B U L L E T I N Ju N E 1965

B U L L E T I N JU N E 1965

VOL. 41, No. 6

JUNE 12-13

JOURNAL OF THE RADIO SOCIETY OF GREAT BRITAIN THE E DI )YSTON 1E. M ODEL "EC 10" TRANSISTORISED COMMUNICATIONS RECEIVER

RUGGED, LIGHT AND COMPACT FOR PROFESSIONAL AND AMATEUR USE

A most efficient transistorised receiver giving an excellent and consistent performance over the whole range from 550 kc/s to 30 Mc/s. Thirteen transistors and diodes, including stabilising Zener diode. Ample audio output to internal speaker, and panel jack also fitted for telephone headset. Precision slow-motion drive with 110 to I reduction ratio ensures delightfully easy tuning. Self-contained battery unit holds long-life cells. Alternative aerial inputs for dipole, long wire and short wire aerials. Selective audio filter improves c.w. reception. Robust construction, modern styling, attractive two-tone grey finish. Dimensions are 124 inches wide, 6i inches high, 8 inches deep. Weight with batteries 14 lbs. List Price (in U.K.) £48.

'STRATTON it CO.LTD. BIRMINGHAM e n:landl

RSGB BULLETIN JUNE, 1965 leant

1000V 1000V 250V 1 250V //C) 100V / • '- 100V 1. /O. s. 'tsç,;\ with the e / 25V.... 25V

x performance I A \?4y X100 / / kmA /N et74. •I mA I mA fisA MULTIMINOR AM to send you a full specification of this great little The newly improved model of this It is simple to use, one rotary switch instrument. It measures famous AVO pocket size multi-range for instant range selection, only one only 7f x 4 x ins, and instrument has been enthusiastically pair of sockets for all measurements, weighs only 24 out. acclaimed in all parts of the world for and a 2I-inch clearly marked scale- its high standards of accuracy and plate. It is supplied in an attractive RESISTANCE: 0-2M a in 2 ranges, using I.5V cell. dependability as well as for its modern black carrying case complete with SENSITIVITY: 10,000 il,/V on d.c. voltage styling, its highly efficient internal interchangeable test prods and clips. rang «. assemblies and its resistance to ex- and a multi-lingual instruction I M O WN, on a.c. voltage tremes of climatic conditions. booklet. ranges.

e et.7,.:1r 15 1'113 AVOCET HOUSE • 92-98 VAUXH ALL BRIDGE ROAD • LONDON, 8.W.1. Ti VIC 34( L‘ (12 A ll•••

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RSGB BULLETIN JUNE, 1965 353

• A CCILJUILL CO M MUNICATIONS The hallirrafters range of amateur radio equipment is now available through Courier Communications, U.K. appointed distributors. Some models are in stock, others are on the way.

For the 2 metre enthusiast THE SR-42 TRANSCEIVER Compact size, mobile/fixed/portable station; 14 watts input, plate and screen modulation; Final tube 7551; 4 Xtal positions plus optional v.f.o., switched from front panel; Push-to-talk facility; Neutralized nuvistor front end; Switched S-meter/output indicator; Built-in a.c. and I2v. d.c. power supplies (vibrator extra). £76 I5s. Od. with one Xtal

For SSB types THE FABULO US SR-I50 SS13/C W TRANSCEIVER A brilliantly engineered SSB/C W transceiver, I0-80m; Features RIT—receiver incremental tuning, pioneered by Hallicrafters; I2DQ6B's in final, 150 watts PEP; Built-in VOX and Xtal calibrator; Features AALC—amplified audio level control; Size 15 in. wide, 6+ in. high, 13 in. deep. £299 Matching A.C. power supply and speaker £44 Mobile power unit £50

For those requiring complete flexibility, we suggest the SX-117 receiver and HT-44 transmitter. THE SX-I17 RECEIVER Triple conversion 10-80m. AM/C W/SSB; Variable selectivity; Built-in calibrator and notch filter. £190 THE HT-44 SSB/A M/C W TRANSMITTER 200 watts PEP and 50 watts AM; Built-in VOX or manual control; Break-in CW: AALC— up to I 2db compression—real punchy signal without splatter. Can be used in transceive with the SX-I 17. £195 Uses P-150AC power supply. PACKAGED DEAL. SX-117, HT-44 and P-150AC power supply £399 (saving of over f30). Introducing hallierafters Master Kits of test equipment Comprehensive range available including: THE HM -I VACU U M TUBE VOLTMETER NOTE! This is a robust instrument with a large meter. Unlike other similar VTVM's this one measures D.C. CURRENT TO O, besides volts and ohms. Wonderful value £14 19s. 6d.

THE HG-I R.F. SIG NAL GENERATOR 50 kc/s to 880 Mc/s; 400 c/s modulation built in; Fine and coarse attenuators; A.C. line filter. £l3 I9s. 6d. CO MING SOO N! The SR-500 500 watt transceiver The SR-750 750 watt, five band transceiver. BEFORE COMMITTING YOURSELF TO OTHER EQUIPMENT, SEND FOR DETAILS OF THE HALLICRAFTERS RANGE

COURIER CO M M U NICATIO NS, 182 Pentonville Road, LOND O N, NJ. Phone: BRU 6358 (Arec Code 01)

354 115GB BULLETIN JUNE, 1965 Volume 41 No. 6

June 1965

3/- Monthly

CO NTE NTS

365 Subscription',

366 News from Ileadquarters

367 Transequatorial Propagation during the Years of .the Quiet Sun. By R. C. Cracknell, ZE2JV and R. A. Whiting, ZC4WR

EDIT OR: 371 Co-axial Relays. By H. J. Dohlus, DJ3QC

John A. Rouse, G2AHL 375 News... By John Clarricoats, 0.B.E., G6CL

376 QUA Associates. By K. L. Smith, G3JIX

378 A V.H.F. Beam Rotator. By A. W. Tomalin, G3PTB EDIT ORIAL ASSISTANT: T. R. Preece, G3TRP 379 A Distributive Survey of Amateur Radio in the British Isles. By T. H. Holbert, GM3DXJ

384 Mobile Column. By E. Arnold Matthews, G3FZW EDITORIAL OFFICE: RSGB Headquarters, 28 Little 388 RAOTA Reunion Russell Street, London, W.C.L 389 The Month on the Air. By M. E. Bazley, G3HDA Telephones: HOLborn 7373 HOLborn 2444 395 Four Metres and Down. By F. G. Lambeth, G2AIW

398 Scottish V.H.F. Convention

398 The OSCAR Story—Part III. By W. H. Allen, G2UJ ADVERTISE MENT M ANAGER: Mrs. P. D. Harvey, 399 Society Affairs Sowell & Sons Ltd., 399 GB2RS Schedule Ludgate Circus, London, E.C.4 Telephone: FL Eel Street 4353 400 Slow Morse Practice Transmissions

401 Letters to the Editor

402 Contest News

403 Contests Diary

404 Forthcoming Events

406 Clubroom

416 Index to Advertisers

The RSGB Bulletin is published on the first Wednesday in each month by the Radio Society of Greot Britain os its official journal and sent to all members. Radio Society of Great Britain, 1965, the closing dote for copy for the next issue is june f I. CO DAR A.T.5 GOING MOBILE

Tho 12 MIS 12 volt solid 12 W ATT 2 BA N D state power supply Unit and 12 ft/C Remote Con- trol Unit provide full MINIATURE TRANSMITTER I mobile facilities for the AIS Transmitter. Just plug in. that's all! Fast and easy changeover means one Transmitter for home aid "The I mobile use. The 12 M/S P.S.U. uses a total of 7 tiny I I conservatively rated semiconductors in conjunction with a TX with , ferrite cored tot oid transformer to provide high efficiency with extreme reliability. In addition a unique the 1 feature is the built-in remato control facility using a precision micro- miniature heavy duty relay which allows for easier installation and avoids BIG I LT. voltage drop and heavy duty wiring. Dimensions 6¡" x 3¡" x 2. Complete with 4' power supply and control cables. installation data, Designed voice" £11 .B . O Carriage Si-. for both home station and m >bile use, The 12 R/C Remote Control The CODAR 'ATS 2 Band 160/80 metre miniature Transmitter sets a I Switching Unit provides all new high standard in performance, styling and rugged reliability at a switching, STANDBY/NET! cost that defies comparison. High stability new type V F.O. with easy TRANSMIT and aerial to read calibrated dial 1.8-10 McIs and 1S-3.8 Mc/s (up to 4 Mcis for changeover switching. plus export) Plate current meter. Plate and screen modulator plus modula. I H.T. ON indicator. Dimen- tion peak indicator. Low loss air spaced CODAR-QOIL Pi-net output. sions 5" x 2" it Ir. Complete AM/C W function switch and panel key jack. Plug changeover for 6 or with plugs, 12 volt heater supply. Size ar 5- x 4. £2 . 7 . 6 Carriage 3/.. PRICE CO MPLETE £1E1 . 10 . O Carriage 4/, H.P. Terms Available For an unbiased opinion ask the chap who uses ono, there's lots of them! CODAR RADIO COMPANY Matching P.S.U. Type 250/5 for 200-2S0 A.C. with Standby! Net/trans- BANK HOUSE, SOUTH WICK SQU ARE, mit and aerial changeover switching, stabilised V.F.O. supply, neon Southwick, Sussex. Tel. 3149 H.T. standby/on indicator. £8 .O . 0 Carriage 6/6. • •1nr ..an•an. Tweet Ungar.,

1111\111Conionnulinwi. This is a page from our Catalogue.

If you think that the other d Olga RADIO (MITCHAM) LTD. 199 pages would interest \ON-1,1.1i.C111011'fIC C ON.1)1 • •-‘11iS--( unline you, send Coupon below, with 6/- R O. tee sve

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ADDRESS litiite 400 ruble Puke 150 ' 4.71, 115 5111)

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RSGB BULLETIN JUNE, 196$ Radio • Amateur Gear • Test Instru ments • Educational • Hi-11 Equip ment -

7 j Better quality Equipment - at low cost by building any ileathkit model

(AI) British models are available in kit form or assembled. Deferred terms availoble U.K. over £10)

HIG H SENSITIVITY GENERAL COVERAGE RECEIVER. "AMATEUR" BAN DS RECEIVER. Model RA-I. Covers all Model KG-I. Frequency coverage from 600 kcis to 1-5 Mcfs and "amateur" bands. 10-160 metres. Half-lattice crystal filter at 17 Mc;s to 32 MO. Send for details. 1•6 Mcfs I.F. Provision for fixed, portable or mcbile uses. Kit £39.16.0 Assembled L53.0.0 Switched USE and LSB for SSS. OPTIONAL EXTRAS available for models RG-1 and RA-I. Kit f39.6.6 Assembled f52.10.0 Q MULTIPLIER, Model GP M-1, May be used with receivers "MO HICA N" GEN ERAL COVERAGE RECEIVER, Model having 450-470 I.F. Provides either additional selectivity or GC-IU. In the forefront of design, with 4 piezo-electric trans- signal rejection. Self powered. filters. 10 transistors, variable tuned BFO and Zenner diode Model QPM-16 for 1-6 licts I.F. stabiliser. Kit 07.17.6 Assembled £45.17.6 Either model Kit E8.10.0 Assembled f12.14.0 Suitable Battery Eliminator. Model UBE-I Kit £2 17.6 "AMATEUR" TRA NS MITTER, Model DX-40U. From 80-10m. Power input 75W C.W.. 60W peak. CC phone. Output "AMATEUR" TRA NS MITTER. Model DX-100U. Covers 40W to aerial. Kit C33.19.0 Assembled f45.8.0 all the "amateur" bands from 160-10 metres. 150 watts DC input. VARIABLE FRE Q. OSCILLAT OR, Model VF.1U. Cali- Own power supply. Kit C79.10.0 Assembled £104.15.0 brated 160-10m. Fixed output on 160 and 40rn. Ideal for our DX-40U and similar TX. SSB ADAPT OR, Model SEI-10U. Kit 09.5.0 Kit L10.17.6 Assembled [15.19.6 GRID DIP METER, Model GO-1U. Continuous coverage 1 -13 REFLECTED PO WER METER. Model HM-I1U Indicates to 230 Mc's. Self contained. Antenna(Tx match. Kit £8.5.0 Assembled £0.10.0 Kit 610.19.6 Assembled £13.19.6

AMERICAN HEATHKIT S.S.B. EQUIPMENT All imported models are subject to any additional import surcharge in force oc time of importation

H W-12E SE-400E RB-300E

M O NIT OR 'SC OPE, Model H O-10E. A must for the SSS SB-300E "AMATEUR" 80-10m. BAN DS RECEIVER. This de luxe receiver offers unsurpassed value to the Radio Amateur. station. Gives at-a-glance visual indication of your transmitted Of advanced concept, employing up-to-date design and con- signal and the incoming signal displaying envelope patterns. Built-in twc-tone generator cnsures a clean output signal. struction techniques, its ultimato specification ensures un- paralled performance. Full specification and details on request. Power reg: 115/230V A.C. 5060 cis. Kit £4.10.0 Weight 221b. Power reg: I15/230V A.C. 50;60 cfs. Size: FILTER-TYPE SSE TRA NSCEIVER MO DELS for the 80, 14j" • 6r 13r. Kit LI33.14.0 less speaker 40. or 20 metre bands. 200W P.E.P. input TX. le sensitivity RX. Employs easy-to-build printed board techniques, with pre. A fitting companion for this receiver is the SB-400E TRA NS- aligned circuits. Power reg: 800V D.C. at 230 mA. 230V D.C. at MITTER. Which is designed for "lock-in" facilities with the 100 mA. 125V D.C. at 5 mA. I2V A.C. or D.C. at 3.75A. S13-300E. A self-powered filter-type TX covering the amateur Model 14W-12E 80m. bands 80 to 10m. with P.E.P. of 180 watts. Weight: 33 lb. H W-22E 40m, Kit E60.1.0 each Kit E165.4.0 Send for full specification. H W-31E 20m. SE-200E Linear A mplifier.' 1200W P.E.P. SSS. 7000W C W. GH-I2 Push-Talk Microphone 0.13.0 Kit E107.10.0 Assembled "CA NTE N N A" TRA NSMITTER DU M MY LOA D, SEN D FOR THE CO MPREHENSIVE ILLUS- Model HN-31. Simplifies servicing and testing. TRATED AMERICA N HEAT HKIT CATAL OG UE SH O WING RANGE. Sent for only 1.. post paid.' M A NY OT HER BRITISH M O DELS Covering a wide range of equipment including models for the Home. Service Workshop, Laboratories and Test depts. Please send me FREE BRITISH CATAL OG UE (Yes/No) SEND FOR FULL CATALOGUE AMERICAN CATALOGUE IJ- (Yes/No)

Full details of model(s) DAYSTRO M LTD NAME DEPT. R116, GLOUCESTER, ENGLAND (Block capitals) ADDRESS THE BRITISH HOME OF HEATHKIT MODELS

RB.6 •

357 RSGB BULLETIN JUNE, 1965 G3ZY -J. & A. T WEE DY (ELE CTR O NIC SUPPLIES) LTD Eddystone Recemers. Components. and Accessories. Codas. Green & Davis. K W Electronics. Heathkit. Mosley etc. 20% DISCOUNT N E W Eddystone EAI2 £185 Eddystone ECIO £48 Eddystone 870A £30.17.6 G. & D. CTR 70 £20 on branded CARPETS G.& D. 3N70 Cony. £16.16.0 G. & D. Mk III Cony £8.19.6 G. & D. Mk Iv Cony. £14.14.0 Codas AIS TX £16.10.0 WILTON, AXMINSTER, ORIENTALS, etc. Codas Pre-amps. (3 multIphers. P.S.Ut etc. No mbren equipment U SE D FREE delivery U.K. G. & D. Falcon TX LIS Eddystone 640 £I4 Olympic TIO0 TX LSS Mosley C MI. Q Huit. & top Expert fitting arranged if required. Write stating Tigress TX £37 band converter (as new) £62 requirements or for introduction to showrooms Minimitter 120 W TX £35 KVV77 U S Eddystone 840A £2S LONDON MAIN cities. Other items too numerous co list. Eagle equipment and accessories. H.P. terms available. DODSO N-BULL CARPET CO. TRA DE.INS ACCEPTED. Sho wroo ms: 2-4 Little Britain, Lo ndo n, E.C.I 21 BIRKIN LA NE. G R ASS M O OR, C HESTERFIEL D. DERBYS HIRE. Tel: H OL ME W O O D 506 Telephone: M O Narch 7171 (10 !Ines)

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C. RADIO LTD. El151 8f- RIM 64 l'733 !S(:: MAST urilERs IN 8rOcit Jeanie Caiknia Hay I' In. EBC33 ID- 6281 84 P780 170 GOLDHAWK RD., W.I2 and Sporial Volees. U.K. °Wert below El P. 8 P. II.; err ERC41 7 - P/4037 5' • 1'781 5 ci ti„ 2/.; over 53, P. A P. tree. C.O.D. 2,10 extra. Orereeaa 616210 5 y 4061 5 P1432 :( S H E pherd's B ush 4946 Peetnee extra nt cent

Open 9-5.30 p.m. except Thursday 9-1 p.m. PE RS O N AL C A LLE RS W E L C O M E I

358 RSGB BULLETIN JU NE, 1965 A COMPLETE ma m% uilifiLe RANGE _Nir vair to fill ALL your requirements

Transmitter Covering the 160 metre band. 10 watt input, high level mod., aerial relay incorporated. E.5140 price £15.15.0

Power Supplies Transistorized unit for mobile use. E.5141 price £8. 0. 0

A.C. Supply for the home station. E.5142 price £7. 7. 0

Whip Aerial Wing mounting, adjustable tuning interchangeable loading coils for all band coverage. E.5159 price to be announced.

Microphone Background noise free, with non kink lead and 'press to talk' switch. E.5150 price £3. 4. 0

Speech For maximum 'talk power' from transmitter. Compressor E.5143 price £5. 0. 0

Convertor Transistorized unit enabling the 160 metre band to be tuned on a M.W. car radio. E.5144 price to be announced.

Lab gear Limited Labgear CROM WELL ROAD, CAMBRIDGE. Telegrams Labgear • Telephone: Cambridge 47301 (4 lines) S.T.D. CODE OCA3.

RSGB BULLETIN JUNE, 1965 359 '1 THE UNIQUE FREE/NI/DE • Practical Electronics VARIABLE FREQUENCY ANTENNA The DX aerial for effEwle any QTH TO BUILD Hear and work that spiny DX with the Joystick - lift yourself out of the frustration of 'lump of wire' local , 11 contacts - pump out a real beefy signal - yes even ELECTRONIC TRUMPET from mude a flat or bungalow. Full-size transistorised musical instrument The COMPLETE SYSTEMS listed below which uses push- comprise de-luxe or standard button note selection "Joystick" (as indicated) plus "Joy- without blowing into the mouthpiece. match"Tuner-S and everything else necessary except Transmitter RESISTANCE,' and/or Receiver! CAPACITANCE BRIDGE A valuable piece of A life time of experience and aerial " know- how" has gone into the development of this test equipment for the revolutionary principle of a Variable frequency workshop. Bridge Antenna on which World Patents are now pend- balance indicated by ing. Possessing the unique property of an even performance over all frequencies between IS: 30 magic eye valve. Linear Mcjs. the Joystick's spacial matching facilities and scales on all ranges. associated A.T.U. ensures efficiency on any frequency. Peak performance for transmission and maximum voltage for reception—the Joystick INTRUDER ALARM is a maiod break-through for ardent SVVLs and Compact transistorised all licensed stations. unit giving audible warning at a pre-deter- SIZE 7'6" Thousands of stations all over the world ore already mined time after entry VERTICAL equipped with the Joystick. through garden gate. 2« 3 METRES Stopped automatically FLASH! by a ring at the front SO MET HIN G FOR FREE I I door bell. (see ''Joy" news No. 10 on page 409)

A poor QTH is now no excuse for Also in the June issue: -- a weak signal - act.. . Practical Electronics ELECTRO NIC ORDER YOUR JOYSTICK NOW 111 BUILDING BLOCKS FULL M O NEY BACK GUARA NTEE if you are not completely satisfied. 111 A.C. MAINS Still not convinced? Complete the coupon VOLTAGE below for a detailed brochure and showers Il STABILISER of testimonials. PAR TRIDGE ELECTRO NICS LTD., VOICE .. Caister House," (Dept. R), Prospect Road, Broadstairs, Kent. Tel: THANET 62535 1 DISPLAY UNIT Please supply "JOYSTICK" system as below: lij Complete "JOYSTICK" transmitting system ea I 7s. 6d. m I Same as above but STANDARD model £7 I6s. 6d. JUNE ISSUE,,, Complete "JOYSTICK" RECEIVING system £7 is, 6d. 1. Same as above but STANDARD model a 6s. 6d. OUT NO W 1/011 Complete "JOYSTICK" MOBILE system a I 6s. 6d. Please send brochures and testimonials. Name (Call sign) II Look out for the July issue, out June 17th. Address Special construction feature Town County (R3) 1 How to Build a Portable Stereo Record Player.' IM M M ZIM MI MI

360 RSGB BULLETIN JUNE, 1965 STAR SR.600 AMATEUR LAFAYETTE HA 63 COMMUNICATION CO M M U NICATIO N RECEIVER RECEIVER New cryntel controlled triple oonverdon de laze 80.10 metre 7 valtee Recliner. 4 Rand* NM bawl reeelver. Extremely high licue-31 Mr:a "8" Mmer•UPO.ANI, aeneltIvity. aelectivity and Bandamead Turyaa 200/210‘'. AA: Special >alum in. - Brand iiew. 24 099. core. paid elude 3 LP. Magee. reYetol eontrolkd ea/dilator. 4 ecction 41. fp I./C 9itor. "8" meter, liFO. MIL, 100 kcfs cryatal cell- I/ V beater, rte. Supplied brand new and guannite.-1 03 ORS. S.A.E. for full •Ictefie STAR SR.40 CO M M U NICATIO N RECEIVER OSCILLOSC OPES 33n kc,a-30 31c/a. "8" aleter• 111,0•ANI.Flandepread Tualug-Bullt Ifigh quality Portable American Owlitoecope. ain. c.r.t. 200/230v. Ar. Itnind iraa T B. 3 cie-30 kg'. X Ann,: 0.300 loti., Y Amp: 0-2 Me/a. 18l GEL Cerriege power requiresucida 1015-125v. A.C. Flapplied In new " remake, fully teetol. 623. care. 10:-. Suitable 2301113v. Traneformer 10,0.

LAFAYETTE '• PREC O N " AMATE UR PRESELECT OR CO NVERTER CLEAR PLASTIC PANEL METERS • (»eta! Controlled • For 80-10.2045.ln Metre Baud. First grade quality, Moving r.01 j'and Marro, available wiwtock. S.A.E. for illmtrated leaflet. Inecounte tor • A. • Converter--Conserla Receiver to Dual Con. v.enion Operation • Improrre Selectivity • Wkleni Rand quantity. Available aa follow.. Type MR. 38P. Spread 3 aryetel• are Inchidel for 21), 13 and lu metre I 21182111. «mare fronta banda. O wen.' on 230v. 50160 cycles A.C. 2 Magee of t.M01 • . 22/0 10V. DC .. 221 RF annul. a high elguel to nob. retlo. 14.A.E. for full aulA , . 22,6 20V. DC .. 22;6 detalle. 19 0/18. P. t P. 71 10mA :: . • 221 20V. DC .. me 201.11. .. 22/8 100V. DC .. 22,1 100mA .. YEi6 1302. DC .. 22:6 150mA . • 22,a 30,9V. DC .. 22/6 TYPE 13 AVO METERS 50µA 321 200m/t •. 221 300V. DC • . 221 D O UBLE BEA M Supplied reConditioned, guaranteed perfect 100.A 29,6 300mA . - 22/6 7150V. DC .. 22'6 OSCILL O- 200szA • 97/8 300mA • . 221 15V. AC .. 22:8 SCOPES M ODEL D t8.19.6 . . 23 - 730mA 2231 30V. AC: . 221 30-le'llstA .. . 29,8 1-0-110/1 ••• ••• HI 22;6 Perfect noter 127.10.0 M ODEL 7 f12.10.0 100.04691.4A .. 27,1 IA. DCue,;',..Je.;:: 22/8 Post and loo. 51- 1100.0-500µA .. 291 DA. DC • • 221 . AC .' .. 22;6 totA ...... DC .. . 22.0 "8" Meter lauA .. 2918 prt0T EXTRA Larger deem avalinble--wind fur Ibile. ILLUMINATED .1" METER. 1 2113210. equate front. Cal. in 8 urea. 6V. lamp. G.E.C. BRT. 402 RECEIVERS TE-18 GRID we. I.. ..: f'. 1:-. Data) 2 3/10111. equare 391. P. A P. 14. A high grade Id valve communication DIP METER reeriver covering 110186 itcla and 1510 M AIN LO N D O N AGE NTS M ODEL kels to 30 lit5+ tu mix bands. Special çonimet-i roc aile' baril operation. FOR CO DAR EQ UIP ME NT DA-I feature' include 2 11F >Mg.. "S" l'orrea 960 kea- TRA NSIS- „, I meter. variable @electivity. Ifni, 220 Mc/10 ou 8 TORISED ' ANL. ADC. 300 kg cryortal calibrator, ratites. For Mti! dbl." nil° render dial with lugging m'oie. FULLY Operation for 95.130y. and 193-23ov. ti tOr. A.C. opera. A UT O MATIC Doti. 810e 71 x 2/ Ar. Output for phone.. meeker or ELECTR O NIC KEYER line. Offered In excellent condition. en. Supplied brim.) new and 131,0. AC. or Batley operated. In- fully bated and guaranteed. 860. cam guaranteed, with in. corporate» bullt-in monitor oecillator, 30 ,-. «ruction, 112.10.0. .pcakor and keying lever. Fully arr. 3/-• adjurUtble opeeda giving either auto, rembauto or hold. 7 trnewistoro, I SEMI.A UT O MATIC" BU G " dieden. 116.10.0. P. â P. 41. TRA NSIST ORISED FIELD Kuper speed 111,30 Preselector Al 19 STRE NGT H METER key. 7 rimed 1.11.39X Hell Poiv.r0ti • £7 4 T M-Srer R.Q.10 "Q" Multiplier 26 15 adjuetutenta 3 loan& 2.3 to 57 Mom "S" METER 11.4.10X Self powered 28 2 I 0 1: 1•31 penal+ racy tune up fur Signal etrenuth no high ea mar. tramonitteroutput. A.T.3 Amateur TX £16 10 A.TA Males P.8.II. £8 0 Mart tiring &wired. Weight Earphone Jack to moni- CIVIL princl. scale for reproducible gettingm. Preebion tor audio. 2110p...A meter, A.T.3 12r. Tranolotur ell 5 plea. Calibrated tooled, antbruat nickel pleted braes cal. 0-10. Supplied coma In it utilM. And dangle.n elect operating parto. $ize Orb, with battery. tele- A.T.3 Remote control and Aerial SwItchlint Cult 12 7 Amarillo-My and fiiin. a 3ln. o Olin. Bread new. acoptc 16.18.6 zero adjust. cool.. P. P. 216. Powage ears. 24.10.0, P. .4 P.2/6. Fe any auperbet receiver with Re•Pilree 150;200 volt and 0 or 12 C OSSOR 1035 DO UBLE volt Complete with calve and full BEA M OSCILLOSC OPES indructIono. 119/6. Poet end pecking 2J6. OM. Calibrated VI Amplifier MULTEMETERS from beret'. to 30v., bandwidth 10 Meta SILIC O N RECTIFIERS Calibrated YO Amplifier from 3v. to 200 P.I.V. 2110 tnA 5110v., bandwidth up to 100 lea, Brand New-Fully Guarenteed-Loweet ever prices- Supplied will >adz, batterim. instrottione 400e. p.i.v. 3 amt. Directly calibrated X dint providing 200e. P.I.V. 6,01111 • time rte.-ore:lent from Itneee. to 1311 millireve Supplied Ili guarantied per- MODEL PT-94. 1,000 O.P.V. 0/1011072301300:1100, 1.000v. P.I.V. 630 tuA, SO0v. P.I.V. 300 ntA fect working order, £35. Con' 20' Ac. and D.C. 0/1/10111300mA. D.C. 11/100 it.9 391. P. A P. 1/0, 400v. P.I.V. 300 tn.& 350 MA R.F. METERS 200v. P.I.V. 200 niA 2111. round Plug in type. 8 8. 4'. I'. I n MODEL 011201 30.000 MODEL AR-620 20.0111, 93y. PAL\. 3 mop . 0.P.V.u/.26/1/10/20/262/ 0.P.V 0110,10/230,80n/ 70r. P.I.V. 1 amp , N ATIO N AL H.R.O. DIALS 300/1.000v. D.0. 11/10/691 1.000v. Al;. and D.C. 1110v. 1.1.V. 165 niA Ilea 27 8. 1.t' fi 2:.8/300v. A.C. 9/130µA/ 0/3001.4A/10.260mA. 0' Diommnte tot olunntitl..q, ro,t 101220 MA. 0/2/1[90011/ 10K/10611.0 Mege. 230 w r. COLLAPSIBLE W HIP n liege tote. P. & P. PP--.02 UPD. e-sea AERIALS 2 6. Hemp.. 92 ,6. P. R.I 07 CO M M U NICATIO N W m( new al, P P. 2.--. RECEIVERS MODEL 600. 30.000 1.2.17.15 Mro. Maw. or 12r. operation. HEADSETS 0,p.v. 0/.3/1/2.5/10PM/ MODEL 20,000 YODEL 2507. 2.006 Supplied In eseellent cooditiou. 115. 1)1,21.8 Low . 10/6 1901266;600/1.000r. D.C. 0. p.v. 0/6.12/220/200/ 0 .1..V. 0/10/60/20or Carr. 301-, W.8.811 Low Imp, with rubber ear 012.3/10/23/100/2301001 2,300v. D.C. 0/10/60/ 2.820v. D.C. 0/10/30/ 1.000e. A.C. 010µA/5/ 800/1.0000, A.C. 0/ 500/2.300v. Ail. 012 chamois padded touring cell • • 224 2010001A. 12 amp. DV. bOgiA,123/240mA. D.C. 0/ Meg..Q. 0/230 MA -20 ARC M RECEIVERS Ditto with microphone .. 961- 0/40/K0 Meg/00 Meg!) 60E16 Ileg..9. .044 to +29 db. 49/8. P. 330 be/a-33 Me:a. Available In excellent S.F.20 Web imp. 99.17.6. Post pmd Num. 7818. p. a 1..210. 2'0 •• aw new •. 1,116. Om. 101- All new. Pad entro.

Send II- P.O Open: 9 a.m.-6 p.m. G. W. SMITH & CO. (RADIO) LTD • for full Every day catalogue Monday to 3-34 LISLE STREET, LONDON, W.C.2 and list Saturday Telephone: GERRARD 8204 9155 Cables: SMITHEX. LESQUARE

RSGB BULLETIN JUNE, 1965 361 I mhof s are now the main distributors for Eddystone communication receivers for now the London area including the Pool of London. Now you can come and see for yourself all the most popular units in a brand new department entirely devoted to Eddystone equipment. And, as you would expect at Imhofs, you can compare them all working side-by-side. If you are unable to visit us you can, of course, order by post with complete confidence. We i mhofs have been sending precious equipment to all parts of the world for over 100 years and all items can be sent abroad, tax free, under our trouble-free personal and direct export UOF schemes. When you buy your Eddystone receiver from Imhofs you can rest assured that you will get individual attention, prompt supply and after sales echlystone service that is second to none

Come to linhofs for the Eddystone 840C now you can buy the world renowned

For w Or dwide reception — frequency coverage 480 kc s-30 Mc sin five ranges. Eddystone multi-wave Soundly engineered to give years of reliable service. £88.0.0d communication receivers Come to Imhofs for the Eddystone ECIO from Imhofs famous New Oxford Street store

A really first class transistoriseu communications receiver that Is tight, I MIE OE'S rugged and compact. Powered by six 'U2' torch cells. £48.0.0d Alfred Imhof Limited Dept 126 112-116 New Oxford Street London WC1 tel Museu m 7878

please send me Come to 'robots for • details of Eddystone communicat on receivers type other Eddystone receivers including This Year of Hi-Fl 1985 Details of Guaranteed Export Service 870A £36.10.4d E535 £71.5.0d EA12 £185.0.0d 940 £133.0.0d Details of Monthly Accounts Details of IM Styli Please tick appropriate squares Information on any of the items that name interest you will gladly be sent on address request • R22

362 RSGB BULLETIN JU NE, 1965 RADIO SOCIETY OF GREAT BRITAIN

INCORPORATED 1926

H.R.H. THE PRINCE PHILIP PATRON DUKE OF EDINBURGH. K.G.

.COU N CIL 1965

PRESIDENT E. W. YEO MANSON, G3IIR

IMMEDIATE PAST PRESIDENT G. M. C. Stone, AMISS. *WERE, 133FZL

EXECUTIVE VICE-PRESIDENT R. F. Stevens, G2BVN

HONORARY TREASURER N. Caws, FcA, G3BVG

ORDINARY ELECTED MEMBERS J. C. Foster, G2JF R. C. Hills, esc(Enio). A WES. AMIERE, G3H RH E. G. Ingram, GMEIZ A. O. Milne, G2M 1 L. E. Newnham, au, GENZ J. W. Swinnerton, TO, BSc (EGON) (MONS) AIL. G2YS Louis Varney, A WES. AIL. G5RV

ZONAL REPRESENTATIVES H. A. Bartlett, G5QA L. N. Goldsbrough, esc(oxoN), MA, G3ERB J. C. Graham, G3TR R. H. James, A WES, AM1ERE, G W3BFH A. D. Patterson, BASc. GI3KYP F. K. Parker G3FUR J. F. Shepherd, GMSEG W

GE NE R AL M A N AGER A N D SECRE TARY John A. Rouse, G2AHL

REGIO N AL RE PRESE N TATIVES

Region 1.-North Western B. O'Brien, G2AMV. I VVaterpark Road. Prenton. Birkenhead, Cheshire. Region 2.-North Eastern. J. R. Petty, G4.1W, 580 Redmires Road, Sheffield 10. Yorkshire. Region 3.- West Midlands. W. A. Higgins. G8GF. 33 Cedars Avenue, Kingswinford. Brierley Hill. Staffs. Region 4.-East Midlands. F. C. Ward, G2CVV. 5 Uplands Avenue. Littleover, Derby. Region 5.-Eastern. S. J. Granfield, G5BQ, St. Luke's. 47 Warren Road. Cambridge. Region 6.-South Central. L. W. Lewis, G8ML. 34 Cleevelands Avenue, Cheltenham. Gloucestershire. Region 7.-London. P. A. Thorogood. G4KO. 35 Gibbs Green, Edgware. Middlesex. Region 8.-South Eastern. Norman D. Mattock, G2DFG. "Brackstories," 185 Cheriton Road, Folkestone, Kent. Region 9.-South Western. R. E. Griffin. G5UH. 13 Alexandra Road, Uplands, Bristol 3. Region I0.-South Wales. C. H. Parsons, GW8NP. 90 Maesycoed Road. Heath, Cardiff, Glamorgan. Region I 1.-North Wales. J. E. Thornton Lawrence. GW3JGA. "Perranporth." East Avenue, Bryn Newydd, Prestaryn. Flintshire. Region 12.-North-East Scotland. G. B. Woflinden, GM3COV, 5 Rockwell Crescent, Thurso, Caithness. Region 13.-South-East Scotland. G. P. Millar. GM3UM. 8 Plewlands Gardens. Edinburgh 10. Region 14.- West Scotland. D. W. R. Macadie, GM6MD. 154 Kingsacre Road. Glasgow, S.4, Region 1S.-Northern Ireland, J. William Douglas, G131WD, 21 Wellington Gardens, Bangor, Co. Down. Region I6.-East Anglia. P. J. Naish. G3EIX. 6 Mildmays. Danbury. Chelmsford, Essex. Region 17.-Southern. L H. F Southwell,A MS, 15 Hollybank Road, Hythe. Southampton. Hants.

,ii111111111111111111111111111111111111!i: '!I'!' I ' 1 1'1 iHr:11!IIMIKIIIININIIIIMIIIIIIIIIIIrlinfill111111111111111111111111111111111111111111111111111ffillliiiiiiiiiiilligniiiiiiiiillMinitillillinniilliiiiIIIIIIIIIIIII111111111111111111111i11111111111111111111111iiiiiiiialliiiliglinve

QSL BU REA U M A N AGER

A. O. Milne, GSM I, 29 Kechill Gardena, Bromley, Kent

RSGB BULLETIN JUNE, 1965 363 Mosley 3mC fo metre opera

Mosley has designed the most outstanding three element array for 20 metres on the market today. This clean- line aerial will give you that DX punch that will over- SPECIFICATIONS AND PERFORMANCE DATA: ride QRM. This aerial has a new anti-flutter design which GAIN ( 8 db.) (FIB 24 db.) virtually eliminates element flutter and boom vibration. HANDLES MAXIMUM LEGAL POWER BOOM LENGTH 24 It. The A-203-C is a wide spaced, gamma matched, full size MAXIMUM ELEMENT LENGTH 37 ft. TURNING RADIUS 22 IL beam, built with swaged tubing elements for extra duro- WIND LOAD (80 mph wind)-140 lbs. ASSEMBLED WEIGHT 40 tbs. ability. This antenna will approach the performance of

1106••0•• 1106••0•• SHIPPING WEIGHT 49 /12 tbs. many four to six element beams without the headaches of large size and weight necessary for these large beams.

NE W RV-4 Vertical. 10. 15, 20 and 40 metres. requires no radials. V-4-6 Vertical, 10, 15, 20 and 40 metres. V-3 Jr. Vertical, 10, 15 and 20 metres. VTD-Jr. Vertical. 10, 15 and 20 metres. For chimney or pole mounting. TW-3X. El Toro. Vertical. 20. 40 and 80 metres, requires no radials. TA-3I Jr. Vertical or Horizontal Dipole. 10, 15 and 20 metres. Self-supporting from centre. 700 watts p.e.p. s.s.b. TD-3 Jr. Trap wire Dipole. 10, 15 and 20 or 40 metres. D-4BC. Base loading Coil for 80 metres with V-4-6. MA-3. Mobile Whip. 10. IS and 20 metres. SWL-7. Receiving Dipole kit. 11, 13, 16, 19, 25, 31 and 49 metres. RD-5. Receiving Dipole kit. 10, IS, 20. 40 and 80 metres. Beams TA-33, TA-32, TA-36. 2 kw. p.e.p. s.s.b. 10, 15, and 20 metres. TA-33 Jr. TA-32 Jr. 700 watts p.e.p. s.s.b. 10, 15 and 20 metres. A-203-C. A-310. A-3I5. A-210. A-2I5. Single band power beams. 10, 15 or 20 metres. A-I42. 14 Element 2 Metre Beam. Transmitter. Mosley Commando 11 s.s.b. 180 watts p.e.p. New styling. New Polystyrene Rope. 4-ton breaking strain, for supporting beams. etc. ML-6 no breaking-up of guy ropes now necessary. All Antenna accessories, Rotators, Coax, Wire, Towers etc. We are the Antenna people

40, Valley Road, New Costessey, Norwich, Norfolk, Nor. 26K

364 RSGB BULLETIN JUNE, 1965 SUBSCRIPTIONS

NA EMBERS are well aware of the effect on their personal finances of recent increases in the cost of services and goods, and the Society has been no less affected. Since 1957, with the great help provided by the surplus on the sales of publications, the Society has succeeded in balancing its accounts. This year, however, many Items are rising in cost for reasons entirely outside our control, e.g. Postage, Rates, National Insurance, Rent, Printing, Wages and Paper are only a few of the basic items affected. During past months there has been an extensive search for a new Headquarters, so far without success, and on the expiry of our old lease new terms were offered to us by the Ministry of Public Building and Works which is now the Society's landlord. Under the new lease there is a rise for rent and services from £550 to £1,320 p.a., and, following the national trend, the Society's annual general rate has risen from £220 to £287. Postage charges are a major burden. Most services of the Society will be affected considerably by the increases which came into effect on May 17: general correspondence and publications, the QSL Bureau and the BULLETIN. The increase in the cost of postage on the BULLETIN in a full year is no less than £700. Printing is the major item in the Society's budget. At the present time the Industry is faced with increases in cost which could well put up the Society's bill for printing by as much as 18 per cent, in the next few months, in addition to the 5 per cent. rise last January. The next increase is expected to apply to all work after June 1, 1965. The results of the negotiations now going on cannot be foretold but it is considered that the figures quoted below are realistic. The rises in costs we have mentioned are completely outside the control of th 3 Society but other expenses will also continue to rise; for example, Headquarters correspondence. Salaries and wages must also increase if we are to maintain a capable staff. The figures below give an estimate of the increased costs with which the Society will be faced during the coming year and are based either on known facts or on a realistic estimate provided by our Printers and Accountants.

£ Rent and services 770 Rates ...... 67 Electricity and gas 10 Cleaning ...... 108 Salaries, wages, pensions, cost of living increases, merit rises and possible additional staff ...... 1,250 Telephone ...... 50 General postages ...... 250 QSL Bureau postages ... 60 General printing and stationery 100 Audit fees (as agreed at the AG M) 20

BULLETIN: Printing, paper, blocks and drawings 3,088 Copyright fees ...... 200 Postage ... 700 £3,988

TOTAL ESTIMATED INCREASES £6,673

It is our carefully considered opinion, that, in the light of the above figures, the annual subscription for Corporate Members should be raised to 50,'-, and that for Associate Members to 25/-. The Council of the Society has accepted this advice and the new subscription rates will come into effect on July 1, 1965. The membership subscriptions fall due evenly throughout the year and therefore in the first year only half the increased revenue will be received. Therefore, for a Corporate membership of 12,000 the increased revenue will be £9,000 in a full year but only £4,500 for the year ending June 30, 1966. Looking ahead two years, and assuming no further increases in costs in the printing industry and no more increases in Rates, Postages and similar expenses, the deficiency for two years would be £13,346. In this period the increases in subscriptions will total £13,500. The surplus in the 1964 accounts of about £1,000 must be kept as a reserve. It is intended that with the solvency of the Society assured for the time being, full services to Members will be maintained and the BULLETIN will continue to be improved in content and presentation. NOR M AN CA WS, F.C.A., Honorary Treasurer ROY STEVENS, Executive Vice-President

RSGB BULLETIN JUNE, 1965 365 News from Headquarters

Mobile Operation Prof. Martin Ryle, G3CY, Honoured Many enquiries have been received from members regard- Professor Martin Ryle, Director of the Mullard Radio ing the implications of a proposal by the Ministry of Trans- Astronomy Observatory at Cambridge, has been awarded port to amend the Motor Vehicles (Construction and Use) the Henry Draper Medal of the United States National Regulations to forbid the driver of a motor vehicle to Academy of Sciences for outstanding achievement in astro- " speak into any radio transmitting equipment." nomical physics. The award was made on April 26 in As soon as the Minister's proposal was made known the Washington, D.C., during the 102nd Annual Meeting of the Society took the matter up at the highest possible level. As a Academy. result, representatives of the Societ, will he attending a Professor Ryle was an early investigator of the discrete meeting with Ministry officials shortly. sources of radio emission in the sky, the existence of which was just becoming established in the period immediately following World War II. Headquarters Fund—List No. 26 It was to a crowded meeting of RSGB members held at The following are additions to the list of those who have the Institution of Electrical Engineers in 1948 that Martin contributed to the fund: Ryle gave one of the first public lectures in the British Isles S. J. Coe, G3FCT: C. J. W. Thomson, G3PEM; H. Parker, on the then new science of Radio Astronomy. Since that VS9PJV; E. Shackleton, G6SN; D. A. Jones, ZLIA0J: time Professor Ryle has become world-famous for his E. A. Lomax, BRS1579; J. Barton, A2737; A. J. Mathews. researches at Cambridge. Members who attended the RSGB G6QM; F. J. Biggerstaff, BRS22277; R. H. Roling. National Convention at Cambridge during 1960 will remem- GW6WM; Dr. A. Liftig, KIIXG; Mitcham and District ber that Professor Ryle, who has held the call G3CY since 1938, personally conducted the several parties of visitors who Radio Society. Total amount collected to date: £2,049 17s. 4d. toured the Mullard Radio Astronomy Observatory on that occasion. Professor Ryle is a Fellow of the Royal Society, winning DL2 QSL Bureau the Hughes Medal of the Society in 1954. He is also a Fellow The DL2 section of the RSGB QSL Bureau had been taken of the Royal Astronomical Society and won the Gold Medal over by Cpl. C. Thomas, DL2CT, Box I25A. RAF Butz- of that Society last year. weilerhof, BFPO 19. Mr. G. D. Griffith, DL20X/G3P0X. The Henry Draper Medal, established in honour of an who has been responsible for the Bureau for the last three eminent American astronomer and Academy member by his years, is returning to the UK. widow in 1883, was last awarded in 1962. Professor Ryle became the 350th recipient. RSGB QSL Bureau The address of Mr P. R. Cox, G3RYV, QSL Bureau Sub- RAE Course Manager for call-signs in the series G3UAA-G3UZZ. is now A course for the Radio Amateurs' Examination will begin 38 Ridgway Crescent, Tonbridge, Kent. in September at the Evening Institute, Farlingaye School, The new postage rates are 4d for up to 2 oz. and 2d for Woodbridge, Suffolk. Further information may be obtained each additional 2 oz. from the Head of the Institute, Mr. A. R. Spicer.

" Home Brew" The accent of the special feature on the stage of the Sey- Staff Vacancy at Headquarters mour Hall, London, at the 1965 RSGB International Radio Communications Exhibition is to be Home Brew." There is a vacancy for an enthus- In previous years it has proved difficult to do justice to the iastic radio amateur with a good many outstanding examples of Home Built Equipment entered for the various contests, due to lack of space. This com mand of English to join Head- year, however, with the accent on " Home Brew" the many quarters staff. The work will be pieces of equipment are to be given the place of honour on concerned principally with the RSGB the stage where they will be seen to the best advantage. BULLETIN but there will be ample In order to provide a first class display it is essential that there be a large entry of high standard for the various con- opportunity to gain experience in the tests. Some of the awards are as follows: Horace Freeman production of the Society's many other Trophy, Exhibition Organiser's Plaque, "Other Regions publications for the amateur. Awards," Special Award for " Amateur" Amateurs, Junior Constructors Award. Details of these contests will he given Applications, giving details of educa- in a later issue of the BULLETIN, but now is the time to start tion and previous experience (if any), building that new piece of equipment, or finish off the one should be addressed to the you already have on the stocks. Your Exhibition Committee asks you for a maximum General Manager, effort in making this special feature a great success, and to Radio Society of Great Britain, show the world that the British Amateur is in the forefront 28 Little Russell Street, when it comes to home-constructed equipment. Make a start now—it may bring you a valuable prize, but London, W.C.1. it will certainly bring you that special satisfaction which pertains to a" Home-Brew" effort.

366 RSGB BULLETIN JUNE, 1965 TRANSEQUATORIAL RADIO PROPAGATION DURING THE YEARS OF THE QUIET SUN An Amateur IQSY Projeri

By R. C. CRACKNELL, ZE2JV, and R. A. WHITING, ZC4WR

GROUP of amateurs located at various points between lower than for normal multi-hop F layer propagation. The A Dundee in the North and Capetown in the South have morphology of the h.d. regions after dark is even more been actively engaged in transmitting and recording signals fascinating, as these regions split up into blobs or columns across the Equator on frequencies between 29 and 50 Mc/s. of extra high density ionizations, disappearing after midnight Observations, which started in September 1963 and were to re-appear in the early morning hours as high altitude planned to continue through the current minimum of sun- layers of ionizations capable of channelling signals along the spot activity through which we are now passing, have been lines of the earth's magnetic field in a similar manner to centered around two beacon transmitters. The first was v.l.f. dawn chorus whistlers [6]. operated by ZC4WR from his home in Limassol, Cyprus These phenomena make a particularly interesting study. with a power of 25 watts into a vertical aerial on a frequency as position of the vertical sun, sunspot cycle and diurnal of 29,008 kc/s, and the other operated under a special variations in the morphology of the tropical ionosphere licence, ZEIAZC on 50.046 kc/s, is situated on a magnificent affect the symmetry, and relative densities of the h.d. regions, 1,000 ft. hilltop some 23 miles north of Salisbury, Rhodesia. and have fully occupied the Amateur activities of the writers, ZC4WR's beacon transmission, which was regrettably and many of their Amateur friends, since the two first ran closed down by Cyprus Government order in September. schedules as VQ4RA W and G2AHU respectively. 1964, was propagated into Southern Africa with a regularity that surprises the experts, and over the period it was oper- Historical Note ated was continually monitored at Salisbury (ZE2JV), Early exploitation of this mode on 50 Mc/s was well Bulawayo (ZEI AN), Sasolburg, Orange Free State (ZS4SA) recorded in the BULLETIN and the achievements of G6DH's and Worcester, Cape Province (ZS1LA). historic QS0s with the late ZS1T and ZSIP are well Perhaps nobody other than ZC4WR and ZE2JV, who worth recalling, as were many reports from G5K W operating since 1958 have together specialized in transequatorial as MD5KW from the Suez Canal zone during the 1947/48 v.h.f. propagation [I, 2] would have dreamed of trying long sunspot maximum. The following extract from the log of distance 50 Mc/s tests during sunspot minimum, and neither VQ2PL (now ZE7JX) is typical of what t.e.p. can provide: of them expected more than an occasional opening of the " 18.11.47. 50 Mc/s. MD5K W. 5-7/5-7. We started at 19.00 much favoured Cyprus-Rhodesia path [3], over which as and carried on until midnight... . " late as 1962. propagation at 72 and 84 Mc/s had been Ironically, Southern Rhodesian stations were not licensed recorded [4]. However, since ZE1AZC went into con- to use 50 Mc/s until I949—more or less at the same time that tinuous operation in April, 1964, many reports have been British stations lost the band—but ZE2JV well remembers received from BRS26325 in Dundee over the period June- the 1948 BERU contest, when it was possible to work Gs September 1964, from W4JQB and WA4AGF on June 30/ on 28 Mc/s right through the contest all night and all day as July 1, and DE-A-00544 in Bad Godesburg, Germany on well. The night time signals had that peculiar flutter-fade- September 9, 1964. These exceeded the most optimistic auroral-type sound that later became so familiar on t.e.p. expectations and indicate that the transequatorial mode signals. (t.e.p.) has still not been fully appreciated. The 50 Mc/s DX was then forgotten; dismissed by all observers as a freak occurrence of the years of the highest The T.E.P. Mode sunspot count up until that time. However, soaring sunspot Most of us know from our own operating experience and numbers in 1957 prompted many of the same gang to dig from elementary Handbook theory [5] that the upper layers transmitters out of the garden sheds and search for the of the ionosphere (F region) tend to be denser over the forgotten ubiquitous RF26s. The stories of yet higher Equator than over the Poles. It should be expected that sunspots than ever recorded before and world wide 50 Mc/s minimum ionization would occur over the magnetic poles and DX are too well published to bear repetition here [3] and maximum along the line of zero magnetic dip (which we call. the ARRL Propagation Research Project was a commend- not strictly accurately perhaps, the Geomagnetic Equator). able international effort in which amateurs in many In fact, however, this is an over-simplification, and instead of countries, including Britain, co-operated. the maximum we find a bite-out in ionization over the G.M. Across the Equator signals on unbelievably high fre- Equator, and the rolling back of the maxima into two high quencies were observed at ZE2JV, 87 Mc/s f.m. from Israel. density zones in the regions lying 10°-15* to the north and and 70 Mc/s police signals from Cyprus. Up turned a school south of the G.M. Equator. friend G8IP as ZC4IP, and of course ZC4WR. and the Since these high density regions typically develop electron 28/50 Mc/s game was on. Night after night, sometimes densities three to four times greater than experienced else- nearly all night: " 50 Mc/s Rhodesia-Cyprus more regular where, stations so situated to take advantage of them can than a telephone line, elephants can't knock it down," we employ frequencies nearly twice as high as could stations quipped. Signals were analyzed photographically, timed [7] elsewhere. And this is not the full story. If stations are and the long QS0s gave way to automatically keyed trans- situated so that they are symmetrically positioned with missions that continued through the IGY and after. At respect to these h.d, regions, signals can bounce like a least three modes of transmission paths were identified, each billiard ball off each in turn without intermediate ground with its characteristic time delay and fading pattern, and it reflection. In this case the wave requires less refraction and was shown that at times these took place simultaneously hence an even higher frequency is usable and attenuation giving signals difficult to decipher.

RSGB BULLETIN JUNE, 1965 367 The Reliability of the Limassol/Salisbury T.E. Circuit on shown up by ZEIAZC in 1964 were never suspected at the 29.008 Melt • time. Perhaps of even greater significance in pointing to the Histograms showing percentage of operational days signals received in reliability of t.c.p. was that ZC4WR's 28/29 Mc/s trans- Salisbury. Southern Rhodesia. from Limassol, Cyprus, on a monthly basis. missions almost every evening from 1958 to 1962 showed an too, SEPT 1963 110 — MARCH 1964 over-all reliability of nearly 99 per cent, mostly on phone, and his transmitter ran 15 watts to a long wire aerial. This was the background which prompted us to take a look at what the t.e.p. circuit could do when sunspot counts were low.

Results: September I963-September 1964 Although observations of the signals radiated by the 29 I 10 12 14 16 16 20 I 10 12 14 16 11 20 GMT Mc/s beacon transmitter were made at several places in Southern Africa. the principal path considered is the one to Salisbury. At ZE2JV's QTH automatic recording equipment 1.10 OCT .63 was installed to record signal levels and such recordings were continuous throughout the observational period from September 1963. The operating times of the beacon were SI 07.00-19.30 GMT at weekends, and 14.30-19.30 GMT on weekdays. These times were chosen to fit in with amateur operating practice and to provide further data on the previously noted anomalous behaviour of the i.e. circuit I 10 12 14 16 16 20 11 10 12 14 16 II 20 after sunset. In view of the early morning propagation GM( GPI anomalies revealed by ZE1AZC's 24-hour operation on 50 Mc/s, the beacon, reactivated as ZC4WR. now operates continuously. In interpreting the results presented here the original operating times of the beacon should be borne in mind. The reliability of the Limassol/Salisbury and other paths exceeded all expectations in view of the lack of solar activity. To give some idea of the distances involved the Limassol/ Salisbury path is 3,400 miles long and would be a normal O 10 12 14 16 16 26 1 10 12 14 16 11 20 2P circuit. The reliability of this path is well illustrated by 6MI 6M1 the series of histograms (Fig. 1) covering nearly a year's observations and far exceeds that predicted by conventional 100 DEC '63 methods of calculating the m.u.f. In fact, as can be seen, 10m contacts were possible throughout the year between the two locations and except for one month were possible never SO less than five days out of ten during operational hours. The histograms show too the seasonal variation in circuit behaviour, influenced by the sun's position relative to equatorial regions. The circuit was most reliable at the I 10 12 If. 16 Ill 29 11 10 12 Vi 16 18 20 equinoxes and least reliable at the solstices. This seasonal ONT pattern was observed on all paths and has been observed in la preceding, years on the higher frequencies as well. In 100 JAN 1964 100 JULY '64 particular, it is interesting to note that circuit reliability was highest just after the September equinox and slightly before the March equinox, i.e., when the sub-solar point is south 50 SO The Reliability of the Sa.volbureLimassol T.E. Circuit on 29 ,008 Mc/s Histograms showing percentage of operational days' signals received in Sasolburg from Limassol on a monthly basis. I 10 12 14 10 II 20 I 10 12 It 16 11 20 6 MT GMT 110 JAN 1964 100 MARCH 1964

loo FEB '64 110 AUG '64 so 50

SO 51

I 10 12 14 16 It 20 1 10 12 If. 16 II 20 6 NI 6NT 1 II 11 12 14 16 11 20 I 10 12 14 16 14 29 6 14 1 6M1 100 FEB 1964 100 APRIL 1954 During 1957/60 50 Mc/s QS0s with all parts of North America were commonplace from Rhodesia, and many so so reports on the automatic transmissions arrived from the Northern hemisphere from California in the West to near Japan in the East, and especially from F9BG and G4LX (Newcastle). However, transmissions only took place on 0 10 12 V. 16 1 20 11 10 12 14 11 11 21 restricted schedules and some of the oddities of propagation ONT ONT

368 RSGB BULLETIN JUNE, 1965 Average Diurnal Signal Level Jr the Limassol/Salisbury T.E. behaviour after sunset did not manifest itself to any great Circuit on 29.008 Mc/s extent in 1964 and at present it would seem that this phenomenon is a function of sunspot number. MA RCH 1964 9— The path to Bulawayo (ZEIAN), 200 miles south of

'4' 7 — Salisbury, followed the same general pattern of reliability. However, except for the equinoctial months this circuit = 5 — tended to be best between one and two hours later in the day 1" - than at Salisbury. This was truc also of the circuits still E21111102 1 further south. At Sasolburg (ZS4SA), Orange Free State, 1 1 i I I 1 I I 1 1 the beacon was monitored regularly during the period 10 12 12 16 10 12 14 16 18 20 6M1 14 January to April, 1964. The reliability of this circuit is summarized in the series of histograms (Fig. 2). On the average this circuit was about 50 per cent less reliable than OCT '53 APRIL '64 9 — 5 — the Limassol/Salisbury circuit, although the same general propagation pattern is evident in the histograms for both circuits. The average diurnal signal level graphs (Fig. 3) give an indication of signal levels encountered on the Salisbury path reported on the usual amateur reporting scale. These results 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10 12 11, 16 18 20 I 10 12 14 16 10 20 are qualitative rather than quantitative, although the signal 6141 0/4 1 levels reported at Bulawayo were much the same. In examining them it is worth remembering that the signal NOV '63 MAY '64 source in Limassol had a power output of 25 watts to a 0.6À vertical aerial mounted 20 ft. above street level on the roof of a block of flats in downtown Limassol. Hence it is evident that the results achieved are well within the capabili- ties of low power amateur equipment. They serve as illustration too of the low path loss encountered over the ! I I I I T 1 I trans-equatorial circuits. 10 12 14 16 is 20 IO 121!.1 61 7 é )0 In the main the signal levels followed the same hourly 1 14 1 GMT pattern as the circuit reliability, i.e., during the periods when the circuits were most reliable, signals were at their strong- 9— DEC '63 9 — JUN E '64 est: an indication that during these periods the m.u.f. was close to the beacon operating frequency. Generally, the signals received at Sasolburg (ZS4SA) and Worcester (ZS1LA), Cape Province, were about 2 to 3 S units weaker than the signals received in Bulawayo and Salisbury: SOLSTICE 1 — 1- indicative of an increase in path loss of between 8 and 15db I 1 1 1 1 1 I I 21 on the longer circuits. The increased path loss is possibly due 8 10 12 12 1 6 181 20 10 12 14 16 II0 6141 CHI to another hop and if this is so then the ionosphere south of Rhodesia was capable of supporting propagation on 29 Mc/s.

JAN 1964 JULY '64 Again the diurnal signal level graphs for the months of - September and October show the anomalous propagation r - phenomena after sunset, peculiar to the transequatorial 5 6- circuit, when both signal levels and reliability increased. 7.2 3_ This was a familiar pattern in precceding years of higher sunspot activity and in the past it was found that the highest 1 — 1 1 1 1 1 1 frequencies were propagated after ground sunset time over I 10 It IT. 16 18 20 8 10 12 14 16 18 20 the Salisbury/Limassol path. After the March equinox there 6 M 1 014I is evidence of an early morning peak in signal levels, but the post sunset rise in signal strength is no longer in evidence. AUG '64 9 — In previous years about 50 per cent of the signals propagated 0«. 7— over the transequatorial circuit after ground sunset time displayed a form of flutter fading, similar to that displayed À" 5 — by auroral propagated signals. However, with the decline in 3- post sunset activity, flutter fading has been less and less in 1 — evidence and it is probable that these two phenomena are T T 1 I I I 1 I I I l i i i linked with each other and influenced by the decline in 8 10 12 14 Ib 11 20 10 12 li 16 II II 141 6141 sunspot numbers. During the months of January through to April the Salisbury Police transmissions on 40-15 Mc/s were monitored of the Equator. The circuit was least reliable during the in Limassol. The Police were aware of this and recordings December solstice. The June solstice brought indications of of their signals were sent to them for their information. anomalous early morning propagation as can be seen from During March. the best month, they were received on the the histogram for this month. Also during this month there average on four days out of ten around 12.00 GMT and two were reports of early morning reception of ZE1AZC days out of ten around 17.00 GMT. These are the two peak (Salisbury) on 50 Mc/s in Dundee, Scotland. The post- times for the transequatorial circuit. Because of the sporadic sunset openings, which were a feature of the te. path when nature of these transmissions the results obtained give little the sunspots were more frequent have gradually declined. indication of circuit performance but they do show how high The histograms show that during September, October and the transequatorial circuit m.u.f. rose with low sunspot November, 1963, the circuit was open for not less than seven activity. It is interesting to note that during March they days out of ten at 18.00 hours GMT, but this anomalous were receivable after sunset. On the only occasion that

RSGB BULLETIN JUNE, 1965 369

a Summary of Reception Reports of".50 Mc/s Beacon lengths become usable, but Transmitter, ZEJAZC, Salisbury, Rhodesia between Cyprus and Rhodesia equinoctial conditions bring the highest m.u.f.'s and re- Observer QTH Date Time (GMT) RST Remarks liability. It is possible that t.e.p. 5B4WR Cyprus 27.3.64 17.20/17.50 227 Flutter fading conditions extend as far north WA4AGE USA 30.6.64 00.00 57 as Scotland (the Geomagnetic W4JQB USA 1.7.64 00.39/00.44 ? Equator on a great circle path from Britain lies well to the D. Douglas Dundee. 2.7.64 05.00/05.05 226 Rapid fading north of the Geographic Scotland 10.7.64 05.12/05.18 338 Moderate fading Equator) and this is especially 18.8.64 21.30/21.48 469/348 Pings at 4min intervals interesting for amateur exploit- DE-A-00544 Germany 9.9.64 02.12/02.44 48 ation as it has a variety and complexity that is always in- D. Douglas Dundee. 13.9.64 05.30/05.36 S6 Slow fading triguing, together with the Scotland 14.9.64 04.28/04.36 SS Slow fading ability to transmit low power S2 Rapid fading 19.9.64 21.32/21.49 signals over long distances 20.9.64 21.00/21.06 S3 Rapid fading 21.9.64 00.10/00.16 S2 Rapid fading with little attenuation. It is 24.9.64 21.10/21.12 S4 predicted with considerable 26.9.64 06.00/06.09 Si Slow fading confidence that 70 Mc/s propa- 27.9.64 05.32/05.36 S4 Rapid fading gation from Britain to ZE, 1.11.64 22.32/22.46 229 Rapid fading ZS, CR6 and CR7 will be 2.11.64 23.50/23.58 349 High noise level possible when sunspot numbers 13.11.64 05.10/05.12 339 rise again. 20.11.64 21.40/21.50 229 The value of beacon trans- 2.12.64 23.30/23.35 339 Iligh noise level mitters in radio propagation studies has been proved beyond question, and much thought ZE1AZC on 50.008 Mc/s was received in Limassol it was and development has gone into the design and the type of received around 17.30 hours GMT, again in March, 1964. transmission employed. ZE I AZC is a small transmitter built It should be noted, however, that monitoring on 50 Mc/s in right into the aerial itself, producing 40 watts f.s.k., coded Limassol was carried out only occasionally. for recorders, into its ground plane aerial. Built by ZSI LA ZEIAZC has been received at several locations: in Europe, and erected by ZE3JJ and ZE2JV it has operated continu- USA and Scotland. The most consistent reporter was the ously without maintenance since its installation in March, Dundee observer. The reports are summarized in Fig. 4, 1964. and they provide a good deal of food for thought as they T.e.p. has been mainly an Amateur discovery, and the underline several unsuspected possibilities of the transe- team work which has gone into its development is of the type quatorial circuit. However, because of the intermittent that should in some measure justify the continued allocation nature of these reports it is not possible to draw any definite of frequencies for amateur use, and has been, to quote Ed conclusions. At certain times the Dundee observer noticed Tilton, V.H.F. Editor or QST [8], "One of the finest flutter fading on the received signals which he compared examples of Amateur Radio's potential for worthwhile with the fading effects noticed on signals propagated via the contributions to wave-propagation knowledge." aurora. It should be noted too that all the reception times arc for when darkness prevailed at the beacon location. The REFERENCES times of reception are generally late evening, around mid- [11 " How Does T.E. Work?" by R. A. Whiting. QST, night and early morning when related to the sending end of April 1953. the transequmorial circuit. Reception is reported at both an [2] "The Transequatorial Propagation of Very High equinoctial and a solstice period although in general stronger Frequencies," by R. Cracknell. QST, December 1959. signals were receivable at the September equinox. It is. of [3] " Night Time Equatorial Propagation at 50 Mc/s," A course, possible that two modes of propagation are involved Survey of ARRL—PRP. by P. Southworth. (1960.) here and that this is not just straightforward transequatorial [4] HRB Singer Inc., "Results of T.E.P. 32-87 Mc/s propagation. More data is required and more observers are Project," conducted by ZE2JV, ZC4WR, VQ5FS, needed. TT8AD and others. (1961-1962.) It has now been established that throughout the sunspot [5] RSGB Amateur Radio Handbook, Third Edition. cycle the transequatorial propagation path can be worked [6] Halliwell and Morgan, "Atmospheric Whistlers." using higher frequencies than previously anticipated. Proc. IRE, Vol. 47, pp. 200. Sporadically, frequencies as high as 90 Mc/s have been usable [71 "More on Transequatorial Propagation." Technical on t.e. paths of between 3500 and 5000 miles. Correspondence. QST, April 1960. M.u.f.'s vary appreciably with the seasons, and as the [8] " T.E. Propagation—V.H.F. Discovery Extraordinary," high density zones vary in density, so paths of different by Ed Tilton. QST, April 1965.

Brief Bulletins The Institution of Electrical and Electronics Technician beyond since the beginning of the space age is 258. Flight Engineers Limited is the name approved by the Board of International calculates the Soviet total—up to the end of Trade for the new engineering body which is being estab- 1964—as 90. Nearly 150 objects of all kinds—satellites, last lished by the Association of Supervisory Electrical Engineers stage rockets and the like—are still orbiting the earth. The with the support of the Institution of Electrical Engineers. US space agency (NASA) has about 50 scientific satellites in What's up there? According to President Johnson's report to space-2I of them sending signals back to earth. Both Congress on space activities, delivered January 27, 1965, the Anglo-American satellites arc still transmitting and the number of American satellites sent into earth orbit and second one, Ariel 2, continues to provide useful data.

370 RSGB BULLETIN JUNE, 1965 containing the switching arm, and the size of the switching arm itself. Full dimensions are given, and while these are CO-AXIAL RELAYS' expressed in millimetres, they may be converted into inches By H. J. DOHLUS, DJ3QG by use of the following formula: Inches = where x is 254 the dimension given in millimetres. 1 N most v.h.f. and u.h.f. installations, co-axial cable is One particular feature of the relays is their good crosstalk employed for the transfer of r.f. power from the trans- damping level, and this is of special interest in receiving mitter to the aerial, and from the aerial to the receiving systems employing high conductance frame grid triodes system. For rapid changeover of the aerial between the which can be quite easily damaged by excessive r.f. leakage receive and transmit modes, a relay is required which, during transmission periods. Specific information on the ideally, has been specifically designed to function with this crosstalk level is given later. type of cable. These arc known as co-axial relays. The form of the relay is such that it can be mechanically Co-axial relays are constructed so that they exhibit a linked to other contact sets and so be built up into a complete characteristic impedance which matches that of the co-axial master control unit. When giving thought to such an cable with which they have to work. When the impedance arrangement, however, the possible need to arrange sequen- of the relay and that of the cable arc identical, no mismatch tial switching should be remembered, and as will be seen, this is related to the r.f power that the co-axial relay is expected to carry.

Mechanical Description (a) Fig. I shows the cross section through the relay. Three co-axial sockets (3) (4) are fitted to a rectangular (c) brass block which has been drilled out both horizontally and TO RECEIVER SOCKET 1 vertically to produce a cross-shaped cavity. Socket 3 (4) which is fitted to the right-hand end, carries a spring switching strip fitted with double contacts, these being positioned precisely in line with the stubs on sockets 1 and 2 (3). The stubs of sockets I and 2 (3) are fitted with contacts and these will mate with those on the spring arm. TO AERIAL The spring strip attached to socket 3 (4) is formed so that . SOCKET 3 it is normally in contact with the stub of socket I. Pressure on the actuating rod (6) will move the spring strip from its 11 rest position in contact with socket I, over to the contact on socket 2. The actuating rod (6) is powered by the solenoid (5) and its associated plunger. The extent of the movement of the plunger/actuating rod is shown as (h) on the drawing. A second actuating rod (I I) may be fitted opposite the primary actuating rod (6). This allows switching of other contact strips (10) which may be built on to the co-axial relay unit and employed for control switching purposes. -J After the position of the spring switching strip, and the •. contact separation (a) have been adjusted, the front of the SOCKET 2 brass block (I) is closed by fitting the cover (2), and the leads TO TRANSMITTER from the solenoid terminated on the connecting block (7).

Design Impedance (b) Co-axial cable usually employed has an impedance of either 52 ohms. 60 ohms or 75 ohms. For the reasons already covered, the characteristic impedance of the relay, sockets and cable should all be the same, and this means that the relay must be designed to operate with the particular cable Fig. I. (a) A sectional view of the coaxial relay. version (A). (b) An alternative arrangement to enable the German DIN 47291 concerned in respect of its quoted impedance. The section coaxial sockets to be employed (8). (c) An additional elevation showing the method of mounting the plunger retaining loop 9 point will be introduced into the transmission line to degrade z r o the standing wave ratio and produce reflections in the feed VERSION(mm) system. In practice, absolute perfection in matching is (n) (mm) (un) rarely, if ever, attained, due in the main to the fact that the 52 6.7 e A impedance quoted for co-axial cable is normally a nominal figure. and subject to some variation. 60 5.9 e A Several types of low-loss co-axial relays have been 8 A described in LIKW and these have led to the development of 75 4.6 the relay to be detailed in this article. 52 8-0 9-5 e The relay to be described may be constructed for co-axial line impedances of 52 ohms, 60 ohms or 75 ohms, the 60 7-0 9-5 e impedance being determined by the dimensions of the cavity 4 W= 60-In 2 4). 75 5•5 9-5 8 • (852) Erlangen, Gleiwitzerstrasse 45, Germany. where sc< D t Adapted front an article in LIKIIWkridee, March 1963, published by the Austrian Society, osterreichischer Versuchsscnderverbund. Pig. 2. Conductor dimensions for different impedances.

RSGB BULLETIN JUNE, 1965 371 of an asymmetrical h.f. con- . ductor corresponding to the n.) r—D,--1 relay is shown in Fig. 2. The flat spring strip of 75 width (f) and thickness (s) lies centrally in the circular conductor, this being formed by the horizontal bore through 70 LIlI r—D11 the block (1). The characteristic impedance Z with air f2 dielectric (K = I) can be cal- zo_ 604712- 6 ;f22 (n.) culated from the formula 65 given in Fig. 2, or derived from f i the graphs of Fig. 3. The Zo 60.1n2 ip-i• (A) dimensions required to produce specific impedances arc given in the table associated 60 with Fig. 2.

Co-axial Sockets Two versions of the relay 55 are illustrated, but they are only different insofar as the type of co-axial socket is concerned. Both versions A and 50 i B can be made to suit the re- 1 0 09 08 0.7 0.6 05 04 03 02 0 I quired impedance. The normal American h.f. co-axial sockets with a square Fig. 3. The characteristic impedance of a tond having circular or rectangular cross-section, mounting flange have, on their assuming an air dielectric (K I). mounting side, one or more cylindrical steps. This means that the relay body (I) has to ticularly is this so in the case of the socket identified as (4) be counter-bored accordingly. As the dimensions of these in Fig. I. steps differ according to the manufacturer, the dimensions Suitable sockets meeting the DIN 47281 specification are of the counterbore will have to be adjusted according to the as follows: exact type of socket employed. For this reason no specific Type List No. Impedance size is given. What is particularly important is that the end 3-5/9-5 BN 4171 60 ohms of the socket's outer conductor makes good electrical contact 4.1/9.5 BN 9812 50 ohms with the base of the counterbored hole. 15/9-5 BN 5845 75 ohms In version A. which employs American sockets, the following type numbers are suitable: Type 15/9-5 is compensated and meets all requirements up to 3000 Mc/s, as do the alternative impedance versions. JAN Series JAN Type No. Impedance Construction VHF SO-239 50 ohms It has been mentioned that two versions of the relay are UHF SO-239(A) 50 ohms shown, the differences being accounted for by the physical N UG-58A/U 50 ohms construction of the co-axial sockets employed. UG-568/U 50 ohms Some simplification of the construction when American- type sockets are employed can be secured by ignoring the The characteristics and insulation of these sockets are as stepped shoulders on these sockets. In this event the dia- follows: SO-239 uses compressed mica dielectric, and is meter of the cavity bore is made constant from one end of suitable for frequencies up to 200 Mc/s; SO-239A employs the block to the other. That is, the diameter (b) on the left- Teflon (p.t.f.e.) insulation and may be used on frequencies hand side of the section A-B is increased to the same as that up to 500 Mc/s. This particular socket is not waterproof, of (c) on the right-hand side (Fig. 5). and neither type should be operated in excess of 500 volts. Making this bore a constant 9-5mm throughout its length will clear the shoulders of the American sockets. If this The N series is rated for use on frequencies up to 10,000 course is adopted, the impedance of the relay is adjusted by Mc/s, but in practice is not generally used above 3000 correct selection of the size of the switching arm. This will Mc/s. The insulation may either be Teflon or polystyrene be found in the table associated with Fig. 2, the first three according to the manufacturer. They are waterproof and can lines of which should now be ignored. handle up to 1500 volts, and may be obtained for 70-ohms Ideally, the main cavity containing the switching arm impedance. The C series has the same characteristics and should be drilled about 0-2mm undersize, and then finished is available in 50-ohms or 70-ohms impedance. with a reamer. The final surface must be smooth and free Connectors are available for matching and interconnecting from burrs, particularly at the intersections with cross one series with another. drilled holes. In version 13, only sockets meeting the German specifica- The hole (e) which accommodates the actuating rod tion DIN 47281 are employed. These have a flat base— should not exceed 3-2mm in diameter, and if it is required without the circular flanges of the American type—and this that the co-axial relay shall operate other contact sets makes construction somewhat simpler since the relay body driven by the same energizing system, then this hole should does not have to be counterbored. Great care must, how- be drilled right through the block. ever, be taken when fitting these sockets to ensure that the The main cavity bore housing the switching arm should stub is precisely central to the bore of the relay block. Par- will be silver plated.

3n RSGB BULLETIN JUNE, 1965 3 dio 144 -30 -31 base, and this has to be increased to 3.2mm in order to _I_ • accommodate the 3mm actuating rod. If it is made larger + than 3.2mm, the performance of the solenoid will be affected. Prior to plating the main cavity, the solenoid should be or 25.5 secured to the main block, and the alignment of the drilling 27 5 20 30 (SEE TEXT) of the base of the solenoid to that of the hole in the block which accommodates the actuating arm, checked. Any adjustments that are found to be required should be made 4)- before the cavity is plated. After assembling the relay and checking the contacts, the LA- 20 — •1 wire loop (9) Fig. 9, is soldered to the magnet frame as PLASTIC (TROLITUL 4 HOLES 3.2mm DIA SPRING COUNTERSUNK FOR /43 OR SIMILAR) shown in Fig. I (c) to prevent the plunger falling out of its CONTACTS housing. 3mm BRASS SHEET ROD ITE M 2 ITEM 6 ITEM 4b or 4d The rod (6) shown in Fig. 4(b) and in Fig. I. should be 25.5mm long, but if the solenoid is mounted on an angle (a) (b) piece (8) in Fig. I and Fig. 10, instead of being secured Fig. 4. The relay body end plate, the plastic actuating rod, and the directly to the main body of the block, it will have to he in- method of assembling the spring contacts. creased to 27.5mm. The rod is made from 3mm diameter The solenoid is secured to the body of the relay by two polystyrene stock, as is that for coupling in other contact countersunk brass screws which pass right through the body sets if they are fitted (I I). of the relay block, and this is illustrated in section X-Y in Fig. 5, the screws being designated M3. Assembly The solenoid specified has only a very small hole in its Fig. 6 provides details of the manner in which the contact

Ae/ 0SK FOR M3 • «.-- —1 1 3.2 dia r r-9-1 G

SECTION X-Y M3 SECTION C 2 D M35mm deep 5mm deep Y D 59 DRILL RIGHT THROUGH IF REQUIRED e 71

M3 e Srnm deep

SECTION A- 5mm deep I SEE TEXT M3 DIMENSIONS ARE IN MILLIMETRES

DIMN VERSION VERSION Ml-6 mm 'A' '8' o 18.25 19.0 6 8.0 a 9.5 • C 16-0 • 9-5 • d 3.5-9.5 • 0 • VERSION 'B' PART SECTION A - 8 • e >3.2 • >3.2 • 73 HOLES FOR RELAY CONTROL SWITCHES AS REQUIRED

Fig. 5. Item I—the relay body component parts.

RSGB BULLETIN JUNE, 1965 373 3.5 w that the rivetting has been correctly done, soldering will not ! r- be necessary. Finally, a small radius is filed on each corner _ of the spring strip adjacent to the contacts. Before soldering either the spring arm or the contacts to the sockets, a plug should be mated with the socket con- approx 2.1 cerned. Under the heat of soldering, the insulation may well dia DIMS VERSION VERSION soften and cause displacement of the centre conductor, and (mm) 'A' '5 . the plug will assist in retaining this conductor in its correct Q position. 55 53 Fig. 7 shows how the contacts are fitted to the sockets See Fig 2/3 identified as (3) in Fig. I. The smooth contact rivet (3b) is inserted in the end of the socket's inner conductor, clamped, Part 4 b 4r.1 and then lightly soldered all round, taking care that no solder reaches the contact surface.

Fig 6. The switch spring strip dimensions. ITEM 9 LOOP 14 swg COPPER WIRE is fitted to the spring arm, while Fig. 4(c) illustrates how the BENT TO SHAPE AS SHOWN contacts are prepared prior to being fitted. The shaft of one of the contact rivets is removed, and the back then filed flat. This rivet is then drilled centrally with a hole equal to the diameter of the shaft of the other rivet. A sandwich is made consisting of the stemmed rivet passing Fig. 9. The plunger retaining loop—item 9. through the spring arm —previously drilled to take the stem Prior to fitting the contact spring switch arm, the end opposite to that carrying the contact set should be provided with a small slot—using a coping saw—of sufficient size to accept the centre spigot. A small jig, made from wire, should be devised to hold the co-axial socket and the spring arm in their correctly related positions while the soldering is under- taken. Without such an arrangement it will be very difficult to position the spring centrally to the spigot on the socket. After the spring arm has been fitted to the socket, but before the socket is fitted to the body of the relay, a small set SOLDER SOLDER should be made in the spring arm so that it deviates by about Fig. 7. Versions A and 8 of the coaxial sockets (3). with contact 4mm, see Fig. 8, centre illustration. This will produce a rivet fitted. contact pressure of about 50 grams, which is correct. Once the relay has been assembled, it is checked for con- as shown in Fig. 4(c)—and the drillcd rivet head slipped over tact pressure and contact register. The unenergized" the stem. The shaft which protrudes through the drilled position should present no difficulty since this is determined contact head is marked at about 0-3mm proud of the dome of the head and carefully cut at this point. The shaft is now dressed back with a light hammer until a hemispherical head Smm dia 3.2mm dia is produced with the spring strip firmly clamped. Provided

IS 5.5

m»...xere.. COUNTERSUNK FOR M3 le ITEM 8 ANGLE NOT REQUIRED IF DRILLED AS SECTION X- Y ON ITEM 4 14 -30 SECTION A - Fig. 10. The U-support for the solenoid. This item is not required if the solenoid is mounted direct on the relay body.

by the angle of the set placed in the arm. However, with the solenoid energized, the switching strip should not be bowed too far by the actuating rod (6). Adjusting the length of this rod will vary the contact pressure, and consequently the amount of" bow" in the switching strip. Finally, the cover (2) should be screwed into position.

Fig. 8. The switch strip can be soldered direct into the centre Measured Parameters conductor of either the A or /3 version sockets (4). With the relay terminated in a 60-ohms impedance, the

374 RSGB B U LLETIN JU NE, 1965 NEWS • • •

Collated by John Clarricgoats, 0.B.B., CHICL

Early Bird Earns Top Marks. The largest audience of all time, according to the world's press, participated in the pioneer public demonstration of Early Bird during the evening (in Western Europe) of Sunday. May 2, 1965. Those who marvelled most were those who appreciated most the immensity of the technical achievement—and to think it all happened because somewhere in space, 22,300 miles above the South Atlantic, off the east cost of Brazil, hovered a, small drum shaped device, of lampshade appearance—a mere 28 in. in diameter, 23 in. high and weighing only 85 lb.—the first commercial communications satellite. Well done Early Bird! SECAM Came First. After two weeks of technical discussion and a display of politics foreign to CCIR Study Group meetings the 200 delegates from 45 countries who met in Vienna failed to reach agreement on a standard international colour TV system for Europe. A majority (22) of nations voted for the French SECAM system but as the list of supporters included Cameroons, Gaboon, Mali, Monaco. Niger and Upper Volga little serious attention could be taken of the voting—political to a high degree. The German PAL system attracted 11 votes and the American NTSC system, backed by the United Kingdom, a bare six. As soon as it became apparent that agreement could not be reached the Postmaster General (Rt. Hon. Anthony Wedgwood Benn) informed Parliament that no date could yet be fixed A co•axial relay, version A. constructed by DJ3 QC. for the introduction of a colour TV service in Britain. Reading between the lines it seems possible that the UK may eventually adopt a modified version of PAL. following figures were obtained, the relay itself, of course, Pioneer Honoured. Mr S. R. Mullard, M.B.E., founder of having been designed for 60-ohms operation. the Company that bears his name has received the City and Frequency Reflected Power Crosstalk level Guilds of London Insignia Award in Technology. 145 Mc/s 0.1 per cent —40db Bit High for Amateurs at Present. An experimental milli- 435 Mc/s 0.7 per cent —32db metre-wave communication system is now transmitting 600 Mc/s 1.0 per cent —30db across Long Island Sound, New York—a distance of two 1000 Mc/s 4.0 per cent —23db miles—on a frequency of 90 Gc/s—one of the highest frequencies to be utilized so far for communication purposes. On 145 Mc/s and 435 Mc/s the relay proved itself capable The system shows considerable promise for future use in of handling more than 200 watts of r.f. power. Its perform- densely populated areas because of the large number of ance in this respect on higher frequencies has not so far channels which could operate in the same vicinity without been checked. interference. The link was established by General Tele- When switching appreciable r.f. power, it is not recom- phones & Electronics Laboratories. mended that this should be donc by the relay directly. Comsat Agreement. Forty-five count' ies have now signed a Rather, sequential switching should be employed, the power provisional agreement to establish a Global Commercial being applied after the switching action has taken place. Communications Satellite System, which, if all goes well, Failure to observe this requirement could lead to flash-over will operate from the end of 1967. and arcing with serious damage to the contact surfaces. German TV Booming. Although post-war TV is only about 12 years old in the North West part and even less in the Conclusion South and South West parts of the country, Germany now Although the illustrations may give the impression that ranks second only in Europe to the UK in respect of the full machine shop facilities are required to construct these number of viewers. The three German TV programmes are relays, such is not the case. True, reasonable facilities are broadcast by about 650 transmitters, converters and passive required, but provided great care is taken to keep all drilling relay systems to more than ten million subscribers. The square and accurate, no particular difficulties should be en- rapid development of German TV will be a special feature of countered. It should be borne in mind that a small local the Radio Products Fair to be held in Stuttgart from August engineering company may be prepared to undertake the 27 to September 5, 1965. drilling and reaming, or alternatively, a model maker or The Luck of the Irish. The Irish Radio Transmitters' Society instrument engineer may be persuaded to assist. decided three years ago to abolish their Trustee Fund and to invest the proceeds in 14 Prize Bonds. Recently one of the Bonds came up with a £100 win. Radio Astronomies and TV. For some time the Milliard Webbs Radio Log Book Radio Observatory at Cambridge, under the direction of The Society has taken over the log book previously Professor Martin Ryle, G3CY. has been making observations published by Webbs Radio and copies are obtainable from using frequencies in Channel 6 (176.25-179.75 Mc/s). One RSGB Headquarters, price 6s. 3d. post paid. Bulk supplies series of observations is concerned with a vitally important are available to the trade on the usual terms. (Continue on page 386)

RSGB BULLETIN JUNE, 1965 375 Rssociates conducted 139 rr does appear that progress towards using our great hobby interest. Unlike a lumped tuned circuit an aerial will tune or 1 as a central activity in boys' clubs has been very slow. resonate at a number of frequencies at the same time. This I cannot say that 1 know any Youth Centre or Club with an is because of its distributed inductance and capacity, the active station and radio construction room which is regularly lowest frequency of resonance is that which makes the aerial used by the lads. Also, I have not been able to raise, even one half wave long. A quarter wave aerial is also resonant with your help, a posse of Amateurs and other chaps with because of the reflected " image" in the ground (making a know-how who might form a nucleus of leadership upon half wavelength). This is how ground-plane aerials work. which to draw. All this is something odd in the electronic If you cannot get a half wave length of wire up (or a quarter and scientific age in which we live. Your keen interests wave plus a good earth), then it is possible to deceive the (those members who drop a line to " QUA. ...") is in con- shorter wire into resonance by placing lumped extra tuning trast to this. It is fine to read of endeavours carried out. But (loading coils) in circuit. Hence mobile whips have loading most activity is of an isolated type: one experimenter or coils and " capacity hats." But it is worth tuning any short listener, with, strangely enough, little " communication " wire to resonance, because the gain and sensitivity goes up. between each person, as it were. What have we discussed Once the energy is flowing in the aerial it must be fed to the here in the past year? There was an " A" members' meeting receiver. This requires the techniques of matching. The called about a year ago. With hundreds of young mem bers impedance looking into the receiver terminais should be the in the London area, about six came along. Then a camp or weekend course was mentioned, but only two or so responded. Plenty has been said about clubs for boys, but nothing has been done. Do you think that young people are already believers in the - don't get involved" doctrine common these days? Perhaps your scribe has always been involved with groups on some project or another, and is biased (positively, 1 hope!). I have a suspicion that an attack outside the ranks of our Society might be the only way to press forward with these plans. New converts are always the most enthusiastic, and if made in a group or club—they tend to (b) become the most loyal too. Fig. L (a) The symbols for a lumped tuned circuit. (b) The actual I hope you will liase with me. and try to raise chats. state of affairs along an aerial wire. demonstrations and meetings in your area for other young VOLTAGE CURRENT people's groups, such as the local Youth Clubs, Scouts, WAVE Boys Brigade groups etc. And remember, our hobby isn't WAVE 1/4 just sitting by a CR100, etc., listening, but developing tech- WAVELENGTH niques, building, studying, helping out with radio control projects, electronic devices, Radio Astronomy and other natural radio signal observations. I say this because from the majority of your letters the effects of modern and technical HALF education seem to be producing a deeper interest in the WAVELENGTH / GROUND // technical side; physics is often mentioned, so is maths! RF ENERGY But, herein lies a slight danger, for these subjects can be IMAGE surprisingly impersonal and may explain the weak social abilities mentioned earlier. Always the techniques are means, (a) it is the other fellow who is the end. Al Fig. 2. (a) The half.wave aerial, or dipole, is well known, but the From encouragement in letters from you, the " technical quarter wave vertical aerial is really a half-wave type with the snippet " form of short article is popular, and the technical lower half a" mirror Image" of the upper (b). paragraph in " QUA...." will reflect this by using an old AERIAL technique in writing, namely working through the alphabet CAPACITY with short discussions on topics under each letter. Many HAT items must be left out of course, but let's see what can be covered. So we start with—A. TO A is for: L LOADING RECEIVER ses COIL Aerial This should be the first resonant circuit in your receiving 1 or transmitting system. The secret of success with an aerial \,,r FEED is to have it out in the open intercepting the strongest r.f. field possible, and tuned to resonate at the frequency of '? (a) (b) Fig. 3. (a) The usual methods of bringing an aerial to resonance, especially for low frequency band mobile use. (b) A 7 circuit which • K. L. Smith. G3JIX, 82 Granville Road, Waltharnstow, London. E.17. is com monly used to " match " impedances.

376 RSGB B ULLETIN JU NE, 1965 same as that offered by the aerial. When these two are equal transformer coupled. push-pull stages, pre-amplifiers, voltage maximum power is coupled into the receiver. This is where and current amplifiers, power amplifiers, and many others. the " aerial tuning" unit (properly called aerial matching As usual, the field is wide, but the principles are relatively unit) comes in. simple.

Amplifier Your Communications Network; Letters this Month The whole of radio and electronics developed because A couple of letters from new members of the Society open devices were discovered that gave the possibility of producing this month's news and views. We extend a welcome to Dave large powerful signals from tiny weak ones. The vital point Dade, A4500. who lives in Bromley, Kent. Dave says, is that the output is a true replica of the input. In other " . .. and I would like to say how pleasant it is to find such a words, the output is always proportional to the input, and friendly atmosphere among Radio Amateurs. - I'm sure we all agree with that, and extend it ourselves to younger beginners. Also to Peter Osborn, A4364, who has an ancient " 5V5 communications receiver, and uses it on 160, ifs OUTPUT 80 and 20m. Peter doesn't mention the aerial he uses at his Il QTH in St. Albans. The 0TH often makes as much difference to reception as a change of receiver, of course. Fig. 4. The symbol representing an amplifier. Paul Gaskell, A403S, writes a sizeable note again. The receiver now in use is an HRO, and the 50ft. aerial is to be the ratio of this output to the input is greater than 1, and is replaced by a 40m dipole soon. But Paul says that many known as the gain. All ordinary practical amplifiers fall lads at school are not prepared to co-operate in a project, short of these ideals; thus the output may not be a truc or that they cash in afterwards—a " something for nothing - replica of the input. This is called distortion. The amplifier attitude in fact (all this came up from G3RKK's comments in usually introduces random signals of its own such as noise a previous "QUA...."). I assured Paul that I have no truck and hum, which limit the smallness of the input that can be with those attitudes! Again it is the service to others and the handled, whatever the gain. It is the "signal ro noise ratio" movement which is important. There is no substitute to that is important. Most amplifiers have a limited frequency making friends, because co-operative relationships do not response. This means that although they are designed to produce selfish attitudes but just the opposite. amplify a.c. signals, they do not have the same gain at all George Fettes, A4076, writes for the first time. There frequencies. Many have no gain at all for zero frequency were a number of suggestions in George's letter, and obvi- (d.c.) and hardly any at very high frequencies. The mid- ously the more of these, the merrier for future tech, topics in frequency range in between these two drop offs is known as " QUA...." (with acknowledgements to Pat Hawker, the bandwidth. Some amplifiers are designed to amplify d.c. '3VA!). George also says that studying for the RAE is a bit signals, but the great plague of the d.c. amplifier is drift, difficult, with all his other commitments, one of which is his which means the output d.c. level varies slowly with time, work as a Cub Scouter (very good work is possible here. because of random changes in mains voltages, temperature what say, George?). Concerning the studies, perhaps corres- and so on. ponding with one or two other" RAE swotters " might help? Other amplifiers are deliberately made to have a iwrrow (George is in Glasgow.) band response. They usually have tuned circuits in the A. M. Fletcher, A3994, hails from Aylesbury, Bucks. He circuit, and are most commonly found in receivers as r.f. and says that he had a few replies concerning the note in last i.f. stages. These types are also known as selective amplifiers. January's " QUA Associates." Perhaps other readers may Once the idea of amplification is understood, then many like to write to A3994 also. In the letter was an aerial design other radio circuits are covered. An oscillator is an amplifier and comments on circuitry; mainly transistor techniques. supplying its own input signal. The circuit continuously A hint was also dropped that tape correspondence would be produces an output for no external input, and we say it is very welcome (3, in. per sec., two track). A3994's address is oscillating. If a wide-band amplifier is used, the oscillations 60 Cottesloc Road, Aylesbury, Bucks. are at many frequencies all at the same time, and the device There is good news from Andrew Wheele, A4267. He is usually called a relaxation oscillator, an example of which wrote to me saying that a group of lads have got together is the nuthivibrator. If a narrow band or tuned amplifier is in Welwyn and formed a club. This group is named the used, then the output is at one frequency. Such an oscillator Rollswood Boys' Society, and in fact, a visit was made by is the Hartley, for example. Another, common in amateur these keen lads to the HQ of the Roding Boys' Society. transmitters is known as the Clapp circuit. Given half a Close links will no doubt be forged between these two groups. chance, ordinary amplifiers will " go off" and oscillate even so may we wish all the best to this, the first pioneering boys' when not required to do so. All that is needed is a small club to set up activities similar to the original aims of the fraction of the large output signal to get back into the early RBS (Wanstead). part of the circuit. This brings the problem of stability to Once again we sign off, so to all lads everywhere in the the attention of the experimenter or designer. Many circuits RSGB, this is JIX wishing you 73 for this month. exist: valve and transistor, resistance-capacity coupled.

OUTPUT Swedish Summer Camp The Malmoe Amateur Radio Club has extended an invitation to British amateurs to attend a summer camp in South Sweden from July 3 to 11. The site is a military camp beside the small lake Yddingen, 16 km from Malmoe. Accommodation is limited, but there is room for camping, PHASE CORRECTING NETWORK although sheets or sleeping bags are not provided. The cost is kr 12 per day per person. Further information may be Fig. 5. By applying feedback, which supplies a signal of the correct amplitude and " phase" (i.e., the right polarity) the amplifier obtained from Gunnar Silvén, SM7BJ, Mariecialsvâgen 35A, beco mes an oscillator. Malmoe V, Sweden.

RSGB BULLETIN JUNE, 1965 377 TO AERIAL ARRAY

A V.H.F. Beam IIf 1 PULLEY PI P3 P2 Rotator

By A. W. TOMALI N, G3PTB *

ROM conversations with numerous 2m operators, it is CROSS-ARM F apparent that quite a number of people are without H means of rotating the aerial system. Equally, there are many FLANGES highly sophisticated systems in use and an even larger number of unsatisfactory devices. G The system to be described was developed as a reasonably simple device which could be constructed by those possessing BALL- RACE only the " usual tools found in any amateur shack." The A basic idea sprung from the discovery that 2 in. alloy pole 2014 ALLOY TUBE of the scaffolding or heavy duty TV mast variety with a WITH THICK WALL wall thickness of ¡ in. would take a 14 in. pipe thread. COUNTER - WEIGHT 8 A local plumber was therefore prevailed upon to put about rrOIA ALLOY TUBE 2 in. of thread on one end of a 20 ft. 2 in. pole (A in Fig. 1), OIL -HOLE obtained from a scaffolding firm for £3 10s., taking care to HEARING IOURNAL ensure that the thread was square to the pipe. Two 14 in. pipe flanges (F) were bought (4s. 6d. each) having three ¡ in. BEARING BLOCK holes near the periphery. One was screwed tight onto the pole and any thread protruding through the flange trimmed off. 112.. OIA BALL E A visit to a local garage produced a second-hand but service- able ball-race (L) of inner diameter such that it was a drive- LOCATING SCREW fit on I in. alloy tube (believed to be a motorcycle main shaft — ORAIN HOLE bearing). A piece of I in. tube (B) was selected to be straight and true and carefully scraped (with a Skarsten-type scraper) until the ball-race could be carefully driven down the 1 in. Fig. I Sectional titer's of the rotating mechanisms for the mast. tube until it was about 3 ft. from one end. In one version the ball-race was warmed up to expand it so that it shrunk onto the tube as it cooled. The following operations will be described firstly as would hub from a bicycle front wheel. The spokes were removed be done by those having access to a lathe etc., and secondly leaving the axle and spoke flanges. The axle was adjusted for the benefit of those without. A piece (D) of brass bar until about 4 in. protruded from one side and then securely 2 in. long was turned down to be a slide fit inside the 2 in. lock-nutted into place. Three holes were then drilled radially tube. A in. hole was bored into one end for about 1 in., in the 2 in. tube, similar to holes K above, tapped 0 BA or leaving the drill-taper shape in the bottom of the hole. A BSW. The lower end of the I in. tube was force-fitted with ¡ in. hole (B) was then bored right through to act as a drain an oak plug which was then drilled to be a drive fit on the hole in the event of water getting in. bicycle axle which was then driven home. The I in. tube was A further piece of 1 in. stock was shaped as a bearing then lowered into place as before and three long bolts screwed journal (C) to be a drive fit in the lower end of the I in. tube into holes K so that they gripped the centre of the axle casing. and then reducing in diameter for about in. to be a slack A certain amount of adjustment on the bolts enabled the fit ( el in. undersize on diameter) in the hole in the bearing bearing to be centred in the 2 in. tube. This could be block D. A 8 in. drill was run into the small end of the improved by adding another set of centring bolts 14 in. below journal for about j in. to provide a location for the ¡ in. steel the first three. ball E (old bagatelle ball) which forms the lower bearing of A cross arm (H) of 1 in. x I in. x ¡ in. angle steel or full- the inner tube. A ¡ in. locating hole N was then drilled about size " Dexion" (the small-size material is not rigid enough) 3-4 ft. down from the top of the 2 in. tube. This hole was about 2 ft. long was drilled to locate on two of the holes either tapped suitably or a 4 in. long self tapping screw was in the top flange plate. The second flange was then put inserted. The bearing block D was liberally anointed with into place and, with the cross-bar, bolted home (bolts G) grease and pushed down from the top of the 2 in. tube until ensuring that the ball-race was centred on the 2 in. tube, it rested on the locating screw N. Three suitable holes (0 BA checked by seeing that the I in, tube revolved easily. or similar) were then drilled through the tube into the bearing Two 6 in. discs of I in. hardwood (preferably teak) were block, tapped and the securing screws K inserted. The steel cut out, either with a coping saw or fly-cutter, glued and ball was then dropped down into the centre hole. The pinned together. A hole was bored through the centre so that 1 in, tube, bearing the ball-race and with the bearing-journal the disc was a force fit on the I in. tube. Two 8 in. diameter fixed in place, was then inserted into the 2 in. tube such that discs of 18 s.w.g. aluminium or similar material were pinned the journal entered its socket in the bearing block. The to the wood discs to form the pulley P1 which was then initial position of the ball-race was determined by suitable positioned a few inches above the ball-ram Two long screws measurement and then moved about I ft. further away from were driven into radial holes in the pulley and into small holes the lower end of the 1 in. tube. With the rotating member in the 1 in. tube to anchor the pulley securely. Two shrouded in place the ball-race was tapped down until it rested on the pulleys P2 and P3 of the clothes-line variety were then flange of the 2 in. tube. bolted to the extremities of the cross arm such that the tops For those without access to a lathe, use was made of the of the pulleys were level with the centre of the large pulley. A suitable length of cord or plastic clothes line was then • Chapel Street, Barford, Norwich. Norfolk, NOR 38X (continued on page 4W

378 RSG B B ULLETIN JU N E, 1965 A DISTRIBUTIVE SURVEY OF AMATEUR RADIO IN THE BRITISH ISLES

By T. H. HOLBERT, GH3DXJ*

r is unfortunate but inevitable that a survey of the type place in the column quoting amateurs per square mile. As a Ipresented here is obsolescent before it is written. matter of interest approximate figures for the United States Obviously with the rate of the order of 3,000 alterations and arc: additions per annum. the 1965 edition of the RSGB Amateur Per head 11700. Per square mile 0.09. Radio Call/soak, the main source of information, is in part The numerical dominance of the G3 • 3 block, and post- already out of date. Therefore che figures quoted are only as war licences is evident in Table 2. It may be objected that the accurate as the Callhook. However, as an exercise, this survey G2 -t- 3 category is misplaced because the lull radiating facility was only granted post-war. However, the basic licence was a pre-war issue and permission to radiate was, after all, only an addition to the basic licence. In the case of El, due to the different system of allocating call-signs, only two groupings are possible. These are best termed " early " and " more recent." No doubt the IRTS has a more elegant system of classification than this, which is quite arbitrary. It is hoped that no hard feelings are aroused by such cavalier treatment and that showers of Irish confetti will not be thrown across St. George's Channel.

Survey by Counties The main purpose of the breakdown by counties of Great Britain given in Table 3 is to show the comparative G-DX value of each county. The table is based on the list of counties for RSGB Contests, which is shown in Table 10. A similar breakdown for the counties of Eire is given in Table 4. It will be seen that in Great Britain there are five listings

—amateurs serving overseas—

serves a useful purpose in that a general picture emerges which, for all practical purposes, is sufficiently topical to be used as a basis for comment. Other minor errors are unavoidable owing to Service amateurs living overseas, licensees withholding their addresses, and ambiguous addresses which complicate allocation of call-signs to specific counties, and even in a few cases to countries. Although every effort has been made to —should solve the holiday problem— ensure accuracy, the writer is human and fallible and must inevitably introduce minor errors in a task of this magnitude. (including Scill> ) where incumbents sit in solitary state, and After this somewhat apologetic start, however (the um- two available with vacant possession. This should solve the brella having been well and truly raised) let it be said that the holiday problem for the G-DX minded. accumulated error is only about 2 per cent. This, in a technology accustomed to the TABLE I acceptance of 20 per cent Summary of Licences in the British Isles. tolerance, is considered to be a reasonable figure. Prefix Cougar) Licences Population Per !lead Area Per Sq. Overall Information (1961) Sq. Miles Mile Table I shows the distribu- 1 GC Channel Is. 44 104.398 , 1930 75 0.58 tion of licensed amateurs by 2 GD Isle of Man /5 48.151 /2370 221 0.11 the countries of the British 3 G England 9692 43,430.972 /4480 50.874 0-19 Isles. No distinction has been 4 0W Wales 436 2.640.632 /6000 7466 0.06 made between the types of 5 GI N. Ireland 224 1,425.127 /6330 5237 0.04 licence issued. It will be noted 6 GM Scotland 700 5.178.490 /7430 30.405 0.23 that G moves into second 7 El Eire 223 2,814.703 /12.530 26,601 0.009 • 19 Thomson Drive, Currie. Totals British Isles 11,344 55,642.473 /4820 120.679 0.094 Midlothian.

RSGB BULLETIN JUNE, 1965 379 'TABLE 2 Analysis of Licences by Prefixes

Prefix G GC I GD I GI 1 GM G W Totals Prefix G GC l GD GI 1 GM G W Totals

Pre-war Licences Post-war Licences

G2 - 2 262 4 — 2 7 7 282 G3 t 3 7364 28 19 184 1 594 333 8522 G2 . 3 704 5 1 12 26 34 782 G6 -t 3 33 — — — 1 1 35 G3 1 2 273 I I 8 14 16 313 G8 + 3 61 — — — — 2 63 G4 193 I I 2 12 6 215 G5 285 I 1 7 13 12 319 Total 8598 G6 • 2 276 1 2 5 21 9 314 G8 2 241 3 — 4 12 16 276 EIx + I 125 EIx --t 2 98 Total 2501

TABLE 3 Analysià of Licences by Counties of Great Britain

County Licences Prefix County Licences Prefix Qt., 0(.70(D OLDOCD UOCDOe OC Q 1 Yorkshire 820 46 Denbigh 33 G W 2 Lancashire 797 47 Londonderry 30 GI 3 London P.D. 692 48 Isle of Man 25 GD 4 Kent 521 49 Angus 24 GM 5 Surrey 502 Flint 24 G W 6 Essex 478 50 Guernsey 22 GC 7 Warwick 468 Huntingdon 22 G 8 Hampshire 433 Pembroke 22 G W 9 Cheshire 407 51 Hereford 21 G 10 Middlesex 381 Jersey 21 GC II Stafford 311 52 Anglesey 7 G W 12 Sussex 295 53 Tyrone 6 GI 13 Somerset 291 54 Carmarthen 4 G W 14 Hertford 283 Moray 4 GM 15 Lincoln 203 55 Caithness 3 G M 16 Buckingham 95 0Qt., 0 00 0 0 0 Wigtown 3 GM 17 Glamorgan 86 56 Cardigan 1 G W 18 Nottingham 78 2 Dumfries I GM 19 Lanark 72 Q UOODLIU O 3 O QU 000 O 0 QQQ Westmorland 1 G 20 Berkshire 71 57 Dunbarton 0 GM Worcester 71 Shetland 0 GM 21 Leicester 61 58 Banff 9 GM 22 Durham 57 Inverness 9 GM 23 Derby 36 Perth 9 GM 24 Gloucester 27 West Lothian 9 GM 25 Northampton 16 59 Argyll 8 GM 26 Norfolk 15 Armagh 8 GI 27 Wiltshire 13 Ross & Cromarty 8 GM 28 Cornwall 09* 60 Clackmannanshire 7 GM 29 Dorset 05 Merioneth 7 G W 30 Bedford 00 Roxburgh 7 GM Northumberland 00 61 Orkney 6 GM 31 Devon 94 Radnor 6 G W 32 Suffolk 87 Rutland 6 G 33 Antrim 85 62 0 2 Brecknock 5 G W 34 Midlothian 79 0 0 0 30 63 East Lothian 4 GM 35 Down 77 Selkirk 4 GM 36 Cambridge 70 64 Bute 3 GM 37 Oxford 67 e Kirkcudbright 3 GM 38 Monmouth 66.1 65 Berwick 1 GM

Shropshire 66 2e 22 2 Fermanagh ' GI 39 Fife 61 Kincardi ne ' GM 40 Aberdeen 52 Nairn 2 GM 41 Ayr 51 66 Alderney I GC 42 Renfrew 45 Montgomery I G W 43 Stirling 40 Peebles I GM 44 Caernarvon 36 0 Sutherland I GM 45 Cumberland 35 67 Kinross it GM Sark II GC

• Includes 1 Isles of Scilly t Includes 10 G prefixes

380 RSGB BULLETIN JUNE, 1965 TABLE 4 TABLE 5 Analysis of Licences by Counties of Eire Licences per Head of Population in Selected Cities

County Ref. Licences City Licences Population Per Head

1 Dublin DU 101 1 Cambridge 50 94,810 1/1890 7 Cork CK 24 2 Norwich 52 119,650 1/2300 3 Donegal DO 18 3 Leicester 101 273.130 1/2730 4 Louth L H 10 4 Bristol 123 436,000 1/3500 Waterford WA 10 5 Manchester 156 660,300 1/4230 5 Limerick LI 6 6 Belfast 96 440,000 1/4570 Mayo MA 6 7 Cardiff 55 256,900 1/4670 West Meath W M 6 8 Brighton 33 161,190 1/4920 6 Kildare KD 5 9 Birmingham 226 1,110,290 1/5000 7 Galway GA 4 10 Newcastle 48 267,230 1/5570 Kerry KE 4 II Leeds 80 511,650 1/6390 Sligo SL 4 12 Liverpool 101 745,810 1/6400 8 Cavan CA 3 13 Edinburgh 70 474,060 1 /6770 Wicklow WI 3 14 Dublin 71 504,000 I /7200 9 Clare CL 2 15 Glasgow 118 1,056,000 1/9000 Leitrim LE 2 16 London 692 8,151,750 1/11,640 Tipperary TI 2 10 Longford LO I Monaghan MO I Offaly OF I TABLE 6 Wexford WE 1 II Carlow CW 0 Amateur Sound Mobile Licences Kilkenny KI 0 Laoighis LA o Roscommon RO 0 Prefix Mobiles Per Cern

1 G 1556 15 2 GI 33 14.7 3 GW 55 12.6 TABLE 7 4 GD 3 12-0 10.0 Amateur Sound Mobile Licences by Counties 5 GC 4 6 GM 54 8-5 Counties not listed have leu than 10 licences. Great Britain 1705 15

County Mobiles Prefix

Lancashire 132 G TABLE 8 2 Yorkshire 129 G 3 London P. D. 115 G Amateur Television Licences 4 Essex 85 G Warwick 85 G 5 Surrey 76 G London 18 6 Kent 72 G Warwick 15 7 Cheshire 70 G Lancashire 9 Somerset 52 G Surrey 9 Stafford 50 G Cheshire 9 7 9 Middlesex 46 G Essex 10 Hertford 45 G Middlesex 7 li Hampshire 43 G Stafford 7 70 Leicester 43 G Others (under 5 per county) 12 Sussex 38 Wales (GW) 8 13 Durham 35 G Scotland (G M ) 4 14 Lincoln 34 G N. Ireland (GI) 1 15 Worcester 32 G 16 Buckingham 28 G Total 165 17 Northampton 27 G 18 Nottingham 24 G 19 Derby 23 G 20 Glamorgan 22 GW TABLE 9 Gloucester 22 G 21 Norfolk 20 G Licences in the Zones of the Two Metre Band Plan 22 Devon 18 G Wiltshire 18 G 23 Berkshire 17 G Zone Licences Dorset 17 G 8 2134 Northumberland 17 G 5 2129 24 Antrim 16 GI 4 1318 25 Cornwall 15 9 1246 26 Bedford 14 G 6 1112 27 Shropshire 13 G 7 902 Suffolk 13 G 866 28 Cambridge 12 G 3 729 29 Lanark 10 GM 1 494

RSGB BULLETIN JUNE, 1965 381 It is realized that the information given in Tables 3 and 4 ad bedpan and all sorts of attractive figures could be pro- is not easily digestible, and that a tabular-type presentation duced to portray various other aspects of the hobby. The may not appeal to some Members. Thus the data has been only really useful one would be some sort of activity table, summarized and is shown on the map, Fig. I. The solid but this is quite out of the question. blocks in the counties around London and other principal centres of population emphasize in the main the concentra- Selected Cities tion of electrical and electronic industries. Surprisingly, One of the minor extravagances attempted is given in there arc plenty of G-DX prospects within easy reach of all Table 5 where certain selected cities are listed on a per head these densely populated areas. (Continued on page 386) TABLE 10 List of Counties for RSGB Contests

England (G)

1 Bedford BD 22 London (Postal ID 2 Berkshire BD District(s) 3 Bucks BS 23 Middlesex MX 4 Cambridge CE 24 Monmouth M H 5 Cheshire CH 25 Norfolk NK 6 Cornwall CL 26 Northampton Ni 7 Cumberland CD 27 Northumberland ND 8 Derby DV 29 Nottingham NM 9 Devon DM 29 Oxford OX 0 Dorset DT 30 Rutland RD 1 Durham DUI 31 Shropshire SE 2 Essex EX 32 Somerset ST 3 Gloucester GR 33 Stafford SD 4 Hampshire HE 34 Suffolk SF 5 Hereford HD 35 Surrey SY 6 Hertford 1-IT: 36 Sussex SX 7 Huntingdon 1-114 37 Warwickshire WK 8 Kent KT 38 Westmorland WD 9 Lancashire LE 39 Wiltshire WE — acquired a sp it personality — 20 Leicester LR 40 Worcestershire WR 21 Lincoln LN 41 Yorkshire YS The only oddity in the list is the county of Monmouth. Although politically an English county, at some time in the Scotland (GM) dim and distant past. Amateur Radio in Monmouth 42 Aberdeen AN 59 Lanark LK acquired a split personality in that either a G or GW prefix 43 Angus AS 60 Mid-Lothian MN may be requested. As the GW listings predominate by 5 to I, 44 Argyll AL 61 Moray MY the allegiance is apparent. Monmouth is therefore shown 45 Ayr AY 62 Nairn NN with Wales. The " foreigners" are requested to show stiff 46 Banff BF 63 Orkney OY upper lips. Belfast, a County Borough, also presented 47 Berwick BW 64 Peebles PB difficulty which has only been resolved by arbitrarily allocat- 48 Bute BU 65 Perth Pl-f ing its amateur population equally to Antrim and Down. 49 Caithness C1' 66 Renfrew R W Obviously this sort of statistical game can be played almost 50 Clackmannan CM 67 Ross &Cromarty RY 51 Dumbarton DU 68 Roxburgh RH 52 Dumfries DF 69 Selkirk SK 53 East Lothian EL 70 Shetland SL 54 Fife FE 71 Stirling SG 55 Inverness IS 72 Sutherland SU 56 Kincardine KE 73 West Lothian WN 57 Kinross KS 74 Wigtown WG 59 Kirkcudbright KB

Wales (GW)

75 Anglesey AG 81 Flint FT 76 Brecknock BR 82 Glamorgan ON 77 Cardigan CA 83 Merioncth M R 78 Carmarthen CR 84 Montgomery MG 79 Caernarvon CV 85 Pembroke PK 80 Denbigh DB 86 Radnor RN

Northern Ireland (GI)

87 Antrim AM 1 90 Fermanagh EH 88 Armagh Ali 91 Londonderry LY 89 Down DW 92 Tyrone TE

Channel Islands (GC)

93 Alderney AD 1 95 Jersey JY 94 Guernsey GY I 96 Sark SR

97 Isle of Man (GD) 1M — Glasgow's figure is slightly inflated--

382 RSGB BULLETIN JUNE. 1965 11111111111111

>7.9:555 etgee

Fig. I. Map showing the diatribution of Amateur Radio licences in the British Isles.

RSGB BULLETIN JUNE, 1965 383 on June 20. Talk-in on 144-779 Mc/s will be by G3TOQ and on 1915 kc/s by G3EJA. Windscreen stickers (which will Mobile Column assist parking) and further details are obtainable from N. C. Taylor, G3T0Q, 83 Stoneham Close, Tilehurst, Reading, By E. ARN OLD MATTHE WS, G3FZ W* Berks. Loughton and District RS is to hold its first full-scale rally OLLO WING the suggestion made in this column that at Loughton Hall, Rectory Lane, Loughton, Essex on F there should be information kiosks and lecturettes at Saturday, June 26. The site is in the Epping Forest area rallies we are taken to task most pleasantly by G3BID, who about 12 miles from London. There will be displays of asserts that much harm might be donc to Amateur Radio fencing, judo and archery; film shows; various competitions by trying to " sell " it to the general public with the aim of and sports for all members of the family in addition to the gaining recruits to the hobby. Referring to an article pub- usual exhibition of equipment, bargain sale, etc. In the lished under his name in the August 1963 issue of CQ evening there will be Old Time Dancing. Talk-in will be on Magazine he maintains that any country can support a 160m and 2m. Application has been made to the Post Office maximum 'number of amateurs and any increase will be to for the use of the call-sign GB3LOU for this station. the detriment of the hobby, and he holds up the state of the North Eastern Amateur Radio Mobile Rally. Organized by hobby in the US as a " horrible example." South Shields and District ARC, this event is to be held at However, aggressive salesmanship was the last thing in Bents Park Recreation Ground, Coast Road, South Shields, mind when we made the suggestions in February. The on July 11. The site is adjacent to a wide expanse of beach. lecturettes we had in mind were of a technical nature to Competitions include a concours d'elegance (which includes attract and interest radio amateurs. As for information tests of operation), a driving test, a transmitter test and a bureaux, who has not been met with the question from an novel quiz contest. Competitive games will be organized obviously puzzled stranger at any rally open to the general for jnr. ops. and XYLs. A prize will be awarded to the mobile public, " Excuse me, but what is this all about? ". There is a operator travelling the greatest distance to attend on the day world of difference between helping the genuinely enthusi- of the rally. Talk-in will be by G3DDI on 160m from il a.m.. astic newcomer, or answering the questions of the unknowing and another station will stand by on 145-8 Mc/s. public, and high pressure salesmanship. The former is good The fourth Bodensee-Treffen will be held in Konstanz on public relations work. June 26 and 27. There will be a D/F contest and a mobile rally in addition to a trade fair. At night there will be a An Interesting Suppression Problem dance in the 500 year old Council building, when prizes will From G3HZG (Redditch) comes a letter describing a cure be presented to competition and raffle winners. for some interference in his Ford " Cortina." It appears that the fuel and temperature gauges are supplied with power through a device which the manufacturers call a " voltage stabilizer." In fact, current flows through a coil wound round RSGB a light bi-metal strip inside the device and out via a contact M OBILE SAFETY RECOM MENDATIONS switch so that the current is interrupted for times propor- I. All equipment should be so constructed and tional to the voltage when the voltage rises above a certain installed that in the event of accident or sudden level. The gauges themselves are thermally operated and braking it cannot injure the occupants of the car. have a long time constant and are thus not affected by the breaks in supply of operating power in so far as their instan- 2. Mobile aerials should be soundly constructed, taneous reading goes. G3HZG found that the noise from taking into account flexing at speed and possible the device was sufficient to swamp an S7 signal. A le danger to other vehicles or pedestrians. The capacitor affected the switching rate considerably and so maximum height must not exceed 14 ft. above a TCC type TCB/PF universal motor suppressor was fitted ground. with complete success. This is, in fact, three capacitors in one 3. Wiring should not constitute a hazard, either elec- case, so that when connected, 0-07e was placed across the trical or mechanical, to driver or passengers. stabilizer's" terminals and 0.0025e to earth from each 4. All equipment should be adequately fused and a terminal. It might be possible to remove the device com- battery isolation switch is desirable. pletely from the circuit, but errors in gauge readings would 5. The transmit/receive switch should be within easy then be proportional to the square of the voltage. access of the operator and one changeover switch The writer wishes to thank Beacon Motors Ltd., of Bir- should perform all functions. mingham, for their help when he discussed the problem with them. 6. The microphone should be attached to the vehicle so that it does not impair the vision or movement Rally News of the driver. The Sligo and Leitrim Radio and Electronic Society is 7. A driver/operator should not use a hand micro- organizing a Harnfest for Whitsun weekend, June 5 and 6, phone or double headphone. and Whit Monday, June 7. Amongst the weekend activities 8. All major adjustments, e.g. band change by a driver/ will be an exhibition of home-constructed equipment, a D/F operator, should be carried out whilst the vehicle hunt, and a film show. A dinner will follow on Whit Monday is stationary. night at Kelly's Hotel, Sligo, Eire, at 7 p.m., the charge for 9. Essential equipment controls should be ade- which is £1 Is. An invitation has been extended to all Els, GIs. Gs, GMs, GWs etc., and their XYLs, to take part in quately illuminated during the hours of darkness. what promises to be a most enjoyable " Western " Whitsun 10. Logging must not be attempted by the driver Holiday. All enquiries should be addressed to M. Meldrum, whilst the vehicle is in motion. El5AH (ex-G3HNH), 21 Wolfe Tone Street, Sligo, or I I. All equipment must be switched off when fuelling B. Gilmurray, New Line, Manorhamilton, Co. Leitrim. and when in close proximity to petrol tanks. Reading ARS is holding a Mobile Picnic at the Childe 12. A suitable fire extinguisher should be carried and Beale Trust Pavilion, Lower Basildon, Pangbourne, Berks. be readily accessible.

• I Shortbulla Lane, Lichfield, Staffs.

384 RSGB BULLETIN JU NE, 1965 M OUILE RALLIES 1903

June 5, 6, 7 Sligo and Leitrim July 11 North-Eastern Mobile Rally, Ha mfest, Eire South Shields See page 385 See page 384 Organized by the Sligo and Leitrim Rodio and Electronic Society Organized by the South Shields and District Amateur Radio Club

June 6 RSGB National Mobile Rally July 11 Tenth Anniversary W ethersfield M obile Rally, Oxford See page 387 See page 387 Organized by the Rodio Society of Great Britain Organized in conjunction with the RSGB by the Oxford and District June 7 Saltash and District ARC Amateur Radio Society M obile Rally July 11 Torbay Mobile Rally See page 303. May, 1965 Organized by the Saltosh and District Amateur Radio Club Junior Leaders Regiment. Royal Signals, Denbury Camp. Newton Abbot, South Devon June 20 Hunstanton Bucket and This rally will take place regardless of the weather: Spade Party plenty of indoor entertainment will be provided. G3JEC Station Refreshment Rooms Car Park Refreshments will be available. A heated swim- ming pool is nearby. Further information may be obtained from C. E. We n. Cobgate. Moulton, Spalding. Lincs. G3N JA/A 1.880 Mc/s G3ANM/A ... 1980 kc/s: talk-in station G3PYZ ... 3.660 Mc/s talk-in G3LMG/A ... 70-25 Mc/s I stations June 20 Reading Mobile Picnic G3LMG/A 144.13 Mc/s See page 384 Organized by the Reading Amateur Rodio Club Organized by the Torbay Amateur Radio Society June 20 Saundersfoot Bucket and July 25 Cornish Mobile Rally Spade Party Newquay Regency Hall, Saundersfoot. Organized by the Cornish Radio Amateur Club An informal gathering for all mobile operators. TU. XYLs..Inr Ops and SWLs. A prize of CS will be awarded to the mobile op. who travels the August 15 Derby Mobile Rally furthest distance to the rally that day. Rykneld Schools. Derby Organized by the Pembrokeshire and District Rodio and Electronic Organized by the Derby and District Radio Society Club August 30 Peterborough M obile Rally June 26 Loughton M obile Rally See page 384 River Embankment, Peterborough Organized by the Loughton and District Rodio Society Organized by the Peterborough and District Amateur Radio Society

June 26, 27 Bodensee-Treffen, Inter- Septe mber 12 RSGB National national Radio A mateur M obile Rally M eeting Woburn Abbey. Bedfordshire See page 384 Organized by the RSGB Mobile Committee

June 27 Longleat Mobile Rally Septe mber 12 UBA International Longleat Park. on the Frome-Warminster Road. M obile Rally A362 See below This rally is held in the grounds of Longleat House, home of the Marquis of Bath. The house and Organized by the Brabant-Sud and Brabant-Sud Est Section of gardens are open to the public, and there are USA ample catering facilities. Several contenu. a treasure hunt, balloon race, electric maze, raffle, Septe mber 26 Harlo w M obile Rally etc,, will be held. Talk-in stations on 1.88 Mc/s, 4m and 2m from Magdalen Laver Village Hall. Magdalen Laver, 10 a.m. near Harlow Organized by the Bristol RSGB Group Organized by the Harlow and District Radio Society

Temporary DL licences are available, on production of following information: full name and address, station call- national licences, from DJI DR. sign, Belgian /M call-sign allotted, mode and band desired Further details may be obtained front the organizing (a.m./s.s.b., 3.5 or 144 Mc/s). committee at Konstanz 3. POB 3029. German Federal Luncheon is available on pre-payment of a further 50 fr. Republic. For accommodation, enquiries should go to per head, exclusive of wines. All remittances, including those Verkehrsverein Konstanz--Amateur-Meeting 1965, Kon- made by international postale mandate, should be made to stanz, German Federal Republic. Compte cheque postal No 21.53.20. "Ardennes Brabaneonnes" Rally. This international Applications for temporary /M licences should he made to event is being organized by the Brabant-Sud and Brabant-Sud M. le Directeur Général des Radiocommunications de Li Est branches of UBA, and is being held on September 12, PT1', 42 rue des Palais, Bruxelles 3, Belgium and requires a starting from Court St. Etienne (25 km S/E of Brussels. photostat of the applicant's British licence, in addition to between Wavre and Nivelles) and is open to any Belgian or full name and address, vehicle registration no.. date and other amateur holding a Belgian /M licence. duration (not exceeding one month) of the visit. This appli- Applications for entry (accompanied by entry fee of 100 cation must be made three weeks before arrival in Belgium. Belgian francs) must be made to Godon Marcel, 83 rue de Incidentally, we understand that a reciprocal arrangement l'Institut, Rixensart, Belgium, by August 31. giving the (rontinued on page 386)

RSGB BULLETIN JUNE, 1965 385 exists between Holland and Belgium so that temporary licences granted by either country can be validated in both. Distributive Survey of Amateur Radio (Continued from page 382) The Amateur Radio Mobile Society has been invited to participate in a Red Cross Event on Saturday, June 26. at of population basis. Glasgow's figure is slightly inflated due Melbourne Park, Chelmsford, organized by the Essex to certain ambiguities in postal addresses, but the degree of Branch of the British Red Cross Society. error has been reduced as much as possible. There will be adequate car-park, refreshment and toilet- Amateur Mobiles facilities and cover in the event of rain. The site will be well The distribution of mobile licences is shown in Table 6 sign-posted. There will be many attractions, including two by countries, and in Table 7 by counties. It would appear performances of a Pageant telling the story of the Red Cross, likely that some 40 call-signs are exclusively mobile since no with a cast of over 150 people and the commentary by address appears against the call in the main list! A few Michael Flanders; tombola with hundreds of valuable prizes; counties have remarkably high percentages of mobiles, for performances by a military band, pipe band and Scottish example Leicester 26 per cent and Durham 22 per cent. dancers; bingo; dancing; barbecue; baby and flower shows; There are three maritime mobiles, two G and one GI. demonstrations of Red Cross work at home and abroad; Army demonstrations of casualty evacuation in battle by Amateur Television helicopter. It must be a hard life on IT as is evident from Table 8. A 160-page handbook is available at 3s. Id., including However, there are other compensations and it seems postage, from Mrs. Sylvia Margolis, 95 Collinwood Gardens, unlikely that a DX rat-race will ever manifest itself. Clayhall, Ilford, Essex. Entry to the event is Is. for adults, 6d. for children; handbook holders will be admitted free of Two Metre Band Plan charge. All proceeds will go to the Red Cross. A map showing the Two Metre Band Plan is published at intervals in the BULLETIN. The total amateur occupancy of the zones is given in Table 9.

NE WS... (Continued from page 373) Special Events Stations sky survey of radio stars which will not be completed until During the annual reunion of the Royal Signals at Catterick Camp, the Headquarters Station of the Royal next year. Until other frequencies become available to the Signals Amateur Radio Society will be operating under us astronomers, new stations now broadcasting in Channel 6 special call-sign GB3RCS. The station will be on the air will be restricted to certain hours each day. Molniya I, the first Russian communications satellite, from 08.00 to 22.00 GMT on June 25, 26 and 27, mainly on launched on April 23, 1965, put up a star performance on 14 Mc/s. Other bands will be used whenever additional May Day when the traditional celebrations in Red Square, operators are available. A demonstration station with the call-sign G3T11-1/A will Moscow, were seen by viewers at distances up to 5000 miles. be operating on 160m and 20m during a Garden Party at MoIniya I has an orbit time of 11 hours 40 minutes. St. Thomas's Church, Garretts Green, Birmingham, on June Smaller and Smaller. A digital computer that can perform 25.000 instructions per second yet weighs no more than 26 12. QSLs may be sent direct to the operator, A. A. Bickers, lb. and measures only 31 in. x 104 in. X Ilk in. has been 192 Garretts Green Lane, Birmingham 26. developed by IBM for the US Navy, The new unit, used in On Saturday, June 26, GB3MAA (Marconi Apprentice aircraft to calculate the release point for bombs and missiles, Association) will be on 160m, 80m, 20m, 4m, and 2m during the annual gala day of the Marconi Company. The station, employs thin film circuits made by vacuum deposition. which will be active from 2 p.m. to 7 p.m., will be manned by Want an IOTA? Latest among the many awards available to G3RHU, G3RTF, G3TJK. G30CM and G3SXK. A the DX fraternity is the IOTA —Islands on the Air. G. Watts, 62 Belmore Road, Norwich, Norfolk will send a list special QSL card will be issued to confirm all contacts. of islands which count for the award and other information on receipt of a remittance for 2s. QST reviews Useful for NFD. The first two cylindrical television masts in RADIO DATA REFERENCE BOOK the UK, one at Winter Hill and the other on Emley Moor, " An excellent collection of curves, tables and charts have now reached their full heights of 1015 ft. and 1275 ft. for the radio engineer, designer and radio amateur. respectively. Erected by British Insulated Callender's Con- Accompanied with sufficient text to permit its effective struction Co. for E.M.I. Electronics Ltd., the Winter Hill use, the information in the book ranges from general formulas to step-by-step methods for TVE cure and mast will support aerials for both BBC and ITA. prevention. Space does not permit listing all of the arcas Milliard Film Meetings will be held in Scarborough (Royal covered but here arc just a few of the subjects contained Hotel) on June 14, Hull (Royal Station Hotel) on June 15, in the handbook: R.f. power amplifiers. Pi-network Blackburn (Town Hall, Regency Room) on June 23„ circuits, wide-band couplers, filters, antennas (resonant Coventry (Leofric Hotel) on June 28, Blackpool (Norbreck lengths of half-wave dipoles, V and rhombics. folded Hydro) on June 29, and Belfast (King George VI Youth dipoles, broadside arrays. Yagi arrays etc.), trans- Centre) on July 1. The talk at each meeting will be "Transis. mission lines, coaxial resonators, waveguide sizes, coil tor Topics" and the films to be shown are titled Thin-film winding, rectifier and voltage multiplier circuits, and lots and lots of charts and tables on such things as conversion Microcurrents and Electromagnetic Waves, Part IL Tickets factors, metric equivalents, properties of metals, re- can be obtained upon application to Mr Ian Nicholson, actance and resonance. At the end of the book are tables Films & Lectures Organization, Milliard House, Torrington for natural sines. cotangents and cosines, logarithms, and Place, London, W.C.1. square roots. The possessor of this book with its large Hollow Cable of a new type recently developed in Western amount of essential reference data will certainly save Germany operates at frequencies approaching the speed ol lengthy research through many volumes."---September, light. The cable will enable a million telephone calls or a 1964. Bound in blue linson buckram. Price 12/6 (by post in thousand television broadcasts to be transmitted simul- carton I4/-) taneously. Traditional cables can handle not more than about RSGB PUBLICATIONS 2,700 telephone calls or three television broadcasts at the 28 LITTLE RUSSELL STREET, LONDON, W .C.I. same time.

386 RSGB BULLETIN JUNE, 1965 V.H.F. Band Plans TENTH ANNIVERSARY MOBILE RALLY All v.h.f. operators are reminded of the British Isles Twt., Metre and Seventy Centimetre Band Plans, which are spon- SUNDAY, JULY II, 1965 sored by the Society. Observance of these plans will assist in DX working and in avoiding QRM to Service frequencies College of Technology, Headington, In the 144-145 Mcfs band. Oxford Talk-in stations will be in operation on 160m. Zone I 2 metres 70 cm. Area

80m, 4m and 2m. 1 1440-144-1 432-0-432-1 Cornwall, Devon. Somerset. 2 144-1-144-25 432-1-43125 Berkshire, Dorset, Hemp- It is hoped to have the following attractions: Morris shire,Wiltshire. Channel Isles. dancing, lecturettes, flints, raffle and lucky-dip, 3 14+25-144-5 43125-4315 Brecon, Cardiganshire, Car- marthenshire, Glamorgan- demonstrations, competitions, trade exhibitions and shire. Gloucestershire, Here- home built equipment. fordshire, Monmouthshire, Light refreshments, complete cover and car parking Pembrokeshire. Radnorshire, facilities in grounds will he available. Worcestershire. 4 14+5-144-7 432-5-432.7 Kent, Surrey. Sussex. 5 14+7-145.1 4317-433.1 Bedfordshire. Buckingham- Organized in conjunction with the RSGB by shire, Essex, Hertfordshire. the Oxford and District Radio Society London. Middlesex, 6 145-1-145.3 433-1-433-3 Cambridgeshire, Hunting- donshire, Leicestershire, Norfolk, Northamptonshire. Sir Edward Appleton Oxfordshire, Rutland, Suffolk. Another link between the Society and the pioneers of Warwickshire. 7 145.3-145-5 433-3-4315 Anglesey. Caernarvonshire. radio was broken last month when the death occurred of Cheshire, Denbighshire, Sir Edward Victor Appleton, G.B.E., K.C.B., Principal and. Flintshire, Merionethshire, Montgomeryshire, Shrop- Vice Chancellor of Edinburgh University. During the time shire. Staffordshire. Professor Appleton held the Wheatstone chair of Physics at • 145-5-145.8 433.5-433.8 Derbyshire, Lancashire, Kings College. London 0924-19361, he lectured several Lincolnshire, Nottingham- times to the Society on the propagation of radio waves and shire. Yorkshire. 9 145-8-146 433-8-434 All Scotland, Northern Ire- their reflection and refraction, in which field of research he land, Isle of Man, Cumberland, became world famous. In 1925 he provided experimental Co. Durham. Northumber- proof of the existence of the Heaviside-Kennelly (E) Layers land. Westmorland. using frequency-change techniques and later demonstrated the existence of the F layer which now bears his name. His Two Metre Band Guard Channels: The following frequencies researches were fundamental in the development of radar. in the 144-145 Mc/s portion of the 2-metre band are tabulated Sir Edward was secretary of DSIR during the early part of on the schedule to the Amateur (Sound) Licence to be the war. Since his appointment to Edinburgh University he avoided as they are allocated to Service use: 14443, 144.09, sat on numerous important Government committees and 144.18, 144.27, 144.36, 144-45, 144-54, 144.63, 144-72, 144.81 played a leading part in many scientific associations of an and 144.9 Mc/s. Remember! The safety of aircraft and human international character. lives depend upon the interference-free use of the channels.

RSGB National Mobile Rally United States Air Force Base, Wethersfield, near Braintree, Essex SUNDAY, JUNE 6, 1965

To be opened at II a.m. by Co!. Baer, Wing Commander of the USAF Base

Talk-in stations will be operating from 10 a.m. GB3RS on I .8 Mc/s; GB2VHF on 70 Mc/s and 144 Mc/s

The proposed programme includes: Grand raffle. exhibition stations, static aircraft display. RTTY display, fire-fighting display, Go-Karts. PT display, model airci aft demonstration, trade exhibition. RSGB bookstall, raffle for a DX40, baseball match, Civil Defence display. Laser demonstration, a tour of the control tower, and a children's lucky dip.

Refreshment stalls will be available, and there will be two acres under cover. Car parking facilities have been centralized.

Further infiwnuttion will he broadcast in GB2RS News Bulletins

Organized by the Rodio Society of Great Britain

RSGB BULLETIN JUNE, 1965 387 RAOTA REUNION Sir Albert Mumford Guest of Honour

CUR ALBERT MUMFORD, K.B.E., until recently early phone transmissions dating back to 1922, including a 13 Engineer-in-Chief of the Post Office and currently the talk which he gave from 2L0 on behalf of the Wireless Immediate Past President of the Institution of Electrical Society of London during 1923. Engineers, was guest of honour at the Seventh Annual In his account of the year's work the Founder-Secretary Reunion of the Radio Amateur Old Timers' Association (John Clarricoats, G6CL) reported that membership had held at The Horse Shoe Hotel, Tottenham Court Road, risen to 180—an increase of 23—and that five members London, on May 7, 1965. (G2FM, 5MM, 610, 6SC and 6UT) had become " Silent RSGB Past President Arthur Milne, G2MI—subject of Keys." The Benevolent Fund had provided assistance to the Profile in the May BULLETIN — Was in the Chair, sup- widow of one very old-timer and to several old-timers. ported by Past Presidents Ernest Gardiner, G6GR (1944- Christmas parcels had been sent to the widows of seven 46), Victor Desmond, G5VM (1948-49), Fred "Dud" members. A contact had been established with Mrs Anne Charman, B.E.M., G6CJ (1952) and Leslie Cooper, G5LC Simmonds, widow of the late pioneer DX-worker Ernest (1953). Vice-Presidents Bert Allen, G2UJ and Jimmy Simmonds, G20D, and as a result of the contact a wealth Matthews, G6LL, with Council Members Jim Foster, G2JF of unique historic information as well as many photographs and Louis Varney, G5RV, were also present. of G20D's famous station had been acquired. Introducing Sir Albert Mumford " as my recent boss," A suggestion received from one Provincial member that Arthur Milne spoke of Sir Albert's long association with the future reunions be held during the period of the RSGB Society and of the many services he had rendered to the Exhibition in November received no support from either the Society in the past. London or Provincial members present. Sir Albert reminisced in most entertaining style tracing back his interest in radio with the Post Office to the early Marcuse Memorial Fund days of the Dollis Hill Research Station, G5DH. In quipping For the second year in succession no entry had been mood he claimed to have experimented there with the single received for the Marcuse Memorial Prize. The Secretary side-band mode of transmission in 1927. He recalled develop- intimated that if no entry is received after publication of the ments at Leafield and Rugby and of visits paid to both rules in the December, 1965, RSGB BULLETIN the balance of stations and to Dollis Hill by RSGB members long before the Prize Fund, most of which had been donated by RAOTA the war. Sir Albert referred to the wartime efforts made members, would be transferred to the RAOTA Benevolent by the Society to prepare for peace by negotiating with the Fund. Post Office for the early return of licences. He spoke about the Atlantic City Radio Conference (1947) and revealed a New Honorary Member number of interesting facts about the Conference which had A proposal by the Secretary that Sir Albert Mumford not previously been mentioned at any gathering of radio be elected an Honorary Member of the Association met with amateurs. (Mr. Mumford, as he then was, attended the the unanimous approval of those present. Sir Albert Conference as deputy leader of the UK Delegation.) He expressed his appreciation and promised his continued recalled that at a critical stage of the Conference, when support for Amateur Radio. deadlock had been reached on the frequency allocation table, he, together with one delegate each from Russia, Roll Call USA and France* locked themselves in a small room until The following were present at the Seventh Reunion: the deadlock was broken. Sir Albert Did how he had to G2DC, DX, IY, JF, KI, Ki, MI, MR, NH, NJ, NN, PU, obtain the support of the two RSG13/1ARU observers at the UJ, UV, VB, YL, G3AG, FG, HT, MI, G5BV, HZ, CV, Conference, President Stanley Lewer, G6LJ, and Secretary DJ, FI, GR, JO, KH, LC, MA, PP, RV, UM, VM, WP, John Clarricoats, G6CL, to a compromise solution of XW, ZK, G6CJ, CL, FI, GR, HR, IF, JQ, LL, LQ, MN, amateur frequency problems. That compromise resulted in NR. PA, QM, RB, XV, G8DF, DT, NY, PB, TY, May the unfortunate loss of 50 kc/s between 14.35 and 14-4 Mc/s Gadsden " G1YL," Horace Freeman " Ad-Man," and Sir but it led to the retention of Top Band and 3.5 Mc/s and to Albert Mumford. the acquisition of a new band at 21 Mc/s. G6CL Sir Albert remarked that he had greatly admired the pioneer work of amateurs both before and after the war and he paid tribute to their war-time activities having had close personal knowledge of some of their work, much of which SAID LONG AGO had not been publicly disclosed even up to this late date. He had had the pleasure of meeting all the RSGB Past " The density of the ionosphere appears to follow the Presidents present that evening when he had attended sunspot cycle of I 1 years and it will be of great RSGB Amateur Radio Exhibitions at the Royal Hotel in interest to continue the measurements now in progress the years after the war and he had also enjoyed the experi- until the next sunspot maximum in 1939. The ence of opening one of the recent exhibitions held at Seymour Minimum of solar activity occurred about the middle Hall. He expressed his interest in RAOTA and spoke of his of 1933 and both magnetic and radio observations long friendship with the Secretary, G6CL. He extended best now show that activity is increasing again. It is wishes for the continued success of the Association. expected, as a result, that the radio engineer will find " Nostalgia "—a feature of all Reunions—was introduced substantial differences in the wireless wavelengths best by Bill Corsham, G2UV, who enlivened his remarks by suited to his purpose for long-distance communica- playing-back tape recordings of sounds produced by various tion." types of early transmitting equipment, which he had Professor E. V. Voter Sir Edward) Appleton, specially constructed for the purpose, beginning with D.Sc., F.R.S. spark and Poulsen arc. He also reproduced recordings of T & R Bulletin, November 1935. J. C. • "1-1«e four delegates were all frequency experts and spokesmen on frequency matters for their administrations. J.C.

388 RSGB BULLETIN JUNE, 196S T HE et0- ON THE A CHRONICLE OF EVENTS ON THE HF AMATEUR BANDS

By M. E. BA ZLEY, G3 H D A•

N thc morning of April 27 CEOXA began operating News from Overseas O from Desventorados Island in the San Felix group, News from North Borneo comes via 9M6BM and active causing initial QRM on the h.f. bands. Two stations, one stations are 9M6A B, 9M6AC and 9M6BM. 9M6BM runs a using faultless code and the other on single sideband were KW2000 into a half size G5RV on 20 and 15m. Preferred to operate around the clock for approximately 75 hours frequencies are 14005, 21005 kc/s c.w. and 14110. 21250 kcis giving contacts to all and sundry at a peak rate of 120 per s.s.b, and it is hoped to have a cubical quad up soon when no hour. To an outside observer the spending of £1,750 to doubt more potent signals will be heard. 01 particular reach a small piece of land mile from anywhere to hand out interest to Top Band users. 9M6BM has been granted per- RSTs to other amateurs so that they may have the pleasure mission to operate between 1.8 and 1.9 Mc/s from October I of exchanging QSLs may seem pointless; but from those until February 28. 1966. Skeds may be arranged by writing three days of activity it became quite clear that 15m was to Flt/Lt. W. McLardy, RAF, Tawau, BFPO 663, using once again proving to be a real DX band, with CEOXA Forces Airmail. All contacts with 9M6BM will be confirmed putting workable signals into Europe on c.w. and s.s.b. from through W2CTN who is acting as QSL manager. 14.00 until after 24.00 and for most of that time they were the MP4BBE who has been active on c.w. for a number of only stations audible on this band. Likewise it was proving years and responsible for giving many stations their only easier to work them on 80m (between 05.00-06.00) and 40m Bahrein Island contact is now back in this country. John (between 07.30-08.30) than it was to make contact with the intends to take the RAE in November and hopes to have a station on Me DX baud 20m. G licence soon after. QSL's for MP4BBE may be sent via This apparent rise in conditions on bands other than 20m G2 M I. was not just a chance opening peculiar to CEOXA as other VP3BF was the call originally issued to 9G I BF when he DXpeditions and active DX stations have proved time and arrived in British Guiana. This has now been changed to time again in the past. It seems a pity that stations have to VP3JR; QSLs should continue to go to W3HQ0. crowd on 20m in the belief that this is the only band to work G3NKQ, who is ex-ZBICR, passes on the new address of DX on, when paths are often open on other bands which are VK2AVU who operated from Willis Island under the call- not being used due to lack of activity. Possibly one cannot sign VK4JQ. The address is as follows: 2/4 Wyuna Avenue. lay all the blame on the old excuse of the sunspot cycle and Harbor& New South Wales, Australia. conditions; and if some of the equipment, time and energy VK4SS passes along the following information on Pacific used by stations chasing DX on 20m were applied to 10 and activity. VK9CJ (Port Moresby) now operative on all h.f. IS, conditions of these bands no doubt would " improve " bands using a.m. and c.w. and is always on the lookout for and some spectacular contacts be made. If it takes a trip by four men to a small piece of land in the middle of nowhere to make us use fully the h.f. bands allocated to us, then all the money spent on this trip will have not been used only to give pleasure, and perhaps amateurs throughout the world could participate in a worthwhile contribution to IQSY.

NFD News The Radio Society of Zambia is organizing a field day station 20 miles West of Kitwe with the special call-sign 9J6AA/P. The station will be active from 13.00 GMT on June 12 until 15.00 GMT on Sunday. June 13. Two transmitters will be used, and the " A" station will operate contest-style throughout the period using c.w. on all bands from 160 to 10m and will be particularly interested in contacting European portables although all calls will be answered. The " B" station will concentrate more on local publicity and will operate a.m. phone and c.w. at a more leisurely pace. All contacts will be confirmed. Tops C.W. Club members DJ6SI. DJ7LQ and DJ8CN will be operating from Luxembourg during this year's NFD using the call-sign DJ6SI/LX/P. All bands will be used and equipment will be KWM2 into a variety of aerials.

• Please send all reports and news items to RSGII Headquarters to arrise Left to right: GSLC with KEIG OP and K8Z N C (Bill and Bionic not later than June 17 for the July issue and July IS for the August issue. Besse) during a recent trip to the USA.

RSGB B ULLE TIN JU NE, 1965 389 European contacts. VR4CR is active on 20m c.w. and was that band " ... (the days of the trap loaded Top Band beam heard calling CO Europe. Also on from the Solomon are near!!!) Islands is VR4CM who prefers c.w. Y.111)1. using c.w. on 40 Awards and 20m mainly at weekends. FK8Alt, AL and HG are on The Diploma of Saint James is sponsored by amateurs in 40 and 20m from 04.00 onwards. the Galician region of Spain and may be claimed by working HZ1A rs (G5K W) travels have taken him into the two ten of their number between July 25, 1964 and December 31, Middle Eastern Neutral Zones during the past month. 1965. Anyone interzsted in obtaining this award may have Cards should be sent to GRKS from whom they will be a leaflet giving full details from G3HDA. collected when Ken returns to the UK in June. The IOTA Directory of Islands contains some 500 entries. Six continental sections list all the main Island groups, tlle Stations who contacted a " YU1S.I" on Top Band during majority of known minor groups, larger Islands not covered September 1964 unfortunately worked a pirate, as a QSI. oy a group name, most of the remote Islands of the World's sent by G3RSD has been returned with the comment that oceans and includes all present DXCC islands. The cost of YUISJ does not possess Top Band gear. the Direemry is: UK 21-. Overseas (by surface mail) four Filially, the following is quoted from the April issue of IRC's. In connection with the IOTA Directory the following Auto-Call, the italics are ours. " Potomac Valley Radio awards arc available: Society amassed a total points score in the ARR1. phone IOT A AFRICA AWARD IOTA NORTH AMERICA AWARD contest surpassing any previous effort. Multi-op W3MSK IOTA ANFARTICA AWARD IOTA OCEANIA AWARD wound up with a record I•5 million points score, working IOTA ASIA AWARD IOTA S011 Eli AMERICA AWARD more than 1,500 DX stations during the 96 hour contest IOTA ninon: AwAito IOTA Wont» AwArto period. The new 8Ont rotary accounted for 45 countries on IOTA CENTURY CMS lOO A%VARD

PROPAGATIO N PREDICTIONS

14 mcis U.S.A. - EAST (W1- 4) S P 1 = 1221%2 U S.A... WEST (W6,7) 5 P L. P. I 1 =211 =1 CARIBBEAN (6v5/FM/TI) S P ' L. P. o

S P z I C81222= 1 BRAZIL (PY) L. P.

SOUTH AFRICA (ZS) S P. CLGO2Zia =7 S. P. S.E. ASIA (H5,9 M2) L. P.

S. P. t AUSTRALIA (VK) 1 t t i

S. P. I JAPAN (JA) L. P. JUNE 4965 1:1222i221:2 CD2ERZE=1

TIME (G.M T.) 00 02 04 06 08 10 12 {4 16 18 20 22 24

21 Mcia U.S.A. - EAST (W1- 4) S. P e I U.S.A.- WEST (W6,7) S. P CARIBBEAN (6Y5/FM/TI) S. P. t InT"zzz{ I BRAZIL (PY) S P. SOUTH AFRICA (ZS) I »w.r...ree e weeeze4tr.+21 I S.E. ASIA (HS,9M2) S P. r I AUSTRALIA (VK) 5. P. e e JAPAN (JA) S. P. JUNE 1965

TIME (G.M.T.) 00 02 04 06 OB 10 12 14 16 18 20 22 24

C I 1-5 days 1 =8 6-20 days Openings on more than 20 days in the month

The month of June, together with the months of May, July and A merica, Japan, Australia and South America. and in exceptional August. is a typical sum mer month and will produce few good cases with South East Asia and Central America. On suitable days openings for DX on the two higher frequency bands. Owing to the contacts with Hawaii should be possible via the short path on 14 Mes low level of sunspot activity, 28 Mes continues to be of little practi- between 05.00 and 09.30 GMT. On 7 and 3-5 Mc's DX contacts are cal use for DX, though in exceptional cases the band may open to basically possible when the greater part of the transmission path Africa from 14.00 to 18.30 GMT, and to South America from 18.00 to lies in darkness, and this condition applies particularly to 3-5 Mc's. 21.00 GMT. Together with 21 M es, the band will produce some As the GtRN, which is generally more severe on 3-5 than on 7 Mc's, contacts via short skip sporadic-E over distances from 300 to 1,200 reaches its maximum during June and July, 3-5 Mes will only occa- miles. On 21 Mes, only DX traffic with South America and Africa sionally open for DX. Local traffic on 7 Mes will frequently be will be certain and then only for a few hours. North America will affected by the dead zone, because during the present phase of the only come through under exceptional conditions, and Western sunspot cycle the daytime F2 m.u.f. often falls below 7 Mes. At the North America and Japan will not be heard. The main DX band present time 3 S Mc s can be used day and night for local traffic will be 14 Mes, especially in the afternoon and evening, and also without interruption by the dead zone. frequently during the night and early morning. It will therefore pay The provisional sunspot number for April 1965 was 6.8 with the those interested in DX contacts to spend some time on the band sunspot activity concentrated in the second half of the month. The during the night. In the majority of cases, the DX results on 14 Mes predicted numbers for August. September and October are 17. should be good. The sum mer conditions frequently permit contacts 18 and 20 respectively. on 14 Mes via the long path, in particular with Western North

390 RSGB BULLETIN JUNE , 1965 Q T H C orn er

EL7B Via U3NMR. 95 CoHo-mood Gardens, Essex. ET3DR Via K8KLV, 258 S. Burgess Avenue, Columbus, Ohio, USA. G3KPY (ex-9M2130). Millstones. Beaulieu Road. Bexhill- on-Sea. GM3RK0 (ex 9M41.-11. I Boutin Terrace, Kinloss, Forms, Morayshire. HISNIMN Via W2CTN. HPIPV Box 1149, Panama City. IPIZGY Via ITITAI, via Terresanta 58. Palermo, Sicily. KCIAD Via KOACI, 2780 S. Raleigh Street, Denver 19, Colorado. KH6EDY USCG. USNS. Box 36, clo FPO. San Francisco, Calif. 96640. KH6113J/KJ6 Via KH6FB.I. 1132 McMorris Drive. Honolulu IS, Oahu, Hawaiian Islands. KR6JZ Via W2CTN. KS6BN/KB6 Box 87, Canton Islands, South Pacific. KW6EK Box 544, Wake Island. 0A8D/3 Via W2CTN. 0Y7ML Via DL6EQ. Traubenstr. 3, 655 Bad Kreur.nach. West Germany. OHO OSL Bureau Box 1, Mariehamn, Finland. Smitty. 9VB6IEV, operating the club station KX6B Q. The rig SVOWF Via W2PCI. 18 Adrian Street, East Northport, comprises a Collins " S " line into a TA33 at 100 ft. New York, USA. TG9EP Box 684. Guatemala City. VK4TE Via VK2AGH. 79 Kyle Parade, South Hortsville, DXpedit ion News NSW. VK9AG Malaguna Road, Rabual, TNG. W4DQS, who was one of the operators in the recent VP2KL Via Hammarlund. CEOXA trip, in a letter to G3HDA outlines the frustrations VRIS Box 288, Suva. Fiji Islands. experienced by the gang in getting this country on the air. YN9JUL Box 25, Matagalpa, Nicaragua. The original boat chartered by them fell through due to a YS1RFE Via K7UCH. 11103 N.E. Fremont Street, Portland 20. Oregon. USA. break-up in the partnership of the boat owners. After 7.071P Via RSGB. numerous cables and through the efforts of CEIGJ another Z11...3VB Via ZL2GX, 152 Lytton Road, Gisborne, New boat was found and the gang proceeded to Chile three days Zealand. 51I3J R Via W2SN M. 2483 Third Avenue, East Meadow. later than originally planned. On arrival in Chile the NY, USA. troubles really began as port clearance could not be obtained .5W I AZ G. W. Ashton. Faleolo Airport. Apia, Western Samoa. and after five days' wait they were preparing to return to the FIZIATI8Z41Via G8KS, Orchard Lodge, St. Leonards Road, United States when they were granted the necessary permis- HZIAT/8Z5S Eastbourne. sion to proceed. The five days lost were lost forever, and 9L1MJ Box 907, Freetown. Sierra Leone. meant that there were five days less to have on the Island. 9816BM Via W2CTN. 9M2KZ Via GW31E0." Silhill," Dinas Dinlle. Llandwrog, The landing on the Island was made at nightfall and 30 Caernarvon. minutes after their last contact as CEOXA/M M the first • • • RSGB QSL. Bureau: G2MI, Bromley. Kent. QS0 from CEOXA was made. A second station was set up the following day and beams were erected for both stations. Operations continued for three and a half days and the last The following requirements arc necessary for awards: contact was made at 09.50 on April 30, when 6,500 contacts (i) Each Continental award equals 75 per cent of the were in the log from 75 countries. activated Islands/groups in that continent. Conditions were fair to excellent and one of the best open- (ii) IOTA World Award equals 50 per cent of the activated ings was on 15m on April 29, when over 1,000 contacts were Islands/groups in each of the seven continents. made by the c.w. station in 11 hours. QSL cards are in the (iii) IOTA Century Club 100 Award equals any 100 acti- process of being printed and it is expected that all requests vated Islands/groups appearing in the Directory of will have been despatched before July I. Contributions Islands and must include at least one from each of the towards the cost of this trip would be appreciated. All QSL seven continents. requests must be sent to W4DQS and if a direct reply is req u i red (iv) Contacts for IOTA Awards count only from December return postage and a self addressed envelope are essential. 1, 1964 KIQHP will be active again from French Somaliland Address all award applications with QSL's. or orders for the using the call FL8AK from June 4 until June 14 on 14040, IOTA Directory to G. Watts, 62 Belmore Road, Norwich, 21040 kc/s c.w. and 14250, 21250 kc/s s.s.b. All QSLs via Norfolk, NOR-72-T. KlUCH. The European DX-Diploma is a new award being sponsored by DARC. Briefly this award has to be re-applied for each A WARDS year starting from 1964 and is based upon working countries Information on current certificates and awards will be from the DARC DX report list in the proportion of 20 found in the Directory of Certificates and Awards which European countries to 30 other countries. This is a minimum deals with between 600 and 700 awards, both for the requirement for the award and stickers for each additional transmitting amateur and the s.w.l. This volume is 10 countries must be in the same ratio of four from Europe produced in loose leaf form, suitable for a three ring to six from the rest of the world. Further information binder, by C. Evans. K6BX, and publication is quarterly together with application forms may be obtained by sending from January 1 in each year. Each issue is self contained an IRC to DARC—Geschaftsstelle, Hans Hanson DL1JB, and amendments are not issued. Stocks of this book 2300 Kiel, Beselerallee 10, West Germany. are not held to ensure that only current volumes are Readers will be sorry to learn that the latest news on Clif distributed, but orders for direct delivery from Evans, K6BX is that he has now only 10 per cent vision in his K6BX may be placed with G2BVN. The non-profit remaining " good eye." The Directory of Certificates will cost per issue is 18s. 6d. post paid, with a binder continue but current orders are understandably running a costing a further 7s. 6d. if required. little late.

RSGB BULLETIN JUNE, 1965 391 Gus Browning, W4BPD, still manages to make the pulse Johnston Island front June 1 using 14257 kc/s each day for quicken whenever he is heard as no one is ever certain from European contacts. which part of the globe he will turn up next. After a spell of VK3AHO will operate from Timor as CR8BH. Operation activity from AC3H Gus is due to show up from Tibet will commence on May 27 and last until June 15, after which signing AC5H/AC4 during the first or second week of June. Bill will have one week's activity as VK3AH0/8. QSLs via The University College of North Wales and the North Hammarlund. Notts Amateur Radio Societies are organizing a joint The rumour corner offers the following doubtful informa- DXpedition to the Isles of Scilly this summer. GW3PMR tion: Clipperton Island— W6FAY is trying for a licence. and G3NHE will operate from July 4 until July 16 using the Swan and Navassa Island activity by VP7CX in July. call-sign G3RC W/P. Activity will be on 160m c.w. with the UWOIN should be active from Wrangel Island during June. possibility of some 40 and 80m operation. ZL3VB will be the call used by Ian ex-ZLIABZ, who Contest News arrived at Chatham Island on May 16 and will remain until The annual WAD M C.W. contest will take place this year June 14. If conditions are good the stay may be extended between 20.00 GMT on October 2 and 20.00 GMT October for an extra four weeks. Preferred frequencies are C. W: 3. using all bands from 80 to 10m. A six-figure number will 3540, 7020, 14040, 21040 kc/s. S.S.13.: 3610, 3750, 3810. be exchanged (RST plus QSO serial number) and each 7070, 14120, 14270, 14335 and 21380 kc/s. Times of opera- complete contact with a DM station counts three points. tion will be limited as power is not available on the Island incomplete contacts are worth only one point. The multi- for 24 hours a day. plier is the sum of all districts contacted on each band and KH6FI3J/KJ6 will have a further one week's activity on each district is identified by the last letter of the call. Logs, which must be for all band operation only, from single operator or multi operator stations should be posted not Asiatic USSR Prefixes later than October 30 to Radio Club Der DDR-D M Area Prefix Zone Contestbureau, Box 30, Berlin 55. East Germany. — Chelyabinsk UA9A-B 17 From WIWY of CQ Magazine comes the results of the — Sverdlovsk UA9C-D 17 1964 CQ Phone Contest which attracted over 700 entries but Perm } UA9E-F 17 as usual very few were received front the United Kingdom. Tagil An interesting feature of this year's contest was that the top Tomsk UA9H 18 Tyumen 1, honours were all taken by Venezuelan stations. Our Hanti f UA9J 17 congratulations to GI3CDF for being world leader on 80m Omsk UA9M 17 and to G3FXB for being European leader on 20m. — Novosibirsk UA90-P 18 Kurgan UA9Q 17 Top Ten Orenburg UA9S-T 16 All Band—Single Operator Kemerov UA9U-V 18 — Bashkir UA9W 16 YV5BIG 757.874 ZLIAI X • • 486,402 — Komi and Vorkutu UA9X 17 CX3BH 617.148 DJ2QZ • • 479.386 Altai and Barnaul UA9Y 18 W3MSK 598,620 K2H L B • • 473.556 Krasnoyarsk } UAOA-B 18 HC2JT 586,713 ZE1JE • • 427.575 Nobilsk DJ6QT 538,916 HB9ZY 412,895 Cape Chelyuskin UAOKAE 18 UAOB Dickson Island UAOKAR 18 Top Six UAOAZ-BC-BD-BF Khabarovsk UAOC 19 Multi-Operator Single Transmission UAOG YV9AA .. 1,382,036 II RB .. 649.0(X) Sakhalin Island UAOE-F 19 or 25 T1ORC .. 740,526 HC2LDA .. 524,208 Cape Schmidt DL I JW .. 701,274 K2IEG .. 487.326 Bering Pevek UA01 19 Leading UK Station GW3N WV (GW3N WV and GW3D1X) Magadan 403782. Wrangel Is. — Blagoveshchens (Amur) UAOJ l'e Port Nahodka UAOK 19 Top Station — Vladivostok UMW 19 Multi Operation Multi Transmitter Ussuriisk UAOM 19 YV5AKU 1,463.871 Buryat-Mongolia _ UA00 18 Ulan-Ude Yakutsk UAOQ-R 19 Continental Leaders Olenck I - Irkutsk UAOS-T 18 Single Band — Chita UAOU-V 18 28 Mc/s Tannu-Tuva UAOY 23 LUIDAB . 35,1 36 4\4'0.1 1,632 Kamchatka UAOZ 19 Petropavlovsk K6CT 560 UPOL Stations orth Pole Drifting Stations (JAI KED Alexander Island. Franz Josef 40 21 Mels Land 71,463 UAIKAE Mirny Base, Antarctica WA2SFP 100,287 Di 1ZG UA I KAE/ I Dmegrosky Base CR6JL 84,240 K H6FJI.. 25,912 UAIKAE/2 Oaza Base PY5EG .. 15,120 UA1KAE/3 Pionierskaja Base 29. 30 UA1KAE/4 Komsomolskaja Base 14 Mc/3 UAIKAE/6 Vostok Base UAI KAE/7 Sovietskaja Base CX2C0 414,005 G3FXB 251,540 291,870 4X4GQ 21 1,050 This list is based on information supplied by GM31TN. 5A 1TW VP7NS 286,003 KH6FBJ 117.350

RSGB BULLETIN JUNE, 1965 392 7 /Nets North, Central and South America with excellent tignals coming through. DJ2YA 14,965 JA2BTV 13,050 It is also pleasing lo note the increase of activity on 10m. K2GXI 14,706 PY4ND 2,996 On this band ZE6JL reports contacts with EA, FK8, OD5, 71 4130 2,900 UA, UB, UL7, VK2, VK6, YK and ZC4. From W/land comes reports of contacts with South America and South 3.8 Mc/s Africa while activity in the Pacific is supplied by VK5K0 GI3CDF . 35.052 WIBU 21,390 who reports contacts with Ws and 9M4LP. On February 21 4X4AS 29.392 YV5ANS 7,161 at 07.15. VK5K() heard an OZ station calling CQ on 28020 ke/s. England Contributors are thanked for their interest, and once again it must be stated that all lists should be in alphabetical order G3DYY .. A 58,830 226 44 • . 84 as the writer had to wade through over 1,000 call-signs this G3M WZ 6,264 58 19 • • 35 month, which were supplied by: DL2CT, G2BOZ, G2LB, G2AJB 4,472 64 14 29 • • G2RO, G3APZ, G3DO, G3AAE, G3FK M, G3HCT, 4,042 63 13 30 G3MKX • . G3KSH, G3KSK, G3PUF, G3SML, GI3PLL, GM31TN, C3CAZ 21 23,256 167 18 33 • . G4MJ, G8JM, A2498, A3374, A3699, A3902, A3942, G3RM F 21 8,976 81 16 28 • • A4048, A4124, A4311, A4431, A4552 and A4574. G3PZO • - 8,624 75 16 33 G3FXB • . 14 251,640 778 33 87 1.8 Mc/s C.W.: OK1KGA (23.00), OL6AAD (23.00) and G3LSF • • 142,010 476 39 71 OL6AAE (23.15). 031-IDA • • 7 14,326 142 22 50 3-5 Mc/s C.W.: CEOXA (05.00-06.00). 3.5 S.S.B.: KZ5W1 (06.25), OHONC Aland Is. Northern Ireland (22.40), 0Y7ML (21.35), VE1AZ (23.00), VEIIE (23.10), GI3SXG . A 61.908 348 25 5/ VOI FB (23.10), ZL2RK (06.15), ZL3LE (06.40), ZL4LN GI3CDF 3.8 35,052 309 19 50 (06.15), 4U I ITU (22.10-23.40) and HZIAT/8Z4 (22.40). 7 Mc/s C.W.: AC3H (17.17), CEOXA (07.00-08.30), Scotland EL2AD (23.30), FG7X1 (02.45), HIIIIBC (23.20), HI8RVD (23.05), 14K1JF (02.50), HK3AS1 (01.15), HK7UL (02.50), GM3BCL A 60,120 262 41 79 K.P4ASN (23.55). KV4C1 (23.30), MP4TBO (20.00), GM3JDR 21 6,626 70 15 23 UAOKSB (23.45). VP4VU (21.50), ZL3UY (09.00), 4U31TU GM3SFH 14 1,056 47 4 18 (21.01), 7X2AH (21.59), 9J2DR (21.45) and 9J2DT (21.10). GM3NQB 3.8 3,668 130 5 23 7 Mc/s S.S.B.: ET3USAjP (20.35), OHONI (07.10), MP4TBL (20.50), 0A4MX (07.10), VK2AVA (20.50), Wales VK3AHO (19.45), VK3ATN (21.15), VP2SM (23.10), YA4A GW3SFC .. A 2,970 66 9 24 (20.10), ZL3UY (07.15, 09.10), ZP5KT (22.28), ZSIXR GW30CD .. 14 21,945 186 19 38 (22.30), ZSIXX (20.25), ZS5GY (21.55), Z.S6YQ/ZS9 Number groups after call letters denote the following: (20.45), 4U4ITU (22.30), 5N2RJO (20.30), 7Q7PBD (20.00, Band (A-all), Final Score, Number of QS0s. Zones and 20.15) and 9J2WR (21.00). Countries. Certificate winners are listed in bold face. 14 Mc/s A.M.: CR5SP (21.55), CR6GB (17.35), CT2AM (17.55), EA8EX (16.52), ET3USA (17.05, 20.32), FM7WN Commonwealth Call Areas Table (20.55), FUSAG (10.15), HI4XAB (22.25), HI4XEC (22.46), IS 3.5 7 14 21 28 Mc/s Total MP4TBC (17.00), PX I AC (17.00), PX I AD (12.54), TN8BG G3KSH - 26 24 66 25 - 141 (20.25), TU2AP (06.50), U18K00 (08.58), VE3CVL/SU G3DYY - 9 27 51 16 2 105 (07.40), VE8SK (19.50), ZEIAE (18.00), ZSIYR (17.45), G8JM 4 - - 66 13 I 84 5Z4GT (17.45), 7X2MD (07.30), 9GISC (20.30), 9.12DT VO 1 FB 11 15 13 31 8 1 79 (20.28), 9U5BB (19.53). G3AAE _ 7 40 22 _ 69 14 Mc/s C.W.: AC3H (14.00), AC6H (12.05), AC9H G3LHJ 3 3 5 29 26 2 68 (13.08), ACOH (12.50), AP5HQ (13.13), BY3NA (12.00), _ 5 19 4 _ /8 5N2AAF BY9SX (12.00), CEOXA (17.00, 21.00). CM1AG (20.00), DL2CT 3 6 3 7 2 - 21 CO2KG (18.50), CO2KG (19.55), CPI EA (22.30), CP3CD A2498 1 8 8 71 29 6 124 (21.40), CR4AE (07.15), CR4A1 (18.20), CR9AH (12.35). A2340 6 13 22 51 18 1 Ill CT3AQ (20.50), DU IOR (14.17), DU9FB (13.40), EL2AC A4048 5 1/ 5 55 15 2 94 (18.13), FG7XC (19.20, 19.45), FG7XS (22.40), FK8AT A4311 1 10 I 60 17 3 92 (08.15), FL8RA (16.37), FO8AQ (06.55), FO8BJ (08.55), A4201 4 9 4 53 13 3 86 FR7Z1 (16.20). FU8AG (08.00-10.15), FY7YJ (21.45), A4552 2 - 34 44 5 85 HI8M MN (21.20). HM 1 BB (09.00), HM5CP (09.30). A443I 1 X 34 38 31 I 85 HPIAC (23.00), HPI BR (21.48), JTIAE (09.50), JTIAJ i 14 1 41 20 2 81 A3902 (15.45), KA9MF (10.50), KB6YQM (07.30), KG6SB 5 II 10 34 10 ..._ 80 A3699 (09.26), KR6JZ (13.55), KR8AXI (16.11), KS6BN (06.40), A3942 4 14 19 32 7 - 76 KS6BV (07.25), KW6EK (08.45, 09.00), KX6DQ (09.00), A4311 I 8 - 54 9 2 74 KZ5RD (23.18), LA2QJ/P Jan Mayen (10.00), LA4EJ/P 3 5 5 40 16 2 71 A4038 (17.25), LA5ZJ/P Jan Mayen (09.37), LA8FI/P (21.00). A439I 4 6 2 22 19 3 56 0A6AW (20.10), PZICL (21.40), PZ1CM (19.45, 20.45), A3766 1 6 I 26 11 - 45 PJ2ME (22.10), PZ1CM (20.45), TI2WD/8 (21.05). TN8AF (19.00), TU2AN (21.00), VK4TE (Willis Island Band Activities 09.30), VP2AV (21.15, 21.50), VP5BR (Turks 22.45), Another very good month, particularly on 14 Mc/s where VP5REI (Turks 19.30). VP6BW (22.00) VP8HJ (19.45), morning openings to the Pacific have been consistently good VQ8BY (17.00), VQ9HB (18.30), VRIB (11.30), VRIS and have sometimes lasted up to three or four hours. It has (07.30-10.15). VR2BZ (08.50). VR2ER (07.18, 07.55), also been gratifying to hear the band open every night to VR IS (07.30-10.15), VR2BZ (08.50), VR2ER (07.18, 07.55), liSGB BULLETIN JUNE, 1965 393 (VR4ED (09.30), VS6FK (13.20, 15.55), VS90B (16.50), (13.54), 9H I K (16.00), 9HIR (18.25), 9K2AD (08.35), VS90C (15.15), VU2G W (15.10), XE1OE (23.22), YK1AA 9L1WN (17.10), 9Q5RB (17.55), 9U5AB (16.50), 9X5AV 16.00), YSIO (23.45), YSIRFE (20.43), ZD7IP (07.40), (17.35), 9X5RZ (16.39). 20.00), ZD8BB (08.00, 09.00), 3V8AX (18.00), 4S7EC 21 Me/s S.S.B.: CEOXA (16.02-24.00), CE3RC (19.25), (16.30), 4S7WP (18.45), 4U5ITU (20.00), 5W1AZ (07.30- CX3DH (16.40), EA6AM (18.15), EL6E (16.16), EL8D 08.45), 60611W (22.25), 6Y5AR (21.30), 9G1FK (12.30), (17.09), JA6BEE (12.00), KV4CX (16.00), KZ5AB (16.35), 9M6LX (16.15) and 9X5M W (18.50). KZ5AW (17.35), LU7DG M (16.25), MIZG (14.30), OD5BZ 14 M O S.S.B.: AC3H (14.20), AC8H (15.58), AC9H (12.09), TL8SW (16.35), TGOAA (22.00), UJ8KAA (09.58), (16.35), AP5KC (06.30), BV1USA (13.20), CEOXA (21.15), UW9AF (12.10), VK3ATN (08.20), VP7DD (17.10). CO2KG (18.45), CR4AJ (09.50), CR9A1 (14.55), CR9AK VS9AWR (10.15), VS9MB (15.00), YA4A (13.25), ZD7SE (15.54), DU1AA (15.45), DUILM (14.35), DU1MR (14.05), (17.15), ZD8BB, DX, HL. JC, TV (14.38-16.26), ZP5KT DU9FB (15.00), EL2I (08.16), EL2Y (07.23), EP2NO (14.50), ZS6BBB/ZS9 (10.00), 4UISU (16.42), 5H3JR (15.00), EP2RW (13.20), ET3DR (17.10), FG7XL (21.40). (17.40), 5N2JEB (17.19), 5X5IU (16.30), 5Z4AA (16.55). FG7XR (17.00), FG7XS (21.00), FG7XT/FS7 (18.25), 606BW (12.28), 7Q7PBD (15.54). 7Q7PM (17.58), 9G1EC FH8CD (16,43), FO8AG (07.35), HBOLL (20.50), HC8FN (17.33), 9J2WR (16.08) and 9Q5QR (16.45). (19.24), 1-118JAL (19.25), HI8RBG (12.22), HKOQA (20.20), 28 MO A.M.: CR6GV (16.51), LU6DAF (15.00), LX1DC HM1AB (10.37), HP1SH (21.50), HRISO (21.25), HR3HH (16.15), OD5CC (16.35), ZC4GT (12.20), ZE1BB (15.50), (11.35), HSI HS (15.48), HV1CN (19.00), HZIAT (17.20), ZE2JA (14.49), ZE2JE (16.00), ZS6BDT (13.36), 9G1DM HZIAT/8Z4 (17.20), IPIZGY Pantellaria Is. (19.10), KB6CB (16.11), 9J2DT (13.15), 9Q5DT (13.53). (07.45), KB6EPN (08.25), KC4USA (06.45), KC4USB 28 Me/s C.W.: DL, EA, EA6, HA, HB, I. LA, 0E, OH, (08.40), KC4USV (06.48), KG6IG (08.50), KG6SB (10.55). OZ, SM, UA, UB, UC, UP, UQ, UR, YO, YU (08.0°- K7MAH/KG6 (11.00), K5CQK/KH6 Kure Island (06.40), 17.00), VS90C (11.45), 4X 4A F (13.05), 4X4WF (13.05), KJ6BZ (10.00), KH6FBJ/KJ6 (08.20), K7TJC/KJ6 (07.50), 707RM (14.05), 7X2R W (09.50), 9J2BC (10.20) and 9J2DT W9FKL/KJ6 (09.06), KM6BI (06.45), KM6CE (08.25). (09.55). KR6UL (19.15), KR8CA (15.15). KS6BA (06.50), KS6BK 28 Me/s S.S.B.: LU 1 HHH (13.25), OD5BZ (14.01), (07.45), KS6B0 (07.47), KS6BQ (07.45), KV4CF (19.35), 5H3JJ (16.32), 9G I KS (16.18) and 9J2WR (14.46). KV4CX (19.45), KW6CV (08.10), KW6CP (09.07), KW6EB (09.10), KW6EJ (08.03), KX6BB (09.20), KX6B0 (09.45), DX Briefs KX6BU (07.36), KX6BR (08.06), KX6DQ (09.55), KX6NG (06.55), MIZG (13.05), MP4TBM (16.45), MP4TBO (14.30), 5WIAZ, who is ex-ZK1BV, is now active from Western OHONI (12.45), PJ2CR (21.00), PZ1AG (20.00), TG8GZ Samoa. George prefers operating around 14085 kc/s at (22.30), TG9EP (20.00), TG900 (00.35), TG9RR (21.17). 08.00. TI2KMC (20.45), TI5RC (16.30), TJI AC (18.10), TU2AW VU2DIA is reported to be a new station active from the (07.37) UAOYP (Zone 23 10.15), VK9AG TNG (14.30), Andaman Islands and will operate mostly on 14 Mc/s c.w. VK9CR Cocos—Keeling (15.15). VK9JV TNG (13.25), during his three-year stay there. VKOGW (09.58), VP2GCA (17.00), VP2GTA (21.28), KM6DJ promisès c.w. activity most days on 14010 kc/s VP2KD (21.50), VP2KL (21.30), VP2SM (19.00). from 06.30 until 08.30 GMT. Joe expects to remain on VP2SRC (22.27), VP3HAG (22.22). VP4VP (21.02), VP7NQ Midway Island until the end of June or July. QSLs may be (17.10), VQ9HB (16.16). VR B (10.00). VR2EK (08.55). sent via KM6CE ot the Bureau. VR2ET (08.38), VS5M1-1 (14.20), VS6AJ (14.45), VS9MB W2JAE is scheduled to be active from FP8CK using all (16.23), VS9PCZ Perim Is. (05.10), W2ZIA/ZK1 (07.05), bands from June 1 until June 18. XEIOE (19.50), XEIRR W (23.55), XW8AY (16.06), VK4TE of Willis Island is often a strong signal in Europe XW8AZ (14.15), YK I AA (07.22), YS1SRD (20.30), on 14063 kc/s between 09.00 and 11.00. YS2MF1 (20.55), YA3TNC (15.40Z). YN3FP (22.05), VRIS appears to be crystal controlled on 14015 kc/s and YA4A (08.45), YN9JUL (21.25). ZB2AK (12.55), ZD5R has been putting strong signals into the UK at weekends (17.40), ZD8BI, HL, JC, JG, JL, LT, SI, TV (16.35-23.00). between 08.30 and 11.00. ZP9AY (22.30), ZS6YQ/ZS9 (18.05), 4S7GM (14.20), UAOYP is a new station active on s.s.b. from Zone 23 and 4UISU (18.50), 4U6ITU (10.00), 4WIZ (14.35), 5U7AC has been worked at weekends on 14110 kc/s. Patience is (17.10), 5X5I11 (19.00), 60611W (21.00), 6W8AG (12.33). required as Fedor's English is not fluent. 6Y5DM (11.37), 6Y5RD (20.40), HZ1AT/8Z4 (06.37). ZD7IP has been very active on the h.f. bands using 20 HZ3TYQ/8Z5 (20.20), 9K2BY (18.45), 9L1 Mi (18.40), watts to a Vee beam on G. George says there is no need to 9M6BM (16.30), 9M6LX (17.35), 9NI MM (14.30) and worry about pile-ups as he thinks that in the next two years 9U5ID. he should remove St. Helena from everyone's wanted list. QSLs via the RSGB Bureau. 21 Me/s C.W.: CEOXA (14.00-24.00), CR4AE (20.24), VS9SJF who operated from Socotra Island recently, is CR6A1 (14.00), CR6HG (17.50), CR6JA (07.20), ET3USA now back in the UK and has been issued with the call (14.30), HMI BV (10.50), HM5BF (12.16), JAs (08.58-10.20), G3UCQ. KG6IG Bonin Islands (10.43), MP4QBP (11.11), TN8AA CR5SP is now active on single sideband and is usually (11.20), VS6FF (11.31), VS9A WR (09.40), VU2GG (11.29), found between 21,110 and 21.170 kc/s. ZB2A (20.00), ZD7IP (10.23), 5R8CB (17.40), 9H1AB Gus Browning appeared from Tibet earlier than antici- (19.30), 9K2AD (18.36), 9L1TL (14.12), 9Q5TJ (14.08). pated and has been signing AC4H. After a further three days of operation from AC3 he will return to Britain. 21 Me/s A.M.: CE3XP (16.38), CR5AS (16.00), CR5SP W5OLG will assist in skeds with VR6TC and suggests (10.32), CR6AF, DU, GF, GV, JT, JM (12.57-17.56), 14,040 kc/s on Tuesday mornings between 05.00 and 06.00 CR7FR (10.20), CR7GH (15.15), CX2CM (17.32), ELI H GMT. QSLs via W4TAJ. (17.35), EL2Y (10.30), ET3USA (15.25), FM7WN (19.06), FR7ZD (16.32), KZ5HK (17.05), MP4BEN (08.10), MP4TBO (13.10), 0A4OS (18.04), OD5CY (14.24), PZ1CP Correspondents are thanked for their co-operation and (21.30), TI2XZ (17.17), TN8BK (19.15), TU2AE (17.23), acknowledgment is made to the West Gulf DX Club Bulletin TU2AN (17.10), UF6CW (11.50), VK6GL (12.25), YAIA W (W51GJ) and the LlDXA Bulletin (W2GFD/W2MES). (08.24), ZP3AL (18.40), 5113JR (17.10), 5N2AAC (13.50), Please send all items to arrive not later than June 17, 1965. 5X5JK (18.25), 6W8AJ (18.55), 9G I DM (17.07), 9G1RH for the July issue and July 15 for the August issue.

394 RSGB BULLETIN JUNE, 1965 FOUR METRES AND DOWN

By F. G. LA M BET H, G2AI W'

QOME interesting news has been received from F3SK. motor accident in which F3SK was injured, but he says he ("Uncle ") of Biarritz, who is a pioneer of u.h.f. is quite well again now, for which we arc all glad. practice. particularly in the field of transistorized apparatus These tests, incidentally, are taking place 10 years, almost In co-operation with F9BP/P he has been making the first to the day, after F8OL and F3SK had their first 23cm QSO duplex QS0s between 23cm and 2m using only transistors in (April 30, 1955). the u.h.f. system. On April 20 and 21 tests were made over a distance of half a mile to check the rigs. F3SK used a corner UK Activity on Twenty-three Centimetres aerial inside the house (180 ft. a.s.I.) on the ground floor, and G2CIW (Birmingham 31) would like to see an activity list F9BP/P had F3SK's all transistor receiver. Reception of and sends a report to encourage this. Having been on 23cm course was good. The big corner array was then attached to almost a year now he has worked G3KFD, G3NBQ, F3SK's transmitter and F9BP/P went to a 330-ft. hill six G3BNL, G3KPT, G3FP, G3LTF, G3LQR, G3MAR/P and miles away. He had good reception of F3SK's c.w. using PAOCOB. G2RD has been heard and G2CIW has been only a small corner. On the 21st, F9BP/P went with the heard by F8MX/A. Incidentally, it has been found that same equipment to another hill 400 ft. a.s.I., but not in an signals between G2CIW and G3BNL (Nottingham, about optical path, near the Spanish border. He received F3SK's 50 miles away) can be exchanged even during rock bottom c.w. very clearly and re-transmitted it with his 2m mobile rig conditions. The receiving equipment consists of a trough- as before. The signals were RST539 with a slight chirp. The line converter with an E88CC amplifier feeding into home- receiver was the old " de luxe " all transistor receiver for built double superhet, and the transmitter is a 3CX100A5 24/30 Mc/s. This also contains the 2m and 70cm section tripler running 60 watts input at 1298.25 Mc/s. The aerial entirely rebuilt with many Siemens AF I 39s, and the recently is a corner-reflector trough. finished 23cm converter which includes an AFI02 Chow G3NBQ (Coventry) received G3BNL (1296.82 Mc/s) for overtone oscillator with a 53 Mc/s crystal; AFI02 trebler the first time on April 25. His signal was RST229. On the to 159 Mc/s; AFI02 buffer; AFI39 doubling at 318 Mc/s; 26th, G2CIW (1298.25 Mc/s) was received from the new AF139 doubling at 636 NUM; AFI39 buffer in class A; QTH at RST549 and G3KEF and G3NBQ exchanged S9 AFI 39 doubling at 1272 Mc/s; mixer I N2I B; and an AF102 phone signals. broad-band preamplifier at the i.f. of 24-28 Me/s. All the Another newcomer is G8AFY (Hinckley) who is using an circuits at 636, 1272 and 1296 Mc/s use flat lines, well RSGB Handbook type converter and a 4-over-4 aerial. He shielded and folded to the chassis to get the best magnifica- has received G3NBQ, G3KEF and G3BNL, all at 05. tion. The power supply is a I2V battery. G3FNW has now completed his 2C39A tripler and tests are The transmitter is based on the 2m all transistor trans- being carried out. G8ABB is almost ready, and others mitter, using six stages beginning with a 2NI143 Chow known to be interested are G8AEK and G3BKQ. G3MCS overtone oscillator giving about 24.0516 Mc/s and using in has just completed an 8 ft. dish and expects to get it up the p.a. a PSI 2M1505 with double pi-output circuit. A to 30 ft. soon. Tests between G3NBQ and G3MCS and transistorized system delivers (from a I2V battery) 20V to G3G WL have not yet succeeded. all the r.f. stages except the p.a., which receives 30V. The G3JGJ (Moretonhampstead) is hoping to start on 23cm output power is 500 mW on phone and 1200 mW on c.w. On the top of this transmitter F3SK mounted two frequency and would like to hear from interested parties. He is looking tripiers (from the booklet of Microwave Associates Varactor for some equipment and plans to use an A2521 in the Harmonic Generation, Page II, diagram 7): the first one with proposed transmitter and receiver. a PSI PCI15/10 delivers about 0.5 Won 432.930 Mc/s, while Seventy Centimetres the second one, built in a hurry, uses an ultra high speed, G8AAC (Barnsley) is looking for skeds and contacts high Q switching Fairchild diode 1N914. Keying is achieved by cutting the power applied to the overtone locally and further afield. He is on QRP, with an ASZ21 in oscillator. the final stage modulated by an ASY26 and ASY28 class 13 The transmitting aerial is a home built 90' corner with pair. The receiver is a modified G2DD converter feeding sides of two wavelengths and an adjustable dipole, while the another converter to a 19 set. Skeds have been arranged in receiving aerial is F8OL's horn aerial with a 2 ft. x 2 ft. conjunction with G8AGQ (they both operate /A in the aperture. giving a gain of I6db. He also uses a home built Sheffield area). Calls are started at 20.00 GMT. For the corner similar to the larger one, but with sides of but one first 10 minutes of each half hour they listen on 70cm; for wavelength. Tests across the border with Spain will take the second 10 minute period on 2m and for the third period place soon. Some delay was caused by an unfortunate on 4m. The first QS0 was crossband (2m) with G3LLE. The transmitter used watt to an A252I, seriously under- * 21 Bridge Way. Whitton. Middlesex. Please send all reports for the modulated owing to a transistor failure, with a 2 element July issue by June II und for the August issue by Judy 9. Yagi. Despite a hill of over 200 ft. between the stations they

RSGB BULLETIN JUNE, 1965 395 received a report of RS56 over a distance of six miles. Local with series-gate modulation, performed very well. QS0s stations G8AET and G8AGN arc building for the band: were made with six PAs. three ONs and four Fs. and G6GN G8AET should be operating very soon. G8KB listens on and G3KMT represented DX in a new direction. G3LCK 70cm and G3LIE can operate on the band. again acted as relief operator. G3NBQ (Coventry) now regularly works G8AEX. G3XC (Indian Queens) found the contest the most G8ADC, G8ABB, G3G WL. G3MCS, G3BNL and others. important item of the month. From April 29 the barometer The aerials are now outdoors. Local activity is now good, began to fall to the lowest for some time, and this continued with the following regularly heard and worked: G2CIW, until May 2, the day all the Cornish V.H.F. Group had been G3RYB/T / G8AHR, G3KEF. G8AFY, G8ABD, G8AGS. waiting for. Torrents of rain and a force 7/8 wind kept on G3PTM, G8ABP, G2FN W and G3BKQ. G3NAP is now until they left the site at 16.15 GMT. Only 12 contacts were on 70cm (434.9 Mc/s) and radiating a good signal. G3NBQ made, but to be told after the weather debacle that they were now uses an AFI39 transistor pre-amp and finds it much QRMd by out of zone stations was the last straw. Cannot better than the A252I. competitors be required to observe the Band Plan in these G3JGJ (Moretonhampstead) is able to operate on Mein contests? and was receiving G8ADP (Teignmouth) at RS59 The G3XC may be making a trip to the Peak District, leaving latter station was worked by G5ZT (Plymouth) who was 59, Cornwall on Sunday, June 13, and making for Gloucester. and GRADP was 57 at Plymouth. Derby then Liverpool and back via Birmingham. etc.. returning on June 19. It is anticipated portable operation on Two Metres 2m will be between 18.00/20.00 GMT each evening (subject 613SLI/M (Co. Down) worked G3SPS/M M from south to conditions). of Belfast for the last time on March 27. March 30 was G2JF reports that there has been a definite improvement " open night" and brought QS0s with G2JF (Kent). in normal tropo propagation since May 6. and at the time of G3PRF (Warwickshire). G3OGY (Chorley), G3NAS writing conditions had reached a peak. GB3CTC was (Staffs.), GD3FOC (1.0.M.), G3OWA (Surrey). G3SHK peaking anything between RS55 and 59 at certain times of the (Middlesex), G3BLP (Surrey), G3LTF (Essex), G3PFR day in East Kent. Presumably the equatorial high pressure (Hems.), G3TGE (Beds.) and G8OU (Ashtead). G8OU system which has been drifting north-east has been a sig- seemed rather suspicious of the call-sign. because of the high nificant factor in this respect. Over the period under review signal strength (S9). All these stations were worked on there has not been any indication of extended tropo, except phone, and the beacon GB3VHF was at S8 until 08.00 the for Sunday morning. May 2. when a GM station was following morning, when he gave up. G8DV (Cheltenham) reported as calling G2JF. was worked c.w. and phone on the night of April 2. GM3FYB F3NB (Orly, near Paris) reports rather belatedly that (Dunfermline) was heard working GI5AJ on April II, and amongst many other signals received via OSCAR Ill he so GI3SLI broke in and successfully contacted GM3FYB. heard G3EDD of Cambridge and G6GN of Bristol. On the 16th, a visit was paid to Eire. and personal QS0s G2TH (Ewell) has made an appearance on 2m and is very were made with EI2AK (Drogheda) and El2A (Navan). pleased with his results to date. He runs a QQV03-20A to El2A was first worked from just north of the border. 12 watts and radiates from a 4-over-4 Yagi system at 14 ft. GI3SLI's call sign whilst in the Republic was El5AW/M. He is very impressed with the relative peace of 2m after years When the band is open El2A uses a frequency of 144-248 on the h.f. bands. because the usual frequency (145.8) is too crowded. A kind G6AB (Holland on Sea), one time a 160m exponent of of mobile conducted tour of places of interest was carried some note, has changed his interests in recent years to 2m. out during the QS0 mentioned above! and his signals now compare with the hest. He has quite El7AF (Birr, Co. Offaly) is on 144-36 Me/s and El6A1 recently installed a 60 ft. tower on the top of which his (Donegal) is on 145-38 Mc/s; they were tried on sked, but 6-over-6 slot is sending forth a mighty signal with the usual 'conditions were not good enough. GI3RNO (Antrim) is 6AB quality. also on the band. GI3SLI will be on the band until July when he goes to Gibraltar, but the 2m gear will accompany G5LC/M created quite a stir in South-East Kent whilst on him on the trip. In the meantime, any skeds will be holiday in Folkestone. While he was there he had the pleasure of working his first mobile contact with F2X0 in north appreciated. G3EMU (Canterbury) went portable during the Third France. 144 Mc/s Contest (Portable) on May 2 to their usual site G3SPS/M M can be heard consistently these days between near Folkestone (600 ft. a.s.I.). and enjoyed wonderful Holland and North France. He has changed his frequency weather, together with really good results. The transmitter. to approximately 145-3 Me/s. G6XD (Teignmouth) recently worked G2JF for a first contact during a period of fairly good propagational conditions around the middle of May. He runs an input of BIACO N STATIO NS 15 watts. Nominal Emit- Aerial PAOCML, who is perhaps one of the strongest signals Calinien Location Frequency sloe Direction from the Netherlands, worked 91 stations in the May GB3CTC Redruth, Cornwall 14+10 hies Al North-East portable contest. 30 of which were G and 24 were with DL. G13 VHF Wreckage. Kent 144-50 Mcja Al North-West GB3GEC Hammersmith. 431-5 Mc/s Al East He reports his best DX contacts as being with G3K MT/P London and G3FD/P. ON8NA, although a new prefix and reserved for visiting RUGS VH F. 'MACO N STATIO N 011.3V HF amateurs, is not new to 2m. He was formerly ON4NY. and The frequency of the Society's v.h.f. beacon transmitter at has also been active at various finies with FAO and DL call- Wrotham. Kent, when measured by the BBC Frequency Checking signs. His wife, who is also licensed, signs ON8NB. Suntan. was as follows (nominal frequency 144-se mes): F9NJ (Lille) would like 23cm contacts with anyone who is capable of operating on this band and reports the new Date Time Irror French prefix of FO for recently licensed amateurs. He April 27 15.02 GMT 112 cis high expresses the opinion, confirmed by most operators, that May 4 11.05 GMT 24 Cji high May II 11.00 GMT 20 cis low conditions during the recent 2m portable contest of May 1 May 18 10.30 GMT 1000 cis low and 2 were by previous standards very poor. G3OCB (Truro) says that local activity has been good. hut

396 RSGB BULLETIN JUNE, 1965 conditions poor. At lunch times there is activity between that this filter will attenuate spurious signals appearing G3AET, G3XC, G3IGV and G3OCB/M around 12.00/13.00 outside the 2m band by 50db or more, and also that it GMT, always with the possibility of G3NVJ/M joining in. attenuates below 2m. Further details can be found in the G5ZT, G3IEA, and G3JGJ have sometimes been heard at October, 1964, issue of QST. these times in their own net, but only G3JGJ has been worked. A very lively v.h.f./u.h.f. situation exists in East Germany. Otherwise GW3MFY and GW3FSA have been the only and DM2AWD, the V.H.F. Manager, has sent a list of DX QS0s. on 2m and 70cm, together with news of forthcoming G3JGJ worked GC2FZC at 59+ on April 30. while on contests and meetings. Further details may be obtained May 2 he went portable about 300 yards from home and by sending an s.a.e. to G2AIW. worked, all at 59+, G5ZT, G3XC, GC3KAV, GC30BM It was reported in QST(April) that two Alaskan amateurs, and G30BD/P. G3IGV was also 59+ for most of the QS0. KL7CQS (Anchorage) and KL7ECO (Fairbanks), have been Stations heard were G6XD (Teignmouth), G3CQE/P (59), bouncing 2m signals off Mt. McKinley, North America's and also G3AET. GW3PPD/P, G3KUJ/P (59+) and highest mountain, to one another. They have been keeping G3MPS (59+) were heard several times during the day and successful schedules since November 26, 1964, and have also called without success. established RTTY on 2m. GI3JKO/P (G3JK0/5N2AAF) did not have much luck in We also learn from the same issue of QST that a new Northern Ireland, and wishes he had taken gear for 4m and 21,000 Mc/s record has been made. This took place on 10m. Having operated in Derry, Antrim, Armagh, Tyrone October 24 last between W2UKL/2 (about 21,900 Mc/s) and and Fermanagh with only very few QS0s, Mike was some- WA2VW1/2 (about 21.957 Mc/s) from a high point in what discouraged, and says that even GD3FOC, who was Schenectady. NY, to Mt. McGregor, a distance of slightly worked most evenings, complained about the lack of over 27 miles. Q5 copy was achieved in both directions on activity. In fact, anything over 100 miles is exceptional. phone and tone-modulated telegraphy. Operating as GI3JKO/A from GI6TK on 4m, seven stations G2CUZ reports that the Ainsdalc Radio Club held its were worked in five minutes. expedition to Westmorland on April 18, which coincided In contrast, during the previous week when operating as with the RSGB Region 1 V.H.F. Contest. An early start G3JKO/P on 2m from Sussex, Middlesex, Rutland, Derby- was made, and the party arrived at about 08.00, where shire, Notts and Leicestershire, there was no difficulty in G3FNQ was already waiting. Three more arrived later, to working stations each evening. In the Midlands, only a make a total of 10 operators. Tent and aerials were soon up, Halo was used generally, but it was easy to work at 100 miles and the first 2m QS0 was made within two minutes of distance. switching on. The 2m gear comprised G2CUZ's home We learn from QAV Newsletter that conditions during the transmitter and modulator running from a TT pack and 144 Mc/s Portable Contest were above average. Although I2V generator, with a 6 element beam. The 4m gear was the AERE-ARC worked only one continental (F9XG) they G2DQX's, with two Ti' packs and a converted HRO fed called several PAs and ONs and in all 108 stations were from a vibrapack. The aerial was a 4 element, and extra gear worked in the nine hours (G3NNG-46. G3TEL-25, in the form of two B44s was available. Activity was much G3LIZ-15, G2HI F- I 4 and G3ROC-8). There were very few heavier on 4m than on 2m, but they had a very enjoyable gaps in operation. day in spite of afternoon storms, with snow, hail, thunder and lightning. There was unfortunately no real DX, the Four Metres best on 2m being Wales and South Cheshire, and on 4m GB3LER is now in continuous operation from Lerwick Shropshire and Montgomery. Afternoon activity on 2m (Shetlands) in synchronism with the 10m and 2m trans- was bad, even though 4m was going strong. On 2m, G3AOS mitters. The station may be heard on 70.330 Mc/s. but if so could be heard (off the back of his beam) calling Midland this is only temporary whilst a new crystal for the intended stations, but these were not reaching Westmorland. How- frequency of 70.305 Mc/s is awaited. GM3LTP will ever, all are keen for more, and there will be another trip appreciate reports on the reception of this new transmitter. later. To assess the performance of the gear, reports will His address is c/o The Observatory, Lerwick, Shetland Is. be welcomed from anyone who heard them but was unable G3XC (Indian Queens) finds some improvement on this to make contact. band. G2AYQ, G2BH W, G3AET and G3RBS all have The UBA National Station ON4UB now transmits on Pye Communicators operational. These arc used either 145.35 Mc/s (formerly 145-045 Mc/s). UBA requests that mobile or from fixed QTHs. with whip or vertically polarized amateurs keep this frequency clear on Sundays from 09.30 dipoles, so that /M visitors to Cornwall may be able to make to 11.00 GMT while official transmissions are being made. a few contacts. G3XC has 25 watts and a sensitive Nuvistor The station also works under the call ON5XA when exercises converter behind a 4 element Vagi. Fixed operation is not are arranged by the Belgian National Emergency Network contemplated as permanent, as the equipment was built in collaboration with the Belgian Red Cross. (from IARU for portable operation. Region I Bulletin, April 1965). G3OCB (Truro) thinks that the s.s.b. 145.1-145.2 Mc/s sub-band would result in less QS0s for remote s.s.b. stations News and Views such as his. When stations are beaming s.w. they search the Harry Wilson, El2W, on an Easter visit to the Near East. I.f. end carefully. By the time they reach 145 Mc/s, if at all, found Jerusalem to be a potentially ideal location for v.h.f. probably only local stations are heard and it is assumed that operation. The position is 2400 ft. a.s.l. and not the least of there is no one replying from the s.w. The proposed Zone its other advantages lies in the fact of numerous temperature is a good idea for well populated areas, but it is felt there inversions due to hot days and cold nights. All it appears to should be no criticism of s.s.b. stations in remoter areas who need, in fact, is a population of active v.h.f./u.h.f. operators. choose to adhere to the band plan. Harry's itinerary will have included Egypt, Libya, Jordan, the Lebanon and Greece, and we shall doubtless hear more of his trace's when he gets home again. In the meantime he asks to be remembered to all v.h.f./u.h.f. friends. G3JGO (Slough) sends particulars of the CF2 144 Mc/s 432-434 Mc/s ACTIVITY NIG HT TVI filter, manufactured in the USA. If there is anyone interested who cannot cure this trouble, the writer will be SATURDAYS at 7 p.m. pleased to pass on the address of the makers. It is claimed

RSGB BULLETIN JUNE, 1965 397 Scottish V.H.F. Convention Past President replied. The toast to the visitors was proposed by J. Fraser Shepherd, GM3EG W, Zone G Representative HE City Hotel in the ancient borough of Dunfermline on Council. and T. P. Hughes, GM3EDZ, President of the T was the scene of the Scottish V.H.F. Convention on Radio Club of Scotland replied on behalf of all visitors to Saturday. May 8, 1965. Dunfermline. The Chairman then asked Ray Hills, G3H R H. Despite gusting winds and heavy showers, over 70 people who was representing the Society as V.H.F. Manager, to gathered at 2 p.m. to listen to a lecture by C. E. Newton, say a few words, and then to present the Jock Kyle Memorial G2FKZ, on" Radio Aurora." He dealt with the mechanism Trophy to GM3IQL who received it on behalf of the by which aurora is created, and the results of the IGY and Dunfermline ARS, overall best performers in the v.h.f. IQSY auroral propagation investigations, for which G2FKZ field-day events among Scottish groups and clubs during is co-ordinator. One of the most interesting results explained 1964. The cup was filled with champagne by the Dunfermline was that due to the geometry of propagation by reflection at ARS and duly passed around the whole gathering to drink the auroral curtain, there exist limiting minimum and to their health and success! maximum distances for specific stations, and it is generally After the formal part of the proceedings was over, easier to achieve an east-west contact than on a north-south GM3EG W gave a short but interesting summary of the path. OSCAR Ill project, illustrated with tape recordings. The After a break for tea, the meeting listened to a talk and meeting was then thrown open to a general discussion on the demonstration by B. G. Taylor, B.Sc., GM3NZI, on " Low results achieved, during which several stations, including Signal Detection by Phase Correlation Methods." GM3NZI, G3FZL, G3H RH, G3CCH and GM3G Ul commented on who is engaged in research work at the University of Edin- the part they had played themselves. burgh, dealt with a method of detecting the presence of The dinner closed with the drawing of the raffle prizes. signals in the presence of large noise levels, by the generation which included a separate prize of a Joystick aerial presented of a local reference signal which locks to the phase and by Partridge Electronics in aid of the RA1BC for whom frequency of the incoming weak signal. The talk was over £5 was raised. illustrated with a simulated working demonstration. The event, organised by A. Lawrence, GM31QL, Secretary The meeting then broke up for informal discussions, and of the Dunfermline ARS, lived up very well to the standard some 50 present re-assembled at 6.15 p.m. for dinner, at set by earlier Conventions held in Glasgow and Edinburgh. which H. G. Henderson, GM3AEY, Chairman of the and, as Geoff Stone remarked, the opening of the new Forth Dunferm!ine ARS, took the chair. After an excellent meal. and Tay road bridges should enable succeeding events to be the Rev. Walter Ferrier, GM3BDA, proposed a witty organised successfully even further north of the border. toast to the RSGB to which Geoff Stone, G3FZL, Immediate We hope to have photographs in the next issue.

satellite's transmitter failed on orbit 203 on March 24. At THE OSCAR STORY-Part III that time G3EDD had the band to himself. On orbit 237 on March 26 the telemetry signal was extremely loud and By W. H. ALLEN, M.B.E., G2UJ considerable noise was heard being radiated on the low frequency end of the translator band. In addition to the HE OSCAR Ill telemetry beacon on 145.85 Mc/s is still "normal" run of translated signals. GM3GU1 heard T operating well, with the battery voltage at a steady CO8HE on orbit 162 on March 21 when OSCAR Ill was II volts, as these notes are being written. A point of interest 41 west. Some doubt has been expressed on the authenticity was the sudden appearance of the tracking beacon signal on of CO8HE, but in the circumstances he might have been 145.95 Mc/s soon after the failure of the translator section. genuine. Other signals recorded at the same time included Both the beacon transmitters are of similar power output- K (or W) 4TFG, a VE3 and an American-sounding voice on 25 mW-but there is no comparison between the two signals. s.s.b. G2A0X reports hearing the signal on 145.95 Mc/s during The GB2RS News Broadcast will be carrying OSCAR Ill near passes and never more than some 2db above the noise predictions as long as they arc required, supplied as always level, whereas the telemetry signal can be received at strengths by G2A0X. The following information will be of assistance up to S7 or so when the satellite is on one of its more distant to those observers who wish to listen to the telemetry passes. It is now known that several satellites were launched signals: Period 103.51 minutes, daily change 9.14 minutes at the same time by the same rocket and it is possible that later and 5.4 further west every 14 orbits, and track separation Oscar suffered some damage to its aerials in the confusion. between successive orbits is 26.10° west. Further to the reports last month of stations heard via the translator, the following have since been received: " Dey " Retires G3NNG (Didcot), IIHC.1 and OH1NL on orbit 169 on March 21, G5ZT (Plymouth), DJ3EY, G3OST, I 1 EHC, F. J. Devereux, B.Sc., retired last month as Editor of SM5AIZ and SP3LQJ. Wireless World, after an association with that magazine GI5SJ, Belfast, logged 53 separate orbits between March which began in 1923. " Dev " served as an editorial assis- 12 and April 13 and identified the following translated tant under the distinguished editorship of Hugh Pocock and signals. The figures after the calls indicate the orbits on later under the equally distinguished editorship of H. L. which they were heard. DJ3EB (141), DL3F1JD (114), Smith. He became assistant editor in 1956 and was appointed DL3YBA (87,100), DL9GU (100), EA4E0 (115, 143, 162, editor in 1957. 170), G3LTF (114, 141, 142), G6AG (114, 115, 156, 162), For the past 20 years. or more, " Dev " has been a HB9RG (73, 87, 155, 156, 170), ON4FG (148, 162), SM7OSC frequent visitor to RSGB exhibitions and other functions (100, 101), VEITT (157), VE3YDA (157), WI BU (157) and arranged by the Society. WA2WEB (162). We wish him well in his retirement and thank him for the So far as GM3GUI, Friockheim, Angus, was concerned, help he gave to the Society during his long association with G3EDD was the last signal to be translated before the Wireless World. He is succeeded by H. W. Barnard, who has been Assistant Editor of Wireless World for the last eight • Project Oscar Co-ordinator, 24 Arundel Road, Tunbridge Wells, Kent. years. G6CL

398 RSGB BULLETIN JUNE, 1965 Society Affairs Brief Report on the April. 1965 meeting of the Council

MEETING of the Council was held on April 9, 1965, tions for transfer from Associate to Corporate grade were A at 6.30 p.m. and was attended by Messrs. E. W. accepted. The subscriptions of three applicants were waived Ycomanson (President), H. A. Bartlett. N. Caws, J. C. on the grounds that they suffer from blindness or are Foster. J. C. Graham, E. G. Ingram. A. O. Milne, L. E. disabled. Newnham, A. D. Patterson, J. Fraser Shepherd, R. F. Stevens, G. M. C. Stone (Members of the Council), John A. Affiliation Rouse (General Manager and Secretary), and P. C. M. Smcc The Council granted affiliation to: (Minuting Secretary). Battersea College of Technology Electronics and Apologies for absence were submitted on behalf of Messrs. Amateur Radio Society L. N. Goldsbrough. R. C. Hills. R. H. James, F. K. Parker, Government Communication Amateur Radio Club J. W. Swinnerton and L. Varney. Dunfermline Radio Society Havering and District Amateur Radio Club. Half-year Accounts Consideration was given to the accounts for the half-year Headquarters Accommodation ended December 31, 1965. It was agreed to enter into a new lease for the present Headquarters offices at an increased rent. When making this decision, duc consideration was given to the efforts being Recommendations of Committees The Council accepted recommendations relating to the made to purchase a suitable Headquarters building. RSGB 21/28 Mc/s Telephony Contest, 1964, and Affiliated Annual General Meeting Societies' Contest, 1965 (H.F. Contests Committee), the first 70 Mc/s and first 144 Mc/s Contests 1965 (V.H.F. The Council approved December 17, 1965, and December Contests Committee), to representation at the Scottish 9, 1966, as the dates of the 1965 and 1966 Annual General V.H.F. Convention in Dunfermline (V.H.F. Committee), Meetings. the RSGB International Radio Communications Exhibition RSGB News Bulletin Service 1965 (Exhibition Committee), to a Christmas Lecture for young people and a weekend course at 011erton, near The appointment of additional newsreaders for the London area and Northern Ireland was approved. Newark (Educational Committee). The Council also approved a number of recommendations submitted by the Finance and Staff Committee in connection Reports of Committees with the Norman Keith Adams Trust Fund, claims for The Council received reports on the meetings of the follow- expenses by members of Committees, staff matters, and ing Committees: increased subscription rates (a statement in connection with Membership and Representation (5.2.65), Scientific Studies the new subscription rates, which will apply from July I. (5.2.65), V.H.F. Contests (10.2.65, and 10.3.65), H.F. Con- 1965, appears on page 365.—Eorrox). tests (11.2.65, and 11.3.65), Education (13.2.65). Technical (1.3.65), Mobile (4.3.65), V.H.F. (8.3.65), Finance and Staff Membership (15.3.65) and Exhibition (26.3.65). The Council approved 202 applications for membership • • (154 Corporate and 48 Associate). In addition, 15 applica- The meeting ended al 10.50 p.m.

Affiliated Societies The following Societies are now affiliated to RSGB: THE AUCHENHARVIE AND DISTRICT AMATEUR RADIO CLUB: glI11111111111111111111111111111111111111111111111111:1110iiii11111111:11111itiiicilt1111111111111111111111inionnuniiiiiiiiiiiiiiiiiiiin C/O B. N. Robertson, II Hillcrest Drive, Stevenston, GB2RS SCHEDULE Ayrshire. RSGB News Bulletins are transmitted on Sundays in accordance HOWARD HOUSE (BRUNSWICK) BOYS' CLUB: with the following schedule: C/O S. L. Del-Roy, 30 Belsize Avenue, London, N.W.3. Frequency Time Location of Station 3600 kcis 9.30 a.m. South East England Representation 10 a.m. Severn Area The following is an addition to the list of Affiliated Society 10.15 a.m. Belfast 10.30 a.m. North Midlands Representatives: 11 a.m. North West England NORWICH AND DISTRICT RADIO CLUB: 11.30 a.m. South West Scotland O. F. Simkin, G3HYJ, 15 Hillside Road, Thorpe St. 12 noon North East Scotland Andrew, Norwich, Norfolk, NOR 48T. 9.30 a.m. Beaming north from London 10.00 a.m. Beaming west from London The following are additions to the list of Arca Represen- 145.8 Mcfs 10.15 a.m. Beaming south from Belfast tatives: 145.30 Mcjs 10.30 a.m. Beaming north west from Sutton Coldfield BARNSLEY & DISTRICT: 11.00 a.m. Beaming south west from Sutton J. WALKER, G3GNK, 23 Locke Avenue. Barnsley. Coldfield Yorkshire. 14550 MO 11.30 a.m. Beaming north from Leeds NORTH BERKSHIRE: 12 noon Beaming east from Leeds C. Sharpe, G2HIF, 20 Harcourt Road, Wantage. News items for inclusion in the bulletin should reach Head- Berkshire. quarters not later than first post on the Thursday preceding trans- GREAT YARMOUTH & DISTRICT AMATEUR RADIO CLUB: mission Reports from affiliated societies and from non-affiliated D. L. Buddery, G3SEP, 72 Albany Road, Great Yar- societies in process of formation will be welcome. mouth, Norfolk. P.,;i1111111111111111111111111M111111111111111111111111111111111:1111111111111111111111111111111111111111111111111111111M1111111111111111111111111111111111111111111i1;

RSGB BULLETIN JUNE, 1965 399 RSGB Slow Morse Practice Transmissions

The following Slow Morse Practice transmissions are sponsored by the RSGB. Al "oils and additions to this list should be sent to the H y Organizer. M. McBrayne. G3KG U, 25 Purlieu Way, Theydon Bois, Essex.

Tinto Coll-sign kcts Town Time Coll-sign Town

Sundays W ednesdays 08.00 G3KLT 827 Birmingham 20.00 ... G3ROX 1840 Wolverhampton. f G3KZZ 920 South Shields, 09.30 Staffs. G3TNF Co. Durham 20.00 G3SADJA 1980 Stevenage. Hens. 10,00 G W3TMH 980 Rhyl, Flints. 20.30 G3KGU 1920 Theydon Bois. Essex 10.15 G3CGD 875 Cheltenham 20.30 G3AGN 1875 Felixstowe 10.30 G131EX 860 Belfast (23H VI 1890 Stoke-on-Trent 11.00 G2FXA 900 Stockton-on-Teas 21.00t G3OGD 12.00 GM3HBY 903 Glasgow 21.00G 3LKT 1892 Salisbury. Wilts. G3HVI 890 Stoke-on-Trent G3PLQ 12.00 t{ G3OGD G3POU Doncaster, Yorks. 21.00 12.00 G3SVD 870 Reading, Berks. G3SFO 12.00 G3PAI 82$ Ongar. Essex. 18.00 G W3TMP 960 Mold, Flints. Thursdays 18.30 G3NCZ 920 Blackburn. Lancs. 18.00 G3S WR 1980 Middlesbro', Yorks. 19.00 G3NPB 875 Hexham, 18.30 G3NC 1968 Swindon Northumberland 18.30 G3TMI 1840 Canterbury. Kent 892 Salisbury, Wilts. 19.00 G3NUT 1875 Wallasey 21.00 t{e-t,1:2> 19.00 G3NPB 1875 Hexham, 21.30 ... G3NQR 875 Harrow Weald. Middx. Northumberland G2ATM 1890 Fleenor, Derbys. G3KTP Mondays G3OK X 18.00 ... G3SWR 1980 ... Middlesbro', Yorks. 19.30 ... t G3ONB 18.30 ... G3NCZ 1920 ... Blackburn, Lancs. G3RTO 18.45 ... G W3PMR 1920 ... Bangor. Caerns. (23 RUB 19.00 ... G3MXS 1875 ... Birkenhead G3R WN 19.00 ... G3NPB 1875 ... Hexham, 19.30 G3RFL 1910 ••• Great Harwood, Lancs. Northumberland 20.00 G3NHR 1900 Hounslow G2ATM 1890 ... Heanor, Derbys. 20.00 G3LLM 1820 •-• Bath. Somerset G3KTP 20.00 G5X13 1878 ••• Reading. Berks. G3OKX 20.30 G3RSF 1925 Harlow, Essex 19.30 t G3ONB . f G3KAD 1850 Swindon, Wilts. 20.30 ••• G3RTO ' 1,,G3LLZ G3RUB G3IRM 1981 Bury Sc. Edmunds l_G3RVVN 21.00 ... t G3M WO 19.30 G3SRY 1920 Cheers'. Surrey G3PH W 20.00 G31-1.1G 1980 Manchester . G3LKT 1892 Salisbury, Wilu. 21.00 20.00 G3113.1 1910 Southampton. Hants. ••• ' G3PLQ 20.00 G3PKZ 1930 London N.22 21.00 G3ADQ 1990 Bradford, Yorks. 20.15 G3SAZ 1845 Ashford, Middx. . f G3EVT 1865 Redditch, Worcs. 21.30 20.30 G3TOF 1925 Harlow, Essex - ' '1,G3T01 20.30 G3M1S 1980 Leigh-on-Sea. Essex. 22.00 ... G3A WL 1980 Wingate, Co. Durham G3IRM 1981 Bury St. Edmunds 22.00 ... G3LLM 1820 Bath. Somerset 21.00 G3M WO G3PH W Fridays • G3LKT ... 1992 ... Salisbury. Wilts. 21.00 18.30 G3NCZ 1920 Blackburn, Lancs. ••• ' G3PLQ ••• 19.00 G3RBP 21.15 G3ADQ ... 1990 ... Bradford, Yorks. 1860 Oxford 19.00 G3NPB 1875 Hexham, f G2BSW 1865 ... Studley. Warks. ••• 21.30 Northumberland 'L G3TB W ... 1865 Redditch. Worcs 19.30 G3P WU 1850 ••• Reading, Berks. 20.15 G3DXA 1845 Ashford, Middx. Tuesdays 20.30 G3TX1 1925 ••• Nazing, Essex 19.00 ... G3NPB 1875 ... Hexham, J.G3LKT 1892 Salisbury. Wilts. 21.00 ••• Northumberland '1G3PLQ 19.00 G3NUE •.- 144.26 Mcis Worcester 21.00 G3PKE 1920 Dorking. Surrey 19.30 1910 Great Harwood, Lancs, G3RZI 1865 Redditch, Worcs, G3RFL ••• 21.30 20.00 G3RZO ••• 1865 Radditch, Worcs. •" G3TQD 1865 Droitwich, Worcs. 20.00 1910 Southampton G3UCZ 1900 Pudsey, Yorks. G3P.11 •-• 21.30 20.00 G3AYJ .•- 1925 Birmingham t'L G3KSS Bradford 20.30 G3NKX 1915 Loughton 23.00 ... GM3HBY 1903 Glasgow . G3LKT 1892 Salisbury, Wilts. 21.00 Saturdays "• '. G3PLQ G2FXA G3HZG 1865 Redditch, Worcs. 13.00 900 Stockton-on-Tees 21.30 G3TNI 1865 Bromsgrove. Worcs. 11.00 G13.1EX 860 Belfast 14.00 (235 VO 22.00 G3A WL 1980 Wingate. Co. Durham 870 Reading. Berks, 15.30 G3RFL 910 Great Harwood. Lancs, 22.00 G3HZM 1925 Manchester 18.00 G W3TMP 980 Mold. Flints. 19.00 G3NPB 875 Hexham, W ednesdays Northumberland 8.30 ... G2FXA 900 Stockton-on-Tees 20.00 G3KPO 980 Peterborough 8,45 ... G W3PMR 920 Bangor. Caerns. 20.30 G3TLJ 925 Roydon. Essex G3G135 865 Moseley 892 Salisbury, Wilts. 21.00 G3G131 870 Redditch. Worcs. t {2P it G W3C1R 930 Newbridge, Mon. G3RBP 860 Oxford tAfternotely

Reports from listeners to these transmissions will be welcomed by the operators concerned.

RSGB BULLETIN JUNE, 1965 signals were therefore able to be tape recorded as well as heard by the audience in the FEE Lecture Hall. Letters to the Editor Sir, if anyone has by any chance one of the original S. G. Brown loudspeakers just described, it would be a fine patriotic Neither the Editor nor the Council of the Radio Society of Great Britain con gesture if it was offered to the London Science Museum, South accept responsibility for views expressed by correspondents. Letters for Kensington. The Museum informed me very many years ago inclusion in this feature should be concise and preferably not more than 200 that they were unable to trace a single genuine specimen. As the words in length. speakers were designed to operate with maximum efficiency on 300/1000 c/s they naturally gave poor results for broadcast music and were quickly superseded by the original Lodge patented RSGB QSL Bureau moving coil type. Yours faithfully, DEAR SIR,—It is, of course. common knowledge that the RSGB QSL Bureau handles the vast majority of cards for radio Guildford, Surrey. MAURICE CHILD, ESA ex-N WX, 2DC amateurs in this country, but there is at least one other organization which appears to claim an equal status with the RSGB. to which a not inconsiderable minority of amateurs, including. I am sorry to say, some RSGB members, are sending their cards. Do We Talk Too Much? I do not know under what conditions this other organization offers its QSL Service or what if any are the charges made. DEAR SIR,—Listening around the a.m. 'phone bands, one reaches the inescapable conclusion that the average amateur What is quite obvious is that a large proportion of these cards talks too much. received by this other Bureau are just passed on to the RSGB Why cannot he conduct his rag-chew 'phone QS0s (in which for delivery. Quite recently, several thousand cards, including up to 30 he is fully entitled to indulge if it so pleases him) more on the cards from a single call-sign. were delivered by this other lines of a land-line conversation, as the s.s.b, boys are more wont to do. instead of hogging the microphone until the last organization, late in the evening by private transport to my home. We had cleared the Bureau for the day but to avoid a pile up with possible moment when, after vainly casting around for something more to say, he has, in desperation, to pass the transmission back the next day's post, my wife and f had to get down to the job of sorting them until well after midnight. Had these cards been to the other man, who by this time has either fallen asleep from sent direct to the RSGB, they would have come with the ordinary sheer boredom, or completely forgotten most of the points about post. spread over a period. which he would have liked to interject a comment if given the There is no way of judging how long some of these cards had chance? been waiting at the other Bureau, but the delay must have been Why, having asked a question. cannot these gentry have the courtesy to stand by for a reply, instead of promptly proceeding considerable. If the senders had used the RSGB service direct they would have been better served, instead of, presumably. to ramble on interminably on some totally unrelated subject, and paying one organization and having the work done by another. from that to another one, and so on. ad nauseanr—apt word! The RSGB service is free to members and I suggest that every The crashing bores who are addicted to these monologues seem mainly to inhabit 160m and 80m, though they are by no means amateur in this country should belong to the RSGB. This is the exclusive to those bands. Is it so very laborious to switch from only organization with the power and facilities to look after this interest properly, and he should therefore avail himself of the " send" to " receive." or are these egoists so in love with the sound of their own voices that they just cannot bear to relinquish Society's service. Yours truly, the mic, having once got it into their hands? A. O. MILNE. G2MI Help to improve our " image " by keeping the covers short, RSGB QSL Bureau Manager chaps! Yours faithfully. A. C. W. BIDDELL, G3GN M Said Long Ago Kenton, Harrow, Middlesex. DEAR SIR,—The reference to the first presidential lecture and demonstration by Mr Campbell Swinton in 1914 (page 173 of March issue) recalls to my mind one or two historical matters ORA Locator Maps associated with the reception of signals from the Eiffel Tower DEAR SIR,—Mr. Bastow's letter in the April issue of the station, and which are not generally known. BULLETIN calls for a reply to point out that the QRA Locator The jamming of the Paris message was only partial, for the system of location was devised by v.h.f. operators as a rapid preliminary signals came through clearly, as did a few words in and easy means of establishing position. and is not intended to termination. supplant the orthodox, but nevertheless cumbersome, longitude- Mr Campbell Swinton. in anticipation of a possible hitch, had latitude method. previously asked me to arrange a short transmission from my If Mr Bastow possess a QRA Locator map of N.W. Europe College station (ECX) at Earls Court which operated. in contrast (5s. 6d. each direct from RSGB Headquarters) he will be in a to Paris (FL). a sharply tuned wave of 450 metres and a spark position to pin-point in a matter of a second a station anywhere frequency of 1000 cycles. This wavelength was well below that in this area to an accuracy of ±2 km. This system of identifica- of the Admiralty and was received clearly, without interruption. tion lends itself admirably to contest work and in this context the and signals were perfectly recorded. V.H.F. Contests Committee can check distances at the rate of 25 It should be remembered that in 1913/14 there were no three contacts per minute. electrode valves; even the diodes were of the soft vacuum variety A point which Mr Hills. G3H1214, omitted in his splendid and extremely unpredictable as to life and reliability. article on the QRA Locator system in the March issue of the Among the Society's early members we had the exceptionally BULLETIN was the scale of the QRA Locator map, which should gifted Mr S. G. Brown, whose famous 8000 ohms adjustable A be 25 km per centimetre, or approximately 40 miles to the inch. type headgear 'phones produced double the output of the best Yours faithfully. iron diaphragm types then in use. I. C. FOSTER. G2JF But Mr Brown did not stop at headgear telephones, for the Chairman, V.H.F. Contests Comndttee same basic principles of construction were adapted to the Ashford, Kent. manufacture of a unique loudspeaker having a straight upright cone in place of the more usual gramophone trumpet. Further more. the Brown range of sound producing and amplifying The Bulletin instruments included three special relays, the A. B and C types. Mr Campbell Swinton's demonstration included the use of all DEAR SIR,—For the past year I have been a member of the three relay types in series or cascade, together with the afore- RSGB and have been receiving the BULLETIN. May I compliment mentioned loudspeaker. Thus, instead of headgear 'phones. he you on its policy and contents. Particularly I approve its used the microphonic A type relay to amplify the rectified output " state-of-the-art " approach. and I look forward each month to of the crystal h.f. tuned circuit. The output of the A relay something of real value to me. Keep up the good work! operated the more robust B type which energized the loud- Sincerely yours, speaker, but in addition also energized the type C moving HUBERT WOODS, %%MK make and break type which operated a Morse printer. The Northfield, Illinois.

RSGB BULLETIN JUNE, 1965 401 worked G30XD/A at 205 miles, and the club station G3JWT/A (Marconi Apprentices. Chelmsford), with a first ever entry, worked PAOHN/P at 225 miles. G3PMH, the CONTEST NEWS March and District Club station, worked F3LP (Le Havre) at 210 miles. Of special interest is a contact made by G3PQR RESULTS REPORTS RULES (Clacton-on-Sea) with G60X. 83 miles away, for G3PQR was only running an input of 2.5 watts. Comments from contestants are acknowledged with thanks and will be noted for future events. The Contests Committee is grateful for check logs receil. ed from G3EHR and G3CH W. Second 144 figs Contest (Open) 1965 The leading position in this contest is filled by Harry Listeners' V.H.F. Contest Gratton, G6GN (Bristol). who scored a fine total of 10,747 points accumulated from 131 contacts. In last year's event The leading contestant in this event is R. A. Ham. he was placed fourth. In second place we find the Albright BRSI5744 (Storrington, Sussex). who was in the seventh and Wilson club station, G30XD/A (Oldbury, Birmingham). position in the same contest last year. A. W. Blandford, with a score of 10,509 points from 163 contacts; the highest BRSI8572 (Mitcham, Surrey), who was second last year. number of QS0s in this event, and 32 more than the winner! repeats his performance again this year. Third position goes Third place is taken by Brian Armstrong. G3EDD (near to D. A. R. Poulter. A4048 (Morden, Surrey). Cambridge). Brian was twelfth in last year's event. Con- gratulations are deserved by aU three leading stations. RESULTS Position Name Contacts Aerial PoMts It is worth noting that no adverse comments on the scoring 1 R. A. Ham BRS 15744 109 4/4 2325 system were received and, despite the extra work involved 2 A. W. Blandford BRS18572 77 8 ele 1780 in making out log sheets, the total entry is considered quite 3 D. A. R. Poulter A4048 112 8 etc 1710 4 M. Vincent A3470 70 8 ele 1650 satisfactory. Judging by the number of stations active during 5 G. W. Rolland A3766 95 5 ele 1590 the contest, one can assume that there is still plenty of interest 6 G. Swan A3696 71 6/6 1500 in these events, even when taking into account the low entry. 7 D. J. Barlow A3768 58 6/6 1140 8 J. T. Eden A3604 62 4/4 1130 In fact it would appear that even if these events were to be 9 J. K. McHugh BRS26476 53 4 etc 1110 organized solely for creating activity, they would be worth- 10 M. Harrison BRS24733 70 5 ele 945 while. 11 A. A. Goacher A3942 52 4 ele 795 12 D. J. Reid A3993 45 dipole 555 A perusal of the contest results shows that the honour for the longest distance contact should go to G3PNA It is interesting to note that G. W. Rolland and G. Swan (Redhill), for a QS0 with PAOZR/A at 230 miles. GI3SLI occupy the same positions that they occupied last year, namely fifth and sixth. Propagation was about normal and RESULTS the general opinion was that conditions and the contest were Position Call-sign Aerial Power QS0s Pointa quite enjoyable. (watts) I 0665 6/6 80 131 10,747 :i G3OXID/A 616/616 75 163 10.509 Correction G3EDD 4 x 6 ele 120 125 9744 4 G2AU D 2 Y 10 ele 100 125 7796 During the First 144 Mc/s C. W.-Contest (Open), 1965. 5 G3TR 10 ele 90 146 7684 G3NOH/P operated from a site 8 miles south-west of New- 6 G3SHK 10 ele 65 150 6686 bury. Berks. and not from Wolverhampton. Staffs, as GLITW/A 4/4 100 110 6583 7 G3TLB 4/4 25 124 6456 reported in Contest News on page 254 of the April issue. 8 G3PNA 6/6 70 110 6083 9 035.10 6/6 90 82 6063 10 G W3RUF/P Sete 50 75 5848 11 G3AGN 6/6 60 64 5679 D/F Qualifying Events 12 G3SWB 8/8 90 116 5603 Details of the Wirral Qualifying Event are as follows: 13 G3SHZ 10 ele 110 129 5492 6316E 10 112 5028 Sunday, June 27, 1965. G3PM H 6/6 25 59 4571 Organizer: J. K. Birch. G2FOS, 19 Lloyd Drive, Greasby. Upton. 14 G2CDX 4/4 28 70 4112 Wirral. Cheshire. 15 G3SLG T.S. 25 89 4008 Map: Ordnance Survey, New Popular Edition. sheet 109. 16 G3PTM 616 35 85 3960 Assembly: 13.00 BST for first transmission at 13.20 BST. 17 03FIJ 2 Slots v R 25 64 3959 Location: Thornton Hough. NOR 330381. 18 G3LAS 10 ele 90 87 3783 Entries and Tea: Intending competitors should notify the 19 G3NE0 5/5 75 53 3315 20 G31)GP 5/5 10 47 2829 organizer by June 21 stating the number in their party requiring 21 0303E 6/6 25 80 2810 tea. 22 G2BHN 3 ele 45 42 2568 23 G3TCG 6/6 120 52 2352 Details of the Salisbury Qualifying Event are as follows: 24 GC2FZC 4/4 60 16 2016 Sunday, July 4, 1965. 25 G3SFV 6/6 35 46 1976 Organizers: Sir Evan Nepean. G5YN, and A. C. A. Newman, 26 G3AHB 6/6 80 80 1657 27 G3RZG/P 6/6 10 29 1424 G2FIX. 74 Victoria Road, Wilton. near Salisbury. Wilts. 28 G3FNM 515 40 43 1423 Map: Ordnance Survey. Sheet 167. " Salisbury." 29 G2BLA 6/6 12 42 1327 Assembly: 13.00 BST. 30 080M 5 ele 72 25 1297 Location: 100 yards west of Stonehenge. NCR 121421. 31 G3EKP 5 ele 15 25 1286 Entries and Tea: Please notify the organizers as soon as possible 32 G2WS 4/4 80 30 1217 stating the number in the party requiring tea. 33 GI3SLI 10 ele 10 8 820 34 G3PZF 5 ele 20 30 806 35 G3PQR 2 ele 2.5 21 704 Details of the Oxford Qualifying Event are as follows: 36 G5UM 4/4 7 27 698 Sunday, July 18, 1965. 37 0310 W 818 12 15 616 Organizers: M. P. Hawkins and E. L. Mollart. 17 Spinfield 38 G3OZH 5 ele 20 25 601 Mount, Marlow. Bucks. Map: Ordnance Survey. sheet 158. " Oxford and Newbury." • Multi-operator suttion + No signed declaration 1 in. to 1 mile. : Member of the V. H.F. Contests Committee Assembly: 13.00 BST for first transmission at 13.20 BST.

402 RSGB BULLETIN JUNE, 1965 Location: NUR 545826 on the " Fair Mile" mile N.E. of similar to the v.h.f. models, with the serial no. 0402; one Lowbury Hill. The point may be approached from King- Pye u.h.f. receiver, type la, measuring 171 in. x 6 in. x 12 in. standing Hill on the A417, and although the track is rough for with a grey panel and bearing the serial no. F.0901; a table the first I mile, it can be negotiated easily with careful driving. Frequencies and Call-signs: To be announced at the start. microphone in blue and chrome; a Cosser transmitter T. 109, Entries and Tea: Intending competitors should notify Mr E. L. serial no. 154; a Cosser receiver R.109, serial no. 436; and Mollart as soon as possible slating the number in their party a line linking unit serial 104. If anyone has any information requiring tea. on these units, or is actually offered them, would they please inform the Police as soon as possible. The total value of the First 70 Mcis Contest 1965 above equipment is about £1,000. It is regretted that G3OHH's entry was omitted from the table of results published on page 338 of the May issue of the Edinburgh Electronics Exhibition BULLETIN. G3OHH should have been shown in fifth position in Section A. On Saturday, June 26, George Watson's College Radio Society is holding a " Careers in Electronics" Exhibition at the College, Colinton Road, Edinburgh 10. Admission will Region I V.H.F. Contest be 2s. and Is. For the first time this year a contest for 70 Mets and 144 In addition to displays and demonstrations by leading Mcis has been held for the members resident in Region 1 manufacturers, an exhibition station will be active on all (i.e. North West England and the Isle of Man). This was bands under the call-sign GB3G WC. done at the suggestion of and organized by the Ainsdale Group. We are pleased to announce that the winner is Geoff Appeal for Rare Drugs Barnes, G3A0S, who operated exclusively on 2m. Ainsdale Members are reminded that the policy of the British Red Group itself, which staged an expedition especially for the Cross Society is not to accept requests for rare drugs from event, split its scores, putting in separate entries for 2 and 4m individual radio amateurs even when such requests are and came close behind with the 4m entry. G3PLX is third passed on to them via the police authorities. The British Red on a basis of his combined score. All contestants have been Cross Society recommend that when a United Kingdom advised of the results in detail. amateur is asked by a foreign amateur to accept a message for a rare drug he should advise the sender to contact his Stolen Radio Equipment National Red Cross Society. During the last nine months, several items of expensive Only requests from, or through, National Red Cross radio equipment have been stolen from wireless stations in Societies, can be dealt with by the British Red Cross Society Yorkshire and North Lincolnshire. It is possible that some and any drugs obtained would be sent to the National Red of this equipment may be offered to radio amateurs, and Cross Society concerned. descriptions are therefore given here: two Pye v.h.f. transmitter-receivers model 2702, in blue hammered finished cabinets measuring 2(4 in. x 18 in. x 14 in. deep, bearing the serial nos. 2025 and 2348; one Pye u.h.f. transmitter-receiver, V.H.F. Rotator (Continued from page 378)

- CONTESTS DIARY - passed up through one pulley, two or three times round pulley PI and down through P2. The centre of the turns June 4-7 - CHC/FHC/HTH QS° Party- around the big pulley was anchored with a wood screw and June 12-13 - National Field Day (see page clamp. 119, February, 1965). At G3PTB the 2 in. tube is boltedio the side of a telegraph- June 27 - Wirral D/F Qualifying Event type wood pole but it can equally well be free-standing and (see page 402). guyed to the three bolts in the top flange. A counterweight July 3-5 - Venezuelan Independence (4 lb. distemper tin full of sand) is attached to one end of the Contest (Phone). cord and the other end taken to a small hand-winch at the - Fourth 144 Mc/s Contest July 4 operating desk. (Portable) (see page 339, The wooden pulley should be well soaked in wood pre- May, 1965). servative and all moving parts very liberally greased before July 4 - Salisbury D/F Qualifying Event erection. The aerial array is of course fixed to the protruding (see page 402). length of 1 in, tube which should be of just sufficient length July 17-18 - 1296 Mc/s Tests. to enable the array to clear the cross arm etc. In one model July 18 - Oxford D/F Qualifying Event it was found that the 1 in, tube tended to bend at the point (see page 402). where it emerged from the top bearing. It was therefore cut July 25 - Third 70 Mcis Contest (Port- just above this point and an 18 in. length of j in. conduit or able). water pipe driven half into each part to provide reinforce- August 1 - Slade 13[F Qualifying Event. August 14-15 — WAE Contest (C.W.). ment. September 4-5 — Region I IARU V.H.F. Contest. For those with suitable rotating motors, the modifications September 4-5 — V.H.F. National Fluid Day. to enable the motor to be mounted on a suitable cross-arm September 11-12 — W AE Contest (Phone). September 12 — 80m Field Day. are obvious. In the current version the transmitter of a September 19 — D/F National Final. Derby. Desynn type beam position indicator is mounted on the September 25-26 —21/28 Mc/s Telephony/Receiving Contest. cross arm and driven by Meccano sprocket wheels suitably October 2-3 — WADM Contest (C.W.) October 9-10 — Raynet Rally. mounted and linked with Meccano driving chain. October 16.17 — 7 Mcis DX Contest (Phone). The mechanical construction has proved sound enough October 23-24 — CQ World Wide Contest (Phone). to keep a 4-over-4 slot-fed array aloft and had an 8-over-8 November 6.7 — 7 Mt/a DX Contest (C.W.). mounted on it at one time. It is felt that this design fulfils a November 13-14 — Second 432 Mc/a Contest. November 20-21 — Second Ili Mre Contest. need for a simple rotating device which is remarkably cheap November 113-29 — CQ World Wide Contest (C.W.). to make and far easier to construct than the length of this December 5 — Fourth 70 McPi Contest mew' article might suggest.

RSGB BULLETIN JUNE, 1965 403 Forthcoming Events Details br Inclusion in this feature should be sent to the appropriate Regional Representatives by the first of the month preceding publication. A.R.s and club secretaries are reminded that the information sub mitted must include the date, time and venue of the meeting end, whenever possible, details of the lecture or other event being arranged. Regional Rep (natives are requested to set out the copy, preferably typed double spaced, in the style used below. Standing instructions cannot he accepted.

REGIO N I REGIO N 3 REGIO N 6 Ainsdale (ARS).-June 9. 23, July 7, 8 p.m., 77 Birmingham (Slade).-June 11 (" Tapespon- Cheltenham.-First Thursday in each month, Clifton Road, Southport. dance "-tapes from Catalpa RS, Birmingham, 8 p.m.. Great Western Hotel, Clarence Street, Blackburn.-Fridays. 8 p.m., West View Hotel. Mich., USA), June 25. 7.30 p.m.. The Church Cheltenham. Revidge Road. House. High Street. Erdington. Blackpool (8 & FARS).- Mondays, 8 p.m.. (South).-June 17, Friends Meeting House, (Morse tuition from 7.30 p.m.). Pontins Holiday Moseley Road, Birmingham. REGIO N 7 Camp, Squires Gate. Cannock (CCARS).-July I. 7.30 p.m.. The Acton, Brentford & Chiswick (ABCRC).- Bury (BRS).-June 8 ('• Amateur Radio Pro- George Inn.Walsall Road. Cannock. Ju-e 15, 7.30 p.m., AEU Club. 66 High Road, cedure esplained." by G3ETU). 8 p.m., Old Coventry (CARS).-Mondays. 8 p.m.. Westfield Chiswick. Boars Head (private room). Crompton Street. House. Radford Road, Coventry. Ashford (Middx.) Echelford ARS.-June 9, 23, Chester.-Tuesdays. 8 p.m., YMCA. except first Dudley (ARC).-Fridays. 8 p.m.. Art Gallery, 7.30 p.m.. Links Hotel. Ashelrd. Tuesday in each month. Dudley. Bexley Heath (NKRS).-Ju ,e 10 (NFD Brief- Crewe 8, District. -June 7, July 5, 8 p.m.. Redditch (EWARG).-June 10 (Lecture and ing). June 24 (Inquest on NFD). 7.30 p.m.. Earl of Crewe Hotel. Nantwich Road. Demonstration on Printed Circuits), July 8 Congregational Hall, Chapel Road, Bexley Eccles (E & DAC).- Tuesdays. 8 p.m., Patricroft (W1BB Tape Lecture). 8 p.m.. Redditch Old Heath. Congregational Schools, Shakespeare Crescent. People's Centre. Park Road, Redditch. Barnet (BRC).-June IS. 8 p.m.. Red Lion Hotel. Patricroft. Eccles. Every Thursday, Club Top Salop (ARS).-June 10. 7.30 p.m., Morris Hall. Barnes. Band net at 20.30. Bellstone. Shrewsbury. Chingford (Group).-June 18, Contact the Liverpool (L & DARS).-Tuesdays. 8 p.m.. Stratfor d- .pon-Avon (S-u-AARS).-Fridays. secretary. Loughton 2397. Conservative Association Rooms, Church Road, 7.30 p.m.. Masons Arms. Sanctus Road, Strat- (SRC).-Friday (except first). 8 p.m., Friday Wavertree. ford-upon-Avon. Hill House, Simmons Lane. Macclesfield.-June 8. 22. July 6. The George Stourbridge & District (ARS).-July 6 (Talk by Croydon (SRCC).-June 8. 7.30 p.m.. Black- Hotel, Jordongate. GI3GF). 7.45 p.m.. The Library, Foley Cottage. smiths Arms, South End, Croydon. Manchester (M & DARS).- Wednesdays. 7.30 Stourbridge. Dorking (0 8. DRS).-June 8. 8 p.m.. Wheat- p.m., 203 Droylsden Road, Newton Heath. W olverhampton (ARS).-June 28. 8 p.m.. sheaf, Dorking. Manchester 10. Neachells Cottage, Stockwell Road, Tettenhall. East Ham.-Tuesdays fortnightly, 7.30 p.m., 12 (SMRC).-Fridays. 7.45 p.m.. Rackhouse Com- Leigh High Road. East Ham. East Molesey (TVARTS).-First Wednesday munity Centre. Daine Avenue. Northenden. REGIO N 4 each month, Prince of Wales. Bridge Road. Morecambe.-June 2. July 7. 125 Regent Road. Derby (D & DARS).-June 2 (Surplus Sale), East Molesey. Preston.-June 8. 22 (all meetings start with a June 9 (Extra-ordinary General Meeting), June Edgware & Hendon (EADFIS).-June 14. 28. Morse practice at 7.30 p.m.), Sc. Paul's School, 16 (D/F Practice Run), June 23 (" Introduction 8 p.m., John Keble H. II, Church Close. Dean's Pole Street. to Colour Television," by Mr. R. E. F. Street), Lane, Edgware. Southport (SRS).- Wednesdays, 8.30 p.m., June 30 (" The Problems of Effluent and its Enfield.-June 17. B p.m.. George Spicer School. Sea Cadets Camp. The Esplanade. Treatment," by G. D. Kelsey, B.Sc.), 7.30 p.m., Southbury Road, Enfield. Stockport.-June 2, 16, 30, The Blossoms Hotel. Room 4, 119 Green Lane, Derby. Gravesend (GRS).-June 16, 7.30 p.m., RAFTA Buxton Road. Stockport. Heanor (H & DARS).-June 8 (Closed), lune 15 Club. 17 Overcliffe. Gravesend. Wirral.-June 2 (NED Discussion), June 16, (Visit to Notts. County Police Headquarters, Guildford (G & DRS).-June 21, 8 p.m., Guild- July 7. 7.4S p.m., Harding House, Park Road Eoperstone). June 22 (Surplus Sale), June 29 fcrd Model Engineering Society in Stoke Park. West, Claughton. Birkenhead. (Films), 7.30 p.m.. Heanor Technical College, Harlow (DRS).-Tuesdays and Thursdays, 7.30 Ilkeston Road, Heanor. p.m.. Mark Hall Barn House, First Avenue. Leicester (LRS).-Mcndays. 7.30 p.m.. Sundays, REGIO N 2 Harrow (RSH).-Fridays, 8 p.m., Roxeth 10.30 a.m., Club Rooms, Old Hall Farm, Braun. Barnsley.-June II (" Mobile Equipment" and Manor County School, Eastcote Lane, Harrow. stone Lane. Leicester. display by C. R. Plant, GSCP), June 25 (Ladies Holloway (G RS).-Mondays and Wednesdays Loughborough (LARC).-June 4 (SWL night- Night). King George Hotel. Peel Street. (7 p.m.. RAE and Morse). Fridays (7.30 p.m., E & H-conducted by L. Hellier. G3TED), June II Bradford.-June 12/13 (NFO), June 22 (NED Club), Montem School. Hornsey Road, London. (NFD finalization). June 18 (Construction), Inquest). 7.30 p.m., 66 Little Horton Lane. N.7. June 25 (AGM). 7.30 p.m.. Club Room, Bleach Catterick.-Every Tuesday and Thursday. 7.30 Hounslow (HA DRS).-June 14. 28. Canteen, Yard, Wards End, Loughborough. p.m.. Clubroom. Vimy Road. Mogden Main Drainage Department, Mogden Mansfield (MARS).-Fridayl.. 7.30 p.m.. The Durham.-June 3 (Constructional Competition). Works, Isleworth. New Inn, Westgate, Mansfield. June 17 (AGM), 8 p.m.. Bridge Hotel. North Ilford.-Thursdays. 8 p.m., 579 High Road. Ilford Nottingham (ARC N).-Tuesdays, Thursdays. Road. Durham. (Nr. Seven Kings Station). Room 3, Sherwood Community Centre, Northern Heights.-June 9 (visit to Manchester Kingston.-June 10 (" Integrated Circuits," by Woodthorpe House. Mansfield Road, Sherwood. Radio Society). Pine 23 (Junk Sale), 7.30 p.m., G. Padwick of SGS Fairchild Ltd.), Juno 24 W orksop (NN ARS).-Tuesdays, (RAE Class), Sportsman Inn, Ogden. (NYA). 8 p.m.. YMCA, Eden Street. Fridays Thursdays (Lectures), 7.30 p.m.. Club Room, 13 Scarborough.-Thursdays, 7.30 p.m., rear of 3 (Morse classes). 2 Sunray Avenue, Tolworth. Gateford Road, Worksop, Nous. Trinity Road, Leyton & Walthamstow.-June 15, 7.30 p.m., Sheffield.-June 4 (Audio and Hi -Fi Group), Leyton Senior Institute, Essex Road, London. June II (General Business Meeting), June 18 REGIO NS E,10. (General). June 25 (" Wave Propagation." by Bedford (B & DARC).-Second Tuesday, and London U.H.F. Group.-June 3 (" Technical R. M. Strickland, G8KB), 8 p.m.. 8 Sandbeck fourth Thursday in each month, Harpur Secon- Topics," by H. Standby). 7.30 p.m.. Bull & Place. dary Modern School. Horne Lane, Bedford. Mouth. Bloomsbury Way, Holborn. Spen Valley.-June 10, June 24 (Open & Final Cambridge (C 8, DARC).-June 11 (NED Pre- London Me mbers' Luncheon Club.-12.30 Meeting), 7.30 p.m.. Heckmondwike Grammar parations), June 12-13 (NED). June 18 (NFD p.m., third Friday in each month. See separate School. Inquest). June 22 (Visit to Luton Club). Fridays, advertisement, 7.30 p.m.. Club Headquarrers, Corporation Yard. Loughton.-First Thursday in each month, Victoria Road. 7.30 p.m.. Loughton Hall, (Nr. Debden Station). Haverhill (H & DARC).-June 12-13 (NFD). New Cross (CARS).- Wednesdays and Fridays. Mendays. 7.30 p.m. Members will be notified 8 p.m., 225 New Cross Road. London. S.E.14. of meeting-place as soon as arrangements are Norwood & South London (CP 8, DRS).- completed. June 19, Training Centre, Catford, London, LO OKIN G AHEAD Luton (L & DARS).-June 12-13 (NFD), June 15 S.E.6. (NED Inquest). June 22 (Debate on H.F. vs V.H.F. Paddington (P & DARS).- Wednesdays. 7.30 í September 18.-N W. V.H.F. Convention. with the Cambridge Club). June 29 (Construc- p.m., Beauchamp Lodge, 2a Warwick Crescent. October 10.-Manchester Amateur Radio tors' Contest), Tuesdays. 8 p.m.. ATC Head- London. W.2. Convention. Belle Vue. quarters. Crescent Road. Luton. Bed:. Purley (P & ORC).-June 18, 8 p.m., Railway- October I6-17.-Eighth Jamboree-on-the- Royston (R & DARC).- Wednesdays, 8 p.m., men's Hall (side entrance), Whytecliffe Road, Air. Manor House Social Club, Melbourn Street, Purley. October 27-30 -RSGB International Radio Royston, Herts. Reigate (RATS).-June 19 (Lecture by Green Exhibition. Shefford (S & OARS).-June 3 (Old Time Radio Ltd.), 7.30 p.m.. George & Dragon. Cromwell December 17.-11.5G13 Annual General Gear). June 10 (NFD Preparations). June 12-13 Road. Redhill. Meeting. (NFD). June 17 (NFD Post Mortem). June 24 Romford (R & DRS).-Tuesdays. 8.15 p.m., Details of Mobile Rallies are given (Demcnstration for young members. by P. RAFTA House, 18 Carlton Road, Romford. on page 385 Screeney), July I (Lecture). Thursdays. 7.45 p.m. Scout ARS.-June 17. 7.15 p.m., Baden Powell (Morse classes 7.45-8 p.m.). Church Hall, High House, Queens Gate, South Kensington. Street. Science Museum (CSRS).-June 15 (Informal

404 RSGB BULLETIN JUNE, 1965 Tunbridge Wells (WKARS).-June 11 (Film REGIO N 10 LO ND O N ME MBERS' show), June 25 (Audio night: demonstrations of Cardiff.-June 14 (Discussion on NFD), 7,30 p.m., LU NC HE O N CLUB members' latest hi.fi audio equipment), July 9 TA Centre, Park Street. Cardiff. 1" 430 Mcis Apparatus," by J. Gould), July 23 will meet at the White Hall Hotel. (Arrangements for club's entry in V.H.F. NFD). REGIO N 11 Bloomsbury Square, London. W.C. I 7.30 p.m.. " Culverden House." Culverden Park Bangor (UC N WARS).-Thursd tys fortnightly. at 12.30 p.m. on Fridays. June 18. and Road, Tunbridge Wells. Details from R. 5.30 p.m.. Dept. of Electronic Engineering. July 16. 1965. Trevitt, G6SSE/T. 28 Delves Avenue, Tunbridge University College of North Wales, Dean Street, Bangor. Details from the Honorary Wells. Telephone table reservations to HOL 7373 Secretary c/o this address. prior to day of luncheon. Visiting amateurs Llandudno (CVAetC).-lune 10 (NH) Final especially welcome. Meeting, followed by Open Night), 7.30 p.m.. REGIO N 9 Cross Keys. Madoc Street, Llandudno. meeting). 6.30 p.m.. Science Museum, South Bath.-lune 18.7.30 p.m.. Room 247, Fourth Floor. Prestatyn (FRS).-Last Wednesday in each Kensington. Main Building. Bath Technical College. month, 8 p.m.. Railway Hotel. Prestatyn. Sidcup (CYRS).-June 3, 7.30 p.m., Congrega- Bristol.-June 25, 7.15 p.m.. Small Physics Details from A. Antley. Fairholme. Fairfield tional Church Hall, Court Road, Eltham. Theatre. Royal Fort. Bristol University. Wood- Avenue. Rhyl. Slough (SARS).-First Wednesday ia each land Road. Sri' col 8. REGIO N 14 month, 8 p.m.. United Services Club, Welling- Burnham-on-Sea (B-o-SARS).-Second Tuesday Glasgow.-First and Third Wednesdays in each ton Street. Slough in each month, 8 p.m., Crown Hotel. Oxford Southgate 8. District.-June 10 (" TV) month. Christian Institute, 70 Bothwell Street, Street, Burnham.on•Sea. Glasgow. C.2. Cures." by Post Office TVI Dept.), 7.30 p.m., Carnborne (CRAC).-First Thursday in each Atlasta Lodge. Tottenhall Road, Palmers Green, month. Staff Recreation Hall, SWEB Head- REGIO N 16 London, N.I 3. quarters. Pool, Near Camborne. Basildon (BO ARS).-.1u se 15 (Post-NFD dis- St. Albans (Verolam ARC).-June 16. 8 p.m., Exeter.-First Tuesday in each month. 7.30 p.m.. (ussion). details from G3118. Hadley Road. Gecrge and Dragon Inn, Blackbcy Road, Exeter. Chelmsford (CARS).-July 6, 7.30 p.m., Marconi Sutton & Cheam (SCRS).-June IS, 8 p.m.. The Plymouth (PRC).-Tuesdays. 7.30 p.m.. Vir- College, Arbour Lane. Chelmsford. Details from Harrow Inn, High Street, Cheam. ginia House, Bretonside, Plymouth. G3LTF. Uxbridge.-June 14 (Film Show), June 21 Saltash (SADARC).-Alternate Fridays, 7.30 Great Yarmouth (GYRC).-Fridays, 7.30 p.m.. (Lecture by 1-Beam Aerials Ltd.). 8 p.m., Sc. p.m.. Burraton Toc H Hall, Warraton Road. the Manager's Orrice, the Old Power Station. Andrews Scout Hut. Salta*. Scuth Quay. Swanston's Road, Great Yarmouth, W elwyn Garden City.-June 10 (Planning South Dorset (SORS).-First Friday in each Details from G3HPR. V.H.F./N.F.D.), 8 p.m.. Conference Room, month. 7.30 p.m.. Labour Rooms, West Wales, Ipswich (IRC).-June 30 (" Radar." by G3NAZ). Murphy Radio. Bessemer Road. Dorchester. 7.30 p.m.. the Civic College. Ipswich. Wi mbledon eisi & DRS,.-June IL 8 p.m., Torquay (TARS).-Last Saturday in each month, Norwich (NARC).-Mondays, 7.30 p.m.. the Community Centre, St. Georges Road, Club HQ, Belgrave Road. Torquay. Club Centre. 140 Oak Street, Norwich. Details Wimbledon, London, S.W. 19. W eston-super-Mare.-First Friday in each from G3TLC. REGIO N 8 month. 7.15 p.m.. Vittoria Hotel, Weston- Southend (SDARS).-June 4. 18 (Surplus equip- Crawley.-June 9 (Informal). for details contact super-Mare. ment sale), July 2, the Executives' Canteen. G3FRV. June 23 (('lembers' evening). 8 p.m., Yeovil (YARC).- Wednesdays. 7.30 p.m., Park E. K. Ccle Ltd.. Priory Crescent, Southend-on- Trinity Congregational Church, 'field. Lodge. The Park, Yeovil. Sea. Details from G3NPF.

LONDON MEMBERS' CHANGING YOUR ADDRESS? Please inform Headquarters of changes of LUNCHEON address in the following form.

CLUB Name (BLOCK LETTERS PLEASE)

WHITE HALL HOTEL BLOOMSBURY SQUARE, LONDON, W.C.I Old Address

Members of the club, their XYLs and friends meet on the third Friday in each month at 12.30 p.m. The luncheon usually lasts until about 2 or 2.30 p.m. Call-sign, BRS or A No Table reservations should be telephoned to HOL- born 7373 prior to the day of the luncheon. New Address (BLOCK LETTERS PLEASE) Further details may be obtained from the Chairman, Mr A. C. Wilberforce, G21 Y, " West Water," Mill Lane, Walton-on-the-Naze, Essex.

Please return your last Bulletin wrapper with VISITORS, PARTICULARLY FROM your notification of change of address. Four weeks should be allowed for alterations to take effect. ABROAD, ARE ALWAYS WELCOME

RS G B B U LLE TIN JU N E, 1965 405 CLUBROOM A Monthly Survey of Group and Club Activities

For information on membership or activities of a particular club, please apply to the person whose call is indicated at the end of the item. Full addresses may be obtained from a Call Book.

Acton, Brentford and Chiswick RC, through the good offices of generation with 15 members under the age of 21, quite a propor- the Northern Fleights ARS, recently had an opportunity to sec tion of whom hold full tickets. Always interested in the off-beat and hear the slides and tape recording by WI BB on the subject subject, they recently had a lecture on Burglar Alarm Systems. of 160m DX working. (G3GEH)„ (G3TMI). Aldridge and District ARS has an interesting lecture promised East Worcs. ARC has been busy erecting its new club hut on a under the title - 30 watts on the L.F. Bands." Although mainly site 500 ft. a.s.l. and is now turning its attention to the interior. directed at the newcomer to transmitter practice, even those There is talk of arranging a barbecue for the opening ceremony versed in the art could possibly pick up a hint or two. (G3R1.11). which will make a refreshing change from smothering the Basildon and District ARC has its site selected for NFD. and building in champagne ship style. (G3HZG). the members are busy polishing key contacts. A programme of Echelford ARS found, as suspected, that the general talk and visits has been arranged for the months of July and August, and discussion on receivers proved to be most interesting. The main these will take the place of the normal meetings. With the conclusion seems to have been the very real advisability of co-operation of the local Education Authority, the society is having a full demonstration of any secondhand receiver, and not sponsoring an RAE course next winter. This course is open to to buy on looks alone. The club has recently decided to apply all interested persons. whether members of BDARS or not for a permanent licence for use during exhibitions and contests. (G31.18). (G3ATF). Basingstoke ARC has made Ted Willis (G60U) a life member Ipswich RC (previously known as the Ipswich and District to celebrate his 80th birthday. Behind Ted lies 45 years of Electronics Society) has been very pleased to welcome an influx Radio interest, and the club are proud to have him as a member. of licensed amateurs and SWLs in recent months. Future There will be no meeting in June. its place being taken by NFD programmes include a visit to a nearby TV station, talks on (G3A DV). radar, mobile equipment and transistors. (G3MUT). Bradford RS has been issued with the call-sign G3NN for the Irish Radio Transmitter's Society has been approached by the club station. (G30T0). Director of Signals as to the willingness of El amateurs to Bristol ARC has proved beyond a shadow of a doubt that participate in the operation of an Emergency Communications home construction of equipment is still as much a part of Network. Needless to say the Society found the response very Amateur Radio as it ever was, and moreover, that present day satisfactory. (El9U). standards are excellent. This conclusion was reached when its Keele University is joining the merry throng on NFD. while members attended, and took part in. a house warming party for on June 19. the society will have stations operational on 2m and the new Club House in the University settlement. (G3SX Y). 160m during the University Fete, Bromsgrove and District ARC is going from strength to Liverpool University ARS has had a change of QTH and hopes strength in membership, and has a very creditable list of activities to be active shortly on all bands from 160 to 10m. With a lair lined up. On June 26 a Social Evening is being held at the Ewe number of 08-- call signs on the strength. operation on 70cm and Lamb on the B4091 at Stoke Prior. (G2CLN). is also being contemplated. Caithness ARS has cleared the hurdle of its AGM and is now Loughton and District RS, in addition to being busy with all set for the year ahead, not to mention NFD. (G1113LIBK). NFD, is preparing for the Mobile Rally to be held at Loughton Cambridge and District ARC finds that one of the most Hall on June 26. Leading manufacturers will be exhibiting pleasant features of its activities are the visits made to other equipment and many attractions arc being planned for visitors. clubs, and inter-club events. Members went to the Shefford club (G3JBS). on May 20 for a special lecture and met fellow enthusiasts from Magnus RS had a three minute spot in the BBC programme Luton. Bedford and Stevenage. On June 22 they are Luton Regional Extra on April 9 when G31NK. G3TBM and G3TBK bound to join in a debate on h.f. versus v.h.f. talked about the way in which the club started and the contribu- Cheshunt and District RC. The second annual Field Day was tion which it makes to school life. Although so short, it is held on May I, when some 100 contacts were made on Top Band understood that this was a very good effort by those involved. and 80m. On 80 the power input was limited to 10 watts, hut (G3JNK). despite this they hooked DL2AF and El5A. (G3GBL). Manchester and District ARS has meetings planned for June 2. Cornish ARC has increased its subscription slightly with the 9. 16.23 and 30. New members and visitors are always assured of object of being able to finance extra activities. Such moves are a hearty welcome. (G3RTU). usually very unpopular, but in this case the membership seems Medway ARS's publication Marrs Newsletrer contains a to appreciate that you do only really get what you pay for. mathematical appraisal of the Gascoigne Antenna. After (G3NKE). struggling for four years with the contraption. the inventor is Coventry ARS will be back in the NFD event once again after now back on the air again-even though his Council has been an absence of many years. This will indeed be a welcome disolved. (G3011P). return. With we suspect his tongue in his cheek. G5GR suggests Midland ARS believes in planning well ahead. having meetings that as QSL means to give a receipt, then we should do just that. scheduled right up to the end of the year. Again looking to the As he observes, at least one would have a carbon copy to prove future, the members have been fortunate in securing better all the QSLs sent. (G3PQQ). premises into which they will be moving after the meeting on Crawley ARC is holding its annual Members' Evening on September 21. (G3JDJ). June 23 when club members will be showing items of home- Mid-Warwickshire ARS had its new premises opened by the constructed equipment. G3T1R has shown how DX on Top Mayor of Leamington on May 10. In addition, it has been issued Band should be worked by scoring an ace with WI BB. with the call G3UDN for the club station. (G3EHA). (G3FR V). Newark SWC is also housed in new premises. With a member- Crystal Palace and District RC has come up with a very good ship standing at 35. and meetings held on Mondays and Thurs- idea to give less experienced operators battle training for NFD. days. visitors and intending members are sure of a hearty In essence it is to operate two stations. one of which goes all out welcome. (G3TlV V). for scoring, while the other plods along in a more leisurely Newbury and District ARS found the April meeting under the manner. Quite what happens if the leisurely station beats the banner of" Any Questions?" a rip roaring success, even though, other we shudder to think! The club is to be congratulated on a in the end, the panel of experts included practically every very progressive approach. (G3FZL). member present. Subjects ranged from pre-war operation to East Kent RS has a very strong following amongst the younger current techniques including v.h.f./u.h.f. and s.s.b. (G3TEK).

406 RSGB BULLETIN JUNE, 196$ Northern Heights ARS has its fourth AGM behind it and a very full programme of events organized for the forthcoming 12 months. Especially laudable are its intentions to run demonstration stations at various events. (G341.1DiV). Peterborough and District ARS heard all about Radio Astronomy from W. A. Granger, F.R.A.S.. on May 7. a lecture which was thoroughly enjoyed by all. Meetings are held each Friday evening in the club shack at the Old Mill. London Road. Visitors welcome. (G3KPO). Plymouth RC has risen in hallo decade to a thriving centre of activity of which all their members can be justifiably proud. At the recent AGM. the new President. G5ZT. conjectured in plausible terms on Amateur Radio in 30 years time, and the coming of the first DXpedition to the Moon. Farfetched? We had better wait and see. (G3SVZ). Port Talbot Club. The annual Social was held on April 6 and attracted contingents from Cardiff. Swansea. Rhondda. LlanoIly. Carmarthen and Pembroke such is the popularity of the event. Full credit must be given to G W4CG who was the wizard behind the organization and smooth running of the function. The I dinner and dance of the Thanet Radio Society. From Radio Amateur Invalid and Bedfast Club now has 278 sub- left to right in the picture are G3BKT, G3D NR, N. R. Cramp, Aid. scribers, and while some of these are well wishers, this surely E. G. Butcher, G2MI, G2IC, G2JF, G3M D O G2AIW and G3BA C shows the strength of the club. One of their biggest headaches with a difference. The club is particularly pleased with the is the transportation of equipment from A to B. Right now they efforts of stalwarts G3BFP and G3EUE who upheld the club's have receivers at Oxford and Stoke-on-Trent which need to lind standing in the Affiliated Societies' Contest which resulted in the their way to Saxilby. Obviously they cannot grow legs and get club station G3SRC being placed third. (G3KGA). there under their own steam, so perhaps some Good Samaritan Sutton and Cheam RS has a high proportion of transmitting who realizes his good fortune in not being handicapped, and who members, but nevertheless a nucleus of keen SWLs is growing. can help out in this way, will get in touch with Frances (G3LWY). Having only just cleared the AGM. the Committee is now at Assistance like this is worth its weight in gold. work planning future events. (G3HQT). Roding Boys' Society recently held a very formal meeting with Stoke-on-Trent ARS will be operating two stations during the object of sorting out, and finding solutions to. some of the NFD. one under the call G3GBU and the other under the call problems which face the club. One difficulty was solved by the G3UD. Once this event is over, it seems as though a do-it- efforts of G3JIX, G3TAJ and G3UAJ in that they produced an yourself brigade is going to be busy as there is talk of redecorat- ex-GPO van for club transport. (G3JIX). ing the: clubroom front entrance. The club meets every Thurs- Reading ARS is holding its next indoor meeting on June 26 day evening at 8 p.m. (G3GBU). when the subject will be the design and construction of v.h.f. Verulam ARC members turned out in force for the Texas and u.h.f. equipment. Visitors from neighbouring clubs will be Mobile Rally and had a jolly good time. They particularly like especially welcome. Prior to this, the first Mobile Picnic will be the personal OSOs which such meetings make possible. and held at Childe Beale Trust pavilion. Lower Basildon on June 20. comment that those who do not take part are missing quite a lot. Talk-in will be on 160 and 2. For further information apply to On the subject of NFD. the club proposes to enter two stations the Secretary. (Giro Q). for the first time. (G3EKU). Reigate ATS made over 80 contacts at the" Get Pleasure from Wirral ARS was given an excellent demonstration of Amateur Leisure" exhibition organized by the Redhill Rotary Club. TV gear by GW6JGA/T with practical examples of closed despite wicked QRN which, as they say, seems to be the prevail- circuit working. They comment that his shack must have been ing difficulty when sites are in the centre of towns. An excellent very bare that evening. publicity handout was available to interested sightseers. At the Wimbledon and District RS now has an average attendance meeting to be held on June 19. Green and Davis Ltd will be figure of 30 which must indicate that it has arrived at a formula featuring their equipment. (G3NKT). for meetings which holds a little bit of interest for everybody. Saltash and District ARC have issued a Public Warning that Late in April members went in force to the Kingston club's G9B0 fully intends to go mobile. So that his path shall not be " Bangers and Mash" supper and had a thoroughly good time. interrupted we have heard via the grape vine that he intends to At the Wimbledon Hobbies Exhibition they put on a demonstra- use a Sherman Tank. Thus he can concentrate on the operating tion station. (G3RZN). without worrying about what is going on outside. Over hill and Yeovil ARC is giving thought to operating from an exhibition dale you'll find his trail—of destruction. Last touches arc being to be held in the town in July. Members are taking full advan- put to the club's mobile rally arrangements at Calstock on Whit tage of the club's new s.s.b. equipment which is being given a Monday. June 7. good airing. Visiting amateurs are assured of a hearty welcome. Slade RS held on May 2 what is believed to be the first 160/2 (G3CM11). D/F test in the UK. Three Slade and three Rugby teams com- peted. The Royal Observer Corps gave their full co-operation to HELP US TO HELP YOU the event by providing the site for the transmitter: all grateful Even if the club secretary does not hold a call-sign, when thanks are duc to them. All teams were home and dry in time forwarding information for this feature, please do include the for the fry-up of hot dogs. call-sign of a member to whom interested persons can apply for South Dorset RS had a joint meeting with Yeovil ARC in details of events and membership. It is essential that reports May. for a talk on colour TV by G5UH. reach us by the deadline dates given, otherwise, regrettably, they South London Mobile Club is holding meetings on June 5 and cannot be included. This feature can help to increase your June 19: the former will he a slide show, and the latter a membership, so supply as much information as possible. discussion on club affairs. particularly concerning plans for future meetings. South Shields and District ARC holds its meetings on Fridays • • of each week. The club's transmitter is operational on all bands Deadline for the .luly issue is June II. from 160 to 10. Morse and theory instruction is available to Deadline for the August issue will be July 9. SWL members at the weekly meetings. A number of outings are being arranged for the coming months. Preparations are well in hand for the Mobile Rally to be held on June II at Bents Park CHA NGES OF ADDRESS Recreation Ground. South Shields. (G3KZZ). Southgate, Finchley and District Group has a meeting planned Four weeks' notice is required to effect changes of for June 10 which should be of interest to every member without address. When notifying Headquarters, please give exception. The subject? TV1. A member of the GPO staff will the old as well as the new address. Advise changes be giving the gen. Visitors will be particularly welcome. For further details apply to G3TXA. promptly so that you receive every issue of the Surrey Radio Contact Club is holding its annual Treasure Hunt BULLETIN without interruption. on Wednesday. June 23. which this year promises to be a Hunt

RSGB BULLETIN JUNE, 1965 407 PUBLICATIONS MORSE COU RSES

1 ...1.1.11:1•11U1 11111111111111111111111111'111111111111;11111111111111111111111111111111111111'1"11!,1111111111111111111111'11111111111111111111111111111111111111111111111111111111111111111 M11111111111111111111111111111111q1111111111111111111111111111111111". I I, PANEL LETTERING TIES BADGES

Short Wave Receivers for the Beginner (Data) 6/6 RSGB PUBLICATIO NS Transistor Radios, Circuitry and Servicing The Amateur Radio Handbook (Third Edition) 36/6 (Mullord) 5/9 Radio Data Reference Book - - - - 14/- Amateur Radio Circuits Book - - - 8/6 Understanding Television (Data) - - _ 40/- Wireless World Radio Valve Data ((ee) - 8/6 Amateur Radio Call Book, 1965 - - - 5/9 3/6 Service Valve Equivalents (Fifth Edition) - - MISCELLA NE O US S.S.B. Equipment - - - - - 3/- 3/- G3HSC Rhythm Method of Morse Tuition Communication Receivers (Second Edition) - Complete Course with three 3 speed L.P. The Morse Code for Radio Amateurs (Third records books - - - - - 84/- 2/- Edition) Beginner's Course with two 3 speed L.P. records books 60/6 ARRL PUBLICATIO NS Single, Advanced (9-42) or Beginners (0-15 Antenna Book, 10th Edition - 18/6 w.p.m.) ; books 50/ - A Course in Radio Fundamentals 10/- Three speed simulated GPO test. 7 in. d.s. Hints and Kinks, Volume 6 - 10/ E.P. record 11/6 Mobile Manual for Radio Amateurs 23/6 RSGB Morse Instruction Tape (900 ft.) - - 35/- Radio Amateur's Handbook ((965 Ed.) 42/6 RSGB Morse Practice Tape (450 ft.) - - 20/- Buckram Bound - - - 50/- (both at 3¡- i.p.s., up to 14 w.p.m.) Single Sideband for the Amateur I8/- Easibinders, round backed, gold blocked, for Understanding Amateur Radio 18/6 RSGB Bulletin - - - - - 16/6 Call-sign Lapel Bars 5/6

C Q PUBLICATIO NS SHACK AIDS 23/6 Antenna Roundup - British Isles Two Metre Band Plan - 6d 23/6 CQ Anthology, 1952-59 - QRA Locator, Western Europe 5/6 I6/- CQ Anthology 1945-52 - RSGB Countries List If- 23/- CQ Mobile Handbook Panel Signs, transfers (Data) 24/- CQ New Sideband Handbook Set 1: Receivers, Amplifiers 3/9 I3/- Diode Source Book - - Set 2: Test Equipment 3/9 22/9 Electronic Circuits Handbook Set 3: White Wording 4/9 30/- RTTY Handbook - - Set 4: Black Wording 4/9 29/6 Shop and Shack Shortcuts - Decalet Panel Lettering Transfers- (Black or 19/- Surplus Schematics - - White) If-- I4/- Television Interference - Blick Dry Print Lettering (Letters and Numerals, Black) 2/6 EDIT ORS AN D ENGINEERS PUBLICATIO NS •Radio Handbook (16th Edition) - - - 78/- RSGB ME MBERS ONLY 'Transistor Radio Handbook - - - 42/ - Bound Volume of 1964 RSGB Bulletins (Vol. 40)- 25/- Car Badge (De Luxe with call-sign)*- 19/- (Postage on oxerseas orders 516 extra) A MERICA N MAGAZINE SUBSCRIPTIO NS Car Badge (RSGB Emblem with call-sign)* - 11/6 CQ (Cowan) Monthly - (p.a.) - - - 44/- Car Badge (RSGB or RAEN Emblem) - - 7/6 QST (ARRL) Monthly - (p.a.) -- 43/6 RSGB Tie (Maroon or Navy Blue Terylene)- 16/- Institutions, groups, etc. (p.a.) -- 50/- Stereo Block (RSGB or RAEN emblem) -- I0/- Pennant (RSGB) 12* long for car - -- 8/9 73 Magazine Monthly (p.a. - - - 30/- Call-sign Lapel Badge (with RSGB or RAEN Emblem)* - - - -- 6/ - BRITISH PUBLICATIO NS Call-sign Lapel Bar • - - -- 5/- Guide to Broadcasting Stations (lee) 5/6 6/3 Tie Clips (with RSGB Emblem) - - - 5/ - Log Book (Webbs) RSGB Lapel Badge (new 4 in. size), stud or pin Log Book, hardbound (Martins) - 18/9 fitting ------2/ - Manual of Transistor Circuits (Alullard) 13/6 Plastic Window Sticker (RSGB or RAEN Radio Amateur Operator's Handbook (Data) 5/6 Emblem) 1/3 Short Wave Radio and the Ionosphere (Wife) 12/ - • Delivery 6-8 weeks All prices include cost of packing and UK postage Cheques and postal orders should be made payable to the Society. Book tokens and stamps cannot be accepted.

RSGB PUBLICATIONS, Dept. B 28 Little Russell Street, London, W.C.1

RSGB BULLETIN JUNE, 1965 408 K. W. Corner No. 10 Mai° V

The K W 2000A SSB Transceiver and KW600 Linear amplifier are now in production and we are now busy clearing the backlog of orders. Place your orders now for early delivery as we are expecting plenty of export orders for this equipment. The KW HF-BAND LINEAR VESPA is coming soon—a new SSB transmitter 10-160 metres. Watch for further announcements.

A NE W VFO by GEL.OSO model 4/105 is now available. This has exactly the same physical dimensions as the earlier models but employs a crystal-mixer do circuit with excellent stability figures. Write for details. 172181122

BARGAIN COR NER. Owing to bulk purchases and in spite of GIVE rising costs we can offer the following: Kokusai Mechanical Filters ME455-10K 19.10.0 each 30% more power output C.D.R. Rotators TRI IA with Control Unit ... 112.10.0 each Tokai Walkie Talkies 28-5 Mc/s LI3.10.0 each The Rotators are very suitable for 2 and 4 metre Beams and che Walkie Talkies aro the high power 200m W model. Buy now while 10 dB lower intermodulation products stocks last. than any similar valve on the market ...

Write to us for our list of "Trade-in" equipment—Receivers AND THEY COST MUCH LESS, TOO! Transmitters and Keyers etc.

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K. W. ELECTRO NICS LIMITED The M-0 Valve Co Ltd Brook Green Works VAN G U ARD W ORKS Hammersmith London W6 I H.iAT 1-1 STREET, DARTFORD, KENT Telephone R1Verside 3431

'JOY' NE WS N O. 10 RADIO AMATEURS EXAMINATION We supply a special course of home study prepared Did you notice specifically for the Radio Amateurs" sound and TV Licence as issued by the G.P.O. It covers every aspect of the ZL4GA's Small Ad. syllabus—starting right from the beginning—so that no previous knowledge is necessary. The fullest details of the last month ? licence requirements. itself, are included, and the method of sitting the examination and applying for the licence is fully described. At the end of the Course. a We're repeating it complete series of specimen exam, questions with fully worked model solutions are provided—giving invaluable in case you didn't:— revision before students take the exam. We also provide full training for the Morse Code—including morse key, transistor audio oscillator and 12 in. L.P. practice record. This latter equipment is available separately from the FREE! Most days except Fridays 3501-3505 c.w. I wil present the first G stn. to make 2 way contact with me while Course if required. Our record of successes by our students for the Exam, is unsurpassed by any other we are both using indoor Joysticks with only the 8 ft. feeder (as supplied), I year's free subscription to N.Z.A.R.T. institute. We have been established for over 23 years and specialise in the teaching of radio subjects only. For full (this includes monthly issue of " Break In" and an up- details write NO W to address below. to-date ZL call book. This offer is not impossible, remember G5WP worked me on 3.5 m/c and gave me 569, CO URSES ALSO AVAILABLE FOR ALL EXA MS. during 1965 B.E.R.U. Contest, and I was using the AN D SUBJECTS IN RADIO, TV and ELEC- Joystick against the shack wall. Use the codeword TRO NICS including Grad.I.Brit.R.E.; CIT Y and " Joyin " and t will tune up my indoor Joystick immedi- G UIL DS CER TIFIC ATES, etc. ately for the qualifying 2 way contact. Who will be the first ? ? ? 73, Alan Frame, ZL4GA. POST N O W FOR FREE BROC H URE , To: British National Radio School, Dept. 12. Radio House, Reading Please send details of your courses, without obligation, to: PARTRIDGE ELECTRO NICS LTD NAME "Caisler House," (Dept. R), Prospect Road, Broadstairs, Kent ADDRESS Telephone: THANET 62335 I BRITIS H N A TI O N AL R A DI O SC H O OL

RSGB BULLETIN JUNE, 1965 .109 S.S.B. PRODUCTS DER BY "SP HIN X '' TX 160m, 80m, (40m). 20m. A bold solid JACKSON* punch signal on S.S.B. A.M., C.W. Mains input. Delivery by the big name in PRECISION components Return. £5 carriage paid. Precision built radio components are an important "DELTA " control unit. Suits any TX. Built in Co-ax C O. Plus 2 S.P.C.O. and make pair. Press to talk button contribution to the radio and communications etc. Mains 1,P. £7. industry. "NAPOLEON" S.W.R. bridge. 72-80 ohm. Sensitivity control. 500 micro-amp meter. Forward and ref. Power SW. Small, compact. O.

"C A N O N BALL " TX (60m S.S.B.IA.M.iC.W. IS to 2 mcfs. Site Be 6' 6. Xtal filter ex. spec. Quality speech. Quality product like the Sphinx is. Price £24. Requires 230v. D.C. 6v. 2A. or mobile 1/P. — — "SILPL U G " replaces 5 vrIt Valve Rectifiers. ISZ4. 5V4, GZ30, GZ32 etc.) has 4-1,000v. P.I.V. silicons etc. inside. 21 - high 11 - 01D —cool power with added punch. 39/6 each. 1/- P. & P. N O. 6/36 DRIVE Incorporating the Dual Ratio Ball Drive providing 36-1 Slow " RX 80 " RX modified and aligned for best performance drive and 6-1 Fast drive under one knob with co-axial control. on S.S.S.. A.M., C.W. Product det. etc. New. E53/10/.. Scale is calibrated 0-100 and an extra blank scale is provided for individual calibration. "B M 3 " mic. (filter for S.S.B. optional). £1. 2/6 P. & P. The unit consists of aluminium back plate, drive unit, scale, spare Suitable Stands. 10/6, 12/6. 31/6. 62/6. scale, transparent cover, hair-line pointer, escutcheon and knob. Fits in front of panel which may be any thickness up to r (or "D Y N A MIC'' mies. 2 types. Marvellous results on more by providing longer screws). 19?- Sphinx etc. Suits 5.5.11. rigs. (Stands extra.) HI or L-Z. Reduced from 7 gnu. to 951- each. — - — — - - - • It's reliable if it's made by Jackson ! Reconditioned CR100-118. CR100 de-luxe- 08. SX73— El 10. TCSI2 A.C. 1,P—LI2 etc. etc. DE R B Y JACKSON BROS. (LONDON) LTD. 7A EDWARD ST . 42909 Dept RS ., KINGS WAY WADDON , CROYDON , SURREY

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Just look at these features: Double conversion - product detec- tor - calibrated bandspread -S-meter 540 kcfs to 30 Mcfs in 5 bands - sensitivity better than 11) itv for 10 db SIN. Price: [99.0.0. NTS-313 matching speaker. £3.7.9. Terms: NCI9OX and NTS-3B, deposit 06.7.9. N619 Write now for illustrated leaflet

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JUST WRITE OR PHONE WE HAVE A N ATIO N AL FOR FURTHER DETAILS COMPREHENSIVE N CX-3 transceiver £168. 1.9 N C121 receiver 0.0. 8.3 STOCK OF — HIRE PURCHASE - NC77 X receiver E32. 8.9 SECOND-HAND NCL-2000 linear amplifier £255 . 10. 1 - PART EXCHANGE — EQUIPMENT HRO -500 receiver E606. 2.9 :2.1\15 CC©i. 21 VICTORIA ROAD, SURB1TON, SURREY

WO yards from Surbiton station Tel.; Elmbridge 2833 and Lower H ook 2000 Opposite Victor Value

410 RSGB BULLETIN JUNE . 1965 CLASSIFIED ADVERTISEMENTS PERSONAL PATENTS and TRADE N1ARKS. Booklet on request. Kings Patent Agency Ltd. (B. T. King, G5TA. Mem. WANTED RSGB, Reg. Pat. Agent).—I46A Queen Victoria Street, London, E.C.4. (Phone: City 6161.) 60 years' refs. YOUR PRICE PAID for BULLETIN prior to July 1964. QSL CARDS. G.P.O. approved log books, cheapest, best, Single copies and complete volumes, state price and postage prompt delivery. Samples.—Atkinson Bros., Printers, etc. SELL. G & D Mk. IV 2m Converter I.F. 28/30 Mc/s. Lore, Cornwall. Mint. Leak point one plus, TLI2 plus. Decca ffss. Mono METROPOLIS MINUS 12 MILES. GLORIOUS L.P. Head, Microlift. Best offer secures. Reply to Box No. EPPING FOREST AREA. LOUGHTON MOBILE K.7I99. c/o RSGB But.'Erw, 4 Ludgate Circus, London, RALLY, BCNU. SATURDAY, JUNE 26, 1965. E.C.4. NORTH WESTERN agents for KW Electronics. Green & WANTED.—All types of communications receivers, test Davis, Codar. Joystick, Electroniques. National and Eddy- equipment, tape recorders, amplifiers, etc. Prompt cash stone equipment supplied. Drake 2B RX £90. KWI60 £18. payment.—Details to R. T. & I. Electronics Ltd., Ashville Hcathkit" Apache," £75.—James-Stephens, 70 Priory Road. Old Hall, Ashville Road, London E.11 (LEYton 4986). Liverpool. (ANField 36021. WANTED. Eddystone 888A c/w "S" meter in exchange for KW77. Box No. L7203, clo RSGB BULLETIN, 4 Ludgate SITUATIONS VACANT Circus, London, E.C.4. WANTED IN GOOD CONDITION. BC22I LM14. Must A. T. & E. (BRIDGNORTH) LTD. be able to modulate with mains power pack and fully calibrated charts. Mr. R. Davies, 16 Tydraw Street, TELECOM MUNICATIONS Glamorgan. WANTED TO BUY ONLY. In reasonable condition. Installation & Commissioning Engineer handbook for type BC348 communications receiver. Gould. To be based on the works at Bridgnorth but to 287 Lidgett Lane, Leeds 17. Yorkshire. undertake several tours abroad each year. Experience WANTED Communications Receiver, also SSB Trans- of UHF/VHF Radio Link equipment essential as a mitter or Transceiver.—Box No. L.7207, c/o RSGB Bum I - basis to the training, which will be given at the Works. TIN. 4 Ludgate Circus, London, E.C.4. Apply for full details to: WANTED R2I6 VHF RX. with power supplies. Price. parties. G4ZU 10/15 Minibeam as new, £5.-80 Endsor Personnel Officer. Street. Manchester 16. A. T. & E. (Bridgnorth) Ltd.. ROTATOR and INDICATOR required. Must be mechani- Bridgoorth, Shropviiire cally sound. Sell CRI00/2. Good performer, clean. £15.— G3GEJ, 14 Brandies Road, Letchworth. Herts.

ENGINEERS, PHYSICISTS, DESIGN DRAUGHTSMEN

To keep up with our continued expansion. we need men qualified to H.N.C. or degree level for the following activities.

VALVE ENGINEERING Technical control and production of Therrnionic Valves. Cathode Ray Tubes and Microwave Devices.

PRODUCTION ENGINEERING Putting new valves into production and controlling costs of existing types.

ELECTRONIC ENGINEERING Design and operation of test equipment.

ADVANCED MECHANICAL DEVELOPMENT Design and Development of highly complex mechanical equipment.

We (tiler terms of service attractive to the men we need, and all applications will be treated confidentially.

Please mention any experience you may have had in the Valve or Electronics Industry, and head your letter with the activity for which you are applying.

The Personnel Manager, 629 The M-0 Valve Company Limited. Brook Green Works, Hammersmith, W.6.

RSGB BULLETIN JUNE 1965 411 SITUATIONS VACANT

PYE TELECOMMUNICATIONS LTD.

have vacancies in

CAMBRIDGE

T W O SHILLINGS&THREEPENCE V.H.F. ENGINEERS

JUNE issue, now on Experience of A.M. and F.M. Transmitters and Receivers essential. Some transistor circuit sale, includes Variable H.T. experience desirable. Men who have had training in the Services may be suitable. Excellent Supply, Beginner's Amplifier, rates of pay and good prospects for promotion. Principles of Laser Applicants who wish to seek a career with Europe's leading Radiotelephone manufacturers Operation, etc. should apply to:

Personnel Manager Pye Telecom munications Limited FRO M YO UR NE WSAGENT New market Road Cambridge.

Telephone: Tevershom 3131

M ULTITONE ELECTRIC CO. LTD.

require MINIMITTER SENIOR TESTERS for our communications equipment. A good theorotical and practical knowledge of radio frequency and audio AMATEUR equipment essential. RADIO * Staff position * Sick pay * Good salary. Minimum £875 p.a. • 3 wks. holiday

AERIALS * Free life assurance • 5 (lay week

Telephone for appointment CLE 8022 Ro il £5 + 46 post & packing)

BIRDCAGE Aerials for 2, 4, 10. 15 and 20 m. SERVICE ENGINEER (F.M. version illustrated) HORIZ ONTAL ''X" Aerials for 10, 15 and 20 m. required to cover Scotland. Fault finding experience MIN1BEAM Mk. III Aerials for 10. 15 and 20 m. on electronic and electro-mechanical instruments. 3-BAND "COMBO" Aerial for 10, 15 and 20 m. Clean driving licence essential. Please write in FB.5A. ''All" Wave Aerial for 10. IS, 20. 40 and 80 m. confidence giving details of present occupation and (has been used on 160 m.) MOBILE WHIP Car Aerials for use at road speeds of salary required to: 110 m.p.h. and above. Group Service Manager

Order direct from MINIMITTER (1964) LTD. Baird & Tatlock (London) Ltd., Albion Mows, Kilburn High Road, London, N.W.8 Blackhorse Lane, ( »Ida Vale 6588) Waltham:stow, London, E.17. Manufacturers of Specialist Aerials and Aerial Equipment for the Entertainment and Communication Industries.

RSGB BULLETIN JUNE, 1965 412 OFFICIAL APPOINTMENTS N. W. ELECTRICS TELECO MMUNICATIONS ENGINEER G3MA X Required by the GOVERN MENT OF UGANDA for PCR COMMUNICATION RECEIVERS with built in speaker service in Ministry of Internal Affairs (Police) on contract covering long, medium and S.W. (6 to 18 Mc/s). All tested before for one tour or 21-27 months in the first instance. Salary despatch and as new. Power requirements 2.50v. H.T. and I2v. L.T. (including overseas addition) according to age and experience LS 10s. plus 151., p.p. Modified for A.C. mains £2 extra. Components G.2DAF.MK2. T.X. VFO Coil Furmer. 4/9 plus 6d. p.p. in scale £1,188-£2,202 a year. Gratuity 25 per cent of total Jackson* C604. LI plus 1/- p.p. emoluments. Educational allowances. Outfit allowance £30. Range of Aluminium Chassis 2}" high S.A.E. for lise. Liberal leave on full salary. Accommodation provided at 72 & 300 ohm ribbon feeder, Flexible Conductors. 6d. yd., Post I/6 any. length. reasonable rental or hotel allowance in lieu. 75 ohm Super Aeraxial 200W 200 Mc/s 21) yd. reel LI, P.P. 1/6. H.R.O. spares and power supplies in stock, s.a.e. for list. Candidates. between 30 and 45 years of age, must possess Morse Keys. American Type 137 lead and jack plug. 5/.. p.p. 116. CLASS D WAVEMETER NEW. phones & spares LI 10s.. p.p. 7/6. a City and Guilds Final Certificate course 49 or equivalent Set of 4 valves for WI 191 Wairemeter 10)- plus 2/6 p.p. qualification with at least 6 years' practical experience 807 moulded valve holders 6/- per doz.. post paid. including installation and maintenance of fixed and mobile eau and 0.01 uF metalmite 1000 volt 6/- doz., post paid. API 14 Mullard transistors 4/6 each, post paid. V.H.F. equipment (A.M. and F.M.); H.F. medium and low API lf. Mullard transistors 4/- each, post paid. power S.S.B. and D.S.B. transmitters and receivers; Radio BY 100 800 P.I.V. 'SA 5/. p.p. 6d. teleprinter equipment; small diesel and petrol electric Westinghouse 105GR2 1.000 P.I.V. IA 7/- post paid. Quantity enquiries for che above Semiconductors invited. generating plants. Duties will also involve the supervision Low resistance phones 7/6. High resistance 15/, p.p. 2/... and instruction of local maintenance staff under training. Noise Limiter Kit for TCS receiver, store soiled. 5/- post paid. AR138 Mains standby and AVC/N.L. switches 4/. each. post paid. Apply to CRO WN AGENTS, M Dept.. 4 Mil!bank, TCS B.F.O. an with trimmer 455 Kcis. 316 post paid. London, S.W.1, for application form and further particulars, T.W. EQ UIP ME NT AVAILABLE stating age. name, brief details of qualifications and experi- Range of STA N DARDS & H.F. XTALS available ence, and quoting reference M2T/62331/RC. EDDYST O NE RECEIVERS A N D CO MP O NE NTS. CODAR, DEN C O. REPA NC O. etc. We welcome all onto,', n, however small. Stamped addros,ed envelope please. Ministry of Defence (Air Force Department) have 52 GT. A NC OATS STREET vacancies for CIVILIAN RADIO TECHNICIANS M ANCHESTER 4 at RAF Scaland, Cheshire, and other RAF Stations CE Ntral 6276 throughout the United Kingdom for servicing, repair, modification and testing of air and ground radio and radar equipment. Commencing salary according to age is £722 to £929 p.a., max. salar) SAVBIT ALLOY £1,067 p.a. Houses may be available for renting ai West Kirby. some 15 miles from Sealand. Apply to saves wear on Ministry of Defence (CE311(Air) ). Sentinel House. Southampton Row, W.C.I. or to any Employment soldering iron bits Exchange. The world-famous copper BIB RECORDING TAPE SPLICER loaded alloy containing 5 Gives a professional touch — cores of non-corrosive A handy precision tool allows EXCHANGE flux, that saves the solder- quick and accurate editing — ing iron bit. Ersin Multicore no wastage or post-editing EXCHANGE. Gcloso 0207 amateur bands only. Wanted. clicks. Can be mounted direct Communications receiver type AR88 or similar. QTHR. Solder is also available in on the tape deck. It uses all Telephone Mun 2795. G3NMQ Croydon. high tin quality alloys.60 /40 your odd lenOhs of tape. in 22 s.w.g. for printed 18/6 each EXCHANGE EUMIG PS IMPERIAL (projector with tape circuits, transistors, etc. coupler) and Portay Editing machine, total value £30, for '7 • best TX/RX offered. Cash either way. From B2 upwards! —Captain Millington, GW3JGM, Alyn Road, Fairbourne. THE HANDY DISPENSER BIB WIRE WIRE STRIPPER Merioneth. Easy to find in the tool box—simple to AND CUTTER SERVICES OFFERED use. Virtually a third Strips insulation hand for tricky sold- without nicking CASES, chassis, panels. ANYTHING in metal; send your ering jobs. 12 feet wire. cuts wire 5-core 18 s.w.g. drawings, for quote. Stove enamelled, hammertone, or cleanly, adjust- ERSIN MULTICORE plain, in any colour.—Moss Watson, 40 Mount Pleasant able to most SAVBIT alloy in a Street Oldham, Lancs. (Main 9400). thicknesses. continuous coil used Splits extruded I direct fro m free- plastic twin flex. FOR SALE standing dispenser. 2/6 each 3/6 each BAMBOO POLES FOR CUBICAL QUAD ANTENNAS, ETC. ALL SIZES. S.A.E. BRINGS LIST.—WHINES & MULTICORE SOLDERS LTD. EDGELER, BAMBOO PEOPLE, GODMANSTON, MHLTICORE WORKS • HEMEL HEMPSTEAD • HERTS. (130XMOOR 3636) DORCHESTER, DORSET.

RS G B B U LLE TIN JU N E, 1965 413 R. T. & I. ELECTR O NICS LTD. FOR SALE-contd. where equipment is fully overhauled EDDYSTO NE 840C, 500 kc/s-30Mc/s £48 (25/4 NEW A.E.I. TRANSISTORS. GT 41 (4 Mc/s), GT 42 (6 EDDYSTO NE 840A, 480 kc11- 30 Mc/s £35 (23/-) Mc/s), GT 45 (4 Mc/s), GT 46 (6 Mc/s) all at 2/6 each or R.C.A. AR880. 540 kcis-32 Mc/5 £60 (40/-) GELOSO G209 bandspread receiver E55 1301-) 22/- per doz. New Texas, G.E., etc. Transistors. 2N 706 at R.C.A.AR86D, soiled, but perfect working £50 140/-) 7/6, 2N 708 at I 0/-, 2N 2926 at 8/-, 2N 696 at 10/6, 2N 2713 R.C.A. AMBLE, 75-550 kcJs & 1.5-30 Mc/s £50 (40/-) at 8/-. Unijunction Transistors. 2N 2160 at 17/6, 2N 1671 MARC O NI CRI00, 60-420 & 500 kc/s-30 Plc/s. with noise limiter .. £25 (301-) at 30/-. Quantity prices for above available on request. EDDYSTO NE 940, 480 "kc/s-30 £100 (300 Manufacturers Surplus Thyristors. 5 amp type. 70 P.I.V. G.E.C. BRT432 Mobile Recr. £30 (ISM at 10/-, 150 P.I.V. at 10/-, 200 P.I.V. at 10/6, 250 P.I.V. at NATIO NAL. NCI20, 540 kc/s-30 Mds £30 (38/-) EDDYSTO NE $640„ 113-30 Melt - .•• £25 (25/.) 11/-. 300 P.I.V. at 12/-. 400 P.I.V. at I 5/-. 70 P.I.V. 100 HEATHKIT MO HICA N GC-I U, 611411tc/s-30 Mc/s £30 (20/-) amps at 75/-, IS 602, 200 P.I.V. 3 amp at 32/6. Octal Plug-in FIALLICRAFTERS S38D., 550 kc/s-30 Het% with Silicon Rectifiers. 4 200 P.I.V. at 8/6, 4 x 400 P.I.V. at BIS dial ".. £25 (20/.) GELOSO G207 B'spread Receiver ... £45 (30/-) 9/6, 4 x 600 P.I.V. at 12/6. 4 x 1000 P.1.V. at 15/6. Manu- K. W. VICEROY Transmitter .". ••• £135 Me/-1 facturers Surplus Silicon Rectifiers. 100 P.I.V. 10 amp at G.E.C. BRT402E, 150-385 kc/s &510kc/s-30 Me/s with 4/6 or 4 for I4/-, 60 P.I.V. 200 Mills. at 8d. each. 1000 crystal calibrator ..• ••• ..• ••• £60 130/.1 LABGEAR LG300 Transmitter c/w modulator & PSU [75 (40/1 P.I.V. I amp at 4/6. Surplus 2N 706 Transistors at 4/6 each. EDDYSTO NE 680X. 480 kc/s-30 Mc/s £85 130/. J. Birkett, 9 Steep Hill, Lincoln. Phone No. 20767. HA M HARLU ND SUPER-PRO. 1-3-40 Mc/s £50 140/. AYO TYPE 3 SIGNAL. GENERATOR 150 kc/s- GOVERNMENT SURPLUS Electrical and Radio Equip- £22 (lo!.) Brand New R.C.A. AR880 complete with manual. ment. Our new catalogue No. 16 ready now, 2/6 Post Free, spares, valves, and headphones £85 (40/-' cost refunded on purchase of goods over £2. Arthur Sallis As above, fitted "S" meter, one only £90 0/-i Radio Control Ltd., 93 North Road, Brighton. LAFAYETTE HE-30. 540 kc/s-30 Mc/s. NEW ... £35 r10/-) NATIO NAL NC-I09, 540 kc/s-40 Mc/s. c/w crystal calibrator (30/-) METALWORK.-All types of cabinets, chassis, racks, etc., VALVES. tyoe 813 ... LI/10/- (51-) to your own specifications.-Philpott's Metalworks Ltd. BRO W NS TYPE "F" headphones. new, 120, 2K and (G4BI), Chapman Street, Loughborough. 4K ohms .- " £3/4/. (2/9) TMK MULT1METER, model TP-55, 20,000 op. volt. NEW ... [6/11/6 (free) 19 SETS, complete with power pack, aerial tuner, control NATIO NAL HRO. Our full list of same sent on request (large stocks). boxes and connectors, £3 10s. Od., package and carriage RECEIVERS. Send s.a.e. for our Communications 50/- extra. 19 SETS ONLY £2 Os. Od., package and carriage Receiver list. over 30 types to choose from. 25/- extra. Sets untested but complete with all components. CARRIAGE for England. Scotland and Wales shown in brackets. 38 Mk11 with junction box, untested 20/-, tested and working TERMS: C.W.O., Approved monthly accounts, and Hire Purchase. 30/- P. & P. 5/- extra. New head sets 17/6 P. & P. 2/6. R. T. & I. ELECTRONICS LTD. ASIssille Old Hall, Ashville Road, London, E.I. ref: LEYtonstone 4986 Main Road Garage, Billericay, Essex. Phone: B'cay 297. CREED 3X TELEPRINTER, spare ink rollers, 45 and 50 baud governors, 5 reels of tape, excellent condition, £12 o.n.o. Would exchange for good quality oscilloscope. BXI TO WERS G3NPF. 130 Ashingdon Road, Rochford, Essex. SELF-SUPPORTING, TILT OVER. CRA NK SALE.-Cossor 1035 double-beam Scope, £20. Tele- UP AND DO WN printer type 3Y. £5. Buyer collects.-121 Norton Road. All Steel Electric Arc Welded Coleshill, near Birmingham. Hot Dipped Galvanized These towers have two or three teles- RACAL RA17 Communications Receiver, as new, £275. coping sections, winding up to 50 or 60 Four 81 IA new, £5. GELOSO mike M1110, £2. Pair 3BP1 feet. At the top is a Rotator Mounting CRTs with socket, unused, 35/-. Receiver inspection South Platform for a C.D.R. Rotator. The London. Box No. L.7209, c/o RSGB BULLETIN, 4 Ludgate sections hinge on a 6 ft. ground post Circus. London, E.C.4. with a winch to tilt the tower over to ground level for easy fixing and COMPLETE STATION FOR SALE. KW Viceroy Mark adjustment of Antenna. Hammarlund HQ 170, KW match SWR indicator, Will support 3 Element, 20 Metre Beam or Tri crystal microphone (cardioid), TA33 Antenna. CDR Band Quad Rotator (hardly used), complete with all cabling. In excel- Price: Complete with Ground Post and two lent condition and perfect working order, £230. Roy Winches Hodges, G3SUR, 71 Crescent Drive South, Woodingdcan, SO ft. TWO SECTION £120 DELIVERED Brighton. Tel: Rottingdean 2888. 60 ft. THREE SECTION £15,5 DELIVERED FOR SALE. G8K W trap dipole. Almost new. Complete with coax, £4 10s.-Box No. L.7210, c/o RSGB BULLETIN, 4 Motorised winch. Remote control raising and lowering of tower from shack. Fully automatic. Ludgate Circus, London, E.C.4. Adjustable height with limit switches. For A/C Mains only. Price: 149.0.0. Complete with shack EDDYSTONE S640 RECEIVER. Nice condition. Will control unit. deliver reasonable distance. £16. Wiltshire, 2 Gainsborough JAMES FARLO W Gardens, Weston, Bath. 49 MO U NT PLEASANT ROAD 52 SET, with p.s.u. and inbuilt Q multiplier. Good condi- CH IG WELL, ESSEX tion. Buyer collects. £5. 35 Riverside Close. Kingston, Tel.: Hainault 4546 Surrey. "Demonstration tower can be seen at my QTH" THREE SECTIO N TO WER& MOTORISED ELECTRONIC BUG KEYS TRANSISTORISED. SEND RAISING WINC H. PACKAGE DEAL. FOR LISTS. ELECTRONIC DEVICES, WELLINGTON £200 delivered. ROAD, CHELTENHAM.

414 RSG B B ULLETIN JUNE, 196$ FOR SALE (contd.) PETER SEY MOUR LTD.

EIGHT TRANSISTORS, seven diodes, recommended types, El-bug December Bulletin. Second-hand guaranteed. 25/- THE NE W S W A N 350 TR A NSCEIVER set. S.S.B.-Miniature 2465 kc/s crystals, B7G 466 keis crystals. Brand-new, £1 each. Box No. L7204, c/o RSGB IS N O W ON SHO W. FULL COVER AGE BULLETIN, 4 Ludgate Circus, London, E.C.4. 80-10 Mtrs. 400 W. P.E.P. For £205. DRAKE TR3 TRANSCEIVER, remote VEO RV3, Drake A.C. power supply, Drake Mobile I2v power supply. Shure P.S.U. £45, Send for details N O W1 mike. All equipment absolutely mint and perfect. Today's price £420. Will sell £290. Private sale, but no objection terms. Box No. L7206, c/o RSGB BULLETIN, 4 Ludgate s d. Circus, London, E.C.4. R.C.A. AB U LP/13. Fully rebuilt with p.v.c. wiring. Fitted with IF Gain. improved 8F0 injection for M. etc. CRYSTALS! CRYSTALS! 100 brand new and boxed. 115/240 sic Input. Complete with new cabinet ... 40 0 0 Leas cabinet ... 35 0 0 Brush 10X overtone cut, anything between 5 and 7 Mc/s. DIP OLE TRAPS covering 80 to 10 mors. Fully encapsulated 5/6 each. 12 Leslie Road, Winton, Bournemouth. w,th all fitting instructions. 75 a feed._ ... per pair 2 7 6 H ALL1CRAFTERS SX140 receivers, amateur bands only, 4000 WORDS German/English for hams, SW Ls, technicians! 80-6 metres. New . 30 0 0 Only 8/6 or I 1 IRC's: 0E9CZI, Christian Zangerl, Dorn- JAPA NESE ALL TRA NSIST OR electronic keyers, 240 ale birn, Austria. in put ... 16 10 0 RP40 FIELD- STRENGT H INI.DICAT ORS; Pleb. BARGAIN FOR CASH. Mint NCX-3 Transceiver. Home Sullt-in meter, telescopic antenna, and earpiece supplied -. 2 15 0 JAPA NESE MULTIMETERS, 1,000 copy. 0-15-150-1.000 V. built P.S.U. (neat). XTAL Calibrator. £105. (Berkshire). dc/ac. 0-100,000 ohms. 0.150 Ma. ... (P/P 1/6) 2 0 0 Box No. L7205, c/o RSGB ButLE--rm. 4 Ludgate Circus, BY100 . (11 1:. 6d.) (each) 4 6 London, E.C.4. K W 2000 Transceiver. New. Consult Pete for top trade ins. K W Vanguard 80-10. As new ._ . 40 0 0 HEATHKIT SBIO (US); all band driver with power supply. Labgear LG300 RF Section and PA 80-10 metres, with 81 ... 25 0 0 £25. Prototype TT21 linear with above, if collected. Stevens. Hallicrafters 5R150 Transceiver with all matching accessories 51 Pettits Lane, Romford. including A.C. and D.C. power units and mobile rack, etc.

FERO. MF/LF coils suitable mods, 11/6 each. Nova-tech We are now once more taking orders for the new NCX5 80-10 metres Pilot Pal D/F RX £21. Radiomobilc 100 car radio £14. with De Luxe specification. Leaflets supplied on request. A4300, 223 Rivermill, Harlow, Essex. Hire purchase available on equipment over £3S O 0 60 WATTS, 5 Mc/s. Transistors type 25012A for sale. Pair for £5. Box No. L7202, c/o RSGB ButiEnN, 4 Ludgate 410 BEVERLEY ROAD, HULL, YORKSHIRE Circus. London, E.C.4. Te/ephone: HULL 41938 (43353 ofter 7.30 p.m.) COMPLETE STATION FOR SALE. AR88LF S-meter manual, very good condition, £30. Kw Vanguard transmitter key microphone, low-pass, high-pass filters, £30. Buyers collect or will deliver 50 miles. Z-match ATU with dummy load, SWR meter and aerial relay. £4. DOW bug- key, £2. Dipole 8KW traps twin feeder. £2 10s. 23 foot vertical aerial base loading coils, £2. 30 foot vertical aerial, 14 foot whip, accessories. £2, Oilers for small 10 watt 40/80m. CO-PA transmitter, crystals power supply and key. Frequency meter 100/10 kcis oscillator. RSGB BULLETINS 1949/64. ()ST May 1958/59 and odd issues. Books. S.A.E. enquiries. All carriage extra. G2FQG. 2 Calder Close, Maidenhead, Berks. Telephone Maidenhead 27302 after 7.30 p.m. H.R.O. RX. 9 coils 28-30 me/s bandspread, good condx but needs aligning, No P.S.U. £12. CR.100 noise limiter and manual. A.V.C. line needs attention, £10. 813 valves (2). new. 40/- each. G3PKA, 44 Sparrow Close, RAF, Brampton, Hunts. PANDA CUB T/X 160-10m. £30. Minimitter Mobile T/X 160-80-40m with transistor P/Pack and 160m transistor • 6707 converter I.F. 1.5 Mc/s. £25. 1-1.R.O. MX 9 general coverage coils and some B/Spread with P/Pack and speakers, AIR r-- £25. Celoso converter 80-10m, complete with P/Pack I.F. 4.6 Me/s. £12. E.M.I. 3 in. Scope D.C. to 2.5 Mc/s, £18. DIELECTRIC 4 E.P.I. Scope C.R.T. (new) with Mu-metal screen, hood *t•-•1 I and base, £8. 100 watt T/X, 80-10m, P/Pack, modulator, TRIM MER table top in two units, £35. Power supply 500 volt at o% 1 300 mA D.C. 6 and 12 volt A.C. with separate 0-30 volt D.C. at 6-10 amps, £6. C.R.T. display unit, £1 10s. Top NO W OBTAINABLE WITH TERMINALS FOR PRINTED CIRCUIT MOUNTING band command R/X, 1-5 to 3 Mc/s, £3 10s. Celoso V.F.O. 4/101, £4 10s. Carriage extra on all above. Allen. 4 Carton Capacities Iron, 4 5-100 pf. Insulation Write for technical greater than 10.000 megohms. Power Factor details of these or any Ave.. Poynton, Cheshire. less than .001. Acetate dust cover optional. other Oxley product S.S.B. KW VICEROY Mk. 11. As new. £90; also Panda 120v O XLE Y DEVEL O P M E N TS C O. LT D. in perfect order, £35. G2CUG. C. Beardow. 146 Greenhill Avenue, Sheffield. 8. ULVE RSTON, LANC ASHIR E Tel: Ulverston 2567

RS G B B U LLE TIN JU N E, 1965 415 FOR SALE—contd. QUARTZ CRYSTALS TRANSISTORS SALE.—Dow-Key 52 ohm coaxial relays, new, boxed with Brar d New lit Grade 100 kcis (3 PIN) 151-. 220 volt AC coils. DK60, £4. DK60-2C, £5. DK60G, £5. dew 12,6 oC2o2 I5/- ORT115. 916 155 lels (ARSE) 1216. A.9114 91- 00205 19/11 ONT115• 15,4 DK60G-2C, £5 10s. SAE with enquiries. Box No. L.7208, 456 1(911 (HRO) APIlb 8ln MYNA 9,11 0083* 11/- c/o RSGB BULLETIN, 4 Ludgate Circus, London, E.C.4. 735 kc/s (ARIP3LF) 101-. AP116 8/- 0022 111/- 0084. 718 Twin 100 kcfs & 1 Mcts 2216 AP117 tlf- 00.15 12,- 00179 7/9 AP118 1716 nems 7/11 OCI71 816 CT53 SIGNAL GENERATOR, in good condition. £10, or SEND FOR LIST OF 600 ADT149 134- °Lim. 17/0 API39 111/8 TYPES 0044 9,- oc2s. 17$ 20711 15/- will exchange for BC22I. Ball, 14 Salisbury Road, Moseley. 0045 TO- 0075 . (i/- 207115 15/- 0071 6 4,- 00711 6 0035 . 15/- Birmingham 13. South 3264. 0070• aje °cop ocair 13/- VALVES 00201 151- 0082* 9/- AD140. 19/0 0E2114* 5/- RACAL RA17 in excellent condition, less than 100 hours • Matched pain. available Receiving. Transmitting Over running, £220. Sims, 32 Portchester Road, Fareham, Hams. 800 types at new low prices. ME W 90 PAGE ILLUSTRATED CATALOGUE 2/6 post paid B28 RECEIVER, £17. Type A Mark 3 Tranceiver, 80, 40, PAD 1008/9 HENRYS RADIO Ltd • Mon.—Sac. 9-6 p.m. 20 meters, £15. Withers 2-meter Converter, £7. All in 303 EDG WARE ROAD. LOND O N, W.2 Thurs. 9-1 p.m. good condition. Buyer collects. 9 Connaught Road. Weymouth, Dorset.

FOR SALE EDDYSTONE S640. Excellent condition. Preelaion made In our own work. Morn onimerelal quality halbhard Aluminium. unmodified, complete with 3-in, square external S-meter, BL A N K Two, Ulf./ or four aided £20 O.N.O. Parsons. 77 Southampton Road, Cosham, 8A3111 DAY SEUV it 8 of over ...81 different forme mode up to Portsmouth. CH ASSIS YOUR SIZE (maximum length 35% depth 41

8EN Li 1,illi 1(.1.1 sir. t r Eli Lit APLF:T3 or ord., eiraight away. workbag C.D.R. ROTOR. 110 volt, complete with transformer for cot total urea of nod. ri..ii r...iolied and referring to lal.le below. *bleb la for lour•obleil ehmode In In .....u. Aluminium. 230 volt and 17 yards 4-core cable and indicator, £15. 4a au. In. 411 1711 aq. In. 9f- 304 al. In. 13/5 Webster Bandspanner with M Mummer Mount, £6. Bracken- 80 am in. 1,51 01,0 au. tu. 161- 336 bet. In. 14/9 112 mi. In. 0141 040 eq. In. iiis 398 eq. In. 16;9 stat Model 12/20 Transistor P.S.11. £5. Poole, 10 Roberts 144 ai. In. 7/11 272 ,it. ta. 12/5 and pro rata Street, Rushden, Northants. I. a 1'. 31.1 Dlaeounta for quaiititioa. More than 00 14.11 he it Ita iloalc foe milers. FLANGES (I'. I. or ri Gil. per bend. LG50. TX £20. Geloso V.F.O. with valves, dial escutcheon— STRENGTHENED CORNERS 11- earl, corner. PANELS. Any elm up ti. 3 ft. at 3/3 .1. It. 16 owe. (18 aw g. 4f0), unused and mounted on chassis in TU5B case, £6 10s. Plan omit mid parking. Top bar:d command Rx, £4 10s. G3HGY. GTHR. Coy. 75010. H. L. SMIT H Si CO. LTD. 0117.281 105.51/, 1.09 1019. W.2 P.U) 6091/7895 C. & D. 2M15-20A 2 Metre Tx £20; TW 70cm Converter IF 12-14 Mc/s, £10; G. & D. 70cm Converter (needs attention), £4; J Beams 70cm 8-over-8, 30/-; Lavou Wavemeter, £3; or the lot, £35. G8AAF, 2 Fair View, School Lane, Seer INDEX TO ADVERTISERS Green, Beaconsfield, Bucks. Page AR88D. FB condition externally and electrically. Makers Avo Ltd. 353 Ayres. Brian J. 410 ' S" meter, Tools, Manual. Inspection any time. Reason 409 for sale given. £50 O.N.O. Prefer buyer collect. 20 Carr British National Radio School Codur Radio Company 356 Road, Higher Irlam, Nr. Manchester. Tel: Irlam 2580. Courier Communications 354 Data Publications .. 412 BC348, modified double superhet, with p/p, needs attention, Daystrom Ltd. 357 £4. Power packs, 450V 200mA, 15/-. 350V, 300V, 250V, 10/, Dodson-Bull Carpets Ltd. 358 each. Valves I2AT7, 12AU7, I2AX7, 6CH6, 1/6 each. Pair Farlow, Jas. 414 Henry's Radio Ltd. .. 416 6146 £1. Postage extra. T. Holbert, 19, Thomson Drive, Home Radio Ltd. .. 356 Currie, Midlothian. Imhof., Alfred, Ltd. .. .. 362 Jackson Brothers .. 410 AR88LF specimen condition. Best offer over £45. AR77 K. W. Electronics Ltd. Curer lii and 409 good condition. £25 o.n.o. Box No. L.721I, cio RSGB Labgear Ltd. .. .. 359 412 Buu.erm, 4 Ludgate Circus, London, E.C.4. Minimitter 1964 Ltd. .. Mosley Electronics Ltd. 364 M. O. Valves Ltd. .. 409 BUG KEY £2/10/-, 1 M/c crystal. 12/6. WANTED, Valiant Multicore Solders Ltd. 413 TX, G2ATD.-5 Sussex Road, North, Heath, Erith, Kent. Newnes, Geo. Ltd. 360 N. W. Electrics .. 413 .. 415 G3RKK double conversion RX. Monitor SPKR. Ham- Oxley Developments Ltd. • • P. C. Radio Ltd. .. • • .. 358 bands only. Separate powerpack. £22 o.n.o. Prefer collect.— Partridge Electronics Ltd. • - 360 and 409 Linthorne, 14 Rylstone Way, Saffron Walden, Essex. RSGB Publications .. • • • • 408 R. T. & I. Electronics Ltd. . • 414 KW VANGUARD with L.P. filter 10-160m, £40. Multi- Seymour, Peter .. • • 415 Elmac double conversion 7 band (10-1604- BC) mobile Rx. Smith, G. W. .S1 Co. Ltd. • • 361 Smith, H. L. & Co. Ltd. • • 416 Mains PSU, S Meter, handbook, £32. Aveley I2V to 300V S. S. B. Products .. .. 410 200mA PSU £8. Home-brew 160m mobile Tx, £3. Mobile Stratton & Co. Ltd. .. Cover ii control unit & S meter for above Rx, £1. Joystick £2. Tweedy. Jack .. .. 358 R.220, £3. Deliver 50 miles or carriage extra.—G3RSB. Withers. T. .. Cover ir Hull 642450 evenings. Z. & I. Am Services Ltd. Cover iv

416 RSGB BULLETIN JUNE, 1965 RSGB BULLETIN JUNE, 1965

K W-SOLE U.K. DISTRIBUTORS for 8 HA M M ARLU ND (est. 1 91 0)

K W M O DELS FOR 1965 K W 2000. SSB Transceiver, Mobile or Fixed K W 600. Linear Amp, PA 5726 K W 2000A. 5513 Transceiver (180 watts) K W 2000C. Commercial 4-chan. Tcvr. K W 77. Receiver—Triple Conversion K W " Viceroy." 5513 Transmitter K W " Vanguard." AM/C W Tx The KW Triple Conversion Super with many refinements ... and more to come...

Awarded Silver Plaque, International Radio Com munications Exhibition, London 1963 K W stock includes: Adaptors. Aerials. Airdux Coils. Beams. Converters. Filters SSB. Mechanical & Crystal Filters, Microphones. Mobile Whips. Nuvistor Plugs. Pi-Coils, Plugs, Receivers. Relays. R.F. Chokes. Rotors. Signal Generators. Sockets, SWR indicators. Towers. Transmitters. VFO's, Walkie -Talkies, Collins ' S ' Line Equipment, etc, etc. U.S.A. Equipment.

CDR Rotors and Control Units TRIIA recommended for 2M ... £14. 0. 0. AR22 thousands in use ...... £20, 0. 0. TR44 latest model ...... £37, 10. 0. HA M-M will handle a • Big Bertha '... £61. 0. 0. Carriage included. •

The KW 2000 SSB Transceiver, £170 NOW AVAILABLE NE W! 6146B Tubes 501- each. 2/6 P. & P. PSU A.C. and D.C. I 2v. £29 each Now Available on Short Delivery ON SHORT DELIVERY GEL OSO V.F.O's 4;104 & 4/IO2-V each £8.15.0 with Escutcheon and Dial

K W TRA NS MITTERS K W " Viceroy " S.S.B. Transmitter Mk IV with built-in Power Supply £156 (Additional -} lattice filter, a extra) K W500 Linear Amp. SOO watts pep., £78 10s. K W " Vanguard" A.M. and C.W. 10-80m. £i9.6.0 10-160m. C73.10.0 Kits also available. Send for details. Carriage extra

NEW IMPROVED 200m W MODEL TOKAI " Walkie-Talkie " all Transistorized Transceiver, TX and RX crystal controlled on 28-5 Me/s. Rang 3-4 miles, Ideal for Emergency Services. Mobile operation, Rallies, Beam adjustment, etc. Size 6r x 2r x l. Weight I{ lb. Complete with telescopic aerial, in leather case, with batteries EIS. 0. 0. each (plus SI- carriage and insurance).

EASY TERMS AVAILABLE—Importers of U.S.A Equipment. The KW -'Viceroy " SSB Transmitter (Mk IV) with many refinements

44 4. e JP . stmt. amer 'It I r. P ' TD IANGUARr W O W" I HEATH STREET, DARTFORD, KENT. Cables: KAYDUBLE W-Dartford. Tel. Dartford 2.5574

Printed in Great Britain for the RADIO SOCIETY OF GREAT BRITAIN, New Ruskin House. Little Russell Street, London. W.C.I by The Garden City Press Limited, Letchworth. Hertfordshire. iv RSGB BULLETIN JUNE, 1965

THE T W COM M U NIC ATOR

MOBILE FIXED

PORTABLE

L DESIGNED FOR THE DISCERNING AMATEUR A RANGE OF SELF CONTAINED TRANSRECEIVERS FOR 2, 4 AND 160m e All Transistor Receiver—Fully Bandspread. Efficient noise limiter. 1 watt output. e Transistor Power Supply with true Toroidal Transformer (12 volt • earth). e Transmitter 10-15 watts input with C.W. and high level modulation. P.T.T. control. e Contemporary finish and styling in matt black, grey and chrome. e Only 12 in. wide, 4,t in. high and 7 in. deep. VHF £69 160m £59. ALSO AVAILABLE—Transmitters, Converters, Receivers and Power Supplies. Write for full details of our Equipment. British made and proved the best. *CONGRATULATIONS to GW3RUF/P RSGB 70 Mc/s Contest. 1st with a Communicator!

T. WITHERS (Electronics) I5(b) GILBERT ST - ENFIELD - MIDDX. VV A a 26638

Please send all correspondence and Mail Orders to our Head Office at Z & I AERO SERVICES LTD 44A W ESTBO UR NE GR OVE, LO N D O N. W.2. Tel. PARk 5641/2/3. Retail Branch: 85 Tottenham Court Road. London. WI W hen ordering by Mail please add 2/6 in C for postage and packing. Tel: LANgham 8403 Minimum charge 2/-. Strictly cash with order. Regret no C.O.D. accepted.

032 .. T1I233.. 6/-• TRANSISTORS 082 .. 6/••• FULLY GUARANTEED RADIO VALVES 'T11 2321 71 - 0036 01- 11071 5•-• 0081173171- 00203 14/- 8•788 ., 71 PC00 - • I3/- 001 .. 6/- 6A8711.. 2216 10C2 .. 12 ,- TP2,1 • • 11/- 0 095 171- 01'72 /1,- 0083 6/- OC204 20/- 8794 .. 6/- 7037 .. 9/... 01,3 .. 3/- 6.11:6.. 41- 161)1 .. ..- TP2820 7/6 0C29 17/0 0073 111- 00133 12/- 00203 22/6 10301 e/- • . e/- 071 .. 14 - 11792 .. 3/- PCC84 .. 6/6 TTle .. 35/- ()Gyp /5/_, B og 6/ _. 0c1g0 Bra 01:206 ,,,, 16707 8/- °AVG . • Of- 073 • • 8/- 8798 • • 10 /- 707 -86 - 71- T771 • • 371- 0C36 13/- omit or- 00170 ii/- A7114 W- 106 .. 15- (111Ati .. 4,31099 27183.. 81- KI M.. 1St- UV., .. 11/- .. 101- 0042 Sr- 01'77 8/- 0C171 0/- A91 le 8.6 1171.84 .. 1080? 7/- 6BA7 .. 151- 10718 .. 9/- et- POC89 .. 11/- 126 . • 1 IF 0044 0/- m g 7/- 00200 10(8 AFILO 10'- 11110T 71- 6BEe .. ef- 1011 .. 7/6 BRAND PUN .. 10/-IIPCC189 I0/- 1/191 . • 11 /- OCR 8/- 0078D 71- 00701 20/- A7117 7,8 611110 .. 71- 101.011 111.37 .. 1716 70780 7 - 11.6 .. 17/- 101- . • 1 1-1851 . • 17 /6 0070 6/- M ild 71- 00202 1111- A7118 20!- IN8OT 8/- 6B76 .. 8/- 10P13 .. 12/6 61.38 .. 17/6 PC982.. 7/6 1.12111 .. 13/- R.C.A. 214410 10C4,31: 2N412 10e40) (each) 7:6 1•200T 8/- 68E6 .. 71- 101'14 .. 131- 33C•3 • • 616 DY86 .. 81- 8141 •. 8/- PC984 .. 8/- 1/289 • • 14/- R.C.A. se or two gvgio w ith ono 2B410 • _ 8; 1E4.. OF 61307.1 11/- 3/1L6taT 7/- u - 11/- 12A118.. z cc.. 14/- 2142 • • OF 78780 - - OF 8701 • • 1!/,- 0197114. 8/6: OETI13. 71-: OE 'CIT373. 20,-;ET875. fi•-; 1E5 .. 3/- 613E7 .. 1116 I 2AQ5 .. 7/- 39We • • BABC89 71- 21.91 .. 816 PC7801 10/- e- U407 • • le- (98T880. 12 ,6. 184 .. 3/- 611E8 .. 6/- 12AT%.. 8/- 35240 .. 4/- EAF.42 8/6 ELM .. 15/- 707802 10/- 11801 .. 181-, MICRO ALLOY: MAT101. We: MAT121. 8/6; T1166. 6;-. Hu .. 416 61187 .. 16/- 12AT7 _ 4/- 387.807 6/- 1111C33.. 71- 81.83 .. 8/- PC7803 10/0 U4020 .. UM ¡Tg _ 3/- glitin .. 9/- igR cg _ g/- 30A3 .. 12/. BBC41 .. 7/- 2186 .. 7/6 PC/108 131- UABLIO 6/- TRIODE PE1ITODE 68E8 ITOU?,. 61- 6BW7 .. DJ- 12AU7.. 91- » Be • 71- EBOBIL.. 6/6 21821.. 8/- PCL41.. 91- 1.1.6742 8/- 1113h gain A.P. Amplifier Valve, suitable for low dial', 1114 _ 5/- 6E88 .. 10/- 12AX7.. 6/- 001-6 • • 016 11111180 6/6 161131 .. 01- 901.112.. 7,1- UBC41 71- M u A.F. Amplifier. Details of circuit providing an 1115 .. 6/- 6031 .. 121- 12BA6 - 6/- 3601)60 231- E11783 76 81034 .. 9/6 PCL83.. 8/3 13B081 71- arena@ geln of about 300 with total distortion of .3",, Li u _ 7/-0 B4 _ 0/- 1211E6_ 6/- 301.60T 8/6 88789 6/9 21880 .. 6/6 PCI.84.. 8/- U.13760 CIO with phase splItter output Mom triode section) to feed o 1X28 • •• 71- 5,Clogt)A I7/- 1210/7_ 8/- 8302 .. 8/6 EBL1 .. 141- 2E81 .. 7/6 PC1.89.. 9f- 1.111989 7/- push•pull output sUsge. Send sae fur elreult. All 2(.19/4 .. 12/- tICII6 .. OF 12070T 3/- .. m g _ 12/- 61184 .. 8/- PC1.86.. 9/- 11911.21 11/- component. available. Valve 01018. 7.1.• each. 21)21 .. 81- 601.6 ,, 11/- IDAQ3 .. 33- 832 .. 20/- 8090 .. 2/6 EMIR .. 9/- PENES 6/0 U .. 9/- 11A4 .. 41- 6CW4 .. 12/- gon _ 13/- 934 .. 8/- ECC01.. 6/- ES67 .. 71- PEN46DD UCC83.. 7/- WIRELESS SETS No. 38 AIM 388 .. 71- 6D84 .. UV- 201.1 .. 14/- 955 • - 51- 110034 • • Ole 11731 - • 10/- 17 /- 88756. • 916 Small Weak-T..11de covering frequency range of 7.3.2 E M U.. 616 EN32 .. 10/- P2246 Of- U01191 8/6 3D6 .. 4/- 6960 .. DI- gon .. i4/- 910 .. 2/- n 31e1s. Transmits oer v a dtaisuce of at least 2 miles. 9,4 , • • 6,6 'we] .. 51_ 26 ,.., . • 12 ,,_ 957 .. 5/- 110(388.. 10/- ICY 91 .. 71- PEN 2208 7/- 885147 Iw, - Itequires external batten. of 130% at 12t. In perfect PEN348 I2/- 1301081 3Q3CIT 6/6 4911 . - 13/- 205.4 „ 14f- 958 .. 4/- 20780.. 7/6 11981 .. 8/- 7/- condition, but not tested, 12,8 each plus 3/. p.p. or CI 1983 _ gfe p m:4530D 384 .. 31- 0713 .. 616 2073 .. 12f- 939.1 .. 81- BCF82 _ 7/8 UCL12.. 8/- per pair plus 7/6 p.p. Alto available. 12V Power Supply 10/6 3V4 .. 316 8917 .. OF 26R ge .. 51 _ 2080 .. 13/6 ItC780.. I0/- ILY86 .. 6/6 1/01.83.. 1,0/,-. Units for these seta which abr. contain A.7. Amplifiers for 41)1 .. 41- or23 .• 910 951.60T 8,-_ 3681 • • 8,- FIC871 1n9/- 15 ,...,840 • • Of,: .785,,, n6 • • 1.21,- ..717n 4n1 • • •••7 use ell Intercom system. Set. of transmitter•receiver with 4TBÁ • • 10/- on4 .• 111- 25z40 .. 71.. 5696 - - 6/- 88847 '1- l '''" " 5'• `•"''' • • '""- " " ' • ."- AmplitlerIP.S.U. complete with aerial, aerial base. box of 111402 91- O M . 10/- 26 . 7/6 6763 .. 10i- ECH81 61- 112.81 .. 4/6 PI.81 .. 71- 1/780 .. 610 spore odior . and draw , dina ,.... , 2 • 04.. p . p . 1 0 . , . . 5T4 .. 8/- 011807. 81- 222 ,0 i 8,6 6069 .. e/- E(.1183 716 0E32 .. 10/- 91-82 .. Of- CP U • • 71- gogo _ 25/- St140111 0/6 01.60.4.. 716 ...., „ ECL80., 616 0204 .. I0/- 71.83 .. 6/6 1/786 .. 10f- ZENNER DIODES 5v4e . . 8/- 6118 .. 11/- 4.''''' - • 791- 6146 - 37/6 11C1.112.. 7/6 111133DD let- 71.14 • • 016 U789 . • OF 0AE200 Irv- 0A,2208. • 6/- 7842,5 ... 01 8723 _ 12/- 30016 - • 1 - EC US.. 91- 7/6 71.000.. 13/- 1/1.45 - 5930T 6/- 0/ AC/IILTED 8/- ICT41 .. OF 0A2201 0,6 °A MID.. 61- VE476 .. ei 5 .. 1- 6Q7OT tit- 70 CI 7 • • 17 1- AC112111 10/- 80186.. 816 111'44 .. 6/- PI24 .. 10f- 131.84 .. 6/6 cu mel 6,_ oÁz 9 ii ... 5/6 v8275 _ G., 0/3012- 10/- eti4OT 1016 mole •• WA CL311 .. 13/- lt736 .. 416 8763 .. 11/- PY31 .. 71- 13214 • • 10/- 0REgog v_ ORBoi2 _ 7,0 vB3 B .• 6/ 8.43 • • 8/- 6U8 .. 7(8 3093 . • 9/- CY31 .. 8/6 2937.8 111/- ET66 .. 16/- P1733 .. 9/- 1/1660 .. 7/- BRg2og co BAR213. • 6)0 vR9B . •. 01 1*8 .. eon .. 9/.. 30711 .. Ili- ra ni 4/6 11739 .. 61- ICT88 .. 901- 7781 .. 6/ UY174 .. 10/ 0.9z90 6 6/.. 88448 • • 94_ TR I0A _ 8• 5A 84 _ gm , 8 4 _ 4/... 301.16 .. 12 -• 0,8792 6/- E740 .. 91- LP2 .. 716 PY82 - 6/ • • OAZ21.1u 8(- 7.8.2 .. 616 VEI I A .. 8, 6.174 . • 11/- 6XISOT 6/8 30117 • • 17 /- DA11116 6/- 8941 .. 7/0 N78 .. 19/- PY&I . • 61 Ultel .. 6/- 0,eawn-; lo t_ 68437 .. 6/- 6960 . - 6/- _3_071'21 • • 101 .- , .. - 11942 .. Of- 21188 .. 12/0 PY88 .. 81 U1783 .. 13/6 5.A85 .. 6/0 7D3 • • 11/- 475, • - 14 /-1.1789e • • 703 8 514 • • 6/- 00771 • • -4,- PY 800 - • 8/6 X66 - • 5/0 PLEASE 871•11) 61. STAIR» FOR NEW CATA.. 6•4116 .. 4/- 7D6 .. 8/- 30711 • • 111. DI.90 .. OM EF80 .. 5/- ORP13 12I- QQ ,702.13 43/- 866 /.011UR OF VALVES, TUB28 AND SE/d.I. 60B8 _ 10/- oBtvg _ 7/- 3071.13 *1/-03070 .. IV- 2783 .. 10/- 08760 10/- QQV034 0 35 /. X70 • • 70 ' CONDUCTORS. 6.4Q3 .. 6/- 10C1 .. 10/- 3686 .. 11/- D1010 .. 71- 711,89 .. 61- PC86 .. 121- TBel .. 101-12739 ,. 22/ -

Return to: — Return to: — IF UNDELIVERED RSG B N E W R US KIN H O USE, IF UNDELIVERED RSG B N E W R US KIN H O USE, LITTLE R USSELL STREET, W.C.I LITTLE R USSELL STREE T, W. C.I