Journal of the Radio Society of Great Britain 4111F CATRO NICS FOR NO» 'T RI O GET READY FOR THE NEW BANDS WITH A TRIO TRANS MITTER L_ t e S 30S R2400 WITH NEW BANDS WITH NEW BANDS 2M SYNTHESIZED PORTABLE TR2400 Brief Specification TS130S Brief Specification Frequency Range: 144-148MHz TS830S Brief Specification Frequency Range: 8 bands, 80m-10m Mode: FM Frequency Range: 9 bands. 160m 10m Modes: CW, USB, LSB RF Output Power: 1.5 watts min. Modes: CW, USB, LSB Final Power Input: ...203 watts PEP ISSF. Sensitivity: 1.0e for 30dB SIN Final Power Input: 220 watts PEP (SSA , ..,150 watts DC ICW Display: LCD 180 watts DC ICW) RX Sensitivity: 0'25V at 10dB S/N Memories: 10 built in RX Sensitivity: 0/25uV at 10dB S/61 Commies' Price. £491 Scanning: Auto in 5kHz steps Catronics Price: £639 25W PEP version also available TS130V at £401 Catronics' Price: £198 TS778 WELCO ME TO ViDe000 ALL MODE 2M +70C M 2M COMPACT ALL MODE - • " rAtrnmes ii TS770 Brief Specification Frequency Range: 144 146MHz TR9000 Brief Specification 144 I48MHz 430-440MHz Frequency Range: Modes: USB, LSB. FM. CW Mode: SS8 (USB, LSE!). CW, FM 10 watts RF Output Power: 10 watts. Only for FM: RF Output Power: Sensitivity: SSEUC W 0.25/4V for 10dB S/N 10W (Hi)/Approx. 1W ILOWI FM 0.250V for 12dB SINAD Sensitivity SSB/C W 0-5uV for 10dB Digital, phase locked VCO Ni/N Frequency Control: 5 built in FM 1/4V for 30dB + NI ife Memories: CATRONICS Auto-- 25/ 12.5kHz1100Hz 20dB quieting 1FM) Less than 0-4uV Scanning: Catronics' Price: £345 CatiOrliCS . Price. E730 L_ H7800 to.Lïki 840 G MOCDO 2M FM SYNTHESISED 70cm FM SYNTHESISED MOBILE COM MUN -CATI • NS RECEIVER TR7800 Brief Specification R1000 Brief Specification Frequency Range: 144-145/995MHz TR8400 Brief Specification Frequency Range: 200kHz 30MHz RF Output power: HI 25W, LO 5W (adjustable) Frequency Rango: 430-439/975MHz Modes: AM. USB, 1.56, CW RX sensitivity: 0.20V for 12dB SINAI) Channel Spacing: 25kHz Sensitivity <2MHz: 5/4V Autoscan: 5kHz or 25kHz RF Output Power: 10W 1H11 or 1W ILOI >2MHz: 0-50/ Memories: 15 inc Ix priority RX Sensitivity: 0/4r1V for 12dB SINAI) for tfide S r N/N on SSB Repeater shift: • I - 600kHz Et Reverse Memories: 5 (scanningl Digital Readout: to IkHz Frequency display: 4 digit LED & Mom. No. Repeater shift: t.1.6kHz Clock: Quartz controlled Catrontes Price: £2613 Catronics' Price: f279 Catronics' Price C2B5 We always have a good selection of used equipment in stock—ask for current list. We ale 300 yards from Wallington Railway Station i London Bridge or Victoria! Frequent buses !morn Croydon and Sutton Three large APPROVED .% car parks within 100 yards Hire purchase facilities available on all equipment. Credit cards accepted. Mail orders normally dealt with on day of receipt Securicor delivery arranged All pr.cos Include VA -I- it I,C) CATRONICS LTD, DEPT 106, COM MUNICATIONS HOUSE 20 WALLINGTON SQUARE, WALLINGTON, SURREY SM6 8RG. Tel: 01-669 6700. Shop showroom open Monday Friday: 9.00 5.30, closed for lunch: 12.45 1.45. Saturdays: 9.00 1.00. EXPORT SALES WELCO ME—PAY BY CREDIT CARD OR BANKERS CHEQUE JUNE 1981 VOLUME 57 No 6 CO W u ication EDITOR CONTENTS A. W. Hutchinson 517 Peter Balestrini, G3BPT—ohituary QTC Editorial assistant Election of regional and area representatives Miss S. M. Walker 518 The RX80 (Part 5)—A. L. Bailey, G3VVP 0 521 New products — Thandar SC110 oscilloscope. Thandar TG 100. Thandar TF040 bench Draughtsman frequency meter D. E. Cole 522 Equipment review—Drake TR7 hf transceiver—P. A. Barron, BSc, G3WTM, and P. I. Hart, BSc. G3SIX Editorial secretary 525 New products— Thandar PKW -5000 eprom programmer. Thandar TM354 led. Mrs J. D. Brown hand -held multimeter 526 A vlf up-converter for shortwave receivers—R. Lapthorn, BEng, G3XBM Contributions lincluding Me mbers ads) and all correspondence concerning the content of Radio 527 A simple add-on unit for counting audio frequencies—). Braithwaite. G4COL Communication should be addressed to: 528 The ten-turn "chopstick" helical: a high gain antenna for satellite work—Colin The Editor, RSGB, Richards, 9M2CR 88 Broomfield Road, Chelmsford, 530 Technical topics — Pat Hawker, G3VA Essex CM1 1SS 536 Microwaves—Charles Suckling, G3WDG Tel 0245 84938 538 4-2-70— lohn Morris, G4ANB Office hours: 0900 to 1700 541 SWL news—Bob Treacher, BRS32525 ADVERTISING 542 The month on the air—John Allaway, C3FK M Advertising, other than Me mbers' ads, should be sent to: 545 Propagation predictions FIF propagation study Mr C. C. Lindsay, 2 Leyburn Gardens, 546 Raynet—G. Cluer, G4AVV Croydon, Surrey CRO 5NL 547 Your opinion Tel 01-686 5839 (Not RSGB) 548 Contest news Hours: 0915 to 1715 551 Contests calendar Mobile rallies calendar EDITORIAL PANEL Special event station Looking ahead J. P. Hawker, G3VA R. F. Stevens, G2BVN 552 Club news 554 Obituaries 555 Members' ads Correspondence concerning the distribution of the journal and all other Society matters should be Technical articles on subjects of amateur interest are always welcome and should be sent to: The addressed to: Editor, Radio Communication, 88 Broomfield Road, Chelmsford, Essex CM1 1SS. RSGB Headquarters, All articles received are reviewed for technical merit by the RSGB Technical Et Publications 35 Doughty St, Committee, or an acknowledged expert on the subject, before acceptance. Payment will be made London WC1N 2AE for all articles published. The editor will be pleased to send intending authors a manuscript preparation guide and to give Tel 01-837 8688 any other advice and assistance requested. Office hours: 0915 to 1715 Radio Communication is published by The Radio Society of Great Britain as its official journal on the first Friday of each month and is sent free and post paid to all members of the Society 26,007 copies per Closing date for contributions ABC issue average unless otherwise notified: RADIO SOCIETY OF circulation in 1980 five weeks before publication date GREAT BRITAIN 1981 •:› \ RIo pacesetter in amateur radio TS - 8 3 0 S V.B.T., notch, IF shift, wide dynamic range The TS-830S has every • Wide receiver dynamic range. • 61469 final with RF negative with 20Hz steps, five conceivable operating feature Junction FETs in the balanced feedback. Runs 220W PEP memories, digital display. built-in for 160-10 metres mixer, MOSFET RF amplifier (SSB)/180W dc (CW) input • AT-230 antenna tuner/SWR (including the three new bands). at low level, and dual on all bands. and power meter/antenna It combines a high dynamic range resonator for each band. • Built-in RF speech processor. switch; 160-10 metres, with variable bandwidth tuning • Variable bandwidth tuning • Narrow/wide filter selection including three new bands. (VBT). IF shift, and an IF notch (VTB). Varies IF filter pass- on CW. • YG-455C (500Hz) and filter, as well as very sharp filters band width. • SSB monitor circuit to check YG-455CN (2WHz) CW filters in the 455kHz second IF. Its • Notch filter (high-O active transmitted audio quality. for 455kHz IF. optional VFO-230 remote digital circuit in 445kHz second IF. • RIT Ireceiver incremental • YK-88C (500Hz) and YK-88CN VFO provides five memories. • IF shift (passband tuning). tuning) and XIT !transmitter (270Hz) CW filters for • Built-in digital display (six incremental tuning). 8.83MHz IF. TS-830S FEATURES: digits, fluorescent tubes), (VFOs for TS-830S, TS-130 • ft_SB, USB and CW on 160-10 analog subdial, and display OPTIONAL ACCESSORIES: Series, and TS-120S are metres, including the new 10, hold )DH) switch. • SP-230 external speaker with compatible with all three 18, and 24MHz bands. • Noise-blanker threshold level selectable audio filters. series of transceivers.) Receives WVVV. control. • VFO-230 external digital VFO TS-830S £39.51 inc VAT. Carriage £4.50. TS - 1 3 0 S / V processor, N/W switch, IF shift, DEC option The compact, all solid-state 10 metres TS-130V runs 25W • Built-in RF attenuator • MB-103 mobile mounting HF SSB/CW mobile or fixed slam)! PEP/20W dc input on all bands. • IF shift (passband tuning) bracket. TS-130 Series transceiver covers • Built-in speech processsor. • Effective noise blanker • PS-20 base-station power supp) 3.5 to 30MHz, including the three • Narrow/wide filter selection on for TS-130V new bands both CW (5C0Hz or 270Hz) and OPTIONAL ACCESSORIES: SSB 11.8kHz) with optional • PS-30 base-station power Optional DFC-230 Digital TS-130 SERIES FEATURES: filters. supply. Frequency Controller • 80-10 metres, including the new • Automatic selection of side- • YK-88C (530Hz) and Frequency control in 20Hz steps 10, 18. and 24MHz bands band mode (LSB on 40 metres YK-88CN 1270Hz) CW filters. with UP/DOWN microphone Receives WVVV. and below, and USB on 30 • YK-88SN (1-8kHz) narrow SSB supplied with DFC-230) Four • TS-130S runs 2cmv PEP/160W metres and above). SSB filter. memories and digital display. (Also dc input on 113-15 metres and REVERSE switch provided • AT-130 compact antenna tuner operates with TS-120 and 160W PEP/140W dc on 12 and • Built-in digital display (80-10 metres, including three TS-880S.( new bandsl. TS— 130S £491 05 inc VAT • SP-120 external speaker. TS-130S £401.34 inc VAT. • VFO-120 remote VFO. Carriage £4.50. PS-30 SP-120 TS-130S VFO-120 L O W E ELE C T R O NIC S Ltd CHESTERFIELD ROAD MATLOCK DE4 51E TEL 0629 2430/2817 490 RADIO COMMUNICATION June 1981 PAPPROVEre r i n H I C ) pacesetter in amateur radio -r ni C) TS 530 Sbuilding on success BIRMINGHA M Ward Electronics Soho House, 362 364 Soho Rd.