used to describe a fre- together, are equal to the original expres- played with a jagged edge. An anti-aliasing quency (or frequencies) lying within the sion. filter is a low-pass filter designed to reduce pass-band of any filter, For a low-pass For example (x + 3) and (x + 2) are the this effect, and is placed in the transmitting filter, in-band frequencies lie below the factors of the previous equation, because equipment before the analogue-to-digital con- cut-off, and for a high-pass filter they lie verter (ADC). The explanation of this is out- above the cut-off. (x + 3)(x + 2) = x2 + 5x + 6 side the scope of this article, but the golden rule, whenever an ADC is used, is never to pass to it any signal frequencies higher than either aurally or automatically. The pass- half the sampling (clock) frequency. Whether band for CW depends to a great extent on the or not a particular system will benefit mark- performance of the automatic decoder or the edly from an anti-aliasing filter can be seen by preference of the human operator. Typically, defocusing the camera slightly. Most pictures frequencies over a range of 250 to 500 Hz Amateur Radio will show an improvement, and some will be cover most requirements. The steepness of enhanced enormously. the two cut-off frequencies is very important In the receiving system, a low-pass filter here, and cascading two high-order Butter- Techniques should be used after the digital-to analogue worth filters may not be the best solution. The converter (DAC). Most simple SSTV designs reader is referred to an excellent article by Pat Hawker, G3VA use a resistive DAC, and produce a fast-scan GOCKZ in Radcom (1). output resembling a chequer board. This is In concluding this section on typical appli- This long-awaited reprint of the classic 7th edition brings together a very large because the fast transitions between individ- cations of active filters, it must be stated that ual pixels are being faithfully passed by the the best filtering (in most cases) should take selection of circuit ideas and devices. slow- to- fast scan converter. A low-pass filter place in the receiver IF stages, and active information on antennas and reated designed with a cut-off at around half the filters of the type under discussion are in- topics, plus many constructional and fault- clock frequency will blur these transitions tended for those who find their receiver selec- finding hints, gathered during 22 years of without noticeably degrading the picture. tivity performance less than adequate, or who writing the Technical Topics feature. Low-pass filters having the correct charac- do not have any form of IF shift and width teristics can easily be incorporated into exist- controls. Members price: ing designs, and the experimenter will find little difficulty in evaluating the cut-off fre- REFERENCE £6.38 quencies required. 11] Active eliptic audio filter design using op- plus p&p amps, D H G Fritsch, GOCKZ, RadCom, CW Feb/Mar 1986 RSGB, Lambda House, Having got to this stage, there is little to say in Cranborne Road, Potters Bar, terms of the application of a good band-pass Herts. EN6 3JE filter to the decoding of CW transmissions, ... to be continued

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RADIO COMMUNICATION June 1993 63 WEATHER MONITORING Follow global weather by HF radio and satellite. View and record local weather conditions.

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64 RADIO COMMUNICATION June 1993 This year, the RSGB celebrates the Diamond Jubilee of the Society's most popular and enduring annual HF contest — National Field Day. HF NFD A Retrospective View

by Hilary Claytonsmith, G4JKS

N THE TWENTIES experi- Formative mental wireless association members would emerge Forties from the oppressive atmos- THE RSGB BULLETIN in 1947 phere of the towns and cit- reported "Experience gained in ies/ to enjoy their radio alfresco. the pre-war field days proved to A decade later, RSGB Presi- be invaluable to the many who dent Henry Bevan Swift, G2TI, were engaged in the recent hos- was promoting a more organised tilities. In the USA, New Zealand approach to field days, based on and other countries which have competition between the RSGB been hit by floods and earth- Districts. quakes the radio amateur has A germ of a scoring system always been quick to take advan- existed to encourage friendly ri- tage of such experiences". valry, but the primary objective Because of an increase in was to "prove that a group of membership, competition was portable stations, located in all now based on towns or areas. parts of the British Isles was ca- Groups were encouraged to im- pable of maintaining reliable com- prove the quality of their equip- munications with other amateur 1933 NFD winners, G6WN, operating from Denham, Bucks, In RSGB District 15 ment; any station receiving con- stations using low power appara- stant tone reports below T8 were tus. The event also would clearly cessful. The Post Office had just At that time, concern was be- disqualified. Stations still had to demonstrate that if the necessity closed down its station GKB at ing expressed by 'Clarry' G6CL, sign off with the band in use! arose, an emergency network of Northolt which had some rather over the transmission of harmon- stations could be placed into op- nice lattice masts - very conven- ics during NFD. "In at least one The 1947 NFD brought out eration at short notice". So was ient. However, the adjudicators case a 3.5MHz station claimed around 200 portable stations. born the first National Field Day said "Criticism has been levelled points for a contact with a 'B' Southgate Amateurs at G5FA/P in June 1933. against one district because they station operating on 7MHz and and G6ZO/P made 244 points Each district could run an 'A' suspended their aerial.... to the vice versa". and 339 respectively. Most station on 1.7 and 3.5MHz with mast of an old commercial sta- 1937 brought rule changes. groups using the classic VFO, buffer and PA setup with 264' the 'B' station operating on 7 and tion .... in doing so they unthink- Each district could operate four antennas, HROs predominated 14MHz [of course it was Mc/s in ingly placed themselves at an stations, the contest was short- those days, but we've used MHz advantage " The advantage ened to 24 hours and so that as receivers - state of art at the time. throughout this article to avoid being, they scored the highest everyone knew which band you confusion - Ed]. The input to the points of any station - 283 (34 were really on, transmissions had Petrol rationing was still in valve delivering powe r to the aerial OSOS). to be signed off with the band in place, and to avoid groups hav- was limited to 10W on 1.7, and ZL1AH (ex G3AH) tells of the use - ie 1.7 = 1, 7MHz = 7, etc. ing to transport bulky-large ca- 25W on the other bands. The 1936 Region 1 'B' station operat- At this time NFD was well es- pacity accumulators, the use of aerial was not to be higher than ing from Grants Tower Farm, tablished and the rules had set- dry batteries for HT and LT was 45' above ground and the whole Bury, where the rig was powered tled down. However, things were made compulsory. Judicious se- event took place over a 27 hour by a PE set which had a main not so settled elsewhere . . . lection of valves was now neces- period. bearing which ran hot. It had to be George Spencer, G2KI, recalls lubricated every few minutes with DATILULLL F11.10 DAY, 1934. being part of the 'A' station in an ether-based graphite com- si c . D OT It UST U Ul. District 15, along with Les and his pound. They took turns to do a brother Harold Wilkins, G6WN, stint of 'dripping' but unfortunately G2LA, G2IY and others, operat- as the ether evaporated off the ing from Denham Bucks, aided bearing it tended to anaesthetise by the boy scouts who provided the dripper. tents, dug trenches and cooked During the early days of NFD for them. The operators were dis- several unofficial stations joined tracted during the weekend by in the fun. Surrey Radio Contact activities at the Denham Studios Club was one such station, oper- ating from the top of the Croydon just below them, where 17 year NATIONAL ¡IUD DAT, 1936. old Margaret Lockwood was mak- Water Tower. Using a vertical $ C R DIST. 114. EASTERN. ing a film. This may have contrib- aerial dropped from the top, they uted to them only managing to were doing well until one of the make 81 points (30 (DSOs). How- helpers got the water and paraf- ever, the 'B' station with G6YK, fin cans mixed and made a large

G2BY, G5CV, G2UV and G6CJ pot of tea. It was a long way down CISL cards 1933-36. The letter P was added to the two-letter callsIgns to denote proved to be rather more suc- to the nearest toilet. portable.

RADIO COMMUNICATION June 1993 65 HF NFD

sary! The maximum power was 'A' station on 1.7 and 7MHz and reduced to 5W on all bands and the 'B' station on 3.5 and 14MHz. each station could only have one Separate log sheets came in for transmitter and two receivers - each band, greater scope of aeri- one to be used to search on other als was permitted, the start time bands. was put forward one hour, and In 1948, the Edgware and either one or two transmitters Hendon 'B' team was criticized could be used at each site. for its use of a two element rotary With NFDs come disasters. beam on 14MHz. However the Torrential rain did not deter the adjudicators decided they should Rochester group when the tent not be, as the modern trend was leaked. The operators were cov- towards such systems. ered with a plastic mac propped up by beer bottles. Another group Fluctuating put paraffin in the batteries in- stead of distilled water, and Fifties couldn't work out why they had shocking headaches. The Thames Valley ARTS 1971 station used a mix of commercial and home- THE FIFTIES PROVED to be a built equipment. By the seventies, operation from caravans was permitted. period of change, the only thing Around this time, much corre- spondence was received by the remaining fairly constant being spot cycle, record scores were G3ID/P. With modified KW2000s RSGB regarding the purpose of the names of Bristol and Graves- achieved; the 1.8 and 3.5MHz and commercial gear being used NFD. The following statement end in the lists of NFD Shield bands attracted extra points; scor- more often, station inspections was issued: "This event is not winners. ing rates at Stamford & District were introduced. regarded, nor has it been so for In 1950 aerials had to consist Group were averaging about 93 In 1964 Plymouth RC's Dart- many years, as a simulated emer- of single wire radiators, not larger points per hour in 1960. moor site became a 9" deep lake. gency exercise and no attempt is than 285 feet for the 'A' station 1960 winner, G3FUR/P, used The tent collapsed with half the made to shape the rules as though and 70 feet for the 'B' station a receiver with banks of crystal group inside, the top band aerial this were the case. It is firmly excluding non-radiating feeder came down, the generator sup- believed that the administrative, controlled converters feeding into systems. Only one receiver per a tunable IF strip at 1.5 - 2MHz. pressor then packed up resulting technical and operating experi- station was allowed. Then began The direct calibration could be in S9+40dB hash. In the middle ences gained in the planning, the first of a series of interesting read to 0.25kHz. The second IF of the night the mast snapped. designing and working of port- contest exchanges. Things then went smoothly - for able stations is of great value to was at 465kHz, and used a phas- 15 minutes until the generator the community. ing type crystal filter, half and full lattice filters, linear detector and cover caught fire. In 1957, the power increased CD multiplier. In all, it used 40 to 10W and six bands were made valves - 25 of which were in cir- available, including 21 and cuit at any one time! Striking 28MHz, to be split between the 'A' and 'B' stations. Equipment at V-Beams and cubical quads Seventies any station was not to exceed were becoming popular and the DURING THE DECADE some three transmitters and one re- word transistor was appearing fundamental changes took place ceiver. Towards the end of the more frequently in connection with in the rules. The sections were fifties amateurs were entering power supplies. By 1964 There changed in 1972 and again in '76 NFD using the names of their were fully transistorised transceiv- with the introduction of the Open Clubs or Affiliated Societies. ers, receivers, and DC to DC and Restricted Sections. Bonus converters. In 1966 the power points were available on 28MHz In 1951, Falkirk became the firs rule changed - "The valves ener- and 1.8MHz. With the increasing Scottish NFD Shield winner. The Steady gising the aerial shall have total use of commercial gear capable Sixties maximum rated anode dissipa- of 100W, full licence power was Operators had to send RST tion not exceeding 13.5W." allowed. plus time, when in contact with ALTHOUGH THINGS were The Frank Hoosen, G3YF 1978 was the worst year of the portable stations in 1950. By 1952 swinging elsewhere, NFDs in the Memorial Trophy (14MHz leader) decade for conditions, both radio it had changed to RST plus the 60s seemed quite sedate affairs. was received by the RSGB and and meteorological. A large solar first three letters of the operator's In spite of the declining sun- awarded to the Exeter Group, flare caused a radio blackout dur- surname. 1957 saw the emer- ing Friday followed by disturbed gence of the rising serial number. conditions with high levels of spo- In 1951 the Falkirk team car- radic E activity on 28MHz. On the ried the NFD Shield off to Scot- Saturday static levels built up land for the first time. To cel- causing problems on LF. Local- ebrate the event, the following ised thunderstorms wreaked year GM3HVC made the present havoc, with several stations be- Scottish NFD Trophy. Edinburgh, ing forced to close down. For Glasgow, and Dunfermline also those who continued there were appeared in the top twelve places. near misses - transceivers were Bristol began a three-year run damaged, ATUs were fused, at the top and in 1955 presented keyers malfunctioned and fingers the Society with the Bristol Tro- were burnt. The HFCC was horri- phy for the highest single station fied at the risks some groups entry. In 1952 they were using a were willing to take. Their advice 6L6 VFO, 807 PA/Doubler, half- at the time was "close down and wave dipole on each band, HRO take cover in a car; you may lose receiver with 132' long antenna an hour of operating but death is and 110v AC petrol generator. In so permanent!" The North Lon- the same year the sections were don CW Club reported "when changed. Each station could op- Cris, G4FAM, operating G3GRS/P in 1985, the third year that Gravesend took lightening struck nearby, we ran erate either as before or run an the trophy. Inspiration was drawn from the previous year's presentation photo. for our lives as the quad came

66 RADIO COMMUNICATION June 1993 HF NFD

down - with 60' high conductors 1930S NFD S HIELO WINNERS and the prevailing weather it was Winner more like a Hammer horror film Year District Area Points than NFD." 1933 15 W London & Middx 364 The Surrey Radio Contact Club 1934 5 Westem 361 became only the second group to 1935 8 Home Counties 427 win the NFD Shield three years 1936 12 North London 586 1937 16 South Eastern 517 running. This year also saw a 1938 Northern Ireland 612 unique event - not a cats whisker 1939 4 East Midlands 655 separated the Channel Contest Group and Glenrothes DARC as Year Winner Calls Points overall leaders resulting in the 1947 Southgate G5FA/P, G6ZO/P 583 shield being shared. 1948 Edgware & Hendon G3HT/P. G2IM/P 774 In 1979; three groups used 1949 East Motesey G6GB/P. G6N13/P 914 home brew transceivers but most 1950 Cheltenham G3LP/P, G5BM/P 847 1951 Falkirk GM4.10/P, GM4MF/P 931 chose FT101s over the TS820s. 1952 Bristol G2IK/P, G6GN/P 1123 Antennas in the open section 1953 Bristol G6GU/P, G6GN/P 1054 varied from yagis to rhombics on 1954 Bristol G2IK/P. G6FW/P 1091 HF and on 7MHz there were at G6BQ/P, G3IEW/P 1955 Gravesend 1186 least seven rotary beams. 1956 Bristol G2IK/P, G3RQ/P 1186 1957 Slough G6NA/P, G6CJ/P 1393 Mobile towers were being used more 1958 Gravesend RC G6VC/P, G3IEW/P 1651 Eighties and often by 1988 when this photograph 1959 Gravesend RC G6VC/P, G3IEW/P 1530 of Ayr ARC's NFD station was taken. 1960 Stamford & District G3ARS/P, G3FUR/P 2239 Nineties 1961 Stourbridge & OARS G3BMY. G8GF/P 1894 1962 Stourbridge & OARS G3BMY/P, G8GF/P 1908 COMPETITION SCORES, tem- TS930s as a CW contest rig. 1963 Port Talbot Group GW4CG/P, GW5VX/P 2276 peratures, winds, and antennas Tents were being used less of- 1964 KW Electronics RC G6VC/P, G8KW/P 2185 were all high during the eighties. ten, with a move to caravans, 1965 Cardiff Group GW5BI/P, GW4FW/P 2156 an average of 116 stations were campers, tow-a-vans and horse 1966 Exeter Group 0310/P, G3JW/P 2430 out portable with the points total boxes. 1967 Surrey RCC G3BFP/P, G6LX/P 2061 1968 Cannock Chase ARS G4CP/P. G3ABG/P 2334 breaking the 4000 mark. Tem- In 1983 down south, there were 1969 Guilford DRS G8GS/P, G3KMO/P 2375 peratures soared into the nine- thunderstorms, electrically 1970 Port Talbot GW4NZ/P, GW5VX/P 2336 ties, winds reached gale force charged rain and hail stones the 1971 SRCC G3BFP/P, G6LX/P 1984 10. The antennas in the open size of tennis balls, The electrical 1972 SRCC G3BFP/P. G6LX/P 2674 section were up at 65' and ranged discharges took a heavy toll of 1973 SRCC G3BFP/P, G6LX/P 2523 1974 Ariel AG G3BBC/P. G3GDT/P 2805 from rotary beams to yagis transceiver front ends, keyers, 1975 Channel CG G3MXJ/P, G4DAA/P 3329 through rhombics, sterbas and power meters, SWIR bridges and 1976 Glenrothes DARC GM3YOR/P 2577 stacked quads. It would have other solid state equipment. Hast- 1977 Channel CG GE4DANP 3356 been understandable if during the ings closed down for eight hours 1978 Channel CG G4DANP 3055 eighties large numbers of groups and the Channel Contest Group Glenrothes DARC GM4GRC/P 3055 gave up at 1400. A Sussex group 1979 Guernsey ARS GU3HFN/P 3346 had given up as stamina and en- 1980 Swansea ARS GW5ZUP 2933 durance were tested to the limits. found their tent on fire, while one 1981 Guernsey ARS GU3HFN/P 3423 Competition reached fever pitch check-logger singed his hair on 1982 Racal ARG 'B' G3KLH/P 3453 between the leaders but the lev- the feeder. 1984 brought flash 1983 Guernsey ARS GU3HFN/P 3620 eller turned out to be the weather. floods, lightning and gale force 1984 Gravesend RS G3GRS/P 3319 Most successful clubs have winds which brought antennas 1985 Gravesend RS G3GRS/P 3765 1986 3 A% CG GOAANP 4555 some formidable role models on and masts down. 1987 was the 1987 Verulam ARC G3VER/P 4476 which to base their operations. worst year of the decade with 1988 Marple CC G3VMW/P 4831 Gravesend is just one such club. gusts over 100mph showing how 1989 Marple CC G3VMW/P 4144 In the thirties G6BQ and G6VC vulnerable unguyed mobile tow- 1990 3A's CG GOAANP 4619 established a winning combina- ers were. Such was the resil- 1991 Reading DARC G3ULT/P 4698 1992 Reading DARC G3ULT/P 5279 tion with G3JLB, G3DCV and ience of NFD groups that 122 G3I EW continuing the success in stations were operational. the fifties. In the sixties G3MXJ and G3SXW came on the scene. Field Days are G4BUO and G4FAM formed the winning combination in 1984, 85 Fun and 86 when Gravesend topped WHY DO SO MANY people sub- the Open Section. ject themselves to this annual Southgate won the Frank ritual? What is the attraction of Hoosen Memorial Trophy in 1980, NFD? All I can say is, that as a 33 years after winning the NFD new girl of only 12 NFDs I have Shield and they're still going learnt a great deal about amateur strong. During the 70s and 80s radio from field days. dedicated groups emerged, add- I have learnt operating skills, to ing a higher level of competition. assemble and erect masts, put The Channel Contest Group, the together beams, cut dipoles, 3As and the Marple Contest maintain generators - all in tor- Group being among the more rential rain. I learnt how to use a notorious. With the competition great circle map, about grey-line came the emergence of on-site operation, long and short path computerised logging and dup- openings, sporadic E and trans- ing systems. Verulam ARC used equatorial propagation. I also dis- fully inter-reactive computers by covered who I could operate with, 1983. Later, programs such as and who I couldn't. But the great- NFD eighties-style. Computerised logging with band openings and scoring K1EA appeared on the scene. est lesson of all was that field rates on the wall of a tow-a-van. Operating G3VER/P are G3JKS and G3UJV. The FT101 was overtaken by the days are fun!

RADIO COMMUNICATION June 1993 67 Two Views of the SRW CobWebb A five band HF Antenna

The RadCom team was lucky enough to have the opportunity of trying out one of these antennas. At the same time Alan Carpenter, G3RQT, sent in his user review, so we decided to combine efforts as follows.

1: Alan P Carpenter, G3RQT

ATTENTION was drawn to this aerial by a local amateur who had recently purchased one. On our Sunday morning et he told me what he had worked and how it generally performed. Hav- ing a very small garden not suited to full size beams for HF. I decided to obtain one myself. A telephone call to Stephen Webb (G3TPW) of SRW produced several sheets of notes and information on the CobWebb. Some of the points raised in these notes were most interesting, as the specifications show. COB WEBB ON TEST ON THE AIR PARTS SUPPLIED. THE COBWEBB WAS secured to the top of BEARING IN MIND the height of the CobWebb THE INDIVIDUAL parts supplied are shown a 6ft pole. The tuning can be checked while was only 21 feet, (any higher and I was the aerial is at 611 above ground, and changes in the photograph opposite, before assembly. possibly in need of planning permission), the can be made by folding back the ends of the More than enough screws are supplied (40 following were worked: element for a particular band. Guidelines are required. 50 supplied!), and the same applies 20m numerous W's, ZS's. V01, VK's, 9K2, to the tags for the element corners. Purchas- given in the instructions as to how much CU, 9X5, TR8, ZL, HI8, FYO. Reports ranged ers even receive two pieces of tubing, pre. should be folded for a given frequency shift to from 5-3 to 5-9 plus 20dB. keep the antenna resonant. drilled, to practise screwing together before 17m ZL 5-1, W4 5-6;7, ZS5 5-8/9. Each band was checked in turn for reso- tackling the aerial itself! 15m 8P9 5-5 report, W's 5-5 to 5-6. nant frequency and was found to be initially All that is needed is a vertical support (pole) resonant at the lower end of the CW portion. 12m Only Europeans worked 5-7 to 5-9. and the feeder to the shack. It comes with a 10m VO1 5-5, and many Europeans. PL259 plug soldered to a short coax lead It was anticipated (correctly, as it turned out) These were worked during just one month which is connected to the feedbox. An inline that the resonant frequency would increase when the aerial was raised to it's final height in 1993 with only 100 watts output. Despite PL259 type connector is required to connect - in my case 21ft (6.5m). S.R.VV., I am told, will the rather spasmodic conditions during the the feeder to the CobWebb. supply an antenna pre-resonated at the OW month, it seemed a good spread of QS0s. end on request. After raising the CobWebb to Naturally a three-element beam at 40 feet will UNPACKING AND ASSEMBLY 21 feet, the resonant frequencies were again out-perform the CobWebb but listening to UK THE AERIAL KIT was supplied well packed in checked on each band and found to be as stations on 20m when conditions allowed and a generous covering of bubble wrap poly- follows: noting the signal reports they were giving out, thene. With the component parts laid out on there was an estimated 3-6 dB difference SWR Frequency the floor and sorted into various sizes, in- between their antennas and the CobWebb. struction sheets were read carefully and found 1.15:1 14.095MHz This was after allowing for power differences to be clear. No problems were found during 1.1:1 18.070MHz and their aerial heights. assembly, but it is recommended that this be 1.1:1 21.100MHz There was the occasion when the station 1,1:1 24.900MHz done on a flat surface. The sequence given in they were working could not even be heard, the instructions was followed before clamp- 1.1:1 28.400MHz but that UK station was using a six-element at a much greater height than the CobWebb! ing the spreaders to the baseplate. Raising the CobWebb to a reasonable Finally the wire elements were placed height would increase the resonant frequen- around the corner tags and the ends tied as cies slightly further, and some trimming might CONCLUSIONS shown in the photograph. Each band element be necessary. As I use digital modes more THE COBWEBB PERFORMED very well forms a square, with cable ties used to hold than SSB, the resonant frequencies shown and the short term results have been most the wires in place. above suit me fine. satisfying.

68 RADIO COMMUNICATION June 1993 COB WEBB REVIE W

DO-IT-YOURSELF RADIO the CobWebb is about 2.5 metres square and horizontal, this had to be placed about 1.5 MANUFACTURER'S THE ANTENNA WAS supplied with a PL259 metres lower down, due to the slope of the plug - an S0239 line socket would have been SPECIFICATIONS roof. more useful for most purchasers. as line a) Covers five HF bands. Typical 2:1 The effects of this were twofold: Firstly. the sockets are rather difficult to obtain. Assem- SWR bandwidths are 250kHz on bly was straightforward using a screwdriver, CobWebb was closer to the house mains 14MHz and 500kHz on 28MHz. 10mm spanner and pair of cutters. In fact. wiring and consequently the receive noise b) Omnidirectional - no rotator re- anyone with experience of Meccano and/or level was slightly higher. Secondly, the slight reduction in height may have resulted in mar- quired. MFI furniture should have no problems! The ginally lower signal levels on both transmit C) Horizontally polarized which vastly fibreglass construction means that the main and receive. reduces EMC problems compared structure is lightweight. Having said this, the The CobWebb is claimed to be omni-direc- to verticals. box containing the matching ferrite trans- formers is fairly heavy, and offset from the tional and tests with European stations cer- d) 5012 coaxial feed. centre of the structure. Therefore a well se- tainly confirmed this. For OSOs with stations e) Ferrite toroidal coaxial choke balun. cured mast is recommended for the antenna. to the east (eg Russia and Czech Republic), f) Feedbox and resonators all pre- It took about two hours from opening the reports were about one S-point down com- assembled. box, to final completion (excluding adjust- pared with the dipole in it's best direction. To the south, however (eg Malta and southern No tuning or resonating required. ments). This included one tea-break. g) Italy) the dipole is more-or-less 'end-on' and h) Full size half wave dipole perform- here the CobWebb performance equalled ance on each band. ELECTRICAL ADJUSTMENTS that of the dipole. For contacts at greater i) Fibre glass construction. No corro- PRIOR TO TRIMMING, some impedance distances (North and South America), the sion or metal fatigue problems. measurements were carried out. The fre- dipole seemed to have a definite edge. quencies which gave the best 5012 match l) Total assembly is pre-drilled. No were as follows: 13900. 18020. 20980. 24700 soldering required. CONCLUSIONS and 29500kHz. k) Size - 2.5 metres each side. IF YOU'RE LOOKING for a compact five- Small adjustments to the length of each band antenna, and can raise the CobWebb I) Weight - under 6kg (assembled). element were then made, and transmit tests even a few feet clear of surrounding objects. m) Fixes to a mast up to 2in diameter. carried out. After a couple of hours testing, at a reasonable height above ground, then Fixing clamps and plate supplied. optimum matching was obtained at the fol- the CobbWebb should give good results and lowing frequencies (the 1.7:1 SWR band- worldwide OSOs under the right conditions. width is shown in brackets): 14100 (90kHz), This could also be an excellent antenna for 18110 (100kHz), 21150 (120kHz), 24940 serious short wave listening. Raising it up to 40 feet will of course im- (130kHz) and 28450 (150kHz). It is important prove the reports and probably by two S- that any length adjustments are made to both The horizontal polarization is claimed to points. For a 0TH with a small garden and elements for any particular band. Otherwise, reduce the possibility of TVI, and certainly no where high aerials are prohibited this should it's possible to achieve resonance but incor- problems were experienced during an inten- fit the bill. Although the CobWebb has only 8 rect matching, or a 5012 match to a non- sive period of testing (yes, the TV antenna foot sides its resonant antenna. was also indoors!) performance is excellent. It represents very In fact the only disadvantage appears to be good value for money and I would like to thank RESULTS AND the bandwidth restriction, but this was not a the Directors of SRVV who have been most problem on 12m or 17m, or for either SSB helpful. OBSERVATIONS only or CW only operation in the relevant CONSIDERING THE SMALL size of the an- segments of the other bands. An ATU would tenna, good results were obtained on all five extend the tuning range, if required. 2: RadCom Team bands. Most tests were carried out on SEE REVIE W IN THIS ISSUE 20m as here the CobWebb could be ORKING DX WITH an in- compared with a 20m door antenna is not impossi- G3TPW `CobWebb' dipole used as a ref- ble, and the CobWebb was The best small antenna for 14, 18, 21, 24 & 28 MHz installed in the roof space of erence antenna. OMNIDIRECTIONAL. No 20-30dB nulls that normal horizontals a second floor apartment at Both antennas have. Talk to ALL the world, without having a rotator aboutW 35ft (11 metres) high. As it turned out to were fitted into the PURE HORIZONTAL POLARISATION. Vast reduction of EMC be a particularly rainy Sunday afternoon, one loft space, with the problems compared with verticals. Co-axial ferrite choke — no of the few advantages of an indoor antenna dipole just below the feeder radiation. 5 FULL SIZE ELEMENTS. No traps, stubs or loading coils, so soon became apparent! apex of the roof. As no losses. Full size dipole performance on all 5 bands. NO POWER LIMIT. No losses means nothing heats up (1kw tested). Ideal for ORP work, when you need a very low loss fie ORO) antenna' PROPER 5011 MATCH. No compromise. Double gamma tee match gives low SWR resonance on all 5 bands. PL259 plug fitted on short lead. SMALL SIZE & WEIGHT. Only 8 loot square (2.5 metres) and under 6kg. No need for tower or heavy mast. 'U' bolt fixing to 2in aluminium pole. NO PLANNING NEEDED. Generally OK if you fix mast to rear or side ol house and height does not extend above roof ridge FIBREGLASS CONSTRUCTION. No corrosion or metal fatigue. 100mph wind tested SIMPLE ASSEMBLY. All holes pre-drilled. All elements pre- cut. No pruning. MANY TESTIMONIALS. — Just ask anybody who has one! LOW PRICE. Still only £149 • £8 p&p (GB & NI) For more information call us direct SRW COMMUNICATIONS LTD Astrid House. The Green VISA Swinton, Mallon, N. Yorks Y017 OSY Tel Malton (0653) 697513

RADIO COMMUNICATION June 1993 69 Amateur Radio Communications Ltd FstabAiiisesCagailrUnti ltheagainst £ the Yen and the we are to expDec°tHianrg • 0°- 11Q 1\91 in crease on a HAN DS-FREE MAN UFACTU RE D BY continuous basis HE ATHERLITE MIC R OPHONES OUR CUSTOMERS TELL So now is the time to make that The only British Company producing microphones of note. Look for the US WE GIVE A "HEATHERLITE" label to make sure it's genuine. purchase. SERVICE THAT IS 1000/0 Hands-Free microphones for MOBILE rigs come complete with:- A flexible adaptable mic, control box. PTT switch. LED indicator, audio gain control, SATISFACTORY plugged for rig. Price £26.50. Two push-to-make scan switches cost an extra £3. We stock most items advertised in this magazine. So, for *Hands-Free microphones for mobile rigs which also require a 1750Hz tone competitive prices and a service guaranteed, find out for to be Issued from the mic come complete with:- Atone circuit in the control yourself and phone today. box lets a half second, 1750Hz tone be transmitted if required. This is preset but a fine adjustment trim is available to allow for tone acceptance deviation of repeaters in the UK and allows for adjustment requirements in Europe. The tone gain is adjustable. The switching of the PTT line and the tone control (bias action) is actuated by a professional make and break action with silver plated terminals offering high switching capability and long life operation (in excess of 100.000 operations). Mic with tone available at an extra £13.00. is now on show at ARC *Control boxes with sockets for the connection of your favourite The latest HF transceiver from ICO M microphone or microphone/earphone headset lo cater for varying needs complete with auto ATU, electronic keyer e.g tone facility, VOX extension facility, scan facility, In-built battery compartment. etc plugged for make and type of rig cost of £30.00. FOR PRICE plus many more features. *A waterproof switch cover for all our control boxes £1.80, * Velcro strip for easy control box placement cost 55p per set. * Foot switch for PTT operation available £19 extra. *Single lightweight earphone built into the mie cost £5 extra. * Medium weight earphone/mic set costs £10.00 extra. *POST AND PACKING £1.50.

Ring and speak to. ELAINE - SIMON - ANGELA - WENDY

HEATHERLITE MICR OPH O NES 75 St Catherines Drive, Leconfield, Nth Humberside H Y17 7NY - Telephone: 0964 550577

THE NEW

IS HERE This new HF mobile from Kenwood is going to be a big seller! The first one Oops was scooped up within an hour of arriving in our shop (must be a record!!). it's time to call SISKIN methinks! STOP PRESS... STOP PRESS ... Our last list of commission items proved to be a winner, whatever ¡terns remained after the 6 weeks between copy and publication date, were soon snapped up. We are getting around 15• now commission items in per week so phone us for your requirements, As of 27.4.93 the following equipment is available.. * FT-102 • FC- 102 . . £750 * R-2000... £350 * IC-R70 ... £395 * * FTV-707... £150 * ICS-FAX-1 £195 * 2 x IC-735's from .. £750 * * FRE-9600 HF Cony. ... £350 * IC-451E. .£425 * * Various BNOS linear *

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AUTHORISED DEALERS FOR: NOT ONLY ARE WE AN *YAESU*ICOM*KENWOOD*ALINCO AUTHORISED KEN WOOD DEALER. * REVCO * DRAE * STAR MASTERKEY* BUT ALSO. ONE OF THE OFFICIAL GWEN» WELZ *DATONG * ICS.* FAIRMATE* KENWOOD SERVICE CENTRES. YUPITERU * G WHIP * AOR A TONNA * Please send .54E. tor details o,, above or JAYBEAM* STANDARD *SANDPIPER* if brochures on new equipment required. Poor old RE Byrne is wondering where- to start with Digital BNOS * ASO * RE VEX * MFJ * ERA * Radio.., he should have phoned Siskin of course! Our latest INSTANT FINANCE AVAILABLE MAIL ORDERS RECEIVED Digital Radio catalogue has just rolled off the press and it's packed SUBJECT TO STATUS BEFORE 4 O'CLOCK Prices correct at time of going SAME DAY DESPATCH with up to the minute product news for Packet Radio. PacTOR, press. ESOE PROVIDING EX STOCK AMTOR, RTTY, Automatic CW, %vie( and FAX for just about any home computer available today. AMATEUR RADIO TEL: We are the official importer for PacCom m, BayCom & Svmek COMMUNICATIONS (0925) 229881 Packet Radio products and authorised dealers for Kantrímics, 38 Bridge Street, Earlestown. AEA & ICS. Our only business is Digital Radio so whether you are Newion-le-WIllows, FAX: just starting out or a seasoned 'Pro' debating whether to update Merseyside WA12 98A. (0925) 229882 why not give us a call today?

WE ARE Siskin Electronics M. Tel: 0703 2071551207587 1 MILE FROM J23, M6 and l i !O!O4*I 11,10171 M4PIT SUPPORT es".4..n, PC House, 2 South Street, atam to 8pm) 41/.2 MILES OFF J9, M52 -Itg Mt nee. may to gee II I If ythe, Southampton 504 612:B. Fax: 0703 84775.1 In3 reir

70 RADIO COMMUNICATION June 1993 Breakthrough on phone calls? Neighbours annoyed? ele4 The EMC Berkshire from IMIL ANEW-111—• 1%1 ascom will solve the problem! LYNCH Announces The Ne w FT-736RDX Early last year. MuTek were

commisioned — W e* tt 1r 1=f 1 tr 1St - • . ,- • l"."torragnaran • • by MARTIN LYNCH to _ improve the Specially designed to meet the stringent performance of the YAESU FT-736. After months of research and requirements of Fire, Police and Ambulance design, the increase in receiver performance is authorities, the EMC Berkshire has a staggering. The MuTek FRONT END operates on 2m breakthrough immunity of 50 dB*. It is one & 70cm bringing the receiver design into the of our range of popular business telephones nineties and ready for contest operation. made in the UK and is BABT approved. The four PCBs completely replace the original receiver sections and are mounted above the There is a three-year warranty, and a full existing boards. The P.A. boards are also replaced, in refund may be claimed within 28 days of order to reduce insertion loss on rx. receipt if the EMC Berkshire does not The S0239 solve your telephone breakthrough problem. Specification connector for 2m is replaced • BT radio interference tests, 50 kHz to 200 MHz Audible Original Spec Mutek breakthrough typically 50 dfl below normal speech levels with an N-type. 2m Section Noise Figure >18(.1B <2(1E3 Selectivity is To order, detach the coupon and send with your Image Reject. >60dB >70rIB also improved payment to: ltermod. free by use of an 8- Ascom Telecommunications Limited, dynamic range 80dB 90(16 pole xtal filter. Cypress Drive, St. Mellons, Cardiff, CF3 OEG. 70cm Section Available as an Noise Figure >18dB <1.5dB after-fit kit, asC0111 communications solutions Image Reject >60dB >70dB Itermod. free with full dynamic range 70dB 80dB instructions. £199.95 incl. Please supply 111 EMC Berkihire telephones at £9.95 each

VAT. (inclusive of VAT, post and packing) Colours: Grey Ej White Li Beige ji Total Cost = A fitting service is available at an additional £59.00 Payment by Cheque/AccessNisa (collection & delivery extra). 'Please make cheque payable to Ascom Telecommunications Limited. Card No: new F1736RDX is available from stock at only £1995.00. Expiry Date . Name

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RADIO COMMUNICATION June 1993 71 NB: STILL THE LOWEST COST HF 'COMMUNICATIONS' RECEIVER AVAILABLE! r DATONG MR))) ELECTRONICS LIMITED

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APPROVED - COVERS TOP BAND TO TEN • 'me>, senates, Icrarnoribe tc. ?VI ¡at ooctosi • Oroobarqcoveregelbebe2001./ to eve 30».i.r) - SSB/CW/AM - FM STEREO A JOY! • meth ro much.; or otter odpscrnente II two...rpm.% AD270 «wow rnarr...% aD370 IdLeuratedi hr• Mdcaeue • ',cry c.nna. Ceds 3 metro. oared length SEE REVIEW • proPesacnel mice/name standonit • tertnerAde rnenrecgomerunt JUNE '92 `RADCO M7 A0270 £50.05 AD370 £75.91 MORSE TUTOR SPECIFICATIONS & FEATURES thourvelveNcemmoitoàoiercreNeworarnartarma * 159.26.999 continuous tuning with no gaps. Phase locked loop•double conversion Supernel- Maw Co* crolorral. electounnis pro...en by etotlyne * Full Shone ave/AMISSH 1511.2999%.11, No Gapt! 4 KM it7.5 - 10K Mono/Siens- * thomends powers «cold vole • A-ecta. ATM...v. meow ot vow comens-lee Five Tuning Functions: Direct Pre, Button Erequerwy Input Auto Scanning. Manual Seaton , .• • Ginn« arinizen Airtime pie ect Worse dr• Memory Recall and Manual ruing Knob * Built-in (lod. and Alarm. Radio turns on awn, choricteromun tall) at preset time and frequency. * large digital frequent-y display. * Founeen Memort••• la 070S uncue "DELAY" corweciallave pu Awn mil Nine memory channels kir you, favourite station frequencies. Lasi setting of mode and easel, chancier *el ts con = hop gpme sard Suet eel stored in 5 memories. * Ulu Oeley between own &roe« »vat «M.. ream the May TeMpeedenUmeeCh pies, button A • • o all ch.A$4,4 wers remora asset an 0.e ortvenArt Shinewavelostarkaw hands.* SPEED" cared in WWI VILU M -battery Of AC oxalis • ron.,.. tog We Maw, ocer,.A.:crnpect .Idaptin. *General coverage of all • ladeceate- dr.emea ...nu. hands in LW/M W/SW (Dedi- (64 95 cated Broadeass Band Coverage on Our MI catalogue pl ue further detade of eny t ersionst Plies)! courte the tin. product ere ay. table I ree en request. Dealer.,r1 hand tor quality sound broadcasts meet countrm. .und fee lilt. in headphone stereo. * SLEEP Credit card. accepted. Coed • nor y deem-U. Sed mt. h.n 3 days Function turns the radio on or Ott eub¡ect in arse s. All price. include V A.T after an adjustable tinte uf 10,20 minutes. * Scpanue BASS and TFtEBLE controls (or maximum listening pleasure. * External an. Datong Electronics United, Deonevner. Jr...Dayton Wood Close. Votst Pork, LEEDS, LS)6 60E tom. jask tor better reception. * Adjustable r t GAIN control to inrsent overhudinp Iis 10532I74482212iintsti) listening clew mother strong mat In nt or il there is interference.* New improved wide/narrow filter 16/23111, )* Ina. control (Beat Frequent, Oscillator) enables reception of SSIIIIISB/ ISO (single side band) and cat. Mont (ode) traitunissiont.* Illuminated display to facilitate night-time ow. * Designed for bosh penable and Desk Top use. * Five dot LED Signal Strength Indicator. DIMENSIONS: 29.2 m x 16.1km (1 I.5M x 6.3in 2.36in) OlITP IT, 1200m W ( Ti ll)) IT: I .7két 13.751twil Without batteries.

+ £5 check, test and Is& l' Also, suitable mains unit FORT WILLIAM, HEAD RD. ONLY £119,95 available only £9.95 DOUGLAS. ISLE OF MAN. S.E.M. 'PHONE 0624 662131 SKY SCAN Desk Top Antenna I> S.E.M. O.R.M. EUMINATOR MKII. This device can •,:nase out Model Desk 1300 completely local Interference cl any kind. Connects In your aerial feeder and covers 100 KHz to 60 MHz, you can transmit through it, UU111 and designed for use with scanners. £98.50 incl. Ex-stock Coverage: 25 to 1300MIlz Tina) height - V.H.F. 0.11.M. ELIMINATOR 130-180 MHz, £119.50. 36ins - 9ins at widest point. Comes complete HI 0 RECEIVER AERIAL MATCHING UNIT. Provides a high with 4 metres of 12(358 coax cable and BNC selectivity Impedance match for wire or co-ax aerials to your receiver connector fitted. Ideal indoor - high perfor- £66.50 Oct.i Ex-stock. mance antenna and can also be used as a car S.E.M. TRANZMATCH MKIII. The only Aerial Matcher with UNBAL- antenna when your car is static. ANCED and TRUE BALANCED OUTPUTS. IkW 1.8-30 MHz. £165.00 Built-in EZITUNE (see below), £55. Built in Dummy Load, £10.90. £49.00 + £3.00 p&p EZITUNE. Allows you to TUNE UP on receive instead of transmit. FANTASTIC CONVENIENCE. Slops ORM. Boxed unit. £59.50 P.C.B. and fitting instructions to fit In any ATU, £55.00. FREQUENCY CONVERTERS. V.H.F. lo H.F. gives you 118 to 146 4 SKY SCAN V1300 Antenna MHz on your H.F. receiver, Tune fix, 2-30 MHz, £77 ex stock. Most disconcs only have horizontal elements H.F. to V.H.F. gives you 100 kHz to 80 MHz on your V.H.F. Scanner. and this is the reason that they arc not ideal £66.50 ex stock. Plug In aerial lead of any receiver. Tuning born 100 if for use with it scanner. Most of the transmis- Ml-Ii up. sions that you are likely to receive on your 2 or 6-METRE TRANSMATCH. I kW, will match anything, G2DYM or arc transmitted from vertically G5RV? on VHF. £55.00 ex stock. DUMMY LOAD. 100W THROUGH/LOAD switch, £38.00 ex stock mounted antennas. The Sky Scan V1300 has VERY WIDE BAND PRE-AMPLIFIERS. 3-500 MHz. Excellent perfor- both vertical and horizontal elements for mance. 1.5dB Noise figure. Bomb prool overload figures. £45.00 or maximum reception. straight through when OFF. £55.00 ox stock. £49.95 + £3.00 p&p R.F. NOISE BRIDGE. 1-.170 MHz. Very useful for aerial work measures resonant freq and impedance. £.59.50 ex stock. COSMIC MEMORY KEYER. The most comprehensive hoyar available, SKY SCAN Magmount MkIl 4 x 48 character memory messages which can be combined or call For improved performance, wide band reception, 25 to each other and contain operational commands. Many more facilities all being called or interrogated via the keyl £117.90 inc. 1300MHz. Conies complete with protective rubber base, IAMBIC MORSE MEYER. 8-50 w.p.m. auto squeeze keyer. Ex stock. 4m RG.58 coax cable and BNC connector. Ours is the easiest to use. £59.50. First class twin paddle key. £35.00 Built and designed for use with scanners ex stock. TWO-METRE LINEAR/PRE-AMP. Sentinel 40: 14x power gain, e.g. £24.95 + £3.00 p&p 3W - 40W (ideal FT290 and Handholds), £125.00. Sentinel 60: 6x power. e.g. 10 W in, 80 W out, £135.00; 10w in, 103 W out. £165. H.F. ABSORPTION WAVEMETER. 1.5-30 MHz, £55.00 ex stock. MULTIFILTER. The most versatile audio litter. BANDPASS Hi Pass, Lo Pass and two notches. £95.00 ex stock. S.R.P. TRADING HIGH PASS FILTER/BRAID BREAKER. Cures T.V.I. £8.85 ex stock. CO-AX SWITCH. Three-way • earth position. D.C.-150 MHz, 1 kW. Manufacturers and distributors of communications equipment £39.50 ex stock. Unit 20, Nash Works, Forge Lane, Belbroughton, 12 MONTHS COMPLETE GUARANTEE INCLUDING TRANSISTORS Prices include VAT and delivery. C,W.O. or phono your CREDIT Nr Stourbridge, Worcestershire. CARD NO. Ring or write lor bather data or catalogue. Orders or Telephone: (0562) 730672 Fax: (0562) 731002 inlormation requests can 1,0 put on our Ansaphonce at cheap rate limes SHOW ROOM OPENING TIMES: Mon-Fri : 9.00-5.30pm Sat: 9.00-1.00pm Callers Welcome.

72 RADIO COMMUNICATION June 1993 signal go further, it just makes the signal Electronics sent me a prototype to try on the stronger. The trick is to use just enough band and offer advice and comments. I found power to allow it to be usefully copied in the the transceiver performed well on 40 metres place you want to contact. and I enjoyed a good range of contacts all "Excessive power is actually worse than around Europe over a few nights of operating. QRP waste: It is potential interference." Additional The transceiver is another example of the power just lets you be heard further beyond QRP equipment based around the NE602 oscillator/mixer chip. An NE602 mixer can be REV GEORGE DOBBS G3RJV the station you are trying to reach. That is St. Afdan's Vtcarago, 498 Manchester Road, interference to other stations on the band. It a little 'iffy' as the front end mixer in a 40 metre Rochdale OL I 1 3HE can disallow successful frequency re-use receiver, but Hands appear to have done their where it might otherwise be possible: stations design homework well on the input bandpass sufficiently remote from your target area wish- filter. The example I tried coped very well with ing to use the same frequency. evening conditions on the band. My prototype THE AUSTRALIAN QRP CLUB has enjoyed The authors go on to suggest practical proved to be a very lively and viable little a revival in recent years and is now an active ways of using power wisely including receiver transceiver and pleasant in that it could club with international membership. It's aims selectivity, signal processing and directional achieve my desired 5W output level with are simple and summed up in one sentence, antennae. It also suggests that the use of power to spare. "Promoting Low Power CW Mode Communi- greater power is no substitute for correctly The TCV/7 kit sells for £85 complete with cation and Home-brewing in the Amateur adjusted transmitters and receivers. Well VFO and everything, except the case and Radio Service". Their motto is "We do more worth reading, the article skilfully links the hardware. The main board, less VFO, is with less". The club produces an interesting ethical and technical sense of power man- available for £69, which would enable an journal, Lo-Key, which is a mixture of news, agement. The same issue of QST has a existing VFO, or the Cirkit VFO, to be used, activities and construction projects. Lo-Key practical article on Automatic RF Power Con- perhaps for another band. Versions will soon has gone from strength to strength under its trol for AMTOR Operation. be available on other bands and some of these versions would be attractive as a Nov- lively editor, Don Callow, VK5AIL. The club Not content with two major articles on ice transceiver if set to give the required 3W also has a scheme of awards and activity power management, OSTfeatures QRP in its RF output. The kit, or details, can be obtained events using 5W, or less, on CW. editorial by David Sumner, K1ZZ. He sug- from Hands Electronics, Tegryn, Llanfyrnach, Membership is open to any radio amateur, gests that ()RP operating is a speciality that Dyfed SA35 OBL. Telephone: 0239 77427. with an annual fee of $A10 for VK members, offers some lessons to all of us. My favourite $Al2 for ZL members and SA14 for DX mem- bit is, "Home construction is popular with this PLEASE ORS! bers. Applications for membership, or enquir- group, and those with the talent to milk high ies, can be made to Kevin Zietz, VK5AKZ, 41 performance from simple equipment are highly MOST EXPERIENCED CW operators seem Tobruk Ave, St Marys, SA 5042, Australia, regarded by their peers; they're the gurus of to quickly forget what it was like when they what might be termed low-impact hamming'. first used their key 'in anger' on the bands. I RF POWER: HOW MUCH IS One of my favourite operating periods of the have had a recent reminder of the horrors and ENOUGH? year is between Christmas and New Year's frustrations of the new CW operatoron the HF Day, when QRPers make a point of getting on bands. After many years of holding a Class B ... APPEARS AS THE cover article in the the air to exchange greetings - not as a Licence (G1IJW), my wife has just become March 1993 edition of QST, the official journal contest, but in celebration." He must mean GOOWH. Her first log page on the HF bands of the ARRL. An odd title to head the official the G QRP Club Winter Sports - thank you puts my first page to shame. The first OSO magazine of the hobby in the country that is David, we like it too! was working me on a very crowded 7MHz so often identified with the big power stations band the evening she received the callsign: I of amateur radio. I doubt if many people in the was in Birmingham visiting G4L0F and her UK know, I didn't, that the FCC (Federal A NEW QRP TRANSCEIVER 4th log entry is working me again, this time on Communications Commission) rules state that KIT 21MHz when I was signing G3RJVAN8. It "an amateur radio station must use the mini- A MORE RECENT NAME in the UK amateur took me 3 years to work my first American mum power necessary to carry out the de- radio kit market is Hands Electronics of station, in fact it took me 2 years to get off Top sired communications". The article, written Llanfyrnach. They issue an interesting free Band! Standing over her shoulder, offering by Diehal Martin, N5AQ, and David Newkirk, catalogue and amongst the current list of advice, I soon began to understand the prob- WJ1Z, is worth reading by radio amateurs products is a new QRP Transceiver kit. The lems of a new CW operator in the 1990's. The anywhere. It is long and informative but I TCV/7 Transceiver Kit is a VFO controlled HF bands are full of stations badly paddling would like to pull out two simple statements. 7MHz CW transceiver capable of up to 7W of electronic keyers at a speed just in excess of "How far your signal travels has nothing to RF output. The transceiver includes an RIT what they can manage to send with accuracy. do with how much power you run." As long as and has a pi-pad on the board to control the Spraying extra dots around the bands is not a you run a power greaterthan zero, your signal output to lower levels for the officia/QRP level good way to show skill! There are, of course, will travel everywhere propagation allows it to of 5W or less. many good readable operators around. "Don't travel. Increasing power does not make the Before this kit came to production Hands be daunted", I said, "call a station that is sending easy to read CW and send 'PSE ORS' during your first over". Either they do not understand this particular Q Code group or they consider its implication to be difficult because almost none of the stations will com- ply. This may well explain why so many Class A operators pass the Morse Test and then quickly give up CW operating on the air. Shortly we are to have an influx of new Novice Licence holders, keen but inexperienced, who will be seeking our help on the air. Please remember that when you hear these strange new callsigns or a new GO callsign on the air if, and how, you respond to them will deter- mine the future of our hobby. Wire up a straight key in parallel to your bug, you are going to need it .... if you can use it! Please The new Hands Electronics TCV/7 for 40 metres QRS or else we may lose new blood in See 'A New QRP Transceiver Kit'. amateur radio.

RADIO COMMUNICATION June 1993 73 Upnor, Rochester in Kent (tel: 0634 712699). through, especially if it is only present on the He says that he has had no problems with HF, local telephone and not on the line itself, so VHF or UHF. Gerald said that he would have the computer does not register a fault and the no hesitation in recommending them to oth- enquiry is 'cleared'. The neighbour, of course, ers from the RF point of view. then complains to the amateur that it must be The company manufactures several PIRs • their fault as BT said the line was OK! Poor for different uses as well as other compo- G8BQX "had four different people moaning at nents for alarm systems such as power sup- me" so he decided to write to BT Customer MEGAN SMITH, GOMEG plies etc. Unfortunately G4ZMH didn't say Services to ask fora maintenance engineer to EMC Committee Secretary which model he used, so I am unable to pass arrange tests. on the exact details. After eight days he telephoned as he had Our EMC Chairman Bob Peace, G8SOZ, heard nothing, and it took BT several hours to (or Chair, as I like to call him) has had to take find his letter. They eventually rang and prom- I HAVE HAD LOTS of letters this month, a back seat for a while for family reasons, and ised to send an engineer for tests. G8BQX thanks for all your comments. Top of the list Vice-Chairman Robin Page-Jones, G3JWI, writes "From that moment, things went like are the old favourites - televisions, telephones has taken over the Chair until the election in clockwork! The very next day the engineer and alarm systems. A couple of intrepid folk June (this month). This does serve to empha- phoned me, I beamed at one of the affected sought me out on top of a damp, cold hilltop sise that all EMC Committee members, cor- addresses, and, once he persuaded the per- during a 2 metre contest earlier this year to responding members and coordinators are son to switch off their TV, Hi-Fi and computer deliver the letters personally. Serves me right volunteers who give up a substantial amount which were also receiving my transmissions, for advertising my presence with 400W into 2 of their own time for the hobby. Anyway I am he heard the breakthrough, swapped the x 17 ele Tonnas courtesy of the Eleventh sure that readers will join me in thanking Bob horrible Tribune for a Vanguard, and all was Hour Contest Group! I hope everyone en- for all his work during the three years he has well as regards the telephone." joyed RSGB'93 at the NEC, my June column been in the Chair. Over the next few days the others were deadline was before the exhibition so I will also successfully dealt with by BT exchang- He has been researching car alarms re- have to write about it in August RadCom. ing phones for models with better RF immu- cently and has sent me details of the new nity or by telling the owners of other types 'Vecta' key system. The manufacturers have politely that they should contact their sup- BURGLAR ALARMS TURN given him some test results for us to publish plier. So a belated bouquet was due after all! THE TABLES to show the level of RF immunity for the Robin Page-Jones, passed on a letter from MY USUAL PROBLEMS WITH burglar alarrns system. With a test Vecta system fitted in a newly licensed GOTCE about telephones and are those associated with amateurs acciden- car the immunity figures were as follows: RF immunity. He works for a company which tally setting them off while transmitting. This 10MHz to 80MHz, not less than 50 volts/ makes special telephones and communica- time the situation is reversed and the subject metre modulated 99% with a 1kHz square tions products and has developed a telephone is RF emissions from an alarm system. Shaun, wave. Similar results were achieved with fre- "with a large degree of RF immunity" called G8VPG, wrote to me from Bristol. He wears quencies 30MHz to 200MHz and 200MHz to the EMC Berkshire (pictured). Two radio ama- many 'hats' as he is the RLO for Avon as well 1GHz. With an antenna mounted on the boot teurs have used them successfully to replace as an EMC Coordinator for the area. A local of a car and RF radiation not less than 100W troublesome instruments in their own or neigh- amateur has recently had installed a cordless (modulated 99% with a square wave at 1kHz bours homes. GOTCE didn't give any techni- burglar/smoke alarm, the ATI 6000 by Ad- and frequencies swept from 20 to 200MHz) cal details for the telephones but anyone vanced Technology Industries of Bristol. there was no malfunction of the security sys- tem. This sounds as if it could stand up to the interested can contact Ascom Telecommuni- Apparently this works on 172.225MHz but cations Ltd of Cypress Drive, St Mellions, his particular one appears to emit 'sproggies' most ambitious mobile transmissions. Cardiff on 0222-777800. at 50kHz intervals throughout the two metre One of the brave (mad?) souls who ven- band which are audible on a hand-held up to HOT-LINES! tured up to our contest hill site was Harry, 20 metres away from his house. The amateur I HAVE QUITE A COLLECTION of items on G3SBV, who is an 80 metre fan. He had is dealing with the company direct to resolve telephones. All of them could have fitted received a visit from the Radio Investigation the matter, but Shaun was interested if any nicely into the 'Bouquets and Brownie points' Service of the RA following complaints of readers had come across anything similar. paragraph so it is all good news for a change. breakthrough. One of the items affected was I wasn't sure about the following at first though! the neighbour's telephone. He rang RSGB BOUQUETS AND BRO WNIE G8BQX wrote about his experiences with 2 Headquarters to see if they could offer advice POINTS metre SSB breakthrough to various neigh- and they put him on to EMC Committee STILL ON THE SUBJECT of alarms, it is nice bours' telephones in the Hastings Electronics Member Hilary Claytonsmith, G4JKS. Hilary to know that some companies are getting it and Radio Club newsletter Vital Spark some suggested that it would be worth-while trying right. Gerald, G4ZMH, wrote from Lincoln to time ago. Apparently the automated remote the plug-in Freelance RFI Filter available say that he has been using one of the G- testing equipment used by the BT 151 fault from BT retail shops. Harry tried one on his TRON PIRs from Glazertron Ltd of Lower reception clerks is unlikely to detect break- own telephone and found it cleared the break-

fttOtOGliA..1 ASC0.411...SLEA LTD

The EMC Berkshire from Ascom Telecommunications Ltd Is designed to have Seventy centimetre band-stop filter built by G8MNY In a box made from a cat- "a high degree of RF Immunity". See 'Hot-Lines!' food tin lid! See 'Junk Box Filter'.

74 RADIO COMMUNICATION June 1993 EMC through, but unfortunately, his neighbour re- from the DTI How to Improve Television and design which John had published in BATC's fused his offer .of afilter. Harry also mentioned Radio Reception useful in explaining what he CQTV Volume 160, the details of which are the filters to Steve, G3UFY, who has used wanted to do. (Unfortunately this is not pub- given below. The filter was tuned up using them successfully to sort out two more tel- lished any more.) test gear and gave some 30dB rejection, but ephones. Although the cost is around £10 per In fact you shouldn't really touch anyone needed a final tweak after fitting in position to filter, they have the advantage of being fully else's equipment, as you are likely to be null out the unwanted signal satisfactorily. approved equipment for fitting to telephone blamed for anything which goes wrong even The neighbour was very pleased with the lines. I hope to be able to include some if it is nothing to do with you. You should try outcome, especially as the service was free, technical details on some of the equipment and explain what is required so that the owner from the not so local Caterham Radio Group, mentioned in a future column as GOSNO has can arrange for the appropriate filter to be but G8MNY didn't think they would have been volunteered to do some tests. fitted by the service engineer. However, if quite so happy to pay for professional engi- Another issue which Harry has highlighted they decide to let you do it, as it is more neers' time. indirectly is the shortage of EMC coordinators convenient, then obviously it is up to them. in the South East of England. Strictly he This is probably the hardest part of the prob- G8MNY'S JUNK BOX 70CM should have phoned his local coordinator lem, as finding out who to contact for different TVI FILTER first, and then possibly the EMC Hot-line parts of a system in a block of flats can be like THIS IS THE DESIGN on which the filter used answering machine if there was no coordina- unrolling a ball of string after a kitten has at High Wycombe was based. It originally tor, rather than RSGB HQ. The local coordi- played with it! It also shows how important appeared in the BATC magazine CQTV. nators can be found in the RSGB Call Book, maintaining good relations with your neigh- and from time to time a list is published in bours can be when dealing with EMC prob- Parts: RadCom [see June '92, page 59 - Ed ]. lems which require their cooperation to solve. • Tin plate (cat food lid, steel soft drink can So, if you feel that you can contribute to the The other matter which GORKF raised was etc!) that if the block of flats had had an FM hobby by advising on EMC problems please • Belling Lee TV plug let the Committee know. broadcast receiving aerial in parallel with the • Belling Lee Chassis TV socket (metal TV aerial, the distribution amplifier might have type) WATCHING NEIGHBOURS been used to boost signals in the 88 to 108MHz range. A high pass filter with a cut-off fre- • 8 inches 75 ohm TV coax ONE OF THE WORST PLACES for a radio quency of approximately 75MHz would have • 2 'polo mint' size ferrite cores amateur to live must be in a block of flats. I been needed for the system. • 2" 22SWG silver/enamel copper wire never cease to be amazed by the ingenuity of • 2-10pF trimmer capacitor people fixing up 'invisible' antennas, hanging CATS HELP WITH TVI long wires out of windows via balloons etc. In • paint or plastic tape (to make it present- many cases the enforced QRP operating ANOTHER SUCCESSFUL TALE of calming able) turns every contact into an adventure. How- a TVI problem was brought to my attention by • glue, solder ever, the EMC traps for the flat-dwelling op- John, G8MNY. He is a keen amateur TV erator are many, and one of the usual ones is operator, an enthusiastic participant in field CONSTRUCTION NOTES: the communal TV aerial system. days and contests and enjoys building or 1. Cut tin plate into a cross shape (with tabs Phil, GORKF, has written with a tale illus- modifying equipment on all bands up to mi- to solder up) so that it can be folded up into trating that a methodical approach and being crowave. He was asked to help with a case of a box 1" x 1" x 0.5". on good terms with your neighbours pays TVI in High Wycombe where the neighbour WARNING SHARP EDGES! (You could dividends. As you can gather from the forego- said that a satellite TV system was suffering experiment with a paper shape first). from the effects of nearby (50 yards away) ing, Phil lives in a block of flats. He installed a 2. Drill and mount the socket on one of the packet radio nodes on 432 and 70M Hz. These W3DZZ trapped dipole and discovered from 0.5" sides. neighbours that he was wiping out their TV nodes were temporarily shut down out of courtesy until an amateur testing team could 3. Connect plug onto coax and feed the two pictures. Further enquiries revealed that he ferrite rings on the coax. was affecting every TV in the block! He ar- visit. 4. Cut a hole for the coax in corner of box, ranged some tests with his near neighbours and solder in, then connect the core to the to establish whether his signal was entering socket centre. the mains electricity supply, onto the TV coaxial downlead or into the TV distribution 5. Wind the wire into coil three turns approx amplifier itself. 0.25" diameter and solder to socket cen- A set-top aerial was tried on one television tre. and full power test transmissions made on all 6. Make tuning hole, and mount trimmer bands. No interference was noted, ruling out from coil to ground (shaft earthed). direct breakthrough or RF getting into the 7. Fold up box, tack solder a few tabs tempo- mains. This left either the individual downleads rarily. to each flat (which would have required twenty B. Connect to an aerial (50 ohms does not one high pass filters to be made or bought) or matter too much) and 70cm receiver and the input to the distribution amplifier. Phil null out a signal. wrote, "Human nature being as it is I decided 9. If all OK, solder up properly, glue coax to try the cheaper option first and fitted a high firmly in place, fix rings light to plug and pass filter to the input of the TV distribution box. Heat glue is useful for this. amplifier. Further tests proved that the prob- When they arrived, they found the source 10. Paint and label '432MHz Trap G lem was now cured and no more complaints of the problem was the 6W 432MHz signal were received." Phil already had a suitable swamping the neighbour's distribution ampli- 11.Re-tune for best dip and cover up trimmer filter left over from his CB operating days, a fier, which had been placed after two satellite hole. commercially made unit which cost around receiving systems on the UHF loop. They had G8MNY said that he had measured 30dB £6.50, but a homebrew one could have done not been expecting a normal broadcast aerial rejection on the best one, with only about the trick. • system as well and so had to make a simple 1.5dB insertion loss (550MHz). He added Very wisely, GORKF pointed out that al- 'suck-out' filter for 70cm on the spot. It was that in strong signal areas, an attenuator can though the fitting of the filter was a relatively made from two turns of wire and a 2-10pF be all that is needed. Improved interference simple modification to the communal TV sys- variable capacitor mounted in a box made performance is obtained if an attenuator (3- tem, it is vital that anyone contemplating a from a cat food tin lid (at least the cat must 6dB) is included in the box and the suck-out similar situation must contact the mainte- have enjoyed the afternoon if it had to eat an connected across the middle 'T' section. This nance company/committee for the flats and extra dinner to provide the lid!) and covered is because any bad SWR of the aerial system get permission first. He found the old booklet neatly with plastic tape. This was based on a will not then de-tune the filter.

RADIO COMMUNICATION June 1993 75 Roger Ballister, G3KMA, gives an update on one of the RSGB's most prestigious Awards Islands on the Air Award

HE IOTA programme consists of 18 sepa- SVVL Listing Honour Roll - May 1993 FORM 703 1K 1G PG 639 Cl AN N 556 0601 458 May 1993 112L 702 0 5141 633 02034115 550 00621.1 453 VE3XN 691 G4RFI/ be claimed by any li- Simpsomla. DEOMSI 679 633 OL7CW 548 W3011 453 18YRK Fl 54,al. BPS 8841 .. 547 686 110.1-10 630 G3A4LX 547 737XJ 442 censed radio amateur Il HYW 684 C Get., ORS 47426 514 DK IRV 629 0378.8 544 ItTBE 437 038.80 679 F6AJA 628 G3TOK (whoT in the UK is a member of the 1.1 Ruego. DL-9286 . 501 543 N3CWP 431 K Corson. t270.6437 482 I ISNW 676 DK6NP 627 0E3WW13 543 12 VOX 426 98.28.8 675 t2LIWZ 12f UG RSGB) who can produce evi- G Seucs WO-20276 340 623 539 001JKM 425 G1.131TN 674 982TW 62' 0C1JPG 537 J Holleman. WOX3JF21 330 VEGPW 420 dence of contact on the HF bands VE 71G 674 ON4AAC Geoff Watts, BPS 3129 225 620 14139BVV 532 IKIAOD 420 W9DC 674 OZ4RT FOND - with the required number of sta- B Egio11. SVDX21 AU 223 620 530 1109C2W 416 2090550 674 FE6CYV 612 W9NIM 527 IK8JWA 415 tions located on islands around H Wmarnaos. DL-20064 222 Bun. E6982, G '69 ON5KL 673 ON4X1 611 G3VJP 521 EA4KK 410 W4BA.A 671 F6AXP the world. Many of the islands are C Hodos. 0M3-28013 142 611 K2EYJ 517 CT1012 409 OH200 669 ON4FU 606 IL 1x2 515 G4LJW 408 DXCC countries in ElL6FL 669 ON7E 605 [6F110 515 IN3ANE 406 their own right; others 18KNT 567 CT IUF 595 IK2MLY 514 42402 406 E 4461y 667 01143.1W 594 KBOYZ 512 1/14XA 406 DL8NU 664 K2W 591 WT20 404 are not, but by meet- SC.G.,Cfy GNAW 8,.1.1,11 508 EA5403 07556E 661 M AW 589 ESSAI 506 KM4RX 404 ing particular eligibil- 659 F6ULM 587 11090G WD8MGO .102 ity criteria also count 11171P 658 G3ZAY 582 1081WV 468 03027 397 18YTX 656 S5 I E 577 F2I3S 488 06444014 398 for credit. Part of the 101AIG 654 El7CC 574 0E41 482 102IGX 392 fun of IOTA is that it is 63610 653 K07S0 572 W1ENE 470 127DX 391 1001K 651 03XTT 570 SM00.12 469 171513 .187 an evolving pro- 1190.81 650 HB9AFI 569 VEGVK 467 651- NA 386 gramme with new is- K9PPY 648 F6DZU 567 6898614 465 W5BOS 379 0 2811 (.47 ClIZW 560 K5MK 464 06140P 378 lands/groups being G4WEZ 646 F6BFH 557 N61301 461 GONXJ 370 1 1 KFB 644 Sh46CAS 556 WBSEEE 460 activated for the first GS.11.1 639 F6CUK 556 SK6PJ 459 time - currently there Islands On The Air are over 760 listed ISLA NDS CA 01.41 .0a. with reference num- bers. Annual Listing - May 1993 The basic award is IX113G-.1 364 WO9Y 55.3 GliGG 167 FR5212 120 ItUK11.1 363 04NXLITA 249 GOAHC 163 HX.3.1JH 120 for working stations 63.700 362 I2POW 245 EA574 161 K.26BW 119 116.11.1 359 11565F 239 Ei8Au 160 K6G.1 located in 100 islands/groups. Islands or other certificate or who WA2U7B 351 5555551 239 031(14 159 G3I2M21 '19 There are higher achievement have updated during the last year. 117XT 348 0J2MN 236 GW3NXR 158 SM2BOE Its 12YINFI 347 CE710 234 FEILMJ 155 613C713 I's awards for working 200, 300 The last date for mailing up- 12Y2DBU 346 1441/H 227 VE3BAZ 154 I2LXA 119 through to 700 islands/groups as G4BWP 344 G2FF0 226 19306E 154 11C261VE t IS dates/applications for inclusion in FE6ACV 342 W1KSZ 225 OL2GAC 153 664011 lin well as continental and regional the 1994 listings is 1 February GIKYF 341 [AIE VE 225 AA6WJ 153 W4OCU 118 GOCGt. 340 VE 78.1 224 180JU 150 KWOU 118 awards. A Plaque of Excellence 1994. The checkpoint for UK sta- OE61.4KG 331 EA3LS 222 CT t BWW 147 119EXN 117 is available for confirmed con- tions is Philip Marsh, G4WFZ. 28 OL3ECK 327 M ORT 221 209200 146 8(70K13 117 YT7OX 327 WDOBNC 221 66520 145 SM5SVI tacts with at least 750 islands/ Orcheston Road, Charminster, DF2N5 327 OZ5PA 220 DO HUH 145 WA70821 216 groups. Bournemouth, Dorset BH8 8SR. ONTO< 326 035EZ 218 LU IJ DL 144 63.100 116 EA7ABW 325 HBSBIA 218 GOGRK 143 WA3L (16 The new 1993 60 page IOTA G4GIR 325 64013K 216 P29 VMS 143 DL1XE 116 5.8900 Directory provides all the neces- 322 EA501 215 110313217 141 VE 31MO 116 IOTA Contest CT ICOK 322 GM4KHE 215 W W8W 140 (1816G sary information to get started. It EA3KB 320 CT1Yei 214 G3GMY 140 WE2T '16 24/25 July 1993 0147LX 318 LA3IBA 213 0E500 140 SM5OUT I Is is available from the IOTA Direc- CT1AHU 317 ..1H3A1U 213 FIHNO 139 WB4UHN 115 tor, Roger Balister, G3KMA, La PARTICIPANTS planning to op- G3XON 316 SMSBMB 211 KIWNT 136 ((04 OLD 114 G3OCA 3/ SM I CNS 210 OEIRGB 137 113150 113 Quinta. Mimbridge, Chobham, erate during the contest from an KNII 311 EA7CIW 210 KD1CT 134 AA57A 110 Woking, Surrey GU24 BAR. price island should check the IOTA Di- WF111 311 PA3E X X 208 NH6U 133 GOABY 110 Cita? 310 ON-1014 207 FEIJSK 133 11511-12M 109 £6 post-paid (£7 outside Europe). rectory to make absolutely sure I4CS P 308 6139HT 207 G3LCG 132 N3ERM 109 KO7EC for which group it qualifies. Not all 308 OE 1MEW 207 04654 132 IK I C-.10 109 1188XX 308 64700 206 At14DL1 132 DL9MFH 109 islands qualify for IOTA! Stations KA5TOF 307 1.52(12 205 GIXOP 131 G4POF 108 The Honour w0G LO 306 6/L7BY 203 SM6TEU 130 neawr 108 located on the mainland of Great EA5130 304 006GC 202 0.270F 130 EA9PY 106 Roll Britain (G/GM/GW) should quote 03708 303 (44 xRx 701 JAICKE 130 G4ASL 107 02132.0G 302 G3TLG 201 RZIOA 130 UA9MCM 107 THE IOTA Honour Roll lists the the reference number EU -005. S".1613HU 300 W3YN 201 G3WCY 128 1617140 107 as should stations participating NN2C 300 640441 200 IK2ECP 128 BAB 107 callsigns of stations who have a 5870H 300 UY5XE 200 DL 1140 128 GOFYx 106 checked score which equals or from Brownsea. Canvey, Foul- 1213001 296 007XX 200 03 WOO 127 63470 106 WIOPB 290 G4SSH 195 uTsErl 126 HAIAD 106 exceeds 50% of the islands/ ness, Hayling, Mersea, Sheppey (13SJX 288 A MC 194 0658.441 126 73700 106 and Walney Island - they all count VE3JGC 284 PS 780 194 F6DRA 125 GOAEV 105 groups which have been activated 1113ICSA 276 G3V00 194 10.7UR 125 N2KHH 104 since 1945 and who have se- for the main island Great Britain. G3DZS 275 Go.n/A 193 HB9DDI 124 VK6LC 104 and not for a different group. G4FAM 269 G3SWH 191 Cl (01' 124 K8VKI 104 cured a certificate or updated GW40F0 268 GOD VT I85 119JPK 124 WA1ELE 104 during the last two years. The SM4OUS 268 ITOVDO 184 N5OVF 123 UW956 104 2VS 261 04513.1 184 11(211_61 173 OF4SA 103 Annual Listing lists the callsigns 0281M 265

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RADIO COMMUNICATION June 1993 PETER RODMELL COM MUNICATIONS G3ZRS BRITISH 'Hand-Built' LINEAR AMPLIFIERS `MOBILITE' MOBILE MICROPHONES From the originator of the Heatherlito comes the Next Generation i i Using our famous Explorer/Hunter/Discovery designs we will provide Models to suit Kenwood 241/702/732/TH78/48. Aline() OR599/112/0..1560/1130, amplifiers to your specifications with drive and output powers as required. Yeesu 290/5200 and all current models Utilising Eimac 3-5002 or 3CX800A7 valves the amplifiers are hand-built for Choose from Mobile, Portable and the new EaY kit use in Com mercial/Professional/Medical and Amateur Radio applications. Mobiles offer * Xtal controlled tone burst Examples: * Voltage regulator HF Hunter 500 (500 Watt) from £985 incl VAT *Variable audio gain HF Explorer 1000 (1k Watt) from £1,385 incl VAT *Variable tone burst gain *Easy maintenance with modular design 2m Discovery 800 (800 Watt) from £1,295 incl VAT *British made Amplifiers up to 10kW available for professional use Prices from £18.50 portables and £39.95 mobiles. COMPARE THESE BRITISH MADE AMPLIFIERS WITH THE JAPANESE AS REQUESTED our NEW portable range ieatures a true headset and Electret mie AND AMERICAN EQUIVALENTS ! l ! Ask about components for your amplifier project . . valves, transformers and .'isjithex wt'dnaelygFuaRrâ mail Order Service. RF parts always on stock. — Call today for safe operating tomorrow •'• CONTACT PETER G3ZRS and discuss your requirements. CONTACT SIMON G7OG W tor further details. SECOND HAND/PART EXCHANGE RALLY CORNER Clean second hand equipment at reasonable prices always Two good bets for July ... available and all carry 3 months warranty. 1. Look for us on the Ground Floor at the YORK RACECOURSE for We are known for our sensible Part Exchange Offers with no the YORK RADIO RALLY on SUNDAY 4th JULY. catches!!! 2. NEW VENUE .. the return of the Humberside Radio Rally to be held on SUNDAY 25th JULY at the BEVERLEY RACECOURSE. Upgrades a speciality ... Daily changing stocks. In JUNE we will be at ELVASTON, DENBY DALE & LONGLEAT. Also our Search Service to find a particular rig has proved very popular ... Give us a try with your requirements. Rally Secretaries please call if you would like us to support your event CONTACT PETER G4EJP for best prices ... You will be pleasantly surprised!!! CONTACT GWEN for our rally details. FIELD HEAD, LEC O NFIELD ROAD, LEC O NFIELD, BEVERLEY N ORTH HU MBERSIDE HUI? 7LU Call/Fax Next door to petrol station between Beverley and 6413550921 Leconfield on the A164, 1 mile north of Beverley

GUIDE TO UTILITY STATIONS 1993

KMG 11 1h edition • 534 pages • £ 30 or DM 70 YOUR NEW CALL SIGN FOR BUILDING 5000 new coastal and fixed station frequencies! Our bestseller covers the complete frequency range between 0 and 30 AND CONTENTS INSURANCE ARHI MHz. We aro the very first non-governmental monitoring service 10 use state-of •the-art equipment such as the revolutionary new WAVECOM It you take Out an Amateur Radio Home Insurance Policy, in W4100 teleprinter systems decoder. Latest military and political events conjunction with your Amateur Radio Insurance Policy, you will such as the impacts of the Gulf War and the Balkan War, and of the re cent and current revolutions in Eastern Europe. are covered exclusively by receive up to £30 worth of Radio Society of Great Britain vouchers our UTILITY GUIDE. Sophisticated operating methods and regular over• ABSOLUTELY FREE .. the vouchers can be redemmed against the seas monitoring missions 11992 for months in Brunei, Dominica. Indone- sia, Malaysia, Martinique, Sabah and Sarawak) complete this unique book wide range of R.S.G B merchandise or your annual R.S.G.B. The completely revised new edition includes a frequency list with membership fee. 19549 frequencies, and a call sign list with 3590 call signs. Up•to•date The amount of vouchers you receive will depend upon the size of schedules of FAX moteo stations and RTTY press services are listed both alphabetically and chronologically. Abbreviations, addresses, codes. Mini- your home insurance premium. eons, explanations, frequency band plans, international regulations. modu- If you would like to receive a quotation for building and/or lation types, NAVTEX schedules, O and Z codes, station classes, telex contents insurance please complete the Homeplans Quotation codes. etc. - this reference book lists everything. Thus, it is the ideal addi- tion to the World Radio TV Handbook for the "special" stations on SW! Request Form Further publications available are Air and Moteo Codo Manual, Guide to Facsimile Stations and Redioteletype Codo Manual 112th editions). We Amateur Radio Insurance Services have published our international radio books for 23 years. They aro in FREEPOST, SHEPHEARDS HURST, daily use with equipment manulacturers, monitoring services, radio ama• tours, shortwave listeners and telecommunication administrations world• GREEN LANE, OUTWOOD, SURREY RH1 5ZA wide. Please ask for our free catalogue, including recommendations from TEL: 034 284 4000 all over the world. For recent book reviews see Mike Richards G4WNC in Shortwave Magazine 2/92, 7;92 and 10i92. All manuals are published in the handy 17 x 24 cm format, and of course written in English. Name: *A.R.I.S. policy no: Do you want to get the total information immediately? For the special price of E 105 I DM 250 (you save t: 11 DM 401 you will receive all our manuals and supplements (altogether more than 1700 pagesil plus our Address: Cossette Tapo Recording of Modulation Types. Our prices include airmail postage to everywhere in the world. Payment can be by E or DM cheque, cash, International Money Order, or postgiro ;account Stuttgart 2093 75-709). We accept Access, American Express. Eurocard, Mastercard and Visa credit cards Dealer inquiries welcome • Postcode: Age: discoure rates on request. Please mail your order to

Building sum insured: No of bedrooms: Klingenfuss Publications REVIEWED Hagenloher Str. 14 Renewal date: Existing insurer D-7400 Tuebingen IN THIS Germany Daytime telephone no: ISSUE! Tel. 01049 7071 62830 R.S.G.B. membership no' 'Applies to members only

78 RADIO COMMUNICATION June 1993 As well as frequency listings, the book holds useful data about prefixes in use by various countries (Indonesia can use the 8A GBOOSH/Phoenix The to 81 block), a callsign list (for example DXX identifies Radio Manila in the Philippines). Aerial Auction BadCom RTTY press services (which stations transmit bulletins at what times, in what languages, on PHOENIX SMD have donated the Book of the Month what frequencies), meteorological RTTY serv- 144MHz 14-element long Vagi (worth ices and FAX schedules. Also, there is a nearly £200) used by GBOOSH, to the Gt section listing addresses of utility stations Ormond St Hospital appeal, and the (helpful if trying to collect a OSL card). Society is pleased to offer it for sale by by Bob Treacher BRS32525 The book will certainly help identification of sealed-letter auction. stations and will undoubtedly help you get To make an offer for this super an- more QSL cards for your collection. There is tenna, just write your name, callsign and much information to interest those people address on a piece of paper, together GUIDE TO UTILITY who are interested in logging broadcast sta- with the amount of your bid, and send it tions, and at the same time much information STATIONS to us in a sealed envelope. Do not send for those who like to monitor FAX stations. any money! By Klingenfuss Publications Indeed, whatever type of Utility Radio trans- All of the envelopes will be opened on (ISBN 3-924509-92-1) missions interest you, this book is a must. It is the most comprehensive, reliable and up-to- 31 May and the person found to have THE REVISED 11TH EDITION of this ex- date book that I have seen. made the highest bid will be contacted. tremely useful reference book is now avail- The guide is available for the equivalent of Arrangements will then be made for pay- able. It covers the complete shortwave range Dm70.00 (currently £30), payable by cheque ment and delivery. If you do not wish from 3 to 30MHz, plus 0 to 150kHz and 1.6 to in your local currency or by International your details to be passed to Phoenix 3MHz. It includes details on all types of utility Money Order. SMD after 31 May, please indicate this stations including CW, FAX. SSB and RTTY. clearly when writing in. The numeric frequency list covers 19,549 Klingenfuss Publications, Be generous and help the children at frequencies of stations which were monitored Hogenloher Str. 14, D-7400 Tuebingen, Ger- this hospital. Send your bid in now to: by the Editor of the book during 1992. The many. Tel: 01049 7071 62830. GOSH Appeal, book is built exclusively on continuous moni- toring of the spectrum, backed up by regular monitoring missions. Recent events such as SEE OPP OSITE for more RSGB, Lambda House, the changing face of Eastern Europe, the Gulf information from Klingenfuss Cranborne Road, Potters Bar, War, and the global frequency change in the Publications. Herts. EN6 3JE Maritime Mobile Service are included.

timebase, front panel end pieces and carry- Spectrum Analyzer (Model 2800A) and its ing handle. Any help welcomed. His address S-Band head (Model S-900B) required by is Marclecote. Ledbury Road, Ross-on-Wye, Pierre Dehez, ON4IV. His address is 10 Hereford, HR9 78E, or tel: 0989 62906. Chaussee de Wavre. 1370 Jodoigne, Bel- gium or tel: 32 10 813882. • David Murray. G7HME needs any informa- tion on the xtal controlled, PMR Telefunken • Douglas Wilson. GM3VCO. needs the D679 VHF/UHF duplex hand-held Trans- Manual (or a copy) for a Tasword Word ceiver. Please write to 55 Granville Park. Processor disk used on Commodore 64 Aughton, Lancs, L39 5DT. Computer. Happy to refund all expences in- curred. His address is 8 Broadlee Bank, • Manual and/or Circuit diagram required for Tweedbank, Galashiels TD1 3RF. • Manual/circuit diagrams for the Windsor AVO Universal Bridge (circa 1953, case Model 65C Signal Generator made by Taylor style similar to Avo Electronic Test Meter). All • Circuit diagram for oscilloscope made by Solartron 'Solarscope CD104 .3'. Any costs Bros of Slough, also any information for a costs refunded. If any information please supply source for the J W Miller Co, RF contact Mr E J Young, G3IVH, QTHR, or Tel: will be reimbursed. Details to Mr J Proctor, GODCH, 5 Bank Top Hamlet, Whickham, inductor Coils, No's 4409 to 4508 required by 0473 730442. Norman Porter, GOIRK. 23 Calder Court. Newcastle upon Tyne. NE16 4DD or tel: 091 • Paul Simpson, GORUR, needs any infor- 488 5210. Britannia Road, Surbiton. Surrey KT5 8TS or mation/manuals for a LINK monitor with PC tel: 081 390 2650. Term keyboard and system ROM V2.8. Happy • Technical information/circuit diagram for Phillips portable communications Receiver • Eric Fielding, G4IHF has a Multimeter to reimbursed any costs. His address is 231 L6X38T, early tansistorised model. Also Vol- (about 10 years old) known as Supertester Caxton Street. Sunnyhill, Derby DE3 7RB. umes 1 & 3 of the paperback 'Radio Servic- 680R made by ICE Milano, Italy, and distrib- • Manual and demonstration cassette for a ing' by G N Patchett published by Norman uted by Electronic Brokers Ltd, 49/53 Pancras Currah p Speech sound and speech unit for Price Ltd. required by Jim Cookson, G4XWD, Road, London NW1 20B and is looking for ZX Spectrum. All expenses reimbursed. Any OTHR or tel: 0562 823674. the present address or telephone number of information to Mr W Barrett, GW3DGT, • Circuit diagram for the Collins 516F-2 PSU Electronic Brokers Ltd., if still in business. Stevina, Ludchurch. Narberth, Dyfed SA67 and/or information to convert from 110V to Information to 6 Thornton Ave., Lytham St. 8JF. Annes, Lancs, FY8 3RL or Tel: 0253 726685. 220V required by Ron Thompson, FPNE1KM, • Derek Pantony, G3KXB, needs any infor- B P, 383 Saint Pierre, 97500 Saint Pierre & • Operating manual/circuit diagram for a mation (circuit diagram/power requirement) Miquelon, or via Vince Lear, G3TKN, who is Tandy/Micronta Model No. 21-522 3 meter for a German Airborne DF Receiver Type OTHR. CB tester, Power/Modulation/SWR and a EZ6 and a Circuit diagram only for US Signals • Any details, ratings, characteristics and monitoring socket, is required by Mr S Slater, Corps Panoramic Receiver BC-1031-B connections for two transmitting valves: GOPQB. 24 Lullington Garth, Borehamwood, (450Khz). He will be pleased to reimburse Raytheon RK-715 and Mullard TV-125. Any Hens WD6 2HE, or tel: 081 953 2164. any expense. His address is Springmead. 6 expenses will be re-inbursed. Information to Longtye Drive, Chestfield, Whitstable, Kent • Ray Hill, GOIMV, need a circuit diagram for Mr M D Fowler, GW3GKZ, Ty Gwyn, CT5 3NG. a Solartron Schumberger A100 Oscillo- Abergwynant, Dolgellau, Gwynedd LL401YF scope, with A101 V-amps, A112 Dual • Instruction/service manual for the FXR or Tel: 0341 422447.

RADIO COMMUNICATION June 1993 79 BREDHURST ELECTRONICS LTD High St, Handcross, W. Sx. RH17 6BW electronics (0444) 400786/400124 Fax (0444) 400604 ALL ITEMS AVAILABLE BY MAIL ORDER, PLEASE PHONE OR FAX YOUR REQUIREMENTS AERIAL ACCESSORIES KEN WOOD TS-50S GAPTECHNOLOGY P&P EAGLE DX VI 50m 16SWG H/Drawn Copper Wire £12.95 3.50 Enjoy high-performance Small Ceramic Egg Insulators 1.00 .25 • Special Design for pole Polyprop Insulators 0.75 .25 com munications plus mounting 'T Piece Polyprop Dipole Centre 2.85 .25 go-anywhere convenience • No radial wires Deluxe Dipole Centre. 259 Socket 9.35 2.00 Self-Amalgamating Tape 4.95 1.00 with the world's smallest • Operates on 40. 20, 17, 15, 300 R Slotted Feeder, per metre 58 .10 12 & 10 metres 450 R Slotted Feeder, per metre .50 .10 HF transceiver • Total length 21 feet Stranded 16 SWG H/0 Wire, per metre .30 .10 G5RV Full Size 20.95 3.50 G5RV Half Size 18.95 3.50 £289.95 URM67 50R Low Loss Coax, per metre .95 .25 CHALLENGER DX VI URM76 50R Coax, per metre 40 10 • Operates on 80, 40, 20, 15, SPIRO ANTENNA PRODUCTS 12, 10, 6 & 2 metres PB1 1:1 Balun 2kW P.E.P 17.95 2.50 • Ground mounting, height PB4 4:1 Balun 2kW P.E.P 19.95 2.00 31 ft LC160 160 Mtr Antenna Shortener Pair 24.95 2.50 LC80 80 Mtr Antenna Shortener Pair 23.95 2.50 T15 21MHz Traps 1kW (Pair) 39.90 2.50 £269.95 120 14MHz Traps 1kW (Pair) 39,90 2.50 VOYAGER DX IV 140 7MHz Traps 1kW (PaIr) 41.90 250 160 3.5MHz Traps 1kW (Pair) 41.90 2.50 KEN WOOD • Operates on 160, 80, 40 & 20 metres We are an official sales and service centre for all • Ground mounting, height WIRE ANTENNAS Kenwood Amateur Radio Products Any Wire Antenna can be made to your specifications. 45 ft trap dipoles, windoms, vee's, quad loops etc. Carriage and packing charge PHONE FOR DETAILS minimum £1.50 per order £459.95 Phone for prices on Ken wood !corn Yaesu, and our wide range of accessories

BREDHURST ELECTRONICS LTD, HIGH ST, HANDCROSS, W. SUSSEX RH17 6BW Open Monday-Friday 9am-5.30pm Saturday 9.30am-4.30pm.

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The leather holster holds both rig and spare battery. It can be worn either attached to

Dnepr rirersurces - waist belt (not supplied) or shoulder strap 10MHz, Shitlz. ilAtiz * Provides 10MHz. 5MHz & 1MHz Start tern sterna - * Used lot calibrating equipment bal rehenes quartz crystals. TCX0s, bete than Into. VCX0s. oven crystals (I sec) ONLY £14.95:1 * Phase locks to DROITWICH (rubidium controlled and traceable ro - ±2x10* NPL) It sec) * For ADDED VALUE also phase locks Re ALtOUIS (cesium controlled Intern- kinds to ALBERT THURSTON and traceable lo BIPN - French at to NPL I ?ale .110:0secl TEL: 0533 627515 * British designed and British manulactund Sort it e tallies ea the SYON TRADING stand fix mote inloanation coal.ter HALCYON ELECTRONICS 3 FROG ISLAND VI A 423 Kingston Road, Wimbledon Chase, London SW20 8JR LEICESTER LE3 5AG Tel: 081-542 6383

HIGH PERFORMANCE PRODUCTS FROM AMDAT DRSI DPK-2 TNC DSP-12 Multimode Controller The DPK-2 is a full feature built and tested TNC which offers you all the facilities The DSP-12 is the ultimate Data communications controller. It comes complete that you will need for VHF/UHF operation. The facilities include: with all the satellite communication modes and offers the facility to add a new mode by downloading software Into its 1Mbyte of RAM. We also offer a free Version 1.1.8 Firmware Personal Message System EPROM upgrade service to all our customers. Just some of its facilities are: CW Identification Low power CMOS construction HF Packet VHF Packet RTTY ASCII All this for only £119.00 (pp £4.50) 400 BPS PSK 1200 BPS PSK 9600 BPS FSK UOSAT11 ASCII Watch this space for details of the new features which will be coming soon. DRSI PC card TNC All this for only £789 (pp £6.75) We have been selling the DRSI PC cards for over 5 years and we have many hundreds of satisfied customers. It you want to use an IBM PC or clone on packet JUNGHANS RADIO CLOCKS radio the DRSI cards offer the easiest and best way of getting on air quickly AMDAT still keeps a large stock of Junghans Radio Controlled clocks which use Type 1 - 1 VHF/UHF port + 1 port for external modem £149 MSF or DCF77. Digital alarm, mantel and wall clocks are available. Type 2 - 2 VHF/UHF ports £179 Prices start from £53.95. Send an SAE for a full Information pack. Type 4 - 1 VHF/UHF port + 9600 FSK modem £299 All Prices subiecl ro change VAT Included e 17l4.% Post and packing extra p&p £4.50 SATELLITE TRACKING 4 Northville Road, Northville Bristol BS7 ORG. 0272 699352 Kansas City Tracker cards in stock Please Call for lull details AMDAT

80 RADIO COMMUNICATION June 1993 CONTEST CLASSIFIED All rules should be read in con unction with the General Rules •ublished in Contest News Janua 1993

LtChlteld, who yet again collected me contests. Please help them land your' character Included in the consign held! HF RESULTS Edgware trophy. Despite poor propaga- selves) by adhering lo the following: Another failed to pant the last eight tion. Aberdeen (43rd last year) moved Use RSGB Log Sheets or keep to the OS Os on one page, an error whch was up lo 41st place to re-state their domi- format. not detected by the entrant A third cot. any com ments or observations AFFILIATED nance of the event from north of the fueled data and lost its user over half his would be welco med Print handwntten data in BLOCK CASI. Border O S Os. I could = dime SOCIETIES' TEA M TAIS, and in Ink. Leading stations Increased their tally Checking AFS has never been easy If the entry Is sub mitted on disk, no C ONTEST of OS Os over 1992, but poorer condi- Dupe sheets should be Only a list ol all but this year seemed more onerous Dupe sheets are required, only a sum- For the first time strir,e 1976. there was tions meant weaker signals and more Ihe callsigns worked and the serial than for some Nee. Thanks go to G3KKO. ma ry sheet for each station a disappoinling reduction in entries lof m eekest Tho individual honours this number sent or lime of OS O, soiled into G3 MCK. G3 WRFI and 0410k1 who pro- II every AFS entrant spent just one C W AFS with 17 hewer tea ms (47 fewer year were decided by accuracy. giving alphanu meric order (by whole call, or vided invaluable assistance and are now the closest over result • only six points minute doing something that the adiudi- stations) submitting logs Conditions first or tast letter of suffix). Any more receiving counselling and hair trans- color would otherwise have had to do wore widely reported as poor for the separating the loading three entrants. information decreases teadability and plant therapy , Logs ranged from excel- (for exa mple, separating fanfold log event and this may have been a con• Congratulatens to Paler, G3KDB, also wastes lime and paper . . any kiss lent to lust plain shoddy and some were sheets and asse mbling the m in order) tnbulory 1ac1or il is also very likely that the 1992 winner. Because of the bye- genders the dupe shoot useless and a accep ted only because the adjudicators then the achudiCator would have FIVE some operators, unable to support both yea r rule he Is net eligible to receive the waste of your time an effort. wore unwilling lo spoil a tea m effort HOURS less Work. Marconi Trophy, which passes down to events. have 'detected' lo SSB AFS. because of a single offender Grateful Log ell OS Os. Don't >is* omit the dupl. However, it has been noted that, par- Dave. 04 Eke. pipped forth° toad by an As la sl year, the third character In the thanks go to all those who look the catos and re-use the numbers. This equip ment code group has been ornit• hcularly in the last two or three years, infurintmg single poinff Congratulations trouble to present their entnes properly practiœ is penalized when detected led, since no•one claimed to have more many dubs have been expertencing also lo Neil, G3 0AY. another memoirs and especially to GDKUC, the RAFA RS Read through the log for transcaption than a single•elemenl antennet If other difficulty in raising a full team of live and winner. this year taking third place. A Contest Manager. who himself produced errors fey G3 0 - calls have not been Il has been suggested that Ifift size el special welcome to Tom, 2E0ACY. Me characters are missing It Is because no excellent dupe sheets tor every one of issued!) and, il computensed, typing lust Novice to enter AFS. details were given with the log Centro- tea ms in CW AFS should be reduced to his entrants! 'oh instead of 'zero', which will cause fed antennas are clearly the most popu- three. as in the SSB event This sugges- The same live grou pa took the lead' dupe checks to fall tion will be considered by the HFC C Mg positions as last year However.. il All adiudeators are unpardvolunteers lar and of those, well over SO% were before publication nl the rules lot 1994 was 'all change' for placings except for who give up Mae free time to run you Don't place absolute trust In compels= G5RVs W here are the long•wres and end This year. one computensed log Marconie that are capable of such good contained an unmarked dupe, believed performance from a small site ma local to be due to a blank or non•pnnting event like AFS? G3 UFY A F FILI A T E D S O CIE TIE S T A B L E

POSN CLUB STATIONS CONTRIBUTING TO SCORE TOTAL 84 G4L28 153 517 • LICHFIELD ARS 'A 03800 Glide 03SU = Ha 04 030 '7382 C W A F S IN DI VI D U A L as Gxvxere 154 Sil 2 . DE MONTFORT UNW MIS 'A 0304v 04100 G4Are G4.109 G•rsnr 0040 S T A TI O N S TABLE 86 133SVW 154 510 3 . VEFILKAM ARC 'A Carat. GlvEti Wimp Et4JKS W WI 11794 07 O UZO 151 500 4 IAD-8EDS CA ceies 00ABC Otile G4ALR GIGIR 11706 Pow, Coll OSOs Eqpt Score 08 00105 149 490 li ADDISCOMBE ARC 031.1Pr 03R07 ('arr, 0481E 03SJX 10211 C,Win 200 4(31 27711 119 0314TZ 148 470 I GRIMSBY ARC 1331-13K 03115p 031451) 04E0K G.3.1148 9702 763 4C5 2777 2 I ENBUO 90 - 03108 144 460 7 SOUTHGATE ARC v+ 133SF0 0314tM C37.W1 04SX T G3KTZ 9330 3 0343AY 785 4C5 2777 90 • 04K1F ISO 480 O GUILDFORD 6 DEIS A 035044 0500 GOEf 0 03012 037115 8129 4 03NKC 770 4C5 2715 90 - 06171 153 480 O RNARS COLCHESTER 433011 aly6C (13WA/ 04‘213 GOPSe 8378 5 048,0.1 274 4Cel 2601 90 • CXUON ISO 460 10 RAFARS YORK 03PSM G2AFv 041UF 031043 (MIMI 7931 8 GIFITE 269 4C4 2630 90 • 031424. 148 480 II EDGWARE I DRS *A Griuz 031005 0341311 03Sny C.4101.40 7434 287 4CA 2818 7 03321 96 G475141. '45 447 12 FINARS POFITSMOulli 03ux Glit0 03JFF 030211 00lX0 0920 El • G4F/184 257 ICS 2501 96 G4RFR 142 387 13 DC MONTFORT UNIV ARSE,' 03011Y GIEOF 04020 05MT 6651 8 • G3THIC 254 4C8 2501 97 133SHY 138 368 14 VERLAAM ARC 13' 43-411.1X C33NOlt C33.+JE G4SUP 6616 10 G41381 265 .C5 2498 se 031/RS' 137 360 15 CRAWLEY ARC G3GRO G1JKF G31140 G3WSC G3I4AU 8590 11 G41ABC 252 3C5 2497 00 00.101 139 357 16 PLYMOUTH RC GOIVZ 040FR 001112 G3LAN 6507 12 G3YEF1 247 4C 2417 100 G4YYR 137 354 17 STOCKPORT RS 'A' G3KAF GOJOi 01140.1 046 20 (TASAS 6376 13 (131.11Y 742 4W3 2415 101 = (33AFF 147. 350 le FL1GHT REFUE LLING 'A G31/13.10 GlAira Cernu G3PFM GOM M 6202 14 03%/140 254" 4C3 2397 101 • 1330•94 136 350 10 SUTTON & CHE N. RS 030LX 3341150 GOA » 03DCZ C•043XC 5982 15 03550 242 4C 2344 103 03021.1 135 340 20 BROMSGROVE DAFIC G4AAL 433ini 03114PC 0.1400 04 00 5728 16 040311 238 4C4 2338 104 G3E12 132 310 21 CROYDON (SF3CCI 63015 G001 04GTO 08m G3L1CX 5687 17 (13WVO 234 405 2327 105 GrIKG8 134 310 72 M EARS HALTON (13HEJ 0311.4K 03ta 04SOC G2CWY 5634 18 GAMS 235 304 2308 108 G4SUP 144 307 23 RAFARS N LUFFENHALI 034KOG COTCO = RV GOORJ GOKUC 5541 19 G2134.1' 211 4C 2285 107 G3KKO 130 200 24 READING & ()ARC 'A' G3XIT G ARES GOOPB GORMAR 03WGV 5407 20 G5tP 246 3C 2776 100 031140 131 701 25 SCUNTHORPE ARC 'A' G4008 63PC4. 031040 04360 04028 5322 21 G3FLYP 231 304 2770 109 G41-180 130 284 28 GRAVESEND AS 04800 GlEAM 5278 22 GICNY 228 3C M r 110 03120C 128 Zee n s MANCHESTER RC A> GOLZI. G3SVW 0309M 03V1114 GONID 5217 23 G3SYM 230 405 2251 111 133MA 129 267 28 RNARS BIRMINGHAM G4SFO GNP G4PIIC 04010 Ci4TM 5059 21 03HEJ 226 405 2240 112 G3HFO ISO 244 233 CHELTENHAM ARA W OO G4Vx up GM/AZ G3NKS 501a 25 04-109 403 2187 113 G3OHN 124 240 30 ECHELFORD ARS 047SeeP 036110 031404 G3010 03Jut 4884 28 03011v 221 4C5 2188 114 04050 129 234 31 MAIDENHEAD & °ARC 431ANK 0 3825 /3131WEI G3LvW 4812 27 GONZ 218 4C5 2161 115 • 43211LU 123 230 32 LEICESTER ARS 03LRS 031.Pas GOAL2 G3TOF 1727 211 333SCC 225 400 2153 115 - 030014+P 123 230 33 WESTON-SUPER MARE 15 < MAC OCUON G3BLO 0410413 4662 216 4C 2145 29 G3UJV 117 • G31GU 123 224 34 HEREFORD ARS 04ChtV 03EPV G3WRO 04.1519 04600 4605 30 GIALR 221 X 2140 117 . W AGE 124 224 35 ;MARS MMDLESEIROUGH Gset0 G34891 GITCH GY M 031152 4584 31 035964 222 4C 2137 119 • COSSA 131 2r0 38 GLOUCESTER ARS 04Yrn 03MA GOECJ 00131013 G4CIB 4566 32 04481 221 3C4 2104 119 • Ge nf 128 210 37 RNA RS LIVERPOOL G31421 M ae GU M 13816/11 CA ME 45431 33 GIGIR 213 3 00 2107 119 • 031X2 122 210 38 YEOVIL ARC G3GC & MR G3COR °NCO * MVO 4341 34 G4P00 211 301 2090 122 • 0314C41 121 207 39 NORFOLK ARC G400C GADYG 035044 03111'J EL3OKO 4144 35 031‘wi. 207 40 2010 (»ACM 122 207 40 CHESH MA A DAMS G3XZG G3vity C M G_ G3AYS 4085 36 ( Mew. 298 30 Ken 122 • 04EYE 128 207 41 ABERDEEN ARS'4" 0/.44AFF CiM3WIA 01.13070 01.40.aul GMOMYY 4063 209 4082 2054 37 031102 125 03Y)0( 123 reg 42 CENTRAL LANCS ARC 'A' clef DX GAZYN GOGVA GOLF* ENTZR 4050 38 G3VYI 207 4W) 2040 126 (34141A0 124 107 43 AXE VALE ARC Ci3HAL G3DIC Gaver 03FFII GOCA 3911 39 G3KAF 205 30 2034 127 GW1.11 119 184 44 TORBAY MIS G31013 133LEu 0014011 GOEIXt G34313U 3587 40 G3XTF 203 4C3 2070 128 04040E 119 180 49 NEW8u/W & OARC G3ZGC GOORti 03NVO 134020 OAGNIC 3584 Il G3YEC 203 3C 2011 120 1331.1u 118 174 48 STRATFORD ON AVON a, DRS GOOG+4+P 0314XR 00CDO GOMTW 3430 42 03GLL 212 4C2 2001 130 G3PARC 117 170 47 HORNSEA ARS

8e8§eeeF4AVegggeMtrinAl8KM8qe8eXMU8SIWX8811q8eqeri8e1IMV88%888eM4Met,àVe8 01 • 414SX7 170 IC 1541 166 = 133PWN 95 8e8§eeeF4AVegggeMtrinAl8KM8qe8eXMU8SIWX8811q8eqeri8e1IMV88%888eM4Met,àVe8 93 , • Foloorn 1 Perry 51 = 133451Y 15/3 303 1541 186 • GOMBO 95 93 , • CryelyAle ol Meet 83 03141F 154 IC 1537 170 3 031-40.1 931

R A DI O C O M M U NI C A TI O N Ju n e 19 9 3 81 CONTEST CLASSIFIED

70 • 02010 100 3W 931 244 . .3060C Su 680 SINGLE OPERATOR FIXED STATION SECTION HF CONTESTS 70 • GOASA 97 4C 931 244 - 001198 56 580 Pot Caus e Scou, OSO 14.11 Loc Dom OX 601 73 • (309119 96 3C 930 246 CRUVEY 61 575 CALENDAR 64WKN ,S44.• 144 51 9203 DJ2.15/A 566 73. 03111 95 3C 030 247 04PUI 63 574 2 001111. 53375 120 61 9219U 03113CU 610 53 Jun NW (Fee 931 73 • 0400x 96 302 930 248 GOCDO 62 571 3 0361Eii 39788 128 49 9106 0.12.15.14 $44 19170 11111 An Asa $68 76 63LVw 93 30 927 249 64600 64 564 4 GOCPE 28704 126 45 91PF 0141(501, 495 26/21 Jun Summer 1 8MHz CW tMay 931 77 0060.1 99 3C 925 250 03w0V 56 560 5 08•941 »1371 95 49 91011 0221S/A 557 3/4 Jul Venom & SSE 78 6301C 94 3C2 920 251 G2C WY 55 $50 GANIF 11900 52 34 8179 05105931811 438 10n1 141 RSG8 SWL Contest 79 • 640/0. 92 3W 910 252 004071 57 548 7 01048 19227 62 43 9251 OMOGNO 443 1091 lul IARU Chempeonste 79 • 030MM 91 3C2 910 253 Gd6619 » - 547 04Se2 9517 45 31 8111( G141LSE9P 370 17/16 Jul SCANETC W 81 G4r4WK 91 30 907 254 G UYS 66 541 9 00.1134 6120 40 29 0111 011084097P $02 17/13 Jul HX DXCIY 82 03F6141 92 303 890 255 M HZ 56 537 10 07420 7200 43 30 90AS 0140650RP 464 63 030001 100' 3C 881 250 • OCOXT 52 620 11 6410/4 sezre 41 29 01WC GMOMGRP 489 18 Jul Low Power Fired Day IMay 931 84 047C81 91 30 574 250 - 0044914 53 620 12 GIKZE SU 14 14 927b G4S6D 245 24/25 Jul IOTA SS9 iMur 931 85 • 133197 63 20 970 250 • G4XJV 52 620 28125 Jul Veneoretx CW 85 • OW4X014 88 3C 670 259 G4CA 54 517 1 A. FlOPOC*11 f noir change ol 64tel 87 04682 98 30 1560 260 W M? 53 500 11 Aug YO OX (CW,SS191 58 ELIWSC 90 3C 847 701 0313111, 55 497 1ST 1296 MHZ FIXED CONTEST 14115 Aug WAE ICW) 89 G4S7C 89 XS 637 262 • 03112 49 490 4r5 Sep 588 FIELD 11AV The 'Rust polite com ments regarding co-n*11°ns for 111.5 contest vroro tnat they were 90 Ci3KAU 83 3C 627 262 • GOCEU 49 490 4,5 Sep JAI« AA SS8 91 • CLIKNU 54 3W 620 264 03WFM SO 457 flat • however, a number of he entrants supplied more graphrc descriptions of grim 5 Sep 1200 ctv conditions. Lot's just hope the 11000Sphere 15 MC40 helpful tor the 2nd event 91 • GM3CFS 82 3W2 620 765 . GOKUC 42 454 a lase S111111341 ORS CuMulenret II 91 • 0010P 82 3 820 265 . 040 75 50 454 during November. A word of congratulation should go to G3JYP for is good entry frorn 11/12 Sep n e ssa e4 030120 109" 3C 614 757 GIT.JEtl> St 451 a more remote part of the country Congratulations and certificates go lo the Sutton 18119 Sep SAC CW 807 450 95 • GOGOT 83 3C 268 G310» 45 and Chea m RS, the Soulh Brrmingham RS. Davtd Cox (G8OPR), and Derek Poulter 25126 Sep SAC SU 95 • 001404 85 30 607 269 G406 44 440 (G3 WHK) as the winners and runners•up In their respectrve sections G4PIO 25126 Sep CO W W 97 133ULN 80 3W2 797 270 .34ELY 44 427 70 Oct VK•2( 5,55 417 98 G4USW 80 3W 794 271 021309 45 3 Ocl 21/2814Ht TeepnonyjApi 99 • 03101 82 3C 767 272 G3ABU 47 408 93)(note cnAnge of date1 787 407 SINGLE OPERATOR SECTION 99 • 042714 85 30 273 041201 42 9/10 Ocl VIXIL CW 201 • 03671 76 3W3 780 274 (942AOL 53' 400 PosC•11•16n Pointe 060à Loe Pg. Ant Best DX km 17 Oct 21 /2851117 CW (7647 931 201 • 0808 80 3W2 780 275 • GORDY 39 380 1 08009 3329 23 91FE 100 557 = VP 3193 30/31 Oct COWW OX SS8 201 • (14WNK 81 30 780 275 • GINFX 40 380 2 CO MO( 2331 25 9192 100 557 63.170 383 204 012412 67 303 779 277 • 034913E 35 350 3 133JYP 2038 7 08514 32 2rn 0508.0 392 705 • GIVW 79 3C2 770 277 • 03Y72 35 350 G3MEH 1354 19 9106 I DO 1.06m 138014M 114 705. GIWIUM 77 3W 770 270 • GAGZO 37 340 5 00.184 1225 11 011i 6 4 0237 0193NM 216 207 - 0 2000 77 40 767 259 • (2391.1 34 340 6 06208 7453 11 92.114 50 27010 (33.190 237 0116 20 21( 137 M ena 195 207 . (»WO WS, 89 30 767 281 03702 34 7 066PS 894 10 RSGB 1993 VHF/UHF 709 G301 76 3W 7150 782 03807 35 327 CONTESTS CALENDAR

210 0898 71 3C 757 783 00.02 33 Vffle'eMgMX2n8AAK8e8qn88888e 320 711 034400 77 3C 750 264 134UX13 33 . 307 MULTI OPERATOR SECTION 13 Jun 50/Jitr Trani/ (Ie 93) 212 GOIJOI 80 302 743 285 63JUL 27 270 Pot Cans,. Points 050. Loo Poo Ant nest DX km 19 Jun 432MH: FM lIes 931 20 Jun 70MH: CW (Fib 931 213 GOGVA 82 40 741 286 03007 42' 261 1 030LX 3231 91 VII .0 Soy 13327P 392 3)4 Jul Vilf1401) (Mgr 931 214 • 031102 75 30 730 257 • G4099 29 260 2 08041M 2660 73 92A.1 120 40237 13327P 243 214 . GONT 73 302 730 787 • (341UEW 38' 260 3 (140SP 2603 19 9211/5 200 1.215 PEIE WR 258 24 Jul 14/0414: Low Power (Feb 931 216 03161. 72 3W 720 289 00292 31 257 4 646513 704 8 ace 110 15/15 G4FC0 231 25 Jul 43214114 Low Power (48 931 217 03W90 80 3191 717 290 G M° 241 22 Aug 2nd432 MHz Fixed (Tub 93/ 218 (341GY 81 3C 710 291 GOGAZ 14 240 31 Aug 144MHZ CW CumuUtire IF di) 931 219 GOLKO 71 3C 700 292 0490 Td 230 4) Sep 14414112 Tropby 1Feb 931 220 Graeae lt IC OBI 293 133010) 15 220 15 Sep 14451114C W Cumulative 221 • 631 00 69 3W2 690 294 00270 21 210 1992 1.3GHZ AND 2.3GHZ TROPHIES 19 Sep /060t Tropby (Apr 93) 204 221 • 613.41144 70 3C 690 295 G40191( 72 Entnos were disappointing in weire of the coordinated date with Europe. and we 30 Sep 144M/17C W Cumutalnie 223 04041 70 3C 685 296 M T( 20 200 recesoed a number of entries for the concurrent IARU conlest which did not include 2 Ot1 129604H1 Trophy 224 03EA0 79' X 670 297 • GePTE 17 170 2 Oct 2320MHz Trophy separate cover sheets for the trophy oantesIs where Ihe stations would have had 225 GOORJ 67 3W 667 »7 - 260.0.011 18 170 2/3 Oct 4321.1117-24GIN 6 IARU COnteSt. reasonable scores. I nave tabulated lhoso stations tri the overatt trophy results, but 225 • G4JI07 73 30 667 297 • GOGON 18 170 144 931 227 • GONUIA 70 303 664 300 • 6041 40 17 160 put an ' by their calls rather than a valid position • cenific.otes will only be awarded 5 Ocl 1.3/2.3Gitz Cumulative (Apr93) 04190 16 10 those who specrlically entered for the trophies. 227 • ELINCL 73 3C 664 160 13 Oct 432MHt Cumutitive (Apr 93) 71 X 664 137 GOKX0 302 GAON 16 There were alsoco m ments Mal holding Me tropluesconcurrent with the mult•bancl 15 Oct 1446111: CW Cumulative 230 • 09131731 68 3C 660 GOOEB 10 100 MiC/CPNOVO event meant lha1 you had to try either for a good all band score. sacnhcing 20 Oct 1 12.3Gftz Cumulative 230 • 0371W 66 3192 660 GOFCL 10 100 23 and 13 trophy scores by using these bands for 11110916k tO lhe higher bands, or 28 Oct 432 sad Cumulallve 232 G3FF31 66 305 857 G3T1IF 10 go all out for trophy scores, and lose some atte mpts on the higher bands. Unfortur 31 Oct 2nd 1296/2320MHz Feed 233 GLO MS 79' 3C 650 206 . 64612 9 nobly. d you want actway from coordination, you have to accept that this is the 1 Ner 144MHz CW Cumulative 234 06924479 65 40 640 001131 8 60 weekend voth the greatest microwave actmty an Europe. Perhaps a parboil solution 4 Woe I 3/2 Mil:Cumulative 235 GOLRE 68 3W 636 3.36 - 61.436614 19' 60 5/7 Nov 144MHz CW, Marconele24 235 GOLJE 68 307 630 309 64000 3 efi8e88M8q$Ag8eg882e2r 20 10 this is to make sure you can set your frequencies and dish headings on the high 12 Nov 432MHz Cumulatwe 237 03MCX 62 303 610 bands voth absolute confidence. *thorn needing recourse to talk•back. This would Checklogs gratekny acknowkdkiecl from 18 Nov 1.12.3Gliz Cumulative 238 63704 63 3C3 604 mean lhat, with good organisation at each end - perhaps a Soy point being the use 03FICA and LAllE 29 New 432MHz Cumulative 239 COURA 00 202 600 of fixed 1 minute periods • contacts should be able to be made voli only a frequency 5 Dec t44 Fexed 240 0301:84 73' 3C 590 Llarecni Nosey and locator needing lo be passed on the talk-back band, thus treeing up tho 23cm or 241 007013 63 3C 597 6 Dec 1.3/2.3GHz Cumulahve . Cunene-elect Mere 13cm station to got on with Me trophy This syste m works for EME where signals are 242 • 00F199 60 3C 664 14 Dec 432MHz Cumulative often much weaker than on the terrestrial microwave bands , II you fall, there Is always 242 • GAISN 51 302 554 Unmarked OuplIcate OSO 26.27.28 another 16 hours of the IARU event after the end ol the trophies 29 Dec 70144/432Mlit Fried Conditions were poor. The Three Spires CG, G4IE WP. com mented that advocates For details of rules for European contests. of ORP will be delighted to seo the 125k W EIRP is hopelessly ineffective. and comae 04190 OTHR suspected that their aye's were deploying L-band chaff against the m Having only worked three G stations on 13cm dunng the event. they asked how many UK stations VHF RESULTS were active • I counted 14 afferent G calls in the trophy logs - there's some way lo go yet fill you work everyone! 144 MHZ LO W-PO WER (1992) Many congratulatgons to John Ouarmby, G3X DY, who takes the VHFC C cup for DIRECTION winning the 23cm contes? - a remarkable feat for a single operator fixed station; and This contest brought plenty of actrody and an excellem entry. All Ihree sections were to the Windbreakers CG, G4JA R/P who take the GOZA Me morial Trophy for winning FINDING closely contested and congralulabons go to all winners and runners-up. lits sad to the 13cm event. Congratulabons and certilicales also go to Roger Pro w, G3M E H. again have to announce tho lack of SWL afines. Our thanks Or chocklogs go to The Northern Lights, GOE M G/P aG4XU M/P, and David Cox. GORRJ. G4P10. GI4KS O/P, G3SFG/P. G3 WMFVP and G3U 01. G4Xt.A. TORBAY Q UALIFYING 1.3GHZ SINGLE OPERATOR SECTION EVENT ALL OTHERS SECTION Po. C•111•10n Points 050. Loo Poe Ant Beet DX Date 4 July 1993 Pos Call•Ign SCOM OSO 11.11 Loo Belo OX 1 03507 13212 52 02013 300 40237 DFOCI 628 a .3341ER 4466 34 9105 100 1 05m PAOWMX 425 I 681.07010 173810 271 9020 DGIBCU 742 Map 202 (Torbay and Sarni Dartmoor) 3 0099.1 3399 20 9165 It» 557 OFONST, 529 2 GWORDIM 139748 235 82.1J OL2OM 771 4 08F00 3057 27 9166 45 551A 04XU641.. 349 Asiernbly 1300 for start alt320 GW4NGSVP 57154 162 5324 04000 584 5 0.4600 2329 12 O WN 93 490LY G041:1149 321 GyviyOfrP 83258 184 811GY 0.12.1514 717 Location Orley Co m mon. Ipplepen, 11, G O WN 1685 18 9206 SO 4430 60.314 215 5 GLICA4094. 69930 104 7470 GU MS 597 NG R 827 666 ceCtZg ceCtZg 6 13800X/P 67771 169 . 83150 014760 020 Co mpetitors requinng tea should nobly 7 02007,1, 60800 154 5170 01.1474W 521 1.3GHZ MULTI OPERATOR SECTION Paul Clad'. teL 0803 523599. no later 8 04411GP 57304 148 SeSM 0J216.41. 616 Pas Caltslun Pedet5 0505 L. PIVI Ant 84610X Iran 2 (»G e e 48960 t 32 8051 GIA4ZUKM 681 than 28 June. 64JARP 8997 35 0270 250 2 5en DFSHD 570 70 0400C,P 48730 151 9tRU 13,442U1{19 550 2 04XU MP 5119 23 44FL1 150 6•551 PE11•170 480 Il G4SSO 42168 118 eon 0 6800 567 1 041EWP eel 31 0110 403 I 13n.3 6m PE0400 397 12 01W/(5.17 39690 Ill 0190 G14650.1, 555 Pentad FOREST OF DEAN 13 GuI0415 35090 88 8918( 06101.43FLP 608 • (SOFFIRP 3323 26 & MU TOO 4 x 501 0040981 389 74 0417F/P 34580 126 90145 0141(501, 504 • 0101116P 1610 21 9200 120 2457 04E00 t 76 2M ARDF 15 04001.39 23414 10i 910.90 D.122/1 685 • C1400141, 1220 9 0100 200 5.59 PACEZ 263 16 (36011 19773 55 94013 G8LNC4, 386 W EEKEND 17 (36CTIAP 17248 ee 91)10 0148S011' 524 Dates 10 arbY 1 I July 1993 111 03.142uKAP 14304 33 6611W GaLNCM 709 2.3GHZ SINGLE OPERATOR SECTION 19 04171010 14216 70 0200 GNOMOSVP 485 Ma w Outdoor Lersure 14 • 1:25000, Pos C.11419n Pointe OSO. Lee Pvn Ans Bud 05 20 01A7Me 5740 43 Ultt2&netterz:CS 87 7'? 0140510RP 346 Wye Valley 8 Forest of Dean, or 1 04E00 528 3 93044 10 490LY 0605070 261 dszoe 500 6 92214 4 27017 GOENCIP 208 Landranger 162 - 1:50000, Glouceater SINGLE OPERATOR PORTABLE SECTION 2 00914.1 233 2 919E 35 257 0405010 169 8. Forest of Dean ama. Po, Co11•19n Seom 090 11011 Loe & NI 00 km 611017 45 2 921-1 6 460LY 060442 23 Asse mbly . Saturday. 1030 and 1600. 1 63UALDAP 87290 193 9101 01.20M 636 Sunday. 0930 60CLPe 81331 200 93AF ON2AGC 505 2.3GHZ MULTI OPERATOR SECTION 3 GEUA WP 556 Location: Forestry Co m mission's 40144 131 91A W 0164212KP Pos Cell•lqn Point. 0505 1-4C Pen Ant U N DX km 4 0812011/P 23739 76 ONE ONOMORP 528 Braceland camp slte localod at 1 1342ARP 1661 9 0216 50 2.54n GOO K » 276 5 04XUV11 15015 59 60WP 0141(60/P 487 S0560130. which Is Sk (3m) east ol 2 GOENGP 1402 7 (WU 65 1.5m PAOYANM 412 6 0014AS/P 1 =0 40 709M G141(S OP 432 Monmouth. 3 0106010 1216 6 011/.4 25 t M ENG 766 7 GIN62REA 7616 54 834C ( WN W. 295 • 0380022P 443 5 92013 33 11m 04500 176 More details are available from Phil 15 044713UOP 7020 25 UkiiitZee 86JF 0217AX,P 554 10 1.901 C6P10 212 • G6SFRrP 213 1 110LIU Smith, GW1X BG, tel: 0792 642001

82 RADIO COMMUNICATION June 1993 THE TEC H N OL O G Y PARTNE R S HI P

To £30,000 pa. Dependant on age and experience. Europe is leading the world in implementing new digital mobile communications systems such as GSM CT2, DCS1800 and DECT and The Technology Partnership is in the vanguard of this movement. Our business is product development and we are active in all these standards. We have also worked on analogue systems such as NMT, TACS, CT(), CT I and AMPS . In addition, we are already working in areas where the standards are still being formulated, such as HIPERLAN. Our focus has enabled us to grow by 40% per annum over the last five years. If you are working in a boring environment, lacking opportunities or challenges, we can change all that. We are looking for enthusiastic RF engineers to join our RF team working for clients in the UK, Europe. the USA and the Far East. You should have: • an excellent honours degree e experience of RF design, preferably in mobile communications If this sounds like you. please send your CV to: • Ms Kim Nicholson, Personnel Officer,

The Technology Partnership Ltd, •:'454>?,* Melbourn Science Park, Melbourn, Royston, „4><>4):60,„

Herts SOU 6EE.

CA MBRIDGE Itil

Government Communication Headquarters Radio Officer

GCHQ requires experienced RADIO OFFICERS. If you ore looking for o career which will build on the training you have received, contact GCHQ. We require skilled and motivated staff, with a high sense of purpose, to study our communications ocross the whole spectrum, from DC to light To quality you require o minimum of 2 years recent and relevant radio operating experience. We would prefer you to be capable of reading morse ot 20 wpm, but if not, full training will be given at our Training School. For candidates without rodio operating experience, the following qualifications ore necessary: BTEC National Diplomo or HNC/HND In o Telecommunications Electronics Engineering syllabus which must include radio communications modules. City and Guilds 777 fadvonced level), or MRGC. Preferred age range for experienced Radio Officers and for those who do not possess the full ronge of skills is 18.45. When your training is completed you can look forward to:

• Good career prospects • Competitive salaries • Varied work (opportunities for moves reviewed annually within the UK and overseas) • Generous leave allowance • Job Security • Noncontributory International HAM RADIO exhibition including the 44th Pension Scheme DARC Lake of Constance meeting. Training period: Between 29 and 52 weeks (depending on background and experience) Salary during training (£9757). On completion of training. salary is then performance related but will start al inclusive rate of £17,958. 25.-27.6.1993 Given normal progression, standard pay will be reached in 5 years. Currently Friedrichshafen Exhibition Grounds standard pay is: £22,378 Fri. and Sat., 9 — 18w, Sun. 9 — 16e GCHO Is an equal opportunity employer APPLICANTS MUST BE BRITISH NATIONALS Europe's top meeting place for HAM RADIO enthusiasts with

For further information and application form contact: the very best on offer from the radio, electronic and computer Recruitment Office, Room Al1108. OCHO Pours Road. Cheltenham, sectors. Over 130 exhibitors and visitors from over 30 Glos. GL52 5A..1 or telephone (0242) 232912 or 232913 countries. All completed forms must be received n the Recruitment Office by 9 July 1993. HAM RADIO 93 — an experience not to be missed! emeeeeeemmm mm eCHe ...... :'"

RADIO COMMUNICATION June 1993 83 WHEN IT'S DOWN TO THERE IS SIMPLY HIGH PERFORMANCE S.A.S. NO OTHER CHOICE! FROM 80M MONOBAND BEAMS TO 13CM LOOPS — WE OFFER THE CHOICE

M2 ENTERPRISES cushcrcrit 11WIld ill MIRAGE/Ktm 6M7 6m 7e1 Beam A4S .20 15.10m 4e1 Beam TH7DX 20-15-10m 7e1 Beam KT34 X A .20-15-10m 6e1 Beam 6M5 . 6m 5e1 Beam A3S 20-15-10m 3e1 Beam TH5DX 20-15-10m 5e1 Beam KT34A ..20-15-10m 401 Beam 2Mi8XXX 2m Mel Beam A3WS ...17-12m 3e Beam EXP14 20-15-10m 4e1 Beam 6M7 6m lei Beam 2m5wL 2m 17e1 Beam R7 40-10m ti;,,rd Vertical TH3JR 20-15-10m 3e1 Beam 6M5 6m 5e1 Beam 2M12 2m 12e1 Beam R5 20-10m yzw Vertical 2M16LBX 2m 16e1 Beam TH2mk2 20-15-10m 201 Beam EB144 2m Eggbeater AP8 80-10m Yery Vertical 2M13LBA 2m 13e1 Beam 432-13WL 70cm 39e1 Beam A50-5 6m 5 element Beam DX88 80-10m Vertical 2M22C 2m 11XY Oscar 432-9WL 70cm 28e1 Beam 1762 2m 1701 BOOrIlle 14AVO 40-10m Vertical 2M14C 2m 7XY Oscar EB432 .. 70cm Eggbeater 1382 2m 13e1 Boomer 66DX 6m 601 Beam 432-30 -----70cm 30e1 Beam 124 WE .2m 4e1 Boomer 640x 6m 4e1 Beam 23CM35. 23cm 3501 Beam ARX2B 2m Co-linear 435-40CX 70cm 20XY Oscar 2m2P 2m 2w Power Divider ARX450 70cm Co-linear ROTATORS 435-18C 70cm 9XY Oscar 2M4P 2m 4w Power Divider AR270 2m/70cm Vertical T2X Tailtwister Rotator 440-6 70cm 6471 Beam 70C m2P 70cm 2w P.Divider A430-11 70cm 1 101 Beam Ham1V rhe -classic" Rotator JV-6 6m 5dB Vertical 70CM4P 70cm 4w P.Divider LAC elnrng Arrester CD45 Medium duty Rotator VHF/UHF pre-amps also available 23CM4P 23cm 4w P.Divider

GEM QUAD MIRAGE AMPLIFIERS HEIL SOUND DOWN EAST GO-2-3 20-15-10m 2e1 Quad A1015G uni 10-150w WI ix Hm-lo Boom/Desk microphone MICROWAVE GO-3-3 20-15-10m 3e1 Quad B23G 2m 2-30w gft rx BM-to Lightweight headset B215G 2m 2-150w g/f rx HC4/5 Microphone Insert LOOP VAGI AND GO-4-3 20-15-10m 4e1 Quad B108G 2m 10-80w g/1 rx B1016G 2m 10-160w g/1 rx TRANSVERTER KITS 17 & 12m Add-on kits THE ULTIMATE IN SSB B2516G 2m 25-160w g/1 rx FOR 13 AND 23cm, and also available. D15N 70cm 2-20w SPEECH ARTICULATION" D26N .. 70cm 2-60w much more. 15-12-10m "MINI QUAD" D1010N 70cm 10-100w Please ask tor delailsol the lull range available soon 03010N 70cm 30-100w of Heil Products Please ask for full details.

THE ABOVE ARE SOME OF OUR MORE POPULAR LINES. PLEASE SEND SAE FOR FULL DETAILS TEL: 0691 670440 SPECIALIST ANTENNA SYSTEMS LTD FAX: 0691 670282 TREFONEN, OSWESTRY, 'SHROPSHIRE SY10 9DJ.

McKNIGHT QUARTZ CRYSTALS e\t' GET GOING FIVE DAY SERVICE: £5.75 per crystal ,3\0› up to 70MHz, inclusive of p&p and VAT ON SSTV NOW! (minimum order charge £10). PC SSTV Ver. 5.0

Images Can be received and transmitted SAME DAY SERVICE: £14.00 per crystal It is easy to in monochrome or colour. Supports receive and ROBOT. SCOTTIE, MARTIN and AVT up to 70MHz, inclusive of p&p and VAT modes. Image resolution in VGA or transmit SVGA up to 640x480x256. Received and (no minimum order charge). Orders received before transmitted images can be converted SSTV images from .PCX or .GIF formats. Tuning 10.00am can be despatched on the same day. oscilloscope. noise smoothing, saving on your own to disk, printing and editing for new formats are some of its features OVER 70 MHz SERVICE PC! £158.80 AX only £99 inc VAT P&P £3.25 Higher frequencies ore available, call for pricing. PC HF FAX Ver. 6.0 RECEIVE AND TRANSMIT FAX IMAGES 230 Page manual with Worldwide lrequency ana schedule list. Integrated online Fax Broadcast schedule with multiple search fields. Support for Super VGA as well as Hercules, GA, EGA, VGA VISA, ACCESS and LCD displays. Standard capture resolution of 640x800x16, with VGA and EMS images as large as 1280x800x256 levels are OR CASH WITH ORDER saved. Display in Black/White, Monochrome Greyscale, Blue/Grey. Colour or User Programmable Colour_ TX/AX £176.13, AX only £116.33 inc VAT P&P £3.25 TEL 0703 848961 PC GOES/WEFAX Ver. 3.3

RECEPTION OF BOTH FAX AND SATELLITE IMAGES In FAX mode it will display weather charts, rebroadcast satellite images, press and amateur transmissions. In Satellite mode it will capture images from both Meteosat and all Polar Orbiting satellites. £199.00 inc VAT P&P £3.25 McKnight Fordahl COMAR ELECTRONICS UNIT 10, SAMUEL WHITES ESTATE, MEDINA ROAD, M(Knight Fordahl Ltd, Fkedley Ind Estate, Hythe, Southampton SO4 6ZT CO WES, ISLE OF WIGHT, P031 7LP TEL: 0983 200308 FAX: 0983 280402

84 RADIO COMMUNICATION June 1993 Members' Advertisements

RSGB Members wishing to place an advertisement in this section must use the official lorm credit card payment, cheque or postal order made payable to the Radio Society of Great incorporated on the label carrier of Radio Communication. This will prove membership and Britain. Please note that because this is a subsidised service to members, no correspondence must be for the current month. No acknowledgment will be sent. Ads not clearly worded, or can be entered into. Licensed members are asked to use their callsrgn and OTHR, provided which do not comply with these conditions will be returned. II an ad is cancelled no refund will their address in the current edition of the RSGB Amateur Callbook is correct. RS members will be duo. An advertisement longer than 60 words will be charged pro rata. Trade or business have to provide their name and address or telephone number. Please include your town and ads, even from members, will not be accepted. Traders who wish to use this facility must send phone number in the free boxes provided to assist readers. Advertisements will be placed in a signed declaration that the dens for salo are part of, or intended for. their own personal the first available edition of Raorom. amateur station. The RSGB reserves the right to refuse ads, and accepis no responsibility for Warning: Members are advised to ensure that the equipment they intend to purchase is nor errors or omissions, or for the quality of goods for sale or exchange. Ads for CB equipment will subject to a current hire purchase agreement. The 'purchase' el goods legally owned by a not be accepted. Each advertisement must be accompanied by the correct remittance, ase finance company could result in the 'purchaser' losing both the goods and the cash paid.

WEL2 CH20A Antenna Co-ax Switch (new): GESTETNEC Electrical Duplicator type 1560, TEN-TEC Century-22 CW Ten mmac, boxed: £19. JVC CX60GB 6inch TV/Monitor (mini): complete with manual and three drawer cabi- £200. Datong Morse Tutor. £40. SSMZ-maldt: £145. Wood and Douglas 1250 200mW/1W FOR SALE net: £75. In good working order. Buyer col- £40. Coder AT5 with mains PSU: £20. Ven- 23cm Ampliter £46. 3 Meter FSJ50 Flexible lects. GOFOT, OTHR. (Enfield) 081 440 2394 ous Homebrew ORP Tens/Test gear. Phone Hebei( plus 4 connectors(male) (new): £35. "SAILOR" Manne Equipment, Receiver. Exiter. for details. 12v/4A PSU: £10. Magazines, Tel: Paul, G4XHF.CITHR. evening. (Crawley) Amplifier, Power Supply and charger. Com- KANTRONICS Data engine 1200130 x2. books, valves, etc. G4BZI, OTHR. (Chester) 0293 515201. plete with all connections and Cabinet also 9600BD x 1 with developers Tootle's. com- 0244 351357. COMPLETE CAMERAoutfil Vivrier V20C/0 SLR Redden Manne Tx type G474 and Sall MF Tx plete: £325. 04-10 Data Radio: £300. 08400 28-70mm Zoom. Optomax 2.8 135mm. typo MT430B. Ail in good condx. Offers. Into. HF Vertical Aerial with 12m + 17m coils, new TENNAMAST 35 feet Wind Up and titterer Tamron 2s 7e1 Converter. All cases. High G4ZCN. QTHR. (Hartlepool) 0429 275571. in onginal packing: £50.1com IC901 2m/70cm Mast with friction break winch and g rou nd post spec Double Flash Unit, Pullman holdall plus Tc-vr with 111129 23cm Module. EX766 Fibre- plus head unit, all ex condx: £200. Commo- load accessories. exceptional condition, less dore 64 computer with latest disk drive and ALINCO 2 metro Mobile DR112, almost new. optic Remote control pack: £700 ono. 2m1 than hall cost. Price: £165 one Tripod in- plenty of Amateur software As new: £150 25/5W. with mobile Ma g-mount Antenna: £125. 70cm Diptexer £10 (Leeds) 0532 390054. cluded also available Weston Master two and ono. No time wasters please. Phono after G Foote, G7NCR (Didcot. Oxon) 0235 Invercone £25. Most items boxed. Minimal 816958. KENWOOD R5000 Receiver, mint condition 5.30pm (Wolvertiampton) 0902 664462. use for two years, (SE London) 081 857 8096. fated with VS1 Synthesiser and VC20 con- CUSHCRAFT R5 in nearly new condx. works verter £625. TONO 89100 AMT0F1 CW/FITTY etc, word very well: £165. (Southend, Essex) 0702 ANTENNAS for Sale: Hokushin HS-WX1 2m/ KENWOOD TS680S HF + 6M, mint. cew Mic. processor, keyboard. monitor temVunit: £350. 712775. 70cm Collinear £40. Cushcratt 2m Boomer or Exc ORP Tm, ATU etc. Standard 8800 2m 4218XL 18 ele 17.2dBd gain Beam: £70. Marchwcod 30A P/S, service manual arid DATONG D70 Morse Tutor, mint cond, boxed: Tm, mobile bracket. magrnount Ant £160. Tonna 13 ele 2m Beam: £25. Alters! class boxes. Will Include 201 6M Beam: £725. £45 ono. 60101. OTHR. (London) 071 704 G4GRU, OTHR. (Manchester) 061 440 0556. Eurosonic Fwd/Rev SWR meter: £5. Swop or concis. Buyer collects G1XFG, 6-9pm. 1078 evening. pan exc All for FTIOIZD ono. John, G4NEN. (Doncaster) 0302 786999, DATONG FL3 or Fl..2 and VLF. Also Racal MAGNETIC LOOPS Capco AMATAMA5 3.5- OTHR. (Lanes) 0524 62734. Rein RA17 type. Within 50 miles of Hull_ 30Mhz Inc WARC, Control box and cabling. Please ring. (Hull) 0482 708407. ASIATIC 0104 Base Mike: £50. teem 22811 cost £800+. No ATU, no tvi. no planning 35FT BOX Section Mast as new, never used: 50W, boom Mike with T/bu rst: £250. Standard DATONG Morse Tutor boxed: £35. Commadore permission required, 3.5-11Mhz: £220. 13.9- £250 ovno. Buyer Collects. (Durham) 091 373 C150E 2 mirs Ft/held, charger '.extras: £175. 64 with Morse Tutor and Decoder. boxed. 30Mhz: £180. The Pair: £375. Could deliver. 4459. Kenwood MC80 Base Mike: £40 All in good £60. RFIC full RAE course with answers: £35. Olympia Electronic Typewriter, spare nbbons. 3511CRANK and Tilt Tower HiEtrew: £105 ono. (Liverpool) 051 734 0328. condition. Phone (Wembley, Middlesex) day PF 15,3 trans. 7 Receivers, Xtals, batteries. various typefaces, 5 reams paper, manual, DEE-COMM 3 Band HF Vert Antenna, minimal 0992 624429 or evening 081 904 3282. Night call units x 2: £40 ono. (Tamworth) 0827 excl condition, bargain: £125. John, GOOAF. use. mint condx, very well made. £65. To 284184. (Derby) 0332 677017. include Interlink delivery. GW4RLP, OTHR. BRAND NEW boxed Valves. all £3 each: 50 YEARS of RadCom(1942-1992) plus (Caernarfon) 0286 675264. 12BH7, 5763. 6AS7G, 5R4GY. 5U4G. 6P25. SWM(1950s-1980s) plus Radio Constructor. R5 HF Vertical 20. 17, 15, 12 and 10. Used but DRAKE SP R4. good condx: £150. ERA Micra 6080. AC/P, 063. 01-163. EF5tV55, E1128. HAT. also various old handbooks (ARRL 1936. Mire: £185 inc carriage. Phone (Edingburgh) reader as new: £70. Buyer collects. G3JLB. GZ32/34, H63. KT33C, KiW61/2/3, KT81. 031 346 0591 evenings. RSGB 1940): £100 the lot plus donation to- 003, PL38, P1504/509, PY500(A), P0500/ wards carriage! May sell some separately. OTHR. (Gravesend) 0474 534694. DRAKE 1117, RV7, PS7, 7077 Mic, all fillers 510. SP41/81, 3A/167M, E1360. 5N180M. R7000 mint with TV cony: £690. Trio TS930 Ring for details. G41.10. (Middlesbrough) 0642 lined. workshop manual: £650. Yaesu F1102. 613K4, 1124, UU8, KT67, N78, 807, DM70, AATU: £630. Kenwood 70cm TH45E + acces- 318237, T41, 7475. Several available each type. Please all filters: £495. All good condition. sories. mint: £220 ono. (Ipswich) 0473311665 6M AKD TRX for sale. Ideal for ORP or Novice add £2 Postage. Cheques lo:- Mr K Bailey, 40 (Trowbridge) 0225 753166. after 7pm. use. Aerial included. Still boxed with manual: Seymour Close. Sally Park. Birmingham. 529 £115. (Preston) 0772 743801. EDDYSTONE Receiver EC10: £75. 770/R. 770U/2, 730/4: £95 each. Cash plus carriage. 7JD. SILENT KEY 630V.1. Yaesu FT747GX 160- ALINCO DJ180 2m H/held as new. boxed: All in vgc. Contact Lepino. FAX 0372 454381. 10m General Coverage Receiver 0.1 £155. G7NTG. (Kettering, Northants) 0536 (Great Beckham) 0374 128170. BRAND NEW Valves. All: £1 each. DAF91. 29.9Mhz: £800 ono. Matching 20 Amp PSU: 521718. EXPLORER 14 Hy-Gain HF Tribandor Beam. DK91, DF96, EB91, EL81/85. ECC81/2/4. £50. As new in original cartons. G3MYE. AMSTRAD 1640 Computer, enhanced colour 12 mths use, very good condx, dismantled EF80/85/91, EF95/42, EF183/184. EBC90/ OTHR. (Banbury) 0295 78331. Display Monitor, 20Mb hard Drive. word proc- 81, El3F80/90, ECL83/4/5/6, ECH84. EH90. essor, log book program, spread sheet. and boxed ready to go: £250. 04ZZN. OTHR. (London) 081 850 1440. EZ81, 12AT6. 12K7GT, 12SC7. 12507.2011. SILENT KEY Sale, GW2FWD. Boxed equip- propagation programme, packet programmes. 20P UPS, 30C1 • 30C15, 30C17, 30C18, 30F5. ment, GWO as seen. GW3BAZ will demo. All installed on hard disk. Buyer inspects and FREE 60toot Versatower 20m Quad and rota- 30FL 1. 30FL 12. 30FL14. 30FL2,30LI. 301-15. teem 1C740 100W HF: £375. Yaesu F1747 collects. First offer of: £550 cash secures tor if you purchase 3 Bedroorned House near 30L17, 30P12, 30P16. 30P18. Assorted re- 100W HF: £365. Kenwood TM241E 2m Mo- Soltware manuals. Stuart. GMOCAO. Mold. N Wales. Easy access to coast, Ches- ter, Liverpool, Manchester. Located mid ter- sistors 400+: £1. Assorted transistors 100+: bile: £210. (coin IC PS15 20 amp Supply suits (Macduff) 0261 33298. race block of 4, gas elk dig'. car parking. £4. P&P: £2.50. Cheques to:- K Bailey. 40 above: £60. Kenwood TH25E Hiheld 2m, ex- • ANTENNAS 19 element 70cm. £25. 17 ele- Seymour Close, Birmingham 029 7.10. tras: £120. Sony ICF 7600DS synthesised VHF ment 144Mhz: £35. 5 element 50Mhz: £30. All 160011 fully insulated shack/workshop. Ex- cottont order throughout. Photos available FM Broadcast Shortwave to 30M hz: £55. SAE by Tonna. Spectrum Plus 3 with Morse Tutor: COULD Probably make the best DX 0TH In the for list. Cheaper items: rotators, antennas, £60. Datong Morse Tutor: £45. G I IYC. £44950. (Mold) 0352 771520. South of England. Situated on top Chiltern testsets. SWR. switches etc. (Cardiff) 0222 (Doncaster) 0302 724509. FT101E +FM module. Ian, excellent condition, Hills 650 ft ASL near Henley-on-Thames. 757556. AOR AM MO Portable Receiver still under boxed, manual: £295. FRG7 General Cover- Spacious Bungalow in quiet village, compris- warranty. AC chgr, Nicads. 12v DC lead, soft age Receiver, manual, excellent condition: ing 3 Bedrooms, sitting, dinning rooms mod- SILENT KEY Sale. Comms Receiver 'cam case. earphones. AM-FM(N). Ffi4(/V). SSB: £150. G4TC1.(Kingswinford) 0384 279769. em fitted kitchen. Large back garden backing ICR70: £450 or offer mint Yaesu FRV7700 £250 (Kent) 0474 823797. F1290+ Batts charger, case. remote Mike. Part on to common. Price: c.£95000. For further Convertor FRT7700 Antenna Tuner: £50 each ATARI STE Morse RTTY Transcoivo: £5 each . Exchange for 2mtr 1-1/held or £225. 18 ele 2m particulars phone. (Clydebank) 0389 73741. or Offers. Contact GOPCY. OTHR (Surbiton, Mr V McClure, 43 Roman Way. Seaton, Devon Beam + Rotator. £40. Farnoll Dual Beam surrey) 081 397 2542. EX12 2NT. (Seaton) 0297 23421. Oscilloscope with probes, book, vgc: £40. FOR SALE owing to 100db loss of Fleeting, AVM Mk5 Multimeler and weather caul, with Buyer to Collect/examine, pay carrage. going ORT. TenTec Omni 4 Oskor VSWR STANDARD AX700 Scanner(Panoramic dis- new batteries. Offers over £30 Please. Dave. G4BNH. OTHR. (Shipley) 0274 593153. Atten switch. 100W load: £375 ono. BBC B play), little used: £360 Miracom WS4000 (Abingdon) 0235 526543. F169011 50 Mhz 2.5w M/mode Portable Tx/Rx series7, sideways RariVEprorn Board, 5.5 modem CV2123: £25(new cost £125). loam BBC B Viglen Case. 40/80T floppy. Wallord givo, but case scratched, hence only: £175. Drive. Hires Mono, Printer: £165 ono. Philco IC255 144Mhz: £50. Kit built Airband Ax: £20. sideways Rom board. Green Monitor, menu. Would Px towards HF buRx. Sextet Modem VSWR/Power Meter 25mHz-1000Mhz WANTED: EC10 mk2. (641.1F, shack clear- fits, software: £200. Watford sideways Rom V21 to V32019 with MNP4/5 and V42N42BIS: Milliwatt Kilowatts ESO 1,08:1 VSWR: £135 ance 1993) (IpswichVColchester) 0208396610. board: £30. UDM ADFS board: £20. BBC 8 £80 or Swap 2m or 70cm FM Tx/Flx, Epsom one 10Hz/lMhz Ma rconi Oscillator: £15. 150W faulty for spares: £30. Epson MX20 Portable RX8OFT Printer 9pin Dot Matrix with friction 220Mhz Signal Generator £35. Boxes of Co- STRUMECH 75 Feet HiD Mast with 4 ele HF Computer cAv Printer. tape drive. TV adaptor. and tractor lead: £80 or swap 2m or 70cm FM Tx/Ax. Mike. G4KFK. (Slough) 0753 540520. Axialconnoctors and adaptors from 25p each. Beam 1648 Ham Shack, lovely 4 Bedroom handbooks, technical manual, software: £200, (Wheathampstead) 0727 862743. old Farm House. 6 Acres outbuildings, lovely GM6AMP, OTHR. (Glasgow) 041 422 1175 GEC Army Tx1FIx RT264A. covers 1010- views over farm lands. Close A34 d M4. only: BBC 13, 40+ games, recorder. B/W 14Inch TV 1110Mhz. contains 3x 2C39A. 115v supply. FRG8800 Receiver 150Khz to 30Mhz HF. 118- £2651. G4GVE, OTHR. (Newbury) 0635 Tho lot: £95. No Offers, Also Microwave Mod- £40. 20inch B/W Video Monitor £20. D14/ 174Mhz VHF, complete with manual, original 201533. ule MM70/144 Transverter as new: £65. No 18101-1 CRT: £5. (Alf reton, Derby) 0773 packing, plus Discone antenna VHF. Excel- otters please. Prefer buyer collects or car. 831562. lent condx £450. G3CGO, OTHR (Luton) TATUNG EINSTEINCornputer, CPM, twin Disk nage extra. G1 EYL, OTHR. Or phone GENERATOR Kawasaki GD700AS 240 VAC 0582 25519. drives, 80 Column card. colour Monitor. Printer (Dronfield) 0246 415667 after 5.30pm. 2.5A. 12VDC 8.5A. very Portable, electric lead, software, cover. All manuals and original BBC MASTER 128, Monitor, disk drive, Printer, starter, unleaded petrol. One year old. Immac: FT225RD MuTek front end, boxed, manual. packing: £150. Yaesu FT23 2m Hfield, with manuals, various software. Inspect and col. £350. Buyer collects. Yaesu FT101Z0 Mk3, Base Mike: £500 ono. DR49 Panasonic Mobile PSU. Mic and earpiece. dry cell case. lect: £350. G4URJ. (Hindhead) 0428 605501. FM, WARC, VGC, GWO, with Fan and work- Corms Rs AM/FM/SSB all HF bands: £230. carry case: £125. (Manchester)0942876796. COMMODORE 64. 1541 Disk drive, Da tasetts, shopmanual. £380. Nooffers. George. G4RNI. 30 foot Tower, never used, with winch, cables, 1525 Graphics Printer. Joystick, mouse, all (Gateshead) 091 438 5375. rotator cage hltover base mount included: TRIO TR950070cm M/mode, manual, memory books: £145. Shure 444 Mic: £20. Pair 813$: GOOD DX 0TH, WAC(50Mhz), 3-Bedroom £300. G7BPR, OTHR. Saleforced by Ill health, back-up. 9 element Tonne, mint condition, £35. G4CJY, OTHR. (High Wycombe) 0494 Terraced House in Grays. Essex. Central no time wasters Please. (Boston, Lines) 0205 any Mal: £325. G6E81. OTHR (Hornchurch) 530018.EASY saPC PCB Drawing package healing, partial double glazing. quiet road, 79620 0708 553495 plus Library symbols: £60. Black Star Orion close to all amenities and convenient for Lon- PALNideo Colour Pattern Generator: £148. don and M25. 40 foot Telmer Tonnamast

RADIO COMMUNICATION June 1993 85 MEMBERS' ADVERTISEMENTS

Tower to remain: £47500. G6CR X, KENWOODTR751E 2m Multimode, absolutely PK232 Mularnode Data controller as new, exc old, under warranty. absolutely as now con* OTHR.(Grays) 0375 384179. immaculate, never used mobile: £495. Con- condx. with loads and manual plus Pkfax bargain al: £300. No Offers. (Guisborough) HAMMERLUND H0170 Receiver. Hallicrafter sider Exchange with Kenwood TS790E plus software: £250 ono. Phono Steve after 7pm. 0287 652822. S27 Receiver. Murphy A4(sIn 7719) Radio. cash adjustment. GORAN. OTHR. (Bury) 061 (Altrincham, Cheshire) 061 980 5506. SURPLUS to Requirements. Power Splitters Price and Details 0TH. (Isle of Man) 0624 796 5296. POLYSKOP Rhode & Schwarz complete with 70cm Professional Ouality, machined from 621720. KEN WOOD TR751E Mullimode: £400. operating table, detailed handbook, ratings. solid aluminium. Completely sealed with solid HEATHER LITE Hunter Linear Amp, handbook, Kenwood AT230 ATU: £150. Yaesu FT470 adapters, diode probes. Buyer must inspect dielectric and 14" type sockets. Two Port, boxed: £750. Tennemast telescopic. foldover 2m/70cm: £225. Tno TR7730 2m: £100. before collecting: £250. Phone any time. ideal for circular polarisation of crossed Vagis: £300. Yaesu 6600 Rotator, controller, 75ft Kantronics Linear 2m 2-30: £80. Diamond G3DVV, OTHR, (Chipping Norton) 0608 £37. Four Pon: £46. GOBGN, OTHR. multicore cable: £150. All as new, silent key X50 2m/70cm Antenna: £30. Kenwood MC85 644371. (Bakewell) 0629 813369, sale. Buyer collects. LAR omni match: £12. Desk Mike - £40. Diamond SX1000: £70. All PYE MOBILE Radio Equipment Comprising TEN-TEC Paragon with all CW fitters. FM. TS9130 gdo mobile mount. Mic, boxed: £300. Ex Conde and boxed. (Derby) 0332 44979. one Reporter MF6AM, one M293, two West- Voice module. matching PSU, also 2kw ATU. G4GBN (Yeovil) 0935 862505. KENWOOD TS120S HF Tcvr, matching VFO minster W30AM and one F30 Basestation. All Boxed, manual. Immac: £1275. Dave. G3RCO. HEATHK1T HW101 I-IF Tvcr complete with 120, ext Speaker. PS30 PSU and MC50 Mk: Low Band AM. Good condition, offers. Also (Romford) 0708 374 043. Power supply. Microphone and manuals. good £350. Kenwood ATU230: £110. GMORDA. Eddystone 840C vgc: £75 (West Glamorgan) TENNAMAST 35' Till Over hilly galvanised: condition: £150. Call Standford, GOJIZOTHR. OTHR. (Bumtisland) 0592 872858. Tel 0267 233481 x1422 day or 0646 692688 £275. G600ORC Rotator complete. £75. Both (Great Yarmouth) 0493 780579. KEN WOOD TS130V, VF0120 ideal ORP Sta. evening. vgc. GOPDM. Not OTHR. (Southend-on-Sea) Hal MINIBEAM. £75. FT290R: £245. Daiwa lion, plus Yeasu FL110 100W Linear used 0TH FOUR Bedroom Detached. double Ga- 0702 299348. LA206 2m linear: £75. Mutex SLNA 2m Pre- Mobile successfully: £280 ono. Yeasu rage. aperos Quarter Acre. 3011 Tower 10/ TENTEC PARAGON Tow, excellent condition amp: £25. 144/9 Yagi + AR30 Rotator: £75. FRT7700 Re ATU: MCI G3ELH, OTHR. 5m Ouad Room for 20011 wire.(300+ coun- with fitters 6kHz, 2.4kHz, 1.8kHz. 500Hz and ICO2E 2m Efiheld: £125. BBC-D issue 7, (Peterslield) 0730 264971 tries confirmed). Offers around: £175.000. 250Hz. Superb performance. Requires VCO DFS8271 rintenvercl +GX2 FAX/SSTV, high KEN WOOD TS140S HF Tow, all bands, Gon G3PLP, OTHR. (Solihull) 021 706 0759. adjustment. £595. 6513M. OTHR. (Newent. resolution Monitor +Sollware: £385. coverage receive. Boxed, hardly used, never RACAL 9082 Signal Generator good order Gies) 0531 820960. Won:Wise-Plus: £40. TX3 FAX/SSTV TX/Ma, mobile: £575. GOMZI, OTHR. (Battey) 0924 1.5-520Mhz AM/FM synthesised: £450 TOKYO HI Power HL180V 2m Linear, 6 months Mel Interface. Spectrum+ Alphacom Printer 474548. Schlumberger Variable Attenuaior 1 to 40db old. £225. AMT3 AMTOR/RTTY Terminal, +FAX3/SSTV+Interface: £95. G4KTX,OTHR. KEN WOOD TS440S with Auto ATU, boxed in 1db Steps: £28. G4AJE 6-8pm. (March, IBM-PC software: £90 (Bideford. Devon) 0237 (Chelmslord) 0243 33233. and in pristine condition. Inspection welcome. Carnbs) 0354 741168. 451065. HRO Mint un-modifed c/w PS. ETC 1945. Col- £8300n0. G4WOL.OTHR. (Nr Redruth) 0209 REALISTIC 10m Mono Ba nd Mobile Tcv r. USA TOKYO HyPower 70cms 100w PA. preempt lectors item: £150. AlsoCandlestick Telephone 890450 evenings. import. Not CB converted 5-251N, ex conde metered: £215. BNOS 13.8v/25A Metered very old: £50. Peter. (Guisborough) 0287 KENW000 TS440S with Internal eu and £165 ono. (Bracknell) 0344 486625.. PSU: £130. Panasonic Al Video Camera/psu 634397 daytime 9-5. filters YK88CN and YK88C. Fitted with PS430. ROBOT 400 BiW SSTV 8/16 sec send and (mint): £55. Paradise PC VGA Card: £25. HYGAIN TH2 Mk3 2 el Beam, dismantled, vgc. Mint condx all boxed: £950 ovno. (0swestry) receive, with Monitor and manual. glc: £150 Tonne 23cms 2way aerial Splitter: £20. Welz Prefer buyer to collect. Norman, G4RYS, 0691 657698. ono. Robot 800 keyboard for SSTV. text, CH20A Coax Switch (2way): £20. (new) Sony OTHR. (Leeds) 0532 663846. KEN WOOD TS790E 2/70 Multimode TCVR, RTTY and CW send and receive with Monitor SLV353VB VCR: £185. (new) Black Star Video HYGAIN Vertical 12AVO 20-15-10 metres. 13.5 PS31 PSU, SP31 Loudspeaker, MC60A Mi- and manual, g/c: £150 ono. (Cheney) 0257 Patem generator, multi output: £145. Must h, boxed, unused: £50, cost £99. Two Metre 4 crophone All vgc: £1250. G6DBX, OTHR. 273976. sell everything. Tel: Paul. G4XHF. OTHR. elem Beam: £12.50. Microwave Modules Phone evenings before 9prn (West Sussex). RTTY/CW Set-uP Compnsing TX-3, 11F1, BBC- evenings. (Crawley) 0293 515201. Morse keyboard MM1001KB sends Morse, 0444 248767 B. 8271 DFS, 0/drive. All boxed: £195. Mint TONO 9000E Communications terminal FITT?. lour butlers: £45. cost £120. Microwave Mod- KENWOOD TS850S Auto ATU, 500Hz Cw boxed BBC-B:100. Games Joystick: £15. Keith, ASCII, CW, Word Processor. including VDU: ules Morse talker MMS-1: £75. VHS Video fitter, Mic, as new: £1200. PS52 Matching GOOZK. (Stockport) 061 477 5303. £300. GONX X, OTHR. (Scarborough) 0723 tapes, top quality, used once, E240 x3, E180 PSU: £150. TenTec Corsair 21. MC: £700 NY0 Systems Computer M8C25-+ 286. 43Mb 584405. x10, E150 xl, E120 xl.G31J1_16 Bloemfontein TS520. 250Hz CW filter: £300. Cushcrah A4 hard Drive, 1.44Mb Floppy, Maths Co-Pro, TRIO 830S Transceiver: £575. Yaesu Linear Avenue, Shepherds Bush, London. W12 7BL. 4 el HF TriBander £180. Yaesu FC102 1KW software, handbooks etc, as new. First rea- FL210013; £375. Microreader Mkt wit Tutor. (London) 081 749 1454. HFATU: £180.1com1C2102m FM Homebase sonable offer. Telewave Model 44A In-Line £78.1C24D VHF F M Transceiver: £88. Heathkit ICOM 726 6m MF AM/FM lilted, [corn P515 1-10w, Desk Mie: £180. Yaesu G400 Rotor Wattmeter 20Mhz to 1Ghz. Five ranges 5/500 1-1W2022m Tcvrand Healhkit HVY202-1 Power 20A PSU. Sem Zmatch ATU. Butternut HF6V- with 20m cable: £50. Owner gone ORT. watts. 'N' type connectors: £60. Prefer pur- supply: £80. (Isle of Man) 0624 621720. X, MFJ 1274 TNC 2, Boxes. Instructions. (Falkirk) 0324 32594. chaser inspect/collect. (Bransgore) 0425 TRIO 830S, Yaesu FT227, two headphones. Offers? (Newbury) 0635 200108. KENWOOD TS930S 9-Band HF TCVR. Pris- 479226. two Power Supplies, The filter Eli. Howes 7 ICOM IC-R7000, absolutely pristine condx and tine condx. Fitted 6Khz and 270Hz filters, with SB200 LINEAR: £350 ono. Dig! View Gold mtr mic 353. Ant's, RadComs. Close down of boxed: £570. Would Exchange for Kenwood Hand Mic, manual and box: rm. Also AT230 Digitiser for Amiga computer: £50. Navtex shack 84 yrs. Many odds. No offers. (Birming- TS440S or similar. Must be mint and boxed. HF 9-Band ATU. Excellent condx. boxed: Active Rs Antenna: £25. (GOBVS. (Bedworlh) ham) 021 357 2009. (Aberdeen) 0224 649451. £150. Ring (Cheshire) 0606 554178 anytime.. 0203 490483. TRIO R2000 Receiver with VHF Convertor and ICOM IC-W2E 2m/70cm H/held, hardly used, KR 500 Ele Rotator and controller: £100. N. SEXTET MODEM V21, V22, V22BIS, V23, CW later £250. AKD6001 6Mtr FM Tee exc condx, with charger and a speaker Mike: type 2 way power spline': £25. CMOS Memory V32. V32BIS. V42. V42BIS, MNP4/5, Hayes/ £100. Cushcratt R7 Multiband Vertical as new: £360 ono. First to see will buy. Stove alter Keyer £50. FL3 Fitter: £85. (EpSom) 0372 AT. Auloanswer and Autodial. 81 approved . £275. Cushcraft D3 10. 15. 20 Mtr Dipole: 7pm. (Altrincham. Cheshire) 061 980 5506. 742476. £80 ono. Will Swap 2m or 70cm FM Tx/Mx. H/ £100. Yaesu FRG965 VHF/UHF Re 60- ICOM ICO2E with case, charging lead, charger, KW2000E TCVR with PSU. also Mobile PSU held Scanner lOchan, Xtalled RO and R7: £20 930Mhz no manual hence: £200. Tokyo 50Mhz etc. In good clean condition and in original and spare valves, manuals, No /Ale: £160. Ono. Mike, G4KFK. (Slough) 0753 540 520. Linear 10w in, 50-60w out: £70. (AshIon-u- packing: £190. G4LUF, OTHR. (Totnes, Buyer collect. (Manchester) 061 794 8804. SHACK Clearance. All Items plus Postage. Lyne) 061 308 2277. Devon) 054 882442 evening. LATTICE TOWER Sections 13 inch Triangular Timestep PC-SAT3 WXSAT/Rx System: £35. TRIO SM220 Station Monitor with Band Scope, ICOM IC251E 2m Multimode Transceiver. £350. by 13 feet. Three available, buyer must col- Maplin Wesel Receiver. cased: £35. ERA mint with handbook, boxed: £375. loom IC251E Alineo DR1102m FM Mobile Transceiver 45w lect: £60. High Voltage Capacitors. Oil filled, Microreader: £75. Phillips 12inch Monitor: £45 Maimed°. Mutek front end. mains and 12v output: £170. Both Boxed, vgc. (Worthing) suitable for ORO power supplies. 1 Omfc 10Kv DX- Edge Software: £10. Dipole/Delight MP3 5/ leads, handbook and circuit. Buyer Collects: 0903 262129. working Orate Largella, several available: 7 Plus MP 7/28: £25 each. ST5C Terminal: £375. saORDOS6 original 5.25 inch Disks ICOM IC2SA 2m Walkie-Talkie Radio, meas- £15 each. G3XBN, 0714R. (Brighton) 0903 £35 Spectrum 128K. Int/face 1, Microdrive: plus 3.5 Inch if required, handbooks, unregis- ures only 2.5inch high x 2inch wide, with fast 834904 day time, 0273 557766 evenings. £40. Prism VTX500 Modem - £10. Tascopy for tered: £35. GW3ECH. (Brecon) 0874 84266. charger. batlehes not so cherry, hence only: LINN AXIS Turntable with Beek tonearm. Free Spectrum: £10. Complete Spectrum Book: TRIO TS120V Inc Spkr: £220. TL120: £180. £160. (Hall price) loom IC228E 2m 25w Tog: Mc cartridge. vgc: £250. Also Sony Walkman- £5. Linguaphone Spanish course: £30. 1991 PS30: £80. All as new in original packing. Also £160 (WIB receive). Scanner MVT7000: £260 Pro WM-D6C Portable Cassette Recorder. International Call Book: £5. GOKTN, OTHR. Mike and LPF, Offers? (Northwich) 0606 1001-Ix up to 1.3Ghz. G4MVL. (Nuneaton) vgc: £150. (Rugeley) 0889 583692. (Melksham) 0225 703726. 888680. 0827 713652. MFJ949C De-Luxe Versa Tuner, twin needle SHACK CLEAROUT. Racal RA171.: £150. TRIO TS711E 2m Manode 25W Base station. ICOM IC725, HM12 Mic. AM/FM board. 5001-1z meter. 300 watt Dummy Load: £85. TrioJR310 Monochrome CCTV Camera: £30. Bird 43 AC/DC with DCS, 40 memories, voice synthe- CW filter: £480. Ted, GOLMJ, OTHR 1.8-30Mhz Receiver as new: £125. G3FCV. (meter u./s): £25. AEL HF (2-22MHz) SSB sizer. Mike, box and manual. Excellent Condi- (Hof/Image) 0507 588219. OTHR. (Gillingham. Kent) 0634 854682. Tevr 100W on 80m: £85. Jaybeam Rotary tion: £525. MC60A Desk Mike built in pre- ICOM IC745 with FM, perfect with box: £700 MICROVITEC Cub RGB Monitor. gwo: £55 Dipole for 10, 15, & 20m: £50. Mel 5 ete 6m amp: £40. G1VMT.(Broadstairs)0843 663445. ono. Part Ex with TS120S or 130S. GOIMK. each. Prefer Buyer collects. 40 ft Lattice Tower Beam: £40. Open to offers. Wanted 70/23cm TRIO TS830S, mint with deluxe tuning knob: (Glows Top) 0299 832279 daytime. £150 or if Buyer dismantles: £120. G88CA. Equipment. Phone Ian. 6-10pm or weekends £450. Akal GX-265D Auto reverse Reel to INSTRUMENTATION EIP 3510 18Ghz Fre- OTHFI. (Mildenhall) 0638 714051. only. (Gravesend) 0474 814809. Reel Stereo tape deck: £80. GOKDX. quency Counter Excellent with H/B: £400. MINIMITTER 80-10M1r Valve Converter (be- SILENT KEY (G1LYA). Yaesu FT48OR 2m1r (Standish) 0257 422547, Chris, G8JFJ. (Waterlooville) 0705 596836. lieve 4-6 IF), R1155 Hand Book. Class D M/mode, exc oondn: £240. Sony ICF2001D TS120V HF Tcvr, TL120 Linear, DFC230 Con- JAYBEAM Minimax MM3Tribander. 18 months Wavemeter Handbook. ARRL Handbooks Rcyr: £180. Also Sony AN-1 active Antenna: troller. All good condx, offers. Steve. GOEVJ. old and in ex con*. Ready to take away: 1957, 1986, 1987. ARRL Antenna Books 148 £30. Or both Items: £200. Virtually New HF Phone weekends, cash preferred. Inspect and £250. Phone Dave. GOJPL. (Wellingborough) 151h Editions. Will accept any reasonable Linear 3-32Mhz B/band. 4-7W input 100W collect. (Lichfield) 0543 251915. 0933 222472. offer plus Postage. GOKTN, OTHR. out. PrIknode: £45. Contact Gordon, G4PIF, TS520SE, boxed, manual, recently re-valved OTHR. (Sunderland) 091 528 4955. KANTRONICS Data Engine: £280. Yaesu (Melksham) 0225 703726. and serviced by prof essional: £300. Also MC50 F1707: £350. FC707 Antenna Tuner: £50. NATIONAL Panasonic Ton, solid state 100W, SILENT KEY Sale G4MKO. FT720 2 metre FM Desk Mic. as new: £30. GORUL. OTHR. (Mal- Datong Morse keyboard: £40. Pace 300 baud 9 bands, memories. comp 3 speed tuning: Mobile: £125. FT767GX +6 metres +2 metres: vern) 0684 572364. Prestel Modem: £100.4'19' Rack: £5. Ouinkey £350 or Exchange Argonaut 515/509. G3XKF £1200. FC901 ATU: £125. Tono RTTY Termi- TS950S mint, mike, manual, carton. Standby BBC B Keyboard: £10. Class D Wavemeter. (Bucks) 0296 614128. nal 0-9000E: £150. Daiwa 007011 Rotator: Tow, little used, lid never lilted. save £800, offers. Eddystone 990R Rx 25-250Mhz: £150. NAVAL Receivers. Marconi 828: £70. Rare £50. Stolle Rotator: £20. FT203R FM H/held: reluctant Sale: £1700. Johnson 1Kw Low- John. G3UUT, OTHR. (Cambridge) 0223 VLF Marconi B29. £100. Both GWO, VLF £100. Datong Morse Tutor. £40. G4UXC, pass Filter: £20. B&W 6-way Coaxial Switch: 843546. Receiver 047 less PS module: £80. Coverage OTHR. (Evesham) 0388 831508. £30. BC221AJ modulated charts, P/pack: £25. KENWOODTH26E 2m Wheld, mint condition, of both VLF 15-500KHz. US Navy Oscine- SILENT KEY Sale 134ZKL. Complete HF Sta- Claude-Lyons Variac: £40. Letters Only:- 71 boxed, loss than 12 months old, also battery scope AN/USM-38: £30. Army R107 Receiver tion FT707. FC700, FP707, FV707DM: £530. Lichfield Avenue, Evesham, WR11 5EB, box: £165 ono. (£200 il new). (Newcastle £35. Collins valved civil Aircraft Ax, Tx avail- FT208R: £110, FT230R: £ m. HAM-1 Re: UNIDEN 2830 Multimode 20w 10 metre Mo- upon Tyne) 091 2627532 able. (Button on Trent) 0283 44677. £55. 7Amp Power supply: £55. YM24A mike: bile, boxed as now, with Heatherlito mobile KENWOOD TM241E Mobile 2 Mtr Tow, ex- NAVICO 1000 2m FM, Heatherlite Mic. 5/8 £20. (Camberley) 0252 549898. Me: £150. Yoko Fl 5inch B7W DXTV. boxed, tended Receive coverage, PWR 5. 10. whip. gultermount; £125. Yaesu FT23OR 2m SILENT KEY Sale, GOGNB. Capeo Magnetic as new: £40. Carnage extra. G4KEL. (Taun- 50W, multifunction Mic, features inc DTSS, H/held, case, charger: £90. SX200 Scanner Loop 10, IS, 20m; £150. BNOS 2inlr Linear ton) 0823 332919. pager etc. Mont Conde £235. Also loom IC' AM/FM 26-88Mhz.108-180Mhz.380-514Mhz. 100w - £150. J-Beam 2m1r 4e1e Quad: £25. WORKING LUCAS freelite Wind charger with R7000 Comma Ax 25Mhz to 2000Mhz, Nint- charger: £75. Yaesu FT290R. case, charger: Aline° EL H260D Linear 2mtr 60W. £45. Daiwa control panel and 1511 wooden post. 12 volt. h Speech Synth. Tho No 1 All Mode scanning £230. Sharp Car Stereo radio cassette, speak- DP610 Digital SWR/PWR Meter: £90. 2intr Prop needs slight attention. Complete with Ra; £650. Phone G3IWE. (Warrington) 0925 ers: £40. Fuji SLR STX-1N Camera. extra 9e1 Portable Yagi: £25. All mint. GOOIG. OTHR original manual and propeller drawing: £150. 601485. 28mm Lens. case: £70 All ono. (Lichfield) (Maidenhead) 0628 25435. Buyer collects. 25ft Square section Sleet Mast KEN WOOD TM75E Dual Band Hiheld, ex- 0543 263919. SILENT KEY Sale. 3011 Altron Tower, 3 ele- plus sliding lit 2011 round section pole. A gift at tended receive, base charger. 2 Nicads and NAVICO APAR1000 2m Mobile: £135, Traps ment TET Tribander, Kenpro KR4OORC Rota- £20. G3CRH. (Lichfield) 0543686364. cases, etc coud, boxed: £280. Standard 7Mhz 1Kw (unused): £25 Tiny 2 W/PMS: £95.. tor. Buyer dismantles. collects £200 com- YAESUFLDX400 +FFIDX400 Tx +RX pair, gwo, C89002mtr FM Mobile lOwalts with mounting TH21E 2m Hiheld. VOX headset. Car DC plete. G40AA. OTHR. (Hoddesdon. Hens) wig boxes, manuals: £220. Extra Re: £110. All bracket. £100. G4NYZ. OTHR. (Redditch) converter £100. G3VWH, OTHR. (Shrews- 0992 464795. Three: less 10%. Comprehensive BBC-13 0527 545800. bury) 0743 365061. SAW KILLOWATT IF Linear Amp. 6 months Computer set-up. over £500 worth, circa: £350

86 RADIO COMMUNICATION June 1993 MEMBERS' ADVERTISEMENTS

or may consider ORP swap (Argosy II. F T77S BEARCAT UBC175XL circuit diagram or even RACAL lit, mint also Racal 1217 VGC, also +CW) or 2m Rig TR9130. Please collect! AP1086 Issue 1 (RAF Radio Stores Ref No's) copy of Service manual. Uniden PCB PH- REME Unit for aligning Racals includes Scope GOOZK. (Stockport) 061 477 5303. Also AU Publications relating to Radio, Radar 021AC. will copy or pay reasonable costs and Wobbulator. Best Offers, All with Manu- YAESU FRG8800: £350. VGC boxed, AR2200 equipment. Exc price olfered. Would purchase whatever G4EMM. NOT OTHR. Phone als. (Oxford) 0865 872300. Rotator. £75. Pye Westminster 4m FM -I. PSU Post-War to current Magnetrons. Klystrons. fRornsey. Hants) 0794 516007. RAF R1273 HF OF Rx, TGRI 5070/5333. His- eta Beam: £50. Heathkit DS2 CRO: £10. T/R cells, Photo-Multipliers, Microwave and BOOKS CPIM Assembly Language Program- torical, operational and technical Information (Romsey. Hants) 0794 516007. special CV types. Required Static or Rotary ming - Ken Barbier. CP/M Techniques - Ken required to assist with restoration project. YAESU FT101Z0 Mk III, WARC. CW Filler. Inverler, AC or Dc UP with OfP of 80/115v Barbier. Publisher Prentice Hall. G3WPM, RAF PU298, TR9, TR11, R1082. T1083 and FM, fan, Mike, gwo: £425. Trlo 9R59DS valved 150012000 Hertz Also Rs Type R1355 10D/ OTHR. (Solihull) 021 745 2915. ccts/ into lor Eureka (IIC and PU298 also SW Re gwo: £30. Alan, GOKMC, evenings. 13032 unmodified. Please phone any time. CRT BRUAAR SE5/2A31 or Equivalent for sought. WHY? Martin. G4NCE. OTHR. (Bir- (Aylesbury) 0296 658037. (London) 071 511 4786 or 071 790 2846. Solanron CD1400 Scope. Will pay up to: £20 mingham) 021 357 6139. YAESU FT107M 160-10m Inc WARC, solid plus shipping for tube in good condition. Will REDIFON R1106 Safari RF Modules for Band state HF Tcvr. memory unit, power supply, AUTOPLEX All brass Bug Key made by David pay more for NEW CRT. Grateful also for info 'C'. Also 250pF single and hvin Capacitors for speech Processor, Mic, CW litter, vgc: £400. Marshall in Glasgow. c.1932. Any condition, on where new Tube obtainable. G3NID. OTHR. 153W ATU. South Croydon) 081 688 2564 FT29OR 2m !Anode, Mic, case, Nicads, complete or incomplete. G3TSS, OTHR. (Huntingdon) 0480 4E6693 evenings. SOUD STATE Inverter 24/28DC in,115v400Hz charge r, vgc: £200. FT69OR 6m Wmode, mic. (Corbridge) 0434 633125 DC-DC CONVERTER for Trio TS830S. El2E2. 300VA Out. 61311U. OTHR. (Uxbridge) 0895 DC lead, vgc: £200. (Sheffield) 0246 414995. OTHR. (Bray. Wicklow) 01 2863409. 230006. CIRCUIT Marconi Instruments 40khz-50Mhz YAESU F1200 immaculate, boxed, handbook. DENCO COILS All Types, ranges, transistors, TEN-TEC Century 22 In GWO. Yaesu F170. Oscillator TF1246. Also service data and cir- Mike, all crystals: £185 plus carriage, might p/ valves, dual, etc. Used, unused. Yaesu Active any version. Marine VHF Meld. G3RHP. cuits for Sony TC-K7 II Cassette recorder. all ex wanted: recent ARRL Handbook, Pre-1985 Aerial FRA7700. (Leigh) 0942 604674. OTHR (Ipswich) 0473 890007. Equipment Brochures. (Castle Cary) 0963 expenses reimbursed as agreed. GONBO. DESIGN DATA for Mullard Ferroxcube Vlnkor TRIBANDER 3 Element wanted. Must be in 24319. OTHR. (Cheadle Hulme) 061 485 2054. Pol Core type LA2705 Permeability or Induct- good condition, (NrChnstchurch)042572927. YAESU F1290-2 with FL2025 Linear, battery ance factor. E Jackson. Thule, Gidleigh, case, charger: £380. FRG7700 Receiver SWL. KENWOOD TS9305, TS940S, TS850S must TS530S Service Manual, buy/borrow (Bias/ Chagford, Newton Abbot, Devon TO13 811T. ATU: £220. Yupiteru MVT7000 Scanner 0.1- be as new, not over five years old. Can collect ALC info urgent). M50 Desk Mic. YK6E1C filter. DIGITAL Display DG1 Complete for Kenwood 1300Mhz no gaps as New: £250. Yaesu within 75 miles. Philip, GOJ TM. (Huddersfield) FT227R Mobile brackets + Desk support. TS820.GDOPLR, OTHR (Douglas.I0M)0624 FT411E 2m Handle, Mead and charger: £160 3484 843388. Advance TC12/TC12A manual. IC info, mains 624102. As new, Buyer collects. Cash ONLY. Ask for plug, spares. 2mtr Co-linear, modestly priced Graeme. (Kidderminster) 0562 822806. KENWOOD VF0120 and DFC230 must be EXT VFO to suit F1102. Also FL2100Z. Sensi- but reliable, matchable, waterproof! (Pral lo- YAESU FT290R2 with Nicads, charger £300. VGC. Please wnte Peter, G4ADJ, 3 Yew Tree ble Price Paid. GI3HNM. ( Belfast) 0232 cal • non driver) Keith, GOOZK. (Stockport) Trio R600 Rs 0.5-30Mhz: £200. Both mint. Close, Worcester, WR5 2LH or phone before 483460. 061 477 5303. boxed. 'cam IC240 145Mhz Mobile: £100. June 10th. (Worcester) 0905 356583. FILTER CW for FRDX400 Rs. type MF455- VALVE HOLDERS Harnrnarlund Ceramic Octal Transcom C B with Sprectrum conversion 25w 03AZ or Equiv. John, G3UFW. OTHR. and Moulded UX6 1.5inch Fixing. Bernard linear LPF: £40. GOOIW. OTHR. (Reading) VERSATOWER 45-60 ft Wall Mount, Also 50 (Romsey) 0794 22592. Litherland, G4IMT. OTHR. Tel anytime. 0734 483593. Ohm Coax approx 100ft low loss. 2001400W HANDBOOK and/or Circuit Diagram for (Chlppenham) 0225 891254. YAESU FT48OR 2m M/mode Mobile Tcyr 10,v+ VHF Amplifier. 400w or over SWFt/Power Sommerkamp TS788DX. Your price. 014RYP. VFO lor F175 HF Transceiver. Brian. G3VVG. output, twin VFO, good condition: £290 Meter. 14.17 ele 2m Antenna or complete 2m (Armagh) 0861 524267. OTHR. (Plymouth) 0822 852867. one Sola Linear 2m PA SCL 144/100: £90. Bank for EME work. Best pnce please. (Slough) HF LINEAR wanted, Heath SB220 or 1L922 WANTED Murphy Rover (might be called 820) 2m 5/8wave Mobile whip, PI259 base: £10 as Phone eves 0628 605210 or days 0753 type Also Weiz AC38M ATU and 15440.. Dash Mount high or low Band. Working or not. new. G7OLM. (Paignton) 0803 521699. 518082. G3TCO, OTHR. (Bristol) 0272 681068 after GM8KCS. (Edinburgh) 031 445 5182. YAESU F1980 fitted with all options plus addi- 6Prn- tional 2.1Khz SSB filter, workshop manual, WANTED TWO 455Khz IF Transformers ca- IC740 FM board. (Belfast) 0232 483460. microphone. Best &forever : £650. G3FYS. - pable ol 250 volts working (Electroniques or ICOM IC202. IC215, IC402, IC415. Also alined r type and size). G3JKZ. OTHR. (Witney) Vibrotlex Bug Key in good condition. Also NO PHONE NUMBER, Mutek TVVF50a 10m> 8m Transverter. EXCHANGE 04001. (Wembley) 081 902 5995. 10 WAY JONES connector for (CDN)58 Set ICOM M700UK Marine Tx/Rx. Plus A1120 Handbooks for Admiralty Wavemeler 079/ ATU in perfect working order. Phone Paul 70CMS 17 elm Vogl Antenna, exchange for 2 WANTED W3355A A, AM Wavemeter W1117. Phillips (Isle of Wight) 0983 78756. metre Vagi Beam antenna. Cell GOCTE. (Croy- Oscilloscope PM3230 No 10 Crystal Cali- INFORMATION for Nolton Nova 24Z 10 chan don) 081 688 4563. brator. (Glasgow) 041 556 6985 ANY HEATH KIT Amateur Radio equipment, in Mobile, Circuit Diagram, Sennce or Alignment ALINCO DJ580 2m/70cm FM Too + antand ANY PREWAR Wireless Books and Reins. particular SB300 and SB400 and Access°. Information. Costs re-funded. Please NO in- receive, mint cond, rarely used. Exchange for Crystal Sets, Gramophones. Also early Tel- ries. Will consider Eqpt of any condition and formation from G.W.M as I have this already. Compact Camcorder, cash adjust, il neces- ephones. Wanted for my collection. 030`el, am inersted in any stock holdings of spares G1 EYL. OTHR. or Phone (Dronfleld) 0246 sary. G4IFK. (Stourbridge) 0562 883804 Good price paid, will collect or pay postage for OTHR. ( Huddersfield) 0484 662824. 415667 after 5pm. KENWOODTH25E with box, packing, charger, delivery. Please contact un the evening or at ATU 1.8 to 30Mhz MFJ948 or Similar. Brian, INSTRUCTION ManuaVPhotocopy for AVO VOX headset, YLS very little use. Exchange GOKJG. OTHR. West Midlands. Will collect Weekends during the day. (Sheffield) 0742 Douglas Coll Winding machine (Wave wind- for 70cm Mobile or H/held good cond.GOG K Y. 50 miles radius. (Rowley Regis) 021 559 455216. ing motor driven version). G3JSP, OTHR. (Redcar) 0642 478127, 5882 (Nottingham) 0602 604563. RACAL PRM4031 HF Transceiver USFULSB/ VIBROPLEX Lightning Bug. Vibroplex Cham- ATU No6 for WSC12 Hallicrafters S27 Re- KW204X1E KW77, WS18, WS62, Eddystone AM/CW, 1.6-30Mhz with circuit diagrams for pion Bug. CW Enthusiast seeks well loved ceiver, R210 Receiver. Technical Info required good 2m Mimed°. (Chippenham) 0249 example of each, Please dont let your Bug die as follows:- Substantial deposit paid to loan 88M. Eddystone EA12. Anthony, GW4RYK. in a Collectors cabinet, Lot it live on in the for photocopying or purchase WS19 EMERS (Montgomery) 0686 632255. 659328. hands ol a caring user. All replies answered. SCR609/610 Tech Manual, Phillips L6X387 OLD CALL Books Wanted for vintage collec- STANDARD C528 Dual Band 1-4/held with all John, G3JVC, OTHR. Or please phone after Circuit. Needs WS19 6/12 pin sockets, etc. tion. 041 29, OTHR. (Manchester). mods, excellent condition for good 2m Mobile Bern. (Surbiton) 081 398 0939. Please phone Jun. (Kidderminster) 0562 PSU For F1200 TCVR. (PT200? )Bill, 03P01, in sarnecondition, GOOPD,OTHR. (Fareham) 823674. OTHR. (Plaistow. London) 081 470 1795. 0329 844032.

TerFar 081-902 5218 Second User HOTLINE I HATELY ANTENNA SURE D ATA TECHN O L O G Y G M3H AT 0831 616519 taller hours) AMSTRAD REPAIRS ANO SECOND USER SALES 1 Kentleld Piece, ABERDEEN AB1 7UW, Scotland, U.K. ICUS WU. alastraws Nat fad whin daliteispasudwrttey 01.30 1°21.30 se 0224 316004 SECOND USER EOUIPMENT. This month apart from PC systems for solo starting at NEW MODEL CAPACITOR DIPOLE for 20,16 and 10 Metres CD 14,21/28 £125. I am after your broken POW, PC or monitor so if you want to dispose of them give mu a call and I'll make you an offer. More efficient cable material' poly-propylene Complete re-design of our earlier but withdrawn UPGRADES: Our very popular 3.5" disk drive upgrade kits for PCW 8258/8512/9512 model for the popular DX Contest Bands. Fully balanced, tow 5». fed by SO ohm coax. Acetate and P C I 51 2/1640 are still available. A phone call will get you advice and a price. 400W RF power. CD 14/21i28 priced £55 Inc VAT post paid UK or wond wee. REPAIRS: Phone for a diagnosis and estimate 73'5 John G3TLU Technical details send TWO first class stamps All other models stilt available Proprietor Maurice C Haley, M.Sc. FIEE. Chartered Electrical Enema« Licenced since 1950 UNIT S. STANLEY HOUSE, STANLEY AVENUE WE N Lt V, Sisal MAO MI

NOTICE TO OUR READERS EX-WD PLUGS & SURPLUS BARGAINS! Although the staff of Radio Communication take reasonable precautions to protect the interests of readers by ensuring as far as practicable that tidvertisements in our pages are bona fide, the magazine and its publisher, The Thousands of Plugs & Sockets for all types of Radio Radio Society of Great Britain, cannot accept any undertaking in respect of Equipment used in Aircraft & Ground Stations, incl claims made by advertisers, whether these advertisements are printed as part of the magazine, or are in the form of inserts. l'he publishers make no P.O. Plugs & Sockets, Original Morse Keys. Ref No. representation, express or implied, that equipment advertised conforms with any 10A/7741 used with T1154 and R1155 Gee Sets. legal requirements, and in particular the requirements of the Electro Magnetic Compatibility Regulations 1992. Braided covered cable 2-24 strands, Earphones, Readers should note that prices advertised may not be accurate due to currency Microphones etc., Over 750,000 different Ref No's exchange rate fluctuations. and appx 2000 tons of equipment in stock. Why not While the publishers will give whatever assistance they can to readers having complaints, under no circumstances will the magazine accept liability for non- visit one of our four warehouses and see for yourself receipt of goods ordered, or for late delivery, or for faults in manufacture. Legal our vast stockholding! Phone or fax for appointment. remedies arc available in respect of some oi these circunistamxs, and readers who have complaints should address them to the advertiser or should consult a METHODICAL ENGINEERS LTD local Trading Standards Office, or a Citizens' Advice Bureau, or their own solicitor. Manor Trading Estate, 4/6 Armstrong Road, Benfleet, Readers are also reminded that the use of radio transmission and reception Essex SS7 4 PW. England. equipment (including scanning) is subject to liceneing und the erection of external aerials may be subject to lordl authority planning regulations. Tel. (0268) 792681 Fax. (0268) 795375 Telex 99214

RADIO COMMUNICATION June 1993 dl EVENTS DIARY

PLYMOUTH RC • 1. Discussion Night; IS. Table DACORUM AR&TS • is, lark 'Radar Counter VHF " NEW SECRETARY •" Julie Brown, CLUB NE WS Top Sale: 29. Club visit go be confirmed). Details measures in WW2' by John. G3WFM. Details GOSOU. All correspondence to:- PO Box 4. D C Perryman. G7NMA, 50 Bellingham Cres- 0442 259620. Nottingham tell 9DE. Details 0602 211069. DEADLINE - Items for inclusion in the cent, Plyrnpton, Devon PL7 30P. HODDESDON RC - 24, Operating frorn Tamers NORTH YORKSHIRE August 1993 issue must be sent to HO TORBAY ARS 18. talk 5134 Christmas by Andy, Scout Camp. Details 081 804 5643 marked "Club News - DIARY", to be G4UPM. Details G4VTO, OTHR. STEVENAGE & OARS - " NEW CLUB VENUE SCARBOROUGH ARS • 1st Monday, Surplus equipment sale. Details John, GOPII, OTHR received by 18 June latest. If news is " Stevenage Day Centre, Chotts Way, DORSET 0751 73991 received by the published deadline, it Stevenage. I. Morse tor Novice and •B's (and DORSET POLICE ARS - 3, Visit to Bourne- 'A's); 8. Plans for Museum Exhibition and 10Km POWYS should appear in the listing. It is your mouth International Airport Tower & Radar; July run, 15, Pac-Com Demo and Talk by lorry. POWYS ARC - 3, NFD Briefing; 10, Talk by Jell responsibility to ensure that Items are 1. Visit by Hampshire Police Amateur Radio GOOVO; 19. Exhibition of AR al Stevenage Worrell Irons Coln Povrys Electronics Dept; 24, sent DIRECT to HO in good time. News Society. Details 0202 229351. Museum: 20, Letchworth 10km Fun Run - Mar. Talk on DFIng by Glyn. GWOJAI; July 1, Fox items should be sent in writing, prefer- shalling the route: 22, Practical 1-IFNFIF on air, EAST SUSSEX 29, Talk 'Antenna Design and Construction' by Hunt. Details GW3JSW, OTHR ably typed or written legibly, and be signed SOUTHDO WN ARS • 7. talk 'Antennas - Slim GORAM. Details 0438 350862. SHROPSHIRE by the club secretary or the person re- Jim to HF Beams': July 5. BBO Details 0323 WELWYN-HATFIELD ARC • 7. Talk 'OHMS' by SALOP ARS - 3. 2nd Fox Hunt, starling al The sponsible for publicity. 412699 John, G7JKN; 21, Preparation for VHF NFD. Oak carpark al 7.30pm: 10, RAYNET recruiting: July 5, Foxhunt Details 0920 462241 ESSEX 17, Talk 'Crime Pievention• by Sgt Bob Lloyd. NOTE: This is primarily a service for VERULAM ARC • 22. Talk 'Frequency BRAINTREE S OARS • •" NEW SECRETARY Details 0939 290609. clubs affiliated to the RSGB, to whom Synthesisers - how they work & limitations' by Mr J F Button, GI WOO cio G4JXG (OTHR), TELFORD & OARS • 9, Black flag neghl: 16. Dave. GOSNO. Details 0923 262180. priority will be given. 88 Coldnailhurs1 Avenue, Braintree. Essex CM7 DFing Introduction; 23. VHF NFD Preparation; SPY Details 0376 327431 HUMBERSIDE 30, Aerial erection competition at Coslord. De- rails 0952 588878. AVON CLACTON RC - "'NEW SECRETARY "• Mr M GOOLE R & ES - Il. Logfill Session; 18, VHF Jackson. GOSMJ, 44 Dulwich Road, Holland on RSGB CITY OF BRISTOL GROUP - 21. Bristol NFD Planning; 25, Conload Details 0405 769130 SO MERSET DXpectition Aldeiney; 27, Longleat Rally. Details Sea. Essex C015 5NA. Delano 0255 815207 GRIMSBY ARS • 5.6, NFD Cities Geary sits WEST SOMERSET ARC - 1. Fox Hunt, July 6, 0272 672124. VANGE ARS - 3, Junk Sale: 10, Talk 'First Aid' Details Grtrnsby 825899. visitinug. DINAspeakerito be announced). Details SOUTH BRISTOL ARC - 2, Astronomical by Tony, GOBTS; 17, Talk «ORP' by 03101, G4m Evening: 9. 80m activity evening. Bulls Eye al G4VZF and G4XTS: 24. Discussion evening KENT YEOVIL ARC - 3. Necessary Leona) Testa at North Bristol AR Club; 16, talk 'Agate Speed ol Details 0268 552606. DARENTH VALLEY RS - 9. Construction C011. your Station. G3MYM; 10. BOO on Ham Hill • Light': 23. Preparation for Longleat rally, 27. test. Details 0474 703322 ORP Contest portable, 17. Visit to BBC Longleat Rally: 30. Honte Brew-1 sl evening- FIFE EAST KENT AS-17, Annual Car Treasure Hunt Transmiler at Rampisham. Details 0258 73845. Terry's Trophy Details 0275 832222 Wednes- DUNFERMLINE RS • 3. VHF Operating Evening Details 0227 364606. day eve only. and DX Hunt preperation; 10. HF Evening with HILDERSTONE RS Starting late September, SOUTH GLAMORGAN Class El Supervised Operating. 17, VHF DX Hunt - Canterbury area, RAE course run by G3JIX for BEDFORDSHIRE evening. 24, HF Operating Evening and Work CARDIFF RSGBG - 14, Static Electricity Friend Examination in 1994. Details 0843 869812. or Foe, OW4H WR, July 10. Demo of AR3000B DUNSTABLE DOWNS RC • 4. Intorme meeting: Party. July 1. Talk 'Early days in Radio' by Tom SEVENOAKS & OARS • 21, talk 'Kil Cars' by Scanning Receiver. GW3RWX. Details 0446 11, Junk sale. Details 0525 211249. Hughes Details 031 331 4340 Alistair Dunlop, G7IET Details Sevenoaks & 773212. SHEFFORD & OARS - 3, Pedestrian OF hunt. GRAMPIAN OARS, Council Offices, Argyle Road. Sevens:airs. 17. NFD planning: July 8. WO. Details 0462 SOUTH YORKSHIRE MORAY FIRTH ARS • Club meets every Thurs- Kent TN13 1HG 700618. MALTBY & OARS - 18, talk Switch Mode Power day at 7.30pm. Details 0343 86395. SOUTH EAST KENT (YMCA) ARC - NEW BERKSHIRE SECRETARY '" Michael Bowers, G7NOR, 3 supplies' by George, G&R IL ** NEW " Club now Pnoress Walk, Dover. Kent CT18 2DS. Details meet on Fnctays at 7.30pm. Prospect House. BURNHAM BEECHES RC - 7, Quiz; 21. talk GREATER LONDON tel: 0304 825030, eve or weekends only. Muglel Lane. Maltby, Fin Rotherham. Details 'Safety Testing'. G4XIDU; July 5. Getting ready ACTON. BRENTFORD & CHISWICK RC - 15. Keith, Gr POW, OTHR 0709 7980984daytime) or lor McMichear93 Rally. Deans 0628 25720. Pre Low Power Field Day. Details 081 749 9972. WEST KENT AR S • 4, Informal meeting: 18, talk 011 Aerials. Details G3OHV, OTHR 0709 814135. MAIDENHEAD & DARC - 15, talk 'Sparks in the COULSDON ATS • 14. Talk 'Secret Listeners' by Ether(1925 and all the' by 03TWG: July 1, Fox Brien. G8DIU. Details 081 684 0610. LANCASHIRE STAFFORDSHIRE Hunt. Details 0628 25952 CRAY VALLEY RS • 3. Talk 'Reservers (pari II)' CANNOCK CHASE AF1S - 3, talk 'Cnme and BURY RS - Club still meets al Mosses Commu- NEWBURY & OARS - 20. Annual Radio Boot by G6WRP: 17, Annual OF Hunt: July 1. The punishment' a survey by Mr A J Mitchell, JP nity Centre, Cecil Street. Tuesday evenings Sale; 23, Talk 'Palmer' by G Kearns, Details 'Camel' Trophy 1992 and 93. Details 081 850 Details 0204 883212. G4ICE and G7APS. Deans 0543 262495. 0835 863310 1388. HESKETH ARC • 8, Honey in the ether. 22. STOKE ON TRENT ARS • "• NEW SECRE• READING & DARC • to, VHF NFD Planning CRYSTAL PALACE & DRC NEW SECRE- Microwaves:July(1, Battle of the Atlantic. Details TARY Albert. G4DHO Club meets every Details 0734 476873. TARY *** Mr W E Taylor, G3DSC, 39 Woolstone Thursday 7.30pm at The While Swan, Honeywall, 0704 63344. Road, London SE23 2TR. Details 081 699 5732. Penkhull. Stoke on Tren Each meeting has CW THORNTON CLEVELEYS ARS • 7, Talk 'Stack- BUCKINGHAMSHIRE EDG WARE & OARS • 10. Talk 'Expenences in practice, help with the RAE and activity on the ing Antennas' by Dave. G8KBH; 14. Planning for CHESHAM & OARS • 2. HF NFD planning: 9. Sn Lanka' by Doug. GO WN; 24, Morse Training alr. All welcome. Details 0782 638801_ VHF NFD; 21, Talk by Mick. G4E2M; 28, Final Wet String ORO Contest; 16, Resus COWS° vnth evening Details 081 204 1868. prep for VHF NFD. Details Irons G4BFH. OTHR. SI John Ambulance; 23, Tech Topic 100Hz KINGSTON & OARS - 17. Talk 'Radio with STRATHCLYDE ROCHDALE & OARS • 7, talk 'HF Airbartizr by Operation with G8KOW; 30, VHF NFD Final Computers' by Jim, G4XLM and Peter, G3XTC KILMARNOCK & LOUDOUN ARC - 1, Field Day GOPUD Details 0706 32502 or 061 653 8316. planning: JULY 7, NFD Review and discussion Details 081 398 1128 preparations: 15. talk 'Computers in the Shack' Details 0494 876391, SURREY RCC • 7, Talk 'History 01 the Onginal LEICESTERSHIRE by GMOONX: 29. Talk 'Licensed Station - Test Requirement' byGM3YEH. Details 0563820052. CAMBRIDGESHIRE London Aerodrome - Croydon': July 5. Talk CHARNWOOD ARCC • 6, Contest planning 'Amateur Remote Imaging' by John Tellick. De' CAMBRIDGE & DAFIC - 4. Visit to the Medical VHF: 20, VHF Contest Details 0509 232927 SUFFOLK tails 081 660 7517 Physics Dept al Addenbrookes Hospital; 11. talk LEICESTER F1S • 7. HFNHF Activity night: 14, FELIXSTOWE & OARS • 7, Night on Air al OPS. SUTTON &CHEAM RS - 17, Talk 'Computers en 'VHF Propagation' by John. 041380. 18, Morse HF NFD Post modem. Committee meeting. 21. 19, Demonstration stanon at Walton Hobby Fair. Amateur Radio' by JIM. G4 XLM & Peter, G3XTC: training: 25. DF event Details 0763 243570. HFNHF night on air; 28, VHF NFD anal arrange- 21. Talk 'Amateur Satellites' by Pal, G3IOR July 8, Informal, Details 081 644 9945. ments. Details Leicester 762241 Detail 0394 273507. CHESHIRE THAMES VALLEY ARTS - 1, Talk 'Radio Con- LOUGHBOROUGH & DARC - 1. 160 Metre DF. IPSWICH RC - 9. talk 'How to layout printed trotted Aenai Photography' by Jetai Crampton CHESTER & DARS - 1, Radio ideas & discus- 8prn start Hind Lays. College. Shopshed; 8. circuits lhat work' by GOOZS; 30, DF Hunt Details 0483 284279 sion: 8. talk 'Valves and things!' by Phil, G3SES. Wymeswoldlink•up with Stow Scan to Shepshed. Details 0473 742072. 15, talk 'Japanese Morse' by Norman. G3CSG: WIMBLEDON &DABS- 11. Talk 'Dip Osallators IS, Open Forum: 22, Annual Reunion, please 22. talk 'Microwaves' by Mike. G3PFR; 29. Op- and their Uso' by George, G3D WW, 25. Talk note new venue: The Bulls Head, Warren Hills SURREY erations night Club field. Bnng your own gear. 'Intruder Watch' by John Cleeve, G3JVC De-. Road. Coatville. Debuts Loughborough 218259. ECHELFORD ARS - 10, Primary Cells Revisited Details 0244 336639. tails 081 397 0427 by Ed Caviler; 24, Vintage Radio by Mike Pol- M1D•CHESHIRE ARS • 2, Junk Saki; 16. Own- LINCOLNSHIRE lard, GeewA, July 8. Oscilloscopes by Paler lions and Answers; 23. Video night; 30. Contest GREATER MANCHESTER GRANTHAM RC - I, Inter Club Ouiz Details Hale, 021-1S Details 0344 843472. Planning. Details 0606 331210. ECCLES & OARS • 1. Discussion '432kthz Low 0476 65743. THREE COUNTIES ARC - 9. Live demonstra- STOCKPORT RS • 9. tan< 'DXpedsti011S. by HS0/ Power Contest': July 6. Lecture 'Retinitis LOUTH & OARS • meet on 3rd Tuesday in month tion of sweep generators techniques including G3NOM. Details 061 439 4952 Piernentose' by GEIPMX. Details 061 773 7899. at The Wee nier', Louth, Details GIXWO. OTHF1. an antennae by Gragam. 04WNT; 13. RNARS rally at Collingwood; 19. A lamely visa to the HAMPSHIRE SPALDING & OARS • 6. Judie° Mobile Rally at CLWYD Springlields Gardens, II, Talk 'Wire Aerials & Bluebell Railway; 23. talk 'Telecommunications CON WAY VALLEY ARC • 3. AGM; July 1, Con- BASINGSTOKE ARC • 7. Construction Compe- Matching Units' by 0400. Details 0775 750382. of the future Details 0428 642930 struction Display Evening. Details 0492530725. tition & VHF NFD Planning; 27, 2m OF Compe- WREXHAM ARS - 1, Junk Sale: 15, Field tition • oslas • Fox: Dave, G4WIZ; July 5, MERSEYSIDE WARWICKSHIRE Perfornance Racing Cars with vehicle. Details Evening, July 6, Mal. Details 0978 845858 LIVERPOOL & OARS 1.NFD Propamtions part MID-WAR WICKSHIRE ARS - 8, Metalwork 0256 25517. 2; 8, G3AHD on the Air 15, Construction Tech- mechanical construction: 22. Fox Hunt, 7pm DERBYSHIRE HORNDEAN & ()ARC • 3. A talk on Astronomy niques by GOIFK; 22, HMS Plymoulh(G3SGOI; start. Details 0926 424465, BOLSOVER ARS • 9. 3rd DF hunt 23, 4th OF by Mr A Dowdell Details 0705 472846. 29. Surplus Sato Details 051 722 1178 STRATFORD UPON AVON á OARS - 14, Mo- hunt. Detail 0246 822856. ITCHEN VALLEY ARC • 11, Visit & Talk tram bile Operation, Derek, G4ABS; 28, Technical BUXTON RA • 8, Oinz night. 22. Talk by Castle RSGB President, Peter C hadwick. G 3RIP: Other NORFOLK Topics evening Details 060 882 495 Electronics. Details 0298 25506 Clubs welcome: 25, Hampshire Ambulance Serv- NORFOLK ARC - 2, Talk 'International Rescue WEST GLAMORGAN DERBY & OARS - 2, Junk Sale. 9, Illus talk 'The ices: Opento VIS110(S. " NEW SECRETARY " • Corps' by Pater Wooster. 9, NARC Rally bent' Carsinglon Reservoir Project' by John Jepson ol Les Kennard, G3ABA, OTHR Details 0703. ing; 16, talk 'History of sound recording' by Tony, PORT TALBOT ARC - 1, Planning meeting for Severn-Trent; 18. Talk by Castle Electronics: 23. 732997 G3NHU, 23, Debate: Scanners • Has their mis• SSB Field Day. NEW SECRETARY - Ted Radio in the SI John A MbUlab00 SOM CO by Alan SOUTHAMPTON ARC • Club now roactivatod use affected the Amateur Image?: 30, OSLs, James. (MONK F, 1 Pam, Road, Margaret, Pont Jones; 30, Video; July 7. Junk Sale. • "NEW Meets 1st Monday ot the month at Millbrook bring your most Interstine OSL cards. Details Talbot, West Clam SA13 2LF Details 0639 SECRETARY " Mrs Haley Winfield, (2E1AJI) Community School, Green Lane. Maybush, 0603 618810. 892311 2. 1-11115 Cottages, Crich, Matlock. Derbyshire, Southampton. Also on the 3rd Monday at the DE4 500. Tel: 0773 856904 home el a member. Details G1U WL. OTHR or NORTHAMPTONSHIRE WEST MIDLANDS SARC. PO Box 249, Southampton 509 7SU. NORTHAMPTON RC - 24, Mobile DF Club BROMSGROVE & DARC -July 3, Bromsgrove DEVON SUBMARINE ARC - Meets on Thursday eve- moots every Thursday. 8pm al 2 Hervey Street, Carnival, GBOBC, 9. Talk 'Shortwave Listening' APPLEDORE & DARC • 21. TalkNidervDemon• nings at HMS Dolphin. Gosport Hants, Details Northampton. Details 0604 401098. by Arthur Muter. Details 0562 710010/710025. stration on Satellite TV by Graham, G 1 ZTJ. 0329 283646. SOUTH BIRMINGHAM RS • 2, My Amateur Details 0237 477301 WINCHESTER ARC • 18, Talk 'Ham Rado, an NOTTINGHAMSHIRE radio experinces by Dennis. G3YKO: Jury 7. EXETER ARS 14, Talk by Richard, G2DYM old man dying on tris feet?' by Steve. G4JGS. ARC OF NOTTINGHAM • 3, Forum; 10. BBO, Demo by Ward Electronics. Details 021 458 Details 0392 214204. Detaits 0962 860807 17, Foxhunt No 3 / acavity; 24. Construction, 1603 EXMOUTH ARC - Change 01 Meeting Place. activity. Details 0602 232604. WEST YORKSHIRE Club now meets at the YMCA in Victoria Street. HEREFORD AND WORCESTER MANSFIELD ARS - '" Change of day for meet- Exmouth at 7.30pm on alternate Wednesdays. BROMSGROVE ARS - 8, Aerial Construction. ings " tri future, meeting will be held on the DENBY DALE ARS - 2. Fox Hunt. 7 30pin start. 9, Talk by Crime prevention Officer: 23. Treasure 22. Night on the Air(HF). Details 0527 546075 second Monday in the Month. 14, talk & demon- IS. Pre-Rally Meeting; July 7, Homobrow Test hunt. Details 0395 279574 stration on Packet Update by Denis. GOKIU Equipment. John Townend.G388D. Details 0484 SOUTH DEVON RC - 2, Contest Talk; 13.50Mhz HERTFORDSHIRE Details 0623 755288. 429238. Trophy, 19.432 FM; 23. Project night. 30, NFD CHESHUNT & DARC - 9. DF Hunt, Baas Hill SOUTH NOTTS ARC - 11. Talk 'Construction of HALIFAX & OARS • 15, Modlying PMR equip- Planning meeting. Address for details and direct Common, Broxbou me; 23, oxirig In SilLanka by High Current Power Supplies'; 13. Club stand at ment by Philip Morley. G4FS0 Details 0422 OSL cards: SDRC, PO Box 4, Brixham, Devon Doug Goodson, GOLUH; July 7, Junk Sale, Elvaslon Castle rally; 18, Construction al Fairharn 202306 TOS 801-1, Details 0803 522995. Details 0992 464795. Calage. 20, Second Fox Hunt: 25, On Air-HF KEIGHLEY ARS • 3. Natter night: 10. Radio

88 RADIO COMMUNICATION June 1993 EVENTS DIARY SILENT KEYS

Controlled Modes. 17. Natter night. 24, Fox and Members. Talk-in on 2rn Further into and able. Talk•in on $22 or via 0930V on Hunt Details 0274 496222. booking lornts from T Nightingale. G6CIV, 0507 433.125Mhz Details David. G7DIU on 0480 t E HAVE BEEN TODMORDEN & OARS • 7, Fault Finding by 522482. 432333. SUSSEX AR&C FAIR at Brighton Racecourse. ' advised of the Tony, G8LTC. Details 0422 882038 5 SEPTEMBER Start 10.30am. Trade stands. bn ng and buy stall. WILTSHIRE Picnic area, refreshments, car parking. Free BRISTOL Radio Rally (incorporating Bristol deaths of the TROVVBRIDGE & DARC - 2, 144 Fox Hunt. shuttle to Brighton sea !font Details let 0273 Computer & Electronics Payne) Details Iron, 7.30pm start Southwick VH; 16. Planning or July 501100. Munol Baker. G4YZR. 62 Court Farm Road, following radio SES. Details 0225 864698 (evenings) Whitchurch. Bristol BS 1 4 00G, tel: 0275834282 12 JULY MILTON KEYNES & OARS - 71h Annual Radio amateurs: SUSSEX AR and Computer Fair - 10.30am to Boot Sale. Details Ray. G I LRU, 0908 660798 4pm Trade stands, bang and buy stall, picnic TELFORD AR Rally • Unual venue, Telford Rac. RALLIES AND area refreshments, car parking Childrons en- quel & Exhibition Centre, Telford. Contact Bob. 2E1AMFI Mr J R Dixon tertainment and a free shuttle service to Brighton 07ewo 0952 770922 8P6BC Mr H A Reece EVENTS sea Iront Details from 0273 501100 VANGE ARS • Annual Rally. Details Mike GOAML Mr C D Stewart 26.02.93 This is a list of all rallies, hamfests, 18 JULY Musgrave, G4NVT. 0268 543025. GOMNF Mr W E Licence Oct 92 exhibitions and conventions notified to RSGB WOBURN Rally. Details from N0fMall 11 SEPTEMBER GONOJ Mrs J Slater 06.02.93 HO (as at press date). Items are given In Miller. G3MVV, 0277 225563 (See panel on SCOTTISH AR Convention (SARC93)•Cardonal G1RRZ Mr A G Gibbons 09.03.93 page 40). detail for the next three months inclusive College. Glasgow. Details Torn Hughes. G3BYO Mr W G Dunlop 26.02.93 GM3EDZ. 041 882 5753. and in brief thereafter. Please send de- 25 JULY G3FYW Sqn Ldr D H Lester 24.02.93 tailed Information, Including contact COLCHESTER Radio & Computer Rally New 12 SEPTEMBER G3JRF Mr R G Fox 23.02.93 Venue • St Helena School, Sheeper Road. Col- callsign and telephone numbers direct to BARIO Rally - Sandown Exhibition Centre. G3KYU Mr J Ashford 24.02.93 HQ and marked 'Rally News - DIARY'. chester. adjacent to Colchester inner bypass. Details Peter Nicol. 38 Mitten Avenue. Rubery. Avanue ol Remembrance. Door opens 10 • 4pm Rednal, Birmingham 345 Oa 021 453 2676. G3MYX Mr F C Richardson 08.03.93 Admission £1. Wide range of fade end compu• 4 JUNE LINCOLN SWC • Manliest. Details from Donis. G3NCE Mr R A Wilson 04.02.93 tor traders and component suppliers. A cqr boot 01X20, 0522 684214 BANGOR & OARS • Open Night and Exhibitition sale, bring and buy. Refreshments and licensed G3RFC Mr L Ogden 27.02.93 Station in the Bangor Technical College at 8pm. bar. RSGB Morse tests on demand, bring your 18 SEPTEMBER G3TJO Mr D J Bean 16.02.93 Events RSGB Video: Talk on Novice Licence; passport size photographs. Ample parking, easy Demonstration of Club Station; Display of AR ISLE OF WIGHT - Annual Wight Rally. Details G3WFV Mr L Thewlis 12.02.93 access for wheelchairs Signposted Iran Al2. G3KPO, 0983 567665 books and literature. OSL cards: Talk on Flaynet. Talk.in on S22 Details horn Frank. G3FIJ on G3WVC Mr E Comford Details from Des, GI3HCP on 0247 460251 0206 851189 19 SEPTEMBER G4CYN Mr R S Bell 09.03.93 6 JUNE RAIBC Ramsey Picnic at Broadlanda. All mem- PETERBOROUGH R&ES • East of England G5MN Mr C R S Moon 16.02.93 25th SPALDING Mobile Ratty - Springfield Gar. bers. 10m4i05. Inends and supporters welcome. Rally. Details Iron, Mike, GOCVZ 0733 222588 Grand draw, junk sale and refreshments. Talk•in G5VVA Mr A Barber 21.02.93 dons. Spalding All under cover in the new Sidi.. on $22. Details John. G4COM 0703 693017 26 SEPTEMBER G7EPI Mr J Gardiner 04.02.93 bition Halls. Details: Mr T Kottlewell, G4TWR, ons 722940, NORFOLK ARC A Hewett School Radio and HARLOW& OARS -35th AnnualAmateur Radio G7FGX Mr D T Foster Electronics Group Rally Doors open al 10am nallY end ComeUter Show. Usual venue Details G8BU Mr L Rooms 17.03.93 13 JUNE Trade stands. bang & buy, displays Free park. from Mike, G7BNF 0850 487863. G8DPB Mr T Hook 27.01.93 24th ELVASTON CASTLE National Radio Rally lag, all the family welcome. Admission £1 Adults. THE THREE COUNTIES Rally • The Three • Elvaston Castle Country Park, nr Derby 150. OAP. disabled and children 50p. Details Shorla, Counties Show Ground. Malvern. Worcester- GI4MBO Mr A Vize 24.02.93 trade stands, technical bookstall, bang and buy GOKWP, 0603 618810. shire. NEW EVENT All trade enquiries oral GM3KZH Mr A Halcrow 01.02.93 marquee. Flea market !fern gars. Craft marquee SCARBOROUGH Radio Electronics & Compu- bookings to Eddy Cotton, 04 POT. 0905773181. GM4PSV Mr R H Ferguson 16.02.93 RSGB stand. Band performances, children en- ter Rally North Riding College, Filey Road. 9th NORTH WAKEFIELD RC Rally. De l ails hom tertainments, catering Talk-in on 2m and 70cm Scarborough. Doors open 1 lam. Many traders. John, G4RCG, 0924 362144 or John. GOEVT. GM4XVX Mr D Myers 30.12.92 Car parking £2, coaches £10. Details from John bring and buy. Morse tests a 'eau lab() on demand. 0924 825443. GWOGHCMr K Rawnsley Robson, G4PZY, tel & lax: 0332 767994; trade refreshments snacks and bar. Details t rem Ross. GWOLAL Mrs P Penlington April 93 enquiries: Peter Neal. G3WFU. tot & fax 0332 G4ZNZ 0723 514767 3 OCTOBER 700265 (eves) GWOPZL Mr A P Jones 26.01.93 29 JULY/2 AUGUST GREAT LUMLEY Radio Rally. Details Barry. 33rd RNARS Annual Mobile Rally • new venue GIJDP, 091 388 5936. GW3LJP Mr W A Mills 28.02.93 AMSAT-UK Colloquium • The Annual Colloquium Sports Field. HMS Collegwood, Fareham. Faints BLACKWOOD á OARS Rally • Details from for all users of Amateur Radio Satellites will Doors open 10.00am to 5.00pm. Details: Cliff Norman. GWOMAW, 0495 227550. again be held at the University oh Surrey. Guild' G4UJR, 0703 557469. WINCANTON RALLY • details Norman. G4YXX tord between 29 July and 2 August. All welcome. 0749 850432. 20 JUNE Details Iront G3Aill 081 989 6741 4Ih ANNUAL BELFAST Radio Rally • "CHANGE 1 AUGUST 8/10 OCTOBER OF DAY AND VENUE ". Held at Chimney RSGB International HF Convention • NEW DATE: McMICHAEL Rally and Car Boot Sale - Haymill John Pilags, G8HHI (GORAW) Comer Hotel. 630 Antrim Road. Glengormley The Beaumont Conference Centre, Old Wind- Youth and Community Cadre. Burnham Lane. Convenient to the Glengormley turning oft the sor, Bents Details G4BWP. 0638 552080 (sec Slough. (near Burnham railway station) Start JOHN PILAGS passed away on 30 March M2 Doors open 12 noon, Disabled admitted at page XX). 11.30am. Trade stands, bring & buy, lucky dip 10.30am, admission £1.50. Car boot salo (no 1993 after being involved in a tragic road and meals available. Talk-in on 522. Details adv. bboking) Is £6 per pitch on the day Talk.in 9/10 OCTOBER on S22. Details Neil, GOSVN or Roy. G4XYN. accident whilst on one of his loves, bicy- 0232 471370 or FAX 0232 471980. THE ALL IRELAND INTERNATIONAL RADIO 0628 25952. (This rally was originally scheduled cle riding. DERBY DALE & OARS Annual Mobile Rally - and HOBBIES EXHIBITION • Armagh & liar 18 July). Shelley High School (6 miles SE of Huddersfield Dungannon DARC and Dundalk ARS. Fairway Amateur radio was his other main on 56116). Doors open 1 I am (10.30am for 8 AUGUST Hotel & Leisure centre. Dublin Road, Dundalk, hobby and John was not only proficient disabled visitors). traders, car bool sale, refresh- Co Louth. Detads Raymond. GIEIRLE, 0762 DERBY & DARS Mobile Rally - Latteover Com- melts and ample parking. Talk-in S22 and SU22. 870423 or Peter. El8CZEL 010 353 42 32641. at it, but excelled with his main interest munity School. Pastures Hill, Littleover. School Details from Phil, G4FS0 0484 644827 on A5250 lust off its Lannon with A38 on south on the UHF and microwave bands. He NEWBURY & OARS Annual Car Boot Sale- 10 OCTOBER side of Derby. Usual attractions including mon. was one of the early holders of the Four Ackland Hall. Cold Ash. Details: N Jaques. 0635 KIDDERMINSTER & DAR S • NEW DATE, NEW stor iunk sale. Details from Marlin. G3SZJ on VENUE: Stourpon on Severn High School. De- Metre and Down Supreme Awards, and 863310. 0332 556875 or via packet @ GB7LTN. taris Malcom, G8JTL 0384 894019 or Jeff, was an active member and Vice Chair- 26 JUNE FLIGHT REFUELLING ARS Hamfes£93. The GOFIJP 0299 822206 man of the VHF Contest Committee for WREXHAM ARS 1st Mobile Rally - Clwyd Vet- Flight Reluelling Sports Ground, Morley, Wirnbome, Dorset. 10 - 5pm. Usual mix of trad. SOUTH DEVON RC Computercations 93. Ama- eran and Vintage Machinery Society's 17th An- teur Radio & Computer Rally - Details Bill, GUAM many years. ers. bring and buy. craft exhibitions, car boot sale nual Steam and Vintage Machinery Show al and held events. Overnight camping taconites on 0803 522216. John was also an active member of Plassey. Eyton, Nr Wrexham Talk-in on $22 by available for Saturday 71h. Talk-in on S22. De- GB1WXM. Details 0978 845858. 16/17 OCTOBER the 'Hillbillies' and 'Parallel Lines' Con- tails Richard Hogan, G4VCO 0202 691021. 361h JAMBOREE ON THE AIR Details from test Groups and has been part of the 27 JUNE 15 AUGUST Activities Office, The Scout Association, Gilwelt winning team in many trophy contests 36th LONGLEAT AR Rally - Longleal House, Park. Chingford. London E4 70W, 081 524 SOUTHEND á DRS Rally and Radio Car Boot near Warminster, Wiltshire. Details from Shaun. 5246. and VHF National Field Day. Sale • Rocheway Centre, Flochford, Nr South- GOVPG. OTHR 0225 873 098. He will be sadly missed by all who end on Sea, Essex. Stan 10am, bring and buy. 17 OCTOBER ample parking onty £5 per pitch Details GOOF E, 4 JULY HORNSEA (East Yorkshire) RC Rally. Details knew him and, particularly, by myself 0702 202216. KINGS LYNN ARC Rally • Cattle Market. Kings Duncan, G3T1I, The Old School. Mappleton. Nr who has not only lost a close amateur Lynn. Details 0553 841189. 22 AUGUST Hornet. 0964 532588. colleague, but a very close friend. NEWPORT ARS 1993 Junk and Boot Sale. WEST MANCHESTER RC Summer Rally De• BrynglasCEC.Brynglas Road. Newport. Gwent 17/18 OCTOBER G4HINA tails: G1t00. 0204 24104 (evenings). Open 10.30am lo Iprn. IDem for disabled. Talk- SCOTTISH TOURIST BOARD PG • Launch of in on S22 by GC I NRS. Details Iront GIN7I3SC. 28/29 AUGUST 1993 Airdrie MOD - GB2STB. OTHR or Tel 0633 262488 NORTHERN LIGHTHOUSE Weekend. Radio YORK Radio Rally. Tattersall Building , York Amateurs in Scotland and the Isle of Man wilt 29/30 OCTOBER(FRI/SAT) Racecourse. Doors open I lam, 10.30am for activate 11 stations at lighthouses through Scot- LEICESTER Amateur Radio Show - Granby disabled visitors. All the usual favourites. bnng & land and the Isle of Man. Details from Mike Halls. Details G4PDZ 0533 871088 buy. Morse tests, amateur radio, electronics & Dalrymple on 0292 443127 computers. Arts and crafts. Ample car parking 31 OCTOBER Details Iront Andy Suter, GOGXI 0904 708164 29 AUGUST BISHOP AUCKLAND Radio Amateur Clubs WE REGRET that GALASHIELS & OARS Open Day - Doors open Rally Details Mike, GOPRO. 0388 768264. 10 JULY 110m till 4.30pm The usual traders, bring and. CORNISH RALLY • Pena« School. Truro. Doors buy, club stalls, raffle, and refreshments. Details 6/7 NOVEMBER owing to lack of open 10.30am, 10am for disabled visitors. Usual John. GMOAMB 0835 22686. 7th NORTH WALES Radio & Electronics Show tradorsamplo parking. refreshments. Details TORBAY ARS Mobile Rally. Venue. Northern Details B Mee. GW7EXH. 0745 591704. from Barrio, GONNR on 0872 862046. Tolecom(was STC) Social Club, Brixham Road. space GB Calls Paranton, D011011. Doors open 10am. Bring and 14 NOVEMBER 11 JULY buy. Talk-in on S22. Ample free parking. Re• BARNSLEY & DARC AR Rally Details Ernie. GALWAY Radio Experimenters Club - Annual hoshments and bar Details G3HTX, OTHR.. G4LUE. 0226 716339 (6prn•flpm please). have had to be RadioRally.Convent of Mecy.New-Towrtsmyth, 0803 526782. BRIDGEND & DARC Amateur Radio Rally. De- Galway. Doors open 12 noon Largo trade show tails 0656 722199 or 880434. and bring & buy. For the entire family. Free 30 AUGUST MARS/STOCKLAND Radio Rally. Details Nor- omited this parking and refreshmonts available. Talk In on HUNTINGTON ARS Annual Bank Holiday Mon. man, 08511E 021 422 9787. 2m. Details E1701B on 091 53592. day Rally. New Town Centre Venue at SI Germain HORNCASTLE AR Electronics and Computing Street. Huntington All pitches and car parking 21 NOVEMBER Fall. Queen Elizabeths Grammar School Sports on hard standing. Admission £1, car parking month Halt, Horncastle, Lincs. Bring and buy, club free. ICIam start Pitches £5 per car, £9 lor transit WEST MANCHESTER RC Winter Rally Details stands. calenng by Horneando Youth Club Staff van or car and trailer. Hot and cold food avail. 0204 24104 (eves).

RADIO COMMUNICATION June 1993 89 AMATEUR RADIO Quality DEE COMIV1 PRODUCTS

UNIT 1, CANAL VIE W IND. EST, BRETTELL LANE MORSE KEYS BRIERLEY HILL, WEST MIDLAN DS DY5 3LQ. from R.A. KENT ENGINEERS BRITAIN'S LEADING MANUFACTURER MASTS MAST SETS IN STEEL OR ALUMINIUM OUR STANDARD MASTS ARE SUPPLIED IN 4' x 5' INTER- SOLID BRASS MORSE KEY LOCKING SECTIONS IN THE FOLLOWING DIAMETERS. IN KIT FORM £36.50 Steel Ally * SPECIAL OFFER *

ASSEMBLED £45.95 11/4" dia £10.00 15.00 CAR BOOT SIZED 11h" dia £12.00 20.00 13/4" dia - 28.00 HANDY MAST 2" dia £18.00 36.00 «Pk" dia 5 section 20' total £12.50

HEAVY DUTY ALLY 10 G auge Thickness

TWIN PADDLE MORSE KEY 1/12 " dia 4 section £36. 2" dia 4 section £45. IN KIT FORM £45.50 Carriage on all masts £5 ASSEMBLED £57.95 VHF-UHF DUALBAND AND

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PRUE ES:it UNA!. KITS AND READY BUILT PRODUCTS Prices from A wide range of quality kits & modules for the home only £89 constructor WEATHER wIND SPEED M ONIT ORIN G MHECTION LINEAR WITH PREAMP, 2 or 4 or 6 metre versions, RF switched, Features (dependent on model) only migdm all mode SSB/FM/CW/DATA. Powers available, 2.5W in 25W out, • WIND SPEED & DIRECTION 5W in 25W out, 5W in 40W out, 10W in 40W out, state requirements • ELEGANT MAHOGANY CABINET (choice of light or dark) when ordering. AX adjustable gain 0-20dB. R X NF <1dB typical. Types TARP2S, TARP4S. TARP6S. BOX KIT £72.75, BOX BUILT • BAROMETRIC PRESSURE " OUTSIDE TEMPERATURE £98.25. • HUMIDITY & DEW POINT with MIN & MAX - C & F LINEAR AMPLIFIER, 2 or 4 or 6 metre versions, RF switched, all • MINI-ALL • COMPUTER INTERFACE (soon) 3 mode SSB/FM/CW/DATA. Powers available, 2.5W in 25W out, 5W in • SUNSHINE lira. 25W out. 5W in 40W out, 10W in 40W out, state requirements when • I2-24V or MAINS ordering. Types TA2S1, TA4S1. TA6S1, BOXED KIT £56.25, BUILT ^ £70.50. Send for colour brochure now W- TRANSVERTERS from 10 metres for 2, 4 or 6 metres. 0.5W output R& D AX gain 15dB, NF <1dB. Large box allows inclusion of 25W linear • amplifier, see below. Types TRC2-10, TRC4-10. TACS-10. PCB KIT ELECTRONICS £55.50, PCB BUILT £89.50, BOX KIT £78, BOX BUILT £116. Tel. (0843) 866662 TRANSVERTERS for lmW 10 metre drive, including buffer board, Far. (0843) 866663 otherwise as above. Types TRC2-10b, TRC4-10b, TRC6-10b. PCB neaufort House, Per 'r Ave. Kingsgate Broad%tairs, Kent. CTIn .?LB KIT £64.25, PCB BUILT £100, BOX KIT £85.75, BOX BUILT £132. TRANSVERTERS from 2 metres for 4. 6 or 10 metres, 0.5W output. Includes Interface to accept 0.5-5W drive. Types TRC4-2i (built only). TRC6-2i. TRC10-2i. New larger box to include linear. PCB KIT £64.25, PCB BUILT £100, BOX KIT £85.75, BOX BUILT £132. LINEAR AMPLIFIERS lo suit the transverters above. 0.5W in 25W 4E36 COMPUTER SYSTEMS ; Out. Types TA2S3, TA4S3, TA6S3. PCB KIT £60, PCB BUILT £80.75. MONO COLOUR SVGA FOUNDATION TRANSMITTER, FTX201 144MHz, 6 channel, 0.5W, VGA MULTISYNC CW & FM. Supplied with S20 crystal. PCB KIT £36.50, BOX KIT £49.50. 5X 25Mhz 750.00 .5130.00 COMMUNITY BROADCAST TRANSMITTER, 88-108MHz. 0.5W. PX 33M hz 905.00 1035.00 Wideband FM, meets the requirements of the DTI Restricted Service Licence. Synthesized 40 channel in 50KHz steps giving a 2MHz P2 50Mhz 945.00 1075.00 portion of the broadcast band. Audio passband 150Hz to 15KHz. Types CTX100. ready built £110.00. Also 25W continuous rated PX 50Mhz 1100.00 1230.00 matching Class C amplifier type TA100C3, ready built £110. Omnidirectional folded "J" aerial for the above, £30 inc P&P. 4Mke SAM. SV GA Card VAT VAT & P&P inc prices Send SAE for free full catalogue in 40Mb Hard Dick INCLUDED SPECTRUM COMMUNICATIONS Teepee Technical Services Unit 4 Grove Trading éstate. Dorchester. Dorset. Tel 0305 262250 Opening limes: 9-1 2-5 Tue -Fri, 9-1 Sat. Closed Sun & Mon 081 699 2624

90 RADIO COMMUNICATION June 1993 SO M E OF THE RS G B'S TEA M OF VOLU NTEE R EXPE RTS - AVAIL A BLE TO HELP YOU

• RSGB Policy Matters WARWICKSHIRE (Zone B)- see (Zonal Council under Northamptonshire. member):- RSGB Liaison Officers (J-Z) WESTERN ISLES (Zone G) - see under Highland. Zone A (North of and Honorary Officers WEST GLAMORGAN (Zone E) England): - Mr E Hays, GW3RGL, 23 Peter Sheppard, G4EJP, 89 St The Society has a large number of volunteer experts available Edgemoor Drive, Upper Killay, Catherines Drive, Leconfield, to help and advise members on a wide variety of subjects. Swansea SA2 7HH. Tel 0792 Beverley, North Humberside Each month we will be focussing on a different section of the 207822. HU17 7NY. Tel: 0964 550397. volunteer workforce, whilst still giving brief details of the WEST MIDLANDS (Zone B) - main office-holders. See also the Information Directory section Mr P Morrell, G4TMK, 22 Zone B (Midlands): of the RSGB Call Book. Chudleigh Road, Erdington, Bir- John Allen, G3DOT, 4 Philip Av- mingham B23 6HB. Tel No. 021 enue, Waltham, South Humber- 382 8494. side, DN37 00D. Tel: 0472 WEST SUSSEX (Zone C) - Jim Catlow, G4ARP, 137 Haven ORKNEY (Zone G)- Bill Wright, 825899. R Harris, G4DRV, Upton, Lane, Moorside, Oldham, Lancs GM3IBU, Crosslea. Berstane Crowborough Hill, Crowborough, Road, Kirkwall, Orkney KW15 Zone C (SE England and OL4 200, Tel 061 652 8617. East Sussex TN6 2DA. Tel 0892 1SZ. East Anglia): LEICESTERSHIRE (Zone B) - 655894. Gwynne Harries, G4WYN, 1 St Neil Lasher, G6HIU, 61A Stile OXFORDSHIRE (Zone D) - WEST YORKSHIRE (Zone A) - Michael's Close, Ashby-de-la- Arthur Kinson, GOKOC, 29 Hall Gardens, London W4 3BT. Mr D W Allan, GORZP, 283 Cliffe Zouch, Leicestershire LE6 5ES. Foxhall Road, Didcot, Oxon OX11 Tel: 081 747 4045. Lane, Gomersal, Cleckheaton, W Tel 0530 417307. 7AQ. Tel 0235 815399. Yorks BD19 4SB. Tel 0274 Zone D (SW England): LINCOLNSHIRE (Zone B) - see POWYS (Zone E) - Paul Essery, 872244. under South Humberside. GW3KFE, 287 Heol-y-Coleg, Julian Gannaway, G3YGF, Dean WILTSHIRE (Zone D) - Ron LOTHIAN (Zone G) - David Vaynor, Newtown, Powys SY16 Hill Barn, East Dean. Salisbury, Freeman, G4XTH, 90 Allington Milne, GM1YXM. 13 Caledonian 1AR. Tel 0686 28958. Wiltshire SP5 1HJ. Tel: 0794 Way, Chippenham, Wilts SN14 Place, Edinburgh EH1 2AW. Tel 40008. SHETLAND (Zone G) - Pete OJU. Tel 0249 650800. 031 313 2882. Weller, GM3X0Q, Heimli, Zone E (Wales): MERSEYSIDE (Zone A) - Keith Levenwick, Shetland Isles ZE2 HF Awards Manager - Bill Brooks, GOSPH, 43 Norton Wood 9HX. Tel 0950 2354. Clive N Trotman, GW4YKL, 19 Ricalton. G4ADD. Park View, Dolau, Llanharen, Lane, Windmill Hill, Runcorn, SHROPSHIRE (Zone B) - David VHF (and Microwave) Awards Pontyclun, Mid Glamorgan CF7 Cheshire WA7 6C/G. Tel 0928 Whalley. G4EIX, 1 Lees Farm Manager- Ian L Cornes,G4OUT. 9RZ. Tel: 0443 226198. 701096. Drive, Madeley, Telford, Salop MID GLAMORGAN (Zone E) - TF7 5SU. Tel 0952 588878. HF Manager - Martin Atherton, Zone F (Northern David Jones, GW1SQT, G3ZAY. SOMERSET (Zone D) - Post va- Ireland): 'Beridale', 41 Penrhys Road, cant -referto Zonal Council Mem- VHF Manager - Dave Butler, Ystrad, Rhondaa, Mid Glamor- Ian Kyle. GI8AYZ, 1 Portulla ber. G4ASR. Drive, Pond Park Road, Lisburn, gan CF41 7SJ. Tel 0443 435309. SOUTH GLAMORGAN (Zone E) Microwave Manager - Mike Co Antrim BT28 3JS. Tel: 0846 NORFOLK (Zone C) - Bill - see under Mid Glamorgan. Dixon, G3PFR. 665034. Higgins, G3PNR. 65 Hayden Emergency Communications Court, Eleanor Road, Norwich SOUTH YORKSHIRE (Zone A)- Officer - John Irving, G4XJT. Zone G (Scotland): NR1 2RG. Tel 0603 629150. Mr A Whitehead, G4JK W, Laburnum Cott, 3 Darley Yard, Ian Suart, GM4AUP, 37 Meldrum NORTHAMPTONSHIRE (Zone Intruder Watch Co-ordinator - Worsbrough Dale, Barnsley, S Mains, Glenmavis, Airdrie, Lan- B) - Mr D J Linnell, GOMJK, 19 David Owen, GOOES. Yorks S704SB. Tel 0226299031. arkshire ML6 OQG. Tel: 0236 Beech Avenue, Northampton Morse Practice Transmissions 765937. NN3 2HE. Tel 0604 711647. STAFFORDSHIRE (Zone B) - Co-ordinator - Post Vacant. Ken Parkes, G3EHM, 41 NORTHUMBERLAND (Zone A) Project YEAR Coordinator - Goldborn Avenue, Meirheath, • For general advice and - Jack Swayne, G3BLE, 12 The Hilary Claytonsmith, G4JKS. details on local clubs, Haven, Beadnell, Chathill, North- Stoke-on-Trent, Staffs ST3 7J0. Amateur Radio Observation or if you don't know umberland NE67 5AW. Tel 0665 Tel 0782 397240. Service Co-ordinator - Geoff who to contact:- 720601. STRATHCLYDE (Zone G)- Post Griffiths, G3STG. Your RSGB Liaison Officer. NORTH YORKSHIRE (Zone A) vacant - refer to Zonal Council Trophies Manager - Bob - NE of Rivers Ouse and Swale: Member. RLOs (A-I) appeared in Harrison. G4UJS. 'Bob' Wilkinson. G4YKO, 8 SUFFOLK (Zone C) - see under last month's At Your IEE Liaison Officer- Peter Saul, Laughton Avenue. Scarborough, Norfolk. Service. N Yorkshire Y012 5DB, Te10723- G8EUX. SURREY (Zone C) - see under JERSEY (Zone D) - Syd Smith, 352823. SW of Rivers Ouse and Chief Morse Test Examiner - Greater London (South). GJOJSY, 31 Jardin -A -Pommiers, Swale: Gareth Foster, G1DRG, Roy Clayton, G4SSH. Patier Road, St Saviour, Jersey. 19 Asquith Avenue, Burnholme, TAYSIDE (Zone G) - see under Society Historian - George Tel 0534 38996. York YO3 OPZ. Tel 0904421392. Fife. Jessop, G6JP. KENT (Zone C) - Fred Stewart, NOTTINGHAMSHIRE (Zone B) TYNE & WEAR (Zone A) - J I Audio Visual Library Coordi- GOCSF, Shingles, Ingleborough - Mrs Mary Lowe, GONZA, 25 Batley, GOIID, 3 Folldon Avenue, nator- David Simmons, G3JKB. Lane, St Mary's Platt, Sevenoaks, Manor House Court, Kirkby-in- Fullwell, Sunderland, Tyne and Kent TN158JU. Tel 0732780721. Ashfield, Nottingham NG17 8LH. Wear SRS 9HP. Tel: 091 548 OSL Bureau Liaison Officer - LANCASHIRE (Zone A) - Bob Tel 0623 755288. 3301. John Hall. G3KVA.

RADIO COMMUNICATION June 1993 91 Built-in Matching Unit Nylon

Nylon Tune Not much room for an antenna? Keen on camping? Need a cheap antenna? Available Meet the Panther 'End fed' antenna - it's amazing! for any HF band Designed specifically for use in restricted space or for the 'out and about' - Top to Tent amateur, the little Panther is ideal for campers, caravanners, up-the-river * CAMPING men, portable work, small flat dwellers and tiny loft installations etc, etc. Typical 14Mhz at LONGLEAP SWR Just throw it up, take it down and pop it in your pocket! VSWR figures: See it Meter Maximises efficiency with ATU at the feed point. Supplied for any HF band. 14Mhz - 1.4:1 demonstrated Ready to use - just connect your coax (BNC), trim ATU and transmit. It at our own 14.125Mhz - 1.16:1 caravan 14.26Mhz - 1.6:1 works a treat! Transmitter ONLY (Max. 7 Watts) Call 0480 433156 to order or write or fax to SEE THE 'SPRA T £39 G8PG REVIE W HESING TECHNOLOGY inc VAT and P&P October'92 Cromwell Chambers, 8 St. John's Street, Huntingdon, Cambs PE18 6DD (Fax: 0480 413357) O Hosing Tec hnology 1992

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92 RADIO COMMUNICATION June 1993 NOT WAVING BUT STANDING ARTWORK THE PUBLICATION in Technical Topics (April) and the I THINK THAT members should be made aware that second part of 'How Big is a Bad SWR in the same HO will now supply PCB artwork for projects appearing issue was a happy coincidence. In the TTarticle G3NXC in RadCom only to the (kit) trade. writes of the SWR myths that still appear in various Bruce Edwards G3WCE articles including those by people who really should know better. Later on G2HCG hates the wretched f'Ibis statement isn't strictly true (11111 rather misses PL259 plug. the point. A PC/3 design, which must be reproduced May I add my two penn'orth/ The 'Bad SWR' article 'same size' and is frequently double-sided plus a was useful but it really doesn't need a standing wave to conanment overlay, e011S11111eS too much space for make the reasoning. Just consider a simple dipole with the relatively few nrembers who will make their own centre impedance of 7512 connected via a balun to a PCBs, especially fori'omplex projects. Board layouts coaxial feeder also of 75Q. This condition is covered in THE RIGHT ATTITUDE are public/eel from time to tinte - see this numth's the definition of SWR in the first of the articles. But marker OIl it. More to the point, many authors do not where is the standing wave? The load is purely resistive TO GIVE MICHAEL Nokes, GOTDT, ( The provide PCB details and it is only because we ask and the load line will be a line and not an f. and of course Last Word, May) some encouragement, suppliers such as Badger Boards lie design ri board care must be taken about incursions into the forbidden might I be allowed to relate the following rhar one is available a f all. 11 is our policy to arrange areas. But there is no standing wave- just a mismatch. story? When I joined the RAF just after the for more and 11141Te projects to have kits and boards Incidentally, the article staled that the power dissipa- war. I was posted to No.3 Radio School to available as individual component supplies become tion at the collector is le certainly the power x V. That is more difficult ir) olnain. If you do %CUM to make your input, but some power goes out to the aerial (maybe train as a radio operator. The intake con- own hoard, an SASE to the author inas well bring 50%) so the collector only has the rest to dissipate. sisted of 200 men. After we had been on results - Ed/ G2HCG doesn't like the PL259 plug. but I suggest the course for a month or two, it became that it is adequate on HF and not too bad on VHF. It is apparent to those in charge that all was about 2cm long and therefore 0.02 wavelength long on not well as many were having consider- a transmission at a wavelength of 1m. Put this on a ODD ODE ON COMPULSORY CODE able trouble with the Morse. Smith chart and the resultant effect is surely negligible. in nineteen hundred and thirty eight We were duly paraded one morning J K Todd G2KV 1 heard ham radio, thought it great. before Squadron Leader Smith, who asked In nineteen hundred and forty four those who thought that they might not My Morse was pushed to toile', no more. ONE MAG FOR ALL pass the course to step forward. Quite a In forty nine, a spirit tree, On several occasions I have written to the Society on lot did, and later I discovered that only 31 1 was exempt from the RAE. the subject of RadCom contents. pointing our that some of us were going to remain whilst the Surplus bits then home I'd bring of us are butchers, bakers and candlestick makers, and others would be posted to take up new not electronic boffins able to comprehend very techni- Enough to make 'most anything. cal articles. This has now been largely remedied by the trades. Some told me that the Morse was introduction of the Novice. It could be self-defeating if making them ill. while others couldn't sleep But Morse was kept my hopes to parry you are going to continue a separate publication, D-i-Y at night thinking about it. For me there was no George Three Harry, Radio (costing money), for articles aimed at, and suit- I came to the conclusion that to be And when I asked what 'twas about Some hams said "It's to keep you out." able for, the butcher, baker and candlestick maker, and successful at learning Morse code, you allow Radcomto continue as is. though in the improved form developed over recent years. have to have a special attitude of mind, as On this 'twas natural to frown Reading The Leader, April, gives some hope of a with most things, and if you don't have it And wish the PO'd close all down. step in the right direction, but I still believe two publica- you will struggle. Those with the right It's not enough to SWL tions to be a mistake. Why should the Novice have to attitude can easily say it's a pushover, but When you want to join in as well. pay for two magazines? Radcom must be an all em- that's nonsense, and if my figures are bracing publication, suitable for all members. and that And Class B did not help the man anything to go by only one in seven has all our members want. Whose purpose was to work Japan this right mental attitude. It's a case of (Eleven metres was a rage John Barker G3SAZ what you're given when you're born and Some won't want mentioned on this page). I I agree totally that RadCom should be all-embracing certainly nothing to feel guilty about. and hare tried to broaden its technical base by At fast with help from such another Years later I worked for the then Air including both simpler and more complex articles And a lot of useless bother than would !tare been included ajen' years ago. To Ministry as a radio operator where the Two years hard with quite no zest nulled' in RadCom flu. cameras of D-i-Y Radio (the Morse qualifying speed was 28WPM in six Scraped me through that awful Test. equivalent if tuvehy, extra pages for beginner months, and again I saw the same prob- every m(1nth) would destroy du, delinne balance lem arise. But the Diehards won, or near enough, between these illy) extremes - Ed/ Now that Michael has passed, I wish I'm on an HF site quite duff. And of course there are no tears him luck and would advise him to listen to I could retrieve the vanished years. good automatic Morse to start with, just to YOUR SOAR-A WAY RADCOM? get the feel of it, and never to send faster And so again they won't be tricked IN THE LIGHT OF current (and what seems to be than you want to receive, something badly They've gone and made the Test more strict. popular commercial) practice, tras the editorial man- neglected on the amateur bands today. (Some had lo learn their code. I think. agement of the RSGB considered using a tabloid for- When ¡he option was CE3'. or Clink!) mat in preference to what is now being produced? Harold McIntyre G3FLJ Tabloid production not only capitalizes on more effi- Now it is odd, 1 do agree. cient typesetting systems and much lower cost printing- That radio 1 did not flee; presses, but more importantly, the paper stock is far A lot lust say The hell with it!" cheaper! Other benefits include greater page design And love us not one little bit. flexibility. And as a direct result of this, advertisers, on SOUND IDEA a cost for cost basis have more space in which to I SUGGEST THAT consideration should be given to the A point that you should heed, I guess, hammer home their respective messages! Without it preparation of an audio cassette on which is recorded When radio needs more friends, not less. costing them extra monies. examples of the numerous types of signal, including This would benefit everyone in the long-term (and the interference, heard on the air, together with their iden- A L Dick. GMOIRZ short-term for the matter). There is bound to be an tification. Examples from as much of the radio spectrum emotional lurore but if we concentrate on the rationale. as possible should be sampled from both UK and 'CB: Confined to Barracks, not that CB proscribed by I'm confident that most members will 'see the light' foreign sources. the RSGB. eventually. Hands up those members who support the I recall that an illustrated lecture on this subject was idea of Radcom going tabloid? given some time ago by a *G' but I have no details. His Ray J Howes G-tO WY assistance could be of great help. I feel sure that radio THANKS LORD RIX amateurs would welcome the chance of obtaining such information at a reasonable price to help sort out the I HAVE JUST received my prize for the MENCAP RESTORE THE BALANCE bewildering variety of sounds and signals heard on their Albania Appeal! Thank you very much, the G4ZPY receivers. Pump-Action Morse Key is super - so listen out for me I HOPE THE Society will be sure to trace and acknowl- sometime, (usually on CW). edge with the highest honour in its power, the amateur • T Moore G3AJD who has from the most appalling situation in Srebenica We are very pleased the Appeal was a success; very provided daily contacts with the authorities. It is unlikely worthy! Whatever sense of humour I have. I owe it all to that the lay press will afford anything like the publicity it two terrific entertainers: Brian Rix and Norman Wis- Please note that the views expressed in The Last gleefully gave to the avaricious scanner-operators - dom! I am probably giving away my age, but these two Word are not necessarily those of the RSGB. We unfortunately labelled 'radio hams' - who monitored, had me rolling from a very lender age - bring back the reserve the right to edit letters for publication. All recorded and sold private conversations, but let us at old days! Thanks Brian for bringing MENCAP to our letters are acknowledged and may be passed to least attempt to restore the balance. attention. the relevant department or committee. Peter Jackson G3ADV David Jelly A451J (G4U08)

RADIO COMMUNICATION June 1993 93 P R I C E S N O L O N G E R IN C L U D E P O S T A N D P A C K I N G

D-I-Y RADIO SUBSCRIPTION (RSGB) NORTH AMERICAN CALLBOOK 1993 RADIO COM MUNICATION HANDBOOK A 24-page magazine for beginners of all ages. (RACI) (((SOB) Published six times a year, it Includes simple ((19.50) £16.58 A comprehensive guide to the theory and prac- construction projects, kit reviews, posters, ham tice of amateur radio wh ich. although published facts, prize competitions and special otters some years ago. still represents excellent value UK CALLBOOK 1993 (RSGB) Six copies: ((9.00) C7.65 for money. 779 pages Prices include UK postage. Over 60,000 UK and Irish callsigns listed plus ¡(11.00) C9.35 a wealth of essential informiftion for the radio amateur and short wave listener. Novice call. FIRST STEPS IN RADIO (ARAL) signs are also featured for the first time. SOLID STATE DESIGN FOR THE RADIO Doug Outlaw. W1FB 433 pages. ((9.50) £7.00 AMATEUR (AMU) ((5.50) (4.68 W Hayward, W7Z01 I Doug DeMaw. W1FB An essential guide or the amateur designer and constructor. 256 pp. ((9.25) £7.87 HOW TO PASS THE RAE (ASGO) EMC Clive Smith, G4FZH. and George Benbow, (Breakthrough) W1FB'S DESIGN NOTEBOOK (ARAL) G3HB Doug °Maw, W1FB A companion to the RAE Manual, this book Simple, practical projects for the HF bands contains some excellent practical advice on Antennas INTERFERENCE HANDBOOK (RPI) 195 pages ((5.75) C4.89 how to pass the exam and has nine sets of William Nelson, WA6FQG typical papers (and their answers) on which lo ANTENNA COMPENDIUM VOLUME How to locale and cure RFI in amateur facto), 1 practice. 84 pages. ((6.50) £5.53 CO radio and power line problems 250 pages. (ARRL) ((8.75) £7.44 G L Hail, KlTD, P Rinaldo, W4RI, History Thompson. KA1DYZ THE NOVICE LICENCE STUDENT'S A collection of antenna articles with someth,ng NOTEBOOK (RSGB) RADIO AMATEUR'S GUIDE TO EMC THE BRIGHT SPARKS OF WIRELESS tor everyone 175 pages ((10.25) £8.72 John Case, GW4HWR (RSGB) (RSGB) The official textbook for the RSGB Novice ANTENNA COMPENDIUM VOLUME 2 Robin Page-Jones. G3JWI George Jessup. G6JP Licence Training Course and essential reading This essential guide helps you avoid EMC This is the story of the radio amateurs from (ARAL) for the prospective Novice Licensee. 70 pages. problems and assists in diagnosis and cure of Marconi to the 'secret listeners' of WWII, who Jerry Hall, K170 1(5.29) (4.50 any which occur, not forgetting advice on how laid down the foundations ol circuits and p roce - 208 pa vi ((10.25) £8.72 to deal with neighbours. NEWI(C6.50) £5.55 du res that wean now take tor granted. 90 pages ANTENNA COMPENDIUM VOLUME 3 PRACTICAL ANTENNAS FOR NOVICES hardback ((9.75) C8.29 (ARAL) (RSGB) RADIO FREQUENCY INTERFERENCE NEW! (13.50) £11.78 John Heys, 03600 (ARAL) THE ARAL ANTENNA HANOBOOK (ARRL) (C4.49) £3.83 ((12.00) C10.20 Log Books and Log 16rm EctIol (16.50) C14.03 Sheets BEAM ANTENNA HANDBOOK (API) William Orr, W6SA1/Stuart Cowan. W2LX LOG BOOK - TRANSMITTING (RUB) Everything you need to know about beam de- Always Have the RSGB's Telephone Sign, construction and operation in this new A4 size. spiral bound ((2.45) £2.09 2nd edition 268 pages ((7.50) £6.38 Number to Hand LOO BOOK - MOBILE (RSGB) HF ANTENNA COLLECTION (RSGB) Miniature handy log ((0.80) C0.42 Erwin David, G4L01 RadCom articles from 1968-89. A wealth DI • RSGB PENCIL: 22P information on antennas, feeders, tuners, LOG BOOK - RECEIVING (RUB) balunS. testing, modelling and the mechanics A4-sized with columns for both stations in the of mounting an antenna safely. 233 pages. I II C/SO. ((3.25) £2.77 ((9.50) £8.08 I RSGB BUG: 50P II HF ANTENNAS FOR ALL LOCATIONS LOO BOOK COVER (RSOB) Smart plastic cover to keep an A4 log in mint (RHO) II II condition. ((4.25) C3.62 Les Moxon, G6XN RSGB BOOKMARK: 75P Tho completely revised and greatly expanded II II 2nd edition of this popular book. A wealth of LOO SHEETS (RSGB) practical information on choice and construc- II RSGB KEYRING: 50P I Available for HF contests or VHF contests tion of antennas. NEW! ((13.50) £11.48 II II (specify which). 100 sheets. ((4.00) £3.40 PRACTICAL WIRE ANTENNAS (RSGB) John Heys, 031300 Wire antennas offer one of the cheapest ways Il OR ALL FOUR FOR ONLY £1.50 II Maps/Charts/Lists to put out a good signal on the HF bands and II I this popular guide has something to interest every amateur on a budget. 96 pages. BEACON AND REPEATER LISTS (MOB) ((13.00) £6.80 Remember, We are Here Up-to-date lists p repared on the Society's corn- outer. Pack of three: (i) UK beacons, (ii) Region REFLECTIONS: TRANSMISSION LINES 1 beacons: (ill) UK repeaters. to Help and are Just a Call Away Pack: ((1.00) C0.85 AND ANTENNAS (ARAL) (13,25) 11.27 COUNTRIES AND AWARDS LIST (RSGB) RADIO AMATEURS' EXAMINATION ((1.00) £0.85 TRANSMISSION LINE TRANSFORMERS MANUAL (RSGB) General Technical (ARAL) George Benbaw, G3HB Jerry SevIck, W2FMI GREAT CIRCLE DX MAP (RSGB) This is the stanaard textbook that almost every AMATEUR RADIO TECHNIQUES (RSGB) A comprehensive guide to designing and con- radio amateur needs to study In order to pass This popular station accessory shows the bear- Pat Hawker, G3VA structing this type of transformer 247 pages. the RAE. 1(6.50) CL53 ing in degrees from London of any DX station ((13.50) C11.413 Ropnrit of the 711, edition Avery largo selection and is invaluable for the HF operator using a of circuit ideas and devices, information on beam antenna. Available axa wall map in three antennas and related topics plus many con- colours, size approx 24 by 32in. RAE REVISION NOTES (RSGB) structional hints from RadCorris popular Tech- ((2.00) £1.70 Awards nical Topics feature. 368 pagos Also available as a handy Al card for tine desk George Benbow, G3HB (17.50) £6.38 printed In black ((1.00) 10.85 A pocket-sized summary of the RAE Manual AWARDS BOOK (RUB) AMATEUR RADIO Just right for revising anywhere any time. Cris Henderson, G4FAM 92 pages NEW (14.001 (3.50 GRID LOCATOR ATLAS (ARAL) A compilation of all the world's popular and ARAL HANDBOOK 1993 (ARAL) obscure awards which is suitable for the avid Larry Wolfgang, WA3VIL, and Charles ((3.50) 12.49 parchment chaser. Fully referenced and with Hutchinson, K8CH many checklists_ 188 pages. ((9.50) £8.08 TRAINING FOR THE NOVICE LICENCE - Tho largest and most up-to-dale guidel0 every LOCATOR MAP OF EUROPE (RSGB) INSTRUCTOR'S MANUAL (RSGB) aspect of amateur radio_ the new edition has Covers the whole of Europe from Iceland and John Case, GW4HWR something interesting for everyone, from the Finland to North Alrica and the Black Sea, and Í Beginners and The official guide for instructors 101 pages beginner to the more experienced amateur. shows the medium locator squares. eg KN80, mehool £5.10 1215 pages hardback ((16.50) £14.25 as well as country prefixes Available as a wall Novices map, size approx 22 by 24 in. (C1.25) C1.07 Also available as an A4 card for desk AMATEUR RADIO FOR BEGINNERS HINTS AND KINKS FOR THE RADIO ((0.75) C0.64 (RSGB) AMATEUR (ARAL) Victor Brand. G3JNB Call Books Charles Hutchinson, K8CH, and David WORLD PREFIX MAP (RSGB) Suitable tor all ages, this new book explains Newkirk, AK7M This is a superb full.colour wall map. measur- how to build a crystal sol, how lo listen to A collection of practical amateur radio ideas ing approx 1200 by 830mm. It shows amateur shortwave radio, and how to become a radio INTERNATIONAL CALLBOOK 1993 (RACI) gleaned from the pages of OST magazine. 147 radio prefixes, world limo zones. IARU locator amateur. 65 pages. ((3.50) £3.50 ((19.50) £16.58 pages. ((5.00) £4.25 grid squares, 8 much more. ((2.50) £2.13

RETAIL PRICES ARE IN BRACKETS, FOLLO WED BY ME MBERS SPECIAL DISCOUNT PRICES

94 RA DIO CO M M U NIC ATION June 1993 S E E B E L O W F O R O U R N E W ORDER I N G D E T A I L S

SATELLITE EXPERIMENTERS' Microwaves ORP (Low Power) HANDBOOK (ARRL) Martin Davidoff, K2UBC MICROWAVE HANDBOOK (RSGB) G-QRP CLUB ANTENNA HANDBOOK Technical guide for the experimenter, including Mike Dixon, G3PFR (G-QRPC) data on amateur. TV and weathersyslems 334 Three volumes giving theory and practical de- pages (C12.75) £10.84 Edited by P Linsley. G3POL and signs for the microwave enthusiast. T Nicholson, GWOLNO Volume 1: operating techniques. system analy- SPACE RADIO HANDBOOK (RSGB) A compilation of antennas, matching units and sis and propagation, antennas, transmission John Branegan, GM4IHJ associated articles from SPRAT. the CORP lines and components. semiconductors and Tho riront comprehensive guide to space radio club Journal 155 cages (C5.751 £5.00 valves. 224 pages. (C9.50) £8.08 Communications Covers propagation, meteor Volume 2: construction techniques, common scatter, moonbounce. satellites. manned space G-ORP CLUB CIRCUIT HANDBOOK (RSGB) equipment, beacons arid repeaters, test equip- vehicles and even simple radto astronomy 242 George Dobbs, G3RJV ment. safety, tillers and data. Pages (C12.00) £10.20 (C14.50) £12.33 If you like construction. and want to build some Volume 3, lust published, contains practical simple circuits that work, this is the book. It is a designs for each band from 1.3GHz to 24GHz pot-pourri of eight years of the best articles that and beyond. A must for anyone active on the have appeared in Sprat - the lournal ot the G- Short Wave microwave bands or contemplating 'life be ORP Club. 96 pages (C6.75) £5.70 70ce: (C14.47) £12.32 Listener (MP CLASSICS (ARRL) Special offer to RSGB members only - All Bob Schetgen. KU7G OTHER three volumes for iust £25.50 Best CRP pro;ucts 'rom OST and the ARRL COMPLETE SW LISTENER'S HANDBOOK Handbook. 274 pages. (C11.00) £9.35 (TAB) PRODUCTS (C18.25) £15.52 Morse Code 0S7' Magazine WORLD RADIO AND TV HANDBOOK 1993 (RPI) Badges, clothing, MORSE INSTRUCTION TAPES (ARRL) (ARRL) ((15.75) £13.39 Three sets covenng 5 to 10, 1010 15 or 15 to sundries (members 22WPM. Each set consists of two cassettes. One year (Airmail): (C88.24) £75.00 only) Price each (please specify speed)• One year (surface mail): (C34.41 ) £29.25 (C10.50) £8.93 Two years isurface triait) ' (C70.73) £60.12 Special Modes Three years (surface mail) (C103.24) £87.75 BADGES AN INTRODUCTION TO AMATEUR MORSE CODE FOR RADIO AMATEURS OAP one year (surface mat Callsign (standard)* £3.00 (C30.88) £26.25 TELEVISION (BATC) (RSGB) Callsign (deluxe)* £3.50 Replacing two previous BATC books Amateur George Benbow, G3HB Please wait 9(1 days before expec:,figuen,ary. Television and The ATV Handbook. it provides Lapel (mini) £1.00 Completely new version of this popular guide. OAPs - please send proof &age with subscrip- Information on everything from basic principles Lapel (standard) £1.00 Suitable for UK 5WPM and 12WPM tests. 32 tions. Pricos include postage. to a completo ATV station. Pairs (C3.51) £2.98 " Includes engraving. ((5.00) £4.25 MEMBERS' HEADED NOTEPAPER MORSE CODE STAGE 1 - 5WPM (RSGB) THE ATV COMPENDIUM (BATC) RadCom Back 100 sheets octavo £3.00 A cassette for the Novice Mors,: : Mike Weeding, G61061 (C4.50) £3.83 Issues & Binders An invaluable collection of v.deo circuits which 100 sheets quarto £5.50 replaces the TV Handboffit (E5.75) £4.89 BOUND VOLUMES RSGB TIES MORSE CODE THE ESSENTIAL 1990.1991 and 1992. Some other years avail- SLOW SCAN TV EXPLAINED (BATC) New style, available in navy or maroon LANGUAGE (ARRL) able, please ask. (E22.00) £18.70 Mike Wooding, G610I'.1 Post Free £6.00 Peter Carron Jr, W313KV NEW! ((5.00) £4.25 All about Morse code from how to learn il to BACK ISSUES correct operating practice. (C5.00) £4.25 Please phone for availability (C3.50) £0.50 NOSINTRO (DOWERMAIN) Car Stickers Ian Wade, G3NRW EASIBINDERS Brighten up your rear window) Styles are: 'I The definitive guide to the KA90 Network Op- Keep your RadComs neat and safe In these Love Amateur Radio', 'I'm .5, are erating System (NOS) Practical information monitoring Operating aids instant b nders £5.00 you?' (2 Colours). and *I'm on the air with on using TCP/IP over packet radio. amateur radio' (4 colours). NEW! (C11.50) £10.00 ((0.75) £0.64 ARRL OPERATING MANUAL (ARRL) There is also an RSGB diamond car sticker. Robert Halprin, K1XA PACKET RADIO PRIMER (RSGB) (Members only) £0.64 A most comprehensive and up•to•date guide to RSGB Newsletters Dave Coombe', G8UVZ, and Marlyn Croft, amateur operating. 684 pages G8NZU (t11.75) £9.99 DX NEWS SHEET A tight-hearted introduction to packet radio. A 'must' for all serious DX operaterS, It pre:ivies EMC Filters Detailed practical Wince and an operating details of special and rare station activities on guide, plus much reference inf ormation 138 AMATEUR RADIO OPERATING MANUAL the HF bands, as well as key sotarigeomag- FERRITE RING TOROID Pages (C7.00) £5.95 (RSGB) netic data. Weekly. (C28.241 £24.00 Pack of 2 ( .25) £3.63 Ray Eckersley, G4FTJ An excellent reference. Topics include DX. MICROWAVE NEWSLETTER FILTERS contests and mobile operating, and It features Contains technical infonnation, operating news, VHF/UHF Filter 1 • Braid Breaker. Filter 2 - High Pass lot a 38-page appendix with licensing details and events, and a saleAvantedcolumn. 10 per year. FM Broadcast Band 2. Filter 3 - High Pass for prefixes. 204 pages. IC6.75) £5.74 (E9.40) £7.99 UHF TV. Filter 4 - Notch Tuned to 145MHz. Free samplesol newsletters (and rates loteen- RADIO AURORAS (RSGB) EC and all other overseas subscnbers) am Filter 5 - Notch Tuned to 435MHz. Filter 6 • Charlie Newton, G2FKZ DX EDGE (XANTEK) available 017 mouest from RSGB Sales. Prices Notch Tuned to 50MHz. Filter 7 • Notch Tuned An aid to calculation of the optimum path for This new book gives a technical account of the include postage. to 70MHz. Filter 8 • Six Section for UHF TV. grey•line communication on HF latest research into how auroras are caused. Filter 10 - Notch Tuned to 28MHz. Fitter 15 • (C14.00) £11.90 how they can be fOreCast, and how best to use Notch Tuned to 21MHz Filter 20. Notch Tuned them to work DX (C7.00) £5.95 to 14MHz. Filler 8 pocesare (C21.501£18.28 All others are ((8.50) £7.23 INTERNATIONAL VHF -FM GUIDE (B&P) Satellites VHF/UHF MANUAL (RSGB) Julian Baldwin, G3UHK, and Kris George Jesse'', G6JP Partridge. G8AUU SATELLITE ANTHOLOGY (ARRL) The standard guide to theory. techniques and Complete world listing of repeaters and bea- The best of recent OST articles on satellite equipment for amateur radio transmission and REMEMBER TO ADD POSTAGE cons, plus detail on UK repeaters 128 pages. operation and hardware. 97 pages. Second reception at VHF and UHF 511 pages TO ALL PURCHASES (C3.00) £2.55 edition. NEWS ( E5.75) C4.89 (C10.25) £8.72

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PRICES. Retail peces are in (brackets) followed by members' Newsletter and magazine prices include postage. Overseas ORDER FROM: riscounted prices. If you are a member, please quote your call Airmail and first class UK post prices aro available on request signor RS number when ordering. All peces include VAT (where RSGB SALES (CWO) applicable) and are subject tochange without notice. Please add AVAILABIUTY. Goods are available over me coo nay at RSGB postage as follows: Headquarters 9.15am to 5.15pm. Monday to Friday. However. Lambda House, you are strongly advised to confirm availability of goods by Amount UK Post Overseas telephone before visiting Headquarters. Cranborne Road,Potters Bar, of Order and Packing Surface PAYMENT. Payment may be made by post enclosing a cheque UP to ft post free post free or postal order. These should be crossed and made payable lo Herts EN6 3JE 'Radio Society of Great Britain'. il sending cash please use lip to £5 (1.00 £2 50 registered post. We accept Visa and Access (Mastercharge) f5.01-£10.00 (2.00 £330 cards and our telephone number for credit-card orders is (0707) plus AMEX & £10.01-f 1 5.00 £3.00 £4.50 1.1 659015. Our Giro account number is 533 5256. 7 1 £15.01-C20.00 £4.00 £5.50 DINERS CLUB DELIVERY. Goods will be despatched lo UK destinations by Inv £20 01-£25.00 £5.00 £6.50 2nd class letter post or parcel post, or surface mail to overseas f25.01 and above (6 00 £7.50 destinations. Please allow 28 days for delivery. Credit card hotline: 0707 659015

RADIO COMMUNICATION June 1993 95 CLASSIFIED COMPUTER SOFTWARE HARDWARE G4TYE LOGS, PC compatibie. Amiga, Commodore, BBC. Try before you buy. ADVERTISEMENTS SAE for free demo disk. State size. 64 Gurney Valley, Bishop Auckland, DL14 8RW, 0388 607500. Classified advertisements 55p per word (VAT Incl) minimum 14 words (£7.70). G4BMK PACTOR - See display advert this issue. Grosvenor Software. 2 Please write clearly. No responsibility accepted for errors. Latest date for Beacon Close; Seaford, Sussex. acceptance - 5 weeks before 1st of issue month. G4UXDs CELEBRATED MORSE TUTOR. "IBM-PC's, BBC's." compatibles. All classified advertisements MUST be prepaid. Adjustable speed, delay, letter frequency; 100 tests, attach your key, +++++I NB: CHEQUES SHOULD BE MADE PAYABLE TO RSGB. £8.95. SAE details/TRIAL: D. Brandon, 1 Woodlands Road, Chester CH4 8LB. SUPER-DUPER by E15DI: Don't even think of the IOTA or IARU contests Copy and remittance to: Victor Brand Associates Ltd, 'West Barn', Low without it! £20. OTHR. Common, Bunwell, Norwich, Norfolk, NR18 1SY. DXCC DATABASE SOFTWARE FOR PC COMPUTERS. Record countries NB. Members' Ads must be sent to "Members' Ads," RSGB Hq. heard or worked by band, mode, location, date and power level. Multiple summary displays and list formats including customised database searches. All DXCC countries built in. Easily modified for locators etc. Interrogate for FOR SALE country by prefix or vice versa. Easy "on air" use. Professionally written, menu driven. Only £18.50 inclusive. Send cheque to (state disk size), or further details from Nelson Electronics PO Box 56, Lincoln LN6 8HH. CUSTOM DRAWN CISLs etc to your instructions £12.99. GW3C01 OTHR MORSE PRACTICE IBM PC compatibles. Adjustable wpm/character speed. Abersoch 712675. SAE samples. Random letters/number groups (or mixed). Tests from disk. Key morse from IS YOUR COUNTER ACCURATE? Free check against our 'off the air' keyboard or attach key. Dual Media, Manual. £10. CompRad Limited, PO Box standard' (1Hz at 1000MHz) or buy a new SAJE counter (we check toi P.P.M.) 64. Wokingham RG11 3YY Tel/Fax 0734 733214, SC130 10Hz-1300MHz (typically 1500MHz) £129. SC40 400MHz £105. S230 RADIOSOFT SURVEY (FOR PC). Convert between lat/long, locator. NGR. bench type 10Hz-1300MHz £175. 'Phone for details - see below G3LLL. Calculate beam headings, distances, triangulation (for DF), etc. Local and ICOM & YAESU? Ask our advice, 40 years in the radio trade, good selection UTC clocks. Menu driven, colour, comprehensive setup. £19.95. J.N. Godfrey, new and S.H. - G3LLL see below. Radiosoft, 1 Cheviot Close, Camberley, Surrey GUIS lAZ. (0276) 684267. SHACKLOG3 the PC logging system. Real time OSO logging. DXCC needs REPAIRS most ICOM & Yaesu units serviced, also old valve PA Trio eq alert, OSL labels, rig control, database analysis, reports, import etc. (scopes, videos and lest equipment across the street). Holdings Amateur Simultaneous packet operation. Optional extra on-line IOTA database Electronics (G3LLL), 45 Johnston Street. Blackburn BB2 1EF. (0254) 59595_ (G3KMA). Plus lots more! £27.50 inc comprehensive manual. SASE for full Closed Thurs and hols. details. G3PMFI. 30 West Street, Gt Gransden, SANDY SG19 3AU. 0767 CISLS 1000 £25 SWLS. Logos, Colour cards, Stamps, Patches. - S.A.S.E. for 677913. samples). Currie, 87 Derwent St, Consett, DH8 8LT. "RAYNET" YELLO W REFLECTIVE TABARDS with "RAYNET" like Police, Ambulance. Medium £10.00, Large £10.50. XLarge £11.00. "RAYNET CON- HOLIDAY ACCOMMODATION TROLLER" 50p extra. "RAYNET CONTROL" ROAD SIGN 900mm x 600mm FLYING FROM GATWICK? Stay at Mill Lodge Guest House. 4 minutes from tripod mounted £51.50. Non-reversible Battery Connectors Line/panel airport. Transport available. Telephone (0293) 771170. mounting (10 pairs/pack) £5.50. Mike Watson G8CPH, Ipswich (0473) 831448. NORTH WALES. Elevated site. B&B, caravan, bunkhouse, camping, open all MOSLEY ANTENNAE - All the famous British Manufactured Antennae, year, use of shack. "Tynrhos", Mynytho, Pwllheli, LL53 7PS, (0758) 740712. direct from us including spares/replacements. Mustang. Elan, TA-33Jnr etc. HOLIDAY GITES and B&B IN BRITTANY. Fully fitted self contained gite or Full details shown in our Handbook, price £1.25 refunded upon purchase of B&B in rural Brittany perfect for the family holiday. Information from: Antennae, Mosley Electronics, 196 Norwich Road, New Costessey, Norwich F/G3NCP. Kermoran, 56310 Bubry, France, Tel: 0606 559397. NR55 OEX (Administrative address only). TORQUAY. Quality holiday apartments for couples only. Swimming pool, sun G2DYM CUSTOM BUILT AERIALS trap-dipoles, anti-TVI, anti-interference, terrace, private parking, sea views, quiet location, Rad-Corn reader discount, multiband, baluns, ATUs, traps, parts: Data 36p sae, aerial guide £1. G2DYM. G4N0A. Telephone 0803 607333. Uplowman, Devon EX16 7PH. Phone 03986-215 anytime. FERNDOWN DORSET. 2 bedroomed bungalow in quiet avenue, situated 8 miles from Bournemouth, Poole and New Forest. For details phone 076865091 OSL CARDS. Gloss or tinted cards. SAE for samples to Twrog Press, or 0202 873895. Penybont. Gellilydan. Blaenau, Ffestiniog, Gwynedd LL41 4P. FLORIDA - Clearwater beach area. Luxury villa "waterfront" to Gulf of ALUMINIUM TUBE. Heavy-duty (scaffold) tube approx. dimensions 20' long. Mexico. Private beach, heated pool, golf course. Fish or boat from your floating dock. £350pw. G1GTO. (0502) 732382. 2" dia, 11/64 " (4.5mm) wall thickness. 20' and 10' lengths available @ £1,80 4- VAT per ft. C.W.O. Rusper Hire (Crawley) 0293 87 11321 office hours only. CORNWALL. Luxury caravans. Peaceful farm park. Secluded heated pool. Readers discounts. G4FRJ. 0579 51122. SOLAR/WIND POWER. S.A.E. or two 1st class stamps for catalogue/info EASTBOURNE. Prime seafront family hotel. All rooms en-suite, colour TV. sheets, available from GW4IED, 4 Glanmor Crescent, Newport, Gwent NP9 Tea making facilities. Private car park. 10% discount for Hams. Colour 8AX. brochure - Devonia Hotel, 74 Royal Parade, Eastbourne, Sussex BN22 7A0. 0323 720059. AMIDON/MICROMETALS TOROIDAL CORES, Ferrite, Beads, Rods etc. BOURNEMOUTH 5 minutes town centre and gardens. Room only accommo- Send 50p for catalogue. Ferromagnelics, P.O. Box 577. Mold, Clwyd, N.Wales dation £9 pppn, parking., lounge, tea making facilities. 0202 557631. CH7 1 AH. EIOVISAND, PLYMOUTH: Chalet overlooking Plymouth Sound. Sleeps four. OSL CARDS. Try me for quality and price. SAE for samples. A. W. Bailey Secure private car park. Sell cater. Cafe. Clean beaches. Pleasant walks. (G3YNI). Brean Down Press, 78 Alf red Street, Weston-super-Mare, Avon BS23 GONUO. Telephone 0822 614682 alter 6pm. 1PP.

CALLSIGN MUGS AND PLAQUES personalised with your name. Ideal gift. Low cost. Call 'Characteristics' on 0262 673635 or write 44 Hildethorpe Road. MISCELLANEOUS Bridlington. E. Yorkshire Y015 2BG. COURSE FOR CITY & GUILDS, Radio Amateurs Examination. Pass this OSL CARDS - low cost, quick delivery, superior designs, quality guaranteed, important examination and obtain your licence, with an ARC Home Study personal designs our speciality. L.S.A.E. for samples: The Standfast Press, 5 Course. For details of this and other courses (GCSE, career and professional South Drive. lnskip, Preston PR4 OUT. examinations, etc) write or phone - THE RAPID RESULTS COLLEGE, Dept JT106, Tuition House. London SW19 4DS. Tel: 081-947 7272 (9am-5pm) or use AERIAL WIRES, strong PVC coated £6.50, hard drawn 14swg £14, 16swg our 24hr answerphone service 081-946 1102 quoting JT106. £11.50, all per 50 metres post/VAT paid, 30p stamps for full list of cables, etc - W.1-1. Westlake. Clawton, Holsworthy, Devon. VIDEO TAPE CONVERSIONS to and from all modes N.T.S.C.: S.E.C.A.M.: P.A.L.N.; P.A.L.M. Digital processing. Fast and economical service. Phone PMR RIGS, Handhelds, mobiles. basestations, chargers, nicads. Lowband, G4WMP 0932-846139. highband, UHF, FM. AM. 0435 830888.

R2000NC10; TRIO-JR60; 1-1FlOs; R1155s: CR100s, BC348, AR88. HA350; 640; and many more in stock. Refurbished and all working, new scanners; test PC SCIEN"l'IFIC SOFF WAIZE gear; xtals etc. S.S.B. Products. 0872-862291. (Established 1952). Would you like lo see the best range of low cost technical and scientific public domain and shareware for IBM PC in the UK? SATELLITE! BSB UPGRADES - Available for: Ferguson SRB1: D2MAC t iL RANGE includes: PACKET, FAX, RX/TX control, PCIS design. Circuit and Eprom £10.00, PAL Upgrade £20.00, Service Manual £4.75: Phillips STU902: ANTENNA analysis, 050 logging, CAD ELECTRONIC A NIECII engineering, D2MAC Upgrade £15.00, Service Manual £5.25. PAL/RD/D2MAC Receivers SCIENTIFIC, MATHS R. STATS, MEDICAL, PROGRAMMING. SOURCE always available at bargain prices. Full Spares & Repairs service available. C'ODE, DATA, EDI ICATION, WINDOWS, BUSINESS and lots more. Write, phone or fax torla,i, for our extensive printed catalogue. Send SAE for details. Complete dishes on offer: 60cm £30.00, 80cm: £45.00, The Pablie Domain Software Library, Irinscombe Douse, Beacon Road, Croirborough. 90cm £59.00. LNB's: Refurbished Blue Caps £22.00. New 1.2dB Equivs £32.00. Sussex TN6 IUL. Tel 0892 663298, Fax 0892 667473 Gadget Computer Services. Freepost Dunstable, Bedfordshire, LU5 5UX. Tel: 0582 868687. 9am-11pm.

RSGB AMATEUR RADIO INSURANCE SCHEME G4ZPY PADDLE KEYS INTERNATIONAL

"ALL RISKS" INSURANCE for portable/mobile/base station amateur radio WORLD LEADERS OF HAND BUILT MORSE KEYS and ancillary equipment. A service for RSGB members only. Also public WITH A SELECTION OF 32 FOR YOU TO CHOOSE FRO M liability and equipment insurance for affiliated clubs and societies. Details and Phone your Order or send SASE or 2 IRC's for our Brochure leaflets from Jennifer Lawson. Amateur Radio Insurance Services Ltd, 41 Mill Dam Lane, Burscough, Ormskirk, Lanes L40 7TG Shepheards Hurst, Green Lane, Outwood. Surrey RH1 5QS. Tel: 034-284- arm Phone No. 0704 894299. 4000. Fax: 034-284-4554.

96 RADIO COMMUNICATION June 1993 25 The Strait kill NEW VALVES LINCOLN LN2 1JF Thousands brand new/boxed in stock! J. BIRKETT Tel: (0522) 520767 Supplier% of Electronic Components Available in matched pairs 6JS6/C, 6KO6, 6JB6/A, 6L06, 6HF5, 6146A, 6146B. Yes, the 6JS6/C is Japanese and works line in the FT101. AIR SPACED VARIABLE CAPACITORS with Double Eleanrig 'A" spade each col 75pf @ £4.95. 10091 @ £4.95. 365 • 365 • 3651H @ £4.95. Most amateur radio valves, including those difficult to obtain types, are DUAL SATE MOO PETS BE981 @ 359, X for £1.20, MEM516 'tie 40673w 80p each EX STOCK. Phone or fax for assistance re types suitable for your 12:o 1 9000 QUALITY SLOW MORON CANE g £295. 'A" Flexible Couplers ra, £1.30 each. SURPLUS OIE CAST BOXES approx sizes 92x38x26 (0 £1.30. 120x93x27 £1.95, 120x94x52 @ £2.50 equip ment. Many USA and Jap made versions ol popular bottles SMALL SIGNAL HE PIN DIODES untested 50 la 809 VHF Pin 5 for 75p. UHFjype 5 for 809. available EX STO CK. NUT FIXING FEED TRAUB 500vw. 1000. 500pf, 100091. 470010. All al 859 ea. FOIL TRIMMERS 1091, 22p1, itOpt, w 20p each. 60p1. 1130pf w 254:. IN STOCK NOW. EX.EIXIIPIRENT VALVES. EF91 e 5 tor £1.50, 12AT7 @ 50p, 5246 g £1.30.2E260 £1.00, 12E1 @ £1.50. 513255M @ £1 00. 58264M @ f t 50,6080 30. 3828 @ t I 50. 6A 57G @ £1.30, 2E26 @ £1.00. GZ33 2 C 39 A, 2 C 3 9 B A, 4X1 50 A, 4 C X25 0 B, et, ite £1.30, EF37 50p. EF39 £1.00, EF50 (050p. 4 C X 3 5 0 A & F, 4 C X1 0 0 0 A OSCILLOSCOPE 8ENEAAL PURPOSE 5 to 1011H:240 volt AC Callers only @ £25. EXEOUIPliFift r ROUND METER 50uA ee £3 240 VOLT AC FANS erequipmene £6.75 pair (P&P £2) BASES for above (SK610. 606), plus octal, B7G, BSA. etc. 240 VOLT AC INPUT SUISUN ALARM UNIT vnth 12 volt 5 amp Trenton«. 6.3 volt 1 5 amp Transience, 6 volt Send SAE for list Quotations without obligation' Relay in nice Metal 0300 So £6.50 (POP £4). NULLARD TRANSISTORS 0C171 w 95p. 4 tor £3.40, AFZ12 r £1. 61110378A co 509. AF239 ft. PHONE 0484 654650/420774 FAX 0484 655699 RE. POWER TRARSISTORS P19788 2 to MAIM' 20«att 598 W. £12 95 pair. SLYEST w £3. BFR64 w Cl YERTA DUGS 1 2 Volt Stack el Five (6 Volt) 2500K g 75p. WILSON VALVES 28 Banks Avenue, Golcar, R.F. POWER TRANSISTORS PT31991. No details w £295 Access. Switch and Barclay cards accepted P&P 609 under £5 Over tree, unless otherwise stated Prop Jim Fish G4MH . Huddersfield, Yorks. HD7 4LZ HOwES KITS Ava,lable by post and for callers

KANGA's QRP KITS Made by Alphalab, Salt Lake City, U.S.A. How about building a kit? A RECEIVER, TRANSMITTER or perhaps a piece of Check radiation from power supplies, linear TEST EQUIPMENT. Many of our kits are from the G-ORP club too. amplifiers, transmission lines, nearby antennas, Many aro ideal for the beginner to construction. handheld radios, VDUs. TV sets, etc. Send an SAE for our FREE catalogue to: IDEAL FOR RADIO CLUBS P11011111-TS For information or to order write to: Seavien House. Crete Road East, Folkestone Cr8 TF.G 25 Beaufort Drive, KIrkIntIlloch, Tel/Fas 0303 891106 flem's ROLLO ELECTRONICS Glasgow, 066 1AX

IM M FOR SALE: 4CX250B £19. VAT. 4CX350A £27WAT. EIMAC and STC rotutb,shoo and fully KEN WOOD VISA YUPITERU YAESU ICOM tested lex-equipmentl. 60 day guarantee, discount on 10 or more ALINCO G3RCQ MAIL ORDER FOR SALE: Sockets for 4CO25013 by AEI UK, ex-equipment but working and clean at £17 Essex Amateur Radio Services Limited each. discounts for larger quantities Ceramic circular chimney for same at £8 each. We buy, sell new & used amateur radios. Daytime phone Alan 0268 553252. WANTED FOR STOCK: KT66, KT77, (T88, PX4. PX25 valve collections, klystrons. magnetrons. transistors. Please post us list o! what you have. Quick replies, cash walling EvetWiEnd Dave G3RCO 0708374043. Send SAE. For list lo G3RC O, 9 Troopers Drive, Harold Hill, Romford, Essex RIM 9DE. BILLINGTON EXPORT LTD PLEASE NOTE OUR NEW ADDRESS: Unil 1E. Glimens industrial Estate, Remember we are a small business offering a personal service BillIngshunel, Sussex RH14 9EY Tel (6403) 784961. Fax: 10403) 783519 We will also sell your gear on com mission 10% Ask, please! Callers by appointment only Minimum order £50 • VAT (UK/export)

AVAILABLE IN EUROPE VISA AMDAT from EASTERN New & Used Amateur Radio Equipment + Accessories COMMUNICATIONS Call at our shop or ring for latest details on our fast moving stock CAVENDISH HOUSE HAPPISBURGH CASH PAID FOR USED AMATEUR RADIO EQUIPMENT NORFOLK Send SAE for latest stock list + catalogue 0692-650077 4 Northville Road, Northville, Bristol, BS7 ORG 0272 699352

THE AMATEUR RADIO SHOP LOW COST SCREEN PRINTING Authorised dealers for Kenwood. Yaesu, We print from your artwork, or we can produce artwork for you * FRONT PANELS * DIALS * LABELS Alinco, J. Beam, etc SHACK * INSTRUMENT CASES * COMPONENT IDENT CLOCK SPECIAL THE G4MH MINI BEAM 20.15.10m * PLASTIC/ACRYLIC SHEET * PLAQUES ;um 'ace,. 'ONE•CIFF Sae for details NO MINIMUM ORDER e ponied SERVICE TO Also * Tee shirts * Badges * Ties * Sweatshirts tair and name CONSTRUCTORS Selection of secondhand equip ment 029.96 ic del * Car slickers * Signs * Banners AT LOW COST 2/4 CROSS CHURCH STREET, HUDDERSFIELD STOP PRESS PROMOTIONS (GeGQL) Tel 081-553 5211 Fix. 081 553 5690 WEST YORKS 1101 2PT Tel: 0484 420774 Callers t 125 Woodlands Road, Ilford Essex IGI IJP

WISE BUY 'ee BARGAINS! WIDEBAND SCANNER ANTENNAS & AMPLIFIERS "REVCONE" DIscone premium quality VHFAJlif. S0239 connector f.37.75, N- ALL PRICES INCLUDE P&P • VA T type £39.80. New "REVCONE PLUS" with improved low frequency coverage PYE M294 "A" Hand or 2m 6ch with mic etc £75 £48.95. "RAOAC" nest of dipoles, receives 25-1300MHz, plus transmit on 2m and PYE MX294 "A" band synthesised with mic etc £100 either 4m or 6m: £59.95. Special VHF/UHF Airband RADAC: 108-136MHz & 220. PYE MF5FM "A" hand for 2m 3ch with mic and circuit £29 400MHz: £69.95. GA-4 SERIES PREAMPLIFIERS 20MHz-1GHz precision PYE MF5U "U" band for 70cms with mic £36 NOLTON NOVA 242 small lOch mobiles for 4m arrtam . Into £26 stripline construction for exceptional stability: 13dB gain at 1GHz with filter to RACAL MA685 30-76 MHz wire dipole kits with 4 antenna elements in satchel reduce HF breakthrough problems. GA-4M Iniine Masthead Amplifier COMPLETE 50w power handling BNC connector, unuSed, believed for PRM4160 £12 with stripline DC supply splitter unit, requires 12v DC at 30mA, N connectors MILITARY WRISTWATCHES by MWC Mechanical, unissued • strap £42 PL/S0 connectors: £18.50. "Local use" versions, small die-cast box DYMAR 2000 mobile radios synthesised, 100ch 15w r/I o/p, supplied with mod package, for 12v DC operation. GA-4B (BNC sockets): £35.75. GA-4S (S0239): info, ciproms, components etc. To make useful 2m radio £80 £5.75. GA-4N (N sockets): £39.85. MOTOROLA PSU mains in 130VA 13.6V out £35 PYE W15FM "A" band 25khz, ch sep, 6ch wilh gear, boot mount £26 Mains adaptor for use with any of above preamps: £8.95. BURN DEPT 8E600 UHF h/held. 6ch. with used ball 11 ant £30 Write, phone or fax for lists. Regular lines, components and bargains for callers. RACAL MA4161AT NiCad packs cOntaining 9xSub -C" Cells. 2 for £16 Open 10am-5pm Mon-Fri (occasional Sots) We now accept ACCESS/VISA orders on the telephone. SAE for mail-hot Or enquiries please. Ex PMR radios are sold "as-is" but are checked for In All Prices Include UK Carriage& VAT at 17.5% completeness before despatch. GAREX ELECTRONICS MVISA M STATION YAR D, SOUTH BRENT, G.W.M. RADIO LTD ' SOUTH DEVON, TO10 9AL e mu 40/42 PORTLAN D ROA D, WORTHIN G, SUSSEX BN11 1C/N ki5x Phone: (0364) 72770 Fax: (0364) 72007 TELEPH ONE: 0903 234897 FAX: 0903 239050

RADIO CO M M U NICATION June 1993 97 ADVERTISERS SERVICE MANUALS INDEX Available for Most Equipment AA & A Ltd 77 Key Solar Systems 92 TV, Video, Military, Amateur, Test etc Aerial Techniques 92 Klingenfuss Publications 78 Any Age, Make or Model. AKD 57 Lowe Electronics Ltd Write or Phone for Quotation. Amateur Radio Comms Ltd 10, 11 & IFC MAUR I TRON ( RC ) 70 McKnight Fordahl Ltd ... 84

Access 8 Cherry Tree Road, Chinnor, Amateur Radio Insurance Martin Lynch G4HKS VISA Oxon, OX9 40Y. Services 78 48, 49 & 71 Amateur Radio Shop, The Mauritron Technical Services Tel: (0844) 351694 Fax: (0844) 352554 97 98 AMDAT 80, 97 Methodical Engineers Ltd TEST EQUIPMENT MAINTENANCE ARE Communications ... 38 87 AND TECHNICAL CONSULTANCY Ascom Telecommunications Mutek Limited 98 U Service manuals 11 We support scientific, Ltd 71 Nevada Communications ... o Spare parts commercial and industrial 14, 15 ['Co mprehensive repair equipment manufactured Besprint Services 92 service including by over 100 different Billington Export Ltd 97 Public Domain Software complete instrument companies refurbishment at highly El New and second-hand J. Birkett 97 Library 96 competitive rates for radio test equipment also amateurs available at competitive Bredhurst Electronics Ltd PW Publishing Ltd 77 Duinbutors for: prices 80 Quartslab Marketing Ltd 92 WAUGH INSTRUMENTS o Components, valves and RAMTEST LTD miscellaneous items Cambridge Kits 98 R.A.S. (Nottingham) 63 KRENZ ELECTRONICS Comar Electronics 84 R&D Electronics 90 Hesing Technology Datong Electronics Ltd 72 Radio Hamstores 9 Cromwell Chambers, 8 St. John's Street, Huntingdon, Combs PEN 6DD Tel: 0480 433156 Fax: 0480 413357 Dee Comm Amat Radio Remote Imaging Group 98 Products 90 Peter Rodmell Communica- Eastern Communications tions 78

TEL: (0934) 512757, (0850) 707257 77, 97 Rollo Electronics 97 G4TJB QSL CARDS FAX: (0934) 512757 S.E.M. 72 QSL CARDS printed to your specification including photocards and cartoons. Essex Amateur Radio Services Send SA. E. for samples and full product list. We can supply all makes of Amateur Ltd 97 Siskin Electronics Ltd 70 radio equipment, Transceivers, Receivers, P.S.U., A T U, Meters, Packet. Antennas, Cable. Plugs, Computer discs, Plus much more phone us with your G4TJB QSL Cards 98 South Midlands Comms Ltd requirements. Part exchange welcome. G4ZPY Paddle Keys 96 22, 23 & OBC en UNIT 6, WORLE INDUSTRIAL CENTRE, COKER ROAD, °MT WORLE, WESTON-SUPER-MARE, 8S22 08X. Garex Electronics 97 Specialist Antenna Systems G.C.H.Q. 83 Ltd 84 Grosvenor Software (G4BMK) Spectrum Communications THE INTERNATIONAL GROUP FOR APT, HRPT, ETC. INNOVATIONS, CONSTRUCTION, HARD WARE, SOFTWARE 63 90 RE M OTE For All G.W.M, Radio Ltd 97 S.R.P. Trading 72 IM A GIN G W EATHER SATELLITE Enthusiasts Halcyon Electronics 80 S.R.W. Communications Ltd G R O U PI03 For a Free Information Pair ald Membership detads send a jggoedijnerigets_ large Sf4f (0 the Membership Smeary, Ray Godden, Rig-Sub, Ham Radio '93 83 69 PUBLIS HE D Q UARTERLY P.O. Box 142, Ridnesx.orth, Hertfordshire, W03 4RQ, Wand Harlingwood Ltd 92 Stop Press Promotions Hateley Antenna Technology (G4GQL) 97 87 Suredata 87 mulek limited 0602 729467 Heatherlite Microphones 70 Technology Partnership Ltd, Hesing Technology 92, 98 The 83 a Specialists for low noise amplifiers and frequency transverters Unique suppliers of replacement front ends for Yaesu loom and Trio ICOM (UK) Ltd IBC Teepee Technical Services * Also power amplifiers power supplies band pass filters sequencers Write for free catalogue of lull product range to: ICS Electronics Ltd 64 90 PO Box 24, Long Eaton, Nottingham, NG10 4NO Kanga Products 97 Tennamast Scotland 21 R.A. Kent (Engineers) Ltd Albert Thurston 80 90 Waters & Stanton 30 & 61 ANTENNA NOISE BRIDGE Kenwood 25, 27 Wilson Valves 97 LOSING DX? Find faults FAST, measure RESONANCE 1 .160MHz and RADIATION RESISTANCE 2-1000 ohms -- without transmitting, also use it for verticals and loops, fumto-build kit includes ALL parts, case, pcb, UK postage etc only £27.90, or 40% OFF with a tunable audio NEXT COPY DATE notch filter kit, send only £38.90 for both The display advertise ment copy date for our CAMBRIDGE KITS August 1993 issue will be 11th June 1993 45 (RH Old School Lane, Milton, Cambridge

98 RADIO COM MUNICATION June 1993 NOW LISTEN HERE IC-R1 This amazing handheld receiver gives wideband coverage from 100KHz to 1300MHz in one of the smallest packages ever available. Features include: 100 memory channels, AM. FM and wide-FM coverage, advanced scan functions, 10 frequency ranges for program med scan, auto- memory write scan, direct The IC-R100 is a most compact receiver enabling easy keypad entry, 24 hour Installation into any vehicle. Coverage is from 100kHz to clock/timer, auto power- 1.8GHz with features that include: 121 me mory channels, save and auto power OFF. memory scan, priority scan, selected mode memory scan, " built-in Nicads. Find out auto-me mory write scan, me mory skip, 10 program med how ICOM get so much scan ranges, clock with timer function. 15dB preamp. AFC into such a tiny radio. and optional AC adaptor. Ideal for people on the move..

:1". • • • The IC-R72 is a superb HF recélvergiving you world-wide listening possibilities. It is simple to operate and gives continuous coverage from 30kHz to 30MHz. Features include: advanced DDS system. 100dB of dynamic range, 24 hour system clock with timer functions, preamp and attenuator, noise-blanker, 99 memory channels plus 2 scan edge channels Optional CW narrow filters, a high-stability crystal and FM unit are also available.

Stay on top of the world with the latest VHF and UHF high-sensitivity com munications technology found in ICOM's all-mode IC-R7100. Features include: advanced window scan, program med memory, selected mode memory, selected number me mory plus auto me mory write scans and 24-hour clock with built-in ON/OFF timer. Continuous coverage is from 25MHz to 2GHz with 900 memory channels for SSB, AM FM and wide-FM storage. IC-R9000 Bottom of the page but top of the class when it comes to capability. As the world's ultimate receiver, the 1C-R9000 enables you to broaden your horizons and give you the edge over any opposition. A feature short-list includes: wide-band coverage from 30kHz to 2GHz, 5' CRT display, spectrum scope, memory editing. 1000 memory channels, TV video signal Rx. DDS, IF shift, notch filter , noise blanker and CI-V computer control.

N.B. Photographs are not to scale ICOM manufacture a full range of base-stations, mobiles and handheld transceivers and receivers to cover all popular Ham frequencies and beyond. No matter what your requirement ICOM have the radio for you. For more information and the location of your local lcorn dealer contact: 'corn (UK) Ltd. Sea Street Herne Bay Kent CT6 8LD 100M Telephone: 0227 741741 (24hr). Fax: 0227 741742 Same Again ir? In the battle of the stat , F ver is the clear winner. Rased on the same remarkable performance, ease of operation and the features of the FT-1000. The FT-990 is an extraordinary achievement, compare the advantages yourself. Feel the silky smooth tuning, hear the dual digital SCF (Switch Capacitance Filter) provide unsurpassed reception quality never before obtained. Be heard with the CPU controlled RF FSP (RF Frequency-Shifted Speech Processor) for the extra pile-up "PUNCH." See the lightweight cop and compact FT-990 with built-in AC switching power supply. The FT-990 is a true champion HF rig without compromise. Leave it only to Yaesu to offer powerhouse

COD performance that leaves the rest far behind.

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FT-990 HF All-Mode Transceiver

Dual VFOs With Direct Digital Adjustable RF Power Output: int Panel RX Antenna Selection: Synthesis IDOSI: With internal heatsink and Bows quick switching. Two ten-bit DOS plus three eight-bit whisper•quiet temperature switched DOS. squirrel cage blower. Digital Voice Sturage (DVS-2): Option provides instant playback of High Dynamic Range: Adjustable Level Noise Blanker: I6-second receive memory, plus two 108dB. RF circuit design with quad For a wide variety of noises and ti-second or 4-second "CQ contest" Fr-.--r first mixer similar to the FT- woodpecker. messages on transmit. I0(X) as only Yaesti's unsurpassed tradition can provide. CPU Controlled RF FSP (RE Built in Switching AC Power Frequency Shifted Speech Supply: (2W 500Hz Crystal Filter Processor): Reliable performance with (Included). For better intelligibility and pile-up significantly reduced size and weight. "PUNCH - for competitive Dual Digital SCF Filler and IF situations Band Stacking VEO) System: Shift. IF Notch: Each VEO register memorises your Superior interference reduction. High Speed Automatic Antenna most recent operating frequency. Tuner: mode, bandwidth and clarifier Automatic Mode- Dependant AGC With W memories. information for instant return to your Selection. favourite frequency and mode. .'•0 Memories: Full and Semi-Break In CW Wept:Infant Aru and modeilF filter Accessories/Options: Operation: memory. TCX0-2 (Tempe/mute Compensated With built-in iambic memory keyer Crystal Oscalaux), XF-10.9M-X)2-0I with BFO offset and CW spot. Key Monti-node Selection on (2nd IFSSB Nanow 2.0kHz), XF-445C- jacks on both front and rear mute's. PacketfRTTY: 251-01 (3rilIFCW Narrow 2501-14SP-6 Switchable FSK unte. R1 - (External Speaker), MD-1030e*

J innes). Performance without compromise