Radio Communication
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( 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 144mHz 430mHz Compact FM Handheld Transceiver TH-27E/TH-47E Compact FM Handheld Transceiver 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.