32bit Convert It c9.69.01 serial key or number

Share

Transcript

1 Australia AS Canada $ Denmark Kr. Germany Dm. Greece Dr. Holland Dfl. Italy L. Norway Kr. Singapore MS Spain Ptas. U S.A. $ JdirgiUl,a/ 19 50p Community broadcasting Multi- section equalizer Off- resonance metal detector Analogue comp., manicapital.com

2 Wireless W Almost everyone agrees that digital multimeters more accurately meet the market's needs. And, we're proud to say that Gould have more to offerthan most, all with LCDs. Take the Alpha IV, with its 25 measurement ranges; and the Gamma with true R.M.S. Shown is the Beta, with its 31/2 digit display, plus the DMM12 offering 10jV resolution,41/2 digit display and true R.M.S. If your readings are still giving you the needle, ask for our com- prehensive data. Or, if yo'J're already a committed digital man, ask Gould to demon- strate the way in which we've stretched MOS technology to bring you a finer product at a practical price. Model Display DC Res. DC Accy. Alpha IV jV % Beta V % Gamma pV % DMM12 10jV % Gould Instruments Division, Roebuck Road, Hainault, Essex 1G6 3UE. Telex: DMM12 True RMS Multimeter 11, Tel: ( hrservice). DISTRIBUTORS: Scotland Fenwick Electronics Ltd Tel. N. Ireland IMEX Instruments Ltd Tel Lisburn Eire IMEX Instruments Ltd Tel Dundalk 20Mn V ma kn Ronge } )t0 "9` Multimeter j;.iTit%#"r"4IPNr J

3 Remote control is seeing red. Infra red with - - nti BPW RELATI 73QC) (nm) BPW41 isthe new infra directional response, low cordless telephones, TV red detection response junction capacitance for channel selectors, toys, photodiode, from Ferranti. fast response, voltage remote keyboards for The important news is that variable response times, a VDU's, security or alarm we've built in a narrow band mm2active area for - systems BPW 41 could infra red transmissive filter increased sensitivity and solve a lot of your problems. thateliminatesthe need for virtual immunity to Pick up the phone separate filters and gives a extraneous visible (cordless or not) and ring very selective spectral radiation. or write to response. Take a look at the With the kind of Opto-electronic Marketing, curve, you'll see it peaking improved performance Ferranti Electronics at nm. BPW 41 gives you, you Limited, Fields New Road, BPW41 offersa narrow could do more with your Chadderton, spectral band width remote control system. Oldham OL9 8NP combined with broad Whatever you're into - FERRANTI WW - FOR FURTHER DETAILS Semiconductors manicapital.com

4 2 WIRELESS WORLD. JUNE IrP vri,, 11%, The world over - For high quality electronic valves, semiconductors and integrated - circuits and the speediest service - You get the specify Haltron. Its the first choice of Governments and many other users throughout the world. Haltron product best service quality and reliability are clearly confirmed. The product range is very, very wide. And Haltron export from Haltron expertise will surely meet your requirements. Wherever you are, get the best service. From Haltron. Hall Electric Limited, Electron House, Haltron Cray Avenue, St. Mary Cray, Orpington, Kent BR5 3QJ. Telephone: Orpington Telex: WW - FOR FURTHER DETAILS manicapital.com

5 WIRELESS WORLD, JUNE 3 DON'T GAMBLE WITH PERFORMANCE BUY LEVELL TESTERS Tests bipolar transistors, diodes and zener diodes. Measures A logarithmic scale covering 6 decades is used to display leakage down to nA at 2V to V. Current gains are either insulation resistance or leakage current at a fixed checked from 1 pA to mA. Breakdown voltages up to stabilised test voltage. The current available is limited to a V are measured at 10A, A and 1 mA. Collector to maximum value of 3mA for safety and capacitors are emitter saturation voltage is measured at 1 mA, 10mA, 30mA automatically discharged when the instrument is switched and mA for IC /IB ratios of 10, 20, The instrument is off or to the CAL condition. The instrument operates from a powered by a 9V battery. 9V internal battery. TRANSISTOR RANGES (PNP OR NPN) RESISTANCE RANGES Er 10nA, nA, iA,10A and A f.s.d. 1 10M S2 to 10T 0 ( 0) at V, V, V and 1kV. C B O E B O I acc. 2 %f.s.d. 1% at voltages of 2V, 5V, 1M to 1T 0 at 25V, 50V and V. S2 10V, 20V, 30V, 40V, 50V, 60V, 80V, V, k 0 to G O at V, 5V and 10V. V, and V acc. 3 %mV up to 10A with fall at A < 5 % +mV. 10k0to10GOat1V. Accuracy 15% + 0 on 6 decade logarithmic scale. BVCBO 10V or V f.s.d. acc 2 %f.s.d. 1% at currents of 10A, A and 1 mA 20 %. Accuracy of test voltages 3% 50mV at scale centre. Fall of test voltages < 2% at 10A and < 20% at A. IB: 10nA, nA, 1 A mA f.s.d. acc. 2% f.s.d. 1% at fixed E of 1 A, 10A, A, I Short circuit current between A and 3mA. 1 mA, 10mA, 30mA, and mA acc. 1%. CURRENT RANGE of to , to 30 and 3 inverse scales pA to A on 6 decade logarithmic scale. hFE to 10 convert B into h F E readings. I Accuracy of current measurement 15% of indicated value. VBE: 1V f.s.d. acc. 20mV measured at conditions Input voltage drop is approximately 20mV at pA, mV on hFE test. at nA and mV at A. 20mV at collector currents of 1V f.s.d. acc. Maximum safe continuous overload is 50mA. VCE(sat) 1 mA,10mA, 30mA and mA with C/I B I MEASUREMENT TIME selected at 10, 20 or 30 acc. 20%. < 3s for resistance on all ranges relative to CAL position. DIODE Et ZENER DIODE RANGES

6 4 AIREI. [SS WORLD JUNE Fault us on quality and we'l - ant. For twenty years, Erie RFI filters have been collecting qualifications - like being chosen for every major satellite, missile, aircraft and communications pro- gramme in the U.S. and Europe. The wide range includes HF. broad- band and multi- section filters with soldered or bush mountings as well as rectangular and circular filter connectors and filter pins. Erie technical supremacy extends right from the ceramic powder to the MIL -approved test house, but at ITT Mercator we do not accept Erie filters on their reputation and MIL -certificate alone. Each batch is tested in our own laboratory to permit DQAB release. We make doubly sure that you can be sure of the quality of Erie filters. ITT Mercator, South Denes, Great Yarmouth, Norfolk, NR30 3PX. Tel: () Telex: worldwide component sources WW - ITT mercator FOR FURTHER DETAILS manicapital.com

7 WIRELESS WORLD, JUNE 5 PRINTER BREAKTHROUGH! ONLY + &P E5 + VAT P 80 COLUMN HIGH PERFORMANCE IMPACT PRINTER The ideal companion for PET, Apple, Also our micro chips are at micro prices. Dori t be tooled by low prices. We do not of er for TRS80, Exidy, Superboard, Compukit sale. surplus, sub-spec or rebranded devices. All our parts are guaranteed new, first quality. and most Micro's factory prime. full spec devices. It is also our policy to offer you the best of new devices that Rugged metal enclosure makes it ideal for betonte available and these are featured regularly. Prices are exclusive of pip end VAT - home computing, small business systems, data logging please refer to "Ordering Information" before ordering. Official orders from Schools, etc Colleges, Universities and Gov. Authorities accepted. Base 2 Model M ST Compare the features. e 96 character ASC II Standard 99p and Centronics /0 a Auxilliary User Defined Character Set 75p RS, 20mA. IEE 1 PCFIFO KHZ + 16 Baud Rates to a Accepts 81/2" max. paper - pressure feed 9'/: 55p 65p 55p 73p 8p 88p LHPC NS p p NS APC FIFO 1 M HZ p 60 Lines per minute Bidirectional - a 5 print densities 96, or max. paper - tractor feed. PLUS: NS p p 65p 10p NS p Chr /Line a Tractor & Fast Paper Feed /Graphic, 55p 99p PC 64 bit sdt reg- NS p ister p Self Test Switch a 2K Terminal Buffer 55p 56p NS p PC 80 be shdt reg- 55p 9Op 38p 40p 4K CMOS NS p ister p X -RATED CLOCK! ONLY 1 9p Custom high impact moulded 75p 73p EPROMS DIL SWITCHES 4 pole 99p ZULU II CLOCK KIT WI NOXt4m CIRCUITND case with ruby lens E PAP B2p VAT 11p NS p 6 pole p 12p 5V NS p X -TRA VALUE. All the components and high quality plated G PC Boards are provided p 8 pole p open layout 12p 32K NS p X -TRA CARE IN DESIGN. No wires between readout board and clock board. Large 13p p p VOLTAGE X- CELLENCE IN IDEAS. 5 years of designed products for the amateur radio market 17p U ARTS REGULATORS X- CELLENCE IN INSTRUCTIONS. Clear srep- bstep instructions with quality illustrations The 18p p assembly manual is not a read- between -the -lines afterthought, p 18p 18p 56p AYA AYD p p / 55p 65p X -TRA FEATURES. There has never been a clock kit with so many features - at any price, p IM p 78HC p Unit operates on either 12 VAC or 12 VDC. 28p 19p 16p 78HGKC p On board QUARTZ XTAL TIMEBASE. 19p 18p Automatic BATTERY BACKUP'. Never worry about power failures againi 25p 28p 25p Reads true 24 HOUR TIME and 31 DAY CALENDAR. 16p 25p RO UC p Unique NOXtm CIRCUIT activates readouts with a handclap or they can be turned on constantly B5p 25p When used mobile readouts blank igrmtion is off 75p 20p KEYBOARD ENCODER Kit Special NOISE SUPPRESSION and battery reversal circuits. 32p 32p 40p 40p 88p 23p 29p AY p The SE contains all is a complete kit that Bright 'h" LED s Show hours minute and seconds Just clap your hands and the time appears for 5 seconds followed by the date for 4 seconds A low 35p 23p FLOPPY DISK the parts to cost 9V transistor battery provides stand by power in the event of power failures up to 4 hours. With 25p CONTROLLERS the addition of a low cost 2V MA transformer, the unit will work on AC 50p 86p build a pro- 91i ,q.r.,. Or 1 50p 68p FD B Single den- grammable." 45p 13op soy IBM Compatible sound effects , -- 35p 45p 90p 68p p I9M Compatible B p Dual density op .ggenerator Designed around the 1 Og:" ULTRASONIC invisible SENDER RECEIVER KIT ultrasonic (23KHZ) Sound beam works like a 99p new Texas TOTAL SECURITY! Completely 55p 45p p Instruments photoelectric beam but is unaffected by light. heat or noise. Separate Transmitter and Receiver tlOp SN can be used from 6 inches to feet! A solid object breaking the beam causes an output to go SOp p p p 25p p Sound Chip, low that will sink up to MA to Drive a Relay, TRIAC. etc. Complete electronics are p p E p the board provided. Works on 12VDC (unregulated) and draws less than MA. Use it for burglar p 68p p p ro o ides alarms, object counters, automatic door openers, automatic door bells, electronic rat p 52p p banks of 90p MINI DIP trap(?) and more. ONLY E P &P 67p + VAT p p 90p 7p A p switches and 74LS p p pots to pro- OW. Ar Qa79 gram the O1NPRBLE ALARM KiT Cf , 75p A p 18p p Z p various com- 74L 12p p p binations of A fun EASY kit to assemble that emits an ear piercing 10 15p p WDB p the SLF watt dual tone scream. Resembles European siren 74L 20p 99p Oscillator, sound. Great for alarms or toys. Operates from 5 -1 2VDC 1Weet 19p VCO, Noise, 99p at up to amp (using 2VDC 8 ohm speaker). Over 74LS11 30p g One Shot. 1 1 r p five thousand have been sold All parts including PC AY PROGRAMMABLE 30p p p and Envelope Controls A Quad Op Amp SOUND GENERATOR 60p p p IC is used to implement an Adjustable board, less speaker. ONLY E P &P 67p + VAT The AY 3' is a 40 pin LSI chip wrih three S15 38p 99p Pulse Generator, Level Comparator and 19p p p p Multiplex Oscillator for even more Ver- t LM RC ENCODER /TRANSMITTER oscillators. three amplitude controls, pro- grammable noise generator three mixers, an 19p 25p 26p p p p p satility. The 3'/ " x 3" PC Board features a prototype area to allow for user added \)) LM RC RECEIVER /DECODER envelope generator and three D/A con- . verters that are controlled by 8 BIT WORDS p p New from National The LM is a complete six- channel drgrlal No external pots or caps required This chip 56p p p circuitry Easily programmed to duplicate proportional encoder and RF transmitter intended for use as a low hooked to an 8 bit microprocessor chip or S47 78p 70p 3BSp Explosion, Phaser Guns, Steam Trains, power non -voice unlicensed communication device at carrier Buss ( Z etc can be soft - I 85p 22Sp 74LS49 99p p p or almost an infinite number of other frequencies of 17 MHz or 49 MI with a field strength of 10, controlled to produce almost any p uV meter at 3 meters In addnron :o radio controlled hobby toy and und re it will play three note chords, make 30p 46p sounds. The unit has a multiple of appli- bangs whistles s gunshots espio. p industrial applications. the encoder section can provide a serial s 30p 79p p cations The low price includes all parts, input of six words for hard wired, infra -red or fibre optic s bleets whines. or grunts In addition. 39p p p assembly manual, programming charts, communication links Channel add logic is provided to control the 4 has provisions to control its own memory 39p and detailed chip specifications. It 40p 40p 74C 74C20 30p p p p runs on a 9V battery (not included)- On umber of encoded channels from three to siy allowing increased design flexibility When used with the LM RC receiver / decoder a low cost RF linked encoder and decoder system provides chips with two ICI ports The chip requires o 5V @ 75ma and a standard TTL clock oscrIlator A truly incredible circuit Only 69p board MW amp will drive a small 74C76 60p p two analog and two ON /OFF decoded channels Super versatile E 50p p MCVL p speaker directly, or the unit can be con- chip Just out Just look at the features - low current 9V battery 60 page manual with inters ace 79p 74C97 p Z8O PIO 59Sp nected to your stereo with incredible operation - on -chip RF oscillator /transmitter one timing - nstructrons and several programming 74L 69p - - , 74C98 p CiC p results! (Speaker not included capacitor for six proportional channels programmable number of examples E estra (NO VAT) - ) 75p 10op Z Pio p external modulator channels regulated RF output power 75p 65p 74C 74C p p ?BOA CTC DMA p p COMPLETE KIT ONLY E P &P 67p + VAT bandwidth control - on -chip 4 6V regulator up to 80 MHz- 78p ZOO carrier frequency operatron 74C p ZBUA DMA p LM E5,50 LM E Pair 90p 74C p 0 p UNIVERSAL SCR 90p Date sheets 25p each. p 74C p Z SIO - 0 p 30p PROGRAMMABLE DUAL OP p SIO p C D V/ 5A Sale Digit - 10 MegeHerta 99p 99p 74C 74C p SIO 1 1 p Intersil 8 Univanal Countat Nt TRANSCONDUCTANCE 74C p SIO 2 p Kit Includes. Resistors AMPLIFIER 87p 45p Z 7 p JOYSTICK ICMAIDC IC Capacitors p 10 MHz Quartz Crystal Diode. New Irom National Semiconductor, the p t M rs a programmable dual operation p LINEAR IC's INLINEARE Segment ,3r' LED Displays f8) PC Board 7 Switches IC Socket transconductance ampldier designed to be p used as a lundamental building block in p AY p DM p Order Pert Number ICMAEV /Kit Only current controlled amplifiers filters and 95p AY .3 p p oscillators It can also be used ,n multi- 74L p 30p / p THE ULTIMATE RECEIVER ample and hold 57p 41 33p 18p p p Muhiband Dynamic Sound Portable Radio It s a monitor too - ptexers rimers and a circuits It ,s well sudedfor d use in electronic p aionnors all 40CBchannels TV (VHF). PB. and WB organs and music synthesizers. because rt p CL p ;4 p MODEL C. ONLY E p.p. E can modulate waveshages wrlh ease The 16 p 07 p p 8 Band Receiver Frost dew Wide rear dew pin LM rs programmable over p CL _95p p CBI CB2 TV1 p STAR FEATURES AM - decades. allowing it to funcnon as abasic p CMA p Ideal for all video games or remote control FM PB WB TVs Swivel Telescopic building block in a broad range of electroni- / - p CM p 50p protects Antenna Tuning & Battery Indicator AC / DC cally programmable resistors and filters A p CM 7h55 80p / 75p Small c se sae 11/2"H 2hr "W x Switch Control DC 6V UM -1 15ize D) 4 truly remarkable cpcurt ONLY E1 + 30p p 16Lse NILMI 19p MAN M M 50p 75p (4T95 p p 4 each -5 miniature potentiometers - OHM AC V AFC Switch Control Tone Con- tint Nylon Shoulder Strap or Plastic Handle mimmomer 4" PM Dynamic Speaker Dimensions W From T VAT Data 25p TL BAR /DOT DRIVER IC. p 1 M 45p SPST push button gontrol x H 22 x D 90mm 19p 75p M M 45p LED. 5wire connection cable - 5 fleet long NEW Drives 10 LEDs with adjustable analog steps Units are cascadable up to 10 steps) 65p 9p Rugged plastic case Drives LEDs directly Great for voltage, 19p M 65p 13p E each 80p JVC TUNES SYNTHESIZER JAPANESE TRANSISTOR current or audio display.. Similar ,n M p 15p The A it a MOS microcomputer features to LM wan spar L 35p M p SUBSTITUTION MANUAL - T 12p synthetlzer al preprogrammed loner for An invaluable Japanese to 45p M 50p 15p LED BAR GRAPH AND applications in toys. bates old notes Japanese substitution 24p 38p M M M p p p T DISPLAYS 18p BOp ANALOG METER DRIVER New horn National I M Dives 10 LED door chimes. Eke standard devise has a sit of 25 different popular and clinical tunes. In addition there are 3 chimes guide for epproimately 3, transistors. Covers ihr- 25A 2SC ONLY E -w' 1T ,I lop NE 18p directly for making bar graphs audio power 11 li HEY, 75p FND 80p - making a total of 25 Noes. and 2S0 series 1 11 NE 50p FN p analog eters. LED Oscillators etc FEATURES 35p RC 85p Introduction includes a Matching fed bar display MV E 75p 85p Unit can be stacked lor more LEDs A super Mdmd external compolels. guide to understanding SNN p DL 85p versafile and truly remarkable IC fammal /e switch alt signet al end el Data 25p 4( 76p 'HAPAS 85p MSS Special price Only E Japanese transistors 42p tune for paver nvt.g. In 55p p Ordering information. Unless otherwise 88p p ISOLATORS 2 page data 25p 1 Matching red bar display MV E Envelope tonal la give mono quatty. organ or Only stated for orders under C50 add 50p p &p p g 75p Add 15 x, VAT to total All items are sublect 88p Data 25p Sequential lune mode p ILD14 p to prior sale and therefore sublect to 22p p 4 deer salability whet used as door p clime JAPANESE TRANSISTOR availability Prices are subject to change 50p p MCT6 90p 2Op LOW PROFILE SOCKETS BY TEXAS SALE Operation with tunes in external SPECIFICATION MANUAL without nonce p T i 75p fantastic p i L 1 1 8 pm 7p 18 pin 15p 24 pin 22p PROM it required This new 45p 9p ,l0 pin 18p 25p Salle supply 1+ operation. specification manual 75p 80p INTERSIL CHIPS ARE DOWN rill er 14 pin 16 in 10p 72 pin 20p 28 pin 40 pin 28p Tenet include'. STAR WARS, BEETHOVEN's 91h 5 15h. JINGLE TJ Specs on VCBO. VE80 IC. ICBO HFE and morel (Tlicro 50p p p CL/CPL HIPS p LIQUID CRYSTAL DISPLAY High Contrast Ratio BELLS. YANKEE DOODLE. STAR SPANGLED BANNER. CLEMEN- TINE. GOO SAVE THE QUEEN. 0 Includes mechaii,r,d drawings that illustrate case styles anti sizing of each pa-, circrifs p p SOLE MID. WESTMINSTER 4 Meeting Street, Appledore, Nr. p CLCPI CLCCPD p Wide Viewing Angle (e CRIME and DESCENDING sieor 4( p in. Digit Height OCTAVE CRIME PLUS MANY MORE, Bideford, North Devon EX39 1 RY. 1OSp p CMAIJ1 CM P1 p ULTRA Low Power Consumption only detailed specs Only Tel, Bideford () p CM IPA 80p LCDIO6 E and instruction Telex, WW FOR FURTHER DETAILS

8 6 WIRELESS WORLD, JUNE Carston Electronics test specialists in second user and measuring instruments Prices from f HEW Manual Entry Keyboard Push Button Display for Time or measured Value of Selected Channel P Card (Quantity 10 Channel I as required) Price per 10 Channels 80 FACIT EX STOCK Tape punch IASC CLARY 35// 10 columns, 2,r- wide paper print cycle. Interface for only Distortion Systems RADFORD DELIVERY oscilloscopes DMS2 10 Hz KHz meter LD02 10 Hz KHz Oscillator Function Generators ADVANCE J4. 10 Hz kHz. 10 V r.m.s. output Sine /Square Wave HEWLETT PACKARD NIX TEKTRONIX 12 0 Hz -5 MHz. Multi -Mode. / /50Q sine, square, triangular INTER -STATE Trace 5mV -5V / Div ELECTRONICS MHz Dual D / B XY DC 4M Hz F51A Multi-Mode. and offset: Hz to 10 MHz. 10/15V/ Div Delay 0 F55A Mglb -Mode, )Z5 Hz MHz. 10V. Ext. VGC. Burst A 0, P up to k bursts /sec PHILIPS TEKTRONIX Trace 5mV -5V G PM Hz MHz. Sine/ 1 Square Triangular /Pulse outputs. MHz Dual External sweep facility 3OVp. p max X Dv 3MHz output Div Delayed T / B Logic Analysers O.O s s/ DC - HEWLETT PACKARD L Logic state analyser 12 channel display Modulation Meters AIRMEC GYV0 YTAA rrCC` MHz. AM FM WrrH 1 MHz, AM /FM MARCONI TFA 1 MHz. AM. FM Multimeters- Analogue AVO 8MKIII AC DC V. AC DC Amps OHMS 60 Oscilloscopes ADVANCE OSA DC 20 MHz dual trace DYNAMCO Por DC 15 MHz. Dual Trace 1 reV hurr F sensitivity Acoustic A MHz. Universal Module. DC 15 MHz. Dual Trace 1 mV HEWLETT PACKARD 50mV sens. 1MO sensitivity on CHI. Delayed BRUEL E1 KJAER Timebase Precision sound level meter A For psophometric A Time Interval Plug -in 10ns Octave filter set couples measurements from 20 Hz- 20kHz. MARCONI HEWLETT PACKARD mV V input level A Storage Div,ms. directly to Et TFA DC MHz 7 digits DC MHz. Dual trace Mains /Ext CEL NEC TF/ 8 DC MHz 7 Digits. DC LEO meter digital readout TTS37B. Noise, level and VU 10mV sens. Stab. day BCD 1 B DC MHz. Dual trace. measurement. Sensitivity' 80dBm P. Attenuators up to +20dBm O TF 2 As for 8 without Dual Time Base. MARCONI SANDERS B As with BCD O P VSWR Indicator. Batt-Mains STC Internal Battery fitted A Noise Generator CCITT RACAL A Storage Div-ms Bridges A Psophometer CCITT DC MHz 6 digits DC MHz Main frame only CINTEL Time interval Period Ratio WANDEL u. GOLTERMANN 10 Hz MHz 7 digits PHILIPS Measures iron core inductances DLM Send: receive system for 1 PM DC -1GHz. Sampling 0,01HH with a Q value not DC MHz 6 digits measuring phase jitter random noise oscilloscope less than 2) DC80 MHz 6 digits and frequency shift on data S.E. LABORATORIES TEKTRONIX DAWE transmission lines A 1A1. DC MHz dual trace Decade Capacitance box LDS Hz- kHz sender for SM DC MHz. 8 Digits. 50Mv.A,B.C, Input. Time Interval 5mV sensitivity Delayed timebase 1mF ,.( step 20 measuring group delay and 1A1. True dual beam. attenuation variations and Totalise MARCONI DC 50 MHz Can display 2 separate TF'Q' meter. Freq. range 1kHz LDEF Filters for DLM unit Data Loggers signals at different sweep rates. MHz using external osc. Counter Timers SOLARTRON Includes trolley WAYNE KERR HEWLETT PACKARD Data Transfer Unit and tr B 1A1. DC MHz dual trace A DC MHz 6 digits Channel Scanner with the Delayed timebase Plus low impedance adaptor A Display Module. 6 Digits following Man Units m A 3A6 3B1. DC MHz. Dual Measures L C R c ` 90 Universal Interlace v ' Trace. High persistence tube Measures L/C, R/G Accuracy a m Delayed Timebase Display Module. 8 Digits Digital Chit k of % Convoiter c A 82 DC 80 MHz dual trace Q V parameter test set. Plus Q A DC50 MHz. mV sens Scan Contaiiier o 10 mV sensitivity transistor adaptor unit Power Supply S 1A1. DC 50 MHz dual trace Time interval. Period. Ratio Cable Test Equipment Totalise 75 ' Dow' for Fri i IASC 11 DTB MARCONI B DC MHz. (Plug -on) Drive tilt Clary Primer 1A4 DC 50 MHz four trace TF Transmission Test set mV sens 'Filterl as ter-tumid DTB manicapital.com

9 WIRELESS WORLD, JUNE 7 Prices ROHDE Er SCHWARZ from/ SWOB 11 0 5 MHz W.! SCHAFFNER NSG Mains Interference Simulator. Superimposes manicapital.com un mains for testing Immunity u' equipment to interference Pulse amplitude. V Rise Time 0 25ps Width 50 Et s NSG Ignition Interference Attachment TEXSCAN 10 MHz Sweep generator with CRT display Spectrum Analysers NELSON ROSS DC kHz. 80d13 dynamic range Dispersion: Hz 6 kHz DC kHz. Dynamic range 60dB fits into various series CRO's TEKTRONIX 3L5. Pug -In unit fits into various series CRO's. 50 Hz MHz 1 Greater than 60dB dynamic rarity 1L20 Plug in fits various series CRO's 10 MHz 4 2 GHz 40rdB dynamic range Sweep Generators HEWLETT PACKARD Mainframe lilt Est AM Est FM 3 7 8 3 GHz 5mW PIN Prices Prices Prices levelled 'N' connectors from C Iran, f from f B 4 GHz 6mW. (20mW 1 A DC MHz. CRT Readout. Power Meters CHESSEL to 2 GHrl. PIN levelled 'N- Mainframe for 4 Plug-in 3 Pen Potentiometric. 1cm /s connectors MARCONI SAUNDERS TELEQUIPMENT 10 MHz GHz (Depending on 1cm /6min Ranges 25mV /10mV. T.V. Test Equipment Head) 12V DC power supply required. PHILIPS D DC MHz. dual trace 10mV sensitivity 10 MHz GHz 10mw 75 FERROGRAPH PMB Pattern Generator. D53A. DC 25 MHz. dual trace. DO MHz GHz mw 75 RTS2. Recorder test set, Wow and lines PAL. UK Systems 10mV sensitivity with C-2 plugn 10 MHz GHz 1mw 50 flutter etc. Vibration DC MHz with JD plugin 26, GHz 10mw 50 HEWLETT PACKARD DAWE D34 DC MHz dual trace Power Supplies M. 5 inch. Stripchart Single Pen CVIM) Portable Vibration Batt /Mains Portable 5mVV P20cm /min cm /Hr Analyser Kit D63 /V1 /V3 DC MHz. Depending OLTRONIX I on sensitivity. V or 1 mV A KV. 10 V up to 10 mA. RACAL Voltmeters -Analogue Current limit 2 mA. either Store 4. Uses D:'4 inch magnetic BRADLEY Sensitivity outputs 60 tape. Will record 4 F.M. channels. CTC. AC DC, SI current Oscilloscope Plug -ins ROBAND Operates at 7 different speeds. multeneter and RF 75 TEKTRONIX T 50V. 1A. Variable 15 SMITHS INDUSTRIES HEWLETT PACKARD Type R. Transistor R.T. tester. Pulse RE Single Pen 10m VV rate pulses /sec. R.T. Less than SOLARTRON A AC DC S2 mulumeter As 50V. 1A. Variable 15 FSD. Battery Operated XV and Strip A. 10 kHz GHz 5 mps Chart Type L. DC MHz. 5mV sensitivity STARTRONIC RE Single Pen. rnV V LIN STEAD fast rise time amplifier 30 , 20V. A. Variable twin 30 M2B DC AC 10 Hz kHz 25 FSD. 3 cm /min and hour Type G. Differential amplifier. Pulse Generators RE Pena V FSD. MARCONI CMR DC MHz. 50 mV sensitivity 50 8" Chart. 3 cm min and hour TF AC voltmeter to GHz Plug -ins for series DB ELECTRONICS 1 5 I.C. pulse generator 50 SOUTHERN INSTRUMENTS PHILIPS 1A1 dual trace Plug -in DC MHz PM lrnV V IO Hz 12 MHz 1A2 dual trace Plug -in DC MHz EH RESEARCH 10 6 channel U.V. Z in 19MS! DC O P 1A4 four trace Plug -in DC MHz D. Hz MHz 20V/50S2 mm; sec 1A5 Differential Plugin RT ins M 10 channel U.V Voltmeters -Digital Z Differential Plug -in 1 KHz MHz 5V/ mm /sec FARNELL 81 Adaptor Plug-in lA Series to RT 12ns Selection of Galvonometers DM FSD AC DC S! Series 75 L1. 10Hz MHz 10V available at f 15,00 each. Current Temperetuir 85 TELEQUIPMENT RT 5ns YOKOGAWA FLUKE Timing Unit 6 Channel A FSD DM64 Storage Divs /ms. 10 inch Chart Single Pen. 0 MHz 5V/50S2 RT 8ns 50 AC DC OHMS Current DC MHz Dual trace. mV VI /Pcm /minand/hr G 5V/50S2 30 Hz MHz RT 5ns D67 DC MHz. Dual trace. Dual AL. 50V/ 5 Hz 3 MHz 2 Pen Version of HEWLETT PACKARD Time Base. TV sync. RT 12ns Signal Sources and A A D75 DC MHz. Dual trace. Dual FSD AC DC OHMS Time Base. HEWLETT PACKARD Generators A V / Double pulse 0 /P. ADVANCE SOLARTRON D83 DC MHz. Dual trace. Large LM 2 ESE) DC only 0 06 '. 75 6'/4 CRT. Dual Time Base W5Ons ms. 10 Hz1 MHz'. 15ns RT FM AM MHz LM 2BA. FSD AC Oscilloscopes (storage) PHILIPS HEWLETT PACKARD True RMS DC PM Hz MHz. Typical RT CD. 5 Hz kHz 0/P 10V RMS 75 A FSD DC only DYNAMCO fins Output V 5 Hz MHz. ? 80d13 att. DC30MHz. Dual trace. A FSD AC DC 12 PM 3V Hz Mz. 1 O'P 5V RMS Sensitivity 11,V DC. V AC. Writing speed 20ps /Div. Rise /fall Times less than les. D As for (Battery m12 resistance) TEKTRONIX Recorders and Signal operated) A FSD AC DC St , 1A1. DC MHz. 5mV E. MHz AM A FSD AC DC sensitivity. Dual trace. Storage Conditioning Equipment C. GHz FM Srnsitrvny lyV DC. tO0V AC I scope, Writing speed: 5cm ps with AMPEX MARCONI 10m52 resistance) enhancement. Includes trolley PR Instrumentation Recorder TF FM Deviation Meter Auto AC DC !! /3A74/3B4. DC-2MHz, four up to 16 channels. FM /DR. Record 4 MHz 95 Auto AC DC S. channel. 20 mV sensitivity. Writing replay all speeds. 1" tape FM /DR speed up to cm /ms I.R.I.G. DC kHz FM. Hz- TF D1. MHz AM. FM. Wave Analysers TFA 2. MHz AM. FM. /3A6/2B DC MHz. Dual kHz DR TFB 5. MHz AM. FM. HEWLETT PACKARD trace 1OmV sensitivity, split screen A. 20 Hz 50 kHz 75dB range BRUNO WOELKE TFA. Two tone 20 Hz KHz storage oscilloscope MEB. Wow and flutter meter 75 MARCONI Phase Meter PHILIPS TF 20 Hz 50 kHz Selective MEC. Wow and flutter meter 90 PM kHz MHz. Digital DRANETZ BRUEL Range 35 lo 80Hz Dynamic Er KJAER display of frequency. AM. FM. A 5 Hz kHz. Z in k Bench type. Mains operated. Sweep facility for I.F. measurements range 75,18 Accuracy '1 to r2 . Analogue Log recording of AC 2 Hz kHz PM FM Stereo generator. WAYNE KERR 0/P and DC or mm paper width.. RF output MHz A 20 Hz KHz Sens 75B C Carlton Carston Electronics Limited Shirley House. 27C,imdf?I1 Ro, id. London NW19NR Telex Redundant Test Equipment Why not turn your under -utilized test equipment into cash? Ring us and well make you an offer. Contact David Kennedy or Noel Jennings /2 VAT charged at Standard Rate WW FOR FURTHER DETAILS manicapital.com

10 THINK OF A SHAPE 8 WIRELESS WORLD. JUNE S D - dual channel up to W /RMS per channel DC KHZ Whatever it is, the S' range HIIH of power amplifiers will handle it The HIIH 'S' range isdesigned to handle heavy industrial usage in the fields of vibrator driving, variable frequency power supplies and servo motor systems. S D S Dual Channel Single Channel 19" rack mount 31/2" high 19" rack mount 31/2" high w r.m.s. into ohms per channel w r.m.s. into ohms w r.m.s. in bridge mode Retro -convertible to dual channel DC KHZ at full power DC KHZ at full power % harmonic distortion (typical) at full short and open circuit protection w r.m.s. into 4 ohms at KHZ 1 Drives totally reactive loads with no 3KW dissipation from in -built force cooled adverse effects dissipators A complete range of matching transformers and peripheral equipment for closed loop, constant current and voltage use are available. Alternative input and output termination to order. Rack case for bench use built to specifications. For complete data write or call. Kirkham Electronics MILL HALL, MILL LANE, PULHAM MARKET, DISS, NORFOLK IP21 4XL DIVISION OF K.R.S. LIMITED TELEPHONE ( ) / FRANCHISED COMMERCIAL AND INDUSTRIAL AGENTS FOR WW - FOR FURTHER DETAILS HUH ELECTRONICS manicapital.com

11 WIRELESS WORLD, JUNE 9 Get 24 DMMs off the shelf. Turn to page 3 of your ITT Instrument Services catalogue for a list of top names Thandar (Sinclair), Fluke, Avo, Keithley and Norma. Compare performance and specification then phone or telex Harlow or any local ITT office and we'll deliver off the shelf. The ITT Instrument Services catalogue is your key to fast delivery and technical back -up for a vast range of quality instruments. Get it off the shelf. ITT Instrument Services Edinburgh Way, Harlow, Essex CM20 2DF. Tel: () Telex: ITT instrument services the only way to buy. WW - FOR FURTHER DETAILS Get a Gri The Logic Monitor 2 by CSC provides greater e o your versatility and precision in testing all types of The LM2 just clips over the I.C. and displays instantly and automatically the logic state of the 's digital circuits. I.C. elements. It incorporates a fully isolated power supply If you want to hear more of this gripping which means that there is no loading of a story then just send the coupon off or circuit under test; avoids logic level shifts, better still place an immediate order false triggering and power supply loading. with your Access, American Express The self contained power supply in or Barclaycard. conjunction with I.C. comparators (exluding P &P and 15% VAT). provides constant current drive to LEDS For immediate action and ensures a uniformly bright display. The C.S.C. 24 -hour 5 -day a week service. A logic family selection switch enables Tel: () and give us the precise selection of logic thresholds your Access, American Express, and provides more accurate measurement Barclaycard number and your order of I.C.'s under test. will be in the post immediately. CONTINENTAL SPECIALTIES CORPORATION C.S.C. (UK) Ltd., Dept. 7DD Unit 1 Shire Hm Industrial Estate. Saffron Walden. Essex C 3A0 1 For FREE catalogue I tick tex Name I 'Address I C.S.C. (UK) Limited, Dept.7DD Unit 1, Shire Hill Industrial Estate, Debit my Barclaycard. Access Ame,Ican E rpres5 I - Saffron Walden, Essex CB11 3AQ Tel: Saffron Walden () Telex: WW - FOR FURTHER DETAILS No Exp date ______ J

12 manicapital.com

13 We mean it The new 30AX colour tube system from Mullard doesn't need innumerable twists and turns of a screwdriver to set it up. It needs no adjustments at all. Because every one has been 'designed out Every tube that leaves our factory is completely pre -adjusted by us. Leaving only the turn of one screw to affix or remove the coil. No dynamic convergence adjustments. No colour purity adjustments. And no raster orientation adjustment As for what it has to offer, the 30AX's focus is sharper and its definition greatly improved. Its in -line guns and specially built coil provide the best picture shape yet And rest assured it'll stay that way. In a slim package that trims about 3" off conventional 22" 90 TV cabinet depths. Some features of the 30AX however, are a little more established. Like its excellent colour registration. High brightness. Soft flash protection. Fast warm -up. And of course, greater overall reliability. This is the new 30AX colour tube system. For more information just write your name and address on this page and send it to Dept. MCG 2, Mullard Ltd., Mullard House, Torrington Place, London v WC1E 7H D. Mullard 30AX. The perfect slimline. WW - FOR FURTHER DETAILS manicapital.com

14 12 WIRELESS WORLD, JUNE BREMI ELETTRONICA Via Pasubio 3/C Parma - Italy Tel. / - Telex: !; ccia pr I for BREMI R EM1 nM r . EM1 manicapital.com-Fe r. om manicapital.com i FL LI I -t :. ' .}!; -. r_ b ? ? GI IBNI NI .F MI \m - + .r., .. . _Q/ _1) RR F M l,v.m "'"'"v I]00I]IJ0Q O O OREMI ..M.. . .. . .. \ manicapital.com . : - REMI ', F-\ ,. tlllt R aeat I p - .0 v+ DC POWER SUPPLIES a vast range PSICHEDELIC LIGHTS EQUIPMENT METAL DETECTOR suited to meeting both amateur andvarious models of light modulators, professional requirements with /without microphone, strobosco- AUTOMATIC BATTERY CHARGER MEASURING INSTRUMENTS Digital pe, spot lights etc. frequency meter, digital capacity EQUIPMENT FOR CB linear amplifiers, Our articles, meter which are of top quality, S.W.R. meter, wattmeters are known and exported worldwide. WE ARE LOOKING FOR AN EXCLUSIVE IMPORTER well introduced on the English market for all our articles and for some lines of our product. WW - FOR FURTHER DETAILS manicapital.com

15 WIRELESS WORLD, JUNE 13 (tisements Input des8 pm(ess onw Tesehangmg thwd op1oy on nd toc ryfnents ervice. needs of oshop wind ffsPhmps and we will b sh0 y tick th ucts toPfOduct.u5e ouP nQ require lot of Prod o the uf specific They fen 1 Instrumente h0ye about of course, relecLing Y Measuring because in( rmrheod{ or. ck full P ffeWhere Y und address. of detailed Inl rmouon return re ewe In ou Wail! The PM has set the standard and the pace in Europe for hand -held digital multimeters - and still it remains in a class of its own. Remember, its many important features include full four digits, so on mains voltage readings, for example, you might get instead of the , which a 31 digit meter would read. Some other PM plus points: LED or LCD display True'RMS readings of AC voltage and current Autoranging with manual override Optional accessories include temperature and data hold probes MULTIMETERS Reader inquiry number NO WAITING FOR THESE OSCILLOSCOPES TOP PRODUCTS The PM Super Scope - - is a tough, Auto triggering from either channel with general purpose oscilloscope which offers adjustable level between peaks and TV at a low price the quality and technology triggering you expect from Philips Test and Measuring 5 m' sensitivity, Y and X (via A input) instruments. B invert facility 15 MHz dual trace Reader inquiry number Both these instruments are available off the shelf from the Philips Electronic Instruments Department (see address below) or from the following distributors. British Tungsram, GREAT COUNTERS MYSTERY West Road, Tottenham, London N 17 ORN. Tel: Philips Service Centres (25 throughout the country). Tel: for the address of your nearest branch, Wessex Philips engineers have encountered the same High contrast liquid crystal display Electronics Ltd, North Street. Downend, Bristol BS 16 1 reaction from customers and competitors alike Self diagnostic routine 55E. Tel , when showing off the new microcomputer High stability TCXD: I0 7/month .controlled PM ( MHz) and PM Battery option inquiry no (IGHz) frequency counters: "How do they do it PM multimeter for the price ". Here's a brief summary of what ? PM oscilloscope the counters offer. PM /8 counter Reciprocal frequency counting (for higher resolution without I cycle error) Auto -triggering on all waveforms Pye Unicam Ltd Phipps Eectroo :. Instruments Dept . Reader inquiry number York Street Cambridge_ England CB1 2PX VV Tel Cambridge ) Telex PHILIPS G Test & Measuring Instruments PHILIPS WV,' - FOR FURTHER DETAILS manicapital.com

16 14 WIRELESS WORLD, JUNE The sweeps the board at only 75 Get all the waveforms you need -1 Hz to 1 MHz in five overlapping ranges: stable, low- distortion sine waves, fast rise /fall -time square waves, high linearity triangle waves - even a separate TTL square wave output. Plus high- and low -level main outputs. An applied DC Voltage at the Sweep input can shift the 's frequency: or sweep up to 1 with an AC signal. A pushbutton activates the DC Offset control, which shifts the output waveform up .Noor or down on command. For value for money the sweeps the rest off the board. For immediate action - The C.S.C. 24 hour, 5 day a week service Tel: () and give us your Access, American Express, Barclaycard number and your order will be in the post immediately or just clip out the coupon. 'price excluding P&P and 15% VAT CONTINENTAL SPECIALTIES CORPORATION Continental Specialties Corporation (UK) Limited Dept 7HH Unit 1, Shire Hill Industrial Estate, Saffron Walden, Essex. CB11 3AQ Model Sweepable (inc. P&P ! Qnty For FREE catalogue Function Generator and 15% VAT) Regd. i tick box Name Address C.S.C. (UK) Limited Dept. 7HH Unit 1,Shire Hill Industrial Estate, enclose PO /Cheque for I or debit my Saffron Walden, Essex CB11 3AQ LBarclaycard /Access /American Express No exp date Tel: Saffron Walden () Telex WW - FOR FURTHER DETAILS THE MEDIAYOU WANT, W OU WANT IT. FAST FROM ECIALISTS_- - Complete the details below and send the coupon back to us. S ee for yourself the im- 3M manicapital.com always have been. the Media 1 provement the Minicomputer Media Service Specialists. We don't make computers.' can bring you in reliability und performance. only the media they depend on From raw material to finished product. 1 3M R, The Minicomputer Media Service. every item is produced entirely in- house: 1 NED/A BERME >M United Kingdom Ltd. As media specialists, we bring you Britain's REEPOST. Bracknell. Berkshire RG12 1BR. most comprehensive range of minicomputer 1 Telephone. Bracknell ( media: Scotch manicapital.com 1 My business h is a data cartridges. Scotch disk cartridges. 1 minicomputer which uses Disk cartridges Scotch diskettes and minidiskettes Digit,l c.,ssettes Data Lirtridges Furthermore, we hold enough Diskettes Minidiskettes -Other items 1 I - Bonton ()lease specify) stocks to promise immediate supplyofall media in common Please ask your specialist s,,manicapital.com loc,il use. You can order by phone 1 distributor to c,dl me Please send me more or in writing. from us direct 1 information on your service o or from our network of local 1 Nime `gin distributors Position lukttraltimi 1 manicapital.com Address Tel No WW - FOR FURTHER DETAILS manicapital.com

17 WIRELESS WORLD, JUNE 15 .r.,rT.r' T TIM 11 I Nil I+ I 6 Mil IIIIIIII,III! Component cutter - ORYX Lightweight, Miniature 6 volt inexpensive soldering station PSU -6 Temperature Vacuum based A complete station controlled p.c.b. holder for precision Will take a range soldering iron soldering The famous of vice heads ORYX 50 ndlllfr Elfi Iir,iGr 1, G.P. 27 watt soldering iron The ORYX Super 30 Miniature mains iron, 17 watts Model M3 Bench vice -B 1 Pyrometer Highly versatile for soldering and drilling Complete and self operations contained for tip temperature High reading Safety stand powered For ORYX 50 desolder- T C and Super P ing tool 30 irons SR -2 Desoldering tool SR 3A S toy Desoldering ilW{tl tool SR 3A ifh.,. yi,yy'manicapital.comi'.I s All these Desoldering i*A.Y':Ir'M2I SR 3A Micro Precision vice Beautifully and more engineered' rotating head with tilt make u p the widest range of professional Miniature g soldering ,-- solder pot Ideal for workshop or laboratory products. Ask us for our full information pack. 'Quick Charg 1 cordless soldering iron Zr) Will r3o only 3 to 4 hours Greenwood Electronics Portman Road. Reading. Berks. RG3 1NE Tel: () Telex: WW - FOR FURTHER DETAILS manicapital.com

18 16 WIRELESS WORLD JUNE 19',u SOFTYSoftware Development System FXS MICROSYSTEM DEVELOPMENT USING SOFTY SOFTY is intended for the development of programs which will eventually become Hilomast Ltd software residing in ROM and forming part of a microsystem. During the development stage of a microsystem, SOFTY will be connected in place of the firmware ROM via a ribbon cable, terminated in a 24 pin OIL plug. Data may be entered into the SOFTY RAM via the serial port, parallel port, direct memory access, or the keypad, and manipulated using the assembler key- functions. When the program has been entered, the internal microprocessor can be 'turned off', and the external microsystem and its resident microprocessor allowed to access and run the program in SOFTY's RAM and /or programming socket. In this way modification can be made until the required program .s complete - the contents of the RAM being clearly visible as a'page' on TV or monitor. 4 pages are available,2 of the Data RAM an 2 of the programming socket. In the end, when the program is complete and working, the DIL plug is removed and replaced by an EPROM device programmed by SOFTY SOFTY is able to program the - // family which have 3 voltage rails we supply with each SOFTY details of a simple modification which allows SOFTY to program the single rail / etc. (If you want to program EPROMs/PROMs other than the / / 6 family, we may be able to help you development.) -our range of add -on Programming Modules is currently under To help in the process of program development SOFTY has various assembler key- functions, which include - block shift without overwriting, block store, cursor control, match byte and displacement calculations (for jumps, etc.) A high speed cassette interface is also provided for storing working programs and useful subroutines. Software is supplied for serial data transfers - which means that you can write an assembler for your favourite MPU in BASIC on your Superboard. UK, NASCOM, etc. and transfer the hex code directly to EPROM via SOFTY. The serial transfer program runs in the scratchpad and can be easily loaded from cassette, or the programming socket. Besides software development and EPROM programming. SOFTY has other uses - as a training aid, or as a control computer in its own right, with up to 2K bytes firmware, 1K of RAM, 22 I/O ports and Direct Memory Access. SOFTY Kit-of -parts (including zero insertion force socket for EPROM programmer). Price E (inc. VAT, P &P). SOFTY Built and tested - Et 38 (inc. VAT, P &P). Built conversion card for programming single rail EPROMs (with ZIF) - E46 (inc. VAT, &P). P Built SOFTY power supply -E23 (inc. VAT Write or telephone for full details , P &P). MODEL 14 EPROM ERASERS Fk 1 1 MODEL UV EPROM ERASER Fast erase times (typically 20 minutes for EPROM) 14 EPROM capacity Built -in 5 to 50 minute timer to cater for all. EPROMs Safety interlocked to prevent eye and skin damage Convenient slide -tray loading of devices MAINS and ERASE indicators Rugged construction Priced at only E (inc VAT. p &p) MODEL UV EPROM ERASER Similar to Model UV but without timer Low price at only E (inc. VAT, p&p) WRITE OR TELEPHONE FOR FULL DETAILS OR SEND CHEQUES /OFFICIAL COMPANY ORDERS TO. HILOMAST LIMITED THE STREET HEYBRIDGE ESSEX CM9 7NB ENGLAND MALDON- GP Industrial Electronics Limited Tel. MALDON () (Retail Sales), Skardon Place, North Hill, Plymouth TELEX NO. PL4 8HA- Telephone: Plymouth () TRADE AND EXPORT ENQUIRIES WELCOME WW - FON FURTHER DETAILS WW - FOR FURTHER DETAILS manicapital.com

19 WIRELESS WORLD, JUNE /JULY 17 wireless world ELECTRONICS/TELEVISION/RADIO/AUDIO Multiaection equalizer Oeamomnce metal detector JUNE /JULY Vol 86 No 1 Front cover shows interior of an English Electric Valve Co. magnetron (cutaway model) for use in radar systems. Pho- 37 Producers before products tographer: Paul Brierley. 38 Community radio IN OUR NEXT ISSUE by Norman McLeod Graphical communication with computers introduces the technology of interac- 42 World of amateur radio tive computer graphics and describes input and output methods for information in this form. 43 Multi- section tone equalizer by C. Walker and W. Clinch Transient recorder. Con- structing an instrument which captures one -shot 47 Off -resonance metal detector events for later display on by G. Wareham an oscilloscope or chart recorder. Memory con- tents can be examined 50 News of the month word -by -word. Electronics in Defence -lines to close Set makers grapple with technology Solid-state level meter. This solid -state indicator, 53 Wideband audio power amplifiers using 20 manicapital.com of any col- our mix, offers a.c. or d.c. by Y. Miloslayskij and dot or bar operation. 55 Analogue computing techniques by David F. Dawe Current issue price 50p, back issue If available) , at Retail and Trade Counter, Paris Garden, Lon- don SE1. Available on microfilm: 61 Letters to the Editor please contact editor. Interference with MSF Scientific computer By post, current issue 86p, back issues (if available) , order Wet aerial insulators at sea and payments to Room CP34, Dor- set House, London SE1 9LU. Editorial & Advertising offices: 67 Designing with microprocessors -2 Dorset House, Stamford Street, by D. Zissos and L. Valen London SE1 9LU. Telephones: Editorial 01 Advertising 01 Telegrams /Telex: Wiworld Bis - nespres BISPRS G. Cables 70 Programmable audio attenuator by J. M. Didden - 2 Ethaworld, London SE1. Subscription rates: 1 year UK and $31 outside UK. Student rates: year, UK 1 75 I.E.E.E. bus standard and Si outside UK. Distribution: 40 Bowling Green by P. R Ellefsen Lane, London EC1R ONE. Telephone 01 Subscriptions: Oakfield House,' 79 Extending mobile radio coverage Perrymount Road, Haywards Heath, Sussex RH16 3DH. by W. M. Pannell Telephone Please notify a change of address. USA mailing agents: Expediters of the Printed Word Ltd, Madison Avenue, Suite 21 7. New York, NY 1 85 Colour tv receiver design by R. Wilkinson - 1 2nd -class postage paid at New York. IPC Business Press Ltd, ISSN 90 New products Ibpa I ABC 92 Sidebands ( by Mixer

20 WIRELESS WORLD, JUNE /JULY 18 Quantum Electronics - NEW PRODUCTS NEW PRODUCTS Our product range for the 80s is outlined but it is impossible to cover everything in such a small space. For detailed information and a price list send a large SAE or a dollar bill. PRE -AMP & POWER AMP KITS P3 Universal chuck The pre -amp is now available in kit form in versions to suit any cartridge and consists of the 17 55 Module C2 (below) and the hardware kit H K 1. No soldering is involved and assembly take - pp 50p pp p about 20 mins. There are six power amp kits. four mono and two stereo, from 45 to W to satisfy virtually every requirement. They use ready -built and tested p.c. boards to achieve an ease of construction similar to module based kits at lower cost. There are also mains supply kits to enable independent use of the pre -amp, which is normally powered via our power amp. Similar manicapital.com also available ready-built from us or via our dealers. C2 + HK1 E P2 (stereo 45W per channel) kit P4 (stereo W per channel) kit MOVING -COIL & PRE -AMP MODULES plus all the accessories GRINDING STONES rene Grade ,o, Meni Wood. Piasrrc Gian \/'SPAST DRILLS f 5m up to 2 40p each STI 2 III Z 4 li 1 50p ea BURRS WIRE BRUSHES C2 (C2mc) '/ 3 sizes. Also tungsten* 1 1 V WO lep: rill MCI Previously restricted to trade and export, the C2 pre -amp module is now available separately 1 i i 50p in 3 versions to match any cartridge. It has unbeatable specifications, caters for disc + 18 to 35V BI* 2* 3* 4 5 6* T ea. auxiliary and 2 or 3 head tape machines and requires only a rough supply of d c The new moving coil pre -pre -amp achieves low thd, high overload, good r. f., rejection 50p ea. 31 +Tungsten WI ? and good noise performance without resorting to the expensive multiple transistor design p i Only tantalum capacitors and metal oxide resistors are used in the signal path and it can be powered either via the C2 or by a battery. Hardware kits are available to build both types and POLISHERS CARBORUNDUM they are also available ready -built. . DISC WHEEL MC1 Module E C2mc E 11, PIE 1 31 4 50p ea. CI 50p ea. *C 2 Post and packing, any quantity 30p Above are illustrated lust a few of the many accessories available in the range to fit these drills. For full details. ask for Accessories leaf- let. All items are subject to availability from manufacturer. POWER AMP MODULES AND SUPPLIES The power amp modules are now also available to retail customers in a variety of powers and formats up to W r.m.s. They use the same high performance circuitry as the kits above. giving t. h.d. below 01% at I kHz, but are capable of sustained high level use with excellent reliability. There are power supplies for use with any one or two of these modules. all of which use toroidal transformers. also available separately The module illustrated is a Write for full details of range to medium duty W r.m.s. type. the M which requires the MS3 supply. M MS3. Sole UK Distributors Exports: We can deal efficiently with orders to any country Please write with your specific requirements for a quote by return. All equipment can be wired for V mains. PLEASE NOTE: OUR NEW ADDRESS FROM 1st MAY PRECISION PETITE LTD 8 ALBION STREET, LEICESTER. Tel: a HIGH STREET TEDDINGTON MIDDLESEX TWO 8HG OX DISCO, BOX CLAYMONT, DE , U.S.A. Tel. 1- TEL: 01 MINIC TELEPRODUCTOR, BOX , S 12, UPPSALA 12, SWEDEN WW - FOR FURTHER DETAILS manicapital.com

21 How.. Why.. When? Distress calls are made every recording arises -a need for a For details write to: day- hundreds each year, and in system with instant message Racal Recorders Limited every case questions are asked. trace and replay -at the touch of Hardley Industrial Estate Questions which require a button -and at any speed to Hythe, Southampton, accurate, up -to- the -minute assist intelligibility. Hampshire, SO4 6ZH England. answers. Answers that can only All these facilities, and more, Telephone come from reliable and are available in the Racal Telex immediately accessible Recorders 'Callstore' cassette communications recordings. recorder /reproducer. Actuated When police, ambulance, fire, local ATC and other services either by incoming audio signals or by local or remote GICHErl are called upon, either by radio control, Callstore uses four or telephone, they often receive cassette transports, each giving hasty, garbled messages - up to four separate channels, sometimes several at a time. including a search control In such instances a positive track which is cued at the need for communications beginning of each message. Callstore, from Racal Recorders, answers all the questions. ww - FOR FURTHER DETAILS manicapital.com

22 20 WIRELESS WORLD, JUNE /JULY Britain's first corn computer kit. The Sinclair ZX Price breakdown .. =\\\\\\"-\\\` .q\-\\\\\`, \\= ..\\,,,,, ,,,,,,,,,,,,\\\, \qNpU ,,,.. \\\NNpu\\ \\ \\uu\0\ ZX80 and manual: VAT. Post and packing FREE Cti CCH.a FUMOr,O a \\\ \ ergs EEK US \ Please note: many kit makers quote VAT-exclusive prices rL $ Alas \,' \\i\\\ n\ wo'\Q\S a``\\\\\, \\\\ \\`,\\\ `` \ \\ `\, You've seen the reviews you've heard the excite- E MUN .\\\O ment now make the kit! This is the ZX 'Personal Computer World' gave [/'yT , `rn.7o !`\1\\ `\\\\ \t T \ REM tQ\ \\\V ~oME RuepV T. it 5 stars for 'excellent value: Benchmark tests \\ \` `` R , 1\\ \\` NT\a\\ say its faster than all previous personal com- ;[\`\j\`j`j+ \ RqN \\\\\` e A\ ` puters. And the response from kit enthusiasts "1\\\\,'\\\\\i \ \ \\ E\ has been tremendous. To help you appreciate its value, the price is .. Q\\ t\\\\`\\ \\\\\ d\\\\i\UR1E'R!l\@ shown above with and without VAT. This is so you can compare the ZX80 with competitive kits that don't appear with inclusive prices. .`\ NE;\, \:.,,\\\\\`.i K 'Excellent value' indeed! The unique and Forjust (including VAT and p &p) you valuable components of the get everything you need to build a personal computer at home PCB, with IC sockets for Sinclair ZX The SinclairZX80 is not just another all ICs; case; leads for direct connection to a Fewer chips, compact personal computer. Quite apart from its cassette recorder and television (black and white or colour); everything! exceptionally low price, the ZX80 has two design, volume production - uniquely advanced components: the Sinclair more power per pound! Yet the ZX80 really is a complete, powerful, BASIC interpreter; and the Sinclair teach - full -facility computer, matching or surpassing The ZX80 owes its remarkable low price to yourself BASIC manual. other personal computers at several times its remarkable design: the whole system is The unique Sinclair BASIC interpreter offers the price. remarkable programming advantages: packed on to fewer, newer, more powerful The ZX80 is programmed in BASIC, and you Unique 'one- touch' key word entry: the and advanced LSI chips. A single SUPER ROM, can use it to do quite literally anything from ZX80 eliminates a great deal of tiresome for instance, contains the BASIC interpreter, playing chess to managing a business. typing. Key words (RUN, PRINT, LIST, etc.) the character set, operating system, and The ZX80 is pleasantly straightforward to have their own single -key entry. monitor. And the ZX80's 1K byte RAM is assemble, using a fine -tipped soldering iron. Unique syntax check. Only lines with correct roughly equivalent to 4K bytes in a conven- It immediately proves what a good job you've. syntax are accepted into programs. A cursor tional computer - typically storing ines of done connect it to your TVlink it to an : identifies errors immediately. This prevents BASIC. (Key words occupy only a single byte.) appropriate power source* and you're entry of long and complicated programs with The display shows 32 characters by 24 lines. ready to go. faults only discovered when you try to And Benchmark tests show that the ZX80 run them. isfaster than all other personal computers. No other personal computer offers this Excellent string -handling capability - takes Your ZX80 kit contains unique combination of high capability and up to 26 string variables of any length. All Printed circuit board, with IC sockets for low price. strings can undergo all relational tests (e.g. all ICs. comparison). The ZX80 also has string input - Complete components set, including all to request a line of text when necessary. Z80 A microprocessor - new, Sockets for TV, ICs -all manufactured by selected world - faster version of the famous cassette recorder, Strings do not need to be dimensioned. leading suppliers. Z microprocessor chip, power supply. Up to 26 single dimension arrays. New rugged Sinclair keyboard, touch - widely recognised as the best sensitive, wipe -clean. FOR /NEXT loops nested up ever made. SUPER ROM. Ready- moulded case. Variable names of any length. Clock. UHF TV Rugged, BASIC language also handles full Boolean modulator. Leads and plugs for connection to flush, arithmetic, conditional expressions, etc. domestic TV and cassette recorder. Exceptionally powerful edit facilities, allows Sinclair (Programs can be SAVEd and LOADed keyboard. modification of existing program lines. RAM chips. on to a portable cassette recorder.) Randomise function, useful for games and FREE course in BASIC programming and secret codes, as well as more serious user manual. applications. Optional extras Timer under program control. Mains adaptor of mA at 9 V DC PEEK and POKE enable entry of machine nominal unregulated (available code instructions, USR causes jump to a separately -see coupon). user's machine language sub -routine. Additional memory expansion boards High -resolution graphics with 22 standard allowing up to 16K bytes RAM. (Extra graphic symbols. RAM chips also available -see coupon). All characters printable in reverse under Use a mA at 9 V DC nominal unregulated mains program control. adaptor. Available fromSinclair ifdesired (see coupon) Lines of unlimited length, manicapital.com

23 WIRELESS WORLD, JUNE /JULY 21 plate 4 LET 1 =1 Ea 1:^ i1 1 TNFUT LI(i 1 7 FRI NT P

24 22 WIRELESS WORLD, JUNE /JULY Compact, versatile field service monitors for two -way radio maintenance CE A: FM /AM Field Service Monitor CE- 50A FM /AM Field Service - Spectrum Monitor Exclusive representative Aspen Electronics Limited Communications Equipment and Components 2 Kildare Close, Eastcote, Ruislip, Middlesex HA4 9U; Telephone: 01 1 Telex: WW - FOR FURTHER DETAILS 4 METER PROBLEMS? Recognise me? If you do you should know your authorised Avo Sales and Service Centre Quick turn round on estimates /repairs Large stocks of new AVOMETERS Standard Ranges in a variety of sizes and stylings available for 10 Farnell International clays delivery Other Ranges and special scales can be inade to order Farrell International Instruments Ltd., Sandbeck Way Wetherby West Yorkshire LS22 4DH , Full Information from: Tel Telex Farist G HARRIS ELECTRONICS (London) GRAYS INN ROAD, W.C.1 Phone: WW - FOR FURTHER DETAILS WW - FOR FURTHER DETAILS manicapital.com

25 WIRELESS WORLD, JUNE /JULY 23 "I NEVER KNEW COLOUR VIDEO COULD COST SO LITTLE" Don't be put off by what you may have heard - or imagined sound track to use for foreign -language commentaries or - about the cost of colour video. question-and -answer training routines. Talk to Bell & Howell or one of our Video Centres and On 3/4-inch, moreover, you'll be in the right format to get the current facts. edit and duplicate - or add in library manicapital.com still The fact,for example,thata portable JVC colour camera costs little more than an ordinary black- and -white camera. And the further fact that by adding a JVC VHS you have a complete colour recording system for as little as 11, plus VAT For playback, a standard TV receiver is all you need. the cost of the system needn't exceed 12, plus VAT. Alternatively, at very attractive rates, it can be leased. TALK FIRST, PAY LATER You can, of course, spend more. At any Bell & Howell At these prices every user can benefit from colour. Video Centre you'll see more expensive cameras, video Training will be easier to understand; publicity more recorders and electronic editing equipment that wouldn't compelling; management communications more be out of place in a national network. interesting; rle- playing more effective. After all, we live in But do you need them? a coloured world. Letthe Video Centre,or Bell & Howell, help you decide. PUSH -BUTTON FEATURES Whatever your decision, two things are certain. Don't think for one minute that the low price has been One, colour video now costs a lot less than it used to achieved at the expense of useful features. Among other (as well as being highly dependable and very easy to use). things the camera has an iris control which automatically Two, every unit in the system you choose qualifies for adjusts lens aperture to match lighting conditions;a the Supershield warranty, unique to Bell & Howell. power or manual zoom,giving close -ups as close as 50 mm; Under Supershield, all adjustments, repairs and HL indicators which automatically show exposure level, replacements (except for tubes and tapes) are free for auto -white balance. operating mode and power level. two years after manicapital.com if a job can't be done on BETTER STILL the spot we also provide free transport anywhere in Or, if you feel inclined to make even fuller use of the mainland Great Britain to and from a fully equipped camera's capabilities, couple it to a JVC J/+ -inch U- format supershield video workshop. recorder. Convert to (or start) with colour. With JVC video The picture will be improved. You'll have another manicapital.com the Bell & Howell Supershield guarantee. Let Bell & Howell show you the answer. To Pieter Glas. Bell & Howell A -V Ltd.. Freepost, Wembley. Middlesex HAO 1BR. Please send me more information about video equipment and a list of your Video Centres. Name Organisation Address i.A . 'ti 1. ' i i i J. r, i WW t - t. wws,h FOR FURTHER DETAILS manicapital.com

26 24 WIRELESS WORLD, JUNE /JULY Advertisement produced co- operatively by: Akai, Ferguson, manicapital.com

27 WIRELESS WORLD, JUNE /JULY 25 got. it right, t from the start. Believe it or not, 2 out of every 3 home video recorders sold or rented in this country in were VHS models. VHS was also the most successful home video system worldwide. That represents a pretty overwhelming vote of confidence. How did we manage it? At the outset we were determined to produce a home video system that was nothing short of manicapital.com's why VHS offers standards of reproduction, reliability and compatibility that are quite simply second to none. And of course, if you build a better system in the first place there's less need to change it later on. So while we have continually improved the quality of our recorders - there are now triple standard VHS machines which accept PAL, SECAM and NTSC -we have never changed the design of the VHS cassette. And it will not change in the future either. Which is more than can be said for some of our competitors. By maintaining the same cassette, VHS has become the most compatible system available. So your customers will find it much easier to swap tapes with friends and Theworld's No.1 system. enjoy the greatest range of pre- recorded material too. VHS is the No.1 system in the UK, Europe, the US and Japan. Make sure you've got it. Right? Hitachi, JVC, Panasonic, Sharp. WW - VAIS FOR FURTHER DETAILS

28 26 WIRELESS WORLD, JUNE /JULY The Thandar 10MHz Portable Oscilloscope A low weight, low power Oscilloscope that provides workshop facilities but with true portability + VAT The Thandar Portable Oscilloscope is a breakthrough in development. Now, for the first time, every engineer, service -man and technician r i Sinclair Electronics Ltd, London Road, manicapital.com, Huntingdon, Cambs, PE17 4HJ. Please send me further technical WW2 information, price list and stockist list of can carry with him this piece of electronic test gear i the Thandar Portable Oscilloscope. I am also interested in weighing less than 2 pounds, yet having the Digital Multimeters performance of most standard bench oscilloscopes. Pocket Multimeters The Thandar Portable Oscilloscope is less than 2" Pocket Frequency Meters thick. It is based around a 2" diagonal CRT and i Name: has a 10 MHz bandwidth with sensitivity down to Address: 10mV per division. Full trigger facilities are provided, including Bright Line Auto with TV Line and Frame positions. The superb ergonomic design of the Thandar Portable Oscilloscope enables it to Sinclair Electronics Ltd., thandar be carried in a briefcase or toolkit. It can be held in London Road, St. Ives. one hand or operated whilst hung around the Huntingdon, Cambs., PE17 4HJ. neck. Tel: Telex: Send now for further details or call at your local Sinclair Electronics Ltd. reserve the right to alter I I prices and specifications on Thandar equipment SINCLAIR ELECTRONICS LTD Thandar Stockist. without prior notice WW - FOR FURTHER DETAILS I III I 1_11 I I .. 1_I 1_I Lasc ar's new 1_I 11_11 1 1 9Lj1 1 range of DIN -Cased Digital Display Products are low -cost, compact alternatives to electro-m,t-hantca l products. Ihey ttrve, high levels of aecuracy and enhance the appearance of any instrument or panel. The range includes counters, panel meters, timers, frequency meters and thermometers. LED or Liquid Crystal displays are available It's in a variety of digit sizes. All prices are I -off and never exclusive of VAT. Large discounts available to OEM users been easier or cheaper 1 off 1, off 3'i Digit LED Panel Meter )3. M Digit LCD Panel Meter 4I, Digit LED Panel Meter 4 Digit LED Counter 4 Digit LCD Counter ti 6 Digit LED Counter 8 Digit LED Universal Counter -Timer La5Car Electronics O UNIT 1, THOMASIN ROAD, BURNT MILLS INDUSTRIAL ESTATE, BASILDON, ESSEX SS13 1LH TEL: BASILDON () WW - FOR FURTHER DETAILS manicapital.com

29 WIRELESS WORLD. JUNE /JULY 27 MORE SPEC. FOR YOUR MONEY Electronic components from TYPE FILTER OSCILLATOR & carriage, ins etc. Rendar COVERS THE RANGE Hz to KHz MODES - ACCEPT O from less than 1 to over REJECT 90 dB notch HI and LO PASS 12 dB per octave Lighted switches 'Minitop'miniature switches OSCILLATE Sinewave and squarewave LED indicator lights Fuse holders TYPE LF - & carriage, ins. etc Low frequency version Hz to 10KHz OMB ELECTRONICS, RIVERSIDE , EYNSFORD KENT , DA4 OAE Tel. Farningham ( Switches -toggle, slide, rocker, Prices which are CWO and ex VAT, are correct at the time of going , push - button Cable Connectors to press and are subject to change without notice. FROM OMB ELECTRONICS WW FOR FURTHER DETAILS Binding posts' Phono plugs and sockets Terminals Miniatu,re Jack plugs ' A high precision, low cost hand tool which performs three functions The Vero Systems' Combiwrap is designed to strip the insulation from 30AWG wire wrapping wire and make a'modified wrap' L

30 28 WIRELESS WORLD. JUNE /JULY puick valves. and industrial re rectvm9 EensoExporonal range Direct of supplies for OEM. private deliveN ears Wolesalers. and establishedandd INIreental users f1 Industrial please elcomted butors Send for welcomed user p O and recall uiries High quality. Overseas telex fordeta\ls and P goOd value tante. 9 Edicron Ltd.. Redan House. Redan Place. London W2 4SA Telephone 01 Tel ex: Valves Tubes Germanium and Silicon semi- conductors TV tube guns WW FOR FURTHER DETAILS People in PRODUCTION TESTING POWER UNITS Now available with the know, DEVELOPMENT 3 OUTPUTS keep in SERVICING touch. Type VRU/30/25 Call yoursecretary, factory manager, accountant or even OUTPUT 1 : 0 v, 25A DC hold a conference - all at the press of a button using the OUTPUT 2 0 v, 10A AC first easy to install % British designed and manufactured Duplex OUTPUT 3: 0 v, 4A AC Intercom System. Featuring: Operation on a 6 wire system. Plug in anywhere on the system. Retain identity station number. Up to 56 stations. Two speech channels. ALL 24 Volt supply. All from the smallest central Continuously unit available and of course the least expensive. Variable Barkway keeps you in touch Write or phone NOW for further details. Barkway Electronics Ltd., vcihu&L;o Barkway, Royston, Herts SG8 8EE, England. VALRADIO LIMITED, BROWELLS LANE, FELTHAM MIDDLESEX TW13 7EN Tel: Barkway ( 84) Barkway Telephone: / Telex: BARCOM G WW - FOR FUR I HER DETAILS WW - FOR FURTHER DETAILS manicapital.com