( Volume 66 No 10. Price: £3.50 Radio Communication

The Journal of the Radio Society of Great Britain

October 1990 Serving Amateur Radio

Leicester Show Guide

cK.

HF National Field Day Report — page 10 KEN WOOD

The Pocket Performer The TH-27E and TH-47E are unique handheld VHF/UHF • Convenient Multi-Function Scanning System transceivers that offer compact size, multiple functions, easy • Selectable RF Power Output with Economy Low Position operation, and a unique ergonomic design. These are truly •I Full-Size Handheld Radio features in a Compact High-Impact the handheld transceivers of the future. Moulded Case •I DC Direct-in with Recharge Function • 5W RF Output with External 12V or 2.5W with Built-in 7.2V 1. 40 Multi-Function Memory Channels plus a Call Channel 700 mAh Ni-Cd battery B Compact Easy-To-Operate Multi- llows Odd Splits in all Channels MI Lamp Lock Key Function Keyboard • Remote Control Speaker Microphone U Optional TSU-7 Tone Unit (sub-audible tone) Option • Dual Tone Squelch System (DTSS) • Pager Function • Ultra-Compact and Lightweight • Built-in Clock

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LOWE ELECTRONICS LTD. Chesterfield Road, Matlock, Derbyshire DE4 5LE Telephone 0629 580800 (4 lines) Sole Appointed UK Distributor for KEN WOOD Amateur Radio Managing Editor Mike Dennison. G3XDV

Assistant Editor Marcia Brimson

Production Editor Sid Clark Radio Communication

News Editor Volume 66 No 10 Tim Charles, O4EZA

Draughts/rum October 1990 The Journal of the Radio Society of Great Britain Derek Cole

Editorial Secretary Louise Hill

4 SOCIETY PAGES • Council Brief • Do you have a Query?

6 NEWS AND REPORTS e Young Amateur of the Year 1990 • VHF Convention • Novice Column e Young Man of the Year • RA Report • Personal Loans for Members • RLO Nominations 1991-93 • Stolen Equipment • IEE Conference • All contributions and correspondence concerning the content of Radio Datacomms Column • World Radiosport Team Championships • RSGB Communication should be posted to: meets Kitmakers

The Editor Radio Com munication 10 NFD 1990 REPORT Lambda House, Cranbome Road Chris Burbanks. G3SJJ reports on this year's Field Day activities Potters Bar, Nerfs EN6 3JE

Tel (Editorial only): 0707 59260 17 SPECTRUM ANALYSIS Fax (Editorial only): 0707 49503 • HF E-mall (Telecom Gold): 76:MSX020 • HF PROPAGATION PREDICTIONS N.B. for all other RSGB telephone • VHF/UHF numbers see page four. Cover picture: e SWL 1st Bilston Scouts at 1989 Jamboree on the Alr. See page 74 for 1990 JOTA list. 28 TECHNICAL TOPICS Editorial Board Basically a technical hobby? • KN5S's low-drive. high power linear • Healer David Evans. G3OUF voltage regulation • Acid spills can be costly • The Bi-Square Array Publisher/Secrelary reappears • is it really Ancient Modulation • Solar Fiares - problems to come? e Radio under pressure • Here and there Peler Chadwick, G3R2P Chairman. Technical and Publications Advisory Committee 38 A WIDEBAND MONITOR RECEIVER FOR TOP BAND TO TWO METRES

Mike Dennison, G3XDV A novel monitor receiver by Ian Braithwaite, G4COL Managing Editor 41 A SIMPLE 70/144MHZ DIPLEXER Two bands with one antenna with this easy 'weekend project'. Dr LC Waring, ADVERTISI NG GI3WUO. shows you how All display and classified advertising enquiries (excepting Members' Ads) should be 46 AVOIDING WIND VIBRATION DAMAGE TO AERIALS directed to our advertisement Make sure your antenna stays in one piece this winter by referring to this agents: useful article, by Arthur Bolton, GM3BMI Victor Brand Associates Ltd., 'West Barn', Low Common, Bunwell, 49 BOOK REVIEW Norwich, Norfolk RN16 1SY. Construction: Tel: 095 389 8473 G4COL's Wide Band Monitor Receiver Guide fo Broadcasting Stations, 1989-90. Reviewed by Bob Treacher, Fax: 095 389 8437 — Page 38 RS32525

Radio Communication Is published 52 COLUMNS by the Radio Society of Great Britain e ORP as its official journal on the first day • SATELLITES of the relevant month and is sent tree and post paid to all members of • EMC the Society. Each edition is valued • MICRO WAVES at £.50. • SWL Closing date for contributions, unless otherwise notified. Is five weeks prior 62 CONTEST NEWS to publication dale

70 MEMBERS' ADS Radio Society of Great Britain 1990 73 EVENTS DIARY

Filmset by JJ Typographics Ltd, Unit 4. Baron Court, Chandlers 75 THE LAST WORD Way, Temple Farm Industrial Estate. Southend-on-Sea. Essex SS2 SSE. 78 RSGB MAIL ORDER PRICE LIST

Printed by Mayhew McCrimmon Printers Ltd. Units 1.4 Star Lane 81 INDEX TO ADVERTISERS industrial Estate, Great wakering, Essex. 553 OPJ. Supplement: PULL OUT SECTION Leicester Show Guide — pages 1-xx Free - Leicester Show Supplement RSGB membership at 30 Juno 1990: 35,225

RADIO COM MUNICATION October 1990 3 • It was reported that the new AS400 computer was running Council satisfactorily. The new integrated RADIO SOCIETY OF software was not expected to be GREAT BRITAIN Brief fully operational for some time.

• Council discussed the fact that THE NATIONAL SOCIETY WHICH REPRESENTS UK RADIO AMATEURS many of the services provided by Founded 1913 Incorporated 1926 umeee by guatabtep 19 May 1990 Member society ol the treernabortat Amateur Radio linon the Society were provided to specific groups of members from PATRON: HRH PRINCE PHILIP. DUKE OF EDINBURGH. KG • Mike Dennison, G3XDV, was the general fund. Council felt that appointed Managing Editor of in view of the present economic Membership is open to all those with an active interest in radio Radio Communication. The situation the time was now right to experimentation and com munication as a hobby. Applications for RSGB Secretary was appointed investigate a fairer method membership should be made to the Membership Services Department horn which lull details of Society services may also be obtained. publisher on behalf of Council and whereby those members who Marcia Brimson was appointed used specific services should pay Headquarters and registered office for them. At the sanie time, Lambda House, Cranborne Road, Potters Bar, Herts EN6 3JE Assistant Editor. Mr. Dennison's Telex 9312 130923 (RSGB) appointment would leave a Council agreed that the high staff Electronic mail via DialcomiTelecom Gold. 87:C00083 vacancy in the Secretary's office loading needed to be reduced. It Fax: 0707 45105 which would be very difficult to fill. was agreed that as much Telephone: 0707 49855 — Members Hotline and book orders correspondence as possible 0707 49805 — Subscriptions queries • Council discussed the Society's would now be diverted to Council 0707 59260 — Radio Communication only plans for its 1991 National members, Committee Chairmen Secretary and Chief Executive: David Evans. MSAE. CPL. G30U1- Convention and asked the and Honorary Officers and RLO's. Chairman of the Exhibitions and COUNCIL OF THE SOCIETY Rallies Committee, Norman PRESIDENT: Frank Hall, GM8BZX Miller, G3MVV, to provide advice • Council appointed a Financial EXECUTIVE VICE PRESIDENT: John Case. GW4H WR for the next meeting. It was Controller to act as a financial IMMEDIATE PAST-PRESIDENT: agreed that an annual event was consultant to the Society until the Julian Gannaway, G3YGF needed at which to show the work end of 1990. The Secretary was HONORARY TREASURER: W J McClintock. G3VPK being undertaken by the Society. directed to become temporarily Council also agreed that the involved with day-to-day business Society would attend the London matters, and to reduce the priority ORDINARY MEMBERS OF COUNCIL Amateur Radio Show at Picketts normally given to amateur radio E J Allaway, MB. ChB, MRCS. LRCP G3FKM Lock in 1991. matters in order to revise J Bazley, G3HCT administration procedures to G L Benbow. Msc. CEng MIEE. G3HB • The Secretary was thanked for compliment the work of the Mrs M H Claytonsmith G4JKS his generosity in staffing and Financial Controller. G R Jessop CEng. MIEE. G6JP supplying an RSGB stand at the T I Lundegard, G3GJW Dayton, Ohio, Hamvention. A McKenzie, MBE CEng, FIEE. FAES G3OSS Council member John Bazley had • Angus McKenzie, G3OSS, said F SG Rose. G2DRT also attended the Show at his that it had originally taken him own cost and considered the nine months to become RSGB attendance to be first rate acquainted with Council matters. ZONAL MEMBERS OF COUNCIL and worthwhile. Zone A G R Smith. BSc. MISTC, MBIM, G4AJJ After much discussion he agreed to prepare a paper for Council on Zone B J Allen. G3DOT • A major review of the work of Zone C J Greenwelt. AMIEE. G3AEZ Council members qualifications. the RSGB Committees and Zone D P E Chadwick. G3RZP Zone E E J Case. GW4HWR Honorary officers had been Zone F J T Barnes. GI3USS undertaken by a special • In view of continuing abuse of Zone G I D SuMt, GM4AUP President's Advisory Group. A the packet network, it was series of recommendations and decided to send draft guidelines thanks would be communicated for packet users to the HONORARY OFFICERS to all of the Honorary Officers and Radiocommunications Agency Audio visual library co-ordinator David Simmonds, G3JKB Committees involved, which sought comment, Observation service co-ordinetor: Geoff Griffiths, G3STG HF Awards manager: S Emlyn-Jones. GW4BKG • Council discussed the common VHF Awards manager Ian L Cornes, G4OUT renewal date and decided to put • On advice from the Morse Test Chief morse test examiner. A N lanson, G3GDO this matter into abeyance for the HF manager E J Allaway, G3FKM Steering Group, Morse time being. This was so that other Microwave manager C W Suckling. G3WDG Examiners were re-appointed for aspects of the Society's financial Trophies manager: Mrs M H Claytonsmith. G4JKS a further year as from 1 July work could be given higher VHF manager D Butler, G4ASR 1990. Society historian: G R Jessop, G6JP priority in the short term. Intruder Watch (IARUMS): Martin Atherton. G3ZAY • Dave Lawley, G4BUO, was Morse practice co-ordinator Mike Thayne, G3GMS • It was reported that the new appointed Chairman of the HF Correspondence to honorary officers should be Amateur Radio Observation Contests Committee. Ron addressed directly ro them (QTHR), nor ro RSGB HQ Service Co-ordinator. Geoff Glashier. G6LX, was to be Griffiths. G3STG, had met with thanked for his dedication as the the Head of the Radio ANNUAL SUBSCRIPTION RATES previous Chairman. Once-off joining fee: £1.50 Investigation Service. Corporate members: UK and oversees (Radio Communication by • The fee for the 1989/90 Audit, accelerated surface post): £25.00 to be carried out by the new UK associate member under 18: £8.50. Family member £9.95 Auditors, was agreed by Council. • Other matters discussed UK students over 18 and under 25: £12.75 (Applications should give included: the RSGB Green Book, applicant's age at last renewal date and include evidence of student status) • While Council appreciated the Book Production, Raynet matters, Affiliated club or society/regletered group (UK): £25.00 (including Radio difficulties which had been RSGB attendance at external Communication): £14.95 (excluding Radio Communication) (Subscriptions experienced with the 1989/90 events, the retirement of Mr & include VAT where applicable) budget, the Secretary stressed Mrs Allen and methods of Membership application forms available from RSGB HO the need for a proper budget for informing members who to 1990/91 as a basis for sound contact to get the best out of the financial control by F&S. Society.

4 RADIO COMMUNICATION October 1990 Do You Have a Query?

• General advice and • Propagation Studies details on local clubs, Who do you contact for an answer? In most cases there is no need to Committee: or don't know who to consult anyone, as 90% of the answers to your questions are to be found in the 130 page Information Directory which forms part of the Chairman - Geoff Grayer. G3NAO, contact:- 1990 RSGB Call Book "Bagatelle, 3 Southend, Your RSGB Liaison Officer. See the Brightwalton, Newbury, Berks, Ca Book May RadCom page 59 However, if you feel a letter is the only way to get a definitive answer, RG16 OBE. Home: 0235-4-46511 or your membership card (if recently are you writing to the best person? To ensure an improved response, renewed). we suggest you contact one of the following:- • QSL Bureau: Outgoing cards - RSGB. PO Box • RSGB Policy Matters • Band Plans and e Licensing: 1773, Potters Bar, Herts. EN6 3EP (Zonal Council operating practices: Incoming cards - your QSL sub- member):- RSGB Policy - John Bazley, See the Call-book or Feb 90 G3HCT, "Brooklands", Ullenhall, manager (see p44 June RadCom) RadCom for latest bandplans. For Solihull. Warwickshire, B95 5NW Zone A (North of policy, contact the appropriate Government policy/licence • Raynet: England): spectrum committee chairmen: conditions and interpretations - Group Information - Mike Barker, Geoff Smith, G4AJJ, "Greenacres", Amateur Radio Section. Room 613, HF - Martin Atherton. G3ZAY. 41 G8CAC. Sawdon. Scarborough. North Yorks, Enniskillen Road, Cambridge, CB4 Radiocommunications Agency, Y013 9DY. 1SQ Waterloo Bridge House, Waterloo Zonal Co-ordinator & Talk-through Road, London, SE1 8UA. Tel: 071 permits - Ian Jackson, G8RWH. VHF - Peter Burden, G3UBX, 18 215 2316. Zone B (Midlands): Langley Road, Merry Hill, Emergency Planning & Vice Wolverhampton, WV3 7LH. Renewals and payments - Radio Chairman - John Witt s, G6BBW. John Allen. G3DOT, 4 Philip Amateur Licensing Unit. Post Office Avenue, Waltham, S.Humberside, Microwave - Mike Dixon, G3PFR, Press Officer - Ronald Cowan, Counters Ltd, Chetwynd House, DN37 00D. Tel: 0472-825899. Woodstock, Gazebank, Norley, GM4SRL. Chesterfield, Derbyshire. S49 1PF. Warrington, WA6 8LL. Tel: 0246 217555/217699. Public Relations - Trevor Emery, Zone C (SE England and G3KWU. East Anglia): e Beacons: Chairman - Philip Howarth, G3YAC, • Membership Liaison: 1 Clay Close Lane. Impington. John Greenwell, G3AEZ. HF - Alan Taylor, G3DME. QTHR. Committee Chairman - Geoff Smith, Cambridge. CB4 4NE. "Eastfield", Henfold Lane, Beare VHF - John Wilson. G3UUT, G4AJJ (see above). Green, Dorking, Surrey. RH5 4RW. QTHR, Tel: 0306-77236. • Repeaters: Microwave • Graham Murchie. • Morse Practice All repeater enquiries should be G4FSG, QTHR. Zone D (SW England): Transmissions referred to the Repeater Zonal Co- (GB2CW): ordinator in which the repeater is Peter Chadwick, G3RZP. "Three • RSGB Contests: sited, as follows:- Oaks". Braydon, Swindon, Wilts, Co-ordinator - Mike Thayne, First contact the contest adjudicator SN5 OAD. Home: 0666-860423. G3GMS, 14 Tynedale Avenue, North of England - Phil Coates, (see the contest rules). For policy, Monkseaton, Whitley Bar, Tyne & GOCOA. Tel: 0924 848803. contact the respective Committee Wear, NE26 3BA. Home: 091 252 Midlands - Alan Marwood, G8SSL, Zone E (Wales): Chairman: 6138. Tel: 0602 202562. John Case, GW4HWR, 2 Abbey HF Contest Committee - Dave SE England and E Anglia - Mike Close, Tyrhiw Taffswell. Mid Glam, Lawley, G4BUO, QTHR. CF4 7RS. Tel: 0222-810368. • Novice licence: Hastings, G8ASI. Tel: 0923 265734. VHF Contest Committee - Bryn John Case, GW4HWR (see above) SW England - Fergus McGilp, Llewellyn, G4DEZ, 110 South G8URB. Zone F (Northern Avenue. Southend-on-Sea. Essex, Ireland): SS2 4HU. Home: 0702-460747. • Packet Radio: Wales - Dave Brown, GW4NQJ. Tel: 0686 640814_ Terry Barnes, GI3USS, 95 Direction Finding Committee - Brian Mailboxes - Neil Lasher, G6HIU, 40 Crawfordsburn Road, Bangor. Co Bristow, G4KBB, QTHR. N Ireland - Dr David Hutchinson, farm Road, Edgware., Middx. HA8 Down BT19 1BJ. Home: 0247- 9LT GI4FUM, Tel: 0849 464672. 473948. • EMC: Scotland - Colin Dalziel, GMBLI3C, Nodes - Dave Hough. G4WRW, 1 Advice on solving breakthrough and Foxe Rd, Frampton. Cotterell, Tel: 0698 281847. Zone G (Scotland): other electromagnetic compatibility Bristol, BS17 2AE. Special Projects - Dave McQue. matters: G4NJU, Tel: 0908 378277. Ian Suet. GM4AUP. 37 Meldrum General enquiries - Ian Suait, Mains, Glenmavis. Airdrie. EMC Coordinator (see Dec 89 and GM4AUP. 37 Meldrum Mains. TV Repeaters - Graham Shirville, Lanarkshire., ML6 00G. Home: June 90 RadComs) Glenmavis, Airdrie, Lanarkshire., G3VZV. Tel: 0525 290343. 0236-65937. ML6 00G. Home: 0236 65937. Committee Chairman: Bob Peace, Chairman - Geoff Dover, G4AFJ, 31 G8SOZ. Newbold Rd, Kirkby Mallory. Leics, • Awards: National helpline: 0537-593449. • Planning LE9 70G. Tel: 0455 823344. For contest award winners, please Need for permission and how to refer to the appropriate contest • Spectrum abuse: • Exhibition & Rally apply - booklet free to members committee. Committee: from Membership Services at RSGB Amateur Radio Observation Service For other awards, enquiries and HQ. Co-ordinator • Geoff Griffiths, Organises trade shows at NEC, applications go to either: G3STG, 11 The Grove, Asfordby, VHF Convention and Woburn Rally. Planning application refused - Melton Mowbray, Leics, LE14 3UF. HF Awards Manager - Steve Emlyn- RSGB Planning Panel, via RSGB Chairman: Norman Miller, G3MVV. Jones. GW4BKG, P 0 Box 20. HO. "Avon". Gardiners Lane, Crays Hill, Bridgend, Mid Glamorgan. CF35 • Technical queries: Billericay, Essex, CM11 2XA. Peter Chadwick, G3RZP. "Three IOTA (Islands on the Air) Awards • Project YEAR: Oaks". Braydon, Swindon, Wilts. Manager • Roger Balister, G3KMA. • Intruder Watch: La Quinta, Mimbridge, Chobham, Encouraging youngsters into SN5 OAD. Home: 0666-860423. Woking, Surrey, GU24 8AR. Non-amateur service operation in amateur radio. exclusive amateur radio bands. • Trophies: VHF and Microwave Awards Co-ordinator • Hilary Claytonsmith, Manager • Ian Cornes, G4OUT, 6 Acting Co-ordinator - Martin G4JKS, 115 Marshalswick Lane, St Mrs Hilary Claytonsmith, G4JKS. Haywood Heights. Little Haywood. Atherton. G3ZAY. 41 Enniskillen Albans, Herts, ALt 4UU. Tel: 0727 115 Marshalswick Lane, St Albans. Stafford, ST18 OUR Road, Cambridge, CB4 1S0 59318. Herts, AL1 4UU. Tel: 0727-59318.

RADIO COMMUNICATION October 1990 5 EWS Young Amateur REPORTS of the Year 1990

JUST AS WE WENT to press, the amateur radio, combining an Young Man of Radiocommunications Agency interest in construction and the Year announced the winners of this operating with helping others. In year's Young Amateur of the Year particular, they have both worked 1989 YOUNG AMATEUR of the competition. hard at passing on their interest in Year, Ted Walker, GOKAO, First prize and the title Young radio arid electronics to other mounted an expedition to the Isle Amateur of the Year went to young people. of Man during July in conjunction David Martin, GMONVE, who lives David will receive a cash with members of Warwick School near Glasgow. Runner up was award of £250 and a guided Wireless Society. Ted takes up Simon Glanville, G7DCY from tour of the monitoring station the story: Coventry. at Baldock from the RA, and a " Warwick School Wireless The DTI (RA) sponsored number of other prizes from DAVID MARTIN was Society was first established in competition, which was open to industry. These include a GM7BPA when nominated for 1922. It has had its ups and anyone under the age of 18, AMR1000S 2m FM transceiver the YAOTY. Now GMONVE, downs over the years, but is recognised outstanding from Navico, a Tiny 2 packet he runs a young amateur's net currently going through one of its in Scotland and has converted achievement in amateur radio radio controller from Siskin 'up' phases. After taking part in a between 1 April 1989 and 1 July Electronics, and a digital ex-PMR rigs onto the amateur number of contests it was 1990, and encouraged a multimeter from Cirkit. The bands for both himself and decided to mount an expedition substantial number of entries. presentations will be made other amateurs as a cheap during the summer holidays to the way of getting on the air. A Both winners demonstrated at the RSGB's HF Convention Isle of Man. their all round contribution to at Coventry on 30 September. Venture Scout leader, David " Two things immediately gave has run a JOTA station for the the proposed expedition a shot in Vale of Leven District Scouts. the arm. Firstly, the welcome YAOTY RUNNER UP, Simon teachers and parents by giving: He is a member of the West of news of the club callsigns being Glanville, is G7DCY. A student demonstrations of the hobby. Scotland Amateur Radio released allowing non-licensed committee member of the He founded the school's Society and has recently members to speak over the air, Coventry Amateur Radio Remote Imaging Group which joined Raynet. and providing the rarity of the GT Society, he regularly assists a obtains data and weather David's youth work extends prefix. Secondly, the week before local elderly radio amateur who pictures from satellites. He is to being co-founder and we were due to set off, the RAE has problems using his hands. always keen to encourage the a ,reasurer of the Young results came out, the school Simon helps with setting up younger pupils to join, and ateurs in Scotland group, a scoring seven passes from seven equipment, antenna demonstrates club facilities at ! mber of whose members candidates. maintenance, soldering, etc. open days and parents' e preparing to take the RAE, At his school, Simon evenings as well as illustrating le younger members intend encourages an interest in operating procedures to study for the Novice amateur radio amongst pupils, students of the local RAE class, ace.

creating the biggest pile up of the week by operating GT4WKSIMM. VHF RadCom " On another occasion we were Convention Novice Column operating on 144MHz SSB near A REMINDER that next year's WE INTEND to produce a novice the summit of Snaefell when we VHF Convention at Sandown and beginners' column in met up with Harold. G3ACR doing Park is 24 March 1991. Details RadCom from January and are the same thing. His mission was Geoff Stone, G3FZL. Stand looking for someone to write it. apparently to climb Snaefell and bookings, Les Hawkyard, G5HD, Anyone who is interested please make contact with stations on The Eyry, Newton St Petrock, write to the Editor at RSGB HO other peaks in the UK. We went Torrington, Devon, EX38 8LU. giving details of experience. along as well, and braved Snaefell in a howling gale to work stations on Scat& Pike and Ben Nevis. Personal Loans At Preferential " The future looks exciting. Rates for RSGB Members. Seven new class B licensees are eager to take the morse test, as IN ASSOCIATION with TSB Loans under £1,500 - 22.5% GOKAO and GOGNF operating on 2m well as Steve, G1F1P, the school Direct Ltd, we are pleased to APR (Variable) from the summit of Snaefell. technician, who has had his announce the launch of a These rates are significantly interest rekindled. More students Preferential Loan Scheme for discounted against market rates " We arrived on the camp-site are keen to take the RAE this RSGB members. in general and in real terms by way of a fully laden minibus in year, while GOGNF. master in All R.S.G.B. members are represent a saving of the only rain during the trip. A charge of amateur radio, has eligible to apply for personal loans approximately £300 on a typical tractor was needed to get us out applied to become a novice up to £1,.000, for most consumer loan of £4,000 repaid over 3 of the mud on the site. Things got instructor. We're making plans for purchases and the facility is years, better as the week progressed. next year. ..". entirely unsecured, so your Other features include:- The Manx amateurs made us property is not required as * Flexible repayment period - 1 very welcome. No one collateral for the loan and no legal to 5 years complained of the extensive use fees are incurred. Repayments * Free Life cover made of the GB3GD two metre RA Report are made direct from the For further information and repeater by very newly licensed THE 1989-90 Annual Report of members bank account and there advice on all preferential services, amateurs. Instead, everyone was the Radiocommunications is no need to have an existing telephone FREE on:- 0800 very accommodating, inviting us Agency is now available, free of TSB bank account to qualify. 6266390 to their club meetings. Through charge, from The Librarian, Room Preferential rates of interest for or write FREEPOST to: our contacts with locals we made 605a, Waterloo Bridge House, members are as follows:- TSB Direct Ltd, Mallinson a very enjoyable trip round part of Waterloo Road, London, SE1 Loans of £1,500 and over - House, 321 Chase Road, the island on a converted lifeboat, 8UA, tel: 071-215 2368. 19.5% APR (Variable) Southgate, London. N146JF.

6 RADIO COMMUNICATION October 1990 .I RSONAL DETAILS

Amount required £ Period Mths il Purpose of loan Name Mr/Mrs/Miss/Ms Address Postcode Home Tel No. Date of Birth / At TSB Direct Are you: Married D Single D Divorced Eli Separated D Ages of dependent children we like to Name of 2nd applicant Occupation of 1st applicant say yes to Employer's name (Please state if self-employed) Daytime contact number R.S.G.B. Members Time with present employer years months

PROPERTY DETAILS Property type: House D Flat E Bedsit O Other D yes To that New Radio Equipment (cg mobile home) Are you? Sole owner D Joint owner E Living with parents D or New Car. Tenant D Time at present address: years months Loans up to £10,000 available for (If less than 3 years please enclose previous address) Home telephone number Property value £ most purposes. PAYMENT PROTECTION Please tick this box if you do not want this important benefit El

SAVINGS/CREDIT CARDS Name of Bank yes To Low Cost Borrowing! Account Number Sort Code I I I I I I I Unsecured loans at 19.5% APR (variable) Time with bank - years months Do you have any of the following (please tick): for loans of £1,500 and over, Building Society a/c D Deposit a/c CI Post Office a/c D Visa D significantly below our normal rates. Access D Trustcard D Other INCOME 1st applicant's net monthly income yes To "Peace of Mind"! 2nd applicant's net monthly income Other regular monthly income Free life cover is included for 1st Please give details (cg: child benefit pensions, investments etc.) Please endose last 2 payslips as proof of income.

named applicant, and in addition, EXPENDITURE optional payment protection cover Mortgage/rent/poll tax (per month) Finance company/bank loan (per month) can be arranged for a small Insurance payments (per month) additional cost. Other misc. outgoings (per month) Please give details (excluding domestic bills) Do you have a car? Yes E No E yes To Convenience! If yes, is it: Wholly owned D Financed E Supplied by employer E DECLARATION To apply — call free on So the TSB Group may provide a full service to me, 1/we understand that personal information may be passed to other companies within the TSB 0800 626390 or return the coupon Group who will hold it as confidential at all times. I/we authorise you to make any enquiries you may consider necessary for confirmation of the opposite. information given and for credit assessment and to disclose information relating to the loan account to licenced credit reference agencies. Written quotations are available on Information thus registered is used only to help make credit decisions, in fraud prevention and for tracing debtors. request. Signed Date

1st applicants full name

Signed Dite

2nd applicants full name

TSB Direct Limited, Freepost, Trustcard House, T S 1-9 Gloucester Place, W RFC:- Brighton BN11ZZ DRS1 0M 00 DIRECT MKA8 (RSGB) 9/90 N E W S REPOR'rS RSGB Liaison Officers Stolen IEE Nominations for Zone C Conference Essex: B.Gibbard. GOAZF Equipment 1991-1993 Gtr London (N): R.Charlesworth, AN ICOM IC-R1 receiver, serial on HF Radio number 890001213, was stolen THE NOMINATION procedure for G4UNL from the premises of RLOs was detailed on page 6 of Gtr London (S): R.Sykes, Systems Characteristics, 44 Hilderthorpe the June edition of Radio G3NFV THE INSTITUTION of Electrical Road, Bridlington. North Communication and valid Herts: P.Fairhurst, GOKLU Engineers has asked RSGB to be nominations were received as Norfolk/Suffolk: W.Higgins, Yorkshire, Y015 3BG on bank associated with this conference G3PNR holiday Monday, 27 August. shown below. As no more than which takes place from 22 to 24 Anyone having knowledge of this one valid nomination was No nominations were received July 1991 in Edinburgh. Topics receiver should contact G4NJP received for any post there is no for E Sussex, Kent, W Sussex. include (but are not limited to) requirement for elections to be on (0262) 673635, or their Systems Design, Control and Zone D nearest Police station. held. Management. Modulation and Berks: D.Chislett, G4XDU It should be noted that the The Radio Investigation Signal Processing, ECCM, Bucks: R.Ray, G3NCL Society's Membership Liaison Service Glasgow office have in Propagation, Noise and Guernsey: B.Ayres, GU1HTY Committee is authorised by their possession an HF amateur Interference, Antennas, Relevant loWight: D.Byrne, G3KPO Council to fill vacancies on an bands transceiver which is Aspects of Transmitters and Jersey: S.Smith, GJOJSY 'appointment' basis, and the first believed to have been stolen in Receivers, and HF Radar Somerset (N): K.Watkins, G3AIK list of RLOs for 1991-1993 will be the Central Scotland area. Techniques. No nominations were received announced at the Society's Anyone wishing to make a claim Any member who is interested for Avon, Cornwall/loScilly, Devon Annual Meeting in December. to this equipment should write to: in producing a paper on behalf of (excl.SE), Glos, Dorset (S)/Devon The District Manager. Radio RSGB should contact the (SE), Hants, Oxon, Somerset (S)/ Investigation Service, PO Box Chairman of the Technical and Zone A Dorset (N), Wilts. 2500, Glasgow, G41 10Y. Please Publications Advisory Committee, Cumbria: M.Gibbings. G3FDW quote the make, serial and Peter Chadwick, G3RZP, who is Greater Man: B.Catlow, G4ARP Zone E chassis numbers of the QTHR. Please note that no paper North Numbs: N.Bedford G4NJP Gwent: P.Dombrowski, GW1NY0 equipment when you write. can be offered on behalf of RSGB N.Yorkshire (E of R.Ouse and M&S Glam: C.Trotman, GW4YKL unless it receives prior approval. Swale): Bob Wilkinson, G4YKO Powys: P.Essery. GVV3KFE Similarly, members may not. N.Yorkshire (W of R.Ouse and No nominations were received Readers' without prior approval, use RSGB Swale): Gareth Foster, G1DRG for Clwyd, DyfedNV Glam, as their organisation or affiliation Tyne and Wear: Ian Batley. Gwynedd. Survey when registering. GOIID The final date for the No nominations were received Zone F AN ESTIMATED 1,000 readers submission of synopses to the for Cheshire, Cleveland/Durham, Belfast: G.Curry, GI6ATZ filled in the Readers' Survey form IEE is 25 October 1990. loM, Lancs, Merseyside, N Ireland (N): V.Mitchell, GI4ONL printed in August RadCom, and Northumbs, S.Yorks, W.Yorks. N Ireland (S): D.Campbell, very interesting the replies are. • A new amateur radio store GI4NKD An analysis will appear as soon has opened in west London. as we have finished ploughing The owner is Martin Lynch, Zone B Zone G through the pile. At this year's HF operating from 286 Northfield Leics: David Harries, G4WYN Borders: I.Wilson, GM4UPX Convention, eight lucky members Avenue, Ealing, London W5 Shrops/Staffs: K.Parkes, Fife & Tayside: M.Hobson, will have their survey forms 4UB; tel: 081-566 1120, fax: G3EHM GM8KPH drawn out of a drum and each 081-566 1207. The new shop No nominations were received Orkney: A.Wright, GM3IBU will win one of the super prizes is open from 10am to 6pm. for Beds/Cambs, Derbys, No nominations were received donated by our advertisers. Tuesday to Friday. Hereford and Worcs, Northants/ for Central, Dumfries & Galloway, Warwicks, Notts, S Humbs/Lincs, Grampian, HighlandNV.Isles, W.Mids Lothian, Shetland, Strathclyde. RSGB meets the kit manufacturers ON 16 AUGUST, UK kit Publications Advisory Committee manufacturers and other Chairman, Peter Chadwick, interested parties attended a G3RZP, covered areas such as meeting at RSGB HQ. EMC, the limited ability of the Secretary, David Evans, potential kit builders, xtal control G3OUF, explained the thinking vs VFO vs synthesiser, behind Project YEAR and why it harmonics/spurious, the CB was essential to promote the Statutory Instrument, safety and hobby amongst the young. A PME. Draft 2 of the RSGB report was given on the document "Novice Licence considerable progress being Equipment Standards" was made on all aspects of the handed out. He summed up by Project: the recruitment video, saying that it was essential that new books, a new magazine, the kits were of a high standard, Novice Licence, fund raising and, including the instructions. of course, kits. A lively discussion was inspired John Case, GW4HWR, by these presentations. A major N7MY0, G3YDV and G4BUO outside the OTH of KA7MCX in Seattle. G3YDV and G4BUO came world seventh in the World Radiosport Team Championships President Elect and Chairman of item of debate concerned how last July. A full report we will given in a future edition of RadCom. the Training and Education best to identify good kits, perhaps Advisory Group, detailed the by an RSGB seal of approval. training methods to be used for David Evans wound up the • There is a new QSL sub- • The new curator of the the Novice Licence. He meeting by pointing out that the manager for the G4PAA to RSGB's Audio Visual demonstrated some training aids Novice Licence was only a start G4PZZ series. This is Mr R Library is David Simmonds, which emphasised the hands-on and the idea was that Novices Colvin, GOBXQ, 46 Beech- G3JKB, Parsonage Farm, approach inherent in the scheme. would move on to the Class A or wood Avenue, Woodley. Binbrook, Lincoln, In addressing the matter of kit B Licences, thus expanding the Berkshire, RG5 3DG. LN3 6BN. specifications, Technical and kit market further.

8 RADIO COMMUNICATION October 1990 uality & ersonalised for you

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Mend FtSG81410•0« reffl Top Marques. a« I Coximax 8005, *000800 Briton Sports Shrrts àdi.ongelémOrraIdel .AmIwk in is% row.. Te4 80000 Credit card facilities are available. Roue 4.1 M OP . « .60 lambswool Sweaters Mim, OWL NM 181.1.. 11q. All previously issued order forms may be used - r elli beei '"*. M ein « halo Co.os erun lem Mai Re Wes SWIC11411.1.111•1381. WU. b.f. UV eo. L.11.00.171 . bin lap' ».61 bees la 61 M I« 34.31.311.48 0,4. payments should be made to Top Marques. Meteor...a n.« nO ndtel Pree £26 75 o we men oc• Prices remain as before. ',rot £15.95 I ki p( Sweaters Ho Di. Caw, go,.,.. lUm Ilbelt, Your orders should be sent to: War Gret.14 Tau Sen lo It C., 34. », Wet Pot £19.50 Top Marques, Dept. R. I The Street, Assington, .I.10..('IN2 Cea, fl.. ._ IL, MO. Asd 09.95 Colchester, Essex, CO6 SLW. CT . tb Mo. vow. ,...,uttnee II là 1042.14. Exclusive to RSGB Members Tel 0787 2111 54 W9-, rts/Wouses Smee. 0t 808000000 9 00 » anti PM ., gannet. (.404 to.p abel Worm Sew on Harn Bear 4',T lop 141 •1''CJWC S • tr be ley gated cellerbn 61. by cf..» • -• Net b « O W, Further details and new TO •P"..7tri d 1100 0« Cafe. el bur we N M .« R5G11 IIWa Yee efidobnix. œbin Met. 0. We...0 01.1 .00•1•4,C«.:» Velrlywed Mu m Wee Maca. . 0041, _gl 0000 Memel.W teàelmjihrol M.3..a poi Delloddy • try order forms are available ••••Co• ate »! Len a ear.» mortal". Man Mow «Mr IIAde • taped Met arms Sub Lill Pr008 'gr.» te ner; (7 ege n) •nc. £1.45 • £79.95 from the same address. Prb 18 99 MARQUES

RADCOM PCB SERVICE

G4WIM 50/70MHz TRANSCEIVER May/June/July 1990 BOARD DESCRIPTON CODE PRICE Complete set of boards 567WIM90 £66.13

G4PMK SIMPLE SPECTRU M ANALYSER November 1989 BOARD DESCRIPTON CODE PRICE RF Board 118946 £6.11 Video/sweep board 118947a £4.88 Marker generator/PSU 118947b £4.49

Complete set of 3 boards 1189SSA £14.38

G3TXQ TRANSCEIVER February/March 1989 BOARD DESCRIPTION CODE PRICE Main IF/Audio 028945 £11.50 VFO 028946 £5.46 Driver/Preamp 028947 £6.33 Low pass filter 028948a £7.48 Band-pass filter 028948b £4.60 Control board 038942a £5.18 Regulator board 038942b £2.30

Complete set of 7 boards 0289TXQ £27.03 HF NFD 1990 Chris Burbanks, G3SJJ, reports on the ever popular National Field Day.

Individual band reports by G410 M, G3MCX, G3FK M, G3HCT, G3LET, G3KDB and G4JKS.

P.0 TOGRAPF, 6401/0 It may appear somewhat the available frequency spectrum idiosyncratic to commence writing seems to quantify this years Field a report before the event takes Day and leading scores were place, but it seems appropriate to some 10% up on last year. Most record the feelings and teams experienced rain towards happenings around this time. the end of the 24 hour operating With just three days to go period, but it didn't do much to before Field Day 1990, adrenalin dampen the inherent enthusiasm is starting to flow and various for this annual trek into the open. rooms around the house become 28MHz produced a good storage areas. Camping gear, opening in the first few hours of tools and aerial equipment are the contest but the anticipated stacked in the garage, a spare second surge on Sunday didn't bedroom is full of suitable warm happen. Instead, on 21MHz, an clothing and the kitchen is used to excellent path to central and mid- store various cooking utensils. west Stateside was available in The radio room is the hub of the last two hours, particularly for activity with the receiver the Open section stations with constantly monitoring band beam antennas. 14MHz was G3SXW of the Triple A group (left), and G3VMW of Marple CG (right) celebrate in the time-honoured manner with adjudicator G3SJJ. Photo: G3JHF propagation. Tuning around perhaps the surprise this year 28MHz gives rise for concern; no with plenty of short skip into defection to the Open section absence with only VE1ZZ and the CW activity is logged at 1500 Europe. 3.5 and 7MHz carried previously mentioned, but also to odd UA9 present. (US1 A was in GMT and just a couple of DL their normal traffic with 1.8MHz the increased scores obtained by Leningrad!). stations on SSB with also a weak being pleasantly static-free. the leading groups. The leaders in both sections ZS OSO just audible. Sporadic E The intelligent use of planning relied on one main run and picked seems more like non-existent E. and strategy once again put up the loose ends in very short It is comforting to realise that, LEADER Leicester Polytechnic, G3SDC/P, return trips, whilst other front to a greater or lesser extent. BOARD in the award list with a leading runners made at least three visits. similar thoughts and activities are Intense competition is an integral score on 14MHz to win the Frank The most favoured start period taking place, not only around the part of the event and this year Hoosen, G2YS. Memorial Trophy. was between 2030 and 2100, British Isles but also throughout was no exception. Winners A record 16 Check Logs from though G3VM W1P did not hit the Europe since this is now an overall and also in the Restricted five continents were received: band until 2130. established IARU region 1 annual section are the Triple A Contest GOJFX/MM2 off Cape Town: In the Open section. G3TBK/P contest with the prospect of even Group. GOAAAJP. who have 223J0, who first participated in was the only station to reach the more participation in future years. honed their precision operating NFD in 1934 as BRS1431 and 1000 point mark made with 137 over the last twelve months, and then as G2S0 in 1936, thanks, valid contacts, despite having THE EVENT submitted the first ever winning Mal: VK5OG: ZUVV/P, whose fallen asleep during the session! entry using real-time computer operators were ex-G5BK: K3ZO, Restricted section band leader One hundred groups of logging and duping with full CW an excellent computer generated G3VM WIP had a perfect log with dedicated, and not so dedicated, interface. A true paperless log containing 316 contacts with 1132 points from 151 contacts. UK operators with their bands of operation. Runners-up in the G and European portable GOAAA/P also had a perfect log much appreciated helpers Restricted section were Marple stations, thanks for your valued but with five contacts less than immersed themselves in amateur Contest Club, G3VM WIP. no support, Fred: W1CNU; YB2FEA; the Marple group. radio contesting over the first doubt feeling disappointed at not YU7SF; YU7LS; OH3GZ; Fi Most other groups lost points. weekend in June. Agreeable taking the NFD Shield for a third G4BLX, G4JSN/P; G3BPM/P; Transcription errors and addition weather coupled with generally time. GOCLP/P; G3FXA; G3LIK. Many or omission of iP accounted for good propagation over most of Several top groups transferred thanks for all your efforts. the majority of loss. into the Open section this time, making the going even more BAND competitive, but once again 3.5MHz Verulam Club, G3VER/P, led the REPORTS Very few comments were section by quite a margin over received on this band other than Addiscombe ARC. G4ALEIP. 1.8MHz conditions were normal but no DX The Scottish trophy was won to speak of. K3Z0 appeared in for the second year running by Conditions were generally two logs and there were just a few Kilmarnock and Loudon ARC with reported as very good with low contacts with Asia. The only claim a similar score to last year but an static levels. although scores for six points was certainly /P but overall reduced placing. This were not as high as last year and was in fact Y54 and not YS4 as being partly attributable to the DX was conspicuous by its logged.

A W A R D WI N N E R S

NFD Shield: Three A's CG GOAAA/P

Bristol Trophy: Verulam "A" ARC G3VER/P G6ZR Memorial Trophy: Addiscombe ARC G4ALE/P

Gravesend Trophy: Marple C.C. G3VM W/P Scottish Trophy: Kilmarnock & Loudon GMOADX/P

The aerial farm of GM3GRCiP near Frank Hoosen Memorial Trophy: Leicester Poly "A" G3SDC/P Auchmuty in Fife.

10 RADIO COMMUNICATION) October 1990 HF NFD 1990

pfta Pf G48U0

Mind that ATU! Gravesend Radio Society: G3GRSAD. A useful check-log was supplied by ZUVV/P

Restricted section entry, modestly equipped stations were G3VM W/P with 543 points from groups started off on the band, GOBRC/P, were overall band rewarded with some DX and 162 contacts, followed closely by but not many made an early leaders but with a score down several Open section entrants G3RAC/P - 530/163. The only morning check, with the exception about 200 points from last year, were seduced by their beam other group to exceed 500 points of G3ZRS/P hooking a station at although the multiband entries antennas into spending more time was a single band entry from 0514 and G3WKX/P catching a had slightly increased scores. on the band than perhaps they G3GHN/P with 508 points from VK7 at 0554. Leading Open section entrant should. 166 contacts. In the Restricted section, was G3UES/P despite losing 71 The top stations avoided peak G3VMW/P made 5 visits to the overall band leaders G5BK/P points during adjudication. DX hours to concentrate on band with their most productive scored 806 points from 120 Runners-up G3GRS/P and European portables with time between 1700-1900 which QS0s although this was less than G3VER/P both had error free GOAAA/P securing just the right netted 110 QS0s, of which only half of their chart topping 1988 logs. mix, with 166 points per hour from 25 were outside of Europe and 67 score. This was followed by A comparison of claimed 11 carefully timed visits to the were portable. GOAAA/P with 766/112 and scores to time spent on the band band. Several multiband stations G3RAC/P visited the band ten G3VMW/P 752/111. Leading shows GOBRC/P at 868 points for topped 850 points with G4ALE/P. times with a peak between 1651 Open section entrants were 24 hours, G3UES/P 744:9.5, G3NJNP and G5LO/P all and 1742 when they made 51 G3VER/P using a four-element G3GRS/P 634:3.5 and G3VER/P breaking the 1000 barrier. Triple contacts; 8 were outside Europe quad and a dipole to make 774 606:3.2. Most traffic was carried A commented that this year's and 36 portable. Both groups from 110 contacts, G3ULT/P 724/ from 2030 to 0430 with the peak score was their highest for seven made almost the same number of 110 and G3UES/P 680/103. at 0000-0200 and, provided that years. contacts, 162/163, and portables, DX worked over the 24 hours only short visits were made, a G3SDC/P are clear winners of 89/91, though the Restricted ranged from RW9 and JA through high scoring rate could be the Frank Hoosen. G2YF, section entrant worked more EUs to VK and ZS, but very little achieved. Memorial trophy with a single stations outside Europe, 36/25. Stateside traffic. band entry and the help of 280 Logs were generally good with W/VE contacts using a 5 element the exception of one of the front 7MHz Vagi and a vertical antenna. runners on this band losing some FACTOR X Band conditions appear to have 40 points after claiming 3 points One entrant, commenting on the improved this year judging by 21MHz for every Russian OSO they had! consistent success of the Triple A comments received. One station Contest group, attributed their commented that K3ZO's signal Conditions seemed down if 28MHz achievements to what was was stronger than most results are compared with last described as Factor X. It was this Europeans at times so it was year's winning score of 763 points Propagation was patchy with the comment, and a recent disappointing that other US from 250 contacts. Closer western advantage apparent but discussion with AI, G3FXB, which stations didn't join in the fray. examination of the logs, however, not so great as in previous years. provided the words motivation, Open section leader was reveals that in the Restricted Band conditions taken overall dedication and experience, that G3RIR/P with a single band entry section scores were well up on were better than last year with prompted a more in-depth look at gaining 1561 points from 484 last year. G5BIQP and GOAAA/P more than the top operators. contacts. They had obviously put Overall band leader was doubling their scores. Most G3SXW, G3TXF and G3WVG some thought into their strategy P.07 OCRAP. C.101, of Triple A, together with G3VMW and had a good selection of and G3WPF of Marple, were all antennas at their disposal. These licensed in the mid 1960s. Like included a Bobtail curtain, a many of us who came into the W8JK, and two half waves in hobby around that time, they had phase. Top Restricted section no Armed Services background, entry came from G3GXI/P making but were interested in the self- 351 QS0s for 1143 points. training and spirit of adventure With isolated exceptions, the that was offered by the hobby. standard of log keeping was Now in their early forties, and excellent, certainly the computer after some 25 years of dedicated is proving to be a great help in the DXing and contesting, these preparation of entries. operators are probably at their peak of operating skill. 14MHz

This band appears to be taking Turn to page 62 for the over from 7MHz as the basis for conclusion of this report plus building up a good foundation score and was once again open the full tabulated results. throughout the contest. Even The sophisticated station of G3UJVID.

RADIO COMMUNICATION October 1990 11 -LOWE ELECTRONICS LTD.

KEN WOOD

TS-950SD £3,199 The new HF standard bearer for Kenwood, and the standard setter for the rest of the industry. The TS-950S with its remarkable Digital Signal Processing system represents a real step forward in generating the best sounding clean transmitted SSB and CW signals possible. Coupled to a low distortion PA, the TS-950S helps to clean up our crowded bands as well as giving pleasure to its lucky owner. See it soon, or send for details right away.

KEN WOOD ...... _ ....,.. — 2

'i 2 G C • « . ' ...... £1,995 — •II. • '' '.... 1 • -of TS-940S .— ini0 — no lem;noo. I* 8.1 ...... ane w.-- mmen..- -,. .._'. ' W M m u m e --‘.›."--- .' -•••• •••••• _:. This is the most respected HF transceiver in the world. and has maintained its lead over all the competition. .:.: Z. Z.> M ilife e' :: " Alili tle. • e le .402 M i tug .""...... - - , ,,,,,----- • • • Ili A 74u m u r _ ..:..,.. Check what the leading contest stations are using, and ::: ••• . '/14•••• .' you will find the TS-940S at the top of the list. . ,, ...C.. nre .. a. MI IMAM Mil MI t» «U r 7 Uncompromising performance, unrivalled facilities, and .... .11 ) • '14,...:, - ,_ M E N O M el• f- ett..4. uncanny ease of use make the TS-940S the HF ...... )._— Miiiw e . .... transceiver which you will want to own one day.

I

TS-440S £1,138 The TS-440S is probably the most successful HI' transceiver ever made by Kenwood, and this is no surprise when you realise that it is virtually a mobile version of the TS-940S. I can't put it better than Geoff Arnold in his review of the TS-440S: "The receiver in particular is a joy to use". He was not wrong, and just ask any TS-440S owner to confirm it. All band, all mode operation, with a receiver covering 100kHz to 30MHz; the TS-440S is unbeatable at any price.

KEN WOOD

1,1111111e :ti.L) L7L7J7 -ser _ mikA TS-140S £862 The TS-140S was in effect designed by our customers, IN•12Oted raven, es who demanded Kenwood performance and facilties at

.14 11 modest cost. The TS-140S has all mode, all band HF

,_ AIN - • coverage, and of course a high performance general " 12 11. . •., coverage receiver. 100W output and a first class receiver am D Aug> a aa . . - combine to make the TS-140S a really satisfying rig to mml ••• ; own. It's also available in the form of the TS-680S which has all the bands and modes of operation of the TS-140S but with the 6 metre band as well.

HEAD OFFICE & MAIL ORDER: Chesterfield Road, Matlock, Derbyshire DE4 5LE

S h ur » In GLASGOW Telephone 041-945 2(126. DARLINGTON Telephone 0325 486121. CAMBRIDGE Telephone 0223 311230,

12 RADIO COMMUNICATION October 1990 There is a branch near you The all-new TH-26E from Kenwood Quick Questions. * What covers 2 metre FM and optionally 136 to 174 MHz? * What offers you channel spacings of 5, 10, 12.5, 15,20 and 25kHz at the touch of a control? * What offers you bright easy-to-see readout of all frequencies and functions right there on the top panel? * What offers you 20 multi function memories, and even automatic memory filling of a series of channels at your choice? * What offers you three TX power levels from 20mW to 5W (with PB8 pack)? * What offers you auto battery saving and auto switch-off? * What offers you auto repeater offsets, and full reverse repeater operation? * What offers you a range of battery options and even the facility to run directly from any dc supply from 6 to 16 volts? * What offers you a tone alert system to tell you that a call has been received? * What offers you optional dual tone coded squelch for "private channel" facilities? * What offers you an optional DTMF keypad for tone access, and storage of DTMF codes to 15 digits? * What offers all of these things in the best engineered hand held transceiver in the business, at the keenest price, and with all the special ergonomic "feel" which only Kenwood have managed to achieve? The answer is the all new handhelds from Kenwood; the TH-26E for 2 metres, and the TH-46E for 70 centimetres. Honestly, when I held and used a TH-26E for the first time, I was amazed how simple it was to use (even for a geriatric like me), and yet with all the simplicity, there were features and functions which meant that whatever I demanded from it, the transceiver delivered it and more. You really have to see and hold these attractive new hand held rigs to appreciate how good they are. We are here to show them to you, so call in at your nearest Lowe branch and talk to Richard, or Fred, or Ceri, or Colin, or Tony, or Hank, or Sim. They are as enthusiastic as 1 am myself about the all new TH-26E and TH-46E from Kenwood, makers of the world's finest amateur radio products bar none.

TH26E 2m transceiver £249.00 TH46E 2m transceiver £269.00 SMC33 remote control speaker/mike £28.50 DTP1 DTMF keypad £14.50 DTU1 DTMF unit £14.50

Random Ramblings Leicester is here, and we are all looking forward to meeting you all if you can get to the show — acknowledged to be one of the best, if not THE best, in England. I don't need to tell you the stand number 'cos you will fall over us when you enter the hall. New goodies from Kenwood will centre on the exciting range of handheld rigs for VHF and UHF. The range is now completed by the TH -27E and TH-47E mini size maxi performance handies for 2 and 70, the TH-26E and TH-46E for those who want high power and rugged use, and the really new TH-77E dual band 2/70 handheld which can have extended frequency range receive, and will operate cross band duplex or repeater mode. All your favourite people will be on the stand:— Beryl and Julie, of course, Richard from Matlock and the new Richard (but you will all recognise him as Richard McLachlan, G30QT) appearing for the first time as the commercial director, and if they let me out of the cage you may even see G3PCY (who is he?). See you all on the day. John Wilson G3PCY

Telephone 0629 580800 (4 lines) Fax 580020 All branches are closed all day Monday. S. WALES (BARRY) Telephone 0446 721304, LONDON Telephone 081-429 3256 BOURNEMOUTH Telephone 0202 577760

RADIO COMMUNICATION October 1990 13 South Midlands Cc SMC SCHOOL CLOSE, CHANDLERS FORD IND. EST., EASTLEIGH, HA WHY NOT COME AND SEE US ON STAND

S8 AT LEICESTER FOR SOME SHOW SPECIALS Either the amazing FT747GX

Light in weight and low in price, the FT747GX, is a high performance HF rig with a great receiver and full power transmitter. With a refreshingly simple control panel the FT747GX is ideal for hopping around the bands chasing those exotic DX stations. Full 100W PEP and factory installed filters for CW & AM give improved performance on today's crowded bands. All this housed in a high impact metallised plastic case, FT747GX must surely be too good to miss especially at such an attractive price.

OTHER OPTIONS INCLUDE MMB42A MOBILE BRACKET £65.00 NOW _e c A n D3000568 FM UNIT £39.99 D3000561 TCXO UNIT £46.00 FP757HD P.S.U. £258.75 ONLY Z Milie inc VAT FC700 A.T.U. £149.00 WITH CW & AM FILTERS FITTED AS STANDARD

or the incredible FT736R

With YaesuS new F r•736R VHF/UHF base station, you can discover some of the best gu m DX happening in ham radio. Via moonbounce. Tropo. Aurora. Meteor scatter. Or AISZ7 satellites. You see, the FT-736R is the most complete, feature-packed rig ever designed for the serious VHF/UHF operator. For starlets. the FT-736R comes factory-equipped for SSB, CW and FM operation on 2 meters and 70cm, with two additional slots for optional 50MHz or 1.2GHz modules Crossband full duplex capability is built into every FT-736R for satellite work. And the satellite tracking function (normal and reverse modes) keeps you on target through a transponder. The FT-736R delivers 25 watts RF output on 2 meters and 70cm and 10 watts on 6 meters and 12GHz. Store frequency. mode and. repeater shift in each of the 100 memores. For Serious VHF/UHF work, use the RF speech processor. IF shill. IF notch liner, •CW Narrow Optional and FM wide/narrow IF filters, VOX. Noise blanker. three-position AGC selection, Preamp switch for activating your lower-mount preamplifier Even an offset display for measuring observed Doppler shift on DX links. And to custom design your FT-376R station. choose from these popular optional accessories: Iambic keyer module, FTS-13 CTCSS encode/decode unit, FVS•1 mock synthesizer. FMP•1 AOS digital message display unit, 1.2GHz ATV module. MD-lE18 desk microphone. E--736 DC cable, and CAT (Computer Aided Transceiver) system software.

for only Vnarrow oftfional Can be easily modified

for 9600 and 1200 baud £1199 inc VAT PSK packet operation.

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4 RADIO COMMUNICATION October 1990 nnmunkations Ltd. YAESU ITS S05 3BY TEL 0703 255111 FAX. 0703 263507 TLX. 477351

ON YAESU HANDHELDS

ShIC ARE PLEASED TO ANNOUNCE SOME VERY SPECIAL PACKAGE DEALS ON VHF/UHF HANDHELDS. IF YOU BUY ANY OF THE FOLLO WING HANDHELDS WITH AN FNB10 NICAD WE WILL GIVE YOU AN SMC28 WALL CHARGER ABSOLUTELY FREE. A SAVING OF AROUND £14.

FT23R + FNB10 SMC28 £239 FT7311 + FNB10 + SMC28 £249 F1411 + FNB10 + SMC28 £249 FT811 + FNB10 + SMC28 £259 F1470 + FNB10 + SMC28 £384

ONLY AVAILABLE WHILE STOCKS LAST HX240 2m to HF TRANSVERTER et> cel• HX240: 2m to HF Transverter Only Frequency Coverage: 80m, 40m, 20m, \\•\ 15m, 10m Output power: 30-40W PEP (SSB/CW) £249.00 RF Drive: 2.5W/10W Selectable Rx Preamp Gain: 8-10dB Inc VAT Power Requirement: DC 13.8V, 7A Additional features: Carrier operated switching or by remote socket, power output meter, switchable prea mp Hi/Lo output selectable, visual indication of antenna missmatch. ALSO AVAILABLE HX640 for 6m TRANSCEIVERS A PERFECT MATCH FOR THE FT290R2/FT690R2

What could Yaesu engineers do to improve on the hugely popular FT x 9OR series? The answer was easy, they designed and built the FT x 90R2 series. The FT x 90R2 series of transceivers provide high performance and a 2.5W output, when used with 'C' cells or rucads. ideal for serious portable operations, or when combined with matching linears, and easy to use compact multimode mobile or base station. What more could you ask from a transceiver?

FT290R2 RAP £429.00 inc

FT690R2 RAP £429.00 inc

FT790R2 RAP £499.00 inc

ALL THE ABOVE ARE SUPPLIED WITH FBA6, MH10E8, STRAP AND ANTENNA AS STANDARD.

CARRIAGE CHARGES TREE FINANCE ON SELECTED ITEMS Carriage ts charged on all items Small items, Plugs, YAESU DISTRIBUTOR WARRANTY On many regular priced items SMC offers Free Ftnance (on Sockets etc by post £1.75. Antennas. Cables and Importer warranty on Yaesu Musen products Ably 'mace balances over E129) 20% down and the balance over larger items by LYNX from £5.75. Transceivers etc, staned and eguepped Service Department Daily 6 nx/nths of 50% down and the balance over a year next day delivery from £8.35. Overnight deltvery can contact with the Yaesu. Musenfiactory Tens of You pay no more than the cash pnce' be specified at extra cost for other items Same day thousands ot spares and lest equipment Dottie of debt° items available on request despatch whenever possble 'Subject to status PRICES & AVAILABILITY SUBJECT TO CHANGE WITHOUT PRIOR NOTICE

RADIO CO M MUNICATION October 1990 15 South Midlands SINE Communications Ltd. USED EQUIPMENT HF TRANSCEIVERS 441SCELLANEOUSIACCESSORIES inc. VAT Inc. VAT F10140 shack HF 100W Gen. AX Se from £1095.00 FC757AT Teem/ Auto MU 300W S/H F7980 shack HF 100W Gen. AX SIS from £1095.00 144/726 module 2mIr plug in (FT726) SO4 £159.00 FT767GX shack HF 100W Gen. AX S/S Iron £1275.00 FEX 144/767 module 2ner plug In (F1767).- -- ...... --,- SIN £139.00 FT757GX-II noble HF 100W Gen. AX S/S £775.00 LP50-3.50 Einos VHF Li amplifier 50W.... S/S £I39.00 FT747GX mobile HF 100W Gen. 12r DC Gen. AX S/S £625.00 LPM144-1-100 8nos VHF Lin/amplifier 100W . S/S £199.00 HTI20 mobile HF lOW 20mtr 12r DC S/S £249.00 MML432.00L kUrnod UHF UNampfiber 30W . SIS £139.00 OSCAR II mobile C8 40CH Ifinv 12v DC S/S £39.00 14141432128S W mod 70crn to 1Orntr Transvert. £199.00 FL7000 HF 980W L./amplifier S/S £1391.00 M11128/144 M.ImOd lOrno to 2rntr Transvert Se4 £35.00 MMA28 ralmOd 10001, MX pro amp S/H £19.00 k0.40050 PalmOd. Pisa Pre scaler .. - S/S VHF/UHF TRANSCEIVERS AllAC1S6/23 £2695:00" 28SWR/PO lo 156M14/ WER 3510(manna) 1509410 ...... - 5/04arm £10.00 F1736 snack VHF/UHF SIS £1190.00 JD110 171.3101 SWR/PO WER 50 to 150MH1 SM £39.00 FT711RH mobile UHF 70cm 4SW SIS £295.00 F5711V melon 2mtr to lOrre convertor. S/H £25.00 FT227R mobla VHF2rntr 10W .. -- ...... SIN £139.00 DC144/26 Dulong Auto woodpecker blanker ...... -.. - £69.00 FT703R handy UHF 70cm 2.5W SIN from £139.00 5882 Datong ars Tel HF.Mulitband rem anl NS £15.00 FT73III handy UHF 70cm 3/5W (no ball) Sill front £179.00 TP30 High imp. list 9/IC S/S £19.95 KDK.FM2030 mobile VHF 2mIr 25W... SJH C169.00 202 Shure Yaesu 7 pin 600 ohm fist 4/IC SIN IC.12710 shack 1200MHz IOW FM, SS8, CW S1F1 £775.00 014417 6 pm 600 ohrn fist MIC SM FT727R 'randy VHF/UHF 3.5W dual band SS £319.00 Y1431 SAOSti Headphones 8 ohm S/S£££1595 .:090 005 SAGRA.600 VHF Lin/amplifier 600W S/S £659.00 Y/477 Yaesu 7 pin min switch boa SIN £15.00 HL.160V25 VHF bn/amplifor 160W S/S £199.00 502 Yoesu S810 Yoesu 8 pin rnic. »itch box S/H £15.00 Salsa 45rnm enlarger 41C90 HF roo/ole ant. S/H £7.00 RECEIVERS 9:0: RSL Taesu NS from £ 21 0 FRG8600 shack HF/SW Gen AX mfmodo S/H from £545.00 RSM2 YaO4U CuttertcabLe /Him. 97/0 5 8HFRG7 Yaesu Ball tray foe FRO7 ra NIO £5.00 F RG96.001A scannor VI-IFilJHF 60.950MHz RX. SIS Irorn £459.00 MI481 550SU Mobile mounting brk. C5.00 AR2002 scanner VHF/UHF 25-1300MHz AX W O C497.00 Yaesu Rotator (Contra Only - /V SWO MX7000 scanner VHF/UHF 25-1300MHz MX W O £349.00 KR5400 Rotator (controlon MS £5695..00® AIRBAND-RX handy VHF/AM 118.135MH2 AX S/S £99.00 KR5.00 Sarni/ KR400 Yaesu Rotator Icon1001 Only ICF20010 Donna° HFNHF receiver ...... - S/H from £219.00 KR500 'roes,/ Pololo. elevation type - NSsis £59.00 C045 Hygam DATA/COMPUTER Robalo.only) (coma - NSPeale. medlum duly ££14290..eo00 AR.40 Hygain Antelo.. lighl duty - S/13 £159.00 FIF232C Ya m., RS232/radio Interface - S/S £59.00 AR.30 Hygain Rotator. light duty £4499. .0000 TONO-5000E NUnit Ambo.. Fitly, Ascii. CW SIC WO £659.00 SKYKING £59.00 70N0.777 modem Armor, Atty. Aacu. CW - S/H £149.00 K1500 Winch, aulo brake ...... -...... W O AMT-2 modem Awned. Rny, Anil. CW SIII from £139.00 11200 Winch, standard lype i . NS £19.95 MMT4001 7/unit Ally. CW chy keyboard ...... ----- SIS £159.00 11.14A432u Mutek 70cm Pre amp£29.00 MIO 8d8 Manual« W O £19.00 MULTICOM modom Fitly G3LIV data unll S/S £39.50 VFAT206 Mutek 40.11000 M et to morse cony - SIS £49.00 310/70 70Mhtz moble ant. AIS £15.00 KP100 keyer CMOS boye' OM paddle WS £79.00 HALO/432 70cm 'noble Halo WO £11.00 RI/I modem RS232-77L Interfere° - SIS £68.00 H513008 Wateband pre-amp/4M WO £59.00 VP601 Ascl. keyboard. - NS £3209.00 SP4 SMC RF speech processor NIO £19.00 MP-100 Tro Kenwood mounting bill....,,...... S/H

KEY: S/S SHOP-SOILED/EX-DEMO 3 MONTH WARRANTY SM SECONDHAND.. 3 MONTH WARRANTY NID NEW oesocescsroi 3 MONTH WARRANTY NS AS SEEN vier H NO WARRANTY

ROTATORS STRUMECH VERSATOWER MORSE KEYS

Superb engineering standards combined v.e po sharp selling MINITONER 106110 Seem 3 0 0 0 accuracy means new ICNICP30 3CFT PosT MOUNT . £53076. technology from Yaeso tea m° »7 BASE RATE MOUNT £56211. icmicemo 3oFr ma) BASE MOUNT. C522.49 creale Kenoro Hygen. STANDARD 136120 SERIES 3M20P25 25FT POST MOUNT £45885 ROTATORS 3MZP40 40FT POST MOUNT £646 30 AMC& OFFSET TYPE 3 %ME 08.50 MOPED 60FT POST MOUNT £761.3:1 G250 BELL TEPE UST/SNITCH CONTROL £ra.00 261206825 25FT RED EASE MOUNT £317 mCASE KEYS PP G4C0 BELL TYPE METER CONTROLLER £13995 361266640 40FT AXED BASE MOUNT. £48185. 447o2 smote KEY. £4275 £1.75 G4CORO BELL TYPE ROUND CONTROLLER £1692 3612C61360 66FT RED aAsE Moen £596 85 •i47a3 smAtaKT KEY £49.69 £I.75 aai TYPE ROUND CONTROLLER _ 1219.00 3MBISP25 25FT BASE PLATE MOUNT £S41.65 HK704 Spleen KEY £26Z £.75 CO/5 BELL TYPE METER CONTROLLER £218.90 36120Pa° 4(FT BASE PLATE MOUNT £75065. i-X705 $IRMGHT ILcY £26.25 £1.75 HAM1V BELL TYPE METER CONTROLLER £327.00 39/208760 60FT BASE RATE MOUNT £84525 Hvo6 sTRAIGHT KEY £28.95 £1.75 TZ( BELL TYPE METER CONTROLLER £499.00 39/29125 25Ff MOBILE TOWER £2179 25 n1(701 STRAIGHT KEY £25.49 £.75 GICOSIX BELL TYPE 453 DEG VAR SPO 1325.00 161201.140 40F7 NOBLE TONER £238740, pKTO8 STRAIGHT KEY f26.45 (1.75 GIOX6DX BELL TYPE 450 DEG VAR SPEED £68.00 9129160 60FT MOBILE TOWER t256760. HK710 STRAIGHT KEY £41.75 £1.75 G2CCOFIC BELL TYPE ROUND CONTROLLER . £445.60 HK711 STRAIGHT KEY KNEE MOUNTING HEAVY DUTY 1DA20 SERIES £4I.75 £1.75 11/1500 ELEVADON METER CONTROLLER S149.95 31000 MECHAMCAL BUG £41.45 £2.03 KRUM £279.60 66129,40 4UFT POST mom pre 70 66120P60 Dr POST MOUNT ...... maw 9/4701 SINGLE LEVER PADDI . £38 35 £1.75 BELL TYPE ROUND CONTROLLER £219.00 9/4702 SINGLE LEVER PADDLE...-. £41 50 £1.75 9129083 80FT POST MOUNT £1426.00 ROSA-) BELL TWE VAR SPEED AND PRESET £425.00 1.14703 SQUEEZE KEY £37.00 £1 75 9466610 40FT FIXED BASE MOUNT £644.00 RC58.3 Bat. TYPE VAR SPEED AND PRESET £675.60 1.1470( £24.99 £1.75 66420F1350 6901 FINED BASE MOUNT £763.60 .£4335 012.78 £1.75 ROTATOR HARDWARE 9,4200380 eopT AXED BASE MOUNT £1219.60 9/4706 05.60 £1.75 MOMS ALIGNMENT BEARNG AR293XL (17.50 69/209143 Mr ME PLATE MOUNT £85160. HKE02 DELLIKE BRASS KEY .£99.95 C2.50 6S505 ROTARY BEARNG MAST £19.95 661236P60 EoFT BASE RATE »UT £96220. «803 DELUXE BRASS KEY £89.95 £250 GS4365 ROTARY BEARNG 2- MAST £29.45 69/208183 NET BASE PLATE MOUNT £153365. HK834 DELUXE BRASS KEY ..._ £95.60 £2 50 GC038 LOWER MAST CLAW G-4CO. 500 et £16.95 MO W

SOUTHAMPTON (0703) 255111 LEEDS (0532) 530606 CHESTERFIELD (0246) 453340 BIRMINGHAM 021 327 1497 AXMINSTER (0297) 34918 For full addresses see display advert

16 RADIO COM MUNICATION October 1990 must have been on the HF bands SPECTRU M only but there is no restriction on 1990 28MHz COUNTRIES TABLE mode or band. Send certified list GOIZU 198 G4NX0,44 so ANALYSIS with US$3.00 or seven IRCs to 1:34MUW 179 GOMXU se G4VVP 176 GOCKP 79 Joseph Obstfeld, 4X6KJ, P.O.Box 04DXW 160 G2AKK 79 (0W) 873. Kiryat-Ono 55000, Israel. GM4013K 131 GM4211. 83 G4S.K3 60 HF OLIMPIADA CULTURAL BARCELONA-92 and state the actual output power America CW Contest the only JOHN ALLAWAY G3FKM Gained by working EA3-EC3 used. All entries must be UK entrant seems to have been 10 Knightlo w Road, Birrn,ngha m stations between 1 September postmarked no later than 1 GM3CFS who scored 32,494 017 8 013 1990 and 9 August 1992 (the last December 1990 and sent to CO points in the multiband section. day of the Olympic Games). Only Magazine, 76 North Broadway, In the 1989 VK/ZL Oceania one OSO on each mode on each Hicksville, NY. 11801. USA. DX Contest (CW and Phone I'm sorry to have to report the band may be counted and there Sample log and summary sheets sections) G5MY should be death of Marjorie, wife of Geoff must be at least 20m between are available from CO in ex- congratulated, as he appears to Watts on 29 July. During the 60s contacts which each count one change for a large SAE and some have been the only UK entrant. and 70s when Geoff produced DX point. Europeans need 50 points. IRCs - please note that I do not He scored 598 points in the CW News Sheet it was Marjorie who Send certified list of contacts to have any of either of these event and 850 in the phone. A folded all the copies and took Radio Club Baix Penedes, Box documents. pretty dismal turn-out from the them to be mailed around 250, 43700 El Vendrell (Tar- UK! midnight (or later) every Tuesday, ragona), Spain. 1990 Co WW RTTY DX as well as answering the CONTEST titteittLeimout_ ' telephone and opening the mail. CONTESTS Ain 0000 29 September - 2400 30 Unfortunately she had been A letter has been sent out from September suffering from multiple sclerosis Mustafa, TA3B, Unlit. TA3C, CO WW DX SSB CONTEST Sponsored by CO and The and had been unable to use her Yasar, TA3D. and Levent, TA3F. RTTY Journal. I can provide limbs for the past eight years. It is 0000 27 October - 2400 28 They are in Izmir and point out photocopies of the rules. largely due to her that DXNS is October the great difficulties they are now one of the world's leading facing in receiving incoming All bands 1.8 to 30MHz ON CONTEST newsletters. Thank you Marjorie. (excluding WARC). Single- O ns. They are receiving many Robin Scadden, G3TFM, operator, single and multi-band, 7 October - 3.5MHz SSB complaints from those who have reports that someone else is multi-operator single and multi- 14 October - 3.5MHz CW not received cards from them and using his call on CW on 21 and transmitter and ()RP classes (this 21 October - 144MHz phone and they want everyone to know the 28MHz, and on SSB on 28MHz. allows up to 5W output. Ex- CW. problem lies with the local Post In the past three years he has changes are RS plus CO zone In each case the contest runs Office. In future please mail cards only been active for very short (we are in Zone 14). OSOs with from 0700 to 1100. Only OSOs by registered mail or otherwise spells on 144MHz and packet. own continent count one point with Belgium and with DA stations send them via Thomas Vortkamp, and with others three. The are allowed. Exchange RS/T plus DL5YCQ, who will pass them on. ALBANIA multipliers are the CO zones, serial number (from 001). ON/DA Another letter of apology. This WAE countries and DXCC stations will give their club code, one from VU2AID who has written In a message dated 31 July. countries from each band added and Belgian old-timers will give to GOEGE about the VU40 Jacques Pecourt, F2YS/W2, said together. Own country may only the year they were licensed. Each Award. Originally VU2AID was "Peter. HA5WE, has returned to be worked for country/zone credit. ordinary contact counts three used as the address for applica- Budapest from Tirana and the ZA Use separate log forms for each points, with an old-timer five. tions, and he collected them operation has been delayed band and give date. UTC, station Each club worked is a multiplier. before forwarding to VU2TN. For towards the end of the summer at worked, numbers out and in, and Listeners may enter and should a number of reasons they have the explicit request of the Prime points claimed. Mark new log time, station heard, code not all been sent out. VU2AID is Minister of Albania. Peter's multipliers clearly. Check for given, and callsign of other attempting to meet VU2TN and licence has been approved by the duplicate OSOs - the presence of station. Points as for transmitting take over the records to remedy appropriate ministries and by the these can cause disqualification. section. Logs should be sent the situation as soon as possible. Council of Ministers, but in view of Those working more than 200 within three weeks of the contest VU2AID is usually on 14.150MHz the delicate political situation in stations on any band must to Welters Leon, ON5WL, at 1400 in the 'AIR Net' and says Albania, the Prime Minister feels enclose a 'dupe sheet' for that Borgstraat 80, B 2880 Beerzel, that he will collect information that it will be beneficial to band. ORP entrants must clearly Belgium. about applicants over the air. postpone the dxpedition for at note the fact on their cover sheet In the 1989 WW South One of the founders of amateur radio in the Falkland Is, Alan least one month. Peter has p flOGRAPn CUONN stressed that ZA1AA and ZA1CZ Betts. VP8A1, who was first are not licensed Albanian licensed in 1937, died recently stations. Peter and the sponsors aged 75 years. By the time he urge that the above statement be had built his equipment WWII had taken at face value and that any broken out so he didn't get on the further elaboration of the facts by air until 1945 and was the only anyone else should be treated as active VP8 during the 1950s. rumour. Further information, Most of his contacts were made including start-up date and on CW using 30W. Don Betts, frequencies will follow". I have VP8ON, asks for OSLs to the heard nothing since... address in 0TH Corner. He answers all cards received direct by air-mail. Cards for any VP8 AWARDS station may be sent do Postmas- ter, GPO, Stanley - but only if K1RYAT ONO AWARD their direct 0TH is not known. It is Issued by the Israel Amateur important to use airmail as many Radio Club to those who have are only on the islands for a short worked four stations in Kiryat Ono time. since 1 March 1990. It consists of Mike, RA3YG. has written to a 30 x 21cm coloured drawing of say that during the period 15 June specific landmarks of the city and Harry, DL8CM (left) and Martin, G3ZAY (HF Committee Chairman) discussing to 15 July, working from Kolguyev is signed by the Mayor. QS0s Penguin Island at Friedrichshafen. Is. (IOTA EU -85) 4K3PA,

RADIO COMMUNICATION October 1990 17 SPECTRU M ANALYSIS

4K3PWB, 4K3/UA3YCA, and total charter fee is $90,000). Early 4K3/RA3YG made more than in August they had collected anni CORNER 25,000 QS0s, many of which $2,000 and pledges for a further C6A/G4RWO Bureau or K.J.Cheetham, Callingwood Hall. Tatonhill, Burton on were with the UK. OSLs should $11,000. Contributions go to Trerrt. Staffs, DE13 9SH. J49G SV9ADH, Potyrrinics 34, GR-54000 Chanla, Greece. be sent only via RA3YG, who is Gerry Branson, 93787 Dorsey RA3VG Mika E.Sochinski, PO Box 5, Briansk. USSR. organiser of the 'Kolguyev DX Lane, Junction City, OR 97448, S791.11X HEI9MX, Strahleggweg 28, CH-8400 Winterthur, Swfterland, Group for planning international USA. The proposed expedition to VPOON Donald Betts, 7 Jeremy Maxi) Av. Stanley, Falkland is. Malpelo Is which was earlier S.Attantic. dxpeditions. Mike invites sugges- 7J1A8 United States Embassy. lelD Box 9041, Riyadh 11413, Saudi tions for places to visit next year. believed to have been postponed Arable. His address is in QTH Corner. until next year may now happen 708AA F8EXV, 4 Impasse du Doyen Henri Vial°, F-33400 Talerice, at the end of this month. Y90ANT France. WASPY via WA4WTG, 718 SE 3rd Lane. Dania, Fla 33004,USA. is located at George Foster Base, 9X5H0 PO Box 420. Kigali. Rwanda. Antarctica and will be there until David Dillon, G6QQ, will be the end of the year. He invites V2/G600 from Antigua from 14 CW skeds five or ten kHz above now indicates their location - ES1 licensed amateurs there who are October to 7 November and will the low ends of the bands and is Tallin and the Northern Islands; likely to use it. There has been no be on the air mostly on 21MHz uses 3.790, 14.290, 21.290, and ES2 Harju Rajon; ES3 Haapsala further news of the large group of CW. He hopes to take part in the 28.490MHz on SSB. HFOPOL, in and Paide; ES4 Kohtla-Jarve, Indians who were hoping to visit RSGB 21MHz CW and CO WW the S.Shetlands is very active Sillamae, Rakvere, and Narva: Bhutan this autumn. In view of SSB DX contests. He will keep between 1500 and 1800 near ES5 Turtu, Jogeva, and Polva; VK9NS's experience this seems regular skeds with G3FJV on 21.260MHz, and on 7_060 or ES6 Valga and Vorv; ES7 rather unlikely to happen anyway. Mondays and Thursdays at 0800 7.084MHz after 2200. FD1MRP Viljandi; ES8 Farnu; ES9 special JARL News reports the coming on 21.403MHz commencing 25 will be in French Guyana for event stations, and ESO Western into service of a second Japa- October, and will work callers three years and has the callsign Islands. nese 29MHz FM repeater - this after this. KA3DBN will be in FY4FP. He is on CW only on DX News Sheet reports that time located on Hokkaido. It's Anguilla between 1 and 8 14.017, 21.017, and 28.017MHz H44AP in the Solomon Is has callsign is JP8YCV, and frequen- October and has the callsign according to DX-NL, but also 15 been found near 18.130MHz cies 29.550MHz (input) and VP2EBN. to 30kHz above the low ends of between 1130 and 1230, and is 29.650MHz (output). The first, The group which is visiting the CW bands on 14, 21, and also often near 14.200MHz JP1YEE, came on the air in 1985 &Georgia and S.Sandwich next 18MHz according to the Long between 0800 and 1100. T3OAC from Ogasawa and has been month is in need of urgent Island DX Bulletin. is now in Fiji and has the callsign found to be very useful. contributions. Their immediate DL2GBT will be in Malta as 3D2WM. He will be there for three F6FYD will be in Sudan and target is US $12,500 as this 9H1XX until 21 October mainly years and prefers CW. Southern Sudan for several amount has to be paid as a using SSB on 14, 18, 21, 24, and DX News Sheet reports that months. It is not known if he will deposit to the owners of the ship 28MHz and possibly 7 and the call 7Z1AB has been issued be able to get permission to lmdioama for the thirty days it will 3.5MHz. The numeral in the to a station in the US Embassy in operate. 5V7HL is believed to be needed for the expedition (the callsigns of Estonian stations Riyadh. and that there are four have been a pirate but 5V7DP, in HF F-LAYER PROPAGATION PREDICTIONS FOR OCTOBER 1990

The time is represented vertically at two-hour intervals 00(00)GMT tor each band, ie 00=0000. 02.0200, 04-0400 etc. The probability of signals being heard is given on a 0 (indicated by a dot) to a 9 scale: the higher the number Ille greater the probability with 1 meaning 10 to 19 per cent ot days, and so on. Additionally 50MHz F-layer and 1.8MHz openings are indicated by a plus (+) sign in the 28 and 3.5MHz colums.

28MHz 24MHz 2IMHz I8MHz 14mHz i0MHz 7MHz 3.5MHz Timo / 000001111122 0000011111 22 000001111122 0000011111 22 000001111122 000001111122 0000011111 22 000001111122 / GMT 024680246802 024680248802 02 4 680248802 024680246802 024680246802 02468 0246802 024680246802 024880246802

44 EUROPE MOSC OW ...1 899872.. ... 3999994.. . . 899 99982 . t.. 888889942 533776668996 98754 4346899 87521111 3688 +42 44. MALTA .... 887773.. ... 29988861. . . .599999841 11. 888889973 753876678998 998744446899 9984211 24788 .45 4+. GIBRALTAR .. .576453...... 7887751. . . . 9 998983 . • ..298889971 441687778998 997864446899 998832223689 ++4.3 ICELAND 46541. 168774. . 48999 7 1 . .... 6889994. 22.1 87778984 884865556899 888832224678 +++3 35+ 48 ASIA OSAKA ...1 861 •. . 3 9 7 2 .58741. . .475432212 .152135655 .2. 4773 1551 22. HONGKONG _ 49+882 _ . . . 58E187 4 1 _ 27767751. 1 _ 55588742 2... 22236886 1 4786 1574 24. BANGKOK _ 8...+82 . . . 5 7 8889 5 . ...1 47879831 1... 25488953 4... .2136897 3 4788 I 1576 243 SINGAPORE . . . 5 7 811119 5 . - . 246879831 2...1 5468984 4.... 2136898 2 4787 1575 242 NEW DELHI . . 668 8 8 5 .1336678321 212.1 4468544 73...11 35888 73 4789 51 1577 2 244 74 1577 5 244 COLOMBOTEHERAN - 8...483 . . 8 7 7 8119 5 ; 1.2634679842 425412458975 8651..1 26899 973 4789 . . . 5 6 80 8 9 6 1 . 1.1 225679842 411.. 3458975 73....126899 71 4789 4 1577 244 BAHRAIN - 8+ ,43983 . . . 7 8 7 8 8 9 8 2 1 2.3533679853 525311458986 975. .126899 972 3789 74 1577 52 245 CYPRUS ...7++99961 . . 899 9 9 9 8 3 1 212908889963 634876788987 987843557999 998 1235899 8841.... 2688 +5 3.b.› ADEN - 8..899621 . . 7 6 613119114 2 423522579980 7453.. 358998 985.... 26999 973 3789 75 1567 52 235 44 OCEANIA SUVA/S 257721. . . . 4 7 8114 3 . .7787761. _ 27656872. _ 1 6532368. .52. .34. .2. 11. SUVAIL 2 _ 1.2432..374 . 4 8 5 3 1 . 6 7 5 23. 2776433852 .1387434583. ..2751.156.. ..2 . . I. WELLINGTON/S ... 68752I. . 1 7 88 64 3 . .38767761. - . 57556872. ... 65223672. WELL INGTON/L 21..1 . . 12 3. 1 1 2 1 . . . . 1 232452... 353 1236631.1552 _ 2651.1462. .1 . . 1. 151. 2 SYDNEY/S - 5988851. . . . 7 9 888 7 3 . . .. .68767872. - 475468841 - .1 52136861 SYDNEY/L 1 1 . . 4 2 1 . 5 4 12117421. 275 111 27432147 3 - . 252114761 3 PERTH . 7898051 . . . 6 8 B 88 7 4 1 . 1.1 306678742 2.1144458975 2...111 26897 4785 1572 24. HONOLULU3 . 1 . 2 5 1 . .311 572. .1.. 532.772. .2335311 64. .563. 31. .23. .1. 44 AFRICA SEYCHELLES ... 777874521 1.. 666886742 422323678986 7431.. 45899 8 972...1 26999 95 3789 82 1567 5 234 mAURITIUS - 78+899731 2.. 668889853 522433879987 843111 458999 962...1 26899 84 3789 61 1577 4 244 NAIROBI 1.. 787898852 31. 766689975 632632379998 8653..1 58999 9961... 26899 983 3788 761 1577 53 244 HARARE 2.. 677789864 41.768689986 752633379999 9744..1 58999 9961... 26899 984 3788 761 1477 53 244 CAPETOWN 21.477889975 53.676679997 882743358999 9846211 38999 9973.... 5899 985 3789 773 477 54 44 LAGOS 31. 3 985 53.586879997 872863238999 99584 .1 699 9 99971...4899 8994. 1889 6771 477 444 44 ASCE NSION Is 21.. 98777765 431298557887 873583224899 996771.. 2899 99984. - 699 89861.... 389 6773 87 454 34 DAKAR 11 _ 9..8+984 3311 97887996 774385325999 9968831. 3899 99985.... 699 88862.... 389 7673 157 444 24 LAS PALMAS .... 8+989851 11.. 99999972 331 398888998 664688778998 998875446899 99974211 3699 88852.... 378 +552 44 A' S. AMERICA 5th SHETLAND 11.. 37888874 3311 58887886 774477865688 88667544347 8 89985211.1 46 67862 13 3563 I .23 FALKLAND Is tt.. 58.8.874 331. 78876786 864386643588 887575421368 9998521... 37 89882 14 6873 2 354 R DE JANEIRO 11.. 39766782 221. 58855785 664277322588 8875751.. 389 999752.... 69 99862 37 7773 5 544 2 BUENOS AIRES .1.. 48+77873 221. 68886785 564287522378 8875753..16 8 999752.... 37 89882 5 7773 2 444 LIMA +8+872 it 2865874 343.24832257 67624441..27 8996521. .6 79862 3 5773 244 BOGOTA 1+87772 1 3885574 332.. 5632167 66521541 .38 9996321. .6 89863 4 6783 1 444 ea N. AMERICA BARBADOS 8+8+872 11. 8885884 343.27621387 6662454..18 8 9996521. . 38 98862 16 7763 4 543 JAMA/CA 1+87701 3875573 332.. 5642250 56412542 .37 9985421. .6 89863 3 6763 1 344 BERMUDA 6+88861 7876783 322.17843586 554135411 278 9984521. .48 88863 16 7773 3 444 NEW YORK 1888851 3887772 221.. 5864575 553.25442367 88734311.. 37 88863 15 5773 2 244 MEXICO 298751 487552 221. 2.574234 553.41451.1 5 79/35212. .2 59883 2773 .44 MONTREAL 288885. 3888872 22 .5865685 542.2545347 7 88734212.1 57 88863 25 6773 2 344 DENVER 5773. 68751 21 .188543 442.1. 255334 6862411 22.. 3 48863 2573 .24 LOS ANGELES 1862. 38741 11 57532 341.1. 56222 576241. 23 -1 27853 .473 4 VANC OUVER 351. 573. II 17742 331.1. 37543 575231. 25212 36853. .2 1363 3 FAIR BANKS 1 231. 1. . 1124631 22.. 32238753 554452126655 34653. .3322 .243. .11.

The provisional mean sunspot number for August 1990 issued by the Sunspot Index Data Centre, Brussels was 199.9. The maximum daily sunspot number was 295 on 20 August and the minimum was 120 on the 7 August. The predicted smoothed sunspot numbers for October, November and December were respectively: (classical method) 136, 134 and 132; (SIDC adjusted values 120, 119 and 116).

18 RADIO COMMUNICATION October 1990 SPECTRU M ANALYSIS

Togo is often in Snooky's Net on say how long this might last. TABLES AND 21.335MHz at 1800. 5V7RC has There was a major geomagnetic been heard on 21.295MHz storm in the last week of July but AWARDS around 1200. J5CVF is a new indices were otherwise low until VHF/UHF As those who have an entry in the station in Guinea-BIssau - he mid-August." David, G3ZPF, has Annual Table will know, Sicily, will stay until mid-December and taken me to task for my comment NORMAN FITCH G3FPK may visit the Bigajos Is sometime last month asking if the bands 40 Eskdale Gardens, Purley, Surrey IT9, may be counted as a country CR8 1 EZ for points although it is not a this month or in November. were really that bad. I was being FT4XG told G4DXW that FT4WB provocative - but the DX has recognized DXCC one. VHF on Crozet Is has a faulty certainly been there for those who Awards Manager lan Cornes, transmitter and is waiting for have been winkling it out. August offered a good selection G4OUT, has confirmed that IT9 is spares - hopefully these will arrive However, it is very clear that of modes to exploit including a valid country for RSGB awards, when the ship arrives this month. 28MHz has just not been as good several auroras, some good as noted in the current RSGB Call as some of us remember it being tropo, a few Sporadic E openings Book. Perhaps he can persuade during some previous sunspot on 144MHz and frequent events the ARRL to fall in line with the rest of Europe and accept it as a PROPAGATION maximum periods. At those times on 50MHz, and the Perseids it was possible to work very easily meteor stream. The latter seems country. The ARRL has accepted 5N QSLs for 50MHz DXCC Smithy, G8KG, has been moving with the proverbial "piece of wet to have been quite good this year. purposes; there was some doubt house and therefore rather limited string - but not this time... several contributors reporting about the licensing situation in his activity this month but he Thanks to DX'press (PA3CXC), good reflections. originally. says: "The shift in the pattern of DXNL (DL3RK), the Long Island solar activity reported last month Dx Bulletin (W2IYX), RSGB DX DXPEDITION has persisted and the average News Sheet (G4DY0). the Ex-G METEOR SCATTER level was again rising by the last Radio Club Bulletin (WA8GTA), RESULTS, week in August. Provisional daily and the Lynx DX Group Bulletin The major meteor stream in John Hotchkin, G4ATA (YSW), solar flux values were above 300 (EA2JGO). Closing date for October is the Orionids whose has sent the complete results of sfu on 22 and 23 August and the December issue is 25 October, parent body is comet Halley. It his August operation from The 27-day average rose above 200 and for January it will be 13 actually consists of four streams Lizard (CNUIN79JX). On VHF, he for the first time since January. November - which is ridiculously with periods ranging from 7.54 to operated between 10 and 16 Signs of a moderate recovery in early but not the fault of the 89.44 years and very retrograde August. For a single handed levels although it is too early to Editor! inclination orbits averaging about operation, he certainly put on a 163". At atmospheric encounter, good show from this rather rare the velocity is one of the highest, square. The equipment used was BAND REPORTS 68km/s. The British Meteor described in the August column. This month's contnbutors included G2HKU, GM3s CSM and GDX, G3s GVV, Society's Radiant Catalogue On 50MHz he made 60 KSH, LPS, YAM, 04s DXW, EHO. FRV. GW4KGR, G4s MUW, NXG/M, POO, gives the B stream a ZHR of 35. VVP. ZYO, and GOJZU. contacts with 14 countries in 36 Right Ascension 94.5' and Stations who were using CW are shown in Italics:- squares. On the 141h, 1916-2042, Declination +15.5'. he worked into Scandinavia via 7MHz The radiant of the Orionids is Es, best DX being OH5NO 2100 C56/0N7EH, 5V7RC above a mid-UK horizon from 2200 SU1CF (KP30). On the 161h, 1931-2205, about 2100. through midnight to 2300 FJM1ND there was a good opening to DL. 120OUTC. Reflection efficiencies OE and the Mediterranean; best 14MHz exceed 50% as follows: NE/SW 0500 HC8/14CILT DX was SV10E (KM17), and 9Hs 2300-0500; EiW 0130-0730; NW/ 0600 FK8FS, KH3/KB7HM, KHOAC.132Z, TI9US. 3D2KW 5AA, 5EX and 1PA (JM75). 0700 AH3C, FO5JV, H44AP, VK9NEI. ZKts OD, KY SE 0400-0930 and NiS 230°- 185 (DSOs were made on 0800 F0581, K8CRA4/14H3 0100 and 0600-1030. The period 144MHz with 17 countries in 42 0900 ZK2EA 19-24 October should provide 1600 JT1BG squares. On the 10th and 11th useful reflections, the peak 1800 V631K, 7Q7LA there was tropo propagation to 1900 KL7NAIK1-42. S79MX, ZS9A, 708M probably occurring on the 21st, northern Spain and Biscay, with 2300 A61AC. J5CVF although not necessarily very EA2AWD/MM (IN85) worked in a pronounced due to the combined 18MHz wet square. OL. ON and PA 0400 V31711 effects of the several streams and stations were contacted on tropo 0500 TA7/KUOJ their 'shallow' inclinations to the 1500 9V1YD on 10-12th. SSB MS skeds were ecliptic plane. 1600 S79MX completed with SP9EWU (J090), Another stream worth consid- 1800 F1-15EJ HG3DXC (JN96), YU2CV (JN95) 1 eoo 044BC, FY5FA, ZD8Z ering is the Taurids S which in a 30 second burst. IW1AZJ 2000 PAOGAM/ST2 TA2A0, 4S7WP, 6W1QJ peaks on 3 November, available 2100 A92BE, HL11UA. FV2AM, VP5/W2AH, VY2OST (JN35) and Y22IC (J063) on the 1730-0800. The RA/DEC are 50.5 2200 N7ET/DU7, V2/AA600, ZD8L11, 707CW 12/13th. On 430MHz he made 24 2300 V44KJ, 8R1/WICDC and +13.6' respectively, inclina- contacts with four countries and tion 5.5 - and period 3.00 years. 14 squares. He operated in the 21MHz Best times are: NE/SW 2000- 0600 T5RR. 708M contest on the 11th making 16 0100; ENV 2130-0330; NW/SE 0700 H44RW, JI2KLU/JD1 (M.Torishima), V63IN, ZK1KY OSOs. Best DX was ON5NY 0800 H44AP, KA3HMS/KH3, T2OAA, ZK1BY, 302/0Z1KLA, 9M8PV 0000-0530 and N/S 1900-2300 (J010) on the 10th. 0900 A350C.AH3C, BZ4UBC, XU8DX, 3D2YA and 0200-0600. Next month I will 1000 BZ4DOL, J28DN, ZK1KY John mentions all those who give data for the Leonids. 1100 BV5SY. SU1CF, T3OBC helped his solo effort by loaning 1200 VP2EY,YB8RB, UB4JW0/3W3RR, 9X5HG various items. These were the 1300 FT5XH, XX9KA 1400 BV2FA, ED9ICM. FR4FR, YC9VGB, ZS9A North Wakefield Radio Club, PHANTOM « Os 1500 D68KB, ZS8MI GOCVC, GOEVT, G4IAU, G7CCL 1600 A61AD, BZ7AA, XW8KPL. 9M8ST. 9V1RH and G8GXP. Although a little Responding to last month's item 1700 HSOILY. 9M2CS 9V1VC 1800 HFOPOL, V73AZ, 3X1SG 'mike shy', G7IDR assisted, and about the UB5KY/GW4FRX 1900 BV2DA, HS1BV, J5CVF, SOIA. V63IN Mr D Slicker transported the phantom auroral OSO on 13 2000 S92LB, VP2EY, 3V8/C31WW, 6W6JX equipment to and from the site March 1989, Jim Smith, G1DWQ 24MHz and helped assemble and (DOR) says he also received a 0700 9M2FS dismantle the stations. He thanks QSL from him for a non-OSO at 1200 S79MX, TR8BY all the sponsors who helped raise 2017 the same day. The only 1300 FT4X0, 5H3TW over £800 up to 22 August for the USSR station he worked was 1400 FS5E-i,V51130, VU2EMY 1900 707RM, 707G W, 9A42AX BBC's Children in Need appeal, UC2LAI. Colin Mister, GODAZ and particularly his understanding (HWR), is yet another who has 28MHz has not produced any exceptional dx this time so is being loft out to and supportive wife for letting him UB5KY's card for an imaginary make room for 18 and 24MHz. go. OSO in this event.

RADIO COMMUNICATION October 1990 19 SPECTRUM ANALYSIS

to the Memorial University ARC, repetitive, so this month I have (KM18). QS0s were made with PROPAGATION PO Box 51, St Johns, Newfound- compiled a chronological report of Z23J0 (KH52), 707RM (KH74), land, Canada A1C 5H3. activity based on input from the ZS6LN and ZS6WB. There was Trevor Day, G3ZYY (CNL), following contributors: Darrell strong TEP in Jersey. On the In Ray Cracknell's, G2AHU was active from Gibraltar from 22 Moody, GOHVQ (GLR); Neil Carr, 26th, CTI LN was copied at 1145 (HWR), July 50MHz propagation June to 12 July using his ZB2HN GOJHC (LNH); Jim Smith, and SVI AB and YO2IS (KNO5) and activity report there were call. He worked 135 British G1D WQ (DOR); Gerry Schoof, were worked in the morning. contributions from Cyprus, stations, 33 Ws and a VE, and his G1SVVH (MCH); Terry Chaplin, From 1800 ZBOT (IM76), CTI BH Zimbabwe, Greece and Japan, country tally was 24. He repaired G1UGH (SFK); John Heys, (IN51). GJ4ICD worked 707RM providing a comprehensive the ZB2VHF beacon and got it G3BDQ (SXE); John Hunter. at 1650 and Z23J0 was the account of events at this end of running again. G3IMV (BKS); Bryn Llewellyn, strongest signal Geoff has ever the VHF spectrum. There was Es FC1MKY informed Ted on 9 G4DEZ (ESX); G4UPS; Ela heard from Africa from 1700 for propagation from Britain through- August that his request for a Martyr. G6HKM (ESX); John half an hour. The LU1DMA out the month, the poorest days permit to operate in Monaco had Fitzgerald, G8XTJ (BKS); Gerard beacon was S5 in Jersey. being the 8th, 20th and 29-30th. been turned down. The club G140WA (LDR); Geoff The 28th provided Es and Ray commented: "The station in the principality has also Brown, GJ4ICD; John Hilton, auroral opportunities. The Es, increase in the number of been refused a permit. C31RM GM1ZVJ (LTH) and Paul Baker, 1140-1300 brought OEs in JN67, European stations permitted to wrote to G4XNS to say that no GW6VZW (GWT). 68, 76, 77 and 78, IK5FTQ operate on 50MHz tends to give a 50MHz permits have been issued Starting in July, on the 25th (JN52),10FDH (JN61),IK7GXR distorted impression and must be to Andorran residents nor are any there was Es propagation from (JN81) and DLs in J N58. YO21S set off against the incidence of being issued to visiting DXpedi- 1640-1830 to F, I, 9H, ZB2E0 was also QRV. Beacon GB3RMK transatlantic openings which this tionaries. By contrast Nick Waite, (IM76), SV1AB and SV1EN (1077) was auroral from 1500 to year have been, in the main, of G3KOX (H Fo), who operated short duration and very localized from the Azores earlier this year in extent. This year's results on with G3SDL, has received a LOCATOR SQUARES TABLE transatlantic circuits can only be 50MHz permit to operate in Starting date:1-1-1979 described as disappointing. Turkey. Mid-November is "Other longer distance circuits suggested as a likely time. Consign 50MHz 144/Aitz 4301/11la 1.3Gttz Total from Africa and South America Since about 9 July, someone G3IMV 305 438 125 51 919 opened on several days, mainly G.141CD 425 263 119 59 866 has been using a variety of exotic G41JE 366 338 5 2 711 to the extreme south and west callsigns on the band, such as G6HKM 263 224 112 48 647 which could be reached direct by KG6HA, KJ6HM, 9K2AM and GIRGK 121 311 145 52 629 F-layer propagation - by TEP or KH6GBZ. On 8 August he GODA2 137 316 122 ae 814 131 KOF 268 183 104 37 590 otherwise - and to the rest of the allocated himself 4Z4IF and G8HCV 309 233 542 British Isles with a final hop of Es. JYOA. Some may have been 1341(UX • 384 120 504 From the Midlands it was fooled into thinking they have G4TIF 172 204 111 487 apparent that these occurred G4XEN 66 300 114 6 486 worked a genuine station. The G4DEZ 110 249 eo 50 469 when stations in the south of obvious advice is to not waste G1SWH 196 165 60 6 427 France were also being received money sending OSLs and IRCs. G8DER 43 183 114 82 422 very strongly." John Ridd. G8BQX (SXE), is GOCUZ 348 73 421 416 The phenomenon of noctilu- G1DWO 284 152 one of many who has worked GOEVT 142 213 57 412 cent clouds has been mentioned EB5EIB (IM99UE). He sent a G8LHT 113 185 93 14 405 in VHF columns from time to time, copy of a QSL from him but as far 04MUT 122 153 94 34 403 it being queried if they can sustain G1LSEI 73 178 144 393 as we are aware, no Spanish GW6VZW 236 143 6 385 any form of VHF radio propaga- amateurs have any permit yet to 04P10 278 105 383 tion. Ray's report included details use 50MHz. Many are under- GOJ HC 328 48 '376 of a OSO at 2047 on 1 July 1989 standably incensed when G8ATK 74 144 94 384 380 during VHF NFD. Chris Tran. G4R RA 280 80 foreigners, who have 50MHz G4SSO 261 98 359 GM3W0J/P (I074NP) worked licences at home, operate from G4VXE 147 162 42 355 G4BVY/P (J001KK) on SSB with Spanish territories, including EA6 G4SWX 347 347 GM4YXI 340 340 RS55 reports each way while and EA8, when on holiday. G4DHF 331 331 beaming north at a prominent Membership of the UK Six G8PYP 183 112 34 329 noctilucent cloud. Metre Group has almost doubled GJ6TMM 109 151 52 312 No conventional aurora was since May and there are now GOGMB 187 99 286 G1GEY 170 92 22 284 apparent although there was an members in 38 countries. New G4YTL 249 - 249 auroral tone on the signals and on recruits include E198G, FC1MKY, 06ST1 - 152 69 24 245 the GB3SIX beacon. Ray II AMU, 0E5KE, OH2BC, GOHVO 173 71 244 G3FPK 244 244 commented: "NLC propagation OZ7DX, SM7AED, Y021S, 3W4 VEO . 241 241 seems improbable but anyone YU3ES, ZB2E0, ZS6XJ, 707RM GOLFF 83 163 236 with similar experience or who and six Ws. The Secretary is GW4FRX 232 232 can give details of any auroral G4UPS, 27 Parklands, Hemyock, GM4C XP 198 3; 229 GISMO 115 106 221 40S0 on the night of 1/7/89 is Devon, EX15 3RY: contact him GONFH 113 78 19 5-1 218 asked to comment, please." for details. G4DOL 218 218 John Livesey, GOJJL (LNH). is G6141XL 52 97 48 217 G8XTJ 101 121 222 50MHZ the editor of the group's newslet- G1TCH Se 95 8 200 ter called Six News and a copy of GMOGEI 193 193 INFORMATION issue number 26 arrived via Neil G1LIGH 101 89 190 Carr, GOJHC. It includes a G4X8F 172 172 Now some items from the August G1VVPF 20 114 37 171 'Beginner's Guide to MS Operat- 27 3 151 6m Information Pages supplied by G6MEN 87 54 ing', well illustrated details of a 2- GM1X0G 145 145 Ted Collins, G4UPS (DVN). The el. 50MHz beam, QSL informa- G4TOK 137 137 new Canadian beacon VO1MUN 121W4VVX 115 115 tion, a resume of Solar Cycle 22 (GN37) on 50.0375MHz is M O W- 88 23 111 so far and details on extending GM18VT 88 23 111 located at St Johns, Newfound- the coverage of the FT-690R G10EI 11 77 18 - 106 land and runs 10W from a home Mk 2 by SVI DH. M AYO 41 44 18 103 built TX to a vertical antenna, G7CLY 100 2 102 EIM1IVJ 35 48 46m AGL. The 20WPM FSK 83 06001 29 4; 76 message is "VVV de VO1MUN ORMHZ ACTIVITY GOHDZ 84 64 47.6N 52.7W AR." It has been OW7EVG 21 21 heard all over Europe and The usual method of individual No satellite, repeater or packet radio OS0a. reception reports should be sent reporting tends to be rather

20 RADIO COMMUNICATION October 1990 SPECTRUM ANALYSIS

0600 next morning and nine worked by many and LX1JX was EB1DMI/P, EA1CJF/P and 144-101113 countries were available by QRV. G4DEZ worked LUBYY0, EA1CJT/P (1N63), EA4SJ11 aurora. The second phase, 2300- the ZD8VHF beacon was S6 from Colin Morris, GOCUZ (WMD), has (1N83), EA2AWD/MM (1N74), 0020 in Dorset produced a visual 2127 for 35min and G4ODAJTF received a tape recording from EA2BFM/1 and EA1DVY/P event, too. There was Es to Iberia was contacted. HG5PT of the excellent Es (1N81). In a fleeting Es opening on the 30th and Z23J0 was S7 Many MS OSOs were reported opening to eastern Europe on 10 on 23 August, quite late in the for 20min from 1710. More Es on on the 12th at the peak of the July 1988 in which Tamas worked season, he worked IW1AZJ/1 the 31st around 1200 brought Perseids, countries worked about 100 Gs. If anyone would (JN35) and 1191P0/9 (JM78) 0E6s DGG and WHG (JN87) and including DL, HB9, HBO, I, 0E, like a copy, send Colin a cassette between 1912 and 1957. Peter from about 1800 some 9Hs. OZ, PA and SM. Es propagation with return postage and he will heard IW5BUX. During the SV1AB was worked at 1855. 10, was available, 0730-1300 to 1, LA, oblige; he is OTHR. Perseids. he got part of a call Y021S, SV1DH were QRV and ON, OZ, PA and SM and 2105- ?X4?? and wondered what that Colin worked IT9WGZ/9 CU1EZ (HM76) was worked at 2230 brought further Es to DL, could be. Any suggestions? (JM68) at 1750 in the Es opening 1812. 71D7RM and Z23J0 were 0E, OZ and SM. I2ADN/8 was on Andy Sillence, G4MYS (HPH), on 25 July. On 1 August, from also available. from JM79. reckons you don't necessarily 1645 he contacted EA6PS MS OSOs with DL and SM need ORO and big beams to Coming to August, on the 1st (JM19), EA3CSV (JNO1), EA7s in stations were reported in the work DX. He sent a copy of a 9H5AB was QRV at 0940, IM86/87 and ZBOT at 1800; the morning of the 13th. 0739-1050 QSL from 16JLO (JN62) worked followed by Es to F, I. OE and 9H Es faded by 1825. He operated in brought more Es to I2ADN/8, via Es on 14 July at 1947, from 1110-1240. 1540-1900, the long aurora on 28 July, best IT9CHIJ, IK5NTE. 9H5AA and confirming an FM OSO made with more Es to 1, 0E, OZ and SM. DX being SM1BSA (J097) and 1A0KM worked 105 stations in Y021S. OH3MF was worked at 45W to a colinear antenna at 42ft LA5JEA (J018). Gotaways were 1840. 0735-1100 on the 14th AGL; ORB is 1522km. about an hour; 0Y7FRA (IP62), UA2FL (K004) and ES2XM produced Es to DL, OZ, TF, T77C 0Y7ML, OHOBNP (KPOO), (K029). G4OUT operated on CW in the Y021S, Fs and DLs were worked. and Y021S; 1750-1801 to OH and aurora on 28/29 July. Ian worked He reckons this year's Around 1700, 707, Z23 and ZS6 OZ and 2055-2143 to DL, OZ and several GMs, G140WA (LDR). Perseids shower was the best came through. SM. El4CL (1063), GI4KIS (ATM) and since 1984 and he completed 25 On the 2nd at 0715, there was On the 16th there was Es to 1, SM5FRH between 1525 and QS0s. The best were G4DHF/TF Es to 9H and from 0840-1240 to 1, T77C and SM7 from 1830 and 0141. Stations heard included (IP03) on random SSB, TF3EJ LA, 0E, OH and SM. SM3BIU I2ADN/8 was worked in JM88 at SM1BSA, LA, SP3 and LY. The (HP94) on CW, IN3TWX (JN56), (JP73) at 1412 and SV1DH at 2123. 9H5AA was worked at OTEs for the GMs were 12-24°, OH5LK (KP30) and SM2CKR 1545 were worked. From 1650 0845 next morning, while on the the El/GI OSOs were at 348- (KP03) on the 12th and SM7EAN there was three hours of Es to 18th, FC1MKY (JN33) featured in 354'. The SM5 was best at 340° (J086) on Oland Island on SSB DL, 0E, OHO and OH, OZ and readers' lists. From 1224 there and quite inaudible east of north. on the 13th. He reckons the SM, also Y021S. At 1750, the was Es to OZ and SM and at In an aurora on 21 August, shower peaked at 1000-1200 on MUF exceeded 100MHz. 5B4CY 1940 9H1 BT was heard. On the Andy Cook, G4PIQ (ESX), the 12th. was S7 for 90min from 1905 and 20th Z23J0 was QRV at 1707 worked LA3NGA (J049), GB2XS G1DWQ heard EA6PZ and the CTOVVW beacon was copied and OH2SX (KP20) was worked (1078) and SM4KYN (J079). In from 2005. at 1932. several EA7s via Es on 1 August the good event on the 23rd he There was a tropo opening to but Jim failed to make any The latter was S9 at 0920 on worked GMs, including GMOGTU/ Scotland from the Midlands from contacts. On the 4th he worked the 3rd and GM, DL and SM were MM and on the 26th OH2T1 EA1WZ (IN53) at 2349 by tropo in worked 0948-1050. CU1EZ was 1300 on the 21st and G6HKM (KP20) and SM5ERR (J089). worked OY/G4ODA (IP62). The the EAJF contest. FF6KSL (JN28) available 1215-1400 then there Gotaways were ES2XM and and EI2VPX/P were new squares was a complete fadeout. On the 23rd was a rewarding day. LY2BJB. There was some good 4th there was Es to I, 9H, OH and Beacons ZB2VHF at 1115 and on the 5th. In the aurora on the N/S tropo on the 26th and Andy 23rd he worked GM4BYF and SM from 0845-0900. CU1EZ was CTOWW at 1230 were copied, contacted OZs and LA3NGA GMOLIR (1085) on CW around there from 1248 till fadeout at then from 1440 there was a good again. aurora to G. GD. GI and GM. At 1720 and heard GMOGTU/MM 1700. From 2115 there was Es to John Palfrey. G4XEN (NHM). 1614, auroral-E OSOs were (J007). I and OE and 4U1 TU at 2210 wrote that 1990 is the first year reported to SM7 and from 1720 was a choice DX station. During G1SWH made his first MS since he was licensed that he there was an Es opening to DL. F the afternoon, GJ4ICD reported OSOs in the Perseids. Gerry didn't have any Es OSOs in June. and I. The V51E keyer was S8 at propagation to Z23, ZS6, 707, SV completed on SSB with On 5 July. 1638-1710. he worked 2100 on the 25th and IT9CHU and 9H. G4DHF/TF, SK3LH (JP93), EA7s AH and PZ (IM67), EA1M0 was worked at 0754 on the 27th. The 5th brought morning Es to SM5FRH (J088) and LA1K (IN71). EA1CAI (1N72) EA4CM F, I and 9H. G3BDO worked (JP53). EA3KU (JNO0) was a new (INK) and EA4DLQ (IN79). The square for Cl UGH in the Es Z23J0 at 0828, a most unusual 701111111 next Es was on the 14th. 1930- time for this path. G4ODA/TF was event on 1 August, as was 2010 to Italy. EI2VPX/P on the 5th. On the worked from about 2030. ZC4MK Roger Banks, G4WND (SFD), The aurora on the 28th was in 26th. Terry worked OZ1BEF was copied at 0818 on the 6th, sent the August edition of his full swing when he came on at (J046). SM6KJX (J067), OZ7JR then OE and YO2IS. The V51E OSB The Newsletter for Four 1617. He worked SM1, OZ, SP2. keyer was there at 1700 as was Metres, the front page of which (J057). GOJDUMM (J014) on the 5 and 7, DL, El. GI. GM and GW oil rig supply ship Vulcan Service. Z23J0. 1845-1915 brought a carries comments on the and heard an LY2. The event was OZ5TG (J045) and OZ2BB short Es opening to 0E, DL, SV proposed new band plan. spectacularly visual at 2315 for (J046) by tropo. and YO. Feedback from his readers 15min when the rays were fading, ZC4MK was heard again at suggests opinions vary between, G3IMV's first OSO in the 28 leaving a greenish glow. On MS. 0835 on the 8th and from 1020 "A waste of time" and -About July aurora was at 1616 with G4YTUTF was John's 300th there were Fs. From 1629, the time." The main technical article SP4MPB (KNO3), followed by square and 48th country. It was a V51E keyer was copied via TER, is devoted to the Pye A200 series SP9AMH/P (K002) and SP7DCS 'tail end' CW OSO including a Es for 30min. DL. OE and F of amplifiers which can be (J091). By MS, John completed 21s, S9 burst and ranks as "OSO stations were worked from 1545 tweaked to give 50W of linear with LAOBY in JP67 and 68 in the of 1990." He thought the Perseids on the 9th and the V51E keyer amplification on 70MHz. Lofoten Islands, which are a good better this year with excellent was on again at 1745. From 1920 Only two reports this month, distance from Bletchley. reflections all day on 12 August there was three hours of Es to DL the first from G1SWH who Peter Atkins, G4DOL (DOR), and into the early hours of the and 0E. On the 10th, 1015-1315, worked EI2VPX/P (1061) in caught the 1 August Es to Spain 131h. there was Es to 1, DL, OE and SM Waterford on 4 August and and from 1707 worked EA3ADW G6HKM got an unexpected and ISOAGY was worked. There El9FK/P (1053) in County Mayo (JN11) and six EA7s in IM76, 78. new square on 26 July when she was a major solar flare at 1820. on the 11th. The other report was 86 and 87, the last contact being worked Andy. GWOKZGiMM on There was an extensive Es from Ian Cornes, G4OUT (SFD), at 1802. He operated in their the RRS Challenger in 1060. Ela opening on the 11th, 1330-1930 who operated from home in VHF contest on 5 August when tropo had a couple of OSOs in the 28 to CT. DL, HB9, 1, ISO, OE and NFD on 7 July to collect some was good to the south. Pick of the July aurora with GM1YZW (1068) OH. HBO/HB9Q0 (JN47) was counties in G, GI, GM and GW. bunch were EA2BWAJP (IN93). and GI4KIS (1064). In the Es on 1

RADIO COMMUNICATION October 1990 21 SPECTRU M ANALYSIS

August she worked six EA7s in 1M76, 77 and 87 and ZBOT for a ANNUAL VHF/UHF TABLE new country. 5 August brought January to December 1990 E12VPX/P and on the 26th she 50MHz 70MHz 144MHz 430MHs 1.30Hz Total worked several OZs. CaItsign Cty Cu Cty Ctr Cty Cty Cu Cty Ctr Points John Hill, G7CLY (HBS), G1SWH 51 33 32 6 85 18 41 8 12 5 289 G6HICM 59 34 87 22 34 13 27 10 266 contacted GB2XS at 0650 on 14 GOIMG 44 29 40 4 49 12 32 4 214 August. also E12VPX/P. He GONFH 40 20 21 3 ae 9 11 2 2 2 158 worked GMOLV1(TYS) and heard GOCUZ 88 31 30 6 155 1 WYC 18 18 53 14 25 134 G4P10/TF on 12 August. 04XEN 64 25 32 7 3 133 Greetings to Andy Smith. G7FWE G8PYP 22 1 1 42 13 21 6 • 129 (CHS) whose contribution got G8ESB 8 15 2 42 e 30 4 124 GW6VZW 77 120 squeezed out last month. He runs G8XTJ 13 57 13 107 10W from an FT-480R to a 10-el. GOEVT 21 38 14 S 100 Vagi at 45ft AGL. 03FPX 78 18 96 Graham Daubney. G8MBI G4OUT I 28 55 9 95 Git4OWA 29 43 14 93

(HFD), worked a couple of YUs G7CLY NI . 60 9 69 via Es at 1206 on 29 July. About GMOJOL 47 17 64 an hour later he heard YUs calling G6MXL 3 12 25 5 7 60 66001 35 e 15 • 80 CO for 3-4min. G8XTJ has been GMOGEI 29 22 51 working more WAS squares but GW7EVG 31 6 37 had no luck with the folk in °VD°. GM1ZVJ 9 2 1 13 John did get through to E12VPX/P British counties are those listed in the January 1990 RadCom. but excluding 10S; 77 in all. Up to three different stations allowed who always put an excellent • in all 12 GM regions. Do not include El counties. Countries are the usual DXCC ones plus IT9. signal into G3FPK's Rx, Darrell Mawhinney, GI4KSO John Nelson, GW4FRX (PWS), LA1YCA and LA8AK (J038), 1KLU and 20E and SMs 60E0 (DWN) worked ES2XM, ORB was QRV in the 23 August aurora LA9RAA and LA3EQ (J028), and 4KYN. She also worked 1916km, in the 29 July aurora for from 1526 to 1933 and his QTEs OZ1KLU (J046), LA3VW and some PAs. a new country. On 5 August he varied from 0-30'. Best DX were LA3DV (J048), DL3LAB (J044), completed on MS with G4DHF/TF LA4YGA (J048) and GMOGTU/ OZ20E and OZ6HY (J045). and thinks it a first GI/TF OSO on MM. He heard OH1CF and OZ1JPT (J064), SM6CEN/M and 1.30-HZ the band. Any prior claims? Other passed over G4DHF, not realizing SK6AB (J057), SM4JHK/4 G1SWH made his debut on the Perseids QS0s included till later that David was in OY on (J069), SM4KYN and SM4KRK band on 3 August. his first OSO SM2CEW (KP15), SM2ILF his way back from the Five Bells (J079), SM6JEH (J068), being with GlGEY (1094). On the (KPO4), SK3LH, plus DI_ EA, F. Group's Icelandic trip! Using 3W SM4DHN/4 (JP70), SM60EQ 8th Gerry worked GW3CCF HB9, 0E, OZ and Y. G140WA of SSB, Gary Nicholas, GW7EVG (J058), SM7LAD and OZ71S (1083) and on the 12th, found this year's Es very poor (CWD), worked G7IAC/P (NLD) (J065) and LA9DI (J059). GD4XUM/P and GIOGDP (1074), with only weak signals ever on 19 August, GM1NUS/M and G4ATA/P (IN79) was a new and GM4LBV (1075). G4XEN has reaching the province. However, GMOLAK/M (BDS) on the 26th. square for G1S WH on 11 August. sold all his 1.3GHz gear but John it was compensated by several He missed out on the auroras but G4MYS had a 20min OSO with hopes to be QRV again soon with good auroras. did OSO EI2VPX/P on the 7th. F2L0 on FM on 18 July; not bad better equipment and 10W. John Lincoln, GMOJOL (HLD), From Anglesey Tony Jones, just using a colinear antenna and Colin Roberts, G4ZFJ (ESX), is in 1078 and regularly QRV. GW4VEQ. heard 0Y6VHF for the at 270km, his best DX on the uses 10W to a 55-el. Vagi at 10m Recent CW MS completions first time via aurora on 27 July. In band in 10 years. Sheldon Hands, AGL. In just over a year he has include DL1GBF (JN48) on 27 the Es on 1 August he worked GW8ELR (DFD), took advantage worked 31 squares in 11 July, DL3RBH (JN68) on 3 EA7s in 1M76, 77 and 86 and on of sea ducting at 1056 on 11 July countries. August DX included August and SM2CEW on the 6th. the 4th. EA1WZ (1N53) by tropo. to work EA8/DJ30S (1L18). The DC8CE (J044) at 2059 on the In the 28 July aurora his best DX The tropo lift on the 5th brought German was S3 and Sheldon got 1st; DJ5J0 (J031) at 1954 and were 0K1 SL (J060) and EA1DKV, F6BQX/P (IN86) and S8. The path was open for two SM6ESG (J067) at 2030 on the GWOKZG/MM (J012). There was EI2VPX./P and on the 9th and hours on 430 and 144MHz. 2nd, SM6ESG again on the 4th at a 'local' aurora on the 15th but he 10th more EA1s in IN53. 63 and Dave Dibley. G4RGK (BKS), 0558, also copied on 2.32GHz; was too busy to stay on. 73. heard SP3RBF (J071) for quite a DB1BX (J032) at 2038 on the Doug Smillie, GM4DJS (SCD) Using SSB in the Perseids, he while on the morning of 13 July 12th and then worked on keeps magnetometer records and completed with Y27BL (J061) but couldn't raise him. In the 2.32GHz and OF7JS (J031) at found things very unsettled on the and EA3KU (JNO0) on the 11th, aurora on 21 August he worked 2056. plus the usual PAs. morning of 28 July with a series of and on the 12th with G4PIQ/TF, GMOHBK (1077) for a new square Beacons LA1UHG and LA3UHG storm pulses between 0530 and TF3EJ, IN3DOV (JN56), LAI K, and on the 26th. in another event, were heard almost continuously 0700. The radio aurora com- SM2ILF, HB9STI (JN46), IK1LGV he replied to Dave's CO call. He from 1 to 4 August but no menced at 1422 and continued till and 1K1JXY (JN44), HG7BT wishes those equipped for Norwegian activity. 1800. On CW he worked into DL, (KN17), and with FC1CCC (JN26) 430MHz would take a look on the G6HKM worked her best ever F, G, GI, GW and PA. The on random. band during auroras instead of 1.3GHz DX on 2 August, second phase was from 2020 to In an aurora on the 21st working the same stations time SM4KYN at 1193km, having 0500 on the 29th. Both the SMOERR (J089) and LA8SJ and again on 144MHz. He is worked Anders near the end of GB3LER and 0Y6VHF beacons (J059) were contacted. Pick of usually on 432.050MHz calling the 430MHz contest. Ela has yet were very strong; DLOPR and the crop in the 23 August aurora CO and not just in the stronger to work LA. She took part in the GB3VHF were also copied and were GMOGTU/MM, OY/G4DHF auroras. contest on 12 August when best he contacted stations in DL, El, F. Peter Burden, G4UBX (WMD), and SK6QW (J068) with DLs and DX was GD4XUM/P. G, GI and GM. is again QRV on the band with PAs. The aurora on the 26th The event on 23 August started brought OSOs with DL, LA, OZ 30W to an 88-el. Multibeam at 3m at 1405 till 1700, with a small and SM, the best DX being AGL. He transverls to the band DEADLINES second phase at 1858. Doug's SMOHAX (J099), SM1NVW using an ageing SOTA product The 144MHz Trophy Contest was CW reached OY/G4DHF (1P62), (..1097). LY2BJB and LA5JEA. and has worked 14 squares and SP7DCS. GMOGTU/MM and seven countries, including in full swing while this was being HB9DFG (JN37) plus Gs and GU3EJL (ALD), G4ATA/P (CNL) written but I believe conditions near continentals. GMOLVI could 430MHZ and E12VPB/P (1061). were not outstanding. Please get be heard on tropo as well so he G6HKM found conditions very your letters in by 25 October for was able to determine the Dop- Paul Brockett, G1LSB (LCN), good for the Scandinavian Activity the December and 22 November pler shift which was lkHz low. contacted OK5A/P (J070) on 21 Contest on 2 August. Ela's DX for the January issues. This indicated the reflecting zone July. In the lift on 2 August he did included LAs 8AK, 9RAA. 1YCA, was receding at about 2km/s. well across the North Sea to 3VW, 3DV, 9DI and 9JFA; OZs See page 65 for SWL News

22 RADIO COMMUNICATION October 1990 YAESU 757 GX ICOM R9000 & R7000 THIS MONTH'S SUPER DEALS An excellent small base station which Two fantastic multi-mode general doubles as a mobile, very popular with coverage rcvrs which the professional a bundle of features that compares and commercial users declare the FROM: with some of the bigger ones, best available, call for the leaflets if you feel you can't afford it you may like to frame the picture of the 9000. £ + BONUS £ + BONUS 0 ICOM 725 ICOM R72 A great deal in a small box and easy HF gen Coy Re, a real winner say the - T e c h, H i - S p e c, L o w C h e q u e Hi to use. DOS. band stacking, general SWL's and amateurs alike, 100dB coverage receiver with 10b dB dynamic range and Direct Feed Mixer for E R dynamic. 26 Mems, RX to 33 Mhz. call excellent Cross Mod reiection, includes for price and brochure. DOS which places it right at the top. SPE LLIRNE 0674-843 1 2 £ + BONUS £ + BONUS

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RADIO CO M MUNICATION October 1990 23 Waters & Stanton 0702 206835 BEST PRICES! FAST MAIL OR DER or 204965

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24 RADIO COMMUNICATION October 1990 See us at LEICESTER - STAND 815

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'MIMI 4111 •11 41 MI smaller. In the past year we have sold • 5/20/200 Waits' RMS or PEP • +1-5% IC-'-nale CM-M S* OrrJ.- 1 . IBM". more Jupiter handhelds than any other • I W Sensitivity • 50 O h ms • S0239 414 OM. en. model (and we stock virtually every 0.15dB loss s 155 x 63 x I o3min. model on the market!) Surprising perhaps «MD U M urn 1117.: MXt when you realise that it is a little more SX-600 1.8-525MHz £119

aus all» 11111M expensive than some models. But then 3INOSVNVd - "1111 •1111 there is nothing "cheap" about the I MO Ilan 0011111 Jupiter. Many owners are attracted by - si its superb sensitivity. Others are impressed

I ren-5000 MULTI u.m.,o RE-C[11111 1 by its internal construction (we delight in opening them up and showing customers the high standard of internal engineering). Everybody appreciates the simplicity of • 5/20/200 Watts • RMS or PEP • +/- 10% • Dual sensors • 1W Sensitivity • 50 operation, the lack of vices and our Ohms • S0239 • 0.2dB loss • 155 x 63 x excellent after sales service. Perhaps we 103mm. simply sell more because we happen to OTHERS have a lot of discerning customers who SX100 1.6-30MHz 30/3011/3k W £95.00 want the best. But whatever the reason, SX-400 140-525MHz 5/20/200W £79.00 SX-1000 1.8.1300MHz 5/20/200W £159.00 shouldn't you be taking a closer look at SX2000 Automatic 1.8-200MHz £89.00 the Jupiter range? We'll be delighted to SX9000 Automatic 1.8-1300Mflz £169.00 show them to you. More importantly, we know you'll be delighted when you buy DIAMOND AERIALS one. The Diamond "X" series of base station aerials are unsurpassed in their quality of construction and performance. Each one is dual band (2m & 70cm) fibre glass encapsu- ALINCO DR-110E FREE! lated, fully weatherproofed and packs Diamond 2m down into convenient lengths. Supplied 2M FM 45 Watts complete with all hardware and pre-tuned. 5/8th whip with • 144-146MHz Tx Rx every DR-1 10E X-50 2m 4.5d13: 70cm 7.2dB 1.7m £59.95 X-300 2m 6.5d13: 70cm 9dB 3. lin £89.00 Ends 16/10/90 • 130-169MHz Rx X-500 2m 8.3dB: 70cm 11.7dB 5.2m £129.00 • 4 Scanning modes X-700 2m 9.1.1B: 70cm 13dB 7.2m £195.00 • Reverse Repeater OTHERS CP221 2m base. Alloy 6.5dB £49.95 • 14 Memories 0130N 26-1300MHz Discone Tx/Rx £82.00 • Rotary Tuning Control E1.770H 2m/70cm mobile whip 3/5.5dB £30.00 • 6 Channel steps U790 2m/70ern mobile whip 4.5/7.2dB £39.00 NR72M 70cms mobile whip 5.5dB £24.00 • Mic. & Hardware inc. DP-211E 2m 1/4 wave whip £5.95 • Size 104 x 40 x 170mm M285 2m 5/8th whip £14.95 E1.2E 2m 7/Sib whip £32.95

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RADIO COMMUNICATION O cto b er 1990 25 o ICOM NEW MODELS

Designed for the serious operator on specific memory channels for satellite the 144,430 and 1200MHz bands, frequencies. loom's IC-970E has up-to-date The dual-band watch allows you to technology for DX, digital and receive both MAIN and SUB band satellite com munications. audio simultaneously, multiple Thr IC-970E is supplied as an all- scanning systems on the MAIN and mode dual-bander for 144 and SUB bands plus 99 memories, an easy 430MHz bands. Optional units expand to read central display and born's its capabilities to 1200MHz or DDS system makes this one of the wideband receiving from 50-905MHz. most comprehensive multi-band Com munication via satellites has transceivers available. never been easier, the IC-970E For more details on the IC-970E and auto matically tracks uplink and any other loom radio contact your downlink frequencies as the tuning local authorised dealer or call loom. control is rotated, there are also ten

Scorn (UK) Ltd. Dept RC, Sea Street, Herne Bay, Kent CT6 8LD. Tel: 0227 363859. 24 Hour. ;AT LEICESTER The IC-901 is a 2M/70cm. Dual-Band FM modular mobile featuring the versatility of upgrading to a multiband system with the addition of optional band units.

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unit other interesting stations • Basic 1-body style • Basic separate style can be heard. When the front panel and main body are combined the IC-901 operates as Dual-Band

transceiver. By using the fibre Supplied rernote controller cable optic cable the main body Remote controller and optional band units can • With optional band units • Separate Installation using an optical fibre cable Optional Band irols be easily boot mounted for Ophcal fibre coat° complete security, leaving only the remote head to control the transceiver;s functions on view.

This system is Ideal for the Optional OPtidod 7-7.vjà Ophonal EX-767 security conscious amateur EX-766 EX-766 and motorist where dash- Optional band units allow you 28. 50 and By connecting optional Interface units and 1200 MHz FM operation and 144 MHz SSB and an optical fiber cable, all band units can be board space is limited. CW operation. installed in the boot of your vehicle

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OPERATORS YES - BUT - but it is (or was) also basically a technical and scientific hobby held in high regard in profes- BASICALLY A TECHNICAL sional and regulatory circles, serving as a valu- HOBBY? TOPICS able form of self-training and contributing to the art of radio communication. WHEN HAM RADIOBEGAN publication in 1968 PAT HAWKER G3VA under the editorship of Jim Fisk. W1DTY. it [Reassuring news is that preliminary results rapidly showed itself to be a near-ideal source of of the RadCom Readers Survey indicate that useful technical information and ideas for all actually dug into the innards of a radio and made more technical articles (but simpler ones) are experimentally-minded amateurs. It introduced it work, the person who experimented with novel what is wanted by RSGB members - Ed] many ways of improving receivers, transmitters. antenna designs and new modes of communi- In this connection, I have been dismayed this antennas and simple test equipment for HF. cations in amateur radio, was becoming a smaller year to find the Science Reference and Informa- VHF and microwaves; not only constructional and smaller minority.. The technicians among tion Service Library off Chancery Lane, part of articles but also useful guidance on applied us no longer provide the numbers needed to the British Library, and formerly the Patents theory. propagation etc. support a monthly magazine of the calibre of Office Library, on which I have always depended It established itself as the only amateur radio HAM RADIO. Those who question that state- in the preparation of Ti'. has closed its files on periodical of standing that concentrated entirely ment need only examine the contents of OST virtually all the overseas and some UK Amateur on the technical and scientific side of the hobby. over the past few years as it relentlessly moves Radio and hobby-radio periodicals. For many devoting no space to contests, awards, band further away from its traditional role as a techni- years it has provided open-access to OST, HAM reports. social events etc. During its 22 years of cal journal, in response to the changing needs of RADIO, 73 Magazine, Amateur Radio (Australia), publication, HAM RADIO articles have been the its readers ... Let's get on with the world as it is, Short-Wave Magazine, Radio-REF and at vari- source of innumerable items in Technical Topics not as we'd like it to be. - Similarly CO's editor, ous periods CO, Electron (VERON), VHF - with Jim Fisk (until his death in 1981) and then Alan Dorhoffer, K2EEK writes: "Today's ama- Communications, ORV (Germany) all of which Rich Rosen always happy to see digests of HAM teurs are operator orientated and somewhat have now been discontinued at the Library - RADIO articles appearing on this side of the less technically geared ... in a shrinking techno- possibly also Radio-ZS although some 1990 Atlantic. logical society. Amateurs like things to remain issues are still appearing. Thus the closure of HAM RAD/Ofollowing the the same forever. Things change, people change Earlier this year. when this change of policy June 1990 issue is a matter of deep personal and most certainly the hobby has changed ... It was becoming evident, I wrote to the Head of regret but also, I feel, a sad reflection on the may not be what everyone likes or wants, but Technical Services at this famous library, stress- changing role of our hobby - from a basically this is reality." ing that many of these journals were of interest technical and scientific hobby recognized as Personally I find these opinions, while realis- to professional communications engineers as such in influential, regulatory circles moving tic, deeply depressing. I have always believed well as to hobbyists. In reply, EJ Copley wrote: increasingly in the direction of a purely fun hobby that the operator of a radio station (whether or for appliance operators. with little interest in the not it is composed entirely out of commercially- " The Library is in a difficult position in that it is seriously under funded and simply does not technology unless this arises from their profes- man ufactured equipment) can be - should be - have enough money to maintain the subscrip- sional work. keenly interested in the technology. Contests, tions to all its periodicals. Cancellations have Dick Ross. K2MGA, publisher of CO (which awards. DX -peditions. OSL cards etc were in- been, and continue to be, inevitable; we very has taken over unexpired subscriptions and tended to act as spurs to developing better, much regret that it is impossible to effect them which will in future feature articles by some of the more reliable, more portable/transportable low- without depriving one or other group of users of regular HAM RADIO contributors without adopt- cost equipment and enabling us to understand the titles they have grown used lo finding here. ing its technical-only approach) puts it thus: better the capabilities of the radio spectrum. lam impressed by your arguments in favour of "The true ham technician - the person who Yes. Amateur Radio is an interesting fun hobby the amateur radio periodicals and would like to reinstate them, but cannot - we cancelled them last year as an economy, and since then our financial position has deteriorated still further Li L2 The best I can say. and I am sorry it does not sound very promising, is that if things do im- C5 52 prove we will be glad to think again." 1010 C7 • C4 300p 3n0 = 2n0 vacuumiC6 vacuum So it would seem that Government parsimony 5kV 1YRe 300p type 10kV T5kV 3 kV will have to be blamed if Technical Topics ranges • less widely in future! A few years ago the idea of RFC1 RFC2 RFC6 4-3kV the British Library not taking such world-famous VI Ca C9 C10 C11 technical periodicals as OST would have been 4CX1000A 140p 500p 500p 500p unthinkable! Sic transit gloria . . . Eimac socket II0kV 115kV- j[20kV il- 20kV SK-810B plus chimney ln5 in ioRo3R ,,t 6,1 type '0004- knojtyPe ..._ +300V 5K-806B /•••••N socket 2W 51 '!' Air-flow C15 KN5S'S LOW-DRIVE, HIGH RF input C I o In° II It 1 f C16 e switch t t POWER LINEAR 100n R4 100n cm RI C3 220k IT HAS BEEN STRESSED before that the de- SOR T 1kV R7 60W 1 1 2W I disc cer 2W 10k sign and construction of a really high-power non- W fr in inductive linear amplifier calls for considerable technical RFC5 DI zOt 1N4148 1N473 expertise and care in view of the high-voltage R2 involved, coupled with the high-cost and vul- 1k0 disc cer 100V RFC4 6v2 2W R6 1mP. f sd nerability of modern valves and transistors ca- 911011 1k° Fit Volt s C13 154 RT1 2W pable of delivering large amounts of RF power. 1n0 Surgistor There is still much to be said for adopting the f t C12 50n valve rather than an all-solid-state approach. /7 204 Ti In CO (July 1990), Mark Mandelkern, KN5S Bias Ft 6V3 3A (a number of whose OST articles have previ- 104 ously been noted in TT) describes a powerful ii? Yac 4CX1000A tetrode amplifier (Fig 1). It is capable of delivering 1.5kW output throughout the range 1.8 to 50MHz with only 30W drive, almost all of which is absorbed in the 50 ohm grid resistor eliminating the need to match the input circuit or provide neutralization. In Class AB1, drive is only required to overcome circuit losses, usually Fig 1. The RF deck of KN5S's 1.5k W linear amplifier. This diagram is included in Technical Topics only to under a watt. show the basic approach adopted to obtain optimu m life of the valve and general reliability. Construction Clearly this American amplifier is designed for would recidire reference to the detailed articles in CO and OS T to include the bias and screen protection circuits incorporated in the power and switching sections. The feedback capacitors indicate the boundaries the US legal limit, runs well above the UK legal of the shielded grid compartments. limit and would not be cheap to construct.

213 RADIO COMMUNICATION October 1990 TECHNICAL TOPICS

Nevertheless the design features are of general rectified (lifting the DC voltage above ACrms) low drive should be avoided as it can produce interest even for amplifiers intended to be run at and monitored with an "expanded scale voltme- over 100mA negative screen current. Instead, considerably lower power. The July article is not ter" based on using a 1mA FSD meter in con- use a pulsed driving signal, for example using complete in itself. KN5S uses a 3kV HT supply junction with a 6.2V zener diode (1N473), read- dits from a keyer at 60WPM and full drive level, from a previous project and does not cover the ing approximately 5 to 6V (ACrms) with the always using a monitor scope. 300V screen supply which needs to incorporate heater sampling line connected directly to the Although many precautions need to be taken, adequate protection circuitry. Similarly, blower valve socket with its own feedthrough capacitor. in practice if this is done such an amplifier can cool-down delay circuitry, low-pass TVI filter and KN5S mentions that zener diodes behave rather give very reliable service. KN5S reports that his sequencing control for the antenna relay and strangely at low currents: "It may be necessary has given reliable service for 19 years under amplifier have been covered in HAM RADIO, to try diodes of different ratings from different very strenuous contest operating conditions. November 1987. page 17. The classic pi-net- manufactures. I obtained linearity from only 5.4 work output circuit uses two vacuum-capacitors to 6.0V, which is more than adequate for those and a roller inductor. who demand precision, an op-amp expanded ACID SPILLS CAN BE COSTLY A point worth noting is the care taken by KN5S scale metering circuit might be easier." The IN THE AUGUST TT, in introducing an item on to lengthen the life of his high-cost tetrode by meter scale does not need detailed calibration safety precautions to reduce hazards when reducing and monitoring the heater voltage. This since its purpose is to show whether heater handling lead-acid batteries. I recalled how I had topic was addressed earlier in Technical Topics voltage is above or below the chosen datum once accidentally damaged beyond repair a (June 1982) under the heading "Use and abuse point. The voltage can then be corrected by jacket when an old 2V accumulator tipped over of valves". Then it was noted that good filament means of a 25 ohm. 25W wirevvound adjustable undetected. An even more costly experience management is particularly important with high- resistor (R5) in the primary of the heater trans- recently befell Brian Davies. G30YU. This un- power directly-heated valves having thoriated former (this rating is for 117V AC mains. for 240V derlines the need to be ready to apply remedial tungsten filaments. However, it is not unimpor- mains the value may need to be increased). measures in double-quick time. He writes: tant even with indirectly-heated valves with ox- KN5S continues: "Rh. an in-rush current "Part of my business is setting up public address ide-coated cathodes, where the heater voltage limiter, provides gradual heater warm-up. Using systems. Many events do not have access to should be kept within at least 5% of the nominal a 6.3V, 10A transformer for a 6V. 9A tube lets mains power so batteries are normally used. I value as measured directly at the valve socket. you adjust the heater voltage by varying R5. use tractor batteries of about 95Ah capacity. I KN5S claims that, in his experience, for 6.0V It also allows for some drop in Rh 1 . . . The was transporting two of these in my E-registered nominal 5.7 to 5.8V have proved optimum with a required three minute warm-up period is pro- Saab 90001 and one rolled over when taking a three minute warm-up period achieved by using vided by a thermal delay relay in the bias using corner somewhat fast! I heard the noise and a thermal delay relay in the bias circuit. He warns a normally open three minute Amperite no stopped immediately. By the time I had climbed that failure to observe this warm-up time may 6N0180 tube. The bias control and delay tube out of the car, walked round to the back and destroy the valve. An air-flow sensor switch are located on the RF deck, while the circuit opened the boot, a quantity of battery acid had disconnects the screen voltage should the blower forms part of the control panel . . ." spilled out onto the floor of the boot and seeped fail to keep the cooling air flowing correctly. KN5S provides a detailed tuning-up proce- under the back seat. A Surgistor (GC25-933-S) is in the primary of dure emphasising the precautions needed with "I rushed home, not more than 15 minutes the filament transformer to reduce in-rush cur- high-gain tetrode amplifiers of this class. For drive, removed the boot floor and flushed out rent at switch-on. The AC heater voltage is diode example. he warns that tuning up key-down with everywhere with a strong solution of sodium

HEATER VOLTAGE 1N5406 2N4347 REGULATION DI 02 TRI IN THE KN5S AMPLIFIER, the heater volt- age is monitored with the aid of the ex- panded-scale voltmeter and then adjusted 03 04 o • Kj manually to cope with the appreciable volt- age variations that can occur on mains 1N 5406 2E)31N447 6V0 220V- 6A supplies - particularly if your house is well away from the HV line-transformer and o subject to wide variations in the load when, 1N4004 for example, a large number of domestic E>4 ovens are switched on. 8k2 k6 5 8C178 820R In 'Reflecties door PAOSE' (Electron, 500•C2 10k August 1990), Dick Rollema includes de- BYO--16V 2k2 tails of a stabiliser used by Leo Du ursma, 8C108 10k PAOLMD to stabilise the AC heater supply 4k7 to a 4CX250 amplifier requiring 6A at 6V (or 1N4148 a little under) (Fig 2). This automatically adjusts the AC supply voltage across the primary of the heater transformer which Flg 2. PAOLMD's AC regulator for stabilising the heater voltage applied to valves such as the 4CX 250. Note that the electronics of the regulator are not isolated from the mains supply and suitable precautions should has its secondary rated at 7V to compen- be taken. sate for voltage reduced by the action of the stabiliser. Note that the electronics of the stabiliser are not isolated from the mains z supply so suitable precautions should be A BY251 2 3300,,,-50v taken to avoid potential hazards. It would appear that such a stabiliser would be suitable for use also with amplifier valves requiring a stabilised heater-voltage at up to about 10A. BY 25f PAOLMD also draws attention to an ad- justable PSU (Fig 3) using the SOS L396 IC regulator. The DC output is adjustable from 5.1 to 15V with a maximum current of 4A (but note minimum load must exceed 100mA). The ripple voltage is less than 20mV. This could be useful for heater/ filament supplies with suitably-rated valves or as a general-purpose PSU. Fig 3. Variable DC PSU using L296 IC regulator. Output adjustable between 5.1 and 15V with maximum current 4A, minimum load 100mA.

RADIO COMMUNICATION October 1990 29 TECHNICAL TOPICS bicarbonate in order to neutralize the acid. This result in a permanent change to the value of the it did well, but not quickly enough. Much of the resistors. boot floor had soaked up enough acid to make a A low-cost form of multiband V-dipole which replacement necessary as the man-made fibre can be used with open-wire feeder and suitable covering the plywood had dissolved! The metal- ATU on 14, 18, 21, 24 and 30MHz stems from work beneath the boot floor and the spare wheel Maarten v.d. Velde. PA3BNT and appears in were saved, but the carpet under the back seat 'Reflecties door PAUSE' (Electron. August 1990) was not. It too was made of man-made fibre and (Fig 6). This broad band wire dipole uses a had dissolved. framework made from four 3m bamboo spread- "A couple of hours later I stood back to assess ers with a centre cross-piece. It could be used as the damage, rather more than I had expected. a fixed or rotary antenna. The local Saab agent quoted me for the replace- ment parts, a new boot floor plus rear carpet and IS IT REALLY ANCIENT labour for fitting. Nearly £600! "The point I want to make is that if acid is spilt, MODULATION? neutralizing it rapidly is critical: sodium bicar- THERE HAS BEEN RECENT correspondence bonate is cheap, easy to obtain and effective_ in both Practical Wireless and American jour- Fig 4. 18MHz bl-square array used by N4LBJ capable Have some available when the unthinkable may of reasonable performance on 14 and 28MHz bands. nals seeking to encourage more use of low happen and acid is spilt." N4LBJ considers it performs best when feedpoint power AM on some of the less crowded bands is about a quarter to a half wavelength above ground such as 1.8 and 28MHz or on VHF where it but adequate performance possible at lower heights, requires less spectrum than FM;NBFM trans- THE BISQUARE ARRAY down to about 310 5ft aboveground. Note that since missions. Over the years, this view has been REAPPEARS the array is voltage fed, care should be taken with echoed several times in Technical Topics and medium or high power that this does not represent there is still quite a bit of AM in use, for example RECENT TECHNICAL TOPICS ITEMS have a hazard to people or animals. described various forms of antennas using closed on 28MHz using low cost converted CB AM loops. But there is another approach in which the transceivers re-crystalled for the band. loop is open rather than closed, formed from two There is still much to be said in favour of "old full-wave sections bent to form a square with an fashioned" double sideband with carrier ampli- 9211- 3in insulator at the top junction, voltage-fed at the tude modulation. With high-level (anode or anode/ base with (600 ohm) open-wire or (450 ohm) screen) modulation of a power amplifier (calling ladder line (Fig 4). C Drayton Cooper. N4LBJ for an audio power about half that of the DC input (HAM RADIO, May 1990) shows that this old power to a Class C amplifier) it is much easier to favourite, dropped from most recent handbooks. achieve near "broadcast quality" transmissions known as a bi-square array, "works wonders on suitable for reception on any HF broadcast-type the new 17m band". receiver, without being limited by the use of 113ft - Sin Such an antenna is usually hung from a narrow SSB filters and the need for accurate single. high support to give vertical polarization. carrier re-insertion. There is no such thing as With a suitable ATU providing balanced output good quality SSB with amateur HF transceivers, to the transmission line, the whole system can at least by broadcast standards. 'Della-V' antenna AM lost popularity for a number of reasons: be resonated on several bands. N4LBJ finds his 50-8000 Leg 3-3 HWL transi or mer 18MHz bi-square works quite well also on 14 Frequency r 14-3MHz spectrum conservancy and reduction of hetero- and 21MHz. though gain and directivity will differ dynes on crowded HF bands (not that all SSB 50.0 somewhat to that on its design frequency. Be- coaxial cable transmissions keep within a 3kHz bandwidth!); a cause current flow reverses at the half-wave belief that much more effective use of power points, elements A and A' are in phase: similarly resulted from eliminating the carrier and one B and B' are in phase. The antenna thus oper- sideband: lower cost by eliminating the need for ates as four collinear elements in phase yielding a high power audio amplifier/modulator, etc. On about 4 to 5dBd gain on its design frequency with VHF. AM lingered longer but finally lost out to FM broadside directivity. It was originally derived in Fig 5. KLTISA's broadband Delta-V antenna in spite of its better "punch" mainly on grounds this form as a variant of the once-popular Lazy- optimised for 14MHz band. Requires a triangular of cost, greater tendency to cause EMC prob- H fixed array (I once had a Lazy-H on 28MHz (pie-shaped) area 104f1 by 93ft base. lems and the fact that RF bipolar power transis- and was delighted with the results). N4LBJ hung tors were not really suitable for coping with the his bi-square with two 53ft lengths of wire for a high peaks on the collectors (double the voltage full wavelength at 18.1MHz from a 65ft self- Nylon line bus). However voltage limitations are much less Bamboo spreaders are serious with power FETs than with the usual supporting metal tower. Although in the past 3m long b ears. AM and FM share the advantage over such antennas generally used wooden (non- Cross- conductive) masts, he did not find any obviously piece SSB that the power amplifier need not be linear, detrimental effects. Amateurs without such high permitting the use of more efficient Class C or D supports could probably accommodate a bi- stages (note that any further stage after AM square cut for 28 or 50MHz. modulation must of course be linear). It is easier There can be little doubt that the greater use to apply quite severe speech processing and now being made of the 18 and 24MHz "WARC" clipping to an AM signal than to SSB. bands is leading to a revival of interest in anten- For radio broadcasting. there are now various nas capable of working over more than a single (a) forms of high-efficiency AM systems, some band - for example the W8JK and 'BRD Zapper Rotator depending on novel use of digital techniques described last month. Another article in HAM and some developed from the old carrier-con- RADIO (May 1990) by Robert VViison KL7ISA trolled forms of transmission originally devel- covers "Non-resonant delta and V-beam Anten- oped in the 1930s. Open-wire feeder nas" including a design optimized for 14MHz While we would not recommend the use of that can be contained in an area 104ft by 93ft or AM on the main HF bands, it should be remem- so (Fig 5). He also introduces the concept of a tie bered that there is probably no easier piece of wire between the ends of the V wires, including equipment to build and get going satisfactorily the terminating resistor (he forms a single 800 (b) than a 1.8MHz AM rig, based on either still ohm non-inductive resistor by parallelling fifty available valves or F ET solid state. The main 39K. 2W carbon resistors soldered between two practical disadvantage is the low level of daylight parallel copper wires). This will cope with an activity on the band, often limited to the occa- average output power of some 200W since half sional local net at weekends. the power will be radiated before reaching the In the heyday of AM, some amateurs were resistor. SSB only cari be used at slightly higher Fig 6. Multl-band V-dipole for 14, 18, 21, 24 and proud of achieving "near broadcast quality" powers but excessive average power will quickly 28M Hz bands as used by PA3BNT. speech, significantly better than the "communi-

30 RADIO COMMUNICATION October 1990 TECHNICAL TOPICS

A USEFUL AUDIO AMPLIFIER IC - THE SGS TBA820M BOB ANDERSON, G4AEV draws atten- tion to - and sings the praises of - the SGS TBA820M audio power amplifier IC. In his case he has used this device successfully to repair an old but trusty FT101 tran- sceiver when its original (and now unob- Bypass VcC tainable) Sanyo STK-401 audio module Non-Inv input — — oc failed. He considers that the TBA820M Gncl Gnd provides an ideal replacement for the audio Grid — I— Gnd devices found in that generation of HF tran- Gnd — Gnd sceivers, listing its advantages as follows: Inv input — 1— nc (1) It requires only a single supply rail Grid — 1 7 8 Vout (upper limit 16V) and delivers over 1W Fig 9. Using the TBA820M with load connected to Non-ins input is connected internally (b) audio output from a 9V DC rail. the supply voltage. Capacitor C6 must be used to Gnd via a 150 k.t? resistor (2) Unlike many of the alternative avail- when high ripple rejection is required. able audio power ICs, the device is Fig 7. For applications requiring less gain than the happy feeding an earthed load, eg TBA820M, use of the LM380 audio output IC would headphones. be a suitable alternative. (b) Pin-ouf diagram for (3) It requires only 8 - 10 external resis- LM380. tors and capacitors (many of which were already on the PCB of his FT101 Mk 1). (4) It is cheap (only about 53p from Ra- diospares (RS) part number 30 2-491), and seems to work first time with no trace of instability. (5) With a 33 ohm resistor used for RF it gives some 45dB gain, into an 8 ohm load. For applications requiring less gain, the basically similar LM380 would be a suitable alternative (maximum fixed loop gain of about 34dB). The information shown in Figs 7-10 is taken from RS data sheets 2927, covering the LM380. TBA820M; dual (stereo) am- plifiers TDA2004; and the high quality monolithic audio amplifier TDA2030 ca- pable of providing some 21W output into a 4 ohm load. Fig 10 shows the use of the TBA820M as a 1.5W DC/DC converter. When used with a voltage doubler rectifier Fig 10. A 1.5W DC/DC converter (I about 40kHz this can provide up to 30V output from a Fig 9. (a) Using a TBAB201A audio output IC with using TBAB20M. Additional filtering and screening 12V supply. load connected to ground. Capacitor C6 must be may be advisable where RFI may be a problem. used when high ripple rejection is required. cations quality's speech heard today. restricted intense solar flares of February and October the peak in the sunspot cycle. So these two and processed to a bandwidth of 300 to 3000Hz. 1989. A recent 30 minute edition of the BBC's observations, for what they're worth. suggest I was recently reminded of good quality amateur "Science Now" (Radio 4) magazine programme that we have several years of potentially ex- AM transmissions, extending back to the 1930s, at the beginning of August was devoted entirely treme active conditions from the Sun ahead of in reviewing for another journal a new book to solar activity and some of its lesser known us." Broadcast Sound Technology by Michael Talbot- aspects, including the question of ozone deple- A particularly important result of solar flares is Smith. for many years Training Manager in Audio tion and the much more controversial question the permanent reduction in the power output of at the BBC Engineering Training Centre, pub- of the "Greenhouse Effect" on global climate, as the large solar arrays used to provide electrical lished by Butterworths (Library classification well as the better known effects on radiocommu- power for satellites. This is especially true of the 621.3893, ISBN 0-408-05442-5). This book nications. electricity power distribution, commu- usual silicon photovoltaic diodes. There would provides an unusually clear, understandable nications and weather satellites, space flight etc. be less degradation with gallium arsenide or and readable explanation as an introductory text Peter Evans interviewed a number of leading indium phosphide cells although these are con- on the whole field of acoustics and modern audio American radiophysicists on -the natural fire- siderably more difficult to manufacture. Cells are technology at a practical level - studio acoustics, work display we call a solar flare" with Joe Allen damaged by the high-energy particles radiated microphones. loudspeakers and virtually the making the point that "solar flares seem to peak from the Sun. To counter this, satellites intended gamut of modern audio technology without going a year or so after the sunspot peak. We think that to be parked in geostationary orbits for ten years into subjects too deeply or mathematically. A the current cycle is probably going to be the (eg weather satellites. DBS satellites. communi- book well worth seeking out and borrowing from second largest that has ever occurred in terms of cation satellites etc) are provided with arrays your local library even if this means asking them sunspot numbers and we think the smoothed which initially can generate more power than to obtain one for you from a central library. maximum will have been February 1990. There's necessary, calculated on the anticipated degra- A lot of sound common sense without the no question but that the higher flare activity in dation spread over ten years. However, the BBC excesses of much writing on hi-fi! 1989 is very much related to the rise towards the programme pointed out that during the severe maximum in solar activity. However, we've noted proton event of October 1989, the effect on the SOLAR FLARES - PROBLEMS over the last three previous solar cycles that the power panels in six days was the equivalent of flares seem to peak a year to a year and a half the calculated degradation averaged over live TO COME? later. .. satellite problems track the occurrence years! In other words it swallowed up half of the 77 NOTED LAST MONTH the problems that of major magnetic storms more than they do the total reserve power built into the satellites. As can arise from the magnetic storms and high- sunspot number ... I find a 2 to 3 and a half year one speaker put it: "It was extremely alarming to energy particle radiation associated with the lag of the greatest level of magnetic activity after see five years of ageing in almost as many

RADIO COMMUNICATION October 1990 31 TECHNIC M. TOPICS days." Apparently NASA and satellite designers In the camps. his sources of components got back to Alex he was promptly arrested by the have traditionally used a major proton event of were limited, often involving considerable inge- police as a deserter! August 1972 as a reference in the planning of nuity or risk. He once stole material from the space missions since this was the most intense camp commandant's office telephone while HERE AND THERE event that had been recorded in space. In prac- others distracted the attention of the office staff: IN THE AUGUST Technical Topics I suggested tice, the August 1972 event was equalled in capacitors were fashioned from Red Cross parcel wrongly that, even with conventional house wir- August 1989 and was exceeded for several tins, with the plates separated by the India paper days during October 1989. Back to the drawing from a bible. Crushed razor blades were made ing, a mains earth should not be directly con- board! into magnets which, with adapted tooth-powder nected to real earth. What I had meant to say was that mains neutral should never be con- High intensity particles also cause problems tins, were fashioned into earphones. He per- nected to real earth (or to mains earth). With to on-board computers and satellite electronics. suaded some guards to supply components in protective multiple earthing a real earth should A high energy proton particle or ion from a solar undercover black market trading deals and be spaced at least two metres from anything flare leaves a path of ionisation through the smuggled a receiver from Stalag Ito Stalag Ill connected to a mains earth. owing to the possi- satellite causing a "single event upset". Typi- hidden in a concertina which could still, after a bility of a serious hazard arising under fault cally, the faults can be overcome by ground fashion, be played. conditions (see -The Killing Ground - Earth Your control: " The operators are alert, they reload the In 1944 he is reported to have built a transmit- Station Safely" RadCom June 1987. pp 404-5). software, reconfigure the satellite and they keep ter (although there seems no evidence that this, Second, in my review of British Intelligence in going. although if they miss the upset the satel- or any other PoW camp transmitter, such as the the Second World War Vol IV (August, p38) I lite can be lost: "In the large events last year, one believed to have been built by G6SN, was twice referred to the BP decrypts of the SD satellites had these upsets ninety to a couple of ever used to effect secret two-way communica- (RSHA) hand coded traffic as lsosoles. This hundred times a day at the peak of the events." tion from a camp). In need of a power valve, one should have been lsosicle. Apologies. was located in an audio amplifier supplied by the Astronauts in Space Shuttle missions (which David Newark, AK7M in QST (July 1990) have tended to coincide with several larger flares) Swedish YMCA for the camp theatre. To cover reports that one of his PSUs emitted a noise that have reported seeing flashes caused by the the theft, the theatre was set on fire with a small sounded like line noise on an AM radio. Thinking response of the optic nerve to charged particles; time bomb. According to The Daily Telegraph, this might indicate a power transformer or in October 1989 they retired to an interior com- he left on the turntable a record of 't don't want to somesuch, he used a cardboard tube to locate partment. They discovered that for this level of set the world on fire. I just want to start a flame exactly where the noise was coming from. He event the shielding was not really adequate: in your heart.' Son of a London electrical engi- was puzzled to find the source was the bridge even though, at the relatively low Shuttle orbital neer, after the war he returned to the family rectifier components, more specifically the disc- height, high-energy particles are less of a prob- business but continued to devise gadgets. Two ceramic by-pass capacitors. He recalled a 1984 lem than at geostationary altitudes, during inter- of his secret radio sets - one concealed in a wind- QS T tip that the ceramic dielectrics of some planetary flight or, for example, on the surface of up gramophone, the other in a mess tin - are capacitors can exhibit piezoelectric properties, reported as being on display at the Hendon RAF the moon. Even at the heights reached by super- generating electricity when vibrated. Recogniz- sonic aircraft (such as Concorde) radiation lev- Museum. ing that piezoelectric effects often work both els during intense flares may reach 100 to 1000 In these days of microminiaturization we tend ways. he realized that his 0.01 pF, 1kV disc times background level, with dose levels the to forget how big, bulky, fragile - and out of date capacitors were acting as miniature piezo-elec- equivalent of several chest X-rays during a nor- - most pre-war (and even some post-war) mili- tric loudspeakers, emitting line noise transients mal flight. During a very large solar flare, as tary radio equipment could be, built to be carried as acoustical noise. much energy may be radiated in a few hours by reluctant mules [or camels, see RadCom He suggests that if your PSU. when plugged from a tiny area of the surface as is radiated from August 90, p9 - Ed]. A long, fascinating article into the mains, emits rather more ticking or the entire Sun in a second. published last year, 'A Polish Odyssey' by Lt Col buzzing than usual, this may not indicate a The Sun is, in effect, a superhot ball of gas C A Henn-Collins, Gt..15Z0 ( The Journal of The component fault, but a noisy. transient prone AC with a nuclear bomb at its core, radiating heat Royal Signals Institution, Summer 1989), de- supply mains. and light, with the outer layers of gas forever scribes, with a wealth of detail, how, as a young Following the final release of the controversial being churned over while the whole body inside lieutenant shortly before the outbreak of the war US Environmental Protection Agency (EPA) and out shows a complex pattern of rotations - a in September 1939. he was put in command of report that suggests that there is sufficient evi- natural dynamo over 1 million km in diameter, a detachment of Royal Signals intended to pro- dence to demonstrate a "significant" link be- ringing like a bell with sound waves being vide a radio link from the newly appointed British tween some rare forms of cancer and exposure bounced around and affecting the geometry of Military Mission, under General Carton de Wiart to extremely low frequency (eg 50 or 60 Hz) the whole body, with not one but several cycles VC, in Poland back to the War Office, and to electromagnetic fields near electricity power lines, inseparable from the complicated tangle of supplement the existing Foreign Office HF link. a Bill is being introduced in the US Congress magnetic fields that thread across the whole After several changes of plan, the detachment, proposing a $34m federal research programme surface. with crates and crates of equipment, finally left into the effects of electromagnetic radiation and Victoria Station on August 25. with the Army the setting up of an "Electric and Magnetic insisting that the party should travel to Poland RADIO UNDER PRESSURE Fields Research Advisory Committee" com- via Alexandria, Egypt. by train to the south of posed of representatives from Government, TT (eg JANUARY 1986, pp37-38) has previ- France, by boat to Egypt and thence via Greece industry and environmental organisations. Na- ously noted how secret radio receivers were to Romania. Over five tons of equipment in 80 ture (16 August 1990) reports this under the built and used under extremely difficult condi- boxes - much of it destined to be deliberately heading "Electromagnetic risk • All Aboard The tions in German and Japanese prisoner of war burned in a remote corner of Poland! Bandwagon." camps. Among the pre-war amateurs know to As a result by the time the unit actually reached Brian Hayes. G3JBU calls attention to the have built and concealed such receivers were Poland the country had been virtually over-run. "Powerbank Portable Power System" a 12V re- Ernest "Shack" Shackleton, G6SN, Tom However, when the crates were unpacked it was chargeable cordless powersource weighing Douglas. G3f3A. and Herb Dixon, ZL2B0 - but quickly apparent that the Army/RAF equipment 3.5kg in a distinctive carrying case for use with there appears to have been others who were not was unsuitable: "The SEE (Army Signals Ex- domestic appliances, fluorescent tent lights etc necessarily radio amateurs. periments Establishment) receiver was too noisy with a 60Wh capacity. G3JBU is pleased with An obituary in The Daily Telegraph (July 18, and unselective to copy the signal well enough the service he obtains with one of these units 1990. brought to my notice by Ray Herbert, for traffic handling. So in disgust I had someone although it is more expensive than a conven- G2KU,) of a wartime RAF sergeant wireless- throw it in the river." Christopher Henn-Collins tional lead/acid battery which he regards as operator/air-gunner. John Bristow, reveals how admits to wishing that he could have had the dangerous to use indoors. The leaflet he sent he built sets at three camps: Stalag Luft I. Ill and chance to bring along some of his amateur along gives no information on the type of cells VI, after escaping by parachute when his plane equipment - a feeling that was confirmed later used in the "Powerbank" - personally I suspect was shot down on August 13, 1940. This was when, after coming out of Poland, he stayed on these are the new generation of maintenance during a disastrous daylight bombing raid on a in Bucharest helping out with the civilian FO free "sealed" lead-acid batteries described in Luftwaffe base at Aalborg, Denmark, when radio links using an HRO and Comet Super Pro recent Technical Topics items (eg June 1990). eleven out of 12 Bristol Blenheim light bombers receiver. He built his own transmitter to establish The Powerbank units are available from some of failed to return. John Bristow was initially shel- a link with Cairo, grinding crystals with valve the larger d-i-y stores and certainly appear to be tered by a Danish doctor but insisted on giving grinding paste scrounged from the Minister's a convenient and safe source of portable power himself up when he learned that his host would chauffeur. These were much more effective than for camping. caravanning and boating - or for be shot if he was discovered. the military monstrosities. Later when he finally use with low power transceivers etc.

32 RADIO COMMUNICATION October 1990 LIstifcc.)

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RADIO COMMUNICATION October 1990 37 A Wideband Monitor Receiver for Top Band to Two Metres

Part one of a two part article by Ian Braithwaite, G4COL

THE RECEIVER described is designed to allow a radio amateur to listen to his own transmis- Sampling gate Audio amplifier sions, relatively cheaply. It can be used on any RF input band from 1.8 to 146MHz and no band switching Output amplifier is involved. Although I believe that all amateurs wish to Hold capacitor radiate signals of which they can be proud, a External listen round the bands shows that quite a num- oscillator 13.1 /17;/ ber leave a lot to be desired. Poor modulation PL Pulse Volume control quality on SSB [I], and drift, key clicks and chirp generator Headphones on CW can quite frequently be heard from trans- mitters ranging from the humblest to the most 5 to 5.1MHz 50 .to 51kHz sophisticated. If it were possible to hear these 4 VFO " I, defects at large distances, the amateur respon- sible could have detected them himself and set ÷100 Divider about curing the problem. That this has not happened may be due to the popularity of the transceiver, commercially produced or home- made. Provision of a separate monitor receiver may often be felt to be too costly. too difficult, or /111I both. I hope that this article will demonstrate that this need not be so. My design, a modified direct conversion re- ceiver, will demodulate CW and SSB signals and let you listen to your own voice quality or CW keying. To a limited extent, it will detect the presence of harmonics or spurii. I have also used it with a bridge to tune up antenna systems using very little radiated power by listening for a null. The receiver block diagram is shown in fig 1. It is very similar to a conventional direct conver- sion receiver, except for the mixer and local oscillator. Instead of a variable frequency oscil- lator (VFO) covering the receive frequency range of interest, a narrow range VFO signal is divided down to a relatively low frequency at which very narrow pulses are formed and applied to a diode sampling mixer. Radio frequency (RF) signals being monitored at the sampling mixer input mix with the oscillator pulses. Audio difference fre- quencies produced in the mixer are amplified and fed to headphones.

Above: Fig 1: Monitor receiver block diagram. Fig 2: Circuit diagram - signal generation section.

Left: The front panel layout of the reclever.

38 RADIO COMMUNICATION October 1990 MONITOR RX

CIRCUIT DESCRIPTION

The circuitry is shown in fig 2 (signal generation) and fig 3 (sampling mixer plus audio). In figure 2. Tri and Tr2 form a composite transistor Clapp oscillator. This covers about 5 to 5.1MHz and is capable of high stability such that, with care in construction, SSB transmissions on 2 metres (where oscillator drift is magnified nearly thirty times) can be monitored. Cl is a high quality air- spaced variable capacitor. D2 and Tr3 provide a stable supply voltage for the oscillator, and Tr3 also acts as a common base buffer amplif ier with an output sufficient to drive HC TTL device ICI. R8 and R9 bias the high impedance input to half the 5 volt supply rail supplied by regulator IC2. This is close to the switching point. ICI divides the VFO frequency by 100 and its output drives the pulse generator circuit which uses the NAND gates of IC3 as a crude monostable, the neces- sary delay given by R10 in conjunction with the Fig 3: Circuit diagram - sampling mixer and audio section input capacitance of IC3b. The output of IC3c is a train of very narrow negative-going spikes at a repetition rate around 50KHz. IC3d inverts to give positive pulses. Spectrum analyser meas- s ....sampling points urements showed the width of the pulses to be about 8 nanoseconds (1 nanosecond = 10' seconds). The sampling pulses are fed to the sampling gate of figure 3. Input Trifilar toroidal transformer Ti produces an- Output of sampler tiphase pulses which turn on Schottky diodes D3 Vau t and 04 together. When the diodes conduct, charge can be put on or withdrawn from hold 0 V capacitor C14 which thus stores a voltage pro- portional to the RF input waveform at the sam- (a) pling instant. The sampling process is illustrated in fig 4 which shows how beat frequencies can be generated. High beat frequencies are re- jected by a low-pass RC filter which follows the sampler. Audio frequencies are amplified by IC4 (gain x 100). and after the volume control, 105 Input provides an output suitable for driving head- phones with an impedance of as low as 4[1. Vout Headphones are far superior to a loudspeaker Output of sampler for monitoring as the latter could produce howl- 0 V 1 round with a microphone. Fig 5 shows how, by dividing the narrow range VFO signal, continuous coverage can be Low-pass filtered sampler output obtained above 2.5MHz, which is the 50th har- monic of the 50kHz signal fed to the sampler. OV since each harmonic is potentially capable of producing an audible beat note when mixed with the input signal. This comes about by using narrow local oscillator pulses.

Fig 4: Sampling action: a) Input waveform sampled at the same instant on each cycle. b) Sampling is non- . to be concluded. synchronous with input signal.

REFERENCES 2-350 2-397 N . 47 1) "Sideband slip-ups" by "Eavesdropper". RadComm, July & September 1988. 2-400 2-448 . 48 2) Solid State Design for the Radio Amateur by Hayward & DeMaw, ARRL. 2-450 2-499 N . 49 3) Radio Data Reference Book by G R Jessop, RSGB. ?-500 2-550 N = 50

2-550 2- 601 N = 51 N = Harmonic number Next month: Details of 2-600 2-652 N=52 constructing, testing and 2-650 using the monitor receiver, Including a full list of components. Fig 5: Frequency coverage obtained with a local oscillator covering 50 to 51kHz (5 to 5.1MHz divided by 100)

RADIO COMMUNICATION October 1990 39 KW COMMUNICATIONS LTD CHATHAM ROAD SANDLING MAIDSTONE ME14 3AY TEL: 0622-692773 762274 FAX: 0622-764614 TLX: 965834

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SSB/C W 12V 275.00 30MRK HF2V 30M Add on Kit 33.50 2.00 -2SE 2M FM Handportable with Nicad/charger TBR1606 160M Add on Kit for HF6 & HF2 64.48 3.00 -2SET 2M FM Handportable Keypad entry DTMF 295.00 SC3000 30-512MHz Scanner Vertical 63.99 4.00 -2CE 2M FM Handportable with Nicad/charger 265.00 2MCV 3dB 2M Connell, 53.99 3.00 -228E 2M FM Mobile 25W 20 Memo 12V 365.00 2MCVS 5dB 2M Colinear 63.99 300 -228H 2M FM Mobile 45W 20 Memo 12V 385.00 HF5B 5 Band Mini Beam 234.15 C-29013 2M SSB/Ffirt/C W 25W 5 Memo 12V 559.00 -275H 2M Transceiver SSB/FM/CW 100W 12V 1,039.00 -4SE 70CM FM Handportable inc Nicad/charger 310.00 C USH CR AFT (USA) C-4SET 70CM FM Handportable Keypad entry DTMF 310.00 124WB Cushcraft 124WB VHF Beam Anton 37.08 4.00 C-4 GE 70CM FM Handporlable inc Nicad/charger 299.00 153CD Cushcraft 15-3CD 3E1 25M Beam 140.06 8.00 C•R100 Wideband Receiver 499.00 154 CD Cushcraft 15-4CD 4E1 15M Beam 181.57 8.00 -R71E General Coverage Receiver 855.00 203CD Cushcraft 20-3CD 3E1 20M Beam 238.91 C-R1 Handportable Receiver 399.00 204CD Cushcraft 20-40CD 4E1 20M Beam 328.70 -AT 500 Automatic Antenna Tuner 500W 529.00 215WB Cushcraft 15E1 2M Vagi Antenna 98.99 8.00 4218XL 18 Element 2M Boomer 121.90 8.00 KE N WO O D NEW Transceiver 3,155.00 A3SS Cushcraft 3 Ele Tribander SS 324.02 TS950SD 1,995.00 A45 Cushcraft 4 Ele Beam Antenna 391.95 TS940S 9 Band TX General Cover AX 244.88 A50-6 Cushcraft 6M 6 Ele Beam Antenna 182.51 8.00 AT940 Auto/ATU TS140 HF 9 Band General Cover TX/AX 862.00 APB 8 Band Vertical 164.76 8.00 985.00 ARX2B Cushcraft VHF Vertical Antenna 45.59 3.00 TS6805 HF/6M TX General Cover AX 1,138.81 ARX4505 Cushcraft VHF Beam 42.84 3.00 15440 9 Band TX General Cover RX PS50 222.49 AV3 Cushcraft AV3 Trapped Vert Ant 75.00 8.00 H/Duty PSU AV5 Cushcraft AV5 Trapped Vert Ant 151.80 8.00 A1230 All Band ATLUPowermeter 208.67 238.00 DW3 10, 15 & 20M Diet:era 159.01 4.00 TH25 NEW 2M H/Held 269.00 D3W 10, 12 & 17M Dipole 159.01 4.00 TH45 NEW 70cm H/Held LAC1 Cushcralt Lightning Arrestor 6.58 1.00 TH75 NEW 2m/70cm H/Held 398.00 215.26 LAC2 Cushcraft Lightning Arrestor 6.58 1.00 TH205 2M H/Held 252.13 R45K R4 to R5 Conversion Kit 35.01 4.00 TH215 2M H/Held Keyboard TR751 2M 25W M/M Mobile 599.00 R5 Cushcraft yz Wave Von 10-20M 259.01 F12000 599.00 10143 3 Element Monobander 115.03 4.00 General Coverage HF/AX A3WS Cushcraft 3Ele 18/24MHz Vagi 246.87 R5000 General Coverage HE/AX 875.00 TM 701 NEW 2M/70cm FM Mobile 469.00 TM21 2M/70cm FM Mobile 675.00 TM231E NEW 2M FM Mobile 50/10/5W 289.00 M FJ (USA) TM431E NEW 70cm FM Mobile 35/10/5W 318.00 MFJ1274 Packet Radio Terininai 204.25 3.00 mF..11278 Multi Mode Data Controller 228.49 3.00 TE N TE C MF.116010 Random Wire Tuner 45.08 2.50 TT562 Omni V HF Transceiver CW/SSB/FM 200 9 bands 1.900.18 MF..11701 6-way Antenna Switch 39.30 2.00 TT585 Paragon General Coverage HF Transceiver 2GOW 1.839.00 MFJ1704 4 Position Ant Switch 66.41 2.50 TT961 Power Supply for Omni. Paragon 215.00 MFJ202B RF Noise Bridge 63.20 2.00 TT282 6.3MHz 250Hz Filler 60.00 2.00 MFJ204B Antenna Noise Bridge 84.31 2 00 TT285 6.3MHz 500Hz Filler 60.00 2.00 MFJ250 1KW Dummy Load 56.21 3 5G TT288 6.3MHz 1800Hz Filter 60.00 2.00 MFJ260 300W Dummy Load 32.57 200 111140 Circuit Breaker 16.00 2.00 MFJ40113 Econo Keyer Kit 59.21 3.00 TT217 9.0MHz 500Hz Filter 60.00 2.00 MFJ407B Electronic Keyer 78.73 3.00 11218 9.0MHz 1800Hz Filter 60.00 2.00 MFJ422B Electronic Morse Key Bencher 146.25 3 00 TT219 9.0MHz 250Hz Filler 60.00 2.00 MFJ422BX Electronic Morse Keyer W/O Bencher 76.46 3.00 TT256 FM Transceiver Module for Omni & Paragon 60.49 2.50 MFJ482B Grandmaster Memory Keyer 92.77 3.00 TT257 Voice Synthesiser for Omni & Paragon 78.09 2.00 MFJ484C Grandmaster Memory Keyer 162.32 3.00 11259 Universal ALC Annunciator 78.00 2.00 MFJ722 CW/SSB Filter 76.46 2.50 11220 9.0MHz 2.4KHz Filler 60.00 200 MFJ723 C/W Filter 48.54 2.50 11425E Titan Linear 1 5KW 160-10M 2,171.00 MFJ752C Tunable Filter 104.42 3.00 TT420 Hercules II 500W Solid State 160-10M 839.00 MFJ815 SWR Meter 2KW 78.74 2.50 119420 Hercules II Power Supply 100A 13.8V 660.00 MFJ1340 2M Wattmeter 21.02 2.00 TT7DOC Ten Tee Electret Hand Microphone 32.00 2 00 MFJE141 2M In-line Wattmeter 42.14 2.00 TT705 Ten Tee Electret Desk Microphone 65.00 2 (10 MFJ901B 200 Wall ATU 70.05 2.50 11233 Ten Toe ATU 2.0KW match 160M-10M 361.69 MFJ910 Mobile Matcher 22.30 2.50 11254 Ten Toc ATU 200W 'T' match 160M-10M 153.33 3.50 MFJ931 Artificial Ground 86.61 3.50 MFJ941D 300 Watt Basic Tuner 105.40 3.50 YAES U 2,995.00 MFJ945C Versa Tuner 11 Mobile 97.37 3.50 FT1000 HF Transceiver General Coverage Receiver 1,599.00 mFJ9490 De Luxe 300W ATU 168.82 3.50 F1767 HF Transceiver MFJ96213/C 1.5KW ATU 258.84 FT747GX Budget HF Transceiver 659.00 969.00 MFJ986 1.5K W Roller Inductor Tuner 279.62 FT757GX Mk11 HF Transceiver MFJ989C 3KW Roller Inductor Tuner 368.17 FP700 20A P.S.U. 219.00 FC700 Manual ATU 149.00 3.00 FP757HD Heavy Duty 2M P.S.U. 258.75 F14700 NEW 2M/70cm Dual Band FM Mobile 675.00 LO ADS & SWITC HES FT290 Mkt1 Super 290 2M Multimode 2.5W 429.00 T35 Toyo 30W 1-500MHz Dum my Load 10.20 2 00 FT690 Mklt 6M M/Mode 2.5W 399.00 T100 Toyo 100W 1-500MHz Dummy Load 45.00 200 FT411 NEW 2M H/Held Keyboard 225.00 T200 Toyo 200W 1-500MHz Dum my Load 64.00 2.00 FT811 NEW 70cm H/Held Keyboard 239.00 DL1 Texpro 1.5KW 160-10M Dum my Load 75.00 200 FT470 NEW 2M/70cm Dual Band 389.00 KS2 Koyo Coaxial Switch 2 way 1.0KW 28.89 2.00 FT23FI 2M Mini Fl/Held 209.00 S2ON Koyo Coaxial Switch 2 way 1.0KW 1-1000MHz'N' 32.86 2.00 FT73R 70cm Mini H/Held 229.00 SA450M ToyoCoaxial Switch 2 way 2.5KW 1-500MHz S0239 18.50 2 00 FNB9 Nicad Battery Pack (23/73) 34.50 2.00 SA450N Toyo Coaxial Switch 2 way 2.5KW 1-500MHz 'N' 26.00 2.00 FRG9600M 60-980MHz Scanning Rx 509.00 DRAE UHF UHF 3 position Antenna Switch 'N' 24.15 2.50 FRG8800 HF Receiver 649.00 DRAE VHF VHF 3 position Antenna Switch S0239' 18.69 2.50 F1736 2/70cm 25W Hase Station 1,359.00 FL3035 25W Linear 115.00 3.00 VS WR/P WR METER S R OTATORS W160 Koyo 15/60W 2M In-Line VSWR/ 32.91 2.00 AR40 Hy Gain for up 10 3so 11 wind load 186.67 W544 Koyo 7/40/400W 140-460MHz 107.00 2.00 CD4511 Hy Can for up to 8.5sq II wind load 236.80 374.44 W560M Koyo 3/20/200 1.8-520MHz 99.90 2.00 HAM4 Hy Gain lor up to 15sq It wind load 460.23 W570 Key() 5/20/200 1 8-1300MHz 124,75 200 T2X Hy Gain lor up to 20sq fit wind load K20 Koyo 15/50W 2M 24.50 2.00 2303 Sky King Light Duty Rotator 40.99 4.50 K100 Koyo 2KW 1 8-60MHz 79.98 2.00 G400FIC Yaesu Round 360° metre 169.00 5.00 219.00 K200 Koyo 200W 1.8-60MHz 61.55 2.00 G60ORC Yaesu Round 360° 5.00 K400 Koyo 200W 140-525MHz 63.65 2.00 AR200XL Olfset lead unit, 3 wire, rotary dial control 49.50 4.00 Yaesu twist and switch control 78.00 YM1E Toyo 120W 3.5-1500MHz 32.00 2.00 G250 T435 Toyo 200W 2M & 70cm VSWR/Wallmeter 67.77 2.00 KS050 Kenpro Stay Bearing 19.95 4.00 GC036 Yaesu Rotator lower mast clamp 16.95 4.00

If you don't see it please ask, we have over 1000 items in stock. We are located just off the Eastern side of the A229, between jct 3, M2 and jct 6, M20. Follow the signs to SANDLING.

Instant credit available OPEN TUES -SAT 9.00-5.00 STOCK ITEMS USUALLY OELIVERY/INSURANCE PRICES VISA Mail/Telephone order by cheque of (CLOSED MONDAYS) DESPATCHEC WITHIN 24HRS MAINLAND ONLY credit card IE & 0E)

40 RADIO COMMUNICATION October 1990 A Simple 70/144MHz Diplexer

THE DESIGN of this diplexer was prompted by good electrical contact with the tuning screws, the wish to be operational on both 70MHz and causing erratic variations in output power as the 144MHz without having to erect two separate Dr LC Waring, GI3WUO, bolts were adjusted. The only cure for this is to external aerials, or switch cables frequently shows how to avoid putting select anchor nuts which are in good condition between two transceivers. A 144MHz colinear and to replace any which exhibit this problem. antenna was to be used for troth bands. The up an extra aerial to get on colinear has a rather high VSWR of about 2.5 on the increasingly popular ALIGN MENT 70MHz, while on 144MHz the VSWR is less than For initial tuning a dummy load is connected to 1.2. The requirement was for the minimum sig- 70MHz band the output of the diplexer. It was found useful first nal loss in the unit, rather than a high degree of to connect a VSWR meter between the transmit- isolation. Overcoupled tuned circuits were ter and the appropriate filter section and adjust employed to ensure minimum signal attenuation the tuning screws for minimum VSWR. and provide a flat response over the amateur the 70MHz coils fourteen turns, all of V.in inter- When the filters have been pre-tuned in this band to be used. -The overcoupling also pro- nal diameter. The tap positions were at 2/, turn for vided a degree of matching on the 70MHz band. way, both transmitters are connected and the 144MHz and 1 for 70MHz. The coils were power meter placed between diplexer and made from 14SWG wire for the 144MHz section dummy load. The power delivered to the load is DESIGN and 16SWG for 70MHz. The exact gauge of wire separately maximised for each transmitter by used is not critical, but if thin wire is used the coils The starting point for the design was the band adjustment of the appropriate tuning screws. will be susceptible to vibration, which will induce pass filler described in the RSGB VHF/UHF All tuning should be done with the lid of the amplitude modulation on both transmitted and Manual p.7.2, Fig 6. In principle two of these box bolted in position. The adjustments of each received signals. filters would suffice, one for each transceiver, filter section interact strongly with one another, Construction of the diplexer is straightfor- except that each filter would appear to the other and repeated tuning is necessary to find the ward. The coils are assembled and the earth as a short-circuit across the aerial. This problem optimum positions. There is also slight interac- ends connected to tags on the inside of the can be overcome with the configuration of Fig 1, tion with the settings of the filter section for the diecast box. The other ends are soldered to in which each filter section presents a high im- other band, so the tuning of each side may have ceramic stand off insulators, which also hold the pedance at the operating frequency of the other. to be repeated a few times. fixed discs of the tuning capacitors. Final tuning must be done using the aerial, The only difficulty encountered was the as- since the tuning points of the coils are affected sembly of the variable tuning capacitors. The by the impedance of the aerial. best approach was found to be as follows (see Fig 2). Screw the tuning bolts fully into the TEST RESULTS anchor nuts. Screw a 2BA nut onto the end of each bolt and adjust until the length of the screw projecting past the nut is equal to the thickness o

of the one-inch brass discs. A hole of —3 diameter, to suit 2BA, is drilled in the centre of 6 each brass disc, then the centre of each disc and the ends of each of the tuning bolts is lightly o 9 tinned. The tuning screw head is then firmly

clamped in a vice with the end of the bolt up- 15 144 PAH :—. \ \F'LTER Fig 1: Recommended configuration wards. The brass disc is placed on the end of the 18 screw, supported by the nut, ensuring that the 21 The degree to which the aerial is coupled to disc is at right-angles to the screw. The disc is 110 170 130 140 150 160 170 each of the two filter circuits can be altered by then soldered in position and all four bolted in Freq ency (MHz) changing the inductances of the two sections A position in the box. and B. Section A controls the coupling to the o 144MHz circuit and is about half a turn up the coil. The coupling to the 70MHz circuit is deter- —3 70Mhiz FILTER mined by the sum of the inductances of the 6 sections A and B, and may be adjusted by ID 9 altering the length of B. &, 12 A problem was the choice of tuning capacitors 15 in view of the high voltages developed in the filter when transmitting. Initially, small variable ca- 18 pacitors with solid dielectric were tried, but these 21 40 50 60 70 80 were destroyed by a few watts of RF. Air-spaced Wall of Frequency (MHz) trimmers were then substituted, but these tended box to arc over on transmit as soon as the circuits Stand-oft 2BA nut soldered to screw were tuned to resonance. Insulator and movsng clIsc Fig 3: Frequency response of 144MHz and 70MHz X hole In wall must be large enough lo filters The solution finally adopted was to use two allow screw-head through brass discs, about 25mm in diameter, as the plates of a variable capacitor. The fixed plate of The frequency response of each filter section of each capacitor was soldered to a ceramic stand- Fig 2: Construction details of tuning capacitors the prototype is shown above. The insertion loss off insulator, which was also used to secure the at the operating frequency is negligible, certainly The final step is to solder the fixed discs to the end of the corresponding coil. The movable less that 0.2dB. The measured rejection of the plate was soldered to the end of the 2BA screw stand-off insulators so that they are parallel to, unwanted frequency was 35dB for the 144MHz which was mounted in an anchor nut attached to and in line with, the moving discs. The easiest section and 40dB for the 70MHz section. way to do this is to clamp a fixed disc to the the side of the diecast box. Turning the screw The isolation between the two transceivers from outside the box provides a smooth adjust- corresponding moving disc, separated from it by has been found perfectly adequate in practice. an untinned washer of appropriate size, using a ment of the capacitance between the two plates. Transmitting on one band does not produce any small G-clamp or crocodile clip. The tuning screw noticeable effect on the other receiver, even is then adjusted until the fixed disc touches the when receiving weak signals. It would be easy to CONSTRUCTION top of the stand-off insulator. The two are then increase the unwanted frequency rejection by The unit was constructed in a diecast box meas- soldered together, the position arid angle of the building the unit in a larger box and positioning uring approximately 5in by 4in by 3in deep. fixed disc being guaranteed by its being clamped the coils and tuning capacitors further apart, and Square S0239 sockets were used for the con- to the moving disc. by incorporating screens. This improvement in nections to the two transceivers and the an- A slight problem was encountered with some filter response would, however, be at the ex- tenna. The 144MHz coils have seven turns and of the anchor nuts which did not always have pense of increased insertion loss.

RADIO COMMUNICATION October 1990 41 YAF-SU A MSTR A D

o S T A N D A R D. 1001\4 RTIN LYNcjj Authorised Dealer G4HKS 1ed Dealer THE AMATEUR RADIO EXCHANGE CENTRE 286 Northfield Avenue, Ealing, London W5 4JU. Tel; 081 566 I 120 Fax; 081 566 1207

After working with Bernie and Brenda for many years, it within 48 Hours and, if it is as good as you say, a the rumours and rumblings are true. I've finally opened cheque will be on it's way by return. Alternatively, up my own showroom specialising in Amateur Radio, exchange it for something of more interest to you or in Ealing, West London. In fact, in a very familiar leave it with me to sell for you on com mission. You tell location - at the other end of NORTHFIELD AVENUE me what you want, and I will guarantee that amount, where the original "AMATEUR RADIO EXCHANGE" once sold on the spot! used to be! Easy to park, (no it is not on a "gyrating" roundabout!), with Northfields Tube Station just across So, there it is. The showroom is nice and big for you to the road, Bus Stops everywhere, M4 and M25/M40 browse, and spend loads of money! (I've always liked motorways within minutes. the money bit!).

My policy? Much as it used to be in the earlier days - Whether you have something to buy or sell, give me a offering you a chance to buy or exchange good, clean ring - you will find other familiar faces at the shop who Amateur Radio Equipment at sensible prices. I'm an are dying to talk turkey. Have a rum mage for that AUTHORISED OUTLET for Yaesu, 'corn, Standard unwanted equipment - I want it NO W, to sell for you. and many more, plus a few I'm still working on, (Ian The quicker it is on display, the faster it gets sold and and Richard, please note!). That means you will get full you get your money. Simple isn't it!! service and spares back-up on all that I'll sell you. 73 Martin G4HKS

For fast mail order Tel: 081 566 1120 - Marlin Lynch is a Liceneed Credit Broker Please add £10 for 48 hour delivery. If you have any Amateur Equipment, Computers, Full details upon request Hi-Fi or Video to part exchange or sell, then ring now Shop opening hours: Tuesday - Saturday 10 - 6pm. PHONE 081 566 1120 for a quote. If you cannot get to the shop, I will collect Fax order line open 24 hours. Ime Ell

STEPHENS-JAMES LTD. 47 Warrington Road, Leigh, Lancs WN7 3EA. Telephone (0942) 676790 Turn at the Greyhound Motel on the A580 (East Lancs. Road). LANCASHIRE & THE NORTH WEST'S LEADING RETAILER IN AMATEUR RADIO

ANTENNA RANGE Kenwood Range Receivers C.ushcraft TSa5n-S HF Transceiver £2,199.00 AR2002 Scanning receiver coving A3 3 Element Tribander Beam £329.00 TS940s HF Transceive £1,995.00 25 550MHz and 800-1300MHz £487.00 A4 4 Element Tribander Beam £353.35 ATB40 Automatic Antenna tuner £244.88 R535 Aircraft Bands receiving coring 10-3CD 3 Element 10m Monobander £115.04 SP940 Speaker with filters £87.55 108-143 and 220-380MHz £249.00 15-3CD 3 Element 15m Monobander £139.70 TS440S HF Transceiver £1,138.81 R537 Handheld Aircraft Band Receiver £69.50 20-3CD 3 Element 20m Monobander £238.21 AT440 Automatic Antenna tuner £144.82 Antennas and accessories for above stocked AP8 8 Band Vertical 25h High £164.35 PS50 20 amp power supply £222.49 HF225 General Coverage Receiver £425.00 AR900 UK Scanner £199.00 AP5 5 Band Vertical 2511 High £150.00 751405 HF Transceiver . £862.00 WIN108 Handheld Scanning Airband Receiver 18 Element 2m Boomer Antenna £150.00 PS430 power supply £173.78 £175.00 15 Element 2m Boomer Antenna £96.00 AT250 Automatic Antenna tuning unit . £366.00 Ringo Ranger 2m Antenna £57.00 AC41 1000 Handheld scanner £249.00 AT230 Antenna tuning unit . £208.67 R5 New 5 Band Vertical Roof Mounting. Niew Model. Jupiter Mkt, Hand Held Scanner £299.00 TL922HF Linear amplifier £1,495.00 No Radials £259.00 Datong Range MC50 Base station microphone £46.00 I33W 1048.24 MHz Rotary Dipole £159.00 A0370 Ouldcxx Active Antenna £77.62 MC60A De Luxe desk microphone £88.22 Butternut A0270 Indoor Active Antenna £58.22 11751E 2m Multimode Mobile Transceiver £599.00 HF6VX 6 Band Vertical Antenna £167.00 070 Morse Tutor £63.40 TS680S HF • 6m Transceiver £995.00 HF2V 80/40 meter Vertical £142.00 MFJ Accessories Range All Butternut accessories mailable TH25 2m FM Handheld Transceiver £238.00 MFJ1701 6 way Antenna switch 1311.00 Hy-Gain Antenna Range available 1f-1205E 2m FM Handheld Transceiver ... £199.00 MFJ300 watt dummy load £9 00 Jaybeam TH215E 2m Handheld FM Transceiver £228.00 MFJRF Noise Bridge £84.00 TB3MK3 3 Element Tribander £365.00 TH405E 70 cm Handheld FM Transceiver £245.00 MFJ 815 2KW Cross needle SWR/Pcatiar meter . TB2MK3 2 Element Tribander £246.00 R5000 General coverage receiver £875.00 £75.00 TB I MK3 Rotary Triband dipole £123.00 VC2OVHF Converter 108-174MHz £167.21 Daiwa VR3MK3 Triband Vertical £5.00 12000 General coverage receiver £595.00 CS201 2 way Ant Switch £14.00 0134 4 & 5 Element Beam £139.00 VC1OVHF Converter 118-174MHz £161.95 NS660P 1.8-150MHz • PEP Meter £115.00 4Y/6m 6m 4 Element Beam £58.00 HS5 De Luxe headphones £37.54 Rotators 5 Element 2m Vagi m oo LF30A Low Pass Filter £34.00 GS400C £169.00 8 Element 2m Vagi £98.00 Tm231E 50 Watt Flu 2Ivi Mobile £289.00 GS600C £219.00 Antenna Tuning Units TM431E 35 Walt FM 70cm mobile £318.00 Hi Gain Ham IV Rotator £370.00 Kenwood AT230 £208.00 TM701E Dual Bander 25 Watt £469.00 CDE AR40 ...... £168.72 MFJ 9620 1.5 kWE Yersatuner £258.85 RZI Wide Band Scanner £465.00 CD 4511 £219.00 MFJ 949C 300W Versatuner £168.00 TH26E 2m Handheld transceiver £249.00 Emotator 1057SX £159.00 MFJ 303 Watt Basic ATU £96.89 Power Supplies MFJ 1601 Random Wire Tuner £48.00 PS120M 3-15V variable 12AMP max £79.50 "TEN TEC- Global AT1000 SWL Antenna Tuner £69.00 PS30MX 30AMP PSU £129.50 Wets We are pleased to announce we are the northern DI3ON 25-1300 MHz Discone Antenna £79.00 stockist tor the full Ten Tee range DCP5 5 band trappes vertical with radial kit £195.00 "PARAGON" Transceiver • General Coverage DCP4 4 band vertical £145.00 £1,839.00 Stockist for Heil microphones. Mirage ampfifiers Full Range of SWR/Power Meters. "CORSAIR" amateur band Transceiver £1,200.00 Global PublicatiOns by RSGB and ARRL. Antenna Traps. Insulators, etc New model "Omni Ir Amateur Bands Only Transceiver Post/carriage charged at cost. Full size G5RV Antenna 118.00 Our secondhand list is updated daily. Half size G5RV Antenna £16.00 Please send SAE for this or any information. Carriage/Postage at cost Full range of accessories. Paul - Filer- Shop Hours 9.30 to 5.00pm Mon-Fri. 4.30pm Sat.

42 RADIO CO M M UNICATIO N October 1990 YAESU • REVCO • G. WHIP • DRAE • STAR IVIASTERKEY • WELZ • DA TONG • I.C.S. • NA VICO • ICO M AMATEUR RADIO COMMUNICATIONS LTD. AUTHORISED ICOM, YAESU AND STANDARD DEALER

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RADIO COMMUNICATION October 1990 43 HEATHERLITE GR. GIV. PRODUCTS COMMUNICATIONS ON ON THE EAST COAST approved dealers for KEN WOOD inri GElectronic8 YAESU, ALINCO, FAIRMATE (Scanners), REVEX, JAYBEA M, DIA MOND, AZDEN, R&D Weather Stations, ILP EHT- Professionally designed Transformers, HL EHT -Power Supplies. HEATHERLITE Mobile Microphones, ZETAGI 12 amp & 25 Amp Power Supplies. and... equipment for Amateurs HEATHERLITE VALVE AMPLIFIERS. After the announcement in September RADCom we have hart TRANSVERTERS excellent respose to the new retail side of Heatherlite and would like FOR 6m & 4m to thank our customers for their support. If you live in Humberside. Nth Lincs., Yorkshire and if you are All transverters Individually tested to meet this high specification considering purchasing a new base station rig we will be pleased to Second harmonic: <-70dB Intermod: <-32dB give you a demonstration in your shack if you are unable to visit Spurii: <-60dB Noise figure: <2.5dB Heatherlite. If you buy a new mobile or portable rig from us we will Drive levels: 2m I.F....0.5-3W or 10W using 7dB switched attenuator give you a FREE Heatherlite mobile mic, for immediate safety while 10m I.F. 10m W-100m W or 100m W-1W or 1W-10W driving. •144/50MHz 25W pep £199 + £4 p&p We are always open for coffee and a chat but if you are interested in • 145/70MHz 25W pep £249 + £4 p&p a particular item please give us a ring first to check availability. We • 145/70MHz tOW pep £199 + £4 p&p hope to give all our customers a good pleasant service and welcome • 28/50MHz 25W pep £209 + £4 p&p you to try your rig before taking it home. Being a FULLY • 28/70MHz 10W pep £209 + £4 p&p APPROVED DEALER we have no problem about giving a MASTHEAD PRE AMPLIFIERS. Low noise GaAs FET design. complete after sales service. Specification. Gain 12dB. Noise figure: Typ .8dB We also have a good range of second-hand equipment including 200W power handling for 501v1Hz, 70MHz, 144MHz, 432MHz. 934MHz Linear Amplifiers (New amps also available Hi!). If you are repairing £109+ £4 p&p or building and get stuck give us a ring as we have a good range of 100W power handling for 2m, 4m. 6m £75+ £4 p&p parts and free advice, we are pleased to supply most bits from a 1/4w INDOOR PRE AMPLIFIERS resistor to a TS950SID. Try us! 100W power handling (50W) RF sensing for 2m, 4m, 6m £38 + £2 p&p Remember, Christmas is not tar away so get your orders in now POWER AMPLIFIERS Hope to see you at HORNSEA ELHOEX 50-52MHz 25W pep output 0.5W-3W drive including low pass filter and the LEICESTER SHO W. Ideal for FT690 £75 + £4 p&p 73's and 88's de Heather G8SAV, Peter G3ZRS, MET ANTENNAS Peter G4EJP, Simon 50MHz 3 el £42.95, 5 el £64.40, 70MHz 3 el £37.30 p&p £4.50 PROFESSIONAL SERVICES IN RF DESIGN AND EMC TESTING ( HEATHERLITE PRODUCTS — 75 SI Calherines Drive, Leconlield, 1 ARNOLDS COURT, ARNOLDS FARM LANE, Nth Numbs HU17 7NY, MOUNTNESSING, BRENTWOOD, Phone 0964 550921 Fax 0964 550921 .Q . ... ._[ go , ESSEX CM13 1UT Tel: 0277 352219 Fax: 0277 352968 VISA ...../1 F71 All prices include VAT

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44 RADIO COMMUNICATION October 1990 191 FRANCIS ROAD, OPEN MON-SAT 9AM-5.30PM LEYTON, LONDON E10 61‘10. INTEREST FREE HP FACILITIES AVAILABLE ON MANY ITEMS PROMPT MAIL ORDER TELEX 8953609 LEXTON G erg mmim PHONE 081-558 0854 081-556 1415 dress or ji Mlle 01 ge.nd 10 p• COMMUNICATIONS LTD. FAX 081-558 1298 NEW MODELS NRD 525 A OR 2515-5 MHZ-1 500 MHZ 62 Banks of 32 channels each scanning 32 I lc 970 E/H RECEIVER HF £950 channels per sec. 3!.4v sensitivity VHF AM/ 2 mtr + 70c ms base FM. Very impressive radio, same size as the K E N WO O D AOR 2002 station R5000 + ARA 30 £899 £575.00 R5000 only £799 KEN WOOD TH 75 dual band handheld 2/70 TS440 + AUTO ATU £1150 £.395.00 KENWOOD TM 701 dual mobile RC20 4 TS440 + AUTO ATU + PSU + interface available £159.00 IC 229 E MIC £1299 YAESU FT 470 dual band handheld, 2 mtr + TS680 + MIC £895 70 cms £385.00 103220 E/H TR751 £599 ALL YAESU STOCKED - PLEASE CALL IC901 RZ1 £469 1024 TR731 £675 N E W IC2SE/SET PHONE FOR OFFERS ON ALL YAESU A O R 30 0 0 IC4SE/SET 10765 FT736 £1190 MAJOR FEATURES • The AR3000 covers the frequency range ot 100kHz to 10781 FRG8800 £575 2036MHz without any gaps in the tuning tango. • All-models are provided:- Narrow FM. WidefleuAM. ICR100 FT23R + 470 + 411 + FT1000 USB. LSB and CW. N E W ICR72 • 400 memory channels In 4 banks oil00 ire provided STANDARD 0528 £375 • High speed scanning at 20 channels per second. • Frequency Increments are selectable in 50Hz steps I CR1 FEW ONLY C500 £335 Horn 50 Hz to 100kHz. • Computer control is possible, using the ALL ICOM AVAILABLE All STANDARD ACCESSORIES AYAILABLE communications port RS232. 24 HOUR HOTLINE ANS WERPHONE NO 0 81- 5 5 8 08 5 4 A OR 1000 NO W £239 O R C O NT A CT OU R LO C AL AGE N T ANYTI M E ON TH E FOLL O WIN G NU M BE R S: + DRESSLE R AR A 1500 £1 59 S T U A R T, (B R O M L E Y, K E N T) 08 1-4 6 6 51 9 9, 08 6 0 63 4 5 2 6 + AR A 30 £1 39 T E R R Y, (BIG GLES W A DE, B E D S) 07 8 7 31 6 4 31

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RADIO COMMUNICATION October 1990 45 Avoiding Wind Vibration Damage to Aerials

by Arthur Bolton, GM3BMI

INTRODUCTION needs to be protected. The remedies available as possible, and dampers to reduce any remain- are of three kinds: to reduce the amount of ing amplitudes of vibration. AN EXCELLENT PAPER (1) has already set out excitation fed in by the wind, if possible to zero; the way to design aerials and masts for static to damp out whatever energy is unavoidably fed The size of the dynamic lorces exerted on strength against wind forces, as well as giving the aerial. in by using suitable devices; or to move the much practical advice. If the guidance offered frequency of any resonance to a less trouble- The amplitude of the vortex shedding force therein is followed, aerial damage by static wind some value by changing the diameter or wall depends on the square or the wind velocity, the forces should be avoided. Unfortunately aerials thickness of the member concerned, or adding a geometry of the section and the density of air. may be set into vibration by the wind and the brace to prevent that mode. With a safety allowance for different sectional alternating stresses for vibration are increased shapes, and converting the force to Newtons per by a dynamic magnifier, which has exactly the metre run of element for convenience in the later same mathematical basis as the Q value of a VORTEX SHEDDING calculations, it works out as about:- tuned circuit, and may have a value of 60 or 70 The wind and the aerial can form a self-excited times. This article is intended to extend G3ZPF's oscillator. Vortices are shed from the elements F = 0.33 D x v2 N/m (2) paper by describing the dynamic behaviour of or the mast as in Fig 1, and trail downwind typical aerials under the action of wind forces imparting a series of synchronous force pulses Suppose the 50mm mast in the previous and to show how damage arising from vibration to an element or the mast as each vortex breaks example were 5m high, the maximum amplitude might be avoided. away. These pulses can maintain the vibrations of force acting on the mast would be:- The usual and most serious dynamic problem in the member if the shedding frequency is within arises from vortex shedding, which can set an about 20% of the natural frequency of vibration F = 0.33 x 0.050 x 40 2 = 26.7 N/m aerial into prolonged vibration across the wind. of the element. The frequency of vortex shed- This can cause rapid failure when the wind ding is:- This is about 134 N overall (over 30Ibs in speed rises during a big storm and the amplitude vxS/D (1) Imperial units) repeatedly applied from side to exceeds the failure limit. Failure in the first big side and, if the mast had a natural frequency where:- storm shows that the strength was insufficient close to 160Hz. would surely destroy it, even f„ is the frequency (Hz) of shedding pairs of for the combined static (D.C.) and dynamic though it met the static requirements of refer- vortices, one from each 'edge' of the section, (A.C.) loads in spite of the fact that the calcula- ence [1). tions concerned with static conditions include an y is the wind velocity (metres per second), allowance for gusts. The trouble is that the perpendicular to a horizontal element, or in any Coupling of the vortex shedding forces to allowance is only 10% or so when the dynamic direction for a vertical mast, the mechanical structure of the element, magnifier for vibrations in 6000%. S is the non-dimensional Strouhal number, boom or mast. 0.2 for cylindrical sections and about 0.13 for Vortex shedding might alternatively give rise The vortex shedding forces are only able to exert most 'structural' sections. and to failure after a relatively short time in service. their damaging effect if they are in tune with a D is the depth (metres) of the section facing during which wind speeds were never more than mechanical vibration of the aerial. If the natural the wind (the diameter for tubular members). moderate. In this case metal fatigue is the culprit resonant frequency of vibration of the aerial is The use of a consistent system of units has and arises from repeated loading at stresses far close to the vortex shedding frequency being been emphasised to prevent errors in calcula- less than would be required to fail the element or generated by the wind, the forces produced by tions concerned with mechanical vibrations, eg mast if applied only once. vortex shedding will maintain vibration of the the metre for length, kilogram for mass, Newton Fatigue cracks often start at surface scratches, aerial at that natural frequency. This is much like for force and Hz for frequency. It might seem holes, clamps or changes or cross-section, and the way in which a tuned circuit can couple to a natural to use centimetres or millimetres espe- then progress across the whole member until, tuned circuit in the next stage as long as both are cially for areas or the physical constants of for example, half an element falls off. The failure tuned to the right frequency. If one circuit is materials but this often leads to errors and is best surface often shows 'tidal marks where the mistuned the amplitude will be reduced or may avoided. It might seem even more natural to use failure progressed through the metal by fits and even disappear. pounds and feet or inches but the system listed starts. It is known that fatigue arises from hun- The mechanical vibration depends upon the really is better for vibration and easier after a little dreds of thousands of repetitions of small closeness of the natural frequency to the forcing practice. stresses. Notice that if an aerial element vibrates frequency of the vortex shedding. If the two It will be seen from equation (1) that as the in the wind at 10Hz this is 600 repetitions per frequencies are identical, experiment shows that wind speed rises the frequency of vortex shed- minute or well over 400,000 repetitions when the the mechanical dynamic magnification, or Q, of ding increases proportionately. The owner of an wind has blown at the 'awkward' speed for as a typical aerial array is about 60 times (although aerial needs to consider a frequency band stretch- little as twelve hours in total. This awkward wind if it were welded together the 0 might reach ing from zero to the frequency generated at the speed is the one which sets the aerial into 100). This means that the amplitude of deflec- highest wind speed possible at the site, because oscillation and might be only five or six metres/ tion produced by the continuous application of the wind might blow at any speed in between. second rather than the full gale force which the vortex shedding forces will be 60 times as For example, if an aerial mast is a pole of 50mm could occur at the site. great as would be produced by the single appli- external diameter and the maximum wind speed The ideal solution to the problem of vortex cation of a static force of the same size. The is 40 metres/second the band of vortex frequen- shedding is at the design stage by avoiding any stresses in the aerial are likewise 60 times as cies stretches from zero to:- resonances which might be excited by the wind. great for the vibrating case as they are when the This will not always be possible and any existing same forces are applied but there is no vibration. f, = 40 m/s x 0.20 / 0.050m = 160Hz aerial which presently vibrates in the wind also The natural frequency will be exactly matched by the vortex shedding frequency at the 'awk- This shows that the band of exciting frequen- ward' wind speed and Q will be 60. If however cies is very wide and could lead to vibration as Street of v ortuces the lowest natural frequency is different from the the wind speed rises through each successive vortex shedding frequency being generated by natural frequency of the mast. Over such a the wind, the dynamic magnifier will be reduced range it might possibly excite any of the lowest to a value:- U ù J three or four natural frequencies. This indicates 1.-1 cycle —.I the difficulty of dealing with vortex shedding by O = 1 / [1+1'412-1/60 2)J (3) bracing or other structural design techniques alone. It points up the need to consider spoilers where r is the ratio of forcing frequency to natural Fig 1. of some kind to prevent vortex shedding as far frequency.

46 RADIO COMMUNICATION October 1990 WIND VIBRATION

It is possible to calculate the amplitude of any horizontal cord to support the ends as in Figs 2 to make the fin 'downstream' when the awkward vibration of an aerial in the wind. The procedure and 3. Both are preferable to drooping elements wind is blowing. Of course if the storms always is to find the band of vortex shedding frequen- if there is any sign of vibration. Often an array blow up from one direction afin might be a useful cies for the mast and any of the elements using can be improved considerably by using thin adjunct to a mast. equation (1) and confirm either that there is a cords as triangulated bracing between the vari- natural frequency within that band or to find the ous elements of the array. It is cheap, light and nearest corresponding natural frequency above 'invisible' and it improves both aerodynamic and that band. This amounts to finding the lowest structural damping. natural frequency using the coefficients given in Sometimes one particular mode of vibration is the appendix. If the natural frequency lies within evident, for example, although the strength of an the vortex shedding frequency band, Q will be unguyed mast is quite sufficient, it does vibrate 60. Otherwise, the ratio of the highest vortex appreciably at some steady wind speed. Com- shedding frequency to the natural frequency can mon sense tells us to guy the mast with three be found and thus the value of Q from equation stays too prevent that mode. Very little strength (3). The value of the force applied to the aerial will be needed in the guys if the mast really is can be determined from equation (2) and the sufficiently strong, and almost invisible guys elastic deflection for a static force of this size, might get rid of the trouble. again using the data given in the appendix. Multiplying the static deflection by the magnifier SPOILERS Q will give the required amplitude of vibration. The dynamic stresses can likewise be deter- Spoilers are of several kinds but the simplest mined. and cheapest is to wrap a spiral of thickish cord All this calculation is a lot of trouble but if a from end to end of the member as in Fig 4. This radio amateur were embarking on an expensive prevents the simultaneous shedding of a vortex Fig 6. new multi-element array to be set up on a moun- along its whole length. Wire is not as satisfactory tain somewhere, it might be worthwhile to do this as cord because of its weight and the likelihood calculation and design out any problems before of electrolytic corrosion. The 'strakes often seen DAMPING a single element is cut. Most of us, however, spiralling round the top third of steel chimneys Damping is a marvellous cure for vibration. The merely wish to cure that noisy vibration on the are a luxury version of course. They are often a problem is to obtain dampers light enough and of roof, or try to make the array last longer than the 'three start helix' with the pitch carefully chosen. the right range of strength for aerial arrays, and first six weeks of every winter. In this case we but a vibrating oil rig under construction was to find a suitable anchor for them. A car shock can short cut the calculations and rely on stilled by wrapping a handy rope spirally round absorber is just a damper, of course, consisting Murphy's Law to ordain that there will surely be the vertical members as a stop gap until the tops of two eyebolts held together by a spring in an 'awkward' wind speed which we cannot pre- were properly welded. parallel with a dashpot. The eyebolts apply ex- vent by design and which will impair our aerial ternal force from the part to be damped but the unless we can circumvent it. spring cannot be compressed or return to its original position without oil in the dashpot being Methods of reducing problems. forced through a small hole or round the edges Wind excited vibration can be reduced or even of a slightly undersized piston. There is a fully prevented by:- worked out theory about how much damping to Fig 4. 1. Making members less liable to easy vibration use but lorry shock absorbers rated for 10 tons have been used as dampers in structures. Few 2. Using spoilers on any members at risk to It is possible to use a shroud fitted close to the amateurs can have a stayed mast tall enough to prevent vortex shedding from the whole end of an element and consisting of a hollow merit this treatment but, if a mast were suffering member at the same time cylinder, about 10% larger in diameter than the element and about 10% of its length, punched vibration from vortex shedding, a suitable damper 3. Incorporating more damping with square holes (not round) and fitted over the connected between the end of the stay and the and in every case by using common sense like element close to the ends. The air entering from ground could work wonders, Fig 7. Even a layer at least pointing a Vagi in the best direction the windward side, flowing round the element of soft fabric or other material between an aerial during a storm. and out on the lee side, stabilises the element. element and its clamp can make a difference. They are troublesome to make in small diame- IMPROVING THE STRUCTURE ters but large examples are sometimes seen near the top of steel chimneys. Cantilevers with one end free are notoriously Vortex shedding does not take place in a easy to vibrate and a Vagi array is just a collec- synchronous way unless the member has a tion of cantilevers fastened to a boom. There are clear uniform section at least 20 diameters long. seldom problems at vhf where the cantilevers Moreover, members of the 'wrong' diameter at are short and stiff but the longer cantilevers of any given wind speed, damp out much the same lower frequencies are vulnerable. An element amount of energy aerodynamically as that which which visibly sags can be stiffened by support- those of the 'right' diameter receive from the ing the ends with a cord to a support point above wind. It is possible to balance the positive exci- the boom, or by passing the cord through the tation and the damping by a suitable mixture of element and using the tension in the external element diameters as in Fig 5. The two diame- ters of the element must differ by about 25% and approximately equal frontal areas of the two Cord diameters should be used. Fig 7. E em ent

Aerodynamic damping is equally acceptable Il and often easier to arrange. If a vibrating mem- ber carries members of other diameters across the airstream much damping can be gained. Fig 2. Imagine details of the 'flyswat aerial' appearing in which the owner swears that by soldering a Fig 5. wire mesh flyswat to each end of his Vagi ele- Cara ments he has not only cured all vibration but Ele ment The vortex street can be disrupted by using a improved his SWR. the bandwidth of his array, fin on the downstream side of the member. and worked all the squares in Europe. Perhaps Sometimes short tabs are used at intervals along some of these advantages might be gained by the length and sometimes a single fin near the ending each of the elements with a skeleton wire free end, Fig 6. The problem in this case is to cone as in Fig 8. I vaguely recall a paper many Fig 3. make sure the aerial points in the right direction years ago advocating this for electrical reasons,

RADIO COMMUNICATION October 1990 47 WIND VIBRATION although the length of the element has to be adjusted slightly. The aerodynamic damping of Equivalent Equivalent the elements is what normally prevents the boom Frequency spring mass of a Vagi vibrating when the wind is blowing at Type of member right angles to it. stiffness (ME)

i(E1/p1.4) X (El/L 3) X (pL) X

Cantilever p kg/m 0-560 3 0.242 / L metres I. 1.1 Fig B. Cantilever end G3VA in his 'Technical Topics (which actu- ally inspired this article) has more than once p kg/m drawn attention to another form of damper in 0 0.242 which energy is dissipated by a piece of split hose or the like fixed near the end of elements Gl i e4 i t, [21. L metres Common sense is important, if there is a 1 problem about vibration it is important to do something about it quickly. The calculations 2 Pin ends necessary for a mast carrying a boom support- ing an array are given in the appendix and may p kg/m -4 help. All radio amateurs have learned some A.C. 1.571 48 0-493 theory and mechanical vibration is merely a branch of audio oscillation, which can be tackled with confidence if we set our minds to it. L metres 14 >1 APPENDIX Fixed/Pinned 1. Useful Data p kg/m Young's modulus, E, , 2.45 101• 9 0.422 Steel. 2.05 x 10" Nini' Aluminium alloy. 7.00 x 10'° Nie Copper. 1 03 x 10" Nini" The densifies and ultimate tensile strength of the three metals L metres are:- 14 I Steel: 7830 kgirn' 430 Nimm" Aluminium alloy. 2680 kg/m' 300 M'au& Copper: 8860 ken' 300 N/mmr Table 1, Maximum working stresses are about two thirds ot the ultimate values. II vibrates in the mode shown it can be seen to consist of two 4. Stress imposed on the material cantilever ends and a central beam. We could find the stiltness of the centre of the member experimentally by hanging a weight The maximum dynamic stress is obtained from F. the vortex 2. Fatigue Stress of, say, 80 N there and measuring the deflection under the load. force given in equation (2). the dynamic magnifier, 0, the length, If the alternating stress can be kept below about 70 Nimmr for If this were 5mm 10.005 ml the stillness would be the force L. of the member, es I value, and its diameter : D. steel there will be no fatigue effects. Unfortunately there is no applied divided by the deflection caused, le 80 N.'0,005 in or The formula for a cantilever, or a cantilever end is • such fatigue firnit for aluminium alloy or copper and fatigue 16.000 Ntm. damage will accumulate even at very low stresses. If the A table of stiffnesses to obviate the experlmental effort for Stress . (F x x x 011 (4 x (5) alternating stress can be limited to 20 Nirarn', however, a mernbers often used is given in Table 1. The difference between satislactory service Ide will be obtained. cantilever ends and cantilevers in the table should be noticed. The formula for a member supported al both ends is'. The second moment of area, I, The cantilever end has no stiffness Of ils own, any stiffness il possesses is merely taken from the morn member leaving the For a thtn-walled tube of ouler diameter D maires and wall Stress . IF x If x 0 x /116 x (6) total unchanged. A true conttever gains stiffness from its fixed thickness to metres support as does a double cantilever member, eg an element I rf.t.D'(8 m' fixed only at its centre. The table allows you to work out the Il you substitute for F. 0 = 60. and I in (5) you will find the numerical values for tubes ol different diameters, metals and stress is:- wall thicknesses from the data given 140 x (e x L)') i Ir( x t x DI N.rar 3. Natural frequencies Now what about the appropriate mass? According to the There is a wealth of information on natural frequencies, usually theory the mass ts vibrating on the end of the spring, ne where we =112.73 Iv.L)r t)] x !Aim e via differential equations. and matrix algebra. Most amateurs measure the stifiness This presents a problem because the. mass. 01 an element is distributed uniformly along its length would prefer an approximation within about 10% of the 'exact' The corresponding stress for a member supported at both rather than being concentrated at the point where we measure frequency if it could be obtained by simple arithmetic and this is ends ts:- what is shown below. the stiffness If the members were so light as to be ol negligible Basically. any vibrating system can be related to the case of soif mass and a 3kg mass were hung in the centre of the = (3.18 (v.LF (D1)) x 10' Nranmr a single mass vibrating on the end of a spring ln this case the element. the frequency !rom equation 4 would be:• naturel frequency is:. - it(16,000/3) = 11.6Hz Since the tengths of the cantilever end and the part between 1, = (1,2n) x '.(elastic stiffnessimass vibrated1 (4) the hvo supports will be different. it is necessary to calculate both ln tact the self-mass of the array is all important and separate stresses and choose the higher. An element with two supports There are therefore only two things needed, the appropriate masses are seldom applied The appropriate mass mentioned and two cantilever ends has its 'middle of the span' stress earlier is that which, concentrated where we measure the stiffness and the appropriate mass of the elements. The theory reduced by the amount of the cantilever end stress because of stiffness, would have the sanie ellect on the frequency as the does not depend on the shape of the spring, a might be a leal the contininly. The effective fatigue stress is then the larger of spring or a cantilever instead of a coiled spring; it could be a distributed mass of the element. This can be calculated and is the cantilever end stress and this reduced central stress. shown in Table 1. You will notice that for a cantilever the structure as in Flg 9, which you might otherwise have thought was one element of an aerial array supported by two booms 11. equivalent mass applied at the end is about one quarter ol the self mass and for a member supported at both ends about a hall 5. The amplitude of vibration of the total self mass applied al the centre. Occasionally there will also be a concentrated mass to The amplitude of vibration of the end of a canti- consider as, for exemple, when a cantilever mastcarries a rotary lever array on the top. In Iras case, add the concentrated mass of the Fx0xL'i8x Ext (7) _ array to the equivalent self-mass of the mast lo obtain the total equivalent mass. Sometimes there will be more than one member, for exemple, when a mast is guyed at two levels. There where all the terms have been defined before and their are then in essence two vertical members, the lower with one values can be substituted for particular members. The ampli• 1-0.75m -1- - 1 70m I O 75m___1 end f ixed in the ground and its top end pinned by the guys but todo of the centre of a member simply supported at both ends is free to relate' and probably a cantilever end on top to carry the likewise:. array. In this case add the separate sierra:esses and equivalent Fig 9, masses from Table 1 to oblatn the total equivalents. 5xFx 0xL` 3114 xExl (BI

48 RADIO COMMUNICATION October 1990 WIND VIBRATION

5. Examples 1) A steel mast of 65mm external diameter and 6mm wail thickness. 12m high and carrying an array of total weight 25kg.

a: Member properties

E value = 2 05 x 10" Nm '

Mass per metre = n x 0 065 x 0.006 x 1 m x 7830 = 9.59 kg/rn

I value • et x 0.006 x (0.065)' / 8 = 647x10 ' m'

El value 1 326 x 10' Nm ,

b: Maximum vortex shedding frequency

F. = 45m/s s 0 20 / 0.065m = 138Hz

c. Natural frequency

Equivalent spring stiffness = 3E1 - 3 x 1.326 x 10' / 12' . 230 N'm

Equivalent mass = 0.24 apaL• concentrated mass • 0.24 a 959 x 12 . 25kg = 52 9kg

Lowest natural frequency = (1/25) x v[(2301/(52.9)1 0 332Hz

II is seen that the natural frequency lies within the possible band of excitation which stretches Irom zero to 138Hz A check should therefore be made on any liability to fatigue and the amplitude of vibration For stresses and amplitudes of vibration only the dynamic forces are concerned since these are what force the vibration, ro the steady wind drag force is not included. The dynamic stress produced by vortex shedding along the 12m This article arrived just before the Jan 25 storm. As the photograph shows, we didn't read It In time! mast is from equation (5):-

= [12.73 (v.l.)'/(D.I)) x 10" l‘emre' 2) The same mast but stayed at ils top and mid-point with light 13.18 x t2.17x6)? / (0 065x0 006)1x 10* Wove' = 1.38 Nim e guy ropes it therefore consists of two members each 6m long where y is the velocity driving the lowest natural frequency and with the lower end fixed in the ground. Using Table 1:- Again this is lar too small for any fatigue damage. can be obtained by simple proportion. II 138Hz is the vortex

frequency produced by a wind speed ol 45mIs then the opera. - Total equivalent stiffness = (48 • 101.9) x El r L' The amplitude of vibration from equation (7) gives - live 0.332Hz will be produced by a wind speedo! 45 x 0.332 138 = 149.9 x 1.326 x 10' ,' 6` = 92022 NMI = 0.108m.s. The dynamic stress in the steel tube at its base is 5 aFx 0xL'/ 384 aExl- 1.54x 10'mor 0.15mmand therefore*. The self mass of the array is now fixed by the top stay, there- quite satisfactory. fore:- (12.73 s (0.108x12)'/(0 065x0.006)) a 10' Nirnm' • 0.05 >W m" Total equivalent mass • (0.493 • 0.4221 apx L = 0.915 x 9.59 x 6kg 52.65kg This is far too small lor any langue damage but there is still the REFERENCES need to check the amplitude of vibration by equation (7). Substi- Lowest natural keg uency (1/2x) x N1(92024(52.65)1= 6 66Hz tuting for F. 0 = 60. L and El gives.. [1] 'Wind Loading', DJ Reynolds, G3ZPF, Radio The dynamic stress produced by vortex shedding along the 6m 0.108 x 60 x 12' 8 x 1.326 x 10' = 0.127 m • 1 27mm span is from equation (6):• Communication April,'May 1988. pp 252-255, 340-341. This is rather large for comfort although II is sate as far as the 13.18 (v.Le rID.1)] x 10" Ntrnm , where V = 45 x 6.66..138 stress ,s concerned and commercial specit 'cations often allow a 2.17m/s [2] 'Technical Topics', Pat Hawker, G3VA, Ra- deflection of 1% of the mast height It would be wise lo guy the mast and recalculate the I requency, stress and amplitude for the The dynamic stress in the centre of the 6m upper span is dio Communication November 1989. pp 36- new configuration therefore.- 37-

fine in-depth general look at listening, introducing us Book Review to the frequencies, conditions, interference, fading and distortion, aerials and propagation, and signal identification. country beams its transmissions to the United King- GUIDE TO BROADCASTING Most SWLs, whether amateur or broadcast enthu- dom. STATIONS siasts, find most pleasure in sending reception re- Let us take a slightly more detailed look at the first ports and getting OSL cards. The next section is a Edited by Philip Barrington 50 pages which act as the guide for the beginner. must as it provides a very detailed insight into what BC Firstly, it looks at the world of broadcasting outside Published by Heinemann Newnes: ISBN number 0 SWLs should concentrate on when sending reports to the UK, offering the view that with so many powerful 434 90309 4 stations. In broadcast circles, some of the QSLs (and transmitters here, most people only find the occa- pennants) on offer for a useful reception report are THE 1989/90 EDITION of this popular handbook has sional interference from an adjacent broadcast station superb colour cards which are well worth displaying been on the bookstalls for several months now, but we an annoyance. However, those interested in broad- on the shack wall. It advises SWLs to make their have only just got around to reviewing it. It is edited by cast band listening would be more likely to try to reports stand out, but in the BC business it seems that Philip Darrington. but has chapters written by several receive the 'interfering' station rather than the local, some DX clubs offer standard printed forms - not at all leading personalities and is well worth a place an your stronger one. appropriate for amateur reports. and, I imagine, not bookshelf, even if you are not keen on broadcast Just like broadcast stations here, foreign stations very easy to make them 'stand out'. However, the listening. will transmit news and current affairs programmes. chapter has some useful advice which will obviously It successfully combines useful introductory mate- but will encourage you to listen longer by broadcast- benefit the BC SWL. rial for anyone nevi to Short-Wave Listening, and ing feature programmes about their corner of the provides a formidable list of long-wave, medium- globe. There are also stations that feature special The final section before the list of frequencies and wave and short-wave broadcast stations. It also pro- programmes for the SWL, and provide technical tips, stations is one which describes loop antennas. This vides a useful alphabetical list of which countries have equipment reviews and DX information. wit be of particular interest to those BC SWLs who transmitters on which frequencies, an example being For those interested in getting into BC listening, cannot put up external antennas. that anyone looking for a transmission from the Cape there is a useful table showing which receivers are on The guide has obvious advantages to the SWL who Verde Islands is told that 3.931kHz is the place to the market and their capabilities. From this it would be specialises in listening to broadcast stations, as it monitor Going to the other extreme, it is useful to possible to form a view about which receiver you provides a comprehensive list of frequencies and the know that if you are looking for Radio Moscow, you might wish to purchase. The details are only brief, but stations which use them. It is in its twentieth year and have 406 frequencies to choose from! There is also a they give a hint of the capabilities of the sets. will quite obviously continue for many years yet. worthwhile section which tells you when a particular Pat Hawker, who needs no introduction, provides a ORS32525

RADIO COMMUNICATION October 1990 49 LEICESTER STAND S36 CO CO CO RAYCOM CUSTOMERS de G6PZZ/G4KZH

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RADIO COMMUNICATION October 1990 51 published many antenna designs from these QRP FRO M THE ISLANDS undaunted spirits. Recently, there has been a HERBERT (PETE) HOOVER Ill, W6ZH lot of interest in the use of magnetic loop enjoys QRP and Islands. In recent years he antennas. There have been so many variants has been taking a small home built station on on this theme that SPRAT has contained an travels to islands. Pete has worked from example of a loop antenna design in every several Southern Pacific islands, and last year issue for the last two years: everything from worked from Scandinavian islands and sophisticated plumbing to bits of wire wrapped Iceland. Next he plans to work from the GEORGE DOBBS G 3RJV around wooden frames. One example folded Orkney Islands. the Hebrides and the Isle of St. AKIan's Vicarage. 498 Manchester Road, down to fit into a suitcase for the traveller to Rochdale OL11 3HE Man. His station is an illustration of what I was use in hotel rooms. saying above. The transceiver is based upon Gus Taylor, G8PG. has been interested in the "Worldradio". a 14MHz superhet design small antennas for many years and has by Rick Littlefield, K1BQT. and published in offered invaluable advice to individual radio the January 1988 issue of the now defunct NO ANTENNA SPACE? amateurs with antenna problems. In the HAM RADIO magazine. Alongside this small "RADIO AMATEURS DIVIDE roughly into two autumn issue of SPRAT, G8PG, offers a non- transceiver he has an indentical case which groups : those who have small back gardens inductively loaded balanced antenna that is houses a mains power supply, ATU and SWR which badly restrict their hobby .... and those ten feet long. It is based upon an idea I have Bridge. The transceiver contains an audio filter who have small back gardens and make the used in the past for restricted space and keyer, giving a complete compact station best use of what space they have." A trite counterpoise wires; in fact I think I got that in two boxes. The antenna system is based statement but it does sum up the perverse idea from Gus. The technique is to compress upon the probable restrictions of hotel rooms nature of our hobby. Wanting to maintain the length of a wire by arranging it in a zig-zag and "wayside" operating. Pete takes two world-wide short wave communication from a fashion. Not only does this get a lot of wire antennas. The main antenna is a simple 20 private house is a rather odd aim. Many into a small space but the loading effect. metre dipole. It is surprising where a 20 metre amateurs curse the restrictions endemic to which is non-inductive increases the electrical dipole will fit and tennis balls aré used to such a pursuit but for the "true" amateur this length of the wire. Two such elements are fed launch fishing line over available support is what puts the edge on the hobby. Those with balanced feeder and can be loaded up on points. The alternative antenna is a home restrictions of space, money and time are seven HF bands. The results achieved with made collapsible centre loaded 12 foot whip. challenges rather than curses, they are what the prototype using 3W of RF power are very This whip is mounted using a "mole wrench makes the hobby so fascinating. To these impressive. The details can be found in type" clamp to window frames, fence posts, restrictions. the QRP operator adds another, SPRA T64, and G8PG is to follow this up with trees, car doors or whatever. The whip is the limitation of power. a very simple loop design for indoor use on tuned against counterpoise wires laid out It is commonly assumed that ORP stations seven HF bands. wherever they will fit. must have large and effective antennas in Oddly enough, when G8PG first sent me I met Pete at the Dayton Hamvention this order to achieve any results. The truth of the details of this antenna, I had just tested a year where he introduced me to his matter is that many ORP operators are commercial restricted space antenna. An "wandering station". When he left Dayton he working under severe antenna restrictions. example of the Sagant ZA-14 end fed zepp took a 30 day 9,000 mile trip round the USA Very few ORP stations appear to use a had been sent to me for evaluation. The total and had QS0s from each of the 10 USA call rotatable beam. It may be that using a beam length of this antenna is 9.9m which would fit areas using the transceiver and the loaded and tower costing several hundred pounds into a very modest garden. I hoisted it up in whip antenna. With his inexpensive home built does not seem appropriate to a home built my small front garden between the first floor station and antenna system to set up transmitter costing a few pounds. Certainly, if window frame and a tree to a height of about wherever he happens to find himself. W6ZH is the G ORP Club membership represents a 2011. My first QS0 using 5W gave me a report a fine example to all those who say that they typical sample of QRP operators, many of of 599 from UW9CM which was pleasing cannot work the HF bands from their location. them work within strict constraints of antenna enough. But the second OSO was a two way space. An inspection of many ORP stations ORP OSO. 5W both ways, with FY/DJOPJ OVERSEAS QRP CLUB would reveal ingenious use of cheap wire in with mutual 569 reports. A nice reminder to THERE IS A WHOLE network of ORP groups small spaces. me that contacts like that are worth ten times and clubs worldwide most of which belong to SPRAT, the journal of the G QRP Club has more when the odds are being beaten. the World ORP Federation (WQF) an

PHOTOGRAPH Vfarl international grouping of organisations which accept 5W or less of RF power as the accepted level for ORP operation. Amongst the more recent clubs. the OK ORP Club is now firmly established and has just begun its own magazine, OK ORP INFO. This is mainly in Czech with some English text. Overseas radio amateurs can join the OK QRP Club for 15 IRCs a year. Applications should be made to Petr Doudera, OK1CZ, U1 Batterie1. 16200 Praha 6, Czechoslovakia. Many UK ORP operators are members of the American Club called the QRP ARCI. Membership is $14.00 for overseas members and then $12.00 to renew each year. Applications can be made direct to the Membership Chairman : Mike Kilgore, KG5F, 2046 Ash Hill Road, Carrollton, Texas 75007, USA. The club promotes a wide range of activities and issues a well produced quarterly magazine called the QRP QUARTERLY. Radio amateurs from any part of the world are welcome to join the G ORP Club and receive its quarterly journal SPRAT. Application forms and a free sample of SPRAT can be had from David Jackson, G4HYY, Castle Lodge West, Halifax Road, The complete W6ZH Portable Operation Package. The Worldradio Transceiver and Power Supply Unit with the 12 foot collapsible whip antenna and counterpoise wire, 20 metre dipole and feeder, clamp for the whip, Todmorden. Lancashire, OL14 5S0. The mains adaptors, tools, multimeter, fishing line and tennis balls for throwing up the dipole. The complete membership subscription is £5.00 or $10 per package fits into one carry-on bag. year.

52 RADIO COMMUNICATION October 1990 Martin Davidoff. K2UBC. for all the work he had put into producing the Satellite Experimenter's Handbook (available from RSGB publications • see page 79), which had proved so useful in helping SWLs and newcomers to satellites to overcome their emaeeCisz initial difficulties. He presented Martin with a 'coffee table' space book, as a token of SWLs ARTHUR GEE G2UK gratitude to him. He also presented Ron 21 Romany Road OuIton Broad. SuIfotk Broadbent with a FAX machine from the SWL NR32 3PJ fraternity for use in his work with AMSAT-UK. This report on the SWL interest in satellites came as a bit of a surprise to those responsible for amateur satellite organisation SATELLITE COLLOQUIUM and it was apparent that the SWL requirements should receive more attention in THE FIFTH AMSAT-UK Satellite Colloquium future. was held at the University of Surrey from 26 to 29 July 1990. A very comprehensive Saturday's programme included a talk by programme had been arranged for the 180 Geoff Perry, well known broadcaster and delegates who attended from 29 countries. writer on satellite affairs, who gave an entertaining account of some of his recent The lectures and discussions covered a great variety of topics relevant to the satellite scene. experiences under the title 'I haven't got a callsign, bur. Laurence Howell. GM4DMA, Thursday. 26th. designated 'International gave a fascinating account, illustrated by M ET-2 Weather Amateur Satellite Day', was given over to some beautiful slides of his radio activities Satellite Receiver discussions by leading personalities in that with Sir Ranulph Fieriness North Pole '90 field on the present and future use of amateur A complete weather satellite Expedition. Dr Martin Sweeting spoke on satellites. The day's proceedings were chaired receive system to operate with UoSAT Spacecraft on Arianne, and Dr Karl by C. Van Dijk. PAOCC, Chairman of IARU your IBM-PC (or clone) for less Meinzer gave an overview of the Phase-3 D than the price of a good HF Region 1's VHF Committee. He covered very project. Numerous other topics were covered receiver! All IBM-PC display modes thoroughly recent IARU events and decisions by specialist speakers. The Colloquium Buffet are covered up to enhanced VGA at towards WARC *92. Dr.Karl Meinzer. DJ4ZC. Dinner completed Saturday's proceedings, 600 x 800x 64 grey levels or colours. had some pertinent words to say on 'What do following which the traditional Junk Sale was This is the maximum resolution of you want on the next Phase 3 Satellite, and held, adding considerably to the Colloquium the satellite. A plug in NO M low are you willing to pay for it?'. earth orbiting satellite receiver op- funds. tion is available. Screen animation Doug Loughmiller, President AMSAT-NA, Sunday saw another day of lectures and laser printer dump software are dealt with 'Future satellite projects by AMSAT- covering a variety of topics too varied to detail included in the price. The package NA'. Some interesting comments came from here. Dr F Yamashita. of the Japanese includes:- Dr Martin Sweeting, G3YJO. Director UoSAT. amateur radio society spoke on FO-20 •3 metre long Yagi antenna who spoke on 'Satellites in education - Is there operations. An excellent talk on Mode L and S • High gain, low noise a future role?'. This topic was also covered by operation on Oscar 13 was given by David pre-amplifier Hans Groenendaal, ZS6AKV, who described Silvester. G2BFO, who continued his • 20 metres of cable the steps being taken in South Africa to presentation by further talks in one of the •A receiver/demodulator introduce spacecraft knowledge into their 'Workshop' sessions which had been • Mains power supply educational system. Richard Ensign, who arranged to run concurrently with the more • Powerful, easy to use edits the AMSAT Education News from formal items in the programme. which software for the IBM-PC, Michigan. U.S.A., dealt with the 'educational Amiga and Atari computers included useful lectures on Microsat packet aspects' of the microsats, particularly operation, satellite tracking. RS14 and System enhancements include:- Webersat. RUDAK-2 operation. Pat Gowen. G3I0R, • NO M receiver and software Friday. 271h, saw the Colloquium get off to gave an informative talk on EME, illustrated • Dish antenna feed horn an early start with reception and registration with slides of D Mallet, G3HUL's excellent • Dish antenna from 0830 to 0930. when Dr Martin Sweeting EME set-up at Norwich. Whilst reflecting radio The MET-2 brings you professional and Dr Arthur Gee. G2UK, Chairman AMSAT- signals from the surface of the moon cannot quality at amateur prices. No one UK, jointly welcomed the Colloquium be quite the same procedure as normal else provides our picture resolu- delegates. followed by a very full day of satellite activity. Pat's talk was most tion at this price. lectures and discussions. informative and interesting. Dr B Pidoux, the MET-2 : £599.95 inc. VAT The opportunity was taken to hold the AGM French delegate. spoke on ARSENE. This of AMSAT- UK in the evening, which was well project has been in the planning stage for (£9.50 post, packing) attended. The Treasurer's Report showed a several years but is now well on the way to balance of £32,427. It was announced that being launched in 1992. On the future of I C S brings you amateur radio satellites, news came out there might be an opportunity for a launch for quality and value. another UoSAT type satellite and. with during the Colloquium of several further AMSAT-UK's funds being at such a satellites in the planning stage. Many ICS provide a full 12 months warran- ty on all products sold, and we pride satisfactory level, AMSAT-UK's Committee interesting projects were put forward by ourselves on the quality of our post had proposed making a grant of £25.000 delegates representing their national satellite sales support. We are always happy towards this project_ They suggested this organisations and, even if all do not see a to discuss applications problems, satellite should have a Mode A transponder successful conclusion, there will certainly be and maintain a computer data base (2m uplink - 10m downlink) This project would enough activity in this sphere to keep satellite of all customers. This means that we be designated UoSAT F. interest going for the next few years. can inform all users of product en- hancements as soon as they are An interesting presentation was given by It has been quite impossible in these notes available. Louis Meyers. an enthusiastic satellite SWL to give anything but a very sketchy account of el who, at the AGM, gave a spirited talk on the the Colloquium. It was very well attended by ICS Electronics Ltd. activities of the Short Wave Listener fraternity delegates from widely distributed countries Unit V, Rudford Industrial in the satellite scene. He quite rightly across the world. The topics covered a wide Estate, Ford, Arundel, described how the SWL was almost forgotten spectrum of satellite activities, and the in AMSAT organisations in spite of them technical standard of the talks hit a high level West Sussex BN18 OBD outnumbering those with transmitting facilities of space technology. The Colloquium brought Telephone: 0903 731101 by a large margin. He asked that the SWL together those who represented amateur radio Facsimile: 0903 731105 54 should be given more consideration by the satellite service organisations. He thanked Dr continued on page 72 Ñ.felefeeeenneeedi

RADIO COMMUNICATION October 1990 53 m,e =xeemen neweerenweeaeur carrier is set to 3Vim +/- 3dB then the carrier is modulated with 80% AM at 1kHz. There is also a radiated susceptibility test at 2.45GHz using a 10Vim pulse modulated signal with 0.1% duty cycle. This is presumably to simulate fields which might be produced by M C microwave oven leakage. There are other tests including immunity to conducted signals HILARY CLAYTONSMITH, G4JKS from 150kHz - 100MHz injected onto power 115 Marshalswick Lane, Sr Albans. supply. signal and control lines. Herts. ALI 411LI

COMPUTER IMMUNITY. IMMUNITY OF INFORMATION technology equipment to radiated fields is covered by EMC STANDARDS UPDATE another draft standard. prEN 55 101-3. Tests FOLLOWING THE ARTICLE in July 1990 for radiated susceptibility are at the same level RadCom on EMC Standards and Regulations. and modulation as in the generic standard I have received a number of requests for prEN 50 082-1 but the frequency range is further information about certain aspects of 30MHz - 1GHz. EMC standards which are of particular interest to radio amateurs. The following information is What the immunity limits mean to only a brief summary of selected aspects of M M-3 Morse Machine 5 radio amateurs certain standards. For further information, The MM-3 has all the features readers are advised to refer to copies of the New electronic equipment sold after 1992 needed in a memory keyer, includ- actual standards. should be more immune than much existing ing 2-99 WPM speed selection and equipment but the level of immunity will not be over 8 KBytes of soft partitioned as high as radio amateurs might wish. For memory. 20 memories store variable IMMUNITY STANDARDS - RADIO length messages and total memory AND TV amateur radio purposes. immunity to field II strengths of at least 10V/m would be desirable can be expanded to 36 '

55e155 ffl555555 ffl:555,:5555,ke».45,t ~,Me45. .:.:.:5Dat5.5:5:5>:49S 1GHz. The field strength with an unmodulated amateur band, each one would be measured

54 RADIO COMMUNICATION October 1990 C= D EMC

as a separate emission and subject to the of a wavelength to radiate much interference relevant limit (provided they were not too directly: the primary mechanism is considered closely spaced - see below). Reducing the to be radiation via cables such as the mains bandwidth of the amateur receiver does not supply cable. Thus limits are specified for reduce the absolute level of this type of common mode and differential mode interference but does of course reduce the conducted emissions measured via a Line level of weakest detectable signal (in the Impedance Stabilisation Network (LISN). absence of interference). Such interference is Two sets of limits are specified, class 'A' therefore even more of a nuisance to and class B. According to BS 6527. the class operators of narrow band modes such as CW. 'A limits are derived for typical commercial The only consolation is that this type of narrow establishments for which a 30 metre band interference renders a smaller proportion protection distance is used for radiated of the band unusable! This is no consolation emissions, and they may be too liberal for however if narrowband interference happens domestic establishments and some residential to fall on a frequency which one wants to use. areas. The limits tor Class 'B' equipment are such as the 144.400 MHz meteor scatter derived for typical domestic establishments for reference frequency! which a 10m protection distance is used. The But what about interference from a source BS 6527 class 'B' limit is 30dBpV/m at 10m such as TV line timebase harmonics with between 30 and 230MHz and 37dBpV/m uniform amplitude at multiples of 15.625kHz between 230 and 1000MHz. Both limits are across an amateur band? This would be measured using a quasi-peak detector in the considered narrow band at HF but broad band measuring receiver and 120kHz receiver A MT-3 Amtor/RTTY at VHF! At HF, where a measuring receiver bandwidth. bandwidth of 9 kHz is specified, the measuring The US FCC 47CFR Part 15J regulations Terminal Unit receiver passband would encompass the for computing equipment are similar to BS Bored with simply sending packet principal spectral energy of a single harmonic 6527 and have 'A' and 'B' limits. The FCC 'B' messages via mailboxes on VHF? only and the harmonics would be considered limits are specified at a distance of 3m but the Itching to have a live OSO with as a series of narrow band emissions with equivalent values at 10m are within ldB of the someone on the other side of the each one being measured separately. At VHF, BS 6527 'B' limits in the 50. 70 and 432MHz globe again? Try Armor. Arntor is by where a 120kHz measuring receiver amateur bands while the FCC limits are 3dB far the most reliable method of HF bandwidth is specified, there could be 7 or 8 higher in the 144MHz band. It was reported in data communication, and the AMT-3 has been optimised to get the best within the measuring receiver passband at any Technical Topics (August 90 RadCom) that from the mode. With internal time. They would therefore be considered as even computers conforming to FCC Class 'B' firmware written by G3PLX (the broad band emissions because the measured limits are hard enough to 'lame' for amateur 'father' of Amtor), the AMT-3 is a th ird level would not vary significantly when the radio use. generation product from ICS, which tuning of the measuring receiver was varied. represents the definitive implemen- tation of the mode. In this case, the measurement would Generic emission standards. represent all the signals within the measuring •Compact packaging receiver passband. Therefore, in order to be prEN 50 081-1 is a draft generic emission •Comprehensive status display below the limit, each individual harmonic standard for all equipment containing active • Excellent tuning indicator would have to be at a lower level than would electronic devices and not covered by other • High tones filters to match be the case if measured with a 9 kHz receiver standards. The radiated emission limits, which most HF radios bandwidth. are only applicable to apparatus containing • RTTY transceive processing devices with a clock frequency •CW ident greater than 100kHz, are identical to EN 55 •Split screen IBM-PC driver EMISSION STANDARDS 022 (BS6527) 'B' limits. The generic emission e.1 program included •AFSK, FSK outputs standard400GHz butrefers no tolimits a frequencyare currently range specified of 0 - Household appliances etc. .Operates from 12 volts DC BS 800:1988 is the English language version below 150kHz or above 1GHz. Arntor gives virtually error free copy of EN 55 014:1987 and covers emissions from Copies of draft standards mentioned above even with badly degraded signals. equipment such as household appliances may be purchased from BSI Sales Unlike packet, it is easy to call CO and have 'live' 0S0s, and yes, there containing motors, thermostats, Administration (Drafts) at Milton Keynes. semiconductor controls or rectifiers. This are lots of Amtor mailboxes on HF - many with links to their local VHF includes any broad band emissions from audio What the emission limits mean to packet network. equipment. Conducted emission limits are specified between 150kHz and 30MHz. From radio amateurs. AMT-3 : £179.95 inc. VAT 30 - 300MHz interference power from mains It is difficult to relate BS 6527, BS 800 (£5.00 post, packing) operated appliances is measured using a conducted emission limits or BS 800 special ferrite clamp (called an MDS clamp) interference power limits to received levels of around the mains cable. Limits are specified in interference in an amateur station. I C S brings you units of dBpW (reference level 1 picowatt!). With regard to radiated limits, the BS 6527 quality and value. Statutory Instrument SI 1989 No 562 which 'B' limits should offer protection from ICS provide a full 12 months warran- supersedes some earlier Sls, makes interference to 'protected' services such as ty on all products sold, and we pride compliance with BS 800:1988 mandatory. broadcasting. but not to the amateur service ourselves on the quality of our post which is unprotected. With VHF/FM sales support. We are always happy to discuss applications problems, Computers etc. broadcasting for example the boundary of the and maintain a computer data base service area of a transmitter is considered to BS 6527:1988 is the English Language of all customers. This means that we version of European Norm EN 55022:1987 be where the field strength is 54dBuV/m can inform all users of product en- which is a specification for interference (500p Vim) at a height of 10m above ground. hancements as soon as they are generated by information technology BS 6527 'B' limits should give adequate available. protection to VHFIFM and UHF TV broadcast equipment (ITE). However, no equipment in ICS Electronics Ltd. the UK is yet required to conform with BS reception within the service area of the 6527. From 150kHz - 30MHz, BS 6527 transmitter using a roof mounted antenna at Unit V, Rudford Industrial specifies a conducted emission test, that is least 10m from the source of interference. Estate, Ford, Arundel, interference coming out of the terminals of the Protection may not be provided outside the West Sussex BN18 OBD equipment under test. whereas from 30 to service area of a transmitter or with an indoor Telephone: 0903 731101 1000MHz radiated emission tests are VHF or UHF antenna particularly if it is closer specified. The reasoning behind this appears than 10m to the source of interference. Facsimile: 0903 731105 to be that below 30MHz, the size of IT e., equipment is thought to be too small a fraction contnued on page 72 teme meememe,— ,cemeg mee me.

RADIO COMMUNICATION October 1990 55 technology for the 10GHz band, where much amateur effort until now has been directed to

either simple wideband activity or, through the REF 20.0dern ATTEN 3006 PEAK BAND advent of some commercial gear, to minority LOG LOCK narrowband activity. We hope that the first of 10dEti L-• COMB GEN CD9O M MUYe the three designs will add impetus to ATV, an OFF packet link, beacon and repeater usage in this START popular band. The module has been designed FREE' MIKE DIXON G3PFR primarily as a simple CW/FM/FSK transmitter, STOP MA SO FREO w oodstocK. Grazebank. Norley, Warrington. using GaAs technology and covering the FC Cheshire WA6 8LL COOP entire 10GHz band from 10.000GHz to CFSIEP SIZE 10.500GHz. What follows is condensed from FREO the full write-up, by permission of G3WDG and START 3.300GHz STOP 22.00GH OFFSET co-designer G.B.Beech. RES BW 3Mèlz VEIW IMHz SWP 30Ornsre 10GHZ BEAC ON FREQUENCIES The schematic circuit is shown in Fig 1. In this diagram, the heavy lines are sections of Notr Mar .5 al 10.36606.1z I mentioned, in connection with the G3WDG- Output . T 0.3680GH1.-. marker rs Shelly else printed transmission line on the PCB. The 001 multiplier/amplifier design. the use of a REF t70.0dB , ATTEN 30oB MAR 10.36600147 16.400Bm crystal of 108.009MHz as being suitable for various "wings" on the lines are matching REAP MARKER LOG O CF the beacon sub- band. What I should have elements and the elongated rectangle and the TOaR triangular elements are various types of stubs MARKER added was "for the formal beacon band which DELTA for decoupling, whilst the square with one HARPER is 10.368.800 to 10368.990MHz". The area for I0•3660Gtix NEXT corner missing (on L5) is a printed capacitor. 16 X0oBot attended personal callsign beacons in the UK PEAK is 10368.000 to 10368.800MHz. but preferably Inductors L2 to L9. inclusive, are lengths of thin wire lying on the surface of the board and NEXT PEAK in the area 10368.300 to 10368.400MHz, MA SB RIGHT soldered to the stubs and pads provided. requiring a crystal between approximately CORP MPHAHAHHHHOpHoNfAXAm '-d e9 NEXT PEAR 108.0031 and 108.0041MHz. Signal drive in the 2.5 to 2.6GHz region is LEFT

Although some European personal callsign supplied by the G4DDK-004 oscillatory' PEAK multiplier source, described in the August SPAN TOO-OUR EXCURSN beacons may be found between 10368.000 cENTR REi aé i, YEW 300kFir SWP 20 rnsec and 10368.200MHz. we cannot recommend issue of RadCom. It should be crystalled for this because of its proximity to the CW and output in the range 2.5000 to 2.6250GHz. the EME frequencies right at the bottom of the fifth overtone crystal lying in the range band. Yes, there is now EME activity in the 104.1660MHz to 109.3750MHz, according to Fig 2 Output spectrum, 3-22GHz, Showing the very low levels of sub-harmonics and harmonics. The USA and possibly soon (listening activities, at application. rising noise level Is due to the spectrum analyser, least) in the UK. There is no objection, in Drive input to the module is first amplified not the multiplier! Drive source G4DDK-004 at by IC1, an Avantek MSA0504 broad-band principle, to use of frequencies in the 'formal' +10dBm. part of the band, except that it breaks the spirit amplifier MMIC. If the drive level available is at of the bandplan and may interfere with least 10m W this stage may be omitted Fig 3 "Close-in" view of the output spectrum showing the clean output from the G3WDG-001 propagation monitoring studies involving although, if you are unsure about the drive design when driven by the G4DDK-004 source. formal beacons. In other words, please try to level, it is better to fit it. The output from the observe the bandplans. My apologies if I'd MMIC (or the input to the multiplier FET. F1, depending how you look at it!). is broadly slightly misled you by suggesting a crystal correct harmonic, and both input and filtered tuned and matched by means of L2 and L3 frequency of 108.00900MHz! output are coupled by means of PCB-pin whilst the operating bias point of the FET probes. multiplier is set, from a negative rail, by means M ORE ON THE G3 WDG001 of RV1. The output circuit consists of a GaAsFETs F2 and F3 form a cascaded M ULTIPLIER/A MPLIFIER suitably matched 10GHz line whilst L4 and the two-stage amplifier yielding about 20dB gain. 'Kitchen table hi-tech' has arrived! The printed capacitor form a series resonant The operating points of the devices are set by Components Service introduced its first "mini- circuit, (rather like an idler circuit in a means of two more pots, RV2 and RV3. kit' from August (as I write), in the form of the parametric multiplier) which 'shorts' the input Output is taken off the drain line of F3 by G3W0G-001 multiplier/amplifier for 10GHz, frequency at the drain to ground and means of a capacitor. stock reference UC42. What's so marvellous increases the efficiency of the multiplier Mentioned in this column earlier this year. about this? - what is it and what does it do? considerably. The output consists of several the design has now been fully proved by a First, it represents a new departure for the harmonics, but mainly the wanted fourth number of 'test-persons' (of varying ability) Components Service. Next, it represents a harmonic.. FL1 is a small cavity resonator filter constructing the design and ironing out the considerable advance in home construction soldered to the board, used to select the few minor problems also mentioned earlier. It was my first real attempt to use GaAsFETs and PCB techniques at such frequencies and I must say I was pleasantly surprised at how o +12v relatively easy it was to build and align such 0+8V0 equipment, even though a good deal of care o 2V5 and attention to detail is needed for success: the designers (and testers) have put in a lot of hard work to arrive at this state of affairs. Reproducibility was one of the main criteria, C12 and a reproducible design it has so-far proved to be - provided you are careful about what R6 you do and how you do it. The methods and order of construction are vital ingredients. as 8 LS lo- are the specified components. Full details are 10-5 GHz given in the comprehensive 20-page booklet 2-5 - CIA output which is part of the kit. Other items in the kit 2-625 GHz ICI -1 m1 4 imt are two boards, the main PTFE RF board and .rt tau ci (SM A a small fibreglass PCB for the regulator and ) ml TR3 L2 C2 IR? voltage inverter circuits, silver-plated (SM A) T RI resonator, circuit pins and all the other critical -• ov components: not included are the ordinary. / 47 easily obtained components and FETs. Please see the regular lists for availability/cost. (Turn to page 78 for details of this and other Fig 1 Schematic of the G3WDG-001 multiplier/amplifier for 10GHz. Microwave Components Service items - Ed].

56 RADIO COMMUNICATION October 1990 contests, and provide me with a log of what dimensions are increased proportionately. they have heard. There are always in excess The counterpoise is not connected to the of 100 different countries to be heard during mast. A metal roof can be used as a these contest weekends and it will be good counterpoise with wire radials in any number, this year to have a separate challenge to see distributed round the circle and parallel to the who logs the most countries over the 24 roof. The centre of the coax feeder is hours. This will be open to any SWL or connected to the point C: the braid is bonded amateur on a heard basis. to the mast at point H in the middle. Tuning is BOB TREACHER BAS 32525 Now for the main rules. The SSB Challenge by adjusting the lengths of the outer legs of 93 abank Road. Eltham. London will be held on the weekend of 27 and 28 the M, and the inner section. The middle set of SE9 10J October. The CW Challenge will be held on 24 radials should be adjusted at the same time. and 25 November. Both events run for 48 beginning with the lowest frequency band. It is hours. The idea is to log as many countries as desirable to isolate point H from the mast possible. Only one station from each DXCC while adjustments are being made. OCTOBER TRADITIONALLY marks the country can be logged on each of the six beginning of the winter DX season. It also bands. Entries may be single band or multi brings the start of a busy period on the bands band, but not both. Each different country where many contests and activity periods can heard on each band will count for points. viz be entered. Assuming that the peak of the a) countries in the SWL's own continent count current sunspot cycle has been reached - 1 point on 28, 21 and 14MHz, 2 points on 7 there is some debate - conditions on the and 3.5MHz and 3 on 1.8MHz. amateur bands should be maintained. The b) countries outside the SWL's own continent 28MHz band should still be capable of some count 3 points on 28. 21 and 14MHz, 5 on very good DX, as should the more dependable 7 and 3.5MHz, and 10 points on 1.8MHz. 21 and 14MHz bands. As we heard towards the end of the year. conditions on the LF The final score is calculated by - single bands - 7 and 3.5MHz - should get better. band entries: total points should be added Some would say that 7MHz cannot gel much together and multiplied by the number of better, with a never ending list of good DX DXCC countries heard: - multiband entries: heard every month so far this year. It will also the total points from each band should be be hoped that 1.8MHz will provide a little more added together and multiplied by the total in the way of DX this season, because very number of DXCC countries heard on each little to speak of was available last term. band. Moving onto contests. Dave Lawley. Entries must either be on standard size log G4BUO. is the new HFCC Chairman, and he sheets and written legibly in ink, or on along with the rest of the Committee really computer generated log sheets with 40 entries hope that more listeners will be encouraged to to a page. A multiplier check list showing the participate in this season's round of contests. countries heard in alphabetical order MUST The mast (which should be metallic) does not have There have never been too many entries to accompany each log. to be isolated [we presume this means from the ground]. these contests, but the current decline in Entries must show the full callsign of the participation is in urgent need of some fresh station heard, the station being worked, and blood. I have said many times in the past that the time and signal strength of the station THE GX PREFIX. entering a contest will only improve a listener's heard. To avoid *dubious' loggings, there is a outlook on the amateur scene, but the number minimum acceptable report of 44 on SSB and LISTENERS WILL know from the July of people entering still does not inspire any of 449 on CW. Logs should be sent to me at the Radcom that Clubs and Societies are able to us with confidence that the decline has been above address. They should be postmarked use the special ''GX" prefix (in England) to arrested. As a way of attracting greater no later than 20 November for the SSB leg. enable non-licensed people to pass greetings participation, the Committee are currently and 18 December for the CW leg. I hope the messages to other stations within the UK, looking at a new set of rules for listener event will be well supported. If there are at USA, Canada and the Falkland Islands (full contests. They should appear soon and least 20 logs for each "leg", there will be a details, including prefixes for Wales, Scotland everyone hopes that they will help encourage prize. etc, are on p6 of July RadCom). a few more listeners to try their hand at Doug Waterfield wrote with his account of his contests. While on the subject of contests, the first time on the air. He used the Vale of U M8 MK "MDX" ANTEN NA VHFCC opened all of their contests this year Evesham Club station on 3 June to pass SYSTE M to listeners, but participation is, so I greetings to G3CPT on 7MHz. He wonders if understand, still poor. WITH GRATEFUL THANKS to G3VLX who he might have been the first SWL to take Why is it that listeners in the British Isles did the translation, here is an antenna from advantage of this facility. His opinion is that are not supporting these events? If YOU have the Soviet Union which, I suspect, not many the special concession is an excellent step, a theory, write and let me know and I will see listeners have heard of. If anyone tries it out. and his Club has had correspondence from a that both the HFCC and VHFCC get your let me know how it performs, but it looks a number of SWLs who wish to know more. One comments. little unweildy and, as you will see, calls for a in particular has said he will study the RAE as lot of patience and a few helpers to assist in a direct result of this new concession. Have the getting it in place. any other listeners taken advantage of the GX HF CHALLEN GE The UM8MK is a dx antenna complete with prefix yet. Write and let me know which MY INITIATIVE for the last few years to matching. It has three components: the upper stations you have spoken to. stimulate interest in contest activity at about section which is centre fed by coax; the middle this time of the year has been to organise an set of radials: and the counterpoise at the FINALE "HF Challenge". This runs during the base. the upper section is M shaped, and the weekends of the CO World-wide DX Contest centre part of this acts as a halfwave dipole on TO CLOSE, a reminder that the Society's at the end of this and next month. I am always 14MHz. The points B and D are 6m apart. The annual 21/28MHz SSB Contest takes place on quite pleased with the number of entries elements in the middle section are connected Sunday 14 October. and the 21 MHz CW received for this event. and I hope that this to the cable braid which is separated by 10cm. contest is on 21 October. Also during the month is Jamboree on the Air - on 20/21 - year's event will be no different. For those The elements point in the direction of the two newer members who fancy trying their hand. outer legs of the M. and their lengths are cut when there is a good opportunity for non- and for the more established among us who to resonate on 28,21, 14 and 7MHz. The licenced people to pass greetings messages support it every year, the rules are reproduced actual lengths are 2.6. 3.55. 5.1 and using the special prefixes. below. 10.25mm. The antenna is 16-18m, if 7MHz is News and other items (including shack This is the seventh year of the Challenge, to be included. It can be omitted and the photographs please) for the December issue, the idea of which is to attract SWLs to listen to antenna is reduced to 12m. Conversely, 3.5 should be received here no later than 9 the bands during either leg of these big DX and even 1.8MHz cari be covered il the October.

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60 RADIO COMMIINICATION October 1990 HF TRIBAND BEAMS JAYBEAM CUSHCRA FT TONNA BUTTERNUT HYGAIN SATELLITE SPECIALS 145 Mhz Cushcraft MET A N T E N N A S KLM A3-3EL £324.00 MET 6EL.X VAGI £49.15 BNOS a n d A c c ess ories DATONG J/B 10EL.X VAGI £68.31 Jaybeam Tonna 9E.X VAGI £62.10 YAESU ROTATORS MIFJ LANDWEHR DRAE SANDPIPER 183-3EL £365.00 KLM 11EL.X VAGI POA T82-2EL £246.00 435 Mhz TB1-DIPOLE £123.00 2 MIR VAGIS 70 CMS MM3-MINIMAX £378.00 MET 17E.X VAGI £60.80 Cushcraft Tonne J/B 12E.X VAGI £77.62 20921 21EL.YAGI £47.61 HF VERTICALS 4218XL 18EL.BOOMER ... £121.90 J/B 88E.M/BEAM £72.68 215W8 15EL.BOOMER £96.00 MET Tonna 19E.X MAGI £42.44 Butternut 432-58 5EL.YAGI £20.95 KLM 20E.X VAGI POA HF2V-80 + 40 £142.00 MET 432-17T 17EL £48.45 144-19T 19EL.YAGI £89.10 HF6VX-80-10 £167.00 Jaybeam LAND WEHR 144-14T 14EL.YAGI £57.75 Cushcraft PBM24 24EL.P/B £63.94 145M GasFET P/A £119.00 144-7T 7EL.YAGI £29.85 R5-20-10M £259.00 MBM48 48E1...M/13 £52.09 435M GasFET P/A £142.00 Jaybeam Jaybeam MBM88 88EL.M/8 £72.68 PBM14 14EL.P/BEAM £83.14 DATONG VR3-20-15-10 £85.10 D8 DOUBLE BEL £40.36 LW8 8EL.YAGI £28.00 Sandpiper FL3 Audio Filter £145.54 6 NITS Tonna SP23Y 23EL.YAGI £41.80 ASP RF Sp.proces £93.15 20817 17EL.YAGI £66.27 MET 20813 13EL.YAGI £49.06 23 CMS DRAE 50-2 2EL.YAGI £34.40 20809 9EL.YAGI £33.12 Tonna 6 Amp P.S.U. £84.99 50-3 3EL.YAGI £42.95 20089 9EL.PORTABLE £35.19 20623 23EL.YAGI £32.29 12 Amp P.S.U. £113.10 50-5 5EL.YAGI £64.40 20655 55EL.YAGI £49.27 24 Amp P.S.U. £163.42 Mlsc Cushcraft Jaybeam VHF WAVEMETER £35.94 ZL7 7EL.ZL VAGI £15.95 A50-6 6EL £182.00 D15/23 15EL.DBL £68.31 ZL12 12EL.ZL VAGI £38.00 Tonna B.N.O.S. HB9CV 2EL.BEAM £4.25 Sandpiper 20505 5EL £50.71 20TURN HELICAL £47.30 LP50-10-50 £151.80' LPM50-10-100 £257.60 Jaybeam 2 MIR VERTICALS 28TURN HELICAL £55.00 4Y/6M 4EL £58.00 LPM144-10-100 £225.40 MET 13 CMS LPM144-25-180 £259.35 4 MTS 144GP GROUND PLANE .. £17.80 Tonna LPM432-10-50 £225.40 Jaybeam 20725 25EL.YAGI £43.47 MET LR1 4.3d8 CO-LINEAR £45.31 YAESU ROTATORS 70-5 5EL.YAGI £56.55 Cushcraft 70 CMS VERTICAL 0250 BELL TYPE £78.00 70-3 3EL.YAGI £37.25 ARX25B RINGO RANGER £43.00 F/G CO-LINEAR £39.95 G400 BELL TYPE £139.00 Jaybeam G4DORC BELL TYPE £169.00 4Y/4M 4EL £48.18 G60ORC BELL TYPE £219.00 Full range of coax plugs, masts. W ESTER N ELE CTRICAL G5400B.AZ/EL £375.00 brackets etc etc. DIS TRIB UT ORS LT D Phone your order for same day PLEASE SEND LARGE SAE FOR Maesbury Road. OSWESTRY, Shropshire SY 10 8EZ despatch. FULL PRICE LISTS. Phone: 0691 653221 Fax: 0691 670282 in. Prices do not include carriage.

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RADIOCOMMUNICATION October 1990 61 C O N T E S T N E W S

HF NFD Report - continued from page 11

t',C C.C;flAps, Gaj o It is no coincidence that despite correct transcription errors. That the differing locations, Triple A is. callsigns known to have either being just outside London close to been copied wrongly or to have the M25/M3 junction and Marple been written down incorrectly. For located some 180 miles North on example, GOAAA logged on one the Yorksil.pancs border near band with a high score would Todmorden, the two groups had indicate a possible portable almost identical scores on three station and it should be easy to bands (1.8, 7 and 28MHz), were check through the other band logs within 1.5% of each other on to find GOAAAJP. The original combined 3.5 and 21MHz scores, error could then be rectified. and only differed on high scoring Computer logging eases the 14MHz by an amount which gave problems and several pieces of Triple A the edge this year. software are now available. K1EA's CT is a sophisticated real-time system mainly for use ANALYSIS with the big CO and ARRL An analysis of the 363 operator's contests, although it can be callsigns listed provides some adapted for other events. interesting information. There G3ULT/P used a new program were 177 G3 and before. That is, developed by G3WGV, one of the Thames Valley ARTS, G3TVS/P with the right sort of transport for a field day. licences issued up to 1971. 124 operators. LOG is again a real- Is that a loaded whip on the left of the engine? L to r GODAS, G3GHS, G3JIP, G4+3 licensed between 1971 to time system but specifically G3ENI, G3LHN, G30GP, and G3LOP. 1984. and 62 GOs licensed from written for RSGB HF and VHF 1985 onwards. It is encouraging contests. The quality of logs PlIOTOGRAPt. 631101.1 to note that there are plenty of produced was excellent. G4+3s to move over into the top LOG is also the name of a places with a good reserve of program compiled by Duncan GOs to follow. Monro, not licensed but the son of What is. perhaps, slightly G4KGK. The documentation disappointing is that only 2 GO provided with the software is very callsigns were among 70 professional and duplicate checks operators listed in the top 20 are carried out as callsigns are Open section entries. One hopes entered. that this is not an indication of the Duncan has also submitted a lack of competitive spirit in the suggested standard for the Data newer generation of Amateur Interchange of Contest Log Radio operators, because it is just Information and this will be most this spirit which drives the hobby, useful for future H FCC whether it be contesting. DXing or consideration. Several groups any of the other many facets. have enquired whether Maybe the younger element is submission of logs on diskette is missing. acceptable and whilst it is not at present. we are beginning to LOG KEEPING investigate the possibilities. Racal Amateur Radio Club; G3RAC(P. L to r (seated) G4CXT, G3PGM, G3YGR The presentation of logs has (standing) G4FRE, GlJAJ, G3TZU. improved considerably over the RULE last few years and the HF CHANGES Contests committee welcome this. It always seems such a I requested comments on the waste that after so much effort is proposed change to the scoring expended in organising and system to allow a multiplier to be operating a Field Day station, used. There was a most emphatic points are lost through poor "NO" to any major change in the administration after the event. existing rules and apologies are in Abbreviated logging is perfectly order for ruffling so many acceptable in order to save time feathers. It just goes to show how and effort. A four-digit time need popular Field Day is. not be recorded for each contact provided that the hour is written for the first and last contact on IN each page, and for each change of hour or band. Similarly, a note CONCLUSION on the band cover sheet saying Time and space has once again "Assume all reports are 599 limited the contents of this report. unless otherwise stated" would Writing about computer logging alleviate having to write the report did little to ease the pain of re- for each contact. In fact, this composing and re-keying two helps to highlight non-599 reports. thirds of it, having erased the G4 HRC,'P in the field. It is also accepted practice to initial article by accident without

62 RADIO COMMUNICATION October 1990 CONTEST NEWS

back-up or hard copy. What a NATIONAL FIELD DAY 1990 - RESULTS way to learn! Once again my thanks to all RESTRICTED SECTION those who gave words of encouragement, they are always Pan Call Group 050e 1.8 3.5 7 14 21 28 'Total appreciated. Band adjudicators I GOAAArP THREE A'S CG 1044 I 112 611 794 884 452 766 4619 were 3410M, G3MCX, G3FKM. 2 G3VMAriP MARPLE CC 1034 1132 505 911 844 54-3 752 4587 3 G3GRS4D GRAVESEND RS 958 1100 634 855 722 382 632 4325 G3HCT, G3LET, G3KDB and 4 G5BKiP CHELTENHAM ARS 964 712 572 715 974 290 806 4069 G4JKS. Special thanks to G3UFY 880 510 819 926 252 616 4003 5 GW8OTrP RED DRAGON CO 997 for collating checked scores and 6 G4FRS/P FARNBOROUGH & ORS 727 740 476 783 503 189 502 3193 7 G3TM NP LINCOLNSHIRE POACHERS CG 741 856 304 751 605 192 436 3144 producing the final tabulations. 8 G6UOrP STOCKPORT RS 660 968 399 437 480 269 536 3089 Field Day 91 is just a few 9 G3GLUP TOLLESBURY CG 711 704 454 602 510 389 320 2979 10 G3WSCrP CRAWLEY ARC 647 792 521 823 376 100 330 2942 months away, see you there. It 048FINP BRACKNELL ARC 696 606 436 872 408 226 310 2858 12 G4FOXP MELTON MOWBRAY ARS 594 876 265 548 3.40 275 518 2822 13 G3ZME.P TELFORD & OARS 639 584 356 783 522 142 404 2791 14 G3TRF MAIDSTONE YMCA ARS 599 664 318 528 484 229 566 2789 15 G4ADM.P SUTTON & CHEAM RS 646 812 419 682 392 154 296 2755 CO M MENTS FRO M 16 G4AYm P GLOUCESTER ARS 603 782 281 686 440 195 326 2710 VHF CONTESTS 17 GM3BSO.P ABERDEEN ARS •A• 660 624 409 589 727 248 68 2665 CO M MITTEE CHAIR MAN 18 GOFDX,T. CENTRAL LANCS ARC 550 766 275 433 357 267 480 2578 19 G3TVS,P THAMES VALLEY ARTS 565 670 326 400 574 196 380 2546 OK so old windbag isSpOuting OTI again, but 20 G5LK,P REIGATE ATS 595 472 212 458 625 310 434 2511 this tune Ithink that I have got good reason. 21 G4CRA,P COLCHESTER RA 582 458 404 840 331 104 356 2493 22 G3CARP CHILTERN ARC 511 898 222 544 376 22 350 2412 My wile (GOESO) and t have recently 23 G3FV/LP SOUTH MANCHESTER RC 574 528 397 508 546 67 348 2394 been doing some work on VHF Field Day 24 GW4CCrP SWANSEA MIS 537 658 327 398 490 149 336 2358 entries and it appears that some contest. 316 456 740 513 214 74 2313 25 G3DIT'P SOUTH HANTS TS 592 ants think that rules are to be bent if not 26 GM3LILG.P GLENROTHES & °ARC'S" 487 860 408 266 509 35 224 2301 ignored altogether. My intention is to en- 27 G4ARN,P NORFOLK ARC 568 296 221 716 484 179 336 2232 sure that everybody who enters a contest 28 G3FiSCP ROYAL SUTTON COLDF1ELD RS 587 424 765 372 184 440 2165 29 GOCELP TORBAY ARS •B• 558 338 195 775 500 150 176 2134 has just as much chance lo win as the next 30 GM3NIG)P WINDY YETT CG 504 554 323 545 47! 201 2094 person, in that t will endeavour to enforce 31 G8GGP BLACKPOOL & FYLDE ARG 423 574 399 382 178 205 332 2070 the rules equally on all stations big and 32 G U BlIP WINDMILL CG 443 478 280 552 158 98 408 1974 small, contestants who are me mbers of 456 36 606 5.83 79 1960 33 G4HRDP HAVERING RC 507 VHFCC are always reminded of this and t 34 G4WSMI. WESTON SUPER MARE RC 450 376 254 604 370 192 92 1888 290 644 389 187 312 1822 have stated at com mittee meetings that 35 G3WKSI, WEST KENT ARS 435 VHFCC members have to be 'squeaky 36 G4FUHrP SCUNTHORPE ARC 11 495 428 694 467 145 12 1746 37 G4COUrP STUMBLE CG 499 340 608 433 197 162 1740 clean'. I was inspected myself during VHF 38 G4ECTiR CHESHUNT & °ARC 532 291 626 443 307 12 1679 Field Day. 39 G4S,IMrP RIPON & OARS 367 264 209 421 199 203 318 1614 The sort of things that I will not tolerate 40 G4PG W/P NORTH DEVON BINDER TWINE CG 309 566 sa 450 153 95 224 1576 are blatant breaking of rules, such as: 41 G4BLVP PLYMOUTH RC 'EV 415 335 306 485 256 84 1466 Setting up of stations prior to 24 hours 42 G3CMH.1. YEOVIL ARC 317 456 80 490 274 2 1302 43 G4JSrP DARWEN ARC 334 309 344 223 131 290 1297 before contest start time. A disqualification 44 G3HJFP VERULAM 291 216 99 431 108 82 332 1268 offence. 45 GM3VEY,P ABERDEEN ARS '6' 359 146 715 212 130 48 1251 Non registration of station. Disqualified. 351 1143 1143 46 G3GX1.1, ECCLES & OARS Failure to meet posting deadline, two 47 GOBRC ,P BREDHURST RATS 280 827 827 stations will be disqualified for this, one 01 48 G8CArP AXE VALE ARC 170 176 24 339 147 56 742 them would have been in a high position, 49 G4GZO P G4GZO CG 114 146 123 298 567 what a waste of effort' Registering for one section and entering another, was this in error or a ploy, or is it OPEN SECTION that they just did not read the rules. It is obvious that many organiSers did not read the rules, and their groups will suffer Pan Cell Group OSOS 1.8 3.5 7 14 21 28 Total the consequences. 1 G3VER4. VERULAM 'A' 1032 984 607 952 698 468 774 4483 Some computer printed logs were still 2 G4ALEP ADDISCOMBE ARC 1017 930 380 821 1064 406 526 4127 3 G3RACIP RACAL ARO 995 894 379 812 946 530 554 4115 left as continuous listing, this is bad enough

4 G3NUA.P ToReAv ARS 'A 991 780 568 743 1027 428 476 4022 but they could have at least got the pages G4FNUP DOWNS CG 930 888 471 626 940 451 442 3818 to line up with rht perforations. They will 6 G5LO'P OXFORD & OARS 906 866 368 602 1099 417 502 3764 either lose points or maybe face disqualifi- READING 6 DARC 822 926 53: 602 621 293 724 3697 7 G3ULTP cation for the band in question, a com mittee G3PRC.P PLYMOUTH RC 'A' 899 810 430 868 742 429 392 3671 descision. 9 G3ZRSP HULL CG 874 902 361 705 835 351 508 3662 lo G3WASrP LICHFIELD ARS 805 836 513 687 563 411 560 3570 Some groups did not use a summary

I I G3SFG.P SOUTHGATE ARC -A' 860 850 392 700 696 409 512 3559 sheet, a disqualifying error. 12 G3TBKP EAST NO US CG 790 1000 448 588 530 383 558 3507 Other groups did not even use a cover 720 970 468 811 321 150 648 3388 13 G3UJV/P VERULAM 'B sheet for each band, also a disqualifying SCUNTHORPE ARC -A 818 862 382 493 692 484 432 3345 14 G3PDUP offence. (The station who sent in his cover 15 G3XRFP ILF0F10 RSGB GROUP 663 762 291 822 490 204 370 2939 sheets by separate letter is OK, entry ac- 16 G3ASRIP EDG WARE & DRS 664 808 491 622 433 209 360 2923 17 G3CNXiP GRIMSBY ARS 645 710 478 675 445 137 410 2855 cepted).

18 GMOADX,P KILMARNOCK & LOUDON ARC 672 720 360 665 615 266 182 2808 After more than seven hours working 19 G3YRC/P GREAT YARMOUTH & DARC 570 800 295 676 385 136 482 2774 through the night sorting the entries into 605 864 466 590 471 61 296 2748 20 G3KUE.P PRESTON ARS order,band.section, marking entries with 21 G4GCT ,P NORTH BRISTOL ARC 681 420 407 789 665 127 314 2722 serious errors, it becomes difficult to cor- 22 GOM WPP CHELMSFORD ARS 613 776 252 784 504 28 268 2612 rect all the minor errors let alone the more 23 G3NWR'P WIRRAL ARS 602 528 295 861 598 116 106 2414 serious Ones. In general the entries were 24 G413PrP SCARBOROUGH ARS 506 734 201 644 399 145 282 2405 25 G4VRSJP AYLESBURY VALE RS 494 806 315 459 350 144 288 2362 OK, but about 20% had minor errors, 10% 26 G3VGGe BROMSGROVE & DARC 599 356 333 587 574 28 472 2350 serious errors that have or could cause 27 G3UES P ECHELFORD ARS 516 104 673 466 91 146 680 2160 disqualification. GREENOCK & DARC 520 276 262 600 513 100 376 2127 28 GM3ZRCrP Please gentlemen and XYLs atter con- 29 G5FISP GUILDFORD & DRS 539 802 684 172 456 2114 testing for 24 hours wouldn't it be more 30 G4ATH P THORNTON CLEVELYS ARC 482 496 185 696 299 141 288 2105 satisfying to know that the entry had been 31 G2LWil, CRYSTAL PALACE & ORO 462 572 221 511 333 170 286 2093 32 G3SDC.P LEICESTER POLY A' 673 2070 2070 submitted correctly, than to find that all your

33 G3NFC,P BURTON & DRS 439 396 289 446 394 105 364 1994 weekend had been to no avail. A full break- 422 820 1061 II 1892 34 GsAHG.I. SHIREHAMPTON ARC down will be made after adjudication which 400 400 8 420 325 264 394 1811 35 GM4I MS& STIRLING a OARS lakes place in the beginning of September. MAIDENHEAD 6 DARC 282 970 134 94 54 53 472 1777 36 G31ArK7CP G4DEZ 37 G6LX,P SURREY RCC (CROYDON! 524 1678 1678 38 G4RSErP SEARS CG 415 324 177 356 279 211 270 1617 39 G3R1RiP LEICESTER POLY 13 486 1561 1561 (Obviously the VHFCC Chairman has G4EKT9 HORNSEA ARC 344 460 42 548 164 69 256 1559 strong views on this subject. Members 41 G3B-SN.,P CLIFTON ARS 'B 425 1398 1398 %rob Ninolorly strong viets's on the use of 42 G5UM P LEICESTER RS 421 1255 1255 lisqualification are invited to write WELWYN HATFIELD ARC 344 1194 1194 43 G3WGC.P directiv to Bryn 1.1ewelivn.G4DEZ, I/O 44 G6A.I P BARNSLEY & DARC 310 28 734 346 1112 Surah it Southend:Essex, SS2 411U, 45 G3GHN P CLIFTON AIRS *A' 166 508 508 46 G3LRS P LEICESTER RS13' 163 441 441 Ed,/

RADIO COMMUNICATION October 1990 63 C O NTE ST NE WS

RULES RESULTS

IF C U M U L A TIV E 70 M H Z FIX E D ST A TI O N C O N T E S T M A R C H 1990 S U M M E R 1.8 M H Z

C O N T E S T S 1991 R U L E S Lack of publicity in the form of specific rules, apart from a brief mention in Jan 1990 issue C O N T E S T of Radcom did not help this contest. nor, combining it with the last 70MHz cumulative A comment from one entrant that "a lot of 1. General: session. Apologies from all at the VHFCC for the ommissions and error. The entries were Europeans - where were the G's ?" does The principal aim of these events is to offer well down from the previous year, just like general activity on the VHF bands. Trying to put not seem to have been borne out by the more contests in the years calendar obviously does not work. Radio conditions were newcomers to contesting an opportunity to very considerable increase in the number modest with deep OSEI and a noisy band. South of England stations G4RFR and G3NAO "get their feet wet". Old Sweats taking part of UK and overseas stations who sent in managed CW contacts with GM4AFF for respectable distance OSOs. The latter station (who are more than welcome, of course!) entries this year. It was suggested that an having 45 Watts of CW to a 7 El yagi. There were several stations out /t) but obviously could are asked to bear this in mind should they earlier start and finish would be a good not enter the contest. G8EIK/P checklog proved lobe useful, thanks. Stations from G, OW. run across an operator who lacks their own idea. Many feel that this is a friendly and GM. GJ. GI were active. Congratulations to the Flight Reluelling ARS, G4RFR, in winning confidence, experience and expertise. enjoyable event but also that there seems the open section and G3NAO, the single operator section. Certificates also go to the There are five sessions on each band, the to be a relative absence of 04 and GO runners up. best three of which will count. Each band is entries. How about more interest from the Gel-1H! regarded as a separate contest, and en- newer licensees next year? trants must operate from the same location G3FKM. for every session on a particular band. OTHER / MULTI OPERATOR SECTION.

2. Dates and Times: POS CALLSIGN PIS OSOS MULT LOC BEST DX KM U.K. SECTION 1 G4RFR 23909 74 43 (090AS GM4AFF 695 1.8MHz - Mon 7 Jan, Tue 15 Jan. Wed 23 2 G4ZAP 12913 72 37 109313C G.I1TJP 432 PosCallsIgn Score Antenna Jan, Thu 31 Jan, Fri 8 Feb. All sessions 3 G4LNV 2970 33 22 1091MK GOEHV 391 2000 - 2200GMT. 1 G3TBK 656 1,2 wave dipole al 7511 SIN GLE OPERATOR SECTION 3.5MHz - Sun 6 Jan, Sat 12 Jan, Sun 20 2 GONAA 642 Inverted.V at 8511 Jan. Sat 26 Jan, Sun 3 Feb. All sessions 1 G3NAO 9207 49 33 10911-11 GM4AFF 654 3 G4HTD 622 1,2 wave dipole at 6011 477 1600 - 1800GMT. 2 G3UKV 7650 49 30 1082RR 0M-4 AP F 4 G3WGV 573 250h doublet al 6011 3 GM4AFF 1474 12 8 087 VA G4RFR 695 5 G4RFR 571 lt2 wave dipole at 5511 4 G4NKS 1035 17 is 1081XU GBEC1 225 7MH2 - Sat 5 Jan, Sun 13 Jan, Sat 19 Jan, 6 GOIVZ 545 Butternut vertical Sun 27 Jan. Sat 2 Feb All sessions 1000 - 7 G40GB 501 26411doutget at 5011 1200GMT. 432 MHZ FM CO NTEST 1990 8 G3VYI 476 1321I c 1. at 3511 26011 doublet at aott 3. Frequencies and Mode: What a change from last year when only one station entered, we gave this contest another 9 G2MJ 470 10 G3YAJ 469 1/2 wave dipole All contacts to be made between the limits chance and il was worthwhile, although still not an overwhelming response. Conditions 11 G4FRE 466 HF6V Butternut 1835-1865. 3520-3550 and 7015-7040kHz. were average. Congratulations to GWOMGR/P and G4NVAJP. Note G1ATZ please use 12 G3JJG 457 1/4 wave inverteevee CW only. standard size forms in future, your little ones are quite sweet, but next time . . G4DEZ. 13 G2AFV 452 1(4 wave inverted veo 4. Eligible entrants: 14 G3YLC 446 22011c fat 4511 15 GOJNZ 442 1r2 wave dipole All entrants must be fully paid-up members POS CALLSIGN PIS OSO's LOC BEST DX 104 16 GM3NCS 436 Folded dipole at 4711 ol RSGB. Single-operator entries only will 1 GWOMG1I,P 254 58 I083JA G1H WY 309 17 GOIDE 424 40m loop be accepted. 2 G4NVA,P 218 47 1093EH G1RPA 303 3 G1 ATM' 97 41 I093AD GW6YONM 155 18 GM3UM 415 13611 end fed Zepp S. Contest Exchange: 4 G5UM 67 21 I092MP GW6GXV/P 185 19 GW3JI 412 Centre fed 15011 5 G4WYJ 43 21 I091VL GWOMGFUP 279 20 0364011 407 26411 centre fed Send RST + Serial Number, commencing 6 GOGZI 43 19 1093AF GW7GXV/P 134 with 001 tor each session Stations may be 7 G6FPX.P 29 19 1083P1 GOMD09 92 21 G5MY 401 1/4 wave contacted world-wide, and may be worked 8 G6W00 22 8 1091UR GINVA,P 22 22 G30XC 396 Non•resonan1 dipole once in each session for points. No points 9 CADDY 5 5 1090JP 37 23 G4ZCR 394 L.w volh counterpoise will be lost if a serial number cannot be 24 G3JSR 349 I 3211 long wire Thanks for checklog GOCL obtained from non-participating stations. 25 G3BPM 344 30011 long wire 26 G3KKOrP 343 G5RV at 2011 6. Scoring: 432 MHZ CW CO NTEST 27 0311K 335 W3DZZ strapped. Each completed contact scores 3 points. Very poor activity on thiscontest, and complaints about length of contest, time. poor activity 28 031-1K0 332 INo l staled) The total score for each contest is the sum and conditions. I may well be able to do something about the length and the time. VHFCC 29 G3GMS 313 6011 end fed at 3011 of the best three sessions on that band. will review those for next year, but over activity and conditions I am afraid that I really have 30 GOCGB 292 50m doublet Duplicate contacts during any session must no control' Congratulations to the winners and the runner up and to all those who 31 G3GMM 265 1.8MHz inverted-vee be dearly marked and not claimed for points. persevered. 32 G4UZN 245 Long wire Any unmarked duplicate contact for which G4DEZ 33 G3ZRZ 214 Modified G5RV points have been claimed will be penalised 34 GW3G WX 208 Halt wave 33 points. POS CALLSIGN PIS OSO's LOC BEST DX KM 35 G3Z13U 205 18911 end ied at 2011 36 G4BLIO 204 13011 inverted eve 7. Logs: I GW4MGR,P 288 36 083JA PE1ALA 537 2 GOCLP/P 163 21 093AG PAOW WM 494 37 037:GC 145 13214 wire Use of RSGB HF Contest Log and Cover 3 G4BVY 96 12 08210 PAOWWM 466 38 03110 78 3.5MHz dipole (Declaration) Sheets is preferred. Only one 4 G4WKN 86 16 09200 F6HSL 248 cover sheet is required for each band. 5 G4ERG 79 9 093SR PE1ALA 375 (Samples al Log- and Cover-sheets have 6 031L0 32 6 081V0 G4P10 224 been printed in various RSGB publications. OVERSEAS SECTION and may be copied for individual use. Larger quantities may be purchased from HO. PosCallsign Score Antenna Anyone in difficulty is invited to write to C ONTESTS CALEN DAR RSGB VHF CO NTESTS 1 El9FK 302 Inverted veo d:pole G3UFY. OTHR. or any other HFCC mem- RSGB HF CONTESTS 2 OK I KYY 284 2X41M corner dipole ber.) Computer-produced logs are wel- 30 Sept OF National Rnei 30 Sep 50MHz CW (Jut 90) 3 YL2MB 232 Vertical dipole comed if formatted to the above standard. 4 Oct 2rd Mitt Cumulative (Sep 90) 6 Oct 144MHz CW Cumulative 4 ON4K10 224 Long wire al 3011 8. Address for Entries: 12 Oct 2n1 28tihts Gunge, POP 90) 8,7 Oct 432MHz • 24G1-12 SWL IARU 5 OH1TN 218 Vertical 14 Oct 21/28.14 Phone Contest Pile 90) (Avg 90) 6 OK3TWJ 217 Inverted veo HF Contests Committee do G3MC X. 86 21 Oct 21MHz CW Contest (May 90) 7 Oct Cumulathes (Jul 99) Peckham Road. London, SE15 SLOE 7 PA3AMA 175 Doubler 10 Nov Club Cabs Contest (Aug 90) 9 Oct 1 3 & 2-30Hz Cumulatives (Aug 8 UV3DRU 165 Full wave at 50m 17 Nov 2nd 1.8MItz Contest (Sep 90) 1991 99) 9. Closing Date for Logs: 9 UC2RZ 141 Full wave 5.1110 7MHz LF Cumulanve (Oct 90) 17 Oct 432MHz Cumutawes (Aug 90) 10 LA2UA 129 Long wire (80m) All entries must be postmarked no later 6 Jan 3.5MHz LF Cumulative (Oct 90) 21 Oct 70MHz CW (Aug 90) 11 011.41-IX 126 Dipole than 25 February 1991. 7 Jon 1.8MHz LF Curnuialive (Ott 90) 25 Oct 1-3 ti 2-3GHz Cumulatives 12 HB9NL 116 No specified) 12 Jan 3.5Mitz LP Cumuktlive 22 Oct 144MHz CW Cumulative 10. Awards: Remember that each band is 134w 7141z LF Cumulatrm 2 Nov 432MHz Cumulative 13 0M2BPG 65 40m long were a separate contest! A Certificate of Merit 15 Jan t .8Mitz LF Cumulative 3,4 Nov 144MHz CW 841 MaeonielSG8 14 UC2WCJ 48 Hall wave sloper will be awarded to the station with the 15 UV3AFB 45 Full wave 194w 7MHz LF Cumulative (AM 90) highest score from the best three sessions 20 Jon LP Cumulative 10 Nov 1 3 2.30Hz CurnLeabves 16 RW6AF 43 Dipole on each band. Additionally, a Certificate of Z3 Jan 1.8MHz LF Cumulative 11 Nov 144MHz CW Cumulative 17 UB4IBF 24 Inverted vee Merit will be awarded to the entrant having 26 Jan 3.5MHz LF CUMUlethe 2 Dec 144MHz AFS/FltetVeM. (Aug 90) 18 Y22PE 16 20m long wire the highest aggregate score from all three e Jan 7Milz LF Cumulative 4 Dec 432MHz Cumulatives contests combined 31 Jan 113MHz LF Cumulative check logs were received from GOAFH, The adjudicator would welcome checklogs 2 Feb 71.012 LF Cumuntive %to oil been SWL section le every VHF GW4KV,J, UZ3OWX. Y39.15.13, Y39•16-B, congest even not mentioned in rules from entrants (for their non -scoring ses- 3 Feb m et LP Cumulative and Y52-15-13 to whom goes the HFCCS sions) and from SWLs and non-partici- 9 Feb 1.814Hz LP Curruttive DOW of pelluilkti te rules in Rectal) tyre thanks pants. 23-24 Feb 7MHz CW Contest (Sep 90) shorn in parentheses

64 RADIO CO M MUNICATION October 1990 SPECTRU M ANALYSIS continued from page 22 SM7FWZ (J077), OH1AF, July. The 25th produced countries (not me, 1 was on SM7BOU, LA1K (JP53). PE1LAU/MM (JN12), IK1EGC holiday!). The main ones being SM2EKR (KP03), LA1JU, AND (JN35), F/PAO1XN/MM and the expedition to 70 and TI9. OH5LK (KP30). Other goodies V51KC (JG77GI), while the 28th DL8CM/ZS1 from Penguin Is was heard were ES2RJ (K029), gave him some OEs, DLs. LAs also quite rare. He counts for a SWL SP2NCJ, ES2WX, HG3DX, and GMs via Aurora. From North new island for the IOTA chasers, HG7BT, OK2ZZ, HG2NP (JN97) of the Border he found GMOHBF, but there is just a hope that BOB TREACHER BRS 32525 and SP9EWU (J090). GM3UKV/P (Jura - 1075), DXCC credit will be given, too! 93 Ehbank Road. Eaharn, London To add my own personal GMOBPY, GSOMVZ (the GM Let us take our customary look at SES IQJ account, I was also pleased to equivalent of GX - see my other what our reporters heard, starting have been "tipped off' that this column on page 57) and with 28MHz. The band had been year's peak was expected to be GM4CXP. The 31st gave him a suffering a bit (like us humans in IT'S A TOSS OF THE COIN to about lunch time on the 12th. My new country in the shape of this heatwave of ours!). but there decide where to begin this month. log also reads like 14MHz when it Y021S (KNO5) heard at 1819. The had been the occasional good My trusty reporters tell me that is wide open to Europe. I heard 2nd saw another widespread opening, mainly to Africa. ZS8MI HF has been good. 144MHz has many of the Scandinavian opening when David logged had been heard, together with the produced some Sporadic-E. tropo stations which Mick heard, to IK1LBW, SV1AB, OH2BC, 708AA expedition. Other and MS, and 50MHz has had a boost the squares tally by six, but DF1NP, 0E8PTK, ISOAGY, callsigns noted were N3C RH/TJ, few good days too. others heard included LA3B0 FC1JUC and OZ4EM. The 12th TK/PA3EBT/P, TR8JLD, (J059), LA9ZV, El8EF (J054), added TF to the log - he was 57/9 DL8CM/ZS1, 5V7RF and OH2BZY (KP20), SM4HFI in Harrogate - and IT9TVF 7Q7LA. 1441MHZ: (JP70), SMOERR (J089), LA1JU, (JM68). David's squares tally for 21 MHz provided TI9US and 0E3OBC. YUlEV, IK1MTZ this year on the band was 72 in MICK TOMS, BRS31976, the 708, but this appeared to I4YNO. 15JUX, HB9SKD. 34 countries. provided a goodly list of DX which have been carrying most of the 0E8HWO, OK3LO, G4PIG/TF Your scribe was on holiday in I had missed due to holidays in DX during the time under review and HG5PT. If any reader can July so the log is bare. 50MHz July. He caught a shortish as most reporters mentioned a provide the squares of the in August produced IK3PDA Sporadic-E opening on 14 July, good many exotic callsigns. following stations: OH1AF, (JN65) on the 1st. The 2nd logging IWOBCF (JN61), IW8BZN LA1JU, HG3DX, HG7BT. provided PE1LAUMM (JN11), 14MHz had provided some (JN70), IW8BPA (JN70). IOUZF good DX, too, as you would HG5PT. SP2NCJ, SM7BOU, and SM6HYG (J058), SMOCHH/6 and IWOOLV (JN63). Following ES2WX, we would both be most (J057), OHOBNP - Aaland IS expect. TI9CF. 3C1EA. 5U7NU that, the 15th gave him some pleased. (KPOO), SM7CMV (J075), and 708AA were mentioned. tropo to GM4IPK (IP90), HB9MY Other highlights noted were (JN47), OZ1KSW (J056) and A43KM/0, FG4FF, KA3HMS/KH3, LA9JFA (J059). The 21st 1990 HF Table J39CO, DL8CMIZS1, 4K4/EK9JG provided a good tropo opening to Station DXCC 28 21 14 7 3.5 1.8 Total (Zapadnyy Kamennyy Is). 5HOC the East when he logged SP1HLE (Rosario Is) and 5Z4BI. BRS25429 259 176 191 228 172 110 51 928 (J073), several Y2s, SP3RBF, BRS8841 255 184 203 207 137 107 49 887 As you would expect for this SP2DDV (J093) and OK5A. Mick BRS25209 74 104 118 126 83 43 548 time of year, the LF bands have BRS1066 158 67 105 125 91 43 37 468 remarks that the weekend of not produced too many DX 14/15 July was one of the best of BRS52543 165 66 68 79 120 96 34 483 G1 VDW 131 38 83 87 40 20 1 269 signals, but for those who are the year. The Es on the Saturday EIRS32525 116 56 34 64 36 23 - 213 really keen on monitoring those was late in the evening, the first BRS40292 29 17 31 33 24 8 142 frequencies there is always stations heard were at 1940 and BRS92755 75 75 75 something of interest. 7MHz also I still need more suppport for this table. How about an entry from YOU!, the last at 2020. He understands came up with DL8CM/ZS1, as that ISO and 9H were also well as C56/0N7EH, FT5XA, audible, but not at his 0TH. OH1LU (KP01), SM3E0Y PJ2/PA3CWQ, VP5JM, XT2BX. GM4IPK was not too strong but 432MHZ (JP81), EB5EIB (legal?), LA9ZV YI1BGD, ZD8BOB, 708AA who had a monster pile up. Conditions (J059) Italians and CT1LN for MICK PROVIDED me with was very QRV on 7065KHz were good throughout the day good measure. 4 August saw between 2000 and 2200, and with HB9MY at 0847. El6ARB/P something to say about this band for the first time for a very long LA6QBA/P operating from his 9V10K; while 3.5MHz. although at 1128, EJ3GE (Da!key Island) holiday home in JP61, while at plagued with static crashes at this at 1228 and Scandinavians from time. He caught a good tropo opening on 2 August when he 1732 Z23J0 was 55. The 5th time of the year provided FR5DX, 2100. After that came the provided a good Italian opening YC6KOS and 7P8DX. Robert excitement of the Aurora on the heard LA8AK (J038), OZ1KLU (J046), LA1YCA (J038), from 0738 to 0855, and then at Small BRS8841, Reg Akehurst 28th when he heard GMOBQM/P 2036 G4ODA/TF was heard for a BRS25209 and David Whitaker at 2305, followed by other GMs, LA9RAA (J028), LA3DV (J048). LA3VW (J048). SM60E0 new country. SV1DH (KM27) was BRS25429 all mentioned 18MHz GIs and OK2BXE/P, OZ5BU, the best on offer on the 6th. The (J058), SM4KYN (J079), AND in their reports. Between them OK1K0H/P, OZ1FM and LA8RV. 11th gave another new country in LA9JFA (J059). they heard DU1KK, FG5ED, Back to tropo, where he was the shape of HBO/HB9QQ. He FM5EJ, 0A4CAN, OD5QX, pleased to be in the right place at was 59 at 1729. After that, at S79MX, TA2/VE3NSK,, TI5GLF, the right time to log LA5JEA in 70MHZ 1808, LUIEIYY0 was 57 and he TI9CF, V29A, VP2EHF, VP5/ J018. was almost fully quieting on FM at W2AH, Z21CF. ZC4CZ and Moving on still further, Mick THIS MONTH, we even have a 1833! Several HB9's were heard 5T5FA. enjoyed himself with this year's mention of this band too. Mick during the Perseids for another Perseids Meteor Shower around logged GJ7DGJ/P (1N89), new country. 12 August. Activity started on the GD4I0M/P (1074) AND GI4ONL All in all, a good few weeks on FINALE 3rd when he heard YU2CBE. This (1074) on 8 July. VHF. was followed by a new country in MY REPORTERS seem to have the shape of the Five Bells Group done me proud this month with an operating from Iceland on 4/5 50MHZ HF REVIEW enormous amount of detail about August (IP03). His 40th country what has been on the various on 144MHz. However, the real FINALLY IN THE VHF spectrum, AS I SAID in my opening bands. I hope that even more excitement came around lunch time for David Whitaker to update remarks. the HF bands had been listeners will write and let me time on the 12th when, suddenly, us on this band. He caught a few good, too. There was, of course, know what they have been many signals were audible via good openings on 11, 14, 15, 17, a brief spell when the Aurora, hearing on the bands, because Meteor Scatter from Scandinavia, 20, 23, 25, 28 and 31 July and 1. already mentioned, wiped the that is what this column is all a direction where many squares 2, 4, 11 and 12 August. To pul bands out completely. That apart, about. My deadline for the needed to be coloured in!. He some detail on that, he heard my contributors could not December issue is Monday 9 heard SM2CEW (KP15), LAOHY, 9H's, OH's, F, IT9 and ISO in a grumble. There were several October, so please make sure 1 SK3LH (JP93), SM5FRH (J088), rather widespread opening on 17 expeditions to give everyone new have your news in time.

RADIO COMMUNICATION October 1990 65 RAEDEK ELECTRONICS CO. BANNERLEY ROAD. GARRETTS GREEN. BIR MINGHAM 633 OSL Telephone: 021-784 8655 - Fax: 021-789 7128

RF POWER TRANSISTORS ELECTRONIC TUBES/VALVES

MRF134 - 26.00 MRF323 - 26.00 SD1012 - 10.75 2N3055 - 0.75 2SC1729 - 12.50 MRF136 - 27.00 MRF326 - 50.00 SD1013/3 - 10.75 2N3375 - 14.00 2SC1945 - 6.00 A2134 - 10.00 ECF804 - 5.00 MRF137 - 29.00 MRF327 - 60.00 SD1019 - 29.00 2N3553 - 2.75 2SC1946 - 14.00 AZ41 - 2.00 EL34 Siemens - 3.90 MFIF138 - 35.00 MRF401 - 12.50 SD1019/5 - 29.00 2N3632 - 13.90 2SC1947 - 6.00 CV Nos on Request EL34 National - 3.00 MRF208 - 15.00 MRF422 - 39.00 S01089 - 25.00 2N3733 - 14.00 2SC1968 - 26.00 DA42 - 10.00 EL34 GE USA - 8.75 MRF212 - 11.00 MRF428 - 65.00 SD1127 - 3.00 2N3886 - 1.75 2SC1970 - 2.00 E92CC - 2.75 EL519 - 6.50 MRF221 - 9.75 MRF433 - 11.00 SD1133 - 10.00 2N4416 - 1.75 2SC1971 - 3.50 E130L - 12.00 GZ32 - 2.75 MRF222 - 18.00 MRF448 - 69.00 SD1134/1 - 2.90 2N4427 - 1.75 2SC2053 - 1.00 EAC91 - 2.00 GZ34 - 2.75 MRF223 - 11.50 MRF449A - 15.00 SD1135 - 11.50 2N5090 - 13.00 2SC2075 - 3.00 ECC81 - 1.40 KT66 - 12.00 MRF224 - 16.75 MRF450/A - 14.60 SD1136 - 8.90 2N5109 - 2.50 2SC2078 - 1.00 ECC82 - 1.00 6080 - 8.00 MFIF229 - 4.00 MRF454/A -17.50 SD1143 -11.50 2N5589 - 8.75 2SC2166 - 1.50 ECC83 - 0.90 61468 - 9.50 MFIF232 - 13.50 MRF455 - 16.50 SD1219 - 17.75 2N5590 - 9.75 2SC2237 - 7.00 ECC88 - 1.25 6550A GE - 11.75 MRF233 - 14.50 MRF458 - 17.50 SD1224 - 13.00 2N5591 - 10.75 2SC2283 - 10.50 ECC91 - 1.50 7025 GE - 6.00 MRF234 - 18.00 MRF475 - 2.75 SD1272 - 12.50 2N5641 - 8.50 2SC2290 - 25.00 ECC2000 - 5.00 MRF237 - 3.00 MRF476 - 2.75 SD1274 - 13.00 2N5642 - 11.00 2SC2395 - 16.00 MRF238 - 12.90 MRF477 - 17.00 SD1278 - 16.50 2N5643 - 12.75 2SC2495 - 20.00 3CX, 4CX, 5CX and all Elmac M R F239 - 16.00 MRF485 - 6.75 SD1410 - 25.00 2N5913 - 2.75 2SC2630 - 25.00 Tubes. Please call for prices M F240 - 23.00 MRF492 - 25.00 SD1411 - 65.00 2N5915 - 15.00 2SC2905 - 25.00 572B - 59.00 M R F245 - 35.00 MRF497 - 17.50 SD1416 - 26.00 2N5944 - 9.75 M R F247 - 35.00 MRF604 - 2.95 SD1428 - 27.00 2N5945 - 11.80 6 Series Tubes please cell MRF260 - 9.75 MRF607 - 3.00 SD1433 - 13.00 2N5946 - 12.75 MRF262 -15.00 MRF618 - 24.00 SD1434 - 36.00 2N6080 - 8.00 BLW, BLX, 805 - 40.00 M R F264 - 15.50 MRF630 - 5.50 SD1441 - 52.00 2N6081 - 9.75 BLY, PT, 807 - 2.50 MRF313 -11.75 MRF641 - 17.00 SD1444 - 4.50 2N6082 - 10.90 IP, TIP. 811 - 10.00 813 RCA - 20.00 M RF314 - 21.00 MRF644 - 27.00 SD1488 - 19.00 2N6083 - 12.50 CD, B72A - 15.00 MRF315 - 37.00 MRF646 - 29.00 SD1574 - 9.75 2N6084 - 13.75 etc, etc MRF317 - 57.00 MRF648 - 31.00 MRF321 - 16.50 MRF1946 - 21.00

that the transistors anti valves listed in Ihis advert are lust Please add f I 0 °carnage and IS VAT lo all order, PLEASE NOTE a small selection cl Inc many thousands that we have in TERMS OF BUSINESSPrices Correct al time ol going to press ,10Ck PleaSe contact us tor types not listed. Callers h appointment ont lease

PC SOFT W A R E by G4 B M K KITS OR READY BUILT LA high-performance multi-mode program for the IBM PC or clone Requires a T.U. for RTTY/A MTOR/C W and interface for FAX/SSTV etc. TRANSVERTERS Boxed kit Boxed built AMTOR y RTTY Tx/Rx £40. CW Tx/Ax £20. SSTV Rs £10 extra £15 28/50MHz 500m W out, TRC6-10 £64.00 £99.00 alone. Weather FAX receive module £20. Audio Analyser/Tuning Aid 28/70MHz 500m W out, TRC4-10 £64.00 £99.00 £10. Program complete £95. FAX/SSTV/Tuning Aid interface £9.50 28/144MHz 500m W out, TRC2-10 £64.00 £99.00 built. State callsign. disk size (3.5" £1 extra) and selection of modes. 28/144MHz 500m W out rep shift TRC2-10r £70.00 £105.00 Post & Packing £1 Europe. £3 elsewhere. Send SAE for full details. 14,1/50MHz 500m W out, TRC6-2i £72.00 £114.00 Grosvenor Software 144/70MHz 500m W out. TRC4-2i £114.00 2 Beacon Close, SEAFOR D, E Sussex BN25 2JZ. Tel: 0323-893378 LINEAR AMPLIFIERS 50MHz 500m W in 25W out switched. TA6S2 £58.50 £72.75 70M Hz 500m W in 25W out switched, TA4S2 £58.50 £72.75 144MHz 500m W in 25W out switched, TA2S2 £58.50 £72.75 50MHz 25W switched for FT690. TA6S1 £42.50 £55.00 .m. VISA 144MHz 25W switched for FT290, TA2S1 £42.50 £55.00 M N = PROC O M M (UK) SPEECH PROCESSOR Cash paid for used Amateur Equipment. Part exchange welcome. Popular new product SP444E £20.00 £35.00 SAE for stock list

RECEIVE PREAMPS 9.1m-9pm. Mon-Sat. 0235 532653. 0860 593052. 28MHz 20dB gain, 100W handling RP1OS £25.00 £35.50 Callers by appointment please: 102 Larkhill Rd, Abingdon, Oxon. 50MHz 20dB gain, 100W handling RP6S £25.00 £35.50 70MHz 20dB gain, 100W handling RP4S £25.00 £35.50 144MHz 20dB gain. 100W handling RP2S £25.00 £35.50 CASH CASH CASH CASH 50MHz as above, masthead RP6SM £41.00 £53.00 144MHz as above. masthead RP2SM £41.00 £53.00

RECEIVE CONVERTERS 28/50MHz, low noise, 26dB gain. RC6-10 £29.25 £41.00 ANTENNES TONNA (F9FT) 28/70MHz, low noise, 26dB gain, RC4-10 £29.25 £41.00 28/144MHz. low noise, 26dB gain, RC2-10 £29.25 £41.00 THE VHF/UHF ANTENNA SPECIALIST

144/50MHz, low noise, 15dB gain, RC6-2 £29.25 £41.00 5016Hz 144,43511/10 POWER SPLIITERS 5 & men! 144/70MHz, low noise, 15dB gain, RC4-2 £29.25 £41.00 9619 otement O. 3, £61 0714) 2 na, 14411.014 £46 36(b) i4411144 12S0141142 4 way 144MH, 057.53(61 TRANSMIT TONES PCB kit PCB built 4 etement £29.391e1 23 elernen1 £322 0161 7 wai 435M M £45.69141 element crossee £37.26(0 4.23 ele - Maclong fra me - 1750Hz repeater toneburst. AT1750 £4.00 £6.00 4 ray 43644 Kt £536 (c) 9 01e meni fixed 033 12(e) apt.11e. t175.00(e) 2 way 1250).414( C16.35141 Piptone, like APOLLO beep, PT1000S £6.00 £8.00 9 olernen1 portable £35.1914 13961411: 4 way ,2501.4H( 043 36(c) Kaytone, morse dah-di-dah. KT1000 £8.00 £12.00 010Illeelt <1.01351.11 £62.10(e) 23 element (32.29)6) 2 way 129664Hz 038.35(c) Li etymon! £419 06(i) 4,23 ele - eacking Itarne - 4 way 1791511.1Hr f 43 36(4) PLUS MANY OTHER KITS & 10 METRE CONVERSIONS & COMPONENTS 17 ele ment (66.24(0 Power vrviniu C175.00(e) 2 way 230014147 030.35)0) 41514110 55 element £49.27(41 4 way 2300MH4 £43.361,1 9 ele ment 030.43(a) 41[55 ele - starlen9 Ira me - ANDREW NELIAX 19 cle ment Send SAE for Shorllist of other kits, or £1 for Full Catalogue. £36,641.1 11.0.0 1 Splater £250.00)4) LDF4-50A ...... 6.5.10 m 19 elernenl (42.441.1 230061/14 'N' ConewiclOnt C20.00 lc) Kits include pots and healsinks. VAT & P&P inclusive prices. 71 aleraeel 432M11: £4 7.61(0 25 elo menl f43.47(6) TELESCOPIC WO'S - StACYWG 71 ele ment ATV f47 61(a) FRARES - COAX1AL CABLE Shop times: 91 2-5 Tue -Fri, 9-1 2-4 Sat. Closed Sun & Mon. ROTATORS ETC All prices include VAT Please add carriage (a) MOO (b) £2 20 (c) f1.20 UK. MAINLAND ONLY ACCESS or VISA cardholders telephone your order for immediate dispatch Callers 8SPECTRUM COMMUNICATIONS welco me, but by telephone appointment only. please Seed 50p far our catalogue which COntatnç the full specd.cat,onu MANUFACTURERS OF RADIO EQUIPMENT AND KITS UNIT B6, MARAB OUT INDUSTRIAL ESTATE, RANDAM ELECTRONICS (R) SOLE U.K. DISTRIBUTOR el-I VISA D ORCHESTER. DORSET. TEL: 0305 262250 FREEPOST, ABINGDON, OXON, OX14 1BR. Tel: (0235) 523080 (24Hrs)

66 RADIO COMMUNICATION October 1990 BREDHURST ELECTRONICS LTD, 8redhUr.ts High St, Handcross, W. Sx. RH17 6BW electronics e (0444) 400786 SITUATED AT SOUTHERN END OF M23 - EASY ACCESS TO M25 AND SOUTH LONDON

HF TRANSCEIVERS DUAL BAND TRANSCEIVERS ANTENNA RANGE

TS950S £3195.00 Ti-1251- £2313.00 TM 721E £699.00 J Beam 111inimaa' - Tubander £376.35 TS940s £1995.00 TH205E £199.00 TS 790E £1495.00 J Beam 1B3 MK3 - Trrbander £365.70 TS440, £1138.00 TH215E £228.00 FT47OR FNB10 £383.00 Butternet HF6VX £182.85 TS140s £862.00 £1199.00 TR751E £599.00 F1736R Butternut HF2V £163.30 TS680s £965.00 FI 4700RH £499.00 Cushcrah A3 T',bander £329.00 TM231E £209.00 FT757GX2 cwineee IC 32E £399.00 Cushman 2M 215WB £99.00 FT411 • FNB10 £259.00 FT767GX £1599.00 IC 3210E £499.00 Tonna 20505 5 ele 50mhz £50.72 F129OR II £429.00 FT747GX £659.00 IC 2400E £635.00 Tonne 20809 9 Me 144mhz £33.12 IC765 £2499.00 FT2iiRH £309.00 032500E £675.00 G Whip tnbander. 10.15 & 2061 £44.30 IC751A £1500.00 F1212Rii £349.00 IC735 E979.00 iC2GE £265.00 PALOMAR ANTENNA PRODUCTS 1C725 £759.00 1C228F1 £385.00 RECEIVERS 1C726 [949.00 IC275E Inc PSU £1069.00 Antenna Noise Bridge - up Io 103 mtlz 0.59 95 £425.00 ICTSE £275.00 11F225 'Tuner - Tune ypur ATO wilneut transmitting £99.95 EISS.00 ICTSET £295.99 1CF121 LEO S WR Meter - AutoS W R up to 2kiipap £124.95 062000 ($95.00 1 I-126E £249.00 9.1 Bohm for the T2FD Antenna C23.95 ANTENNA TUNER UNITS VCIO VHF Converter Ll 81.00 FRG8800 £849.00 FRT 7700 £.59.00 Filveac0 VHF Converter £100 00 CO-AXIAL SWITCHES FC 757AT £349.00 065050 C1175.00 AT 230 E208.00 SAA50 2 way 50239 E19.49 1 50 AT 250 £366.00 70cms TRANSCEIVERS SA450N 2 way N £26.99 1.50 IC AT 100 E379.00 Onto 3 way S0239 £20.18 1 50 FAFJ 9410 £116.00 TM 431E £3161.00 Oran 3 way N £26.11 1 50 liAFJ 949C £165.60 TH 405E £245.00 IC Rh:A° £489.00 C54 4 way BNC. E20.39 1 50 TH 415E £268.00 FRG 96COM £509.00 MFJ-1701 6 wa S0239 £8.35 1 SO FT 7901111 £499.00 RZ 1 £465.00 Ait 20,02 £487.00 FT 71114,1 £349.00 moRsi KEYS R 535 Airt,ino £249.00 FT 712811 £375.00 ICOO IC-A 1i,10 £499.00 Bncomm Salue i1 18W Kent Morse key kite £33.50 250 IC 40E £299,00 £15.26 1.50 An 1000 £249.00 Brecomm Balun 4:1 111W (16.25 1.50 Kent Twin•paddle kits £42.50 250 ICI SE £310.00 Ho Mound MK704 f20.00 200 Bricomm 71 MHz Epoxy Traps lkW (pair) E13.65 1.50 IC 448E £429.00 Hi Mound F10706 £22.00 200 Soil Amalgamating Tape 10M x 25M M £4.25 0.75 Bencner 811 Black ham 087.42 2 50 7-pleco polyprop Dipole centre £ M 025 Benc her BYT Chrome base £78.97 750 Small ceramic egg insulators E0.65 0 20 Large ceramIc egg insulators £0.85 0 TO • -- POWER SUPPLIES FILTERS CABLES ETC

BNOS 12/5E £74.75 500 AK° élPF1 £7.65 1 CO URM 67 low lom coax SO ohm per metre £0.95 025 OBNOS 12120E L171255 00 AKE) Brad Bremer £7.65 1 00 ICON IC R100 UR 76 50 ohm coax die Smm per metre 00.35 010 ORAE 6 amp t84.98 3 00 AKO Nolen Filter MIS 1.00 * Mobile scanner RX *Full coverage UR 7070 cmin coax per metre £0.15 0.10 DRAE 12 arnp £113.10 5 00 A1(0 High Pass Filter 011.25 100 500KHz-1.8GHz * 100 memories * UR 95 50 own coax die 23rnm per metre 00.40 0.10 DRAE 24 amp £183.42 500 LF30A Low pass litter 02.26 200 ernm Polyester Guy Rope (400kg) per meter (0.25 0.10 AM. FM and W band FM - £499 50mtre 16 swg hard drawn copper rum £10.95 2.00 75 ohm Twin Feeder Eight Duly per moire £0.25 0.10 GO ODS NOR MALLY DESPATCHED WITHIN M RS PRICES CORRECT AT TIME OF GOING TO PRESS - E&OE MAIL ORDER & RETAIL BR EDHURST ELECTRONICS LTD, HIGH ST, HANDCROSS, W. SUSSEX RH17 6BW (0444) 400786 Open Mon -Fri 9am -5pm except Wed 9am-12.30pm. Sat 10am-4p m

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Reception modes: AM. FM (narrow), and FM (wide) which gives access for the first time to FM broadcast and TV sound in a handheld scanner Frequency steps: User program mable from 5 to 995kHz. in any multiple of 5kHz 7 1 f or 12.5kHz MASTERS Comp/ele with set of 600mA/H NiCd batteries, 240V The Antenna Specialists mains charger, DC power cord with cigar lighter plug, soft carrying case, belt clip, carrying strap, From a simple ground plane to a 48 element earpiece, high performance 04900 ?feeble gain multubearn, we can supply the lot! Tribanders, antenna duobanders, beams for 6m, 4m, 2m and 70cm. 23 cm and mobiles Plus G5RVs. rotators, coax, masts ONLY £249 + p&p £4 and acregsories. RSG8 books. Mail order available. THIS UNIT IS £50 CHEAPER THAN Callers welcome at Northampton's sole Jaybeam ITS NEAREST COMPETITOR!! agents. We are authorised Dealers for Kenwood, lcom, Yaesu rind Standard equipment. For Information and prices please send SAE. 1,711 All our new equipment Is covered by a 12 months parts and Labour warranty and For advice call John G7HZB or Dave G1R VX backed up by our comprehensive workshop facilities. We also offer full service on 0604 37769 facilities for most makes of PMR equip ment. Please ring for details. OPENING HOURS:- M O NDAY-FRIDAY 9.30-5.30pm. SATURDAY 9.30-4.30pm. 52 St Andrews Street, Northampton NSA (next to North Bucks Home & Garden Centre) Rs-Gs ..'«sm. Mr7U

RADIO COMMUNICATION October 1990 67 -- In the August/ 13yGONES i September issue of .._ _. D A D 10) %-r,-- , - vece 1 3 Y G O S \ et- lES -•, ill .,_ ...... ,.. the vintage radio We're looking forward magazine to meeting readers at • 'Wireless Novelties' - photo-feature • • The E52 'KPIn' Communications Receiver • the Leicester Show. • International Polar Year 1932/33 • • 'Time-warped Transmitter' - a BBC monster recalled • See you there! • Yesterday's Circuits - AM Detectors • Annual subscription (6 issues) G C Arnold Partners, £13.50 inc. p. and p. to UK 8A Corte View Road, addresses, £14.50 overseas. Corte Mullen, Wlmborne, * LOOK OUT FOR THE Airmail rates on request. Dorset BH21 3LZ, England. Limited stocks cl the previous Issues. Telephone: 0202 658474 NOVEMBER ISSUE... Nos. 1- 6. are slit available at £2.50 each, inc. p. and p. (£2.80 overseas). eib6 e ll : VISA Published 11 October less 10% for orders for 3 or more copies

* Full Results of PIN ORP Contest * Money Saving Discount Vouchers VALVES VALVES VALVES * Radio Personality The following valves in matched pairs 6JS6/C, SKIM. 6JB6/A. 6L06. 6HF5, 6146A. 6146B YES the 6JS6/C is Japanese and works in the FT101. Most amateur radio. * Reviews valves including difficult to obtain types EX STOCK. Quotations without obligation If we don't stock your type we may be able to import for you, PLEASE ENQUIRE, * AEA Isoloop Antenna and Dewsbury REMEMBER over 200 types EX STOCK. Sae for list. 'Phone for assistance re typos Supa-Tuta Morse Trainer suitable for your equipment. USA and Jap manufacture of popular types available DON'T DELAY 'PHONE TODAY 0457 836114, G4AZM * Prize puzzle competition Wilson, Peel Cottage, Lees Road, Mossley, Lancs OL5 OPG Have a go - Find the Morse symbol message hidden throughoutthe magazine and you could win a Dewsbury Supa-Tuta. EARLY WIRELESS WANTED

PW is the best value-for-money, radio TOP CASH FOR OLD RADIO EQUIPMENT, CRYSTAL SETS. HORN SPEAKERS. com munications magazine for the radio EARLY VALVES. CLANDESTINE RADIOS, EARLY DOMESTIC RECEIVERS, ANY CONDITION. enthusiast of the present and future. JIM TAYLOR G4ERU ORDER YOUR COPY NOW! 5 Luther Road, Winton, Bournemouth. Tel: 0202-510400.

PM/ Publishing Ltd. Ene fco House, The Duey, POOLE, Dorset RH15 1PP DON'T FORGET! Tel: (0202) 678558 Fax: (0202) 666244 HORNSE A RALLY Sunday, 14th October — Floral Hall, Hornsea Trade and club stands, excellent car parking, catering, etc. ALSO FRO M PW PUBLISHING Talk-in on S22-G4EKT LOOK OUT FOR Contact Jeff — 0964 533331 — 24 hours SHORT WAVE MAGAZINE

REGULAR FEATURES FOR AIRBAND, SCANNING AND BROADCAST ENTHUSIASTS A M S4- IJa? and ¡Ca £1.60 AT YOUR NEWSAGENT MONTHLY R A DIO R ALLY Saturday 10 November 1990 10.00am - 5.00pm AND DON'T FORGET TO DIAL Bingley Hall, Stafford Show Ground, Stafford

Í * COMPUTERS * 7- * FREE PARKING * WIRELESS-LINE * RADIO * MEDIA * * BAR * ON 0898 654632 * TV * VIDEO * BOOKS *I\...« * RESTAURANT * * PERIPHERALS * * COMPONENTS * * ORGANISED By * Sharward Services FOR THE LATEST NEWS OF PROPAGATION, DX, * BRING & BUY * fel 0473 602460 SATELLITES, SPECIAL EVENTS, RALLIES, ETC. ,....and much much morel Fax 0473 602410

BULLETINS UPDATED EVERY FRIDAY. Follow the RAC Signposts (from J14 on the M61 or use the C ans cost 2 Spfrnin cheap rate, 3 Etplmen all other times. FREE Bus Shuttle Service from Stafford Rail & Bus Stations( )

68 RADIO COMMUNICATION October 1990 Quality MORSE KEYS WOOD from R.A. KENT ENGINEERS See voli DOUGLAS? LEICEs TER The LEADING British manufacturer of top quality Morse Keys - renowned throughout the world for Oct 26 27 their outstanding performance and reliability. YES - WOOD & DOUGLAS SOLID BRASS MORSE KEY We're still around and going stronger than ever! The Kent hand key is used world wide by professional and Despite the fact that It is nearly 24 months since amateur operators alike The we last advertised, we still receive a regular flow of silver contacts are mounted in precision fine pitch threaded orders for our wide range of amateur radio kits. screws fitted with positive locking nuts whiCh are instrument knurled for ease of WHY HIDE OUR LIGHT precise adjustment Our shielded ball race bearing pivots are renowned for their supenonty over all keys using plain UNDER A BUSHEL and bush type beatings The key is available in kit form or ready assembled The kit takes less than an hour to complete. Because the many amateurs in professional radio resulting m a key of unrivalled professional standard communication activities spotted the fact that we £41.00 (assembled) £33,50 on kit 1 orm) Plus f 3.00 post ano pack ino were a source of high quality well engineered radio products that could make their busy engineering lives that much simpler. The result is TWIN PADDLE MORSE KEY a £1M turnover company providing professional Our twin paddle morse key has been designed equipment in the OEM. broadcast and security and precision engineered to the highest standard. industries and employment for 20 enthusiastic Shielded ball race bearings together with line pitch screw threads and instrument knurled heads people. allow precise and individual adjustment 01 contacts and springs Available ready to use or as a kit taking about SO WHY ADVERTISE NOW? hour to assemble £51.50 (assembled) £42.50 lin kit form) To update our faithful followers that we have Plus £3 00 post and packing moved. Not just to any factory, but to a unique, purpose designed headquarters that will give us 10,200 square feet of production space.

SINGLE PADDLE MORSE KEY Because most Operators pretor to select their own contact gap and spring settings d is not WHERE IS IT? possible to have a satisfactory optimum setting for all. With this in mind, we have designed a From the address it looks a long way from Youngs single paddle key with fully adjustable silver contacts and spring tensions. Ball race bearing Industrial Estate but in fact it is just over the pivots Ingeth et with the bonn spring county boundary, less than a mile and a half arrangement ensure a positive return of the key arm to the centre distance. The phone numbers should also be positron. Machined parts are from noted as these have recently changed. solid brass and mounted arta steel base 1 Or Stability £41.00 (assembled) FREE CATALOGUE? £3.50 (in kit form) Plus f 3 00 post and Oacion9 If you would like to know more about W & D. our products, either amateur or professional, then send KEYS OF UNBEATABLE QUALITY AT UNBEATABLE PRICES! a large stamped addressed envelope for a catalogue. Our PC3SC write, phone or tax tor further details to: many years of experience in RS.GB NSA amateur radio, telemetry modules, video links and radio talkback (KENT) R. A. KE NT (EN GIN EE R S) make us a prime source to satisfy 243 Carr Lane. tarieton. Preston. Lancs PO4 6Y8 your needs. Telephone Heskelh Bank (0772) 814998 Fax (0772) 815437 Wood & Douglas, Lattice House Baughurst, Basingstoke Hampshire RG26 5LL Telephone: (0734) 811444 Fax: (0734) 811567 King William Street, , Amblecote, Stourbridge, West Midlands DY8 4EY. Tel: Stourbridge (0384) 390944 GOMMUN1CATIONS SEE US AT LEICESTER WE STOCK STEEL AND ALLY MAST AT COMPETITIVE PRICES — 4x5ft 125" (Ste) £ 700 — (Ali) £12.00. 1.50" (Ste) £ 900 (Ali) £15.00 2.00" (Sto) £12.00 — (Ai) £24 00 LI& PLUS LASHING BRACKETS T/Ks Etc We manufacture ¿Ls. crossed yago HB9CVs. Chscones, Halos. G5RV. trap dipole kits. double diamonds The list goes on and on, so why not send for a FREE catalogue and see for yourself. TRADE ENQUIRIES WELCOME WE WILL BE AT YOUR LOCAL RALLY — YOU WILL NOT BUY CHEAPER

1%. NSA WOOD Et DOUGLAS 0121:11111 VHF/UHF COM MUNICATIONS PRODUCTS

RADIO COMMUNICATION October 1990 69 Members' Ads

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

• BA ROG RAPH by FCC England. Pace now £495. insta telereader CWR-685A: £3. GM4HKW OTHR. Boxed, manual. Bargain: £180ono. Pat. (Black. As new with charts: £355. G3VXZ OTHR. (Maiden- (Kirriemuirt 0575 73455. pool) 0253 45460 after 2pm. head) 0628 27350. • DRAKE HF tort 1114, remote VFO. PSU, extras. • FT290: £200. Magnum 2m revr wired FT101: • BEARCAT 200XLT scanner 29-956MHz. Cost spare valves. manual: £285. 2m FM Westminster. £70. TAU Transmatch: £90. Valves 2.C39 6.40s. FOR SALE £229, boxed, mint: £150. Kenwood Trio 2m 25W sell-contained single ch: £38. Pye Europa M200 Quad spreader: £15. Frank GillYP. (Choley) 02572 mobile TR7625, 144-146MHz. Also remote key- boot mount. tow-band AM with control box. No 75876. • 1 COMPLETE HF station for immediate sale. Pad. dig display. Good cond: £110 or swap both for cables: £15. Grolles 16mm film projector, optical • FT29OR 2m multimode, 20W linear. nicads, c/ Buy now and get in before the kuman does! Vaesu FT1018 etc. Chris G8FHN. (Chatham. Kent) 0634 sound. 250W OH lamp, solid state amp, slot load- case, various ants: £240. Jupiter MVT6000 base FT747GX, SMC 25A PSU, SEM Tranzmalch, ATU. 849112. ing, single unit: £95. G4ULR OTHR. (Norwich) mobile scanner 25-550 arxI800.1300MHz AM/FM, Jaybearn TEA dipole. £800 the lot No derisory • BEREAVEMENT causes sale of complete ng 0603 51656. 20x5 morn scan. 10-band search mems. many offers thank you. Will deliver in Northern England to comprising Yaesu F11011277. FR101D. FV101, • DRAKE TR7 plus PS7: £500 for quick sale other features: £290. (St Helens) 0744 59121. wailing cash Arthur, GODKJ (OTHR rncorrec1). Daiwa active filler AF606K, Joymatch, Asary G3FKM OTHR. (Birmingham)) 021-429 4800. • FT29OR mulamode, manual. nicads. cicase, (Kailas) 0422 368021. ME1 1 N ave, HI-mound HK704, Datong morse tu- • DRAKE TR7A fm, HP7 PSI). L75 linear. strap. min. VGC: £210. Datong morse Mor 070: • 10M FM 6W tort. 4,440 FM, 40th. mobile or tor, Capco AMA3 magnetic loop ant. 13.8 PSU: MN2000 ATU. Exc.cond: £1700. 1.101 minibeam: £35 Kenpro KP60 RF speech processor. mains: basestation: £39 Plus car G3TOW OTHR. (Exe- Offers. View Kent or London. Taylor. 06272 853. £75. Dual-trace scope: £75. G4DIC. (Hinckley) £20. Drue VHF wavemeter £18. Hi-mound MK704 ter) 0392 70938. • BROS 100W 2m linear, LPM144-3-100 with 0455 636315. twin paddle: £12. Heavy HO straight key' £5. Maker • 132F1 long wire possible! 0TH, small 3 bed Dreamt,. par meter. New, boxed with data: £150 • DRAKE TR7A, RV75 remote VFO, PST PSU, CB20 swr meter. HF: £6. SMC13-170L swr meter, semi, long gdn. urban setting, fertile soil. rotovator. nd carr. G1VCY OTHR. (Benfleel. Essex) 0268 ales and service manuals. SPC ATU tittle used and VHF: £6. PSU 13.81/04. Also 25W and 80W sol- garage. Seal G3DGT not OTHR. (Portcheste) 753508. in exc.cond: £900. G3ETA (Dorset) 0305 813293 donna irons: Offers. Ray, GOGXJ OTHR. (She 083483 369. • BOURNEMOUTH 0TH for sale. Queens Park. • DSB2 minisynth modules (Creel). Homebrew field) 0742 465713. • 2M lsh PLL synth Icia AR240 with crepe: £80ono. Only yds trom the site of pre-war BBC 6BM, highest DFM, all for 20m, built, tested: £40. I 6ele 2m yogi: • FT470 VHF/UHF dual-band FM Mt err, with GOBOI OTHR. (Clactorvon-Sea) 0255 821554. point in the area. 4 bed del house al some charac- £20. Cons. 0410K OTHA. (Wdney) 0993 704867. FNBIO ball pack and chigr. Exc.cond, orig.padting: • 21.1 standard C5800 all-mode tcyr. boxed. com- ter, built around 1930. Well modernised, really • ESTATE 030M.I. 2 HROs. 1 cnir matching spkr £349ono. G6MFP OTHR. (Dunstable) 0582 609816. plete: £350 plus p.p. No oilers. (Aldershot) 0252 exc.cond throughout. Fitted kitchen diner. 2 PS 50kHz-30MHz. W2AU baluns 1 new, absorp- 25076 alter Crem or wre. lounges, cloakroom, fully tiled bathroom, gas CH, tion wavemeter 700kHz.250MHz FX1 Muse°, • FT48OR 2m multi mode. cradle. boxed. manuals. • 3 bed semi del house. grge, 2 WCs. CH. Full wide dnve, detached garage. nice gdris. plot size absorption wavemeter 3-35MHz. Dowkey coax VGC: £310ono. loom IC22A, FM. 2m, boxed, manuals: £85ono. G1TAE OTHR, Opstinch) 0473 aerial planning permissron. Quite largo outside 120x4Oft. Quiet area In both senses. Near golf relay 6VAC. Cambridge noise bridge. sig.gen CGr shack (Northwich) 0606 45584. course, shops. schools, short drive to sea. OIRO: 1 100kHz-200MHz by Testgear VHF Mr SEN 225101. • 3 new 813.2 new 4CX250E1 bases 8 chimmney: £109.950. G8DJL OTHR. °en 531867 eve. t44- 146 in 28-30 out, BC221 freq.meter • PS, in • F1726R 24(70/sat. VGC: £850. Tono 10250 E9Oono. Swap TA33. G3MGW OTHR (Bright- • CAPCO aerial switching unit model AS305. ong.case. Keys collectors Chinese. Vítxaptex linear: £150. Weld 30A PSU: £150. SP102: £40. lingsea) 0206 302382 Latest 6-position relay switched model Brand new, cased, 2m Bela, 2m 2e10 portable, Square Sete. Mire MD1: £35. BNOS Meat 50-10401 £125. BROS • 4C X.250B 2m Sneer 200W op: £140ono. FTIOIE, cost £64.95. Accept: £37. 0624 22342 eve. meters, parts. masts, pales etc: Headsets SG &VIM linear 4.32-10-50: £100. loam 04E: £145. Silver good clean cond: £250ono. GW4HKX OTHR. • CBM84 with datacassette and MBA-TOR Epsom Type-F, Ericsson, Rayman 4 & 6 pin coils, octal: Century Seagull 6HPA_S. 0/B motor, clutch/renal (Holyhead. Gwynedd) 0407 764316 before 10am RTTY/AMTOFVCW: £75. ST5MC terminal: £35. Offers. G3AIK OTHR. (Martock, Somerset) 0935 start: £150. G1GNS OTHR. (Warrington) 0925 alter 9.30pm. FU £60. Plus post G3GZO OTHR. 825266. 726821. • FT72611. fitted 2m/70cm sat boarda. As new, low • 530S Trio HF TX/AX, portent cond: E550ono. (Bucklasileigh) 0364 43608 • EX-IBA 4x UHF ch TV transmitter (50W per ch) tirs use only, crw SP102: £595. (Leamington Spa) Icom IC45E 70cm FM 10W ore, perlect cond: • COLLECTORS items. 1154 TX, unmodified and PAs tunable. System incomplete but loads of use- £190ono. G4LJZ, (Wells. Somerset) 0749 77250. in dean cond. Audio amp type A1134A in transit ful pans, EHT. PSU. aocs etc. Also complete manual 0926 651772. • F7757G X with RHIN scanning min. Lithe used, • 6146B. £4ea. General chemistry book: £10. LEO case. Class-D wavemeler with ong peones. All in and cir. dregs. Could be converted to amateur use. as new. Orig.packing. Bargain al: £525. GW4FMD. 6WPM 2.50 807: El ea Motorcycle helmet £10. ong.cond. No mods. RF sig.gen TS418Aal cover- £250 the lot. delivered. (Birmaigharn) 021-472 3688 (Fishguane 0348 831641 Valve books: £2e0. Gas burner: £2. (Barking) 081- age 400-10(X)MHz. Calibrated with PSU. Offers • FDK Mule 2000 2m multimode Inn:AC/DC: £150. • Work some real DX Complete 6m station, com- 594 8675. invited. 04AKG OTHR. (Croydon) 081-651 5147 Yaesu FR508. FL5OB TX/FIX HF: £100pc G4ISN prising Yaesu FT690, 5-element Vagi and 15W • 61s4 Mr and amp. 20W oils. 2m IF. Both by 24hrs, 0TH R. (Loughborough) 0509 843589. • COLLINS 65151 gasc on rcvr 30kcs-30MHz, c/ amplifier. All items mint and boxed. antenna never Spectrum Comma: £115. John G6SVJ. (UtIoxeier) • FINAL bargain clearout. Over 200 LP records, no w full set of manuals in GWO: £550. G4AKG OTHR. assembled. Cost over £500 new £350 the lot Cad 0889 565836. rubbish: £150. AOR 1000 scanning rm. hrh 8MH z • (South Croydon) 081-651 5147. Marti n. GI FOF. tel: 081 675 6722 (day) or 081 543 • 70CM Mt TR3600 c.ny 12V adaptor. nines. I.3GHz. Mint: £185. 0467 25365. chrgr: £150. Also TW4100 2m/70cm mobile: £350. • COLLINS 7551 AX: £225. Eddystone 940 with 5357 (evening). • FFIDX400 rcw 160.10m plus 2rnrem matching sere plinth: £150. Racal 1218 dig readout, G.C.R.X. • FT811 Yaesu 70cm Mx, spkr, mid. hard and soit John. (W.Micaands) 0675 466083. FLDX400 transmitter 80-10m. Both with manuals. • 9IN screen green monitor: £20. Haber weather fitters. Mint £395. G4LW OTHR. (Trowbrrege) 0225 cases, 2x ban packs. Wick>: £250. Divers watch: VGC. no split: £140. F1 690R multimode with IOW 753166. £30. Minolta 110 zoom SLR camera: £40. Casio digitiser lor BBC computer: £40. Timestop R X lot amp exc: £270. Sandprper 3ele 6m plus 441e 4m ROO M. sets: £40. Scopes scope, as new: £80. • COMPLETE HF station. T$1308 HF tc-vr. AT130 SK200 sampling keyboard: £150. Casio DBX100, beam: £10. MM2001 Firrelo TV mar, VGC: £45. AR2000 scanner. £195. Trio FM2200 ton: £50. ATU, OFC230 Ireq.controller, PS30 PSU. Butter. Databank, Watch etc: £35. Stephen Hobbs. 07EX.2 BelcomLS102L 10m muttered°. goodcond: £130. nut HF6V ant. Orig.boxes. manuals etc: £700or OTHR. (Gillingham. Dorset) 074785 639. Plus post. Team TRX404 revr, new and boxed. MML21V1OOS 28MHz 100W linear. hardly used: ouch or PC compatible with hard disk and colour • F79010E. mint, FTV901 2m boxed, Daiwa auto llittlehampton) 0903 724805. £75. Spectium TRC4-10 10-4m Mr, works, not monitor. G4F24. (Milton Keynes) 0908 510570. ATU: £550. (Leicester) 0530 24,3469. • 4200 Aye linear amp model 1 25r6ow. Can very won!: £15. SEN own Eliminator MKII, brand • COMPLETE FITT? setup comprising Commo- • FTONE soc and: £900. IC290H. exc.cond: £300. convert 2/4/6m: £10 plus carr. UHF relays N-con- new: £70. FT707 «bodged for top-band, good cond, dore C64. disk drive, AEA CPI terminal unit and s- G3DKO OTHR (Kings Lynn) 0760 23897. nectora £10ea. Various FR.) coax connectors: works well: £300. All 'gems, buyer collects or ar- wore. Also comes with modem, cassette deck, • G4GKU miniboam plus 3rd ele: £75ono. ST5C £4ea plus can. Games, G3AOS OTHFI. (Mac- ranges cart. No offers. cash only. Marlin. (Ca/anal- des! SL11 000) 02605 2287. joysticks and about 100 disks: £225 the lot. Am- CWiATTY ind Bartag insts: £60ono G4%711 OTHR ton) 081-773 2983. • ALINCO 2m 45W FM icy; with selectable scan strad PC modem V21. V23: £55 inn/ aware. Steve, (Scunthorpe) 0724 732226 • FFIG7 raw 500kHz-30MHz. trnmac. unmodilred steps and 1 enern channels. Mint cond - £240. G6XJU not OTHR. (Chandlers Ford) 0703268682. • GEC low-band, GEC high-band and Pyo high. with m anuat £120. G1JFB OTHR. ¡Ithrral) 051-625 G4KOU OTHR. (Wonhing) 0903 62129. • COMPLETE station TS140S, mid, spare DC band PMR torts. All working but no stab etc: 5473 • ALINCO 0.15000 dual-band VHFiUHF hat in lead, wrehop manual. Used only on AX: £665. Offers. G1LSK. (Lincoln) 0522 546145. • FRG7700, no ment with FRT7700. FRV7700 mint cond with nicad pack and Mgr: £200 G4I3XY PS30XM PSU metered volts/amps: £97. FL2100B • GOING OAT. Yaesu FT726R 2m)70crni6m. Sal. model D: £280ovno FT29OR. case, reads, chew, OTRA. 0734 594495. linear, recent re-valve: £425. Yaesu YPI50 dummy Latest SMC mods, just serviced. Hand min, MD1 helical headset, boom mid. MM3OW linear. No • ALTRON A0620 3E 4-band yagi. insts, spare foactrwanmeter £65. Electronic keyer 240rI2V desk mic. YH 55 phones. Kenwood T/s4221ES 45W spins: £3010 Prefer buyer collects. Cash sale only. spokes. GWO: £110. Buyer collects. GOJMM Heathlut HD Imo. £35. TS520 CW filter £25. All FM mobile. Oscar 2NE 7r8 whip. Healherkto mobile 0012V OTHA. 011-111. (tllord, Essex) 081-554 3492. items in as new cond. (Civard, N Wares) 0352 mic. Trio 2300 FM portable 2m. All acts Lowe SAX. • FAG8800 c/a FRV8800 and FR17700. Save • ALU-MAST, 2x1Oft triangular lattice sections. 2 771520. HF rose G5RV Yaesu G400FIC rotator, mast, 0200 on new pnce Only: £600. OTHR tope:etas for 2in pole, hinged base. Buyer collects. • DAIWA 2m HHT and matched 20W linear: £170. Gauxc beams, yens, cables, coass. switches. Swr meters, (Evesham) 0386 831508. Would go on roof rack: £100. Sundry 2rn mast Worn 27E 25W 2m compact mobile: 0200. G1SHV. per meters. Remote spies Clock. 3 PSUs. • Friel E tcvr Ind CW filter and lowpass leer. fittings available: £10. 41140 control box. £15. ITvackenham) 081.894 1892. Magmourds, gutter mount Tape recorder cm tapes. G3UZM OTHR. (Exmouth) 0395 273090. • DATONG active ant 40370 outdoortindoor with Boxed, min, leads and manuals. Hardly used: Morse oscillator and key. ATU, dummy load. Fit- £340ono. FV101V eut VFO to suit 101E11101E. • AMIGA A500 computer, 1084 monitor. Star PSU, control box. staintess steel ant: £40. Yaesu ters. Spares. Chrgrs. Mres, phones. Big desk lifted LC10 cobur printer, disks and programs. Graphics, PA100 pwr unli FT77S. believe can be used for Exc.cored. boxed and manual: £75. Oregon 32 out for station. I will supply you with enough gear to computer, boxed and lots ol mags arid books on Chess. Protest etc. Bargain: £500. Buyer collects. other Yaesu rigs, new, boxed: £100. Mono monitor set up a VHF/UHF station complete that any G4GFIG OTHR. (Torquay) 0803 327050. 13in tube, 14x13.25s1525in. No bums: 020, Joys. Dragon: £25. Alan G4MOM. (Basildon) 0268 Amateur would be proud to own: £1500 the lot • AMT-3 AMTOReRTTY term inal unit, as new cond tick ant with Joymake 111B ATU: £20. Aerial 590635. 074KJ OTHR. (Newcastle, Starts) 0782 635588. • F11010 with CW tiller, min. spkr, phones, hr with rebook: £139 plus post. G3KZU 0TH R. (Ox- tuning unit typo 126 approx Sin sq by 10in deep, • GREAT lake-oft in the Sun. 2 bed apartment. ford) 0865 63000. Roller coaster aperos 55 turns by 2 3/8in dia. turns book. £300. Mr.mound key HK704: £12. Books: large glassed in terrace. top floor (17th). panoramic • ANTRON 99. Fibreglass Omni-directiona1 ant counter ammeter wartime model case. Needs RSGB Hibook 3rd ad, ARAL fi/hook 28th ad, Redo views of Benidorm. Olympic pool set in beautrlul 18111all. in 3x 6It sections. 9.9d81 gain. Covers 10m repainting by Insides VGC: £30. Starphone Techniques 4th e. Radio Dala 5th ad, Remington gdns. Phone Instated, panty furnished: £50,000. band. VP 2000W. Entire ant radiates. Only 9mths 433megs xtatied 433.375/434.975 repeater and TV I nteference. Amateur World Atlas. The lot: £12. Contact by phone EA5GFV, PO Box 63. Alicante. old: £25. Post extra. Stainless steel whrp ant. 433.775 simplex. Approx 3W out. Lore cl CCT gen All items carr. paid. 031-556 3281. Spain. (Elenidorm) 010-346 586 5599. Length 8117m £10. Buyer collects. Limpet mag- 011-111: £35. (Towcester) 0327 52309. • Filet ZD. new cond, fardmic. new bands: £425 • HALLICRAFTEAS rcna 538E mains voltage netic mount 6in dia. Never been used 025 Post • DIALATRON phone answering machine, model • can. Scarab RTTY MPTU v dace tapes. inst £50 240V. GWO: £25. Cheney, 7 Foxfield. Everlon, paid. RadComs from Jan 1986 to Dec 1989: £25 lot. 500. 5rnths old. Mint cond. Cost £67.50. Now have • post. GMOHVE OTHR. (Glasgow) 041-440 0223. Lymington. Hants. (Lymingtorrt 645231. To be collected. Assonment of transformers: combined unit: £35. Calculator world time, alarm, • FT102 HF tort AM/FM 200W late model: £495 • HEATHERLfTE Explorer HF linear amp. Eirnac El Sono lot (Ormskir(i) 0704 892088. each male, 200Y calendar old: £5.50. Casio U5385 Dentron linear GLA1000B 500W: £200. Barry. 2x3-500 valves: £750. Ya041.1 FT102 SS£3 6-pole • 482001 25.550 scanning AX: £190. Yaesu calculator 200Y calendar, alarm etc: £4.5e. Casio G4BHE OTHR. (Basingstoke) 0256 782560. eat filter, new in box: £20. Alan. G4YY0 OTHFI. F170911 70cm M I: £150. Tasco 16x50 binoculars: ML88ernslar above. £4.50.1ntl Mendel good cond: • FT 102, at liftera. SP102, morse key. 2m whip. 5- (Bury. Lancs) 061-797 7893. £20. Paddies LLC SLR cernera: £50. G3UYK. £10. All with rests. Now Tandy rechrgble bets. 4 band diamond vert, lkW pwrrewr meter: £700ono. • HEATHKIT 10.18u scope: £40. Lionel Corp J36 (Winchester) 0962 67819. HP20 cells: £5. 6 H PI IC cells: £7 Still in wraps.. GCULI OTHR. (Bristol) 0272 892627. bug: £35. Carrestra. G3AUZ OTHR. 0909 473893. • ATU Versa-Tuner now surplus to requirements G3IJL OTHR. 081-749 1454. • F1102. FC102 ATU, MD1 Mc, HF Homobrow • HEAVY duty telescopic tower by Hygain USA. due to purchase of matching ATU. Not used by this • DIAMOND wideband scanning ant DI 30N 26. linear 400W. Complete station: £800. Buyer col- 1311 stub mast thrust bearing, top section same station due to not having passed morse test yet. 1300MHz 5011 low loss coax. As new: £40ore. lects. G4YIJ OTHR. 021-747 3303. size and bottom section P60 not a toy: £450ono. Exc.cond. Boxed, etc: £95ono. Buyer collects. (Bedford) 0234 711904. • FT102. VGC. FM fitted: £500. Pavan PK232 Also 14MHz 3e1e yagi by Wilson USA: £100ono. Cohn, G1GPD OTHR, ¡Sudbury, Suffolk) 0787 • DOES anyone want large quantity received OSL with Pacmak MBX, exc.cond: £225. F1290 env G4XEK OTHR. (Stoke-on.Ttent) 0538 754553. 77004. cards tree? G3CGO 0TH R. (Luton) 0582 25519. nreads, case. etc. As new cond: £225. FC902 ATU: • HENRY Rae() 20024 144MHz linear amp. New • AUTO ant tuner. loam AT150. Eac.cond: • OP-CP5 5-band HF vert ant, with radial Wt. Mint £125. 144MHz MN 30W linear: £80. Welt/ SP220 model using 3CX800 valve. As new, only a few hre £135ono. SA/band HF vert ant plus radials: £45ono. cond, boxed. unuse-d: £90. Buyer collects. Stuart svelpwr meter: £50. Star Masterkey: £40. (South use. Rated at 1200W ore. Any trial. Offers around: GOGZJ OTHR. (Basingstoke) 0256 22591. GOLOE OTHR. (Dukinfiekl) 061-330 8149 Wirral) 051-339 9599. £1050. Buyer must collect G6NWF not OTHR. • AVO valve tester Mk2 with manual. Oilers over: • DRAE SSTV tcyr: £150. TS180S service man- • FT209R Mi. mint cond. keypad entry signal (Birmingham) 021-471 3243. £10 please. G3PCA OTHR. (Ilford, Essex). ual: f 6. TR2400 service manual: £3. Operating meter care all usual aces. Plus PA3 Vox headset • HELIAX connectors type 45AN (female N) and

70 RADIO COMMUNICATION October 1990 MEMBERS ADS

type 45AW (male N) tor FJH 5- 50A cable: £15 Type PSU's 13.8V/30A: £65. 13.8V/5A: £19. 70cm pier Bin Mr 28MHz input: £120. MN 70MHz 100W • TEN-TEC Argonaut 515, audio filter, AC PSU: 44AW (male N) lor FJH4-50 cable: £10. 3f1 lengths splitters: £25. 2V SAN Wad acid rechargeable baits, linear with meanie: £95. Sectional mast. approx £325. Ten-Tee ATUNivr: £50. Kenwood of FST4-50B cable with 44ASW (male N) comer- 6 for: £9. Drams 256KX1 15ONS, 8 for: £6.50. 4511, in carry boxes: £75. Mesh dish 6th dia: £45. T599S. R599S. 005 dig readout. 2m/4m ores, tors each end: £20. Leeds and Northrupp model 04011F not OTHR. (Aylesbury) 0298 714888. 23cm epoleeisk feed for dish. £45. 432MHz 21ele 500Hz filter, matching le. Super HF twins: £375. 4232 Wheatstone bridge: Offers. All y can. • KENWOOD 9000 car, little used. PS20 PSU, 71 tonna, VGC: £26. 70MHz 6ele beam, well used: £9. 4CX25013 valves (ITT), new. boxed 25es. Navy GM32MA OTHR. (Peterhead) 0771 24301. 8 whip aerial. New hand me. Adonis head band V- Star NL I 0 printer with 3 spare ribbons: £95 Dressler fflOfSe key, large: £30. Racal 5MHz xtal ovens: • HF 225 with FM and keypad: £375. Spectrum a3 type: £305ono. Complete course of morse records ARA30 active ant, as new: £95. John, G4BVE £5ea. Racal RA218 160 adaptor: £30. RAI 37A and J&P Quark: £140. Kenwood 1406: £625. GLICKI 18.2 with HMV portable record player: £20. Buyer OTHR. (Cheshire) 0606 48880. VLF adaptor: £40. Racal 32MHz counter: £35. OTHR. (Evesham) 0386 881155. collects. G2043A. (Hungarton. Leicester) 053750 • PLESSEY 155G solid slate 30-band. V.powertui G3M8N OTHR. (Bath) 0225 810621. • HF linear 2e 813 separate Eifr PSU milspec 310. rcvr. built like tank: £275. (Southall, Middy) 081- • TEN-TEC Argosy II kw with matching PSU: components, matching cabinets, tested, unused. • KENWOOD 161208. VF0120: £400. Yaesu 571 5759. £495. loom 245E 2m multimode: £200. loom 24G trapped vet 10-15-20-30. Sm 1.2:1 throughout: ATU FC102: £150. Kenwood filter YK88CN: £25. • PRO2021 prop scanner 200th. Almost new, 68- 2m FM: £100. Trio R2000 gen.cov R X: £375. Yaesu Offers. COCCI OTHR. (Kirkby-in-Furness) 0229 04YRR OTHR. (Stoke-on-Trent) 0782 395017. 512MHz: £150ono. (Warrington) 0925 73600. FTVIO7F1 Mr 2m and 70cm: £250. Dig readout 89635. • KENWOOD 1S430S and PS430 PSU. incl AM • RYE MX296 432MHz acre FM mobile with module for FRG7: £25. GOMHO OTH11. (Canes) • HF5B Butternut 5-band compact butterfly beam. and narrow SSB filters: £720ono. 6011 trailer- CTCSS and Selcal. As new: £85. Uher tape re- 0733 230088. weight 19Ibs: £135. G4MET OTHR. (Hereford) mounted heavy duty tower. similar Versatower. corder 440e. report stereo IC multispeed 4h evii • TEST equip. Thandar portable 1 OMHz scope incl 0432 355297. Takes large HFNHF beams. Ideal field days. con- aces. Hardly used: £160. 1GHz RF voltmeter. probe, chrgr and case. Little used: £165. Fluke 75 • HI-POWER 144MHz hear amp using a pair of test groups. May help circumvent planning prob- v.sensitive marconi TF2604, as new: £40. (North- multi-meter with rubber case and leads: £70. Phil- 4CX25061 valves, fully metered c.nv PSU. Offers lems? With head unit, cables, trailer lights, brand ampton) 0604 862803. ips PM5503 PAL TV pattern gen. RF/composite. around: £280. Yaesu FT29011, slightly scratched cl new tyres (worth £100). Genuine reason loi' sale: • ORT sale at 2m equip incl $0W ampereamp: Xhatch, bars, greyscale etc: £60. GLUKP not OTHR. w chrgr, ecase and 70W linear: £210. Tonna tele- emigrating: £700ono. Steve. G4JVG OTHFL £45. Leson desk mic: £25. Rotator. brkts and ap- (Shepperton) 0932 788174. scopic galvanised mast with taxed and unused (Reading) 0734 722538 eve-w/e. pros 6011 UR67 cable: £42. 9ele tonne ant: £16. • TEST gear clearance. Level TG150 AF eg.gen rotator. Only: £100. Racal RA17 gen.00v HF rcw. • KENWOOD 164305 with YK88A AM filler. Sete yagi ant: £12. Colinear ant: £18. All items in sin/sq: £20. Tech TM3A AC mVmeter: £15. Lyons exc.cond: £80ore. (Wolverhampton) 0902 771909. YK88C CW fitter, YK88SN SSS filler, FM430 FM WO. Will accept: £135 for the lot or reasonable pulse gem MP51: £25. Tech TE2OD RF sigmen: • HL2K hi-pwr amp: £950ono. R2000 . VHF: unit. PS430 PSI.): £700. GW8GPX OTHR. (Mon- offers considered. Steve, G1OXY OTHR. (Abing- £20. Gould timer counter 10311 DC-10MHz 6- £500. SEM noise bridge: £25. HFLPF filter: £10. mouth) 0600 2498. don) 0235 531169. digit: £25. Feedback TWG504 function gen sirvsq/ Dual-band vert: £20. FT23, me. spare bet: £190. • KENWOOD 164408 auto ATU built-In. Also • OSY to 6m tor some real DX! Complete station. triangle. exit sweep: £35. Amtron AF wattmeter 1.5/ 112 size G5RV trap kit: £15. PCCGA card: £15. MC60A desktop mic. PS430, SP430. built-in SSB all in mini boxed cond. comprising Yaesu FT690 15W ranges: £10. Sabi:ones 3.5LE0 bench nil- Mike, G3PGA not OTHR. (Fremegton, N.Devon) narrow fitter. All boxed as new. Not yet 6mths old. Mel, 15W knee, 5ele tonne. Cost over £500 in timele with data hold probe: £12. Aim 01537 0271 24285. Transport forces sale. Cost £1620 with receipt. Feb: £350 the lot or would consider swap for wind- transistor/diode tester, suitcase type: £10. All with • HOUSE move. FTIOIE, CW filter, spare valves, First: £1250. Also 2-section lattice hewer tower. up tilt down mast. Martyn G1F0F. (Wimbledon) manuals, cart.extra. Resistance capacitance sub- desk mic: £300. FT101 Mk2. FM, repeater shifts, 4011. Not yet assembled. Brand new with head 071-735 £611 day 081-543 5357 eve stilubon boxes: £12ea £20 both. Ave valve demo- toneburst. G3LLL DBM. New valves: £295. Both bearing and all bolts: £500. Dave GI LBE. (Walsall) • RADCOA1S 1967, 1969-77, 1980-88. Some ten stic meter Mk4. VGC, full connection data: £15. VGC. KW Vespa Mk2. spare PA Shure me, per- 0922 24329. bound ves: £60ono. Buyer collects or could de- Buyer collects . (Merseyside) 051-426 3704. fect: £85. Swan 350. HF ton. manual, orip.packing, • KENWOOD TS530.S. SSB filter, MC35S, 10m liver. (33YWU OTHR. (Delamee) 0606 888277. • TOWER. winch up lattice, 3-section 12m high, mic. en: £175. Hammarlund H0120 RX 540kHz- ant: £495. Kenwood TR751E a PSU: £475. GOMXH • RADIO and Television Servicing 196748. 68- head une with bearea. lOtt 2in alloy pee. K0400fiC 31MHz, perfect order: £65. Sharp MZ8OK with WP, OTHR. (Been) 0204 852410. 69. 69-70: £5ea or £12 all 3 plus post Sony colour rotor. 3e1e TET33SP inbander, 10m 1/2wave vert. Machine Language, 3e games, manuals, tapes, •KENWOOD TS711E with VSCI: £840. BNOS camera DXC1640P semi-pro, we case, aces, All coax, all cable, buyer collects and will assisted printer: £100, FDK750E 2m multimode. menount LPM 144-25-160: £180. Rotator MR750E. 2 mo- service manual, encenses cable. VGC: £220. in dismantle: £500ono. GOANC. 071-247 6097. scanning mic, manual: £195ono. G4JXK OTHR. tors: £180. Hi-mound brass key. HKB02: £60. All G6A0C OTHR. (Oxford) 0865 243634 after 7pm. • 1112500 as new: £125. TR3500: £120. Mobile (Fareham) 0329 230737. above boxed and ono. (Nottingham) 0509 852085 • RADIO Shack dot matrix printer, as new. Ideal hod, ind chrgr and PSU: £30. S12 base unit: £35. • HP calculators, HP41CX, card reader, games. • KENWOOD 15830S in exc.cond: £650. NEC data modes: £60. RX400 telecopier, 4-speeds. Spare balls etc. G4TZB. (Manchester) 061443 circuit analysis, advanced functions, maths and (Tandy 100) laptop computer, ideal packet: £120. clean cond: £35. 100m 8-core screened as RS367- 6116. stets peas: £160. HPIL Pinkert printer: £90. HP28C: May plexch TS830S for a good rend TS130S or 476: £25. 100m 12-core as RS367-612: £30. Both • 1119000 Trio with Mirage USA 30W amp H/B reg £60. Donald. GM1OIN OTHR. (Edinburgh area) IC730 plus cash. GMIWZ OTHR. (Edinburgh) rated IA RMS/core. Mitsubishi cathode ray tubo pack vert and halo ants. mobile fittings: £350. 0383 414283. 031-331 2755. hfee S11419-LBW2 14in. new: Offers. All items T112600A 144MHz heeld 2x nice, packs. 120VAC • HP41 calculator, card reader xfunctlons quad- • KENWOOD 1S900 Cm PSU Super Rig: £503ono. post extra at cost. GOARF OTHR, (Leominster) chrgr 240/120 transformer, Kenwood: £150. All had mem plus sAva re and manuals. Also Tandy 102 No time wasters please. Trio TS130V HF mobile 05447 350. little use. Owner Imes abroad. GW3JI. (Clwyd) plus disk drive and eware: Offers. 64371 X OTHR. tom £330. Martin G3ZZS. (PlYrilouth) 0752 707550- • ROTATOR CDE heavy duty on base mounting. 07456 89903. 0908 644244. • KLMKT34A 4ele beam, as new: £295. Jaybeam Buyer collects only. G3BDH OTHR. (Iterd) 081- • TRIO 599 HF roe. Fitted 2m and 6m xer mod- • HRO roe caw orig. PSU 6 cods. Some band- 16e1e 2m beam: £25. As OM. G3PJK aPIR. 061- 554 8012. ules. Good cond: £120ono. Alan GI EBH. (Basil- spread: £48. Camped. Also Iraq and voltage slabi- 653 3213. • SE M ORM Eliminator: £40, exc.cond. Sewn:lime don) 0268 545573 after 6pm. lisod supply 240V/50Hz or 110V/60H z in and either • KW2000B matching PS, manual. cir ding, Shure revert amp attractively boxed. Mean PCB. Int • TRIO 111000, VGC plus suitable ATU: £180ono. Iraq or voltage out. Ideal for running US equip. Ex- 201 me. Buyer collects and i needs: f 210. G3UI E. PSU: £25. Hometeew PI network ATU: £10. Mild Buyer collects. G3JJA OTHR. (Crewe) 0270 69708. manne comm unit: £50 camped. (Haverfordwest) (Portsmouth) 0705 377528. 28MHz-I44MHz Mr. virtually unused: £75. All rams • TRIO TH21E 2m portable with chrgr, 2 rubber 0348 881346. • KW2000B PSU. manual plus spare valves: £140. plus post or collect. Mark (Gilingham. Kent) 0634 duck ants, ecase, operators & w/shop manuals: • HT transformers, 1730V CT 180mA 2olt, 1076V Yaesu Y0148 dual impedance desk mic: £25. 30822. £100 a Carr. OTHR. (Barry) 0446 781261. CT 525mA, 600V CT 600mA, 1400V CT 175mA Wood & Douglas 2m 30W linear and preamp. built • SHACK clearance. Lai:pear LG50.Heathlut RAl. • TRIO TR2400 reek! 2m toe ew nicads. chrgr, 2otf. all 240V tapped Lip, commercial printed rat- from kit, suit FT290 or similar: £25. GOL WC not Maplin RF sig.gen. Make me an offer. Buyer col- and orig.packing. One owner since new. Immac: ings, all: CI Oea. Buyer must collect G2HBO, (Fie OTHR. (Grimsby) 0472 352842 after 6pm or we. lects. oaezi OTHR, (Chester) 0244 351357. £80. Ted, G8OGV OTHR. (Peterborough) 0733 Bowed', Pulborough) 079882 626. • LCL CB tow converted 10m FM. Cirkit squelch • SHACK clearance. RACAL RA17L: £175. Mar- 370748 day 0733 66471 after 6pm. • ICOM 251E. Meek, good cond: £400. BNOS board. AMSAT preamp onv manual, me. boxed. coni TF144H sig.gerr £80. 1'F1048 VVM: £50. • TRIOTS120V Ion: £280. Kenwood AT130 ATU: DFM 250MHz: £45. 11/8160m TX: £35 KB 80/20 LPM-10-100 £100. May split or £475 the VGC: £40. Faulty 70W amp: Free. G3WPO Aden- £80. Yaesu FP130A PSU: £30. Kerrivood MC50 me: tcvr: £50. 2m Cambridge: £30. 10.7MHz multimode pair. Terry, GOMND OTHR. (Biggeswade) 0767 nalab dig RF wattmeter. Redfern Aug 83. Peak/ £30. Buyer collects, open to otters. (Cardiff) 0222 316431. RMS, FWD/REV. VSWil. Construction complete. IF board: £25 Swepwr meter: £20. LCR bridge: 798340 alter 6pm but not between 29 Sept and 7 £15. Xtal calibrator: £20. Solartron scope, faulty: • ICOM 255E 2m mobile: £140. One 6A PSU: cased, unused, needs wiring. Use ext dig voltmeter Oct. £40. Yaesu FT727R: £325. AST Rampage for AT Indicator: £35. Books "Radio & TV Servicing" hard £10. Pye A2C0 70MHz linears: 220es. ERD parr • TRIO 1S830A CAW CW filter, mic, service man- meter: £10. 25A PSU: £25. 5A dual 0/F' PSU: £10. 2meg EEMS, populated: £500. YaesuMH1B8mic: backs. 7vols 1953-59. Nostalgic, all for: £7. All plus ual, spare vahres. Boxed: £650. G4MYX OTHR. Dozens of components, valves, boxes etc: £20 or: £10. Yaesu 0980 cable: £8. Himound H K702 key: post. G31SDOTHR. (Sittingboume) 0795 477431. (Tadcaster, Yenta) 0937 832061. £600 the tot. G4UF0 OTHR. (Walsall) 092233979. £10. Advance eg.gen: £110. (614 0-70mc). XT 5.25 • LEGALLY CONVERTED 10m multimode ex- • TS440S. ATU440. filters, warranty until 21-11- • SHORT wave revr. Tandy model DX300 10- de black front: £40. Star NLI 0/C64 cable, manual: CB. VGC. £80 GOKS8 (Telford) 0952 243839. 90. Mint, boxed. Prefer view/coned: £900. Save • LETS be sensible. FTIO1B: £150. KW1000 HF 30MHz cont. Dig display. Exc-cond. Good starter £10. Trio AT230: £135 (Evesham) 0386 74494. £382. G2AXO. (Wisbech) 0945 63555 1-2pm 8- amp: £200. Drae secan tom £150. KW monitor- RX: £80. Dave G3201. (Reading) 0734 352777. alter Sept 23rd. 7pm anyday. • ICOM 2800 multimode,131406 12 PSU with bale scope: £50. FT7 HF TIC IOW: £150. Matching PA • SILENT key G3H RO sale. FT757GXII: £900. e TS530S ley: clw alters 1.8kc and 500c/e. Digital beam, mobile whip, rotator: £420. Buyer collects. FL t 10100Wplus:£75. Daiwa auto ant tuner 200W: FP757HD: £175, FL21001inear amp: £450. FC301 VF0230 with mema and cross band wkg facility: G3CSE OTHR. (Wervryn Garden City) 0707 £65. GrICXB OTHR. (Fee) 0753 652933. ATU: £100. IC2E: £100. Atlas 180 HF taw 1.8- £650. G3PTN OTHR. (Leeds) 0532 654644. 328831. • LUXURY upper ground floor flat. Quiet aspect. 14megs: £250. FT101E, VGC: £300. FT23R 2m • TS530S. mint cond, orig.packing. manual: £400. • ICOM 2KL linear with PS: £830ono. Yaesu 20yds from beautiful River Blythe. Butternut HF6V FM: £250. Buyer collects. G4IPF OTHR. (Bromley) FT690Mtil: £180. Strurnech Versalower ow winch, FrONE. all extras: CI 100ono. (Radcliffe) 061-723 ant on roof. debugged and working. 0TH Solihutl, 081-462 3209. ground post. 60h: £275. G6YEK OTHR, (Penryn) 2607 not amp. la/Midlands. GONOB. 021-704 9689. • SINCLAIR portable scope SC110 cre meads. 0326 73480. • ICOM 751A HF lox. mint cone Offers Might pi/ • MATCHING Melds TR2600 (2m), TF13600E chrgr and X10 probe. Offered at under 12 price. • 15830S HF TX/RX, plus AT230 ATU, matched exch. Looking for Kenwood 1S790E or TR851E (70cm) with prof bull base-stand. P/U and 70cm 295. (St.Helens) 0744 51814. per spare finals, integral PSU: £850. G4OCH WHY. Malcolm GOHOG. (Ruislip) 0895 676919. linear 10W Trio spknmic SM30, needs, dirgrs. • SM220 Kenwood station monitor with BS5 pan OTHR (Brownhas) 0543 360372. • ICOM 751A ton. Recent purchase. Never been Very neat, flexible unit. Excoond: £350 for the adaptor, pan graticule, manual, leads. Little used, used. Cost £1500. Accept: £1100. Dr. Adam. complete station. Also Trio 2600/3600E aces 026 mint cond: £285. Will deliver within 50 miles of • TS940S lined ATU. Lowe mod. New and un- used: £1495. (Leamington Spa) 0926 651772. (Douglas. 10M) 0624 22342. DC/DC cve: £10. 1313 dry ban case: £5. MS1 carrectra. GW4ZXG OTHR. (Bndgend) 0656 • ICOM 1032E dual-band Mt Extended RX con. mobile stand. deer and Pot): £20. Accs free if 653585. • UHF Europa. elect R130. toneburst, preamp. with mic: £45. UHF Europa unmodded: £25. PF2. 138-174MHz. 420-460MHz cAv 2x BP3 needs and compete stauon bought. Diablo 630ECS daisy- • SMC connectors, new, free plugs, bulkhead BP4 ball case: £250. Minolta Dynes 3000 camera wheel printer, cede, manual: £125. Rithayser cable jacks: 60p. Panel sockets. PCB jacks: £50p. fitted RBO, 11814. SU8, pearlier: £40. PF2. SUB: £30. Rye 8-way chrgr for PF2s: £20. FT202 chrgr/ body. 2mtlis old: £120ovno Mark G6PMN. 071- sheeteeder for Diablo. manual: £75. Take both: 12M plug-plug leads: £1. G8NEY. (Coral-am) 0225 PSU: 210. (Walsall) 0922 473492. 236 8861 day 071-358 1287 eve. £150 plus cancoes. Good cond. (Warrington) 810138. • VCOM IC475H 70cm all-mode basestation. 75W. 0925 73600. • SOLD FT901. Spares for sale. Valves new. RCA • VERSATOWER BPI) • rotator. GWO, buyer 500Hz CW hlter. high stability dal Lea £990. IC900E • METEOSAT weather sat station. UMV f rame 61455: M ee_ Genuine NEC 12BY7A: £15ea collect Bridgwater. Sota 100W 2m base amp. Pace 70crelOm mobile: £600. 104SE 70cm M I. case, store. 1.5m dish. Daecom 1.7/137 ore. 6ch scan- FT901 service manual dus set ol service extender Nightingale modem. Various 2m/70cm bascerno- bi le aerials. Other bits available. Offers considered spiremic:£ £190. 1004E 70cm Mi, case. spkrimic: ning roe. Buyer collects: £260. G4KWH OTHR. boards: £25. AEA computer patch with RS232 port: I or all above. Brian G4ETN. (Pa ulton) 0761 416286 170. PLOP AR2002 scanner 25-550MHz. eeo• (Bedford) 0234 56139. £30. All plus p.p. 0302A OTHR. (*neon') 0249 1300MHz, PSU. telescopic aerial: £300. All ono. • MICRODOT II. FITTWCW term al. Mains pow. 712986. after 6pm. Bruce. G4WVX not OTHR. (Bucks) 0628 664415 aced, TX/FIX, le/ self-contained unit, built-in • SPECTRUM 48k plus Datacorcter. Both boxed • VERSATOWER P40, head unit, auto-brake anytime. green screen monitor, Owedy keyboard and al as new with RTTY TX/RX.SSTV TX/RX. Plus CW/ winches ODE rotator TH33JNR. 3ele beam: £600. • ICOM IC725, mic. Vent() used only on 20 and switching. As new, boxed, insts, connecting leads: AMTOFVRTTY/SSTV RX pegs, filter £80. AKO FT2700 dual-band Fewith duplexer and ant: £325. 80m: £550ono. eauxo not OTHR. (Wokingham) £195. Oscar 2m 7(8 wave mobile ant & coax, scanner cer tune 100-160k1Hz to R X 0-60MHz. Uniden 2830 with 100Wlinear: £285. PRO2004 25- 0734 734263. eve. boxed: £8. GW4W13T. (Llandudno) 0492 78107. Brand new: £30. Amstrad 10m FM: £30. GMOBVF 1300MHz scanner. no mods with royal discone: • ICOM ICR70 RX with FM unit and CW later • MINISCRIBE 40MB 40MS hard disk. controller. OTHR. (nr. Lockerbie) 05763 494 £250. LCL 10m FM: £30. Hygain IBAVT 5-band 2350. AR2002: £325. Both exc.cond. boxed. An- cables, insts. Unused, packing still sealed: £165. • SR/GO cc-yr. Off ers. CPC6128 mono many ex- vert ant: £85. J RC JST125 superior H F rig, CW fills. drew. 08AX0 OTHR. (Leiston) 0728 830462. 4CX250 4m PA easy mods to ea incl blower. PSU pansion bits: Sensible offers. G4RGA OTHR. matching spiv unit, hardly used: £800. Trio A1230: • ICOM R7000 with remote control and HF board part built, all components: £50. Old Thorens record (Taunton) 0823 664911. £135. (Letchworth) 0462 674437. installed. Little used: £725. Richard G4RHL (Dur- deck with heavy cast platter: £40. Offers. pix WHY? • Standard 0500. chrgr, reed pack: £250. Home- • WESTERN DX penetrator aele tnband beam. ham) 091-384 1840 day 091-584 643$ eve. (Bridgend) 0656 665225. brew HF ant tuner: £25. 081-886 0126 day. Reasonable Conn: £90, G4ZOY OTHR. 0670 • JRC TX/RX superb: £695. Daiwa 30A PSU: £85. • NEW Era Microreader Mel morse decoder. • TEKTRONIX 535A with type-LA plug-in: £100. 811950 2e1e Gem quad: £125. 4411 Altron tower: £350. New, unused, boxed: £125ono. (London. W9) 071. Types EiFtrL piug-Ins: 230es. P6010, P6011, and • WM2000 printer 140cps, 9-pin head, bi-direc- Yaesu 2000W PEP meter. £50. Shure 4440 mic: 625 9238. P6006 probes: 225es. Solartron CD1400 scope tional, tow seeking: £35ovno. Ideal for packet. £45. Yaesu lowpass tiller 2kW:C20. Faulty K R400 • PANASONIC DR49 RX, LW/MW/VHF/FM. plus with CX1448 plug-in: £80. CX1443 plug-in: £20. Buyer collects, G4PBE OTHR. (Bedford) 0234 rotator: £50. G4SGV OTHR. (Recede) 0527 8 SW-bands, 150kHz-3DMHz. digital display, with C01400 with 2x CX1441 for spares: 240. Telequip- 64504. 545304. hibook.S/manual: £150 or may pt/each base scan- merit Seviscope S51E: £30. HP hectometer 536A: • WS No.19 eke compete station. TCS12 TX/RX I JVC GX59E video camera: £150. 'corn ICO2E lv ner eg PRO2004/5. AR20012 etc. Buyer collects £30. Eddystone880/4 with spares: £50. Pyo West- and PSU. WS No.52 RX. Eddystone £1335 held: £160. FT290 Mkt, 10W Yaesu linear, re or pays carr. Ian G7GVN. (Millorn, Cumbria) 0229 minster: £25. 8080 dey system comprises: CPV. comms.FIX. Rye heeld TX/FIX 160./1Hz, PFI TX/ mount etc: £250. MM 137MHz cvtr: £20. G3LIV 773365 after 5pm. RAM, I/0, Prom. Prom prog arid extender card: RX and nightcal. Racal TX/RX 1338. (New Malden) R1TY/AMTOR terminal unit with BBC programs: • PC compatible laptop computer Tandy model £100. Lots of precision and standard components 081-949 2317. £30. 14ft end kitchen caravan: £300. Full details 1400LT, 2e 3.5in disk drives. with new nicads and available Incl cables, resistors, caps, relays, pots, • WW2 TX by SIC tor fleet air arm. 1.5-9.0MHz, Chris. G4MXI3 OTHR. (St. Austell) 0726 850576. carry bag: rue FT29OR 2m muter:node: £210. semis and other & W e All prices ono. Jame. VFO, xtal, sidetone, twin 807 PA, battery/mains • K2RIW 70cm linear. 2.2kV PSU: £325. Will split. FT709 70cm hilt £145. FT 203 2m £110. Mutek (Stonehouse) 0453 824123. powerpack. fulty metered. KW Vanguard Tx kit 1.8-

RADIO COMMUNICATION October 1990 71 MEMBERS ADS

MHz. Goloso VFO. 807 or 6146 PA. 19' tortured •YAESU FT757GX II. unused: £710. KW1000 HF Please state cond G3DCE OTHR. (Weymouth) comma rcvr with AM/SSB/FM capability. Near to panel and cabinet. Nice club project. 6C221-M linear: £400. Mint YS60 own/PEP meter. new: £65. 0305 761156. OTH pl ease. cannot travel lar. GOJOV OT HR. 0530 meter as new. 2kW auto-bar by Heaybeard. 2x 120V HF5 vert. new: £45. Datong speech processor: • BEG, buy, borrow manual, cadrag Drake SSR I 243615. o/p. 415-0-415V, 300mA powerpack. 17' chassis. £45. All items ow lybooks, boxed. Mint Gond. rca. Can copy, will pay post. G3AZW OTHR. • PRINTER for Commodore 64 up to £80. GIJGE Numerous HT and LT tHrs. 0.5. 3.0 and 3.5A Going ORT. GW3XCR not OTH R. (Swansea) 0792 (Trowbridge) 0225 752655. OTHR. (litirtley) 4100305. thermocouple hotwire meters. 19 set meters, 19' 816088. • BIRD Thrufine modules and ai. Cuslictatt HF panels and chassis. Offers. Mense, 14 Oakcroft • YAESU FT757GX11, FP757HD unused. Boxed and VHF aerie. Maybe pl/eocli some of LP coilec- • PYE P5012.service manual to purchase or loan. Road. Lewisham. with ail manuals: £1350ovno. G1DDH OTHR. ton? 0467 25365 after 8pm. 03KZU OTHR. (Oxford) 0865 63000. • YAESU 747GX HF tea chit m/mount. Full SSB/ (Richmond. Yorks) 0748 850231. • Celestion 6.54ln etbptical soh: - fitted: reel-to- • R1155'N' in GWO with PU etc. Also Pye MF5FM AM/CW/FM modes and manuals. Little used. VGC. IIIYAESU F1755, with PSU, HF mobile, 50W. An reels? Mark. (Gillingham, Kent) 0634 30822. high bend in spares cond (good cots. Bons. 07E1011. Reluctant sale: £525ovne. ORO HF linear amp bands. Working but tatty, hence: £125. GONGG. • COLLINS 7553 or 755313 rm. No mods, no not OTHR. (Leeds) 0532 584903. Ftedifon 6139 1.5kWcont riding Ow manuals. V.high (Stanfordile-Hope) 0375 670841. drillings. in GWO. Your price paid. GOGGI OTHR. quality. V.reluctant sate, good home only: £550. No • YAESU FT77 as optons + FV707DM, both (Kirkbyiln-Fumess. Cumbria) 0229 89635. • RACAL linear amp TA940A or similar. Also offers. GWOGGW. (Bangor) 0248 600766. mimeo: £430. TET HB35C tribander Sete: £140. • Dressler ARA30/1500 aerials. G8D01. Racal 1772 AX cond immaterial. WHY? G6XNC • YAESU 757GX tcyr, FC757AT sut ant tuner. Versalower P40: £150. GOAYD. 09856 274. (Portsmouth) 0705 413430. OTHR. (Bromley) 081-462 4481. FC700 PSU. SP102 splu. YM38 base mie and • YAESU F1790 with 30W Meal: £300. 70cm • EARLY wireless sets wanted. Also horn speak- • SEM Transmatch. Prefer with Ezitune Mtc2r3. masthead ;interne: £70. FT29OR with 25W linear, hand mic. All like new. Boxed: £775. GOIOK 01 HR ers, not sots, valves, clandestine radios. Any cond, G3CDC OTHR (Netts) 0777 871062. (NW.London) 081.904 3282. extras: £300. Yaesu at/mount and powered base will collect. Jim G4ERU, 5 Luther Rd, Winton. • TOKYO HI-power HL160V. G6NWF not OTHR. • YAESU F L2100B li near: £475. Yaesu FL101 TX: mount: Offers. 2m 25W linear: £60. layo 435 Bournemouth, Dorset. 0202 510400. (Birmingham) 021-471 3243. £200. Both v.low mileage. Yaesu F RG8800: £500. thecittne pwr meter VHF/UHF: £80. Tonna 2m/ • ELECTRONIOLJES gen.cov FfE Ocupas. Manu- New cond. G4FOF OTHR. (Hunstanton) 0485 70cm 9/ 1 Bete: £45. 2m 12ele ZL. amazing perform- als to buy or copy for R2I0 and SE Labs SM111 • TRANSMITTER FL101 to complete 101 fine-up. 532836. ance: £50. 2m Mr: £20. Weather satellite cvlt 136- scope. Tony. (Worcester) 0905 641759. Must be in GWO. John, G7ELX OTHR (Leeds). • YAESU FL2100Z 1.21rW PEP linear, perfect. 138 to 144-146: £45. BBC computer Teletext adap- • ERA Microreader, Yaesu FC901, SP901 arid 0532 569294. with operating Manual: £450. FRB757 relay box: tor: £50. Sideways ROM board: £20. Modem 300/ YD148 mie. Also Yaesu Y0901 muitiscope or • TRIO ST2 baserchrgr to suit TR2500 Mr. Also £8. Sinclair ZX Spectrum+ with Timex printer: £65. 300 1200/75: £85. Various KEF splits B139 etc: similar scope monitor. Dave G7HWW. (Norwich) masthead preamp lar 2m Peter G7FWP. (Keighiey) Carr at cost. Steve. GOLRI OTHR. (Cheltenham) Offers. G8D01. (Portsmouth) 0705 413430. 0603 745512. 0535 600500. 0242 680248. • YAESU F190201.1 AM/FM filters, recent align- • EXTERNAL +Jena] loads tote Motorola MX300 • YAESU FLDX400. FRDX400: £240pr. Nascent ment. valvas: £570. Comex-ea. 2m station. CTE IV series. 2 toads req'd Also balls toril same. Tom. • VALVE radio 1920s Hal set, morse keys, 1: £12. Tandberg Moir tapedeck 3041X: £15. held matching 30W linear Hansen sea bridge. GM1XHZ OTHR. (Montrose) 0674 76503. sounder. Early phone equip. Your price or see etch Tektronix 545A scope: £100. G4AZO OTHR. Jaybeam vert ant coax. immac: £190. Daiwa • FC757 auto ATU. G4YRR OTHR. (Stoke-on. advert. Also reed Ccrlar TXJRX. Must be good cond (Woking) 0483 721849. NS660P pwaswr meter, immac: £95. Diamond Trent) 0782 395017. R1000 HW8, G4WJB. (Peterborough)073343021. • YAESU FRG7700 little used. Immac cond as 0707 5001diz-1. 5MHz active ant complete with • FC757AT immac Will pay £225. Steve. GOLRI, • VLF unit lor RA17. G4RGA OTHR. (Taunton) new, boxed with manual: £250. Phil_ (Scarbor- PSI.1 approx 20dB gain throughout, immac: £70. OTHR. 0823 664911. ough) 0723 864499. Reason for sate, going ORT. John. G4Y DM OTHR. • FILTERS for FT201 types XF90C and XF90B. • WWII spy sets, also later models wanted or exch • YAESU FRG8800 AX, as new under guarantee: (Washington) 091-416 2606. Also VFO FV201 and Mr FTV6505. G4BZIOTHR. for German WWII equip Write G Huertos. Box £525. FRT7700 ATU: £35. Redifon GR4101- SSB • YAESU FT9020M HF tcyr cAv SP901 matching (Chester) 0244 351357. 2129, 0-8990 Lindau, W.Germany. 010 49 4223 TRX with matching PSU: £90. Minolta 7000 autoloi ekr. vcc. brand new spare PA/driver valves. OC • FT7570 X. HF linear amp 2100Z or 922 or slink 2856 cus outfit incl databack, ER case, zoom tenses 28- pwr lead, senrice manual: £575. Buyer collects or lar. MFJ989C tuner or similar. 0704 880345. 70mm, 35-70mm. 70-210mm. Hash. as new: £450. pays/arranges carr. GODLF. (Northampton) 0604 • G1 FAZ urgently seeks 5 Crookes Radiometers. • YAESU analogue csock. Must be in On' tend GINAX OTHR. (Plymouth) 0752 775375. 831061. Glass encapsulated device utilising solar/light/heat G3AXK OTHR. (Ramsgate. Thanet) 0843 593546. • YAESU F1101 HF SSEtrAM/CW Cm. Looks • YAESU FT902DM: £450. FC902 ATU: £150. source to rotate sel of vanes. Usually/once sold in • YAESU FRG7(CR) Service and operating brand new. mint. 80-10m: £265. ?Offers. GOFDV SP102 ex spiv: £35. Yaesu MOI desk mic: £40. some shcps/stores, but now it seems. extinct. Can manuals to purchase or loan for copy. All expenses OTHR. (Dunstable) 0582 606173. Squeeze electronic keyer: £50. GOERS OTHR. you help me please? Chris Williams. (Birmingham) paid. G3XHM. (Ryde, IOW) 0483 66607. • YAESU FT1012D AM fitted narrow CW filter. (Tonbridge) 0732 351313. 021-236 8831 x2137 clay 021-471 1860 eve-irae. • YAESU FT73OR UHF. loam IC24G VHF tea Im mac cond, boxed with manuals. cAv FC902 ATU. • YAESU gear. orig.boxes, FRG7700 with ATU • GRUNDIG reel-to-reel tape recorders particu- Must in good cond env h/book. Mike Watson, Best offer over: £550 secures. Marconi sig.gens and VHF eve: £270. Humphries GOLIE, 3 Abingdon larly TK9 and TK12. Also horn loudspeakers and G8CPH OTHR. (Ipswich) 0473 831448. TF1440, TF801: £30 the pair. GOMVS OTHR. Dr, Caversham Pk. Reading, RG4 BRU. pre-1932 radios, incl sial sets. Copies of Grundig (Sutton. Surrey) 081-644 8249. • YAESU noise cancelling mie: £20. Adonis tape recorder books and manuals. Mike GtICTJ. • YAESU FV1020M ext VFO wanted to complete • YAESU F1200 HF tcyr covers 80-10m: £150. AM503G compressor me: £30. Dressler 2m mas- (Hinckley) 0455 250570 anytime. lineup, must be exocond. Will pay good price. Haltr,reflers 527 VHF rcia 27-144MHz: Offers. thead pree n with erica: £50 Model VV203 GAAS. • HELP to stop my K R6OORC rotator monitor from GOFIlW. (Devon) 05986 445. GODFA OTHR. (Bognor Regis) 0243 586836. G I VXW OTHR. (Halesowen) 0384 65614. going round in cactes. Postage refunded. G4YZH • YAESU FT200. recently overhauled, new PA • ZYCOMM 2rn h/h FM only with extras: £85. 2x Fit OTHR. (Scunthorpe) 0724 732226. valves etc. cAv mains PSU and spkr: £245. 03L/01. W portables. 1 UHF: £25, 1 dual standard DX TV • HP peer heads L86A series, any considered. OTHR. 0234 750050. bands 16111: £70ono. Toyo 100W I-503MHz dummy HP1821 or 1401 or 1801 main borne. Plug-ins • YAESU FT2I2RH 2m nobile, 45W, timers old. load not req'd: £40. GW8YJN OTHR (Haver- 855813 or 8559. HP leads connect HP342 meter to Multiple lookers: £100 below fist £250. G3XEN. fordwest) 0437 781265. above heads mie anenualors. Mixers. Directional EXCHANGE (Sutton Goldfield) 021-353 3364. couplers. Microwave 1-18Gfitz preferably 10- • YAESU FT224 2m FM 15ch. Ideal mobile ng: 18GHz SMA. Consider 20-24GHz 40-47GHz £50. 04MWN. (Melton Mowbray) 64678. waveguide. Scope plug-ins 1821A and 1801A. • 10M mobiles. 40e. Also multimode 120th. Amp • YAESU FT225R 2m ni/mode base, VGC. cAv Marconi TF 6055C 60565 60588. or 6158A 6155A to suit both. approx 80W. Exch for best scanner or leads. manual: £400ono. Chris, G7EYS OTHR. WANTED 61568. TF2337A distortion meter. TF2304 modu- 2m/70cm TX offered WHY. Neil 04SEN. (Congle- (Portsmouth) 0705 262383. lation meter. SMA cables flexible and semi. rigid ton) 0260 275192. • YAESU FT225RD, Mulek board, mint cond: transitions N WC16 SMA WCI6. G3BNL OTHR • CAMERA gear, Nikon 35 rnm or medium format. • 2m mulbmode basestation rig, any model con- £600. Yaesu FT780R, good cond: £200. Tokyo (Brackley) 0280 703512. Bronica.Mamiya. Roller etc WHY? Have Kenwood HL160V li neat: £150. KR500 elevation rotator: £95. sidered but must be mint GOMHO OT HR. (Combs) • com 720A plus FM Must be 1st class cond.. 5305 TX, VF0240, FC902 ATU, AMD Honing Heathitit PEP pm meter: £25. Wok GMFA 144E 0733 230088. Absolutely no faults. Readverbse due to time HM307 scope. Yaesu VHF TX 290R, ICR7000 AX • 2M mule mode TR9130 or equiv. Also 50MHz rig masthead preamp. still boxed: £100. Welts pwr wasters. GOJAU OTHR. (Banbury) 0295 250169- with HF and remote controller, mint. Amstrad meter 30.500MHz: £25. 9ele tonnes: £15ea 21e1e or Mr for 2m plus ant. Phil, 0780H OTHR. (South- • ICOM IC271E or similar. Hornsea ARC. Jett. PCI512 30meg hard disk, colour monitor and ampton) 0703 734648 eve. tonnas: £20ea. 4-way pwr splutter 70cm: £35. 4. 0964 513311. DMP3000 printer. All boxed, manuals and in • A small pwr pack st/table for 82 TX/FIX. Please way pwr spline( 2m: £35. Datong speech proces- • ICOM ICR9CCO or AOR3000 corm rm. J.House, exc.00nd. G4TWO. (Canterbury) 0227 463316 ove. advise it any units available. G3JIC OTHR. 0744 sor: £15. Gordon G8TPR not OTHR. (Harrow) 081- 4 Elizabeth Way, Kenilworth, Warks, CV8 10P. • DRAKE R4C. MS4, Shure 5261. loam 1050 23916. 864 8261 anytime or 0831 354357 day Mon-Fri. 0926 54556 anytime. linear sers meter. Full mods. Metal lathe. IC24G. • AERIAL tower mast. Heavy duty telescopic H- • YAESU FT29OR Mute F/E, nicads, chap, c/ • KENWOOD R2000 or Yaesu FRG8800 rcvr. 10245E multimode. See wanted advert. G4WJB. ewer, 40-60ft preferred. in good cond. Chris. case. boxed. 35W linear. 5.18wave mobile ant. 5XY Realistic price G3CGO (Luton) 0582 25519. (Peterborough) 0733 43021. GWOMOI not OTHR. (Anglesey, N Wales) 0248 beam: £300ono. Or pVexch HF ng WHY. G7ELJ • KENWOOD SP940 spiv, HS5 phones. Morse • FDK700EX 2m FM mobile 25-1W scan tone OTHR. (Suffolk) 0449 781277 eve. 852420. key Eddystone Sideswiper. Must be mint cond. offsets elc. Exch for mint FT203R, TH21E. 1C2E or • AKAI 1/4in video tape recorder andior manual, • YAESU FT29011, as new, never been used: Tony, G4KHT OTHR (Hull) 0482 843457. similar Mt Top controls only. (Brightlingsea) any model considered. Also require service manu- £250. G3ZFZ OTHR. 0229 474147. • KENWOOD TM721 dual bander or standard 020630 5851. als for VTRs. Sony 3620, Hitachi SV6100K, Na- • YAESU F1480 2m 10W multimode: £230. 5200 50W version. Details pl price and cond to • FERRANTI AF3C and AF3 transformer wanted. MMT432/144 tve multimode 10W: £100. 2m 30W tional NV3085. Sony U-Matie VP2030. G8UOJ Ray, 01 VAS OTHR. (Bnstol) 04545 2768. Exch or good pace offered Lithertand G41MT. MML30 Meer amp: £50. MTV435 AN 10W TX: OTHR. (Oxford) 0865 735821 • KENWOOD TS830S_ Good price paid for rig In (Chippenham. Bath) 0225 891254. £103. MMC435 cvlr ATV: £20. Pye Lynx camera: • AP 1086 Issue One 1938/1952 RAF stores Ref pristine cond and guaranteed in perfect WO. • FT727R dual-band VGC, an ecos for 2m Nos. All Sections particularly 10-10A to 10Z relat- £20. R Weston GOLIB OTHR. (Radslock. Bath) GOFDN. (Watthamstow) 081-521 1648. multimode. GIJGE OTHR. (Batley) 4100305. ing to radio, radar and navigator' equip le Balas, 0761 32857. • MORSE reader/sender tonna. Coadmaster. • G4MH minibeam with fittings, small rotator all in • YAESU F1707 100W. FP707 PSU, FC707 ATU: Oboe. Loran. Gee. H2s etc. Exc. paces offered. WHY ? Please wnte. Am phone deal. G2LV, Tower good order. tor 10/15r2Om quality earl ant. Norman, Would purchase post-war to current magnetrons, £550. GOHYT. (Sunbury-on-Thames) 0932 mew Park. South Melton, EX36 4 EP 07695 2495. GOIRK OTHR. (Surbiton) 081-390 2650. klystrons. TM cells. TWTs, photo multiptiere, most • YAESU FT707 HF tort, 80-10rn Mel WARCierth • N1CAD batt pack NP6 or NP9 for Bolcom LS202E • TRIO R2000 AX 100filiz 30MHz feted VHF Mt CV types, and special types of EEV. Ferranti, FM board: £350. Dave GONIL. (Slalybridge) 061. G4BLL OTHR 0484 431354. 118MHz 17541Ftz for FT290 or 2m TX/AX Varian, Mi0V. RCA valves. M.Gee. 17 Foxley Cl. 303 0409. • PAIR old tow impedance diaphragm type phones. G7AAS OTHR (London) 081-749 8530. • YA ESU FT73R 70cm hai with FNB11 batt pack. Mounded Est, Ferncliff Rd, Hackney. London, E8 Must be split headband with narrow diameter ear- • TS830S immac. CW filler, deluxe knob, mie. 18mths old: £200. G 1 ORG OTHR (York) 0904 WN. 071-254 9083 or 071-790 2846 anytime peice support rods. Old RAF type ideal. MTGE into manual. boxed. Value £695. For IBM AT computer 421392. • AR77E RCA valved rcvr. Need not be working. on Grundig Saida 1400 contins rcvr. Valved system. GOGUL OTHR. (Coventry) 0203 450476.

so -88dBm at the receiver input represents an acquire new skills and to stimulate the interest C ). EMC S9 + 5dB signal! On 50MHz, the EMF from a of young people in a worthwhile activity continued from page 55 half wave dipole would be 2.88 limes larger directed at encouraging them to pursue a A piece of equip ment which complies with (see EMC Matters April 90) and the interfer- technological career to provide the next BS 6527 'B' limits could produce interference ence signal power at the receiver input could generation of industrial and research engi- at certain VHF frequencies with a field be -79dBm. neers. strength of up to 30dBpV/m (31.6pV/m) at a Finally I must again thank Ron Broadbent, distance of 10m. If this is a narro wband G3AAJ, particularly for the absolutely emission such as a clock harmonic which falls C D SATELLITES dedicated effort he put into making the within a VHF amateur band, it would be a far Colloquium so successful. It was very continued from page 53 fro m insignificant signal! On the 144 M Hz gratifying to see him presented with a clock band, for exa mple, a half wave dipole would at its best. It fulfilled several of the most mounted on a wooden board on which was a give an open circuit EMF of 21pV in such a important objects of amateur radio, viz., to suitably engraved plaque. A well deserved field, or about 10pV into 75n. This represents demonstrate to the professional community memento for his dedication. To Jackie Brooks a power level of -88dB m at the receiver input that radio amateurs can contribute to the and Martin Sweeting and all his staff, may t on (whether 50 or 75f1). The 1990 IAR U Region development of state of the art technology and behalf of all the delegates thank those who 1 conference (see June 90 RadCom p11) has techniques; to provide training by direct helped make this occasion so pleasant and defined S9 as -93dB m for 144 M Hz and above, participation in order that radio amateurs can successful.

72 RADIO COMMUNICATION October 1990 EVENTSDIARY rryeri19,y(EvErer2- DIAR'YEVENT DIARYEVENTS DIARYEV

"Inchon Valley RC - 12. talk -EMC"; 26, talk STAFFORDSHIRE Details from B. Mee, GW7EXH, Anncort, CLUB NEWS "Power Generation • past, present and 'Stafford & OARS • 16. quiz; 23. JOTA Hylas Lane, Rhuddlan. Clvryd. LL18 SAG, tel . future". Details 0703 736784. debriefing; 30, construction evening. Details 0745 591704. DEADLINE - Items for inclusion in the 21 OCTOBER "Three Counties ARC - 24, talk "Techno. 0785 662350. December 1990 issue must be sent to Thriller Wnting". Details 0428 723415. IlBlackmore Vale ARS Grand Sale. Chariton HQ marked "Club News - DIARY", to SUFFOLK Musgrove Village Halt. near Wincanton. Somerset. Itam to Spm. Talk m on S22. be received by 18 October latest. If HEREFORD & WORCESTER PFelixstowe OARS - 1, talk "Do you know how Details from Norman. G4YXX, tel 0963 news is received by the published IBromsgrove ARS • 9, constructors lair; 23, fast its going? Details 0473 642595 32389. deadline, it will appear in the listing. It talk "Microphones". Details 0527 503024. Ilpsvech RC • 10, Museum & JOTA planning, IBromsgrove & DARC 12, lath "Simple R is your responsibility to ensure that 31. talk "Solid State Devices" Details 0473 11 NOVEMBER Measurements". Details 0527 33173. 42072. items are sent DIRECT to HQ in good "Vale of Evesham RAC • 4, talk "Reliability". M ARS Birmingham Mini Mobile Rally - time. News items should be sent in Details 0386 860202. SURREY Stockland Green Leisure Centre, Erdingion, Birmingham. Details from Norman. G8BHE. writing, preferably typed or written Working a DARS - 15 to 20. Mole Valley tel 021 422 9787. legibly, and be signed by the club HERTFORDSHIRE Festival, Details 0306 77236. secretary or the person responsible for icheshuni & DARC • 3. talk -Packet Radio" "Sutton & Cheam RS • 8, inteeclub quiz: 18, 17 NOVEMBER by Mike Dennison. G3XDV from RSGB HO; junk sale. Details 081-6449945. publicity. >Carrickfergus ARG Rally, Downside 31, junk sale. Details 0992 464795. >Surrey Radio Contact Club • 1, surplus Community School, Downside Road. NOTE: This is primarily a service for 'Stevenage • 2. talk ''Ham Radio Texas equipment sale. Details 081-647 9301. clubs affiliated to the RSGB, to whom Style"; 9. talk "2m Wavemeters. HF Dummy 'Wimbledon & OARS - 12. surplus equipment Carraddergus, from mid-day to 4pm. Details 09603 66109. priority will be given. Load, Low Pass Filters", 16, talk "Satellites". sate: 26. AGM Details 081-330 2703. Details 0438 724991. 18 NOVEMBER ABERDEEN INerularn ARC • 23. talk "GB2SM" Details TAYSIDE 0923 262180. IlDundee ARC - 9, AGM; 16, talk 1113edgend & DARC Annual Rally • Bndgend Aberdeen ARS • 5, junk sale; 12. mini. Recreahonal Centre. Details from Don, InNehm,m•Haffueld ARC - S Nov, Construction "Propagation": 30. talk "Military Affiliate Radio lectures; 19. beginner's night; 26, talk "Novice GW3RVG. tel 0656 860434 alter 5pm contest. Details 0707 324958 System". Details GM4FSB,OTHR. Licence". Details 0224 780519. /West Manchester RC Winter Rally at Bolton WARWICKSHIRE Sports and Exhibition Cenbire, Bolton. Details AVON HUMBERSIDE from Dave. G1100. tel: 0204 24104 (evenings "Mid Warwickshire ARS - 9, talk and demo "Bristol RSGB Group - 29, AGM. Details >Goole R&ES 5, Visit horn RSGB Council only) Bristol 513573. member; 12, junk sale: 19, visit lo Leeds "Amateur Radio Computing"; 23, talk "Homebrenv". Details Kenihvorth 513073. >Gordan° AR Group - 24. AN Show. Weather Centre; 26, visit to local repeater 25 NOVEMBER site; 2 Nov. discussion "Contest Linear IStratford•Upon•Avon AS • 8. talk "Electrical Ouanlocks & Mendips. Details 0272 853849. "Bishop Auckland Radio Rally • Sunny Dale ISouth Bristol ARC • 3. computer and audio Design". Details Goole 769968. Safely"; 22, talk "Regionl and WARC*92'. Details 0608 82495. Leisure Centre. Shildon. Bishop Auckland, Co bring and buy: 10. ATV activity; 17. Home Durham. Details from Ernie. G4TYF. tel: 0388 Blew bring and Display: 24. 2m CW activity ISLE OF WIGHT 607500. evening. Details Whitchurch 832222. 11Elinstead ARS • surplus equipment auction WEST MIDLANDS first Monday each month; quiz night third Koventiy ARS • 5. AGM; 19, talk "Packet 20 JANUARY 1991 BEDFORDSHIRE Details 0203 523629. Monday each month_ >Oldham ARC Rally - Queen Elizabeth Hall, "Bedford & DARC - 2, talk "Etching"; 9, 'Midland ARS - 16. AGM. Details 021 443 Civic Centre, Oldham. Details from Kathy, social; 16. talk. "Double Sideband-: 23. AGM. 5157. KENT G4ZEP, tel: 061 624 7354. Details 0234 286443. 'Solihull ARS • 18, AGM. Details 021-783 1113romley & DARS • 16. talk -Linear 2996. IlDunstable Downs • 5, Constructors Contest; Amplifiers" Details 081-462 2689 9 DECEMBER 19. 0 & A evening: 2 Nov. iunk sale. Details IStourbridge - 15. talk "Sound Recording" IMairfstone YMCA ARS - 19, lark "PMR". Iffeeds & DARS Christmas Rally. CIVIC Hall, G I NWZ. OTHR. Details GOHTJ, OTHR. Details 0622 676776. Damnons Corner, Pudsey. From 10.45am, IIShefford á CARS - II, talk "What's on 80?": W olverhampton ARS • 9. JOTA pre-planning; 18. Junk sate; I Nov. talk "The New Oscars", 23. junk sale. 30, AGM. Details G4WAS, Details 0532 585801 LANCASHIRE IlVerularn Chnsimas Rally - Hatfield Polytech- Details 0767 80043. G6AKN, G4RVK, OTHR. IFylde ARS - 11. talk "Clandestine Radio". 8 nic. 1 lam - Spm. Details from Steve. tel: 0923 BUCKINGHAMSHIRE Nov, equipment sale. Details 0772 635464. WEST YORKSHIRE 249456. "Aylesbury Vale RS - 3, Construction contest. 'Preston ARS 4, talk "Kent Morse Keys"; Nteighley ARS - 9.08 A evening: 30. junk 17, talk "EME Techniques on VHF and UHF"; 18, talk "Radio Test Equipment" sale. Details Bradford 496222. 27 JANUARY 1991 31, quiz at Chesham Club, Details 0280 Wontefract & DARS - 6, Raynet - Went Valley >University of Lancaster ARS & Central Lanes 817496 LEICESTERSHIRE Hike: II. talk "Phasing Transmitter"; 18, talk ARC. The Lancastnan Rally - Lancaster Um. 'Leicester RS • 15, lecture. subject TBA: 22, "Austrian Amateur Radio". Details 0977 vetailY. Details frOrn Sue Griffin. GlOHH, tel. CHESHIRE preparations for Leicester Show; 29, RSGB 792654. 0524 64239 or Mike Sherlock. G4ZYN, tel "Warrington ARC - 2, beginners night. Details Video Details 0533 878561 Moen Valley ARS - 4, surplus sale; 18, ten 0257 452287. 0928 715070. pin bowling. Details 0274 875038. W oodlord (RATEC) • 1. talk "UFO Update"; LINCOLNSHIRE ITodmorden & OARS - 1. talk "Guess where 3 MARCH 1991 15. talk "IC Fabrication"; 29. talk "VHF Power "Lincoln SWC - 10, talk "HF Antennas and I've been"; 15. video "Summits Burning' 11Welsh Mobile Rally - Barry Leisure Centre. Amplifiers". Details G4SFU. OTHR. Feeder Systems" by Louis Varney, G5RV Details Halitax 882038. off Holton Road, Barry. Details from Ceri. Details G4SLG, OTHR. W hite Rose RS - 3. auction; 17, talk GWOJCB, lei: 0446 721304. CLWYD -Interference Suppression". Details Leeds IlDelyn Radio Club 9. Demo by equipment LOTHIANS 435948. 24 MARCH 1991 manufacturer: 23 Cheese & wine evening. "'Lothians Radio Society - 10, new member's 'Pontefract & DARS Components Fair, Details 0244 819618 night; 24, visit to Torness Power Station. WILTSHIRE Carleton Community Centre, Carleton, Pon- )Trowbridge & DARC - 3. talk "BBC Wiltshire tefract, Details 0977 615549. CORNWALL Details GM4DT1-1, OTHR. 'Telegraph RC • New club meets Longnggend Sound and Data Systems". Details 0380 "Cornish RAC - 9, Constructors workshop. each Tuesday 7.45pm. Details 61,14LoLt 830383. 31 MARCH 1991 Perranwell Village Hall OTHR. >Centre ot England Easter Amateur Radio Rally • Motorcycle Museum. Bickenhill. nr CUMBRIA NORFOLK NEC Birmingham. Details from Frank Marta "Eden Valley RS - 25, talk "Satellite G4UMF. tee 0952 598173. Communications". Details Culgailh 260. IFakenham ARC - 2. Moonbounce; 14, 6m MOBILE RALLIES activity station; 16. talk "Amateur Television" 14 APRIL 1991 DERBYSHIRE Details G8FTP, OTHR. This is a list of all rallies, exhibitions "Trafford Rally 'The Great Northern Rally" - liDerby & OARS - 3. junk sale: 10, visa by INodoht ARC - 3, talk with Zonal Council and conventions notified to HO (as at G-Mes, The Greater Manchester Exhibition Birketts of Lincoln; 17, talk "Small scale member John Greenwell, G3AEZ; 7 Oct, press date). Items are given in detail Project Year at Hewett Sc11001: 10, talk and Events Centre. City Centre. Manchester combined heat and power - making your own for the next three months inclusive and Details from Graham Oldheld, GI UK. tel: 061 electricity"; 31. Halloween Cheese and wine. "Science for All"; 24. talk "Towards a Cleaner 748 9804. Details 0773 852475. Oscillator"; 31, debate "Who needs contests in brief thereafter. Please send in amateur radio?". Details 0362 850591. detailed information, including contact DEVON callsign and telephone numbers direct 9 JUNE 1991 I122nd Elvaston Castle Mobile Radio Rally - "Axe Vale ARC • 5, AGM; 2 Nov, talk "Trip to NOTTINGHAMSHIRE to HQ and marked 'Relly News - Elvaston Castle Country Park. near Derby. USA". Details GOGHH, OTHR. PARC of Nottingham • 4, activity; it, DIARY'. Details from John, G4PIY. tel 0332 767994 - 'Exeter ARS - 8. AGM, Details 0392 78710. construction evening; 18, foxhunt on foot. 25, Trade enquiries to Peter. G3WFU. tel 0332 talk "Satellites"; 1 Nov, talk "Using ESSEX 700265 (evenings). Oscilloscopes". Details 0602 733740. 7 OCTOBER 'Chelmsford ARS 2, AGM, Details 0245 11GPT ARC - Now back after recent burglary. "Armagh & Dungannon DARC Annual Rally - 30 JUNE 1991 260831. Meetings Thursdays, 8pm. Details 0602 Drumsill House Hotel, May Road. Armagh. 11Cotchester Radio Amateurs • 11, AGM; 25, kongleat Amateur Radio Rally. Longleal 226321. Doors open 12 noon Details from T.E. Hall, talk "The RSGB Morse Tee, Details 0206 House, near Warminster, Wiltshire. More 'Mansfield ARS • 4, talk "The History ol GIOMS.J. tel: 0861 523454. 851189 Computers". Details 0623 766288 details from Shaun. G8VPG. tel: 0225 >Blackwood AR Rally • Oakdale Community 873098. GREATER LONDON College, Blackwood. Gwent, NP2 013T. Details POWYS from B. Matthews. GWOJWF. "Acton. Brentlord P. Chiswick RC • 16, VHF 29 SEPTEMBER 1991 "'South Powys Radio Club • 2. AGM, plus talk 'Great Lumley Radio Rally - Community operating night. "Harlow ARSE Mobile Rally - Harlow Sports "Panel Marking Techniques". Details 0874 Centre. Great Lumley, Nr, Chester-le-Street, liCoulsdon ATS - 8. quiz y Sutton & Cheam Centre. Details Irom - weekdays - All, G7FNY Co. Durham. Doors open I 1 a.m. (10.30 for RS, Details 081-684 0610. 84266. on 0279 418392: evenings & weekends Mike. disabled visitors). Trading Stalls, "Crystal Palace & CRC - 20, talk "Test G7BNE on 0279 722569. Refreshments. Entrance fee 50p. Details from Equipment and Filters". Details G3F2L, SHROPSHIRE OTHR. "Telford & OARS • 3. 50MHz night; 10, visit to Barry. GIJOP. tel: 091 388 5936. >South Devon RC. Sixth Annual Ham Radio "Edgware & OARS - 11, talk "Which Madiey: 24, packet demo and talk on "Cycle Cantee n 25. talk "Packet Radio". Details 22". 31. electronic egg race. Details Telford Computer Exhibition and Rally - Hillhead Campsite on the Dartmouth Road in Brixham OTHER EVENTS 081.205 1023. 616166. Doors open 10 a.m. Trade Stands. AR "'Sutton & Cheam RS • 8, inter-club quiz liTrowbndge & DARC • 5, talk "Mysteries of supplies. Bring & Buy. Raffle. Refreshments. 13 OCTOBER Coulsdon Club; 18, junk sale. Details GOBVW, Wire Antennas". Details 0380 830383. Unlimited parking. Overnight camping. Car OTHR, IRNARS Annual General Meeting - HMS SOMERSET boot sale (weather permitting). Talk-in on S22 Mercury, 2.30pm. followed by 30th GREATER MANCHESTER Mid Somerset ARC - 5, fox hunt; 19, talk by G7FDC and G4SSD. SES GB4CPU. Anniversary Dinner, Royal Sailors Home Club, Details from 0803 5222116 Portsmouth. Information from G3JFF, OTHR, "Eccles & DARS - 2. talk "Sheffield Today • "Studio and Theatre Lighting-. Details 0749 Details 061.773 7899. 345975. 0705 593994, "South Manchester RC - 5, Contest "West Somerset ARC • 2, quiz night. Details 14 OCTOBER preparation; 12. talk "Mass Spectrometer"; 0984 31197. PELHOEX Hamfesi - Hornsea Floral Hall. 26/27 OCTOBER Details from Jeff. G.4tGY, tel: 0964 533331. 26, talk -Cheshire Association Emergency "Yeovil ARC - 4, talk "Design and use of an "Leicester AR Show - Granby Halls, Leicester. Services-. Details 061.969 1964. Absorption Wavemeter"; 11, bring and buy Same format as last year with the two halls. sale; 18, talk -Simple Radio Controls". Details 20/21 OCTOBER Details from Frank. G4PDZ. tel: 0533 553293 HAMPSHIRE 0935 28341. 141h North Wales Radio Rally - Aberoonway or 871086. "'Basingstoke ARC • 21. foxhunt. Details 0483 Centre, Llandudno. Doors open I 1 a.m on IIFtAF ARS Annual General Meeting - RAF 69440. SOUTH GLAMORGAN both days. Entrance fee El. OAP's 50p, Cosford. Further information from Warrant IHorndean & DARC - 4, AGM. Details 0705 'Cardiff RSGB Group - 8. AGM_ Details 0446 children under 14 free. 64 exhibitors and 163 Officer M.J. Street; tel: Albrighlon 2393, exin 483676. 773212. stalls. Large bring & buy on the ground floor. 2472.

RADIO COMMUNICATION October 1990 73 EVENTSDIARY EVENIIrenfl/API INIMMINZVEVERUM DIAR YIEVER M

IGBOGSB Bnghltungsea Scout bGB2FBS Fust Bugle Scouts. G4MX8 ,GE34DOS Dartmouth District GB CALLS Group, G4EUW IIGB2FIN Finchamstead Scouts. GOBER Scouts. GOJAA bGBOHDS Horsham District OGB2FSS Faringdon A Stan' 11GB4DS Devizes Scouts. GOJVF The list below shows all special event Scouts. G4LKIN tord Scouts. GOLCB IGB4EAC Eithth Alton Club, GOJMI stations licensed for operation during this "GBOHSG Haverhill Scout Group. G3WOF bGB2FTS First Timperley Scouts, G4TEU 1684E VE Evesham Scouts, G3UEY month and up to 8 November. Il was "GBOKET Kettering Chenet "GB2GHS Glen Hills Scouts. GOJOZ bGB4FBS First Bisphern Scouts. G3GU taken from the HO computer on 6 Scouts. G4VKX 11GB2GU Guernsey, GUOBGP bGB4FCS First Coulsdon Scouts. G6HC September. These callsigns are valid for IGBOMAS Machynlleth Air IG82HDS Halifax Distnct Scouts. G3TAY "GB4FNM Ne w Marske. Redcar, G4OLK use from the date given but the period of Scouts, GW3SON bGB2HS Hertfordshire Scouts, GOHTM 11GB4FS Fleetwood Scouts. GOLRK 11GBOMSJ Mexborough St.Johriss. G4SDE IGB2ILA Listeners Assoc., GW4OXB IIGB4FSC Follions Scout Camp. GONDG operation may vary from 1-28 days. "GBOMSW Merseyside Sefton IGB2JAM Jamboree At The bGB4FSS First Stotfold Scouts. G4UKE West, GOMJG Museum, G4UDR 11GB4FTS Fust Tiddinglon 27 SEPTEMBER "GBOM WW Middlewood Worsley. G8VF 11GB2KCS 2nd Keith Cubs Scouts. GOCCH 11GB2UR U 0 Birmingham "GBONCS New Coslessey Scouts, GONWL Scouts. GM4YVFI liGB4GSG Gwersylt Scout Guild of STOTS GOHYN IG1300W11 Chosham Road. G4PMG 11GB2KIM lot Kimbollon Group. G3XNB Group, GW3HHF IGBOSGC Scout Groups Of IGB2LSG Luckey Scout Group. G40JS 1684G VS Godstrey Visage 28 SEPTEMBER Crewe, G4LVR bGB2MRS Manx Scout Radio, GD4OEL ScOuts, G4ZVA IGBOBHS Beacon Hill Camp Site G4LKW leGBOSKS Sttood Kent Scouts, GOLJD bGB2NFE New Forest East, G4SBF liGB4HEX Hextable Scouts. GONOB North West London, G3TLU Flaywards Heath ›GB2Cov Coventry Scout IGBOSOS Sbredge Oldswinforcl 1/GB2NWL I/GB4HXH Training Centre G4VVM Scouts. GOIZF IGB2N WS North Wilts Scouts, GOGKH Awards, G4WNX Ippleen Scouts. G4FCN IGB6ESC Wellington Country 11GBOSP Saint Pauls, GOAXU bGB2OS Osbaldwick Scouts, G4KCT bGB4IS Park GIZOV "GBOSS Somenon Scouts. G4CFS 11GB2POS Pennine Group Scouts, GCGSU IGB4JOA Jamboree On Air. GWOBKJ IGE16GM Grounds ol Monts Hall G6SX "GBOSSS Stoney Staton Scouts. bGB2PSG Potion Scout Group. GOAVZ IGB4JSS Jota Southport Scout, 60S8 Rubery Scouts. G4IVJ bGB4KLS King's Lynn Scouts. GOMOL liGISOMDS Rosehill Park G4YZJ IGBOTSG Tollesbury Scout Group. GOIBN IGB2RUB 168444SG 11GB2PG Abbolsford Nursing IGBIEIPM Baden Powells Mob. G7BPR 11GB2S18 Scouts In Sisley. GODBS Kirton Scout Group, 04Y0C "GB4MCS Home GMOHOF bGB1FES Fifteenth Edgware GB2SID Sidmouth. G3AOM Metherton Club Scouts. G4MUY Scouts, GI FMH I43B2S0M Scouts Of Mulbarlon. G4VCE 11GB4NCS North Convelty ,GB1NCS New Coslessey Scouts, G7HCP GB2SPX Spikworth Scouts, G3VPT Scouts. GW4YMJ 29 SEPTE MBER "GB1PGS Pontine Group Scouts, GeZTD bGB2SSS Saint Saviours Scouts, GOJOP "GBANLS 91st Leicester Scouts. G4SJX >GROG f, trie Scout 140. Lower "GBIPSG Potion Scout Group, GI3RMM "GB2STR Stratton Scouts, 04E VE bGEMODS Old Deer Scouts, GM3PIP Recreation G3MGW IGBI SES st Southoe 11, 1,GB2SWS Squirrel Wood Scouts. G3UVVR 0384 POS Parkwood Giningham Fluckden Sets, G8XSO IGB2UPG Upperby Scouts. G4EGH 1 OCTOBER IGBISP Skreens Park. G1EFL Bank Gds, G3MNL bGB4RBG Rainbow Brownies bGBOCSR Civil Service Recreation "GBISSA Sunderland Scout bGB2WAS Wallon At Stone Guides. G4XED Contr G3XWX Assoc., G4MLH Scouts. G4FRV G B4SM South Manchester. G3WFW 11GB5JL Brunet University GOLRI 'CRISSA Sunderland Scout 11GB2WCS West Craven Scouts. G3RR bGB4SS Sleatord Scouts. G3RGO liGB2VSG Scout Hia, The Bay G4KGM Assoc.. G6INK bGB2WES West End Scouts, G4ORF 11GB4SSS St.Stevens Scouts. G4IEJ "GB1 TV Triton Vandyck. G7DDD 11GB2WLS West Lancashire 1084 SST Sandy Scout Camp. 04ME0 bGB2OSG Orkney Scout Group. GM3IBLI Scouts. CMUCII 1084 SIB Scout Troop Of 6 OCTOBER bGB2ASG Astley Scouts 10132WMP West Midlands Police, G4MPG Brampton, G4YZJ IGB8CA "Leshm" Millukerr and Guides. G4GWF IGB2WP Weston Park, G4SPV IGB4SUN Sulbstead & Ulton Park Road GMOHRT 10828 OS Blackburn Division IGB2WS Wingenvorth Scouts. G3YE30 Nervet, G3KPV 11GBOCOU Fort Cumberland GODHZ Scouts., GOGSN IGEI2WSG Wymondham Scouts liGH4THT Third Hanwonh Troop. GOGPT IGEMDOID Duron Brakelunings G41H0 "GB2BEL Betchamps Scout, G3Y0A 8 Guides, G4XBT IGEMWOS Wheatley District IGBOTHS Timothy Hackworth G3LUC 11GB2BG Berrylands Group. G4ULD IGEI2YRL St. Coimans Scouts, GI3YRL Scouts, GOLUO IGB4XXX Wemol Caravan Park G4LPX "GB2BSG Blakedown Scout IGB4ASC Avon Scout Communi- 10134WST Weare Scout Group, 04011 Group, GOAGH cations, G4FFUGOGZW 11GB6CHE Cheshire County 10 OCTOBER bGB2CHI Chichester Scouts. GOKNU GO4BS Bodrnin Scouts, GOMJO Scouts, G I NWA IGB4CPU Hill Head Campung GOGOS IGB2COS Chester Oldfield IGEMBSG Bentley Scout Group, GONFA IGB6RS Rugby Scouts. GOJEW 1GB75ST lan Fraser House G3SEJ Scouts, G4YCA IGB4BUX Buxton. G41H0 bGB6TS Tai-poney Scouts. G4FOH 11GB2CST Chalgrove Scout IGB4E1VS Boughton Village "GB8BS Bicnacre Scouts, G4ZPE 12 OCTOBER Group. G3SEIM Scouts. GOGCO G B8CS Clevedon Scouts. GOCEN "GB2CT St Nicolas Scouts. GI3YRL IGB4CGB Chelsliekt Girl Guides. GOAHl G B8FJ Fakenham Jamboree. GODSN liG13 1 CC Coltenham Race G4LVO GEWCHE Cheshire Scouts, GOMIX 11GB8JAM Jamboree. G4SJX Course 08XS0 11GB2DS Dromvich Scouts, 1101320S43 Denmead Scout IGB4CHV Chinnook Hercules 11GB8M WW Mddlewood Worstey, G7ELA Group. GOK DB Victor, GOHOX 11GB8RS Radio Scouts. G4YKA 14 OCTOBER "GB2EBS East Birmingham 113B4CSG Clapham Scout Group. GOBMG ItGB8SSS Skeg Sea Scouts, G1ONN 1G1300 W CEFN BRYN GWOKPD Scouts, G4B13T Gi34DAS Dundee Ares Scouts, GM4FLP IGB8WS Wilenhall Scouts. GOKRK

15 OCTOBER 11GB4AWV Bangor Leisure Centre Gi4OFH EASTBOURNE 17 OCTOBER SCOUTS GB2AGS Hatfield Woodhouse Village G3KPU Eastbourne and District Scout Amateur Radio Group's new 20 OCTOBER shack was opened by John Fogg, bGB2IRC 1pswuch Museum GOIFF G3PHZ, Scout Headquarters' 3 NOVEMBER Chief Public Relations Officer. An IGB8CA "Lestyn" Milliken Park address was read out from the Road GMOHRT bGBOCCIL Lumps Fort GODHZ Chief Scout, W. Garth Morrison: 11G132WMP North Birmingham G4MPG I was delighted to learn that 8 NOVEMBER the new amateur radio station at GBOWOD Grappenhal , Youth 8 Bushy Wood is being opened on Community 03NFE3 Monday 23 April 1990. " Amateur Radio has an impor- tant role to play in the Scout JAMBOREE ON training programme. It increases THE AIR 1990 international awareness by helping Scouts from all round the This list of JOTA stations was, of necessity. compiled some weeks ln world to communicate with each advance 01 the event. For a complete list other. It also offers young people of JOTA stations send a large (A4 or an opportunity to learn about larget) stamped addressed envelope lo modern technology. RSGB Headquarters, marked "JOTA LIST". JOTA is on 20/21 October. " I am sure that the new facilities will be of great value not IGBOAND Ashinglon only to Scouts in Eastbourne and Newtoggen Dust. GOFBH Eastbourneand District Scout Amateur Radio Group recently opened their new 11GBOBJS Burton Joyce Scouts. G6ZRV shack. L to R: Tony, G3Z OB, John Fogg, G3PHZ, Geoff, G4YJ W, and operating District, but also to the many IIGSOBPM Baden Powells Mob. GOLAG, the rig, Nick, G7GSC. visitors to the campsite. IGSOBSJ Bonged Scout Jamboree. GOJGV IGEOBSS Bolton-Le-Sand Scouts, GONEL 161308S1 Bromsgrove Sixth Troop, GOIHT IIGBOBTS Bournemouth Town Scouts. G4WCK IGBOCBS City 01 Bradford Scouts. GOACX Jamboree On The Air bGBOCSC Crawlordsburn Scouts. GI4MDD IGSODSR Dartmoor Scout Radio. G4UTX bGBOEKS Eckington Scout Group, G3RPO 20/21 October 1990 IGBOFDS Farnborough District Scouts. GOHNA IIGEOF ES Fifteenth Edgware Scouts. G4UEM The Radio Society of Great Britain wishes all particpating IlGt3OFFS Fust Fenny Scouts, GOEYZ IIGEOFWW 1ST Wereham groups a successful JOTA. Wretton Scouts. GOFOO IGBOGD Gravesham District. G4YGU

74 RADIO COMMUNICATION October 1990 on a luggage trolley, a lattice mast as wide as a church steeple and twice the Please note that the views expressed height, with a curtain antenna corrected in 'Last Word' are not necessarily for varying wind loading by a bank of those of the RSGB. strain gauge controlled electric motors. Surely, chaps, there must be an easier We reserve the right to edit letters and the last... way, lets see if we can find one. regret that we can no longer acknowledge them individually but will Allan L Taylor, G3JMO EAST RIDING which he had not only donated but pass them on to the relevant provided the necessary instructions to department. I notice. with some regret, your new UNISEX FEES get them down to 3505 and 7028kOs. My conditions concerning the more frequent first station went on the air for less than With reference to the RAE and Morse use of 'county' names during contests. £10.00, less than two weeks' wages, and classes which are now becoming all. Whether it be run on a commercial or We who live in the bogus county of clocked up 74 countries in the first year's available again this coming autumn, it contracted out basis has got to be Humberside are not happy about probation on CW. Multiply this amount by should be noted that concessions on fees decided upon by our Society, for if repeating this loathsome and haled name 16.6, as G3MNO says, to bring it in line cannot now quote the term 'OAPs' anything went sadly wrong with this type hour after hour. Our true county name is with today's prices and the answer is because it discriminates between men of system, who would we blame! Think the East Riding of Yorkshire, and has around £150.00 which would not buy and women. Using this criterion, men can what it would be like il we didn't have an been for the last one thousand years, much now. only get concessions at age 65 whereas RSGB H.Q. for free advice, plus all the and you do not help our cause in getting Oh! For the good old days. women can get them at 60 - this is other day to day operations that take it reinstated by perpetuating the W V Heath, G3ABS discriminatory Educational establish• place within our Society and as for our disgusting name of Humberside. ments must now state 'Over 60' or monthly magazine, no magazine can In 1974 many other bogus county 'Senior Citizens'. BAD TO VERSE possibly suit everybody. names sprung up which were seized The law was changed in a test case MB Marsden, R.98.54 77 upon by such as yourselves with As I sat in my shack Sunday morning, fully reported in The Times& 15 June. It consequences that have caused much Al peace with the world and at rest. appears that Mr James and his wife from FLAG WAVING resentment. I wonder you haven't noticed From my speaker without any warning Eastleigh, Hampshire, both aged 61, I was horrified and mortified when h that your true address is in Middlesex. Came those dreaded words "CO TEST" went to their local council swimming I certainly will not take pan in any baths - he was charged 75p but his wile received the September issue of Radio future contests that insist on our club The ether so recently peaceful was let in free because concessions Communication to see on the front cover using HBS instead of E.YS., so please let A bedlam of sound now becomes. were only given to those drawing a State the Union Flag, pul below that of the us have our free counties back, the pre - A jumble of letters and figures pension. He look the council to court and USSR. The implication is obvious to 1974 areas were much easier and As the boys are doing their sums. lost. He went to the appeal court and lost anyone possessing the most rudimentary simpler anyway. again. He finally took the case to the knowledge of flag etiquette: Great Britain Edward Ball, G4L1Z0 Can this signal so weak here in Salop House of Lords - and won. What this is inferior to the U.S.S.R. If any Naval Be really S9 to the mob, means is that no body can discriminate Personnel had been present. I feel sure they would have insisted on the gags ADMIRALTY SCRAP Or has my receiver a problem, between men and women, for example I'd better try turning the knob. for education, entrance fees for parks or being worn at an equal height, on a yard. think G3MNO (The Last Word, July 90) museums, or for membership of clubs or Is it too late for an apology to the Crown was not looking very hard lor Govern• Well it seems the whole spectrum's societies. and MoD (Navy)? ment surplus in the days just after the affected. HM Holmden, G4KCC WAG Kerr, G7FTJ. war. Did he not hear of "The Admiralty From 80 through 20 to 10, (Short Of turning the picture upside down Scrap Scheme" organised by the RSGB? So I'll switch off my rig till tomorrow or sideways, there is little we could have NON -MEMBER CeLs A party of us from the local Club went to And hope peace reigns once again. & Me to have changed the order of the flags after the photo taken! However, the nearest centre, Glossop in our case, Arthur Smith G4OKL. I have read with interest letters from Mr and there you had a choice of literally Dick (Last Word Aug 90) and Mr Allen inri,,' the Ilagpale was at Seedily Island in the USSR, presumably the flags were hundreds of components and valves, LF CHALLENGE (Sep 90). My main interest is the use of morse keys and even brand-new and the OSL Bureau to non-members. How correctly positioned - Ed/ boxed 828,CR100 Receivers, aft al 55 I am very pleased to read in September many of us have sent OSL cards and shillings per cwt. We bought a 828 and a Radio Communication that there is have not had one returned, this could be FRUSTRATION set of spare valves for just over £3.00 planned a resurgence of interest in the due to the fact of the station being a non- In August's RadCom I placed an advert which included a 10 shilling "back world below 100kHz. How nice to hear member. for a PK232 or KAM ail-mode. I was very hander" for the two chaps in charge of these frequencies filled with CW after so One needs to look at this situation very pleased with the response by experi- the stores. many years carefully and no doubt the RSGB will do enced amateurs wanting to get rid of their A visit to the nearest Government How many of us, l wonder, will dust off so on our behalf. It only needs a licenced equipment What saddened me, and it. surplus store in Sheffield provided type that old rotary spark gap rig that hides on amateur bright spark, to start up a world may be a major cause for the lack of take 1154 transmitters at £4.00 each. One of the top of the cupboard. wide CISL bureau for a modest yearly up of amateur radio by youngsters, was these provided the parts for the PA and What will newcomers need? A subscription, and in doing so. may leave that in a number of cases the owners the bits for the crystal oscillator, and modilied disco amplifier and 5 miles of our Society in a difficult position. On the were giving up with frustration at not doublers had been purchased earlier at electric fence? Or a plug in the back of other hand, it may pay the RSGB to take being able to get the gear up and Glossop. The only component lacking the hifi? up this type of operation whereby it running. was the crystal and G28H had a plentiful It will be a problem for all, as the last collects some revenue from non- The instruction manuals are written at supply of old quartz spectacle lenses, real VLF rig I saw used PA valves carried members, which better than nothing at too sophisticated a level of technical jargon and there is no common ADV MSE.MiNfile.. agreement about wiring plugs to leads. For example, a microphone plug for a Yaesu FT 290 will not match the equivalent lcorn or Trio rig Computers frIÇIFFATIIErfç are wired differently from one another. I could go on, as indeed I have so on rrly local repeater_ Handbooks for packet o brand new bcok from fte radio. AMTOR, or what have you, should be written in simple English. using short sentences. Illustrations should be so "Ieft me, short-c+ breal-h 1" labelled as to minimise confusion. The Toalcuse - icietrec. KISS principle doesn't just apply to designing equipment but also describing Rxeteci, full of cartoons, how to make it work. So to those of you out there busy never published iC.P.T1G\ COM designing new black box toys for me to Availa e filtivCRSG13 SALES buy, ptease assume I think you are deserving of the Nobel Prize for reemberi?,ice £3.48 electronics, but how about trying for the Ilan-members r £4.09 Literature prize as well? A.Harada G41NX

kGeitEN - eo.t- arkst TWO WAY SENIOR Se.bdor bat ,. Having recently had a CW OSO with an bou, dorit ?e it, 80 years old Amateur in Sweden. and last year a OSO with OZ2NU who is now Jou' 11 I.i re*, reyee 84 - I was 70 on April 10 1990 - I wonder ton1.-Bfon . what is the greatest combined ages of "Dumref wAt." 'tTou tree eenifkim I know.' Hams for a two-way OSO? Perhaps I A VARTTOL 1960 could start the ball rolling with my G-.Marconi. combined ages OSO of 153 yearsl R T Glynn. G3AKZ

Order from ASIR Sales (CW0), Lambda House, Crarthorne Road, ePotters Bar, Herts. EN63JE. Tel: 0707-49855 (24 hours) Or credit card orders. •3 word

RADIO COMMUNICATION October 1990 75 1 \HATELY ANTENNA TECHN OLO GY GM 3HAT Guide to Facsimile Stations 1990 1 Kenfield Place, ABERDEEN, AB1 7UW, Scotland, UK Phone Orders, Evenings 6.30 to 9.30 on (0224) 316004 10th edition - June 1990 400 pages -£19 or DE M 50

The FAX mode gets more and more fascinating. The recording of FAX stations on LW and SW and the direct reception of melee satellites is no longer an HF ANTEN N A PR O BLE M S SOLVE D! esoteric science. New hard- and software connects a radio receiver directly to a The DIPOLE OF DELIGHT sertes of wire antennas have a well justified reputation for laser printer. The result is press photos, satellite pictures and weather charts @EXCELLENT EFFICIENCY . so that your signal can be effective without a linear amp'ile with the superior resolution of more than 2000 picture elements per scan line. (ii) EXCELLENT BALANCE ... so that you can recent, e'er of TV Time-base Hatmones and The new edition of Our FAX GUIDE contains not only the usual up-to-date computer hash! frequency lists and transmission schedules, including those of Bracknell Metes and Royal Navy London It informs you particularly about new FAX converters (I'd) EXCELLENT MATCH ... so Mat yoticidnot need louseanATU,andcan therelorespeedilymply and programs on the market, and includes the most comprehensive international The CROSSED FIELD ANTENNA is the smallest effective transmitting antenna with a wide survey of the "products" of weather satellites and FAX stations from all over the bandwidth ever made. Consequently the Ground Plane CFA can be mounted almost anywhere, and world. More than 300 sample charts and pictures were recorded in 1989 and 1990. Here are those special charts for aeronautical and maritime navigation, overcomes the small-site problem. Without necessitating a planning permit you can radiate from the agriculture and the military, barographic soundings, climatological inside a loft-space on any HF band. analyses, and long-term forecasts, which are available nowhere else. For completetectuocal deals. send Ice, First-Class stamps (or Pore IRCs) Pnces ewe Morn in the August advertisement Additional chapters cover: PieleasIceal Angoras are maastle tor MF broadcast applcabons 5CAW is Wing radiated on Merton Wee it 350 metres born a Ground Plane CFA pal 35 metres lagh Lcence to manufacture order as Patents »Pee -List of 389 frequencies - from VLF to UHF - monitored in 1989 and 1990. - Exact schedules of 98 FAX stations on 357 frequencies. Propilder. Marla C. Itahly, MSc. REE. Meted Eltculcal Eq.«. Mimed 1950 as 631f AT. New 61311111 - Comprehensive list of geostationary and polar-orbiting meteo satellites. Schedules of GMS (Japan). GOES-East and -West (USA), and METEOSAT (Europe). - Technique of FAX transmission. International regulations. - Lists of abbreviations, addresses, and call signs. Test charts. 25 The Strait Further publications available are GUIDE TO UTILITY STATIONS (16th LINCOLN LN2 1JF edition) as well as RADIOTELETYPE CODE MANUAL and AIR AND METE() CODE MANUAL (10th/11th editions). We have published our international . BIRKETT Tel: 0522 520767 radio books for 20 years. They are in daily use at equipment manufacturers. monitoring services, radio amateurs, shortwave listeners and telecommunication VOLTAGE REGULATORS 12 Volt 3 Amp Type M7E1T MK en £1.65, LM 29308. 8 Volt 1 Amp administrations worldwide. Please ask for our free catalogue, including 50p. 8'1127 WIRE ENDED 0100ES 1300 PIV 1 Amp 0)10 for £1. PLASTIC POWER TRANSISTORS recommendations from all over the world. All manuals are published in the 2SA 699. 2SC1096. 2SCI226A all at 45p each. FERRITE RINGS Int Dia 10mm. Ext Dia 20mm handy 17 x 24cm format, and of course written in English. O 5 lor £1 SUR-MINIATURE 12 VOLT 2PCO RELAYS o)., 75p each RF POWER MODULES BGY32 @ £18 95. M57710A e £1795 .CsAS FETS Red Spot e £2.50. Black Spot @ £1 85, Out el Do you want to get the TOTAL INFORMATION immediately? For the special Spec Devices @ 3 tor £1 99 N CHANNEL PETS 2N3819 e 25p. J304 @ 20p. BFW11 e 30P. price of £87/OEM 230 (you save £15/OEM 40) you will receive all our manuals BFW12 e 30p. 2N3824 nu) 30p, DUAL GATE 3N201 @ 80p. DISC CERAMICS 0 1 ul 63v.w. and supplements (altogether more than 1,500 pages!) plus our CASSETTE 200 for £1 95. STORNO BOOT MOUNTING TRANSCEIVERS FM 79 to 110 MHz 10 Channel No TAPE RECORDING OF MODULATION TYPES. Accessories e £8 (p&p £3). TANTALUM READ CAPACITORS 4.7v1. 15uf 10v w. @ 15 lot Our prices Include almull postage to everywhere in the world. Payment can be El 15. X SAND GUNN DIODES e £1.65, X SAND DIODES Like 1N23 oo 45p. SIM2 en-45p. by cheque, cash, International Money Order, or post giro (account Stuttgart 1501E @ £1.65. Tape Ended Diodes@ 6 for f 1.65. ERIE NUT FIXING FILTERCONS TYPE 1270- 2093 75-709). Dealer inquiries welcome - discount rates and pro forma 016 100 Volt 5000p1 @ 55p. ERIE LOW PASS FILTERS Nul Fixing Type 9053 -103 -0002. 100 invoices on request. Please mail your order to Yell @ 55p MOTOROLA HOOT MOUNTING NIGH SAND FM TRANSCEIVERS with Mike, Cables. Speaker etc. cm £25 (p&p £4) RF POWER TRANSISTORS Frequency Sources. GC41065-800 Klingenfuss Publications e £4.95. NEC230153 @ £4.95. BF7-35 e £5.95. PT9796A Matched Pair @ £12.95. Hagenloher Str, 14 SRF1818-2 e £7.95. BLY97 @ £3. 2Glit 50mW Transistor @ £1.15. SWITCHED MODE POWER SUPPLY 240 Volt Input; Output 5 Volt 3 Amp. 15 Volt 1.5 Amp (a £4.95. D-7400 Tuebingen ACCESS AND BARCLAY CARDS ACCEPTED. P&P. 60p UNDER £5, OVER FREE. Fed. Rep. of Germany UNLESS OTHERWISE STATED. C.M. HOWES AND WOOD & DOUGLAS KITS AVAILABLE Tel. ++49 7071 62830 BY POST AND FOR CALLERS.

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76 RADIO COMMUNICATION October 1990 ICS EIectronics

Surplu s T. Wraith Electronic e Giacomelli e tji Inent LONDON o Wales co Guide o Steer' A MATEUR RADIO Dogs rec.-boa Siskin SHO W C/3 Assn E Wireless Electronics RSG 8 o 1991 2 BYLARA o Telfo rd () G4Zpy eleCtro nics PiP1JAtis Saturday March 9th & Sunday March 1 Oth. Lu Paddle (1) Technical Keys o -o Software Picketts Lock Centre, Plcketts Lock Lane, e e 00\e Edmonton, London, N9 OAS. o y e Nevada 3 Ca co 3 .ce New Cross G-ORP Southgate A.R.C. Quartsiab 2sS . ec' Radio /Y Lee • • 4f /7 70./)"'"/) 0 e2s e Grafton R.S. EleCr° 11kc 's A.R.E. Arr04 , .17 C/) cc\ g;r: R. f3AR Photo ,Accoustics s -C3 gine ering 1:7 -T1 R.N. Electronics 'ebee4- Malsor Kits C.M. Howesfl AMSAT-UK Electronics PLUS MANY MORE THEY'LL ALL BE THERE. HOW ABOUT YOU? The organisers of the London Amateur Radio Show send greetings to the organisers of the Leicester Amateur Radio Lee Valley Show and wish them every success with their event. Lei Park Further details from The Secretary, 126 Mount Pleasant Lane, Bricket Wood, Herts, AL2 3XD. Tel 0923 678770

COMPLETE YOUR ELECTRONICS LIBRARY PRACTICAL PRACTICAL IDEAS FOR RADIO AMATEURS IDEAS FOR Ion Poole (G3YWX1 The author. o regular contributor to 'Ham Rodeo Today% goes some useful hints and tips lot orneseer rode enthusiasts in this beck There are six main uctions—dealing with the shock, genre construction. compomeas. circuits ond testing—and de book concludes Re1910 with useful formuloe and sables AMATEURS 0 85242 917 7 210 X 148 men I 28pp £6.50

SCA NNERS 3RD EDITION Pole Rove The most comprehensive guide ever published in Boom to explain in simple terms how the VHF and UHF bands are allocated to different uses h 0110 COverl equipment. accessories ond annuals and explains bout rode theory, modes, and simplex and duplex trommission grinds bandplons from 26 to 1300 MHz ore a nee( /reruns of the book, and o review section surveys the equipment currently evadable in the UK MN POOLE I 85d86 006 2 234 s 156 non I92pp £8 95

SCANNERS 2 Pert, Rouse. The companion book lo the best selling Scanners provides even more informolion on the use of VHF and UHF communications bonds and gives details on how 10 conpruCr occessones 10 improve the pedo.nonce 01 ',Conning equipment The book is 1nlern0110n01 n its scope and contains frequency ollocolions lor all three ITU regions, including country by country vonotions 2-WAY RADIO 0 852d2 974 X 23à s 156 nun ??)pp f 9 95

CUM' ERS1ON SURPLUS 2-WAT RADIO CONVERSION HANDB OOK }IA N UBOOK Ch's lorek As Siviroy odio equ.pmenr. used by itie police ambulances etc. becomes reek:iced these see become 1/4. available on the surplus 'nailer for very economic prices and they con ohen outperform purpose- designed ornoteur rodia equipment? In Mis book, Chris boo* explains how to modify them to amateur rode Irequencies He descubes the equipmeril suitable for conversion. 40# A sogether with relevant photographs and sources of supply, gives alignment and uss. e ec—di,„,'::7:.`.4'..el:," d,:d7cs.::::e:.,Zroy,".7::,',.°::,:rnts:,;Y: :: : 7,0 handbook for which rodso operators Wee been woiring 0110 , 11M, 0 85242 946 0 234 u 156 nme 224pp £10 95 de le. ,,,,p1 ' oï, ... se .709, 9•b:):::: e s per°

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RADIO COMMUNICATION October 1990 77 RSGB-MAIL-ORDER PRICE LIST

NON-MEMBERS MEMBERS NON-MEMBERS MEMBERS

ANTENNA BOOKS HUMOUR All About Vertical Antennas (RPI) £7.82 £6.64 R F Byrnes Unpublished Masterpieces NEW (RSGB) £4.09 £3.48 Antenna Compendium Volume 1 (ARRL) £10.93 £9.29 Antenna Compendium Volume 2 (ARAL) £10.93 £9.29 Antenna Book (ARRL) £13.88 £11.80 Antenna Notebook, WI F8 (ARRL) £7.99 £6.79 LICENCE EXAMINATION BOOKS Beam Antenna Handbook (RPI) £8.70 £7.40 Advanced Class Licence Manual (ARAL) £6.56 £5.58 All About Cubical Quad Antennas (RPI) £7.17 £6.09 Extra Class Licence Manual (ARRL) £6.56 £5.58 HF Antennas for All Locations (RSGB) £7.91 £6.72 FCC Rule Book, (ARRL) £7.63 £6.49 Novice Antenna Notebook (ARRL) £7.63 £6.49 How to Pass the RAE (RSGB) £7.19 £6.11 Practical Wire Antennas (RSGB) £8.26 £7.02 Radio Amateurs Examination Manual (RSGB) £7.19 £6.11 Radio Amateur's Antenna Handbook (RPI) £8.17 £6.94 Technicial/Gen. Class Lic. Man. (ARRL) £6,56 £5.58 Simple Low Cost Wire Antennas (RPI) £8.70 £7.40 Transmission Une Transformers (ARRL) £13.92 £11.83 Vagi Antenna Design (ARRL) £11.88 £10.10 LOG BOOKS AND LOG SHEETS Log Book - Transmitting (RSGB) £2.82 £2.40 Log Book - Mobile (RSGB) £1.53 £1.30 AWARDS BOOKS Log Book - Receiving (RSGB) £3.02 £2.57 Amateur Radio Awards Book (3rd Ed) (RSGB) £10.32 £8.77 Log Sheets - HF Contest (100 sheets) (RSGB) £4.04 £3.43 Log Sheets- VHF Contest (100 sheets) (RSGB) £4.04 £3.43

BEGINNERS AND NOVICES DIY Radio (pilot Issue) (RSGB) £2.23 £1.90 DIY Radio (2nd pilot issue) (RSGB) £2.23 £1.90 MORSE CODE BOOKS AND PRODUCTS First Steps in Radio (ARRL) £6.17 £5.24 CW into Foreign Languages (CWP) £6.01 £5.11 Novice Licence Proposal by the RSGB (RSGB) £7.17 £6.09 Morse instruction tape, 5 - 10wpm (2 cassettes) (ARAL) £10.68 £9.08 Novice Instructor's Manual (RSGB) £7.30 £6.21 Morse instruction tape, 10 - 15wpm (2 cassettes) (ARAL) £10.68 £9.08 Tune in the World with Ham Radio (ARRL) £9.69 £8.24 Morse instruction tape, 15 • 22wpm (2 cassettes) (ARAL) £10.68 £9.08 Morse Code the Essential Language (ARRL) £6.17 £5.24 Morse Code lor Radio Amateurs (RSGB) £3.38 £2.87 Morse instruction cassette to 5wpm (ARAL) £5.21 *£4.43 CALL BOOKS Callbook - RSGB 1990 (RSGB) £10.12 £8.60 Callbook - International Listings 1990 (ARRL) £19.58 £16.64 Callbook • N.American Listings 1990 (ARRL) £19.58 £16.64 NOVICE KITS Novice Kit - Audio Amplifier £11.59 £9.85

CLOTHING (MEMBERS ONLY) MAPS/CHARTS/LISTS/ATLASES RSGB Tee Shirt Large £5.29 List - Countries/Awards (RSGB) £1.35 £1.15 RSGB Tee Shirt - Medium £5.29 Great Circle DX Map (card for desk) (RSGB) £1.35 £1.15 RSGB Tee Shirt - Extra Large £5.29 Great Circle DX Map (wall) (RSGB) £3.38 £2.87 RSGB Tie - Blue £4.64 Locator Map of Europe (card for desk) (RSGB) £1.37 £1.16 RSGB Tie - Coffee £4.64 Locator Map of Europe (wall) (RSGB) £2.55 £2.17 RSGB Tie - Green £4.50 Locator Map of Western Europe (wall) (RSGB) £2.09 £1.78 RSGB Tie Maroon £4.50 Maidenhead Locator World Atlas (ARAL) £4.70 £4.00 World Prefix Map in full colour (wail) (RSGB) £3.55 £3.02 Radio Amateur Map of North America (ARCI) £3.59 £3.05 List - Beacon - Region 1 (RSGB) £1.37 £1.16 EMC BOOKS (BREAKTHROUGH) List - Beacon - UK (RSGB) £t37 £1.16 Interference Handbook (RPI) £8.52 £7.24 List • Repeater - UK (RSGB) £1.37 £1.16 Radio Frequency Interference (ARRL) £3.76 £3.20 World Atlas irtAt^.1) £4.84 £4.11

EMC FILTERS MICROWAVE BOOKS Ferrite Ring Toroid (pack of 2) £3.31 £2.81 Microwave Handbook Vol.1 (RSGB) £23.29 £19.80 Filter 1 - Braid Breaker £8.93 £7.59 Filler 2 - High Pass for FM Broadcast Band 2 £8.93 £7.59 Filter 3 - High Pass for UHF TV £8,93 £7.59 Filter 4 - Notch Tuned to 145MHz £10.11 £8.59 MICROWAVE COMPONENTS SERVICE Fitter 5 - Notch Tuned to 435MHz £10.11 £8.59 Semiconductor MD4901 for JVL Mixer £10.99 £9.34 Filter 6 - Notch Tuned to 50MHz £10.11 £8.59 Semiconductor DC1501E for JVL Mixer £14.56 12.38 Filter 7 - Notch Tuned to 70MHz £10.11 £8.59 PCB - UHF Source (RC 10/1981) £7.23 £6.15 Filter 8 - Six Section for UHF TV £20.76 £17.65 Regulator PCB (RC 10/1981) £2.68 £2.28 Filter 10 - Notch Tuned to 28MHz £10,11 £8.59 Doppler Module - 24GHz - GDHM32 £74.23 £63.10 Filter 15 - Notch Tuned to 21MHz £10.11 £8.59 Waveguide - Copper WG20 (price/fool) £7.31 £6.21 Filter 20 - Notch Tuned to 14MHz £10.11 £8.59 Capacitor • Coffin 1000PF (10/pack) £1.25 £1.06 RSGB Filler Kit £51.17 £43.49 Termination - CBT40/40W/50 OHM £22.46 £19.09 Prescater UP6581C 2.6GHz divide by 2 £8.19 £6.96 Prescaler UPB582C 2.6GHz divide by 4 £8.19 £6.96 PCB Cuclad 233 0.005" 2 x 1 inch block £1.16 £0.99 GENERAL - TECHNICAL BOOKS PCB • 1152MHz Source (RC 0287) £4.04 £3.43 ARRL Handbook 1990 (ARRL) £16.58 £14.09 Trimmer - TZ03Z2R3ER110 (PEDOKA) £1.16 £0.99 Buyers Guide to Amateur Radio (RSGB) £7.38 £6.27 PCB Culad 233 0.03r 2 x 1 inch block £1.63 £1.39 Hints and Kinks for the Radio Amateur (ARRL) £5.75 £4.88 Amplifier Board • G4DDK - 1152MHz £4.28 £3.64 Radio Communication Handbook Vols.1+2 (PB) £13.99 £11.89 PCB G4ODK 004 £7.23 £6.15 Solid State Design for the Radio Amateur (ARRL) £10.70 £9.10 Amplifier - Broadband MSA0504 £6.64 £5.64 25 Fun to Build Projects for Learning Electronics (TAB) £7.99 £6.79 PCB - G3W0G/001 - 10GHz Source £26.53 £22.55 99 Test Equipment Projects (TAB) £13.05 £11.09 Capacitor ATC100PF (2/pac) - for DDK004 £2.29 £1.95

HISTORY BOOKS OPERATING BOOKS AND AIDS The Bright Sparks of Wireless NEW (RSGB) £10.85 £9.22 ARRL Operating Manual (ARRL) £13.82 £11.75 History of QRP in USA 1924-1960 (MB) £10.05 £8.54 Amateur Radio Operating Manual (3rd Ed) (RSGB) £7.63 £6.49 The Dawn of Amateur Radio (G3FNJ) £12.69 £10.79 Better Short-wave Reception (RPI) £6.04 £5.13 2MT Writtle - The Birth of British Broadcasting £16.41 £13.95 Complete Oser (IDIOM) £8.64 £7.34

continued on next column

Members visiting HO are advised to telephone first to confirm availability of goods (0707) 59015

78 RADIO COMMUNICATION October 1990 RSGB-MAIL-ORDER PRICE LIST

NON MEMBERS MEMBERS NON•MEMBERS MEMBERS

DX Edge (HF propagation aid) I XANTEK) £21 23 £18.05 Radio Communication bound volumes (1987) (RSGB) £24.88 £21.15 Low Band DXing (ARRL) £9.35 £7.95 Radio Communication bound volumes (1988) (RSGB) £24.88 £21.15 Meteor Scatter Data Sheets (RSGB) £2.52 £2.14 Radio Communication bound volumes (1989) (RSGB) £24.88 £21.15 Operating an Amateur Radio Station (ARFIL) £2.82 £2 40 Back Issue RadComs (RSGB) £3.66 £3.11 International FM Guide (B8P) £3.46 £2.94

CAR STICKERS ORP (LO W POWER) BOOKS Car sticker 'Amateur Radio' (2 colours) (RSGB) £1.36 £1.16 G-ORP Club Circuit Handbook (RSGB) £7.29 £6.20 Car sticker 'I Love Amateur Radio' (RSGB) £1.36 £1.16 Joy of ORP (MVVB) £11.52 £9.79 Car sticker 'I'm monitoring .5, are you?' (2 col) (RSGB) £1.36 £1.16 ORP Notebook (ARRL) £6.57 £5 58 Car sticker 'I'm on the air with amateur radio' (4 colours) £1.36 £1.16 RSGB badge car sticker(members only) (RSGB) £1.24

BOOKS ON SPECIAL MODES Amateur Television Handbook (BATC) £2.51 £2.13 LANGUAGE AIDS Am. Packet Rad. Link Layer Prot. (ARRL) £8.09 £6.88 French Cassette Supplement to Conversation Guide £5.93 £5.04 Computer Net. Cont. Papers 1 - 4 (ARRL) £18.27 £15.53 German Cassette Supplement to Conversation Guide £5.93 £5.04 Computer Net, Cont. Papers Vol. 4 (ARRL) £18.28 £15.54 Russian Cassette Supplement to Conversation Guide £5.93 £5.04 Computer Net. Cont. Papers Vol. 5 (ARRL) £8.11 £6.89 Spanish Cassette Supplement to Conversation Guide £5.93 £5.04 Computer Net Cont. Papers Vol. 6 (ARRL) £8.11 £6.89 Radio Amateurs Conversation Guide (OH1BR) (TOY) £5.82 £4.95 Computer Net. Cant Papers Vol. 7 (ARRL) £8.11 £6.89 Computer Net. Cont Papers Vol 8 (ARRL) £8.11 £6.89 RTTY Awards BARTG £3.64 £3.09 RTTY The Easy Way BARTG £3.64 £3.09 MAGAZINE SUBSCRIPTIONS Slow Scan Companion (BATC) £3.64 £3.09 OST Subscription - One year (Airmail) (ARRL) £88.24 £75.00 Teleprinter Handbook (2nd Ed) (RSGB) £2.46 £2.09 OST Subscription One year (surface mail) (ARRL) £34.41 £29.25 TV for Amateurs (BATC) £2.19 £1.86 OST Subscription - Two years (surface mail) (ARRL) £70.73 £60.12 Your Gateway to Packet Radio rARRI £9.46 £8.04 OST Subscription - Three years (surface mail) (ARRL) £103.24 £87.75

(Please wait 90 days before expecting delivery.)

SATELLITE BOOKS Satellites • the lirst 25 years (AMSAT UK) £4.82 £4.10 F012 Operator's Handbook (AMSAT UK) £5.82 £4.95 RSGB NEWSLETTER SUBSCRIPTIONS Guide lo Am Satellite Operating (AMSAT UK) £3.11 £2 64 DX News Sheet (weekly DX news) £28.24 £24.00 OSCAR 13 Operators Handbook (AMSAT-UK) £6.23 £5.30 Connect International (packet radio monthly) £11.05 £9.39 Satellite Anthology (ARRL) £5.91 £5.02 Microwave Newsletter (10 issues per year) £9.40 £7.99 Satellite Experimenters' Handbook (ARRL) £860 £7.31 Raynet News (6 issues per year) £7.02 £5.96 6 Metre and Up DXer (monthly) £11.05 £9.39

Rates for non-EEC and all other overseas subscribers are available on request from SHORT WAVE LISTENER BOOKS the Membership Services department. Complete SW Listener's Handbook TAB) £15.41 £13.10 Introduction to Weather Satellite Reception (RSGB) £3.11 £2.64 Passport to World Band Radio 1989 (RDII £11.88 £10.10 RSGB MEMBERS SUNDRIES (MEMBERS ONLY) Badge - Callsig n - Standard £3.10 SOFTWARE PRODUCTS Badge - Callsig n - Deluxe £3.49 DX Edge Software for tho PC p(ANTEKI £20.18 £17.15 Radio Communication Easibinder (NEW) £5.99 £5.09 Software Register (RSGB) £1.35 £1.15 Radio Communication Easibinder (OLD) £5.99 £5.09 Badge - Lapel - Mini £0.99 Members' headed notepaper (50 sheets) octavo £1.50 Members' headed notepaper (50 sheets) quarto £2.96 VHF/UHF BOOKS Badge - Lapel - Standard £1.45 VHF/UHF Manual (4th Ed) (RSGB) £11.93 £10.14 All About VHF Amateur Radio IAPI) £10.34 Efs 79

RAYNET SUPPLIES BACK ISSUES OF RADCOM Raynet Badge Clip £0.68 £0.58 Radio Communication bound volumes (1977) (RSGB) £22.88 £19.45 Raynet Car Sticker. Circular £0.82 £0.70 Radio Communication bound volumes (1979) (RSGB) £22.88 £19.45 Raynet Car Sticker - Diamond £0.73 £0.62 Radio Communication bound volumes (1981) (RSGB) £24.88 £21.15 Raynet Badge - Embroidered £1.21 £1.03 Radio Com munication bound volumes (1982) (RSGB) £24.88 £21.15 Rayne Manual. 1986 Edition £3.58 £3.04 Radio Com munication bound volumes (1983) (RSGB) £24.88 £21.15 Raynet Badge - Lapel £1.06 £0.90 Radio Com munication bound volumes (1984) (RSGB) £24.88 £21.15 Raynet Newsletter £5.82 £4.95 Radio Com munication bound volumes (1985) (RSGB) £24.88 £21.15 Raynet Poster £1.15 £0.98 Radio Communication bound volumes (1986) IRSGB1 £24.88 £21.15 Raynet Tie £6.02 £5.12

HOW TO ORDER NON-MEMBERS Use left hand price columns Note that members' sundries are only DELIVERY. Goods will be despatched to UK destinations by 2nd class letter post or parcel available to members of RSGB post. or surface mail to overseas destinations. Please contact FISG13 Headquarters tor 1st class letter post or airmail rates We normally despatch goods within 60 hours alter receipt MEMBERS Use nght hand price columns. II is essential that you quote your callsign or 01 an order, but as delays can sometimes occur please allow 28 days before enquiring RS number so that you can be recognised as a member. about non-delivery of goods.

PRICES. These include postage, packing, and VAT (where applicable) and are subject to change without notice ORDER FROM: AVAILABILITY. Goods are available less postage and packing from RSGB Headquarters RSGB SALES (CWO) between 9.15am and 5 15pm Monday to Friday However you are advised to confirm availability of goods by telephone before visiting Headquarters. We attempt to keep ample Lambda House, Cranborne Road, stocks ol all our sales items, however as this list has to be prepared several weeks in advance we cannot guarantee that any item on this price list is immediately available. Potters Bar, Herts, EN6 3JE PAYMENT. Payment may be made by post enclosing a cheque or postal order. These should be crossed and made payable to 'Radio Society ot Great Britain', ti sending cash please use registered post. You may use your credit card lor payment by post or by telephone. We accept RSGB Credit Card, Visa, Access (Mastercharge1. American -121d4t,ate2nq, Express. and Diners Club cards. Our telephone number tor orders is (07071 49855 (24hrs). gA, Our Giro account number is 533 5256.

RADIO COMMUNICATION October 1990 79 CLASSIFIED RSGB AMATEUR RADIO INSURANCE SCHEME "ALL RISKS" INSURANCE for portable/mobile/base station amateur radio ADVERTISE MENTS and ancillary equipment. A service for RSGB members only. Also public liability and equipment insurance for affiliated clubs and societies. Details and Classified advertisements 50p per word (VAT Included) minimum £7.00. leaflets from Sarah Baylis or Jennifer Lawson. Amateur Radio Insurance Services Ltd. 4a Russell Hill Road. Purley, Surrey CR2 2LA. Tel' 081-660 0820 Please write clearly. No responsibility accepted for errors. Latest dale for or Fax: 081 660 9222. acceptance - 5 weeks before 1st of issue month. Cheques should be made payable to RSGB. All classified advertisements MUST be prepaid. COMPUTER SOFTWARE HARDWARE Copy and remittance to:- Victor Brand Associates Ltd, 'West Barn', Low Com mon, Bunwell, Norwich, Norfolk, NR 16 1SY. PC COMPATIBLE SOFTWARE. Large SAE to Charles Crane G4YFN, 2 NB. Members' Ads must be sent to "Members Ads," RSGB Ng. Pimento Drive, Earley RG6 2GZ. G4U XD's CELEBRATED MORSE TUTOR: BBC's, IBM-PC. compatibles. Adjustable speed, delay, letter frequency, 100 tests, attach your key, ++4+41 £8.50 disc. SAE details/free trial! D. Brandon, 1 Woodlands Road, Chester CH4 FOR SALE 8LB.

AMIDON/MICRO METALS TOR OIDAL CORES, Ferrite, Beads, Rods etc. G3WHO AMTOR/RTTY/C W MK II BBC B/Master. Full feature, split screen, memories, mailbox, selcall, etc. Eprom £27. P. J. Harris. 10 Appleby Close. Send 50p for catalogue. Ferromagnetics, P.O. Box 577, Mold, Clwyd, N.Wales CI-17 1AH. Great Aine, Alcester, Warwickshire 849 6HJ, Tel. 0789 488377. IBM PC CLONES SOFT WARE by G4BMK. See Grosvenor Software display OSLS 1000 £21 (SWLS, Logs, Colour cards, Stamps, Patches. - S.A.S.E. for advertisement in this issue. samples). Currie, 87 Derwent St. Consett, DH8 8LT. RADBASE-2.1 IBM-PC/CO MPATIBLE AMATEUR/S WL LOG/DATABASE. "RAYNE r YELLO W REFLECTIVE TABARDS with "Raynet" like Police, Prefix Country/Continent/Zones/Localtime DataBase. Multi-option LOG/ Ambulance. Medium £9.50, Large £10.00, XLarge £10.50. "Raynet Controller" OSO -checker. search/sort/prints on Date/s. Freq, Modes, Call/s, OSL- 50p extra. ''Raynet Control" road sign 900m m x 60Ornm tripod mounted checker, Name/OTH, Locator/s, Remark/s. Available 360k-1.44m discs £20 + £49.50. Nonreversible battery connectors (10 pairs/pack) £4.50. Mike Watson Call SWL R. Wilmot, 1 Retreat Cottages, Church Lane, Broadbridge Heath. G8CPH, Ipswich (0473) 831448 Horsham RH12 3ND (0293) 69835. THE G4TYF LOG, date, band, power, mode, time, callsign. name, 0TH, RX/ MOSLEY ANTENNAE - All the famous British Manufactured Antennae, TX/RPRT. Search OSL/Log, print out labels, nice screen, four inputs. Disk direct from us including spares/replacements. Mustang, Elan. TA-33Jnr etc. 2000 entries, tree resistor decoder. BBC. Com modore 64, £20. Enclose Full Details shown in our Handbook, price £1.25 refunded upon purchase of callsign. E. Aston, 64 Gurney Valley, Bishop Auckland. DL14 8RW. 0388- Antennae. Mosley Electronics, 196 Norwich Road, New Costessey. Norwich 607500. NR5 OEX (Administrative address only).

ANTI-71/1 MULTIBAND AERIALS, TRAP DI-POLES, F7FE. Aerials, Traps, Baluns. etc. Data 30p SAE. Aerial Guide £1. G2DYM, Uplowman, Devon EX16 HOLIDAY ACCOMMODATION 7PH. (03986) 215. FLYING FRO M GAT WICK? Stay at Mill Lodge Guest House. 4 minutes from SAVE MONEY - MAKE IT YOURSELF! DIY projects - Loops, ATVs, Field airport. Transport available. Telephone (0293) 771170. Strength Meter. SAE G2VF OTHR. GULF COAST, TAMPA, FLORIDA. Luxury bungalow, sleeps 6-8, close to all QSL CARDS. Clear plastic hanging display wallets hold 20 cards. Pack of Florida's attractions. £250 per week Phone Bob GOGHT on 040-928-475 for three £3.20. Viola Plastics, 36 Croft Road, Hastings. Sussex. further details. ELEVATED SITE, use of shack. B&B. Caravan, Bunk House. Camping. Open G4MH MINI BEAM at £110 - £10 carr. SAE details. Supplies of Kenwood. all year. "Tynrhos", Mynytho, Pwllheli LL53 7PS. (0758) 740712. Yaesu etc. Selection of used equipment. The Amateur Radio Shop, 4 Cross Church Street, Huddersfield, West Yorkshire (0484) 420774. CORN WALL. FAR MH OUSE ACCOM MODATION. B&B, E.M. six berth caravan. Set in a secluded location near Truro. Tel John (G4LJY) 0872 86.3849. QSL CARDS - 1,000 FRO M £17.00. Pictorial/Personal designs, single or multi-coloured, raised or flat print. For samples - send L.S.A.E. to Contact Cards, R289. Church Street, Blackpool, FY1 3PE. Tel: 0253 752211. MISCELLANEOUS

G4TJB QSL CARDS. OSL CARDS printed to your specification including COURSE FOR CITY & GUILDS, radio amateurs examination. Pass this photocards and cartoons. ANTENNAS (whips to beams). SCANNERS, important examination and obtain your licence, with an RRC home study TRANSCEIVERS, PO WER SUPPLIES. LINEARS, PREA MPS, CABLE, CON- course. For details of this and other courses (GCSE, career and professional NECTORS. We can supply almost anything (phone and ask) Part exchange examinations, etc) write or phone - THE RAPID RESULTS COLLEGE, Dept welcome. For samples and product list S.A.E. to 24 Portishead Road, Worle, JT100, Tuition House, London SW194DS. Tel: 081-947 7272 (9am-5pm) or use Weston-Super-Mare. BS22 OUX. 0934 512757. our 24hr Recordacal I service 081-946 1102 quoting JT100. OSL CARDS. Gloss or tinted cards. SAE for samples to Twrog Press, HO ME VIDEO CAMERAMEN - Send your friends overseas a videotape. We Penybont. Gellilydan. Blaenau, Ffestiniog, Gwynedd LL41 4P. convert your videotapes between NTSC/PAL/SECA M. Details from GM8NVG, STABLE RECORDINGS. Lochend, BEITH, Ayrshire, KA15 2LN. 0505 85488. MAKE YOUR OSL a collector's item with GW3C0I's personalised sketch £10. Pen rhynbach, Abersoch 2675. VOLUNTARY TECHNICIANS needed to service and develop Royal Marsden Hospital's London and Sutton radio studios. Call James, 081-660 5932 QSL CARDS PRINTED at competitive prices. SAE for samples. Capstan Press, (evenings). 62 Newark Lane, Ripley, Woking. GU23 6BZ. HELLO TREASURE-HUNTERS, are you interested to meet weekly on 20m, so POLYPROPYLENE ROPE BARGAINS - 220 metre coils! 4mm -£12. 6mm - please write to: DL1NDL - Henry Grünbeck, Am Rucken 9,8642 Ludwigsstadt £17. 8mm - £25. Please add £3 p&p. - Cheques 'Rope-Link.' Cadence. Battle 2. West Germany. Road, Heathfield, Sussex TN21 9DR.

ALUMINIUM TUBE. Heavy-duly (scaffold) tube approx. dimensions 20' long. 2" dia, ' (4.5m m) wall thickness. 20' and 10' lengths available @ £1.80 + HOLIDAYo m RARE DX ISLAND VAT per ft. C.W.O. Rusper Hire (Crawley) 0293 87 1621 office hours only. "lilt Is good enough toe the Square bathers, It must be good enough lof your (See March RaciCom) SAMSON EL-KEYERS and twin-paddle keys. Send for details of these top Work tho pile-ups from the comfort of our Holiday Guest House situated on GOZO quality models costing from £36. - G5BM OTHR (0531-820960). (JM76AE1). Included in the price is use of Fully Equipped Shack. All travel and accommodation arranged. All paperwork included for your 91-1 Call Sign For. VALVE PRICES UP Oct'90. 6JS6C N.E.C. for Ft101E/B £45 pair - 6KD6 green further details please phone or write to7 banded F T401 £45 pair - 12BY7A N.E.C. £26 each - 12BY7A U.S.A. £11 each T. Menzies, GM/9H5LY - 6146B U.S.A. £38 pair (3 for £56) - (some batches USA 61468 OK Yaesu, 31 Pentlaixf Terrace, Edinburgh, Scotland, ENID 6410. Tel: 031-447 3219 some poor WE test in a rig) - C.W. fillers FT101ZD. 707. 902, 102. 107 £39 - D.B.M. & W.A.R.C. kits FT101B/E £21 each - Black Star 600MHz super frequency counters £155 - Yaesu & ICO M new, S.H. Com_ sales etc. G3LLL, Holdings Amateur Electronics, 45 Johnston Street. Blackburn 882 1EF. (0254) 59595 (5 miles Junc. 31 M6). Closed Thurs)•

AERIAL WIRES, strong PVC coated £6.50. hard drawn 14swg £14, 16swg NOTICE TO OUR READERS £11.50, all per 50 metres post/VAT paid, 30p stamps for full lists of cables, etc Although the staff of Radio Com munication take reasonable precautions to - W. H. Westlake, Clawton, Holsworthy, Devon. protect the interests of readers by ensuring as far as practicable that SIX METRE ANTENNA TUNING UNITS 2m and 4m versions available. £39.75 advertisements in our pages arc bona fide, the magazine and its publisher, inclusive. Empcom. 7 Robinia Close. Waterlooville P07 8HF. The Radio Society of Great Britain. cannot give any undertakings in respect of claims made by advertisers, whether these advertisements are printed as FT10113 50 MHz valve 20 Wall transverter, uses some Pye Vanguard parts. Project cost around £20. Complete plans in A4 booklet. £5 pp. G4EDD. 18 part of the magazine, or are in the form of inserts. Spencer Street, Stanley Com mon, Derbys. DE7 6GA. 0602-327686. While the publishers will give whatever assistance they can to readers having HEATHKIT linear amplifier. model SB 200, Heathint monitor scope model HO- complaints, under no circumstances will the magazine accept liability for 10. Otters please. Phone 0799 23558. non-receipt of goods ordered, or for late delivery, or for faults in manufacture. Legal remedies are available in respect of some of these QSL CARDS? Send sae to Brian Hatley, 28 Payne Avenue, Hove. E. Sussex circumstances, and readers who have complaints should address them to the EIN3 5HD. (I'm back!). advertiser or should consult a local Tradings Standards Office, or a Citizen's S.S.B. PRODUCTS, CORN WALL. 25 shortwave receivers; testgear: thousands Advice Bureau, or their own solicitor. manuals; quartz crystals; aerials; tuners; scanners; CB; marine radiotelephones. Readers arc also reminded that the use of radio transmission equipment is Sae list. 42 Halvarras Road, Playing Place, near Truro. (0872) 862291. subject to licencing and the erection of external aerials may be subject to local CALLSIGN BASEBALL CAPS - Blue. Red or Black. send £3.90 including authority planning regulations. p&p. M. J. Hilton, 3 Hight ields, Wirral, L60 7TF.

80 RADIO CO M MUNICATIO N October 1990 ADVERTISERS INDEX RF DESIGN ENGINEER NB. Roman numerals have been used for the (Salary Negotiable) pages of this month's pull-out supplement.

Scant ionic Ltd, is a leading Manufacturer of Wired and Aerial Techniques 60 Lake Electronics XIV Radio Based Security and Fire Detection Systems. AJH Electronics 60 Lee Electronics II(IFC) Amateur Radio Comms. Ltd 43 Lion Systems Ltd 45 Scant ronic Radio Systems, based at Mitcheldean, Glou- Amcomm Services Ltd 23 London Amateur Radio cestershire, design and manufacture low power, VHF and 36 Show 77 UHF radio telemetry products used within the security AMDAT industry. AMS4 and Radio Rally 68 Lowe Electronics Ltd Anchor Surplus Ltd 76 12, 13 & IFC We are currently seeking an RF DESIGN ENGINEER to Argus Books 77 Marco Trading 36 work in a team developing new products, both to expand ARE Communications Ltd Martin Lynch G4HKS 42 our existing range of "wireless" security systems and to XII, 58 & 59 break into other market areas for radio telemetry. T. Menzies GM/9H3LY 80 Arrow Radio Ltd 34 & 35 Nevada Communications XII Candidates with at least two years RF design experience, Badger Boards 44 Photo Acoustics Ltd 67 preferably in a related industry, should be innovative and B. Bamber Electronics 60 Procomm (UK) 66 self motivated and able to take a project from initial J. Birkett 76 specification through to volume manufacture. PW Publications 68 Bredhurst Electronics Ltd 67 Ouarlslab Marketing Ltd 45 If you feel that your background fits these requirements. CAP.00 Electronics Ltd 37 Radio Bygones 68 applications in writing (enclosing a CV) — should he sent "Characteristics" for Radio Shack Ltd XIV to:- Amateur Radio 61 Raedek Electronics Co 66 Cirkit Distribution Ltd 82 & IBC David Hoare, Engineering Manager, Seantronic Limited, Randam Electronics 66 Datong Electronics Ltd 36 Scan House, Xerox Business Park, MITCHELDEAN, Raycom Communications Dee Comm Amateur Radio Glos. GL17 OSN. Systems Ltd 50 & 51 Products XIII Telephone: (0594) 543343. R&D Electronics 37 Dressler Communications Ltd R.N. Electronics 44 45 Scantronic Ltd 81 Eastern Communications S.E.M. XIII IV & V Sharwood Services 68 ERA Ltd 43 Siskin Electronics Ltd ...... XIV Ferromagnetics 60 Skilltotal Ltd. 61 FieldTech Personnel 81 South Midlands Communications G4TJB QSL Cards 60 WANTED" Ltd. 14, 15, 16 & OBC G4TNY Amateur Radio 44 Spectrum Communications 66 G4ZPY Paddle Keys XIV (Preferably Livell) S.R.W. Communications Ltd. 67 Garibaldi Technical Recruitment Stephens-James Ltd 42 76 Strumech Versatower Ltd XV Grosvenor Software 66 Syon Trading 44 RADIO G.W.M. Radio Ltd 76 Tandy 33 Hately Antenna Technology 76 T.A.R. Communications 69 COMMUNICATION Heatherlite Products 44 Jim Taylor G4ERU 68 Hornsea Rally 68 Technical Software XV ENGINEERS ICOM (UK) Ltd Tennamast Scotland 61 with any experience in the following fields: 26, 27 & XX(OBC) T.V. Masters 67 ICS Electronics Ltd R.F. Design & Development, 53, 54, 55 8 XIX(IBC) Uppington Tele-Radio 60 R.F. Propagation, Microwave, Jandek 67 Waters & Stanton 24 & 25 Project Engineers, Senior R.A. Kent (Engineers) 69 Western Electrical Dist. Ltd 61 R.F. Engineers, Test & Klingenfuss Publications 76 Colin Wilson 68 Repair Engineers (especially those with KW Communications Ltd 40 Wood & Douglas 69 exp in Cellular, Paging, PMR equipment & military communication) NEXT COPY DATE DOZENS OF VACAN CIES NATION WIDE!!! The display advertising copy date for If radio is your profession, or your hobby our December Christmas issue will be (eg Ham Radio) CALL US!!! 16th October 081-991 9895 — FieldTech Personnel New advertisers should contact Mon-Fri 9am-7p m, Sat 10am-4p m Victor Brand, G3J NB on 0953 89 8473 No 2 Argyle Road, West Ealing, London W13 8AD for assistance and information

RADIO COMMUNICATION October 1990 81 TM5315B TM5365

• Frequency • 30 ranges • Remarkable value L_A_ CI measurement to • Frequency and 20MHz • s, . • . • 18 ranges capacitance • ac/dc current to measurement • 10A dc current 10A • Compact size • 24 ranges gt .e_ en, c) dc volts: 200mV-1kV ir=imrcruor dc volts: 200mV-1kV dc Volts: 200mV-1kV ac volts: 200mV-750V ac Volts: 200V. 750V ac volts: 200mV-750V dc current: 200uA-10A dc current: 200uA-10A dc current: 200uA-10A ac current: 200uA-10A Resistance: 20011-20Mfl ac current: 200uA-10A Resistance: 20011-2000MÍ1 Continuity and diode test Resistance: 20011-20Mil Frequency: 2kHz-200kHz Basic dc accuracy. 1.-- 0.8% Frequency: 2kHz-20MHz Capacitance: 2nF-20uF Size: 128x 72 x33mm Continuity, diode and HFE test Basic dc accuracy :4:0.5% Logic. continuity, diode and HFE test

1 + 5+ 10+ 1 + 5+ 10+ £17.38 £16.95 £16.52 £31.96 £31.16 £30.39 £32.96 £32.13 £31.33 56-05315 ex VAT 56-05375 ex VAT 56-05365 ex VAT 411Z21111MI

• 0.5% accuracy • Temperature • Frequency .oadi measurement measurement to • Transistor HFE - coal 10MHz test • Capacitance measurement • Capacitance • 26 ranges measurement • 40 ranges from 1pF to 20uF • 39 ranges dc volts: 200mV-1kV - • - O 0 dc volts: 200mV-1kV V 01 0 ac volts: 200mV-750V ac volts: 200mV-750V Ç. dc volts: 200mV- I kV dc current: 200uA-10A geem mazoni • iZI: Z =3 dc current: 200uA-10A ac volts: 200mV-750V ac current: 200uA-10A ac current: 200mA-10A dc current: 200uA-10A Resistance: 200n-2000Mf! Resistance: 200(1-2000Mil Resistance: 20011-2000Mfl Temperature: 200'. 750C Capacitance: 2nF-20uF Continuity, diode and HFE test Capacitance: 2nF-20uF Frequency: 2kHz-10M Hz Basic dc accuracy ± 0.5% Diode. HFE and continuity test • Continuity. diode. HFE, logic and LED test. 1+ 5+ 10+ 1+ 5 + 10 + 1+ 5 + 10+ £29.28 £28.49 £27.77 £39.96 £38.96 £37.98 £49.99 £48.75 £47.52 56-00115 ex VAT 56-00135 ex VAT 56-00175 ex VAT

TO ORDER: Phone for same day despatch (0992) 444111 or use the order form below. Postage and packing is £1.00 per order. Please despatch the following:

X TM531513 at £20.99 (£17.38 + £2.61 VAT +£1.00 p&p x TM115 at £34.67 (£29.28 + £4.39 VAT + £1.00 p&p)

X TM5375 at £37.75 (£31.96 + £4.79 VAT + £1.00 P&p) X TM135 at £A6.95 (£39.96 + £5.99 VAT + £1.00 p&p)

X TM5365 at £38.90 (£.32.96 + £4.94 VAT + £1.00 p&p) X TM175 at £58.99 (£49.99 + £7.50 VAT + £1.00 p&p)

Name: RC2 Address. Post Code: Cheque Postal Order n (-- Access or Visa Cirkit Expiry Date• Cirkit Distribution Ltd, Signature: Date: Pork Lane, Broxbourne, Heris ENI 0 7NQ \.

82 RADIO COMMUNICATION October 1990 The Leicester Show Guide 1990

Leicester Amateur Radio and Electronics Exhibition

Granby Halls, Aylestone Road, Leicester Friday 26 and Saturday 27 October 1990

10 am to 6 pm .-10011lemOwa-b-O efflutob

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i i THE LEICESTER SHOW GUIDE RADIOCOMMUNICATION October 1990 Welcome to the 19th Leicester Amateur Radio & Electronics Exhibition

... which has now become the most successful and popular amateur radio show in the Midlands. This will be held at the usual venue, Granby Halls, Aylestone Road, Leicester on Friday 26 and Saturday 27 October next. Times of opening 10am to 6pm (disabled 9.30am). Admission charges are £1, OAP's/children 50p. Block bookings - more than twenty people 10% discount.

• Extensive trade exhibition • Large bring and buy stand • Raffles • Talk in on GB2GH on S22 and SU22.

Guide To Car Parks

HISTORY OF THE SHO W

The show's birth was the culmination of six amateurs getting together to run a show for the benefit of local amateurs in their area. Three of the amateurs were members of the Leicester Repeater Group and three are members of the RSGB. One member of the original six resigned leaving the remaining five to carry on the organisation of the show as an annual event, thus founding the Leicester Amateur Radio Show Committee. Their Chairman is Mr JP Theordorson, G4MTP, Secretary Mr Frank Elliott, G4PDZ, Treasurer Mr GW Dover, G4AFJ, Mr T Wheeler G4NWS and Mr AS Lord, G1YEZ. The proceeds from the show are divided on a pro rata basis among those clubs in the area who send stewards to help run WHERE TO STAY the event, depending upon how much help they actually give.

If you are thinking of staying overnight during the show, arrangements have been made for special block bookings at the following hotels:

Grand Hotel, Granby Street, at a cost of £30 per person per night. Their telephone number is 0533 555599.

Alexandra Hotel, London Road, at £28 (single) and £40 (double or twin) inc English breakfast. Telephone 0533 703056 (G6HSF Andy).

Post House, Braunstone Lane, at £25 (single) and £19 per person per night for a twin or double room, inc breakfast, VAT etc. Telephone 0533 630500.

Belmont Hotel, De Montfort Street, where a special show price per person has been negotiated for TWO nights: bath, bed, breakfast and dinner £68. Telephone 0533 544773.

Please remember to mention, when booking, that it is part of the Leicester Amateur Radio Show block booking to qualify for these concessionary prices.

RADIO COMMUNICATION October 1990 THE LEICESTER SHOW GUIDE EASTERN COM CAVENDISH HOUSE, HAPPIS

A ft VISA Buy it with Acct-,s 0692-

JAYBEAM - MICRO WAVE MODULES - DAIWA - LOWE - CAP.00 - BNOS - DATONG - AKD - VISIT US ON STAND S22 LEICE

ICOU HE ICON DUAL BAND C•781 HF TRANSCEIVER BUILT IN ATU ,SCOPE & PSU 4500.00 C-24ET 2M/70CM FM HANDPORTABLE INC NICAD CHARGER 385.00 IC-765 HF TRANSCEIVER BUILT IN MU & PSU 2499.00 C-3220E 2M/70CM FM MOBILE 26W NEW 499.00 IC-751A HF TRANSCEIVER 12 VOLT 1500.00 C-2400E 2M/70CM FM MOBILE DUAL WATCH 45W/36W 635.00 1C-735 HF TRANSCEIVER 12 VOLT 979.00 C-2600E 70CM/23CM FM MOBILE 35W/10W 675.00 C•726 HF TRANSCEIVER WITH 6 METRE 12 VOLT 989.00 ICON MULTHIAND C-725 HF TRANSCEIVER 12 VOLT 759.00 C-970E MULTI8A ND ALL MODE TRANSCEIVER 12V 199500 C-901E MULTIBAND FM MOBILE 2M/70CM STD 799.00 ICON 60MHZ IC-UX19 28MHZ UNIT 219.00 C-605 6M TRANSCEIVER S.S8/C W 12 VOLT 529.00 1C-UX69 60MHZ UNIT 249.80 IC-575E 6M/10M TRANSCEIVER SSB/F8A/CW lOW WITH PSU 995 00 C-UX$92 I44MHZ SSB UNIT 379.00 IC-676H 6M/10M TRANSCEIVER SSB/FM/CW ICOW 12 VOLT 1199.00 IC-UX129 1.2GHE UNIT 399.00

ICON 144MHZ IC-2SE 2M FM HA NDPORTABLE WITH NICAD CHARGER 275,00 ICON BEC EIVERS IC-2SET 2M FM HA NDPORTABLE KEYPAD MAI 295.00 C-R9000 100KHZ-23R: RECEIVER CRT DISPLAY 3995.00 IC-20E 2M FM HA NDPORTA BLE WITH NICAD CHARGER 265.00 C-R7000 26-1000+1026-2000MHZ RECEIVER 988.00 IC-228E 2M FM MOBILE 25W 365.00 IC-R100 WIDE BAND RECEIVER 60010Q -1.8G112 499.00 C-22814 2M FM MOBILE 45W 385.00 C-R72E GENERAL GOVERAGE RECEIVER 645 00 IC-290D 2M SSB/FM/CW 25W 559.00 IC-R716 GENERAL COVERAGE RECEIVER 835.00 C-275E 2M TRANSCEIVER SSEI/FM/CW 26W PSU 1069.00 1C-R1 HANDPORTABLE RECEIVER 399.00 C-275H 2M TRANSCEIVER SSB/FM/CW 100W 12 VOLT 1039.00

KOMI 430M HZ IC-4S5 70CM FM HANDPORTABLE WITH NICAD CHARGER 299.00 KENWOOD VHF UHF SASE STATION TRANSCEIVERS 898.00 C-4SET 70CM FM HANDPORTABLE KEYPAD DIMF 299.00 TS-711E 2M MULTIMODE TRANSCEIVER WITH DCS C-4GE 70CM FM HANDPORTABLE WITH NICAD CHARGER 299.00 SP-430 EXTERNAL SPEAKER 40.81 C-448E 70CM FM MOBILE 26W 429.00 VS-1 VOICE SYNTHESIZER 32.26 C-490E 70CM SSB.FM.CW IOW 449.013 IC -475E 70CM TRANSCEIVER SSB.FM,CW 26W PIT PSU 1185.00 TS-790E DUAL BANDAI.. MODE TRANSCEIVER 1296 OPTION 1495.00 I C•476H 70CM TRANSCEIVER SSB.FM.CW 100W 12V 1250.00 PS-3I MATCHING PSU TS790 186.00 IC- SP-31 EXTERNAL SPEAKER IS790 63.46 ICON 1.20Hz UT-10 23CM MODULE 379.51 •12GE 23CM FM HAN DPORTABLE INC NICAD CHARGER 365.00 24ET VS-2 VOICE MODULE 3226 C•120E 23CM FM MOBILE 10W 520.00 KENW 'co YAE FROM STALHAM TAKE THE •WALCOTT.BACTON,HAPPISBURGH ROAD'. AFTER 1 MILE TURN RIGHT SIGNED 'HAPPISBURGH 2, WE ARE .1à. _ . 1 MILE FURTHER FROM CROMER TAKE THE STALHAM ROAD,D0 NOT NEW OFFICES & SHOWROOMS AT HAPPISBURGH TURN TO HAPPISBURGH VILLAGE. TRAVEL ANOTHER I MILE THEN TAKE LEFT SIGNED 'RAPPISBURGH 2' WE ARE 1 MILE FURTHER

iv THE LEICESTER SHO W GUIDE RADIO CO M MUNICATION October 1990 MUNICATIONS BURGH, NORFOLK, NR12 ORU

PARKING

ACCESS 650077 FACILITIES

RSGB - JUPITER - ICS - RSGB - ICOM - KEN WOOD - YAESU - KEYS - ROTATORS - CABLE - PLUGS STER AMATEUR RADIO SHO W

KENWOOD VHF/UHF MOBILE TRA NITCEIY ERS TS-440S HE TRANSCEIVER 160-10M 1138.00 TR•761E 2M MULTIMODE MOBILE/FIXED TRANSCEIVER 699.00 AT-440 INTERNAL AUTOMATIC ATU 144.82 TR-861E 70CM MULTIMODE MOBILE/FIXED TRA NSCEIVER 699.0D P5.50 MAINS PSU WITH COOLING FAN 222.49 VS•1 VOICE MODULE 32.26 VS-1 VOICE SYNTHESIZER MODULE 222.49 TM-231E 2M COMPACT MOBILE TRANSCEIVER 60,10,6W 289.00 1M-431E 70CM COMPACT MOBILE TRANSCEIVER 35,15.6W 318.00 TS-140S HE TRANSCEIVER 160-10M 862.00 TM-631E 23CM COMPACT MOBILE TRANSCEIVER 10,IW 386 00 TS-0805 HF TRANSCEIVER 160-10M WITH 6M 986.00 RC-10 REMOTE HAND SET 169.00 P5-430 MAINS PSU 173.78 RC-20 REM OTE CONTROLLER 165.20 F-20 INTERFACE UNIT 152.43 YAESU HF TRANSCEIVERS PG-4H INTERFACE CONNECTING CABLE 9.38 FT1000 ALL MODE HF TRANSC El/ER DUAL RECEIVE EXTENSION CABLE KIT 30.47 SPS EXTERNAL SPEAKER WITH AUDIO FILTER DRU -1 DIGITAL RECORDING SYSTEM 231,431 86.72 DIGITAL VO/CE STORAGE UNIT 2991096 ° 1M-701E DVS2149 °° COMPACT 2M,70CM MOBILE TRANSCEIVER 26W 469.00DELUXE 144/430MHZ MOBILE TRANSCEIVER 60.36W 665.00 1M-731E BPF1 SUB VFO FILTER UNIT 69.00 YH 71ST HEADPHONES STEREO/M ONO FOR DUAL RECEIVE 34.00 MB-1 I MOBILE BRACKET TM731E 16.54 TC X01 TEMP COMPENSATED OSC UNIT 95.00 SP-50 MOBILE SPEAKER UNIT MOST MODELS 20.41 MD1C8 BASE MICROPHONE 89.00 SP-41 MOBILE SPEAKER UNIT MOST MODELS 18.61 FT7470X HF TRANSCEIVER GENERAL COVERAGE OX 669.00 03C00568 FM UNIT 39.99 KEN WOOD HF D3000669 TXCO OSCILLATOR UNIT 46.00 111-960110 DE LUX HF TRANSCEIVER FROM KEN WOOD WITH DSP 3199.00 MMB38 MOBILE MOUNT 22.00 15-9605 STANDARD VERSION OF 960SD BOTH HAVE BULT IN ATU .. 2499.00 MMEI42A METAL CASES 66,00 DSP-10 DIGITAL SIGNAL PROCESSOR UNIT 399,00 0M1747 OWNERS MANUAL SM-230 MONITOR WITH PAN DISPLAY 773.00 151747 TECHNICAL SUPPLEMENT SP-2 HIGH STABILITY TC X0 99.00 FT7670X HF TRANSCEIVER GENERAL COVERAGE OX 82 6°6° SP-960 EXTERNAL SPEAKER WITH SWITCHED FILTERS 87..55 969 ...00 MMB20 MOBILE MOUNT .. 25.00 VS-2 VOICE SYNTHESIZER MODULE 32.26 FRB757 RELAY CONTROL UNIT 10.60 0MT757 OWNERS MANUAL 2.50 TS-940S HF TRANSCEIVER GENERAL COVERAGE RECEIVE I 995.00 151757 TECHNICAL SUPPLEMENT 8.50 A1•940 AUTOMATIC ATU 244.88 SP•950 EXTERNAL SPEAKER WITH SWITCHED FILTERS 87.66 F17670X TIF TRANSCEIVER WITH VHF OPHONS 1699.00 $O-I RICO UNIT 193.63 FT 60/767 6M MODULE 179.00 144/767 2M MODULE 179.00 VS- I VOICE SYNTHESITER MODULE 32.26 470R 430/767 70CM MODULE 226.00

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RADIO COMMUNICATION October 1990 THE LEICESTER SHOW GUIDE V •Lef New Products Available at the 1990 Leicester Show

We asked exhibitors to let us know what products would be launched or featured at Leicester. Here is what they told us...

Dewsbury Electronics Stand S4 C.M. Howes The new Dewsbury Electronics Com munications 'Supa-Tuta Plus' is a morse tutor Stand E9a with a difference - it bites back. A new transmitting kit is to be This is the trainer for the launched at the show. This is a budding CW expert who is keen power amplifier for the 10 and to upgrade his sending to 15m amateur bands, to match the absolute perfection. Plug in a HTX 10/15m SSB/CW exciter straight key or your high speed introduced at the RSGB's 1990 paddle and send back the lesson Convention. This makes it you have been studying. Behold possible to use C.M.Howes kits - an impartial and instant to build a complete transceiver appraisal of your morse is to get on these two exciting displayed by an error code bands. Prospective Novice indicating 'poor - acceptable - Licence holders are likely to find good'! At £82.45 this has got to this of special interest. The be a good investment for some HP10 can be set up for 3W or of the contest operators we have IOW PEP output so it is just as heard recently. Try the 'Supa- suitable for Class A licensees Tuta Plus' and its companion who want to try their hand at 'Supa-Keya' and 'Supa-Tuna' at home construction. The broad the show. band amplifier is fully filtered and contains the essential Badger Boards Waters and Stanton ICOM UK Stand E2 interfacing circuitry such as Stand S57 Stand S15 ICOM will introduce their delayed P11', receiver muting etc. The HP10 kit will be selling The Badger team are busy It is special offer time at the exciting new 23cm, all mode at Leicester for £29.90. upgrading their kits for the Waters and Stanton Stand. transceiver, the IC1275A/E. Offering coverage from 1240 - show. Complete with all Bargain hunters should look for FLA. Kent (Engineers) accessories and boxes, the new Alineo transceivers on 1300 MHz, IOW of stable and Stand El4a these popular DiY packs show for the first time, the continuous output, this rig has can be completed without Diamond range of antennas, 99 memories with versatile R.A. Kent intend to show, for having to search the junk box power meters and accessories, scanning facilities and full CW the first time, their new morse for those extra items. and the outstandingly succesful break-in. This is sure to be a tutor featuring five letter and See also page 9 for a list Jupiter handheld scanners - all at winner with the satellite figure standard or random of just some of the RadCorn prices you are unlikely to refuse. fraternity. The new ICOM full groups. The tutor will also play projects supported by Badger The full and updated range of colour glossy catalogue is also back random groups for Boards. W&S Frequency Lists will also expected to be published in time checking your copy. You just be ready for avid listeners. for the show. keep going until you get it right!

Lee Electronics Stand S53

The Standard C5608D will be making its debut at the Lee Electronics Stand. This powerful new 50Wtransceiver looks to be one of the most sophisticated dual banders this year. It offers crossband 2m/70cm repeater facilities and a host of mind bending features including the ability to programme all functions from the LCD keypad hand microphone, 20 memories, 2 scan modes, and programmable wide band receive up to 1000MHz. All this for an introductory price of £650.

vi THE LEICESTER SHOW GUIDE RADIO COMMUNICATION October 1990 Lowe Electronics RayCom Stand E12 Com munications Expect something of a fanfare Stand S36 when Lowe unveil the latest Mindful of the approaching technology from Kenwood. Novice Licence, Raycom have Their ultra compact TH-77E revealed that they hope to show dual band transceiver is a an entirely new transceiver for 'handy' with a difference. the beginner and low budget Packed into its tiny case is an operators. It is all top secret as extraordinary number of state of we go to press but our guess is the art features, including that this could be the rig to give selectable full duplex, cross band the big boys a run for their 2m/70cm operation with obvious money. Still in the pioneering applications for Raynet, dual spirit. Racom are planning to band receive, dual display and launch a brand new naine in UXU, the UHF dual watch power supplies and amateur function that allows dual band linears, plus an intriguing frequency simultaneous new IF filter for the RI. reception. A remarkable S.E.M. Stand S55 scanning system appears to Two new products are available type, so long as it is generated Dee Comm Amateur cover everything on both the from S.E.M. this year. The Mk11 within a few miles of your main and sub-band. There is a QRM Eliminator is a completely receiver - a local factory or your Radio Products variety of power options, redesigned version giving a own computer! The HI-Q Aerial Stand S60 independent AF and squelch broader null on the two phasing Matching Unit is produced Dee Comm are launching a new controls and a 42 memory controls making operation of the especially for modem range of antennas at Leicester, capability. .. and that's just for unit much easier than the MM, transceivers which have broad including a five band mobile starters. It all comes and complete wide band hand aerial amplifiers. The helical for 10, 12, 15, 17 and 20 conveniently coverage from 100kHz to Matching Unit has high metres, and a series of new packaged down to ' 60MHz. The Eliminator will selectivity to reject unwanted fibreglass colinears and end fed a miniscule completely phase out any local signals, preventing cross half waves for 2m and 70cm. 58x140x3Ornm. interference, no matter what modulation and overload. Also offered is a large range of This we've got to stainless steel hardware which is see! often difficult to obtain in small quantities.

CapCo Electronics Lake Electronics Stand S6a Stand S31 The latest 'complete to the last white. As with all Lake kits, Leicester will witness a world nut' kit from Lake will be on construction is in an easy to first with the latest ingenious show at Leicester. A neat little build modular form, supported product from the all-British 40m CW transceiver, the DTR7 by a fully illustrated 30 page CapCo. Working in conjunction is an ideal rig for portable, home manual which includes full with Tony Wells, G7IGG, Tony or holiday operators. Covering 7 setting up instructions, including Johnson of CapCo has designed - 7.IMHz with 2W output, the voltages and a trouble-shooting and developed the software to rig features a Colpitts VFO, a guide. provide total computer control of half-wave output filter, The complete DTR7 kit is any and every transceiver that adjustable sidetone and a priced at £84.50. A ready built has integral serial port facilities. sensitive direct conversion and air tested transceiver can be The system automatically receiver with RIT and a 12dB supplied at £135. Further details controls the tuning of an switched attenuator. Power and a catalogue of all Lake associated CapCo magnetic loop required is I 2V. Housed in a 210 products can be obtained from antenna installation. Visitors can x 190 x 85mm black, PVC Lake Electronics, 7 Middleton expect to see an exciting full coated, case, the front and rear Close, Nuthall. Nottingham, demonstration at the show. panels are already printed in NG16 1BX.

Arrow Radio Ltd Stand S33 The new Kenwoods are going to be centre stage on the Arrow stand. The limelight is being shared with what Arrow describe as the "Highest gain dual band base antenna in the world". From Comet this 7.9m long aerial. the GPX2010, offers 9.5dB gain on 2m and I 3.2dB on 70cm for £142.95.

— RADIO COMMUNICATION October 1990 M O M . THE LEICESTER SHOW GUIDE vii ARE Co m munications Stand S41 Completely new to the UK will be the Tokyo Hi-Power dual band 50W linear. Model HL- 726D. The importers, ARE Communications, anticipate that. ai £295, this versatile 144MHz • and 430MHz amplifier will be much in demand among those using dual band rigs and antennas.

Grosvenor Software A mateur Radio Technical Software Stand S62 Co m munications Ltd Stand El4b The G4BMK multi-mode Stand Si 0 "Amazing" is how TS's software program for RTIY/ An interesting update of the Richard Wilmot describes their AMTOR/CW and FAX/SSTV Amiga Computer HF Log Mk11 FAX and weather satellite will be displayed in their latest will be on demo at the ARC decoding software for the versions at the Grosvenor stand, with just the possibility Spectrum computer. Using a Software stand. that a 113M PC compatible standard Epson compatible dot version will also be ready for the matrix printer, full resolution show. ARC will be displaying charts, press photos and weather A MDAT Stand E15 Standard's new C5608D 50W satellite can be printed out from AMDAT is now able to supply dual bander and, in association any 48 or I28k Spectrum giving the ideal item for every shack. with SMC. will be offering excellent grey shading, giving The Junghans Rugby Clock F1'747GX transceivers at an near photographic results. All of provides an extremely accurate attractive £549. the standard FAX settings are time display because it is locked supported as well as inverted to the Rugby timecode scanning, essential for press transmission. This makes it an photos. This looks like a really invaluable addition to their inexpensive way to equip satellite tracking systems. They yourself forthese interesting G4ZPY Paddle Keys will be available at the show at a modes. special discount price. AMDAT An all brass (including the base) also hopes to launch a major twin paddle key will be on new product complimemting display together with the other their packet radio and satellite 28 types of key in the G4ZPY products. range.

South Midlands Co m munications Stand S8 Following the announcement in will be approximately 5ft long, FT650 announced recently have Radio Communication that come complete with a heavy now arrived from Yaesu and will permission should soon be duty spring and claw mount, and be on sale. This 100W forthcoming to operate mobile a coax cable already fitted. multimode covers 10, 12 and on 6m (Sept 90, p6), SMC are Capable of handling in excess of 6m, with the receiver covering preparing 6m mobile whips for 100W, this new antenna will 24 to 56MHz. The basic price their exhibit. The OSCAR 6m retail at £24.90. Stocks of the has now been set at £995.

Tenna mast (Scotland) Stand El5a Rose, GMONHH, and Norrie, GM4VHZ, will be on the stand to discuss customers' requirements and to meet friends, old and new. They are continually improving their masts, and extending the range available, and can now offer a range of slim-line masts up to 40ft, which can satisify the majority of requirements. Fixed lattice masts at affordable prices have recently been added to the range.

viii THE LEICESTER SHOW GUIDE RADIO COMMUNICATION October 1990 I Siskin Electronics Stand S44. Nevada Siskin Electronics will be taking multimodes, Siskin will also be Com munications packet radio a stage further by offering the exciting PacComm Stand S42 demonstrating a variety of DSP based PSK-I satellite Nevada will feature the WB I, an satellite tracking systems which modem which caters for OSCAR improved and extended version will work with most popular 16 18, 19, and FO-20 plus of the popular Fairmate HP100E. home computers (in other words reception of telemetry from The set has 1000 memory not just a PC!). They will also be OSCAR 13. Their NB-96 plug in channels and covers the exhibiting their own stand-alone modem will offer communica- frequency range 1 - 650MHz tracking system which requires tions with Oscar 14 - UoSAT D. plus 850 - 1300MHz. It comes no computer at all! In addition to Other new products on display with 10 search banks pre- the existing terrestrial packet will be the exciting Kantronics programmed for the UK and range, which will include the "DATA ENGINE" and a includes a full set of accessories. very latest EPROM updates for memory expansion system for including high capacity Ni -Cads. most popular TNCs and the popular TINY 2 series TNC. carry case, shoulder strap. belt clip. DC cable and earpiece. The WB I will sell at £289.

mosnerffluifflom mumnum 7

PSK RN Electronics R & D Electronics Stand S58 Stand E6 A series of new 6m and 4m The increasingly popular range transveners offering high of R & D weather monitoring performance at reasonable cost equipment is now to become will be on show with RN available as individual modules, Electronics, together with their with or without cases, to enable latest amplifiers. enthusiasts to build up a weather station to suit their own requirements. The R & D stand will be offering such modules on ICS Electronics Ltd Stand E7 the wind speed and direction units for only £139. A host of new products will adorn the ICS stand. The DL- 1500 dummy load boasts a frequency range of DC - 650MHz and a short term power capability of I500W. "Outstanding performance" is ICS's verdict on the IsoLoop HF

Loop Antenna which covers 14 - "ttzratr.l. 30MHz at 150W, is omnidirectional, has the gain of Lo d- 6104 k4Fy t o.“ , a dipole and is a remarkable 32 inches square. The MM-3 Morse machine has all the features needed in a memory keyer, including 2-99WPM speed selection, 20 lithium backed memories, comprehensive morse

training facilities and a QS0 simulator which even lets you experience contest operation without an antenna! The AT- 30(X) is the high power version of the AT-300 antenna tuner. This is capable of handling well in excess of UK legal power so there is no likelihood of damaging it. ICS will also carry the range of IsoPole VHF and UHF base station omnidirectional antennas. These include decoupling cones to stop computer hash picked up on the coax.

RADIO COMMUNICATION October 1990 THE LEICESTER SHOW GUIDE Ix LEICESTER SHO W

The 1990 Leicester Amateur Radio Show will take place on Friday 26 and Saturday 27 October, at the Granby Halls, Aylestone Road, Leicester (just off Junction 21 of the M1). This year there will be more exhibitors attending, and the show promises to live up to it's excellent reputation of being THE most successful amateur radio show in the Midlands. Talk-in will be on S22 and SU22 on the special Leicester Show callsign GB2GH. Refreshments will be available from the cafeteria and bar. There are excellent facilities for the disabled.

EXHIBITION HALL

EXHIBITOR STAND NO

Al Electronics 14 Alan Kelly Communications 11 Amdat 15 Coping with Cancer 1 Dataphone 16 Ham Radio Today 10 EXHIBITION HALL Howes Communications 9a Icom 2 MAIN ICS Electronics 7 ENTRANCE Jandek 9 Lowe Electronics 12 Merlin Systems 8 Practical Wireless/Short Wave Magazine 3 Procom (UK) 8a R&D Electronics 6 RA Kent (Engineers) 14a Rich Electronics 13 RSGB 4 Sandpiper Communications 5 Siskin 17 Technical Software 14b Tennamast 15a TW Wraith 13a Wilson Valves 18

/9 0,Io

THE LEICESTER SHO W GUIDE RADIO COMMUNICATION October 1990 FLOOR PLAN AND SALES HALL EXHIBITOR STAND NO EXHIBITORS Altron Communications Equipment 32 Amateur Radio Communications 10 Anchor Surplus 25 ARE Communications 41 Arrow Electronics 33 Astley Videos 45 Badger Boards 57 Barenco 26 Bonex 64 Brial Services 43 CapCo 31 Computer Junk Shop 48 Dee Comm 60 Dewsbury Electronics 4 SALES HALL Display Electronics 13 Dressler Com munications 18/19 Eastern Com munications 22 Elliott Electronics 6 CW TEST Gemini Electronics 1/2 Giacommelli 49a 32 33 Green Telecom 5 Grosvenor Software 62 H Morgan Smith 23 29 Heatherlite 20 34 EXHIBITORS Hiliards 49 BAR AND 31 30 28 Hilton Plant 53a LOUNGE J & P Electronics 38 27 26 35 53 J Birkett 27 53A JAB 37 JMG Electronics 16 36 37 38 JPE Computers 9 KW Communications 21 25 24 Lake Electronics 6a 39 40 55 Lee Electronics 53 22 23 M&B Radio 40 56 Marco Trading 34 MGR Communications 7 41 42 57 21 20 Mutek 17 Nevada 42 17 18 19 New Cross 52 44 )11dVd HVO SH01.19IHX3 SH01.19IHX3 HVO )11dVd Radio Shack 61 4-3 45 46 Radiotronics 51 RAS (Nottingham) 47 ENTRANCE TO 16 Raycomm Communications 36 RN Electronics 58 SALES 47 49 HALL 15 Robin Holderness 28/29 Rollertec 56/63 13 14 48 49A SEM 55 SGS Electronics 35 Sitek 59 South Midlands Communications 8 11 12 50 51 Stevens Electrical 39 Strumech Engineering 14 Syon Trading 30 8 9 10 TAR Aerials 54 Taurus Electronics 3 Trident Computer Centre 44 UMF 24 Waters & Stanton 15 Weirmead 12 Westlake 50

RADIO COMMUNICATION October 1990 THE LEICESTER SHO W GUIDE xi EVADA eTPUK's SCANNER SPECIALISTS FAIRMATE HP100E MICII 1.000 ch. memory. 8-600 Mhz, 830-1300 Mhz Latest UK Version £249 FAIRMATE HP 100E VVB I 6 Royal Parade Limited Edition Wicleband Version o e ee e Covering 1-600 Mhz, 830-1300 Mhz, e ? Hanger Lane. Ealing, London W5A JET includes 3 Antennas and Charging Unit....£289 Tel: 081-997 4476 Fax: 081-991 2565 PSU 101 Universal Base Ilolder and Charger. powers most makes of H/Held scanner whilst Once again we break the allowing convenient Desktop use £26.50 price barrier. Now a Two JIM LOW NOISE PRE-AMPLIFIERS Suitable for both base and handheld scanners Metre Handheld for • 25- 2100 Mhz • 1.ow Noise GaAs Fu £129.00 inc. VAT. • Selectable Filters • Variable Gù Control • M100 Transmit Version Model M75 for Receivers/Scanners..£69.95 SEE IT TRY rr STAND S41 Model M100 For Transceivers £79.95 Model M50 Low Cost Fixed Gain....£49.95 KEN PRO Send £2 for our Latest Bumper Catalogues Model KT22E. We Supply Dealers Throughout The UK and Europe Call for Details of Your Nearest Stockist Package includes: SCANNERS AND RECEIVERS Nicad Pack, 1COM BEARCAT Charger and 1C-121 £3 99 UBC 50XL £99.95 1C -R100 .£499 BC 55XL.T £99.95 antenna. 1C - R7000 £925 UBC 100X1- £179.00 1C-B7IF £855 U13( loOXIT £199,00 Fully synthesised AOR UBL.200XLT £229.00 Thumbwheel AR 3000 £765 UDC I45XLT Mobile.. £115.00 AR 200 £487 UBC I 75XLT Mobile £169 99 Tuning. AR 950 £249 UBC 750XLT Mobile £235 00 AR 950 DX . p.0.2 unc: 800XLT Base £149.00 10MHz Cover SONY YUPITERU - (JUPITER) on AX. 218/1 D £275 vivr 5000 £,75 1750 Toneburst. IC1:7600 12 £99 .%111 . 6000 Base £345 Air 7 . £229 Pro 80 £299 MISC 600kHz repeater Blaelciaguar MKIII £199 AN! Active Ant £49 shift. Standard AX700 £575 KE N W O O D Lowe IIF 225 Comm. RX £429 Low & High power R :000 Comm. WC- ...... ASA Airband Radio Erg ii; R5000Cornm.RX £875 switch. BUILD YOUR OWN I KW ALL BANI) ATU "Ric Ttn1000 lkw 1-30 Mhz. \1'U Allows Effortless Matching .t Long Wire, Vertical. (5 RV, and Coax Fed Antennas. 1000 Kit Complete £138 I m 1000 Ready Built £168 Phone for more I :11 1000 W/2iCiv Baton.. £199 !.1 0 carnigc for A! morkl..) details.

HIGH POWER COMPONENTS VARIABLE c.ArAcrrotts Ask for BERNIE 150 pi' (9.81:10 £19,95 or BRENDA. 170 g(9.81rv)...... 250 pf (7.81(v) £19.95 250 pf (wide spaced) 1 -1 le £26.95 500 pf (7.8 In) £28.00 750 pf. (7.8kv) £29.95 Roller Coaster I kw JO micro £28 Turns ( minter (48 turns1 £15.95 USE YOUR CREDITCARD FOR IMMEDIATE DESPATCH or 12 monthly HOTLINE (0705) 662145 payments of OR FAX US FROM ANYWHERE IN 111E WOR1.D ON: £12.31 (0705) 690626

NEVADA CO M MUNICATIONS Opening llour, NIcintla) Frida) 9.30 lo 5.30 189 London Road, North End, Portsmouth P02 9.-1E NO11 0119. \ 11 I 1) 1) 1 II 121) 11 10.00-5pm

xii THE LEICESTER SHO W GUIDE RADIO COMMUNICATION October 1990 UNIT 1A CANAL VIEW IND. EST. S.E.M. Q.R.M. ELIMINATOR MK II DEE COMM BRETTELL LANE AMATEUR RADIO BRIERLEY HILL WEST MIDLANDS PRODUCTS DY5 3LQ. NE W FIBREGLASS COLINEARS 2 mtr fibre glass encased colinear A new product for 1990, this half wave over a halve wave colinear gives 4.5dB gain over a dipole, measures just 86" high and 1" diameter. No radials or tuning is required. The aerial is completely waterproof and incorporates a S0239 connector. Supplied with clamp for up to 2" masts. £39.95 + £3.50 carr. 70 cms fibre glass encased colinear New for 1990, a triple hall wave colinear giving 5 dB gain over a dipole measures just 60" tall and 1" diameter like its 2 mtr equivalent. Needs no radials and requires no tuning. Again this antenna is completely waterproof and incorporates an "N" type socket. Supplied with a mounting clamp for up to 2" diameter masts. £39.95 + £3.50 carr. Do you suffer fro m The above two antennas offer very little wind resistance and are ideal where there are severe climatic weather conditions or unsightly Vagi arrays are out of the question. local interference? END FED HALF WAVES Who doesn't? This unit will eliminate it for you as it has for Our new 2 mtr end fed hall wave is similar in design to the 1,000s of users, worldwide. above colinears, this antenna however is encased in a 1" diameter plastic tube measuring just 52" tall. an S0239 It connects in your aerial lead (you can transmit through it) socket is enclosed in a 10" aluminium base which also takes and it "phases" out the ORM before it arrives at your the supplied mast clamp for up to 2" dia masts. £12.95 + receiver. ANY SORT OF INTERFERENCE so long as its £3.50 carr. location is within several miles of your receiver. Our new 70 cms end fed half wave is of the same No more problems from next door's electric drill, TV or your construction as the above 2 mtr version but only 31" high and has an "N" type socket at the base. It is completely own computer. You can phase out your local radio station weatherproof and is supplied with mast clamp. £14.95 + completely and listen to a distant station on the same £3.50 carr. frequency! The above two aerials are perfect where space is limited and large aerials cannot he used. No tuning or radials are needed_ Proble ms with a Our new 4 mtr end fed hall wave has a fibre glass and aluminium base section and a two piece radiating element. The overall height is 90" and is terminated with a S0239 local station? socket supplied with mast clamp. £17.95 + £3.50 carr. Even if it is caused by a strong signal overloading your All the above half waves are ideal for both base station or portable use and offer good Omni-directional. low angle receiver the Q.R.M. Eliminator removes it BEFORE it radiation. arrives at your receiver. STAINLESS STEEL FITTINGS * NE W * Ask us and we will send you a copy of the Chris Lorek We are now able to offer to mail order customers a large (G4HCL) review in April's "Ham Radio Today". When he range of stainless steel fittings, including wire, nuts, bolts, asked us for a unit to review he was sceptical but soon washers, self tapping screws and jubilee clips in various became -hooked". Another amateur said "I don't know how sizes. Please telephone for details. I managed the last 40 years without one!" Why not join NE W FIVE BAND H.F. MOBILES * NE W * them? Covering 10, 12, 15, 17 and 20 mtrs, this antenna consists of The MK II is wideband from 100KHz to 60MHz. Cost is a black helically wound fibreglass base approx 57" long £89.50 inc VAT and post and is in stock. plus the stainless steel whip sections for the above bands terminated with a 3,,8 UNF thread. These are very easy to tune and offer excellent value at £29.95 plus £3 carr. 12 MONTHS COMPLETE GUARANTEE * Stand No. S60 at Leicester * INCLUDING TRANSISTORS A SMALL SELECTION OF OUR MASTS NOW AVAILABLE BY POST

_ 1

MAST SETS IN STEEL OR ALUMINIUM OUR STANDARD MASTS ARE SUPPLIED IN 4' x 5' INTER- Send for our catalogue LOCKING SECTIONS IN THE We also make Aerial Matching Units both transmit and receive. Guy Rope Kits sto FOLLOWING DIAMETERS: Audio Filters, Noise Bridges, Morse Keyers. TVI filters, 2M Power/ x 3 way guy nag £15 me , £4 Steel Ally P&P Pre Amps, Freq converters, Pre-Amps. Absorption, wave meters etc. 6 x thimbles 1Y," dia. £10.00 15.00 3.50 12 x wire rope grips Hioury Prices include VAT and delivery. C.W.O. or phone your CREDIT 1y," dia. 12.00 20.00 3.50 3 x turnbuckles n , n CARD No. Ring or send coupon for further data or catalogue. 30 metres wire rope Ile P&P £4 2" dia. 18.00 36.00 4.00 Orders or information requests can be put on our Ansaphone at cheap rate times. NEW FIBREGLASS COLINEAR — 2 mtrs £39.95 p&p £3.00 1* 1 W e also stock HB9CV's, ZL Specials, Slim Jim's 2 Mtr & 6 Mtr Halo's, trap dipole kits, SWL aerials D Please supply a SEM ORM Eliminator MK II and ATU's, discones, traps. baluns, copper wire, I enclose cheque for £89.50 insulators, dipole centres, rope, spreaders. Charge to my credit card Access/Visa/Mastercard Winches 400lb £12.95 800lb £16.95 1000lb £19.95 1200lb £22.95 1400lb £24.95. (tick). Number Exp. Date Wall brackets, fixing bolts, u bolts and mast cla mps guy rings, thimbles, turnbuckles and rope grips and large range of D Please send catalogue tuning caps & roller coasters etc. As you can see all our products are too numerous to mention. Send £1 refundable against any purchase for our full ki Name Call catalogue and price list. Address TEL: 0384 480565 FAX: 0384 481330 Postcode Tel . 1/Ise and Access UNIT R, UNION MILLS TRADE ENQUIRIES WELCOME ISLE OF MAN SEE YOU AT YOUR LOCAL RALLY ▪ Telephone (0624) 851277 S.E.II/1. • ▪ mum e-

RADIO COMMUNICATION October 1990 11.1.11 M MI ffle U rEICESTER SHO W GUIL A MI GREAT NAMES from RADIO SHACK See us at STAND S44 LEICESTER SI-10W It's bargain time at PACKET STAND 561 RADIO LEICESTER SHOW! FROM SPACE! New and used Collins, Siskin Electronics have a policy of supplying the best range Drake, Yaesu, etc, of packet radio equipment available for both terrestrial and space enthusiasts. What you see below is a very small PLUS cut price deals selection of what must be the widest selection of packet radio products in Europe. The advent of the new Alicrosats has on — introduced a new range of possibilities previously considered impossible, our equipment will help you reach those goals. SCA NNERS! The Siskin Tiny 2 Packet Radio TNC Derived from the popular TNC-2 standard the TINY 2 is an ideal BCNU/73 base building block for a comprehensive digital satellite ground Terry Edwards, G3STS station. A standard modem disconnect header allows connection to a wide variety of external modems such as the G3RUH FO-12/ 9600 boards and our own external modems. The "KISS" protocol required for successful ground station operation is also R A DIO SH A C K LTD included together with a comprehensive battery backed Personal 188 BROADHURST GARDENS. Message System for terrestrial applications. The Tiny 2 is LOS1DON NW6 3AY. (Just around the corner from Hampstead Stalkon on the Juhklee Lkne supplied with all connectors and software for most popular home Giro Account No: 588 7151. Far 071-328 5066. Tel. 071-624 7174 computers. 1200 baud version £129, 9600 baud version £219 The PacComm PSK-1 Microsat Modem The PSK-1 modem simply connects to the Internal modem Manufacturers of the disconnect header of most popular TNCs and offers the following world's largest selection 04 features: of "hand built" morse - - OSCAR 13 telemetry 400 baud reception. Access to packet radio keys. World wide exports' BBSs of OSCAR 16 (PACSAT), OSCAR 19 (LUSAT) and FUJI- both amateur and" l e:0 e ',> .11 OSCAR 20.1n additional reception of OSCAR 18 (WEBERSAT) professional. British is catered for but please note special software (available from craftmanship at its best. AMSAT UK) is required for image processing. North West area agent for The PSK- I may easily be switched out of circuit for normal the AEA MM-3 Morse machine. terrestrial packet communications. The modem may be controlled by front panel push buttons or via a computer terminal with simple terminal software using menu driven commands. A built G4ZPY in RS-232 (also configurable to TLL) provides output of OSCAR 13 telemetry, display/control of the modem functions and PAD DLE KEYS support for external tracking devices such as the Kansas City 41 Mill Dam Lane, Burscough, Ormskirk L40 7TG. V7S.4 Tracker etc. The PSK- I also controls the up/down microphone Tel: 0704 894299 control compensating for doppler shift etc. Send business size SASE or 21RCS for details. £189 including telemetry cable NB-96 9600 Packet Radio System I he NB-96 series of products provides for communications with UoSat OSCAR 14 and terrestrial 9600 packet systems. This product is a licenced version of the G3RUH 9600 packet radio NEW! 40M CiRP TCVR KIT modem and is fully compatible with existing G3RUH systems. Guaranteed complete to the last null Me NB-96 daughter board — simply connects to the modem *2wattscw output 7-7.1MHz disconnect header of most popular TNCs. In many cases the NB- *Stable VFO * Adjustable 06 may be mounted directly inside the TNC cabinet (ic most sidetone it Sensitive DC AX l'acComm/A EA models). *Attenuator* Audio filter * Black case * Printed panels Built and tested with full instructions — £95 DTR7 Kit £84.50 also troth a waft range of associated equipment such as tracking systems. rotator Ready Built £135 hardware and conventional packer radio equipinent. why not call ur for a demo' ORP PWR METER/DUM MY LOAD Siskin Electronics Ltd * 25 milliwalts to 20 watts *50 ohm *10KHz-150MHz PC House, 2 South Street, PM20 Kit £19.50. Ready Built £28.75 Send SAE for brochure or call Alan G4DVW on 0602 382509 ilythe, Southampton SO4 6E8. r ill Fax: 0703 847754 LAKE ELECTRONICS 7 Middleton Close, Nuthall, Nottingham NG16 1BX TEL: 0703 207155/207587 (callers by appointment only) x iv THE LEICESTER SHO W GUIDE RADIO COMMUNICATION October 1990 NE

FAX and WEATHER Versatower: SATELLITES Full resolution charts and greyscale pictures from any XXV+ SPECTRUM computer to a dot matrix printer. Basic system £40 plus interface for FAX £40 or WX SATS £59. Still first choice TX-3 RTTY CW ASCII TRANSCEIVE et. The best software available with every fe 0 U could want. Needs TIF1 interface or ter nit. BBC-B/Master and CBM64 tape £20, disc S EC- TRUM tape £35, +3 disc £37 inc adapter Also VIC20 RTTY/C W transceive program £2

RX-4 RTTY CW AMTOR REC

4-mode performance, superb feat eell eilnd ease of use make this still a best-seller. N IF1 interface. BBC-B/Master, CBM64 tape £25, £27. VIC20 tape £25. SPECTRUM tape £40, + £42 inc adapter board (needs TIF1 also). Soft/ 411145are- nly version (input to EAR socket) tape £25, +3 . c £27. VERSATOWER RANGE TIF1 INTERFACE Design d r TX-3 and RX-4 Seceons Reacted Wended software and only aval with them. Kit £25 M. (assembled PCB + cable , connectors) or ready- Mitli Se, es 3 5 made, boxed with all co nect ons £40. A range of telescopic towers in 1" Genes 3 6.7 13.7 static and mobile models from Standil 7.5 to 36 metres with tilt-over Seem 131120 2 7.0 110 GX- X SSTV facility enabling all maintenance 3 LO 11.0 to be at ground level. SCEIVE Hemet Designed in accordance with CP3 2 78 110 Greyscale FAX a • ono and colour SSTV on the Chapter V: part 2: 1972 for a 3 LO 11.0 BBC computer. tastic system. Reviews March 90 minimum wind speed of 85 mph ¿.oii. to5 210 Amateur Radi an August 90 Ham Radio Today. in conditions of maximum ' 5. khe 125 30.0 Complete sys f EPROM, interface, instructions, exposure and specified by Retracted - blended bets hsted.nommalonly leads, only £99 or £119 with direct FAX printing option. professionals world-wide where Extended ite9ht. Glowed Welt° ceribe of May. hostile environments demand the ultimate in design, quality and kl ecabes select to> MODE RECEIVE reliability. Ilarimum menu* head lood - re» Egosure ol locroon - mama.« speed. Every p ie . re feature and performance to receive FAX, HF HF PACKET, COLOUR SSTV, RTTY, CW, Note models made ' suppbed orth °eery AMT , U SAT and ASCII on any BBC computer. Guys Rev• ct 89 Ham Radio Today and March 90 »models - choice of ground wool Am adio. Complete system of EPROM, interface, Tec Neu I Slat radeffie lo Mme o model in tns, leads and demo cassette £259. selection. CO APT-1 WEATHER SATELLITE MODULE

Enables all weather satellite signals to be displayed on Authorised Dealer any FAX system. £59. Version for our RX-8 system just Available from South Midlands plugs in and only £39 if ordered with RX-8. Strumech Versalower Limited. Communications Ltd BBC LOCATOR with UK, Europe, World maps £10, Portland House. Coppice Side. School Close MORSE TUTOR £6, LOGBOOK £8, LOCATOR £7, Brownhills. Walsall. West Midlands Chandlers Ford Industrial Estate RAE MATHS £9 for BBC, SPECTRUM, CBM64, WS8 7E%. England. Eastleigh Telephone: (0543) 452321 VIC20, Electron. BBC, CBM64 programs available on Hants. SO5 3BY Telex: 335243 SEL G. disc at £2 extra. Fax: (0543) 361050 Lots of information available about everything, please Agents in ask. Prices include VAT and p&p by return. West Germany. France. Netherlands. Belgium. Sweden. technical software Switzerland. Norway and Italy. upf," Fron, Upper Llandwrog, Caernarfon LL54 7RF. e i Tel: 0286 881886

RADIO COMMUNICATION October 1990 THE LEICESTER SHOW GUIDE XV Be Sure to Visit the

RSGB Ji Stand

STAND E4

Book Sales

Take advantage of the reductions on prices by purchasing your books at counter prices at the show.

Membership Services

Membership Renewals - Please bring your subscription renewals notice with you for easy reference.

New Members - A free copy of the Society's journal Radio Communication will be given to applicants on joining the Society at this show. New members 15% discount will apply on all purchases made at the RSGB stand.

RSGB Newsletter Subscriptions - (Renewals or new) Please bring your subscription renewal notice with you for easy reference. New subscribers will receive a free copy of the latest news sheet.

HQ staff and volunteers

on hand to answer queries, be they technical, RadCom or general. Take the opportunity of meeting RSGB staff and volunteers who will be happy to assist you.

xvt THE LEICESTER SHOW GUIDE RADIO COMMUNICATION October 1990 COPING W ITH CANCER (Leicester Group)

An additional stand, and a variation from the norm, this year is to promote the 'Coping with Cancer' group in Leicester in honour of the late G4CPY Neville, who had always taken charge of the talk-in station at the Granby Halls.

The 'Coping with Cancer' Group exists to help people cope with the practical and emotional problems following a diagnosis of cancer. This service is for the sufferer and their families.

The group uses their own personal experiences of cancer, giving caring support - sharing can, in fact, lessen the FEAR which is often more of a problem than the illness itself.

The Group aims to provide a service which will improve the overall care of cancer patients in the community, especially those who are unaware of the many organisations and benefits available to them. Medical advice is not given, excepting for referrals and passing on information.

Help is at hand at all times, both for the sufferer and their family, by contacting Leicester 621112 or by calling at Spencer Chambers, 4 Market Place Leicester, LE1 5GF.

Most of the items being offered for sale on the 'Coping with Cancer' Stand will be goods made by the members of the group, items include soft toys, cushion covers, dried flower arrangements, patchwork quilts etc.

RAFFLE: There will be a raffle to raise money on behalf of the Group, and among the prizes is a traditional wooden rocking horse (valued at £800) and a beautiful patchwork quilt (valued at £500) both of which have been generously donated for this event.

The photographs are of G3FFC Arthur and his XYL Nora who have both benefitted from the assistance of the 'Coping with Cancer' Group.

i•ev; RADIO COMMUNICATION October 1990 THE LEICESTER SHO W GUIDE xvil The 1990 CALL BOOK and Information Directory

is on sale for the two days of the Leicester Show at these unbeatable prices . . .

Me mbers Price: £5.00 W Non-me mbers Price: £7.70

on STAND NO. 4 (Exhibition Hall)

xviii THE LEICESTER SHO W GUIDE RADIO COMMUNICATION October 1990 Leading Edge Products fromICS

P K-232 MBX 'K-S8 Packet TNC Multimode Terminal IsoLoop" HF Loop Unit Unique operating features com- Antenna bined with proven hardware and With over 40,000 units shipped software design make AEA's PK-88 worldwide, the PK-232 MBX is the The performance of this low profile your best choice in packet radio. Un- world's leading multi-mode data loop antenna is not compromised by like many other designs, it includes controller. Combining all amateur its small size. Operates from 14 - 30 an HF modem. A sophisticated per- data com munication modes in one MHz in areas with planning consent sonal mailbox with non volatile 18 problems, from flats or apartments - comprehensive unit, the PK-232 KByte memory is standard, as well MBX offers Morse Code, Baudot, or simply take it on holiday. as CW ident.The PK-88 allows multi- ASCII, AMTOR/SITOR 476 and 625, ¡ 50 31l Rated at up to 150 watts, ple single frequency OS0s, HF and VHF Packet, WEFAX receive the IsoLoop radiates with the gain of digipeating and networking. It offers and transmit, TOM, as well as com- a dipole when mounted horizontally. superb value, with direct NET/ROM mercial standard NAVT EX Radiation is omni-directional, and TCP/IP compatibility. The fol- automated marine information ser- horizontally polarised and at a low lowing features are not found on vice. angle to the horizon. Tuning is by other TNCs:- 20 front panel status and means of an inbuilt stepper motor, WHYNOT com mand - Shows driven by a small remote control mode indicators reasons why some received box.The IsoLoop needs no ground Exclusive SIAM '" Signal packets are not displayed. radials, and is well insulated from its Identification and Acquisition "Packet Dump Suppression" feed line. mode - Prevents dumping unsent :H-11h Q Design- One of the unique packets on the radio channel TDM Time Division Multiplex features of the IsoLoop is its inherent when the link fails. decoding high O. The IsoLoop can be con- CUSTOM Com mand - Mows PakMair mailbox with sidered as a very sharp tuneable fil- limited PK-88 customisation control of third party traffic ter that radiates. The narrow for non-standard applications. • FAX printing - supports most printers bandwidth suppresses transmitter Enhanced MBX com mand - harmonics and attenuates strong Two radio ports Permits display of the data in out of band signals from nearby Host Mode for efficient I and Ul frames, without transminers which could easily over- program control packet headers or retried load your receiver. frames. KISS mode for TCP/IP Compact The IsoLoop is only 32 Enhanced MPROTO network protocol compatibility inches square, and packs down to com mand • Supresses 32K RAM, Lithium backed half this size for transportation. display of non- ASCII packets Many features for the digital When mounted horizontally for om- from Level Three switches SWL nidirectional use, it needs no rotator. and network nodes. PRICE INCLUDES FREE IBM-PC le;0 1-L. Ask us about AEA's unique PRICE INCLUDES FREE IBM-PC :* AND CBM-64 DATA, FAX TER- low radiation angle omnidirectional :•:: AND CBM-64 TERMINAL MINAL SOFTWARE ON DISKETTE antennas for VHF and UHF. SOFTWARE ON DISKETTE ,3K-232 MBX: £299.95 inc. IsoLoop: £299.95 inc. VAT 'K-88: £129.95 inc. VA (£5.00 post, packing) (£5.00 post, packing) ••• (£5.00 post, packing) :,• .„,

•

etved ediejel eLri• 30 Low Pass Filter DL-1500 Dum my Load • Reduces television interference e Air cooled dry load from HF transmitters • 50 Ohms impedance • 30 MHz cut off frequency • DC-650 MHz \ • • Low insertion loss *Short term RF power to 1500 watts • 1500 watts power handling •VSWR < 1.3:1 at 650 MHz •VSWR < 1.3:1 • 9 pole inverse Chebyshev design DL-1500: £69.95 inc. VAT LPF-30: £39.95 inc. VAT (£5.00 post and packing)

ICS Electronics Ltd. Unit V, Rudford Industrial Estate, Ford, Arundel, West Sussex BN18 OBD ire VISA Telephone: 0903 731101 Facsimile: 0903 731105

xix THE LEICESTER SHO W GUIDE RADIO COMMUNICATION October 1990 o ICOM ICO M are proud to introduce the IC-R72 Com munications Base Receiver to comple ment the IC-R100 Mobile and IC -Ri Handheld receivers giving the enthusiastic listener a full choice.

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Features: IC-R72 Com munications Receiver • Direct Frequency ICOM's communication receivers have a reputation for entry reliability and quality. Building on this reputation the IC-R72 • 99 Memory HF receiver is one of a new line of wideband receivers to Channels satisfy listeners everywhere. This compact receiver has continuous coverage from 100kHz • Built-in clock — 30MHz, in SSB, AM and CW modes. An optional U I -8 adds and timer FM reception. The easy to operate IC-R72 is superb for • AC/DC operation beginners or experienced DX'ers alike and is equipped with a variety of functions. • Noise Blanker The IC-R72 boasts a unique internal storage battery which • Pre-amp und provides approx. one hours operation when an external Attenuator supply is not available, making it ideal for portable use or during power failures. The IC-R72 joins ICOM's current line of • ICO M's DDS system quality receivers. For a free brochure on this or any other ICOM (direct digital Amateur Radio product contact your local authorised ICOM synthesiser) dealer or ICOM (UK) Ltd.

Icon' (UK) Ltd Dept. SW, Sea Street, Herne Bay, Kent CT6 8LD. Tel: 0227 741741. Fax: 0227 360155. Visa St hilcuttercords: Telephone orders taken by mail order, instant credit & interest-free HP. Despatch on some day whenever possible. VISA CI] MULTIMETERS iiiñ

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Cirkit's new range of Digital Multimeters offer a quite unbeatable combination of features and value: • Ranges include: frequency, capacitance and temperature • Housed in strong ABS cases • Overload protection on all ranges • Full one year warranty

• 31/z digit, auto zero, auto polarity LCD, plus low batt indication • 200 hour battery life • All meters supplied with test leads, battery and manual TM5315B TM5365 OUR COMPLETE LINE OF PORTABLE OWER TOOLS. When you're talking Yaesu handhelds, power takes on many meanings. Like maximum RF output. Sophisticated microprocessor control. Deceptively simple operation. Even cost savings—as most accessories are interchangeable throughout the line. Added up, it's no wonder amateurs choose Yaesu HTs more than any others. FT-470. DUAL-BAND OPERATION PERFECTED. 2 metre and 430-440 MHz 42 memories. Simultaneous receive of both bands. Dual VFOs each band. Paging feature. DTIVIF autodialer (10 memories, 15 digits each). Auto repeater shift. Scanning features. Auto power-off. Battery saver. Audible command verification. Keypad and rotary-dial frequency entry. Battery packs available from 2.3 to 5 watts. More. FT-411 SERIES. MAXIMUM SINGLEBAND PERFORMANCE. 2 metre FT-411 and 430 MHz FT-811. 49 memories. Dual VFOs DTMF autodialer (10 memories, 15 digits each). Auto repeater shift. Scanning features. Auto power-off. Battery saver. Audible command verification. Key-pad and rotary-dial frequency entry. Many battery packs available, from 2.3 to 5 watts. More. FT-23R SERIES. SMALL, SMART, RUGGED. 2 metre FT-23R, and 430 MHz FT-73R. 10 memories (7 store odd splits). Memory scan at 2 frequencies per second. High/low power switch. LCD power output and "S"-meter display. Auto-battery saver. Alluminium-alloy case. Water-resistant seals. Many battery packs available, from 2 to 5 watts. More. Want more information? Call (0703) 255111 Or call into your local authorised Yaesu dealer and ask about the FT-470, FT-411 and FT-23R Series handhelds. The power in handheld performance. South Midlands Communications Ltd, S M House, School Close, Chandlers Ford Industrial Estate, Eastleigh, Hampshire, SO5 3BY. Telephone (0703) 255111, Fax (0703) 263507, Telex 477351 SMCOMMG. YAESU

Prices and specifications subject to change without notice.