September 1977 radio nication odio S • ot Brit N F D 1977 Results in this issue Thames Valley ARTS operated with all the home comforts of a member's caravan at Kempton Park Racecourse; G3GTX on the key, with G30GP Verulam ARC's HF NFO station was visited by an "official" RSGB inspec- Keenness and determination on the face of tor (G4BOU) complete with standard Tom my Boucher, Inr op of G3OLB. at the Bristol bearer (G3JKB). They carried out a Contest Group's HF NFD station. Photo: G3TKF most thorough inspection of a great many things that did not really con- cern them and made use of an un- believable amount of test gear they brought with them! Needless to say. G4B OU and G3JKB are well-known Dundee Kingsway Technical College RC HF members of the Verulam Com mittee. NFD station being operated by (I to r) GM3VEY, Photo G4EEI GM4BAG and GM4CUZ. Great concentration seems to indicate a difficult contact RADIO COMMUNICATION September 1977 William Munro (lnvergordon) Limited distributors for NEC Amateur Radio Equip ment AL NEC NEC CQ110E Transceiver (Ex Stock) £645 plus VAT £80.63, Total £725.63 (Price includes Securicor Delivery) Frequency Range 10m-15m -20m -40m -80m-160m and 11m and WWV 15MHz on receive only. Mode LSB—USB—C W—AM —FSK—FAX/SSTV Power Requirements 100/110/117/2001220/234 Volts AC or 13.5 Volts DC Input Power 280 watts PEP (240 watts on 28MHz) Digital Readout—Separate Crystal Filters for each of LSB, USB, and CW. AC and DC power units are built in. Switched metering for "S" meter, Relative Output, Plate Current, and ALC for setting MIC Gain. The following accessories are supplied with the Transceiver-Microphone, DC Power Cable, AC Power Cable, 5 RCA Plugs, 2 Spare Fuses, 2 Jack Plugs, 2 Allen Keys and a 60 page instruction book. Built-in speaker with 3 watts output. A hybrid design utilising the best features of valves and semiconductors is used to give a high performance. 7 Valves-49 Transistors-19 FETs-128 Diodes-25 ICs. The use of the RCA low noise beam deflection valve (7360) as receiver mixer gives the CQ110E high sensitivity combined with remarkable crossmodulation characteristics. CQ 301 2KW Linear Amplifier-10 to 160m with built-in power supply and 2 E1MAC 3-500Z Valves Ex-stock. £760 plus VAT £95, Total £855. (Price includes delivery) SECONDHAND EQUIP MENT KW2000B with AC PSU £200 (incl. VAT) TRIO TS-510 with AC PSU £185 (incl. VAT) Please contact us for any specific item of equipment as our stock is continually moving. We also stock Antennas and Accessories—Microwave Modules—Modular Communication Systems—Solid State Modules—Antex Products Components etc. = 100 HIGH STREET, INVERGORDON, ROSS-SHIRE IV18 ODN. BARCLA Telephone 0349 852351 Telex 75265 HIRE PURCHASE INSURANCE ISSN 0033-780 EDITOR A. W. Hutchinson Editorial assistant radio Mrs M. J. Collins communication Draughtsman D. E. Cole September 1977 Volume 53 No9 Secretary Mrs J. D. Brown C O N TEN TS 677 Current comment. QTC Contributions (including Members' Ads) and 680 A channel scanning arrangement for quartz crystals— all correspondence concerning the content of !. J. Dilworth, BSc, G3WRT Radio Communication should be addressed to: 684 Simple circuits for the beginner—R. S. McMillan, GM8JUY The Editor, RSGB, 687 Some experiments with high-frequency ladder crystal filters— 88 Broomfield Road, J. A. Hardcastle, G3JIR Chelmsford, Essex C M1 1SS 688 Calculation of distances from QTH Locator codes or latitude and longitude using scientific calculators—J. H. Bowen, CEng, Tel 0245 84938 MIERE, G8DET; R. C. Harvey, TEng (CEI), MITE, G4BBR; A. J. Harries 690 Technical topics—Pat Hawker, G3VA Correspondence concerning the distribution 695 Microwaves— Dain Evans, G3RPE of the journal and all other Society matters should be addressed to: 696 4-2-70—Graham Knight, GM8FFX RSGB Headquarters, 698 RAE courses 35 Doughty St, London WC1N 2AE 699 A new look for the Radio Amateurs' Examination— R. J. Hughes, G3GVV. Tel 01-837 8888 Oscar news 700 The month on the air—John Allaway, G3FK M ADVERTISING 703 Propagation predictions. HF propagation study Advertising, other than Members' Ads, 704 Nominations for election to the 1978 RSGB Council should be sent to: Obituaries. Your opinion Mr C. C. Lindsay, 705 Special event stations 2 Leyburn Gardens, They met at the palace Croydon, Surrey CRO 5NL 706 National field day 1977 results 709 Contest news Tel 01-688 5839 711 Club news 717 Looking ahead. Contests calendar Mobile rallies calendar EDITORIAL PANEL 718 Members' ads J. P. Hawker, G3VA R. F. Stevens, G2BVN 721 RSGB QSL Bureau sub-managers Radio Communication is published by The Radio Society of Great Britain as its official journal on the first Thursday of each month and is sent free and post paid to all members of the Society ABC 20,432 copies per Closing date for contributions issue average unless otherwise notified: C) RADIO SOCIETY OF 1114.1.ateb circulation in 1976 4th of month preceding month of publication GREAT BRITAIN 1977 A • • _ - — • I South Midlands •-••••• ESTA BLISHED 1958 19 YEARS SMC's TWO YEAR GUARANTEE ON YAESU SECURICOR "24 HOUR" DELIVERY FREE STOCKS —THE LARGEST IN THE U.K. Many may make this claim but we invite you to write for our stocklist and ask us first for your requirements. SERVICE-REPAIRS, MAINTENANCE AND TESTING We have a comprehensively stocked, equipped, and staffed workshop to test all equipment before despatch and handle warranty work. SATISFACTION —YOURS (AND OURS) OUR AIM We consider that both parties should be contented with any transaction. STABLE AND RESPONSIBLE DISTRIBUTION We believe that it is in the best long term interests of our dealers, our customers, and for the hobby, to provide the right equipment and maintain our services at a sensible price. We do, however, in the present difficult circumstances, reserve the right not to be undersold. STUDY OUR LITERATURE STOP HERE FOR A COFFEE SHOP AT YOUR SINGLE-STOP SOURCE—S MC THE FT221R, COMPLETE 2M STATION Ex-Stock The FT22Iii. Tho muitimode USB. L513, A.M., F.M.. CW, (with semi-break•In and side tone). 2m trensceiver •••-•n- offering the choice of Phone locked VFO or 44 crystal channels, simplex or repeater (600Hz up and down shiltO with unique 'double push' auto tone burst, mains or 12V (3A) °Potation, excellent selectivity. SSS 2.4kHz (1.7: S.F.) or FM 12.kliz. Front panel adjustable VOX end mic gain, a calibrator (IMHz 10). lkHz readout and linearity sensitive squelch, clarifier with IRT and IRT with ITT (makes F.S.K. easy), swItchable "S" and centre zero tuning meter, noise blanker, serviceable plug in boards all contained in lle(14") e 5' il 11r, 2215, rigid package. 600j,Ht : ond 1.6MHz shifts over IMHz. Now the YC221 digital readout unit for about £75 111011111•1111111m m mu m m FT221 R - • THE FRG7, general coverage receiver Ex-Stock UNPARALLELED IN ITS CLASS AND ONLY £145 (VAT 121 %) Tho FRG7 loo general coverage solid stale receive, with specifications unparalleled in its price range- It uses a Barlow Wadley Triple-mix, drift cancelling loop for continuous, spin•tuned Inclusive coverage of 0.5 to 30MHz with calibration accuracy better than 5kHz. Frequency selection is accomplished by setting the RF (pre-selector and range switch), dialling up the required number of megahertz, then tuning the VFO knob as normal. The receiver Is sensitive (0.5g11 for 10dB. S ,.. NIN (SSB)) and stable (within 500Hz for ano 30 mloutell otter warm up) with A.M., SSS and CW modes catered for. A 3 position audio filter, RF attenuate', dial lamp conservation switch, recorder and phone sockets are fitted, It Is mains powered, but should tr the supply fail, or portable operation be required, 8 dry cells are automatically switched in. The FT101E complete HF station—ex stock. The FT101E. A complete mains or 12e. OC station contained in a compact 301b. package, 260W, PIP of SSS (with in-built RF speech processor) 180W, CW and 80W or AM 10 10 160m (inc. 10 MHz RS). Tho sensitive and selechve (permeability tuned RF stages and 8 pole crystal filter) receiver afters: threshold adjustable noise blanker. switch- able 25 and 100 kHz calibrator, tt 5k clarifier (with separate on/off switch), etc., etc. The VFO is stable and linear (readout to 1 kHz). external VFO or crystal control can be selected. with LEO Indi- cators Illuminated accordingly. Carrie' level is adlustabto for: tune up. AM and for CW Operation, whose perfor- mance with the semi break-in keying, with side tone, and the optional filter installed le of a high order. Linear and transverter provisions are made with sockets for: re/ay contacts, ALC output, all internal HT supplies, low level RF heater links nod switches, etc., etc. New service manual for the FT101 series in stock £12.04). FT10IE SEND A LARGE (10 x 12) SAE or 15p STAMPS FOR YAESU CATALOGUE- STOCK PRICE- S'H LISTS, ETC. SOUTH MIDLANDS COMMUNICATIONS LTD. EVENINGS —AGENTS —ALL QTHR OS B O R N E R O A D, T O T T O N Herd Office, S..2orirooms G3ZUL Stourbridge (03343) 5917 Brian Kennedy SO U T H A M P T O N, S O 4 4 D N ) Cables:Aerial Southampton GM8DOX B. el Allan (078683) 3223 Ian McKechnle Telex :477351 SNICO M M G G W3TMP Pontybodkln (035287) 816 Howartn Jones Hours of business: 9-5.30; 9-12.30 Saturday Tel :Totten (04216)7333 (31ines) GI3W WY Tandragee (0763) 710656 Mervyn Anderson 658 RADIO COMMUNICATION September 1977 Communications Ltd \e/ OF PR OFESSIO N AL EXPERIE N CE TELOM AST WITH TA33 HA MTO W ER with TH3 Jnr.