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Special Offer Wirelessórld SARAMIAT 3 -D graphics Eprom programmer Optical fibres SPECIAL OFFER Real -time clock with 8K by 8 bit non -volatile memory www.americanradiohistory.com THERE'S A PHILIPS INSTRUMENT / THAT'S JUST RIGHT FOR YOU / AT ELECTRONIC BROKERS / OSCILLOSCOPES / 11 PM3256 FULLY RUGGEDIZED PM3219 STORAGE AND PM3206 COMPACT LOW COST PORTABLE 75MHZ REAL -TIME 50MHZ PORTABLE 15MHZ Designed for harsh field environments Dual Analogue storage with variable persistence Automatic triggering for stable trace Easily timebase with independent triggering Alternate Auto erase and auto store facilities High portable and lightweight TV triggering on line display of main and delayed timebase Trigger 2mV sensitivity across full bandwidth Alternate and frame Dual trace with 5mV sensitivity view as third channel display Multi sourced display of main and delayed timebases Easy Versatile X -Y measurement facility External triggering and trigger filters Tough compact unit auto mode triggering with level control Z modulation. with shoulder facilities combined £295.°° strap. £1, 55000 with easy operation. £2,99500 PULSE GENERATOR / FREQUENCY COUNTERS/ DIGITAL MULTIMETERS 111111111111. 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Tel: 01 -267 7070 Telex 298694 Fax No: 01 -267 7363 For further information contact our Sales Office. All prices exclusive of carriage and VAT Prices correct at time of going to press. A copy of our trading conditions is available on request. CIRCLEwww.americanradiohistory.com I FOR FURTHER DETAILS. Editor ELECTRONICS & PHILIP DARRINGTON Deputy Editor GEOFFREY SHORTER, B.Sc. 01 -661 8639 Technical Editor MARTIN ECCLES ire esswor 01 -661 8638 Projects Editor over 70 years in independent electronics publishing RICHARD LAMBLEY 01 -661 3039 or 8637 (lab.) May 1986 News Editor Volume 92 DAVID SCOBIE 01 -661 8632 Number 1603 KURIU Drawing Office Manager ROGER GOODMAN 01 -661 8690 FEATURES BETTY PALMER Advertisement Manager Fibre Optics '86 New directions for marine dlf Q 43 ASHLEY WALLIS 1 8 If you think fibre optics is not for 01 -661 3130 by J.D. Last you, this event might surprise you. MICHAEL DOWNING Despite the growth of modern 01 -661 8640 navaids, radio direction finding is Sensitivity analysis Northern and Midland Sales still in common use. 46 BASIL McGOWAN by J. Lidgey 021 -356 4838 Generally used for filter analysis, Classified Executive A technique is just as valid in 6800 board-5 SUSAN PLATTS many other branches of electronics. 01 -661 3033 by R.F. 2 Coates Advertising Production To conclude this series, a selection BRIAN BANNISTER of programming examples. Timing by remote control 51 (Make -up and copy) by P. Ferris 01 -661 8648 Self- contained, microprocessor - Electronics & Wireless World controlled timer for up to eight is published monthly programmer for the USPS NO 687- 540 Eprom 28 appliances, with 100 on -off settings. Apple ll Current issue price 95p, back issues (if available) £1.06, at Retail and Trade by P.B. Unstead and A. Counter, Units 1 &2, Bankside Industrial Blunden Measuring tape speed 55 Centre, Hopton Street, London SEl. Expanding the Apple: the second in by M.E. Theaker Tel. 01 -928 3567. a series of lab. interfaces. Available on microfilm; contact editor. A simple and accurate method of By post, current issue £1.30, back issues ensuring the correct speed of (if available) £1.40, order and payments to EEP Sundry Sales Dept. Quadrant cassette tapes. House, The Quadrant, Sutton, Surrey SM2 5AS. Tel. 01 -661 3378. An introduction to 3D graphics 36 Editorial & Advertising offices: 1Obit digital recorder 56 Quadrant House, The Quadrant, Sutton, by H.W. Gleaves by T. Loughlin Surrey SM2 5AS. Using microcomputer Basic to Telephones: Editorial 01 -661 3614. Using modern data -conversion i.cs, Advertising 01 -661 3130 01 -661 8469 produce "three dimensional" signals images in perspective. very low- frequency analogue Telex: 892084 BISPRS G (EEP) can be recorded on tape with high Facsimile: 01- 661 2071 (Groups II & III) accuracy. Beeline: 01 -661 8978 or 01 -661 8986. 300 baud, 7 data bits, even parity, one stop -bit. Type control -Q, then EWW to start; NNNN Special Offer to sign off. Subscription rates: 1 year £18 UK A battery- backed, real -time clock/calendar with a 64Kbit, non -volatile ram at a special and £23 outside UK. price of £35. It will hold data for ten years and keeps track of hundredths of seconds, Student rates: 1 year £11.40 UK and tenths, seconds, minutes, hours, days, date and year in computer or controller £14.10 outside UK. appears on p.27. Distribution: Quadrant House. The applications. A description Quadrant, Sutton, Surrey SM2 5AS. Telephone 01 -661 3248. Subscriptions: Oakfield House, Perrymount Road, Haywards Heath, REGULARS Sussex RH16 3DH. Telephone: 04444 59188. Please notify a change of address. News Communications USA: $49.40 surface mail. $102.60 6 31 wremited airmail. Business Press International Radio data next year commentary (USA). 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