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1 wireless world DECEMBER 98 70p Millimetre-wave lens aerial Direct frequency synthesizer ^ ~~ / * Guide to light units

2 Autoranging r f millivoltmeter 0kHz to GHz + E E E488 interface available T rue rms or average responding Autoranging or manual LED rangs-fiidication High sensitivity Linear db scale Operates from ac mains or external dc Low power consumption Programmable iliihii WW 00 TOR FURTHER DETALS

3 WRELESS WORLD DECEMBER 98 wireless world ELECTRONCS/ TELEVSON/ RADO/ AUDO DECEMBER 98 Vol 87 No 55 Front cover shows the millimetre - wave lens aerial ofnew construction described in this issue Photo by Paul Brierley N OUR NEXT SSUE Nanocomp EPROM programmer, a device designed by Bob Coates for his microcomputer published in January and July 98 issues Clandestine radio, used for espionage during the war, helped in the development of portable hf equipment Pat Hawker tells the story Cardboard clock, a fun project for the holiday period, also suitable for demonstration purposes in schools Current issue price 70p, back issues ; ( f available! i at Retail and Trade Counter, Units & 2, Bankside ndustrial Centre, Hopton Street, London SEi Available on microfilm; please contact editor By post, current issue 6p, back issues {if available! 50, order and payments to EEP General Saies Dept, Quadrant House, The Quadrant Sutton, Surrey SM2 5AS Editorial & Advertising offices: Quad rant House, The Quadrant Sutton, Surrey SM2 5AS Telephones: Editorial Advertising TelegramaTelex: 892C84 BiSPRS G Subscription rates: year? UK and 5 outside UK Student rates: year 8 UK and fic outside UK Distribution: Quadrant House, The Quad rant, Sutton, Surrey SM2 5AS Telephone C0 Subscriptions: Ooklield House Perrymount Road, Haywards Heath, Sussex RH6 3DH Telephone Please notify a change of address USA mailing agents: Expediters of the Printed Word Ltd, 527 Madison Avenue, Suite 27, New York, NY ndclass postage paid at New York, PC Business Press Ltd 98 SSN 6062 ^ A CHARTER FOR SOLATON MLLMETRE-WAVE LENS AERALS by K L Smith THE FUNCTON OF FUNCTONS by Thomas Roddam DRECT DGTAL FREQUENCY SYNTHESZER by J H J Dawson NEWS OF THE MONTH Prize-winning computer WORLD OF AMATEUR RA00 0Y integrated circuits CURRENT MRRORS, AMPLFERS AND DUMPERS by B Wilson LETTERS TO THE EDTOR Television for no-signai areas NEW BBC/OU PRODUCTON CENTRE OPENS by Donald Aidous Unified circuit theory CRCUT DEAS Micropower voltage regulator Fusible link urom programmer MORE LGHT ON OBSCURE UNTS by J C A Chaimowicz MULTCHANNEL DGTAL TAPE RECORDER by A J Ewins DSPLACEMENT CURRENT by L A Jones NTERFACNG MCROPROCESSORS by J D Ferguson, J Stewart and P Williams HGH-RESOLUTON WEATHER SATELLTE PCTURES by M L Cbristieson EDUCATNG ENGNEERS by P Hartley NEW PRODUCTS 88 WAVES by Ariel

4 2 WRELESS WORLD DECEMBER -93 WW FOR FURTHER DETALS

5 rising Hastings WRELESS WORLD DECEMBER 98 3 ELECTRONC KTS Velleman UK present their list of electronic kits together with prices which include VAT and postage and packing They are listed in "difficulty grades", for beginners and experienced kit-builders, with the lower skill level at - to 3 All include high-quality components, full instructions and technical data and come to you packaged in clear plastic boxes, ideal for component storage REMEMBER We offer a free soldering iron with your first order over 0 Send today for the free Velleman Kit Journal Difficulty Grade: K607 22W Mini Amplifier 500 K6 7W Amplifier 54 K62 Dimmer 000W 559 K63 Dimmer 000W K76 (Deparasite) W Amplifier 032 K77 FM Oscillator 545 K803 Universal Pre-Amplifier 362 K823 A Power Supply 699 K86 Power Supply for 60W Stereo 294 K2542 Single digit counter 690 K2544 Complex Sound K2566 Generator 828 CB Power Supply 2622 K2565 Tape/ Slide Synchronizer 966 K2566 Coloured Light Unit 553 K2569 Three-tone Bell 656 K2570 Power Supply, K2572 K2573 K2575 K V DC A 656 Universal Stereo Pre-amplifier 656 Stereo RAA Corrector Amplifier 656 Microprocessor Doorbell with 26 tunes 553 Universal Start/ Stoo Timer 62 Difficulty Grade: 2 c K60 Mono VU using LED's 88 K798 Stereo VU using LED s 69 K804 60W Amplifier 55 K874 Running Light Unit 256 K2543 Transistor gnition 997 K2549 nfra-red Detection System (Transmitter) 063 K2550 nfra-red Detection K2553 System (Receiver) 242 FM Stereo Decoder 49 K2557 Digital Precision Thermometer 2657 K257 Light Computer 3623 K2574 Four-digit up/ down counter with comparator 346 K W Audio Amplifier 280 K2577 Universal AC Motor Speed Control 759 K2575 K K682 Difficulty Grade: 3 f K65 High Precision Stopwatch 433 K682 Microprocessor Universal Timer 4837 K Hz Crystal time Base 39 K2547 Four-channel nfra rod Remote Control {Transmitter) 732 K2548 Four-channel nfra-red Remote Control (Receiver) 232 K255 nfra red Central Alarm Unit 870 K2554 High-quality FM Tuner 2267 K2555 Digital Frequency K2558 Counter for Receiver 3774 FM Stereo Receiver K2559 with housing 2023 Two channel R Remote Controlled Light Dimmer K2560 (Transmitter) 732 Two channel R Remote Controlled Light Dimmer {Receiver) 3864 K2562 nfra-red Receiver for K2558 K2563 nfra-red Transmitter K2567 for K CM Display 8 K2568 K2578 (Common Anode) CM DisplaylCommon Cathode) 2 05 Microprocessor Controlled EPROM Programmer 2450 rtfrr Sokfering iron StaCC with your firs, with your first order of 0 rover VELLEMfiN UK PO Box 30 St Lconards-on-Sea, East Sussex TN37 7NL Tel : j send me your free catalogue of Velleman electronic kite: Name - Address ( WW 069 FOR FURTHER DETALS

6 l 3 a ^ ' Electronic CURRENT USED Everything as new Tektronix 432 Tekrcnu Oscilloscope mv Sensitivity Du«l Trace Pc-ta!jie) DC- 25MH* ANALOGUE VOLTMETERS AND MULTMETERS AVO fra! i Elect'oni \'jinrnri EH 5oo Marconi Tt2fcOCAC WlivOurtcwr -rt-wv mv 3QCV 7500 T"260«BccrrCW V ttl'fvcf AC 7CH7- SOH; JCCosV-KV OC?OrV i <V ANALYSERS??7PV3VC An*V*T 2»lMC«W: Gonf'Sl Radio V ia 5&>ra 3TKVW aion A-^Vicr :"A uijpocievcirfc''in - 5H -25XH; imn i< 00tUv S9» Hewlett Packard A Ciit-VT t<! Wyv--' 5i <4-6CCKHrto i «vearratff 30tyv 300 vufcs c-t 2X Ai;itfw;cf: Meter 5Hr6«KKr Ayxmr«! Mtfirf *v;n Au»»i M'8'!/ *ir!'t" Ar-rrsc* Marconi *?9?0Sp«t'um Anaivvr: 3 OH, -Cft'-? C :08?Hr'-«;!::liJ' TektronU 849! '$OKtr >T ArVyw* 0VH7 5 CGH>' SCO 00 BRDGES & COMPONENT TESTERS Avo VCM 63 V;-- i-w -JMoX r/<0 dconton Q'' flriod'j-/, <!;'- rolktanccs'ciar (J '<!nvt '/v^ifdiy 5'500kH2 Mi50X0 Marconi rfl3:3un:vb-k-:vc25'! TE745A *Tf;2'-* 0 (ric!r TVS 520 See of toemacrs FULL GUARANTEE At Electronic Brokers we give you a TWELVE -- MONTHS WARRANTY on test equipment and 90 DAYS ON MOST COMPUTER PERPHERALS And we ll stand behind it all the way CALBRATON EQUPMENT Bradley :9>Or<nw«K^ CaicuK! Fluke 332A ix yoiagsolower yro : r! r-av 0 lporfirt'olucis' Q0fit *tr curacy Tektfonfx (9 Constat Ar^0u!RGentf3tff3M*H-'- loomfc : FREQUENCY COUNTERS Marconi Tf2*»W*se:«nrt«jr 70yS!CH?0QM>-s /hvvw-viv 75 0= -i-mi- *msu«tty lwt W&& DVM's AND DMM s Hewlett Packard A - /474CA4 Ltg<rX'-*( vicwv? 9500 H7S0A A 5 iwj«dcv-c VCltS^O P j v Ogi OMM *xoc vofe «; >ra<xc <uv ieiuiuw'i 30«ayv/**i*n y PM b * OMM: AC'DC-vos-v «* #"V) reaivlvtffi C;<Vr! nlyi:y Tli»S?M PM254jv, d?,n AuKrang*^ AC>DC vdrs Luacmro fivmki 9500 Solertron A243SV: Jigr-JMM AC:x «* fwaunco ifi -'v wc-ianr' 'ik5 M&Qfrtit&yx (JMM SW* vfngtn! jaow ac : >*v *-c rfiowpe^ ; 0-5 ucis prowivamud» ft*; KS23? TOWKfttCfBW irttcrtatn ; isio-coo AC tiv«- '«ataocc 695oo 7C6S stuibiirnto iv',rj and SS232 $«* «M*5,00 MULTMETERS Avo irv it Monger 20KCi/mx *> miv 7500 AVOSA'SC^vCtt: **? «* ru»l?3!«it **-«5 iy# SOSeHOeM yckivo' 7700 OSCLLOSCOPES Hewlett Packard fi'c - W5A - 835A iocmwoua' l:»:e : «OK -c 52 4 :A TE»fetOpHl ramtxcrrt Marconi 7F72 T K22 4 'X-yt>Vn Y a- - ovmcrv SE La3i 5A*2 ACtaMSwRaor'Or!' ft ksciiv w-wp 500 reklronlx 4t5 Dual Trace ftrttbv C-yMyc:/* i yj'h/ «r»'v-5v '(tfa t licht/ei S'vecp ki'i* frhv OCaDJ y- -,r OndOiC0(< ipk «" >!T > ' -:io;i«co 30CVU S 7875cc 4< Jt* CorTTWe Jrcp? *3-: wiir 5A 'EM 2M--<? Du*: r iiic-ei SMrVMHt Swe?pp!u;m a-p--g m 5847(5ejy POA 7*03 flw*ntrartf COpiptte ** 7Af N' SW?B55NDcty sveep i "w i:? 00 7C4A V V- vi * CW 7A (335 '&» :r,r, />MHr lordwifw' LV- - at - 3C0VJ ft reletjulpment 063 Du- fjnotv!9i OyOCO«v G!' v- VA-lurv 4 TriC'; 'OC-'WWJ 5PiV'73tfTjv OM64 WH' Ok:(bkt» 0-t! rare «V»«X<» W?::e d!t«c Ot 750 9V7S b?5 DuJ'~r«tt BwWtte Osorcsecor- Nfw (38? 5'i(V'SCi;!<B'rty OC - KUWCUV S OSCLLOSCOPE PROBES cc - mum f9oo POWER SUPPLES Advance MGS-M3 SV» «JA yy«m05-m5v -S*> 20A yv-ch>x, Vfv 5V ; (M 'w : MG V? 2AjvviKftftg Weir, 423DTt>'OvU-e, 3A exit^yt^atxfla RECORDERS Racal seiaoi 5C: SOC'iaimsi W k<o<<c' i7vc i,ixo 5 infirilsec U -papst 5 GOOD REASONS WHY YOU SHOULD DEAL WTH ELECTRONC BROKERS FAST DELVERY W'hen you buy m used equipment from Electronic Brokers, it can be yours in a matter ol only days No waiting for manufacturers lengthy production schedules LOWEST PRCES As the leading Second User Equipment company n Europe, we are able to buy in bulk selecting only the very best equipment This means we can sell to you at the lowest possible prices SUPERBLY MANTANED EQUPMENT When you buy from Electronic - Brokers you know the equipment is in top notch' condition t is refurbished incur own service laboratories and checked to meet the manufacturer's sales specifications POH5 PO-A SCO El 3000 E STATE-OF- TH E-ART- TECH- NOLOGY At Electronic 4-*- Brokers, we carry large stocks of modern test and computer equipment, and our strong buying power means we are able lo purchase the very latest stale-of-the art technology

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9 i GW0C-5C0-7cm 6 ' P m: Hameg HM 203 PORTABLE OSCLLOSCOPE (LLUSTRATED) hare UCro 20MHz Ex '0cm display W nc 5r$ St'Oilivily 5rrlV/cm-?0WCm Tmirt - - ') X*» t'vr-tifvvx YopeiaUsn \ii:»» -»fc'c " jjci Channel Chaiwl 2 C, tj> miac flf TViOWpes vvi filp) 6<q Sue <"vrrs H 45W 23 D 38C Europe s standard service scope Unbeatable value at HM 307 OSCLLOSCOPE % : f* r:,v» X?0 Oft/' / vciimr 3 0 yjtjitr-'l 25 HM OSCLLOSCOPE fii'rt-f' Still at only 3800 x Cem rcctangulai - Risfttt"* i SrS jmebase 05uSO2S Z -odulmian Auto rr Channel orz i; delay Variable HM 52-8 OSCLLOSCOPE Durii trace DC- 5 C\ Risetvoe 7nS 5mVlcmi< ar-7s rm X5 magnify, ion Sweep delay and ; wac ng edge ilc E 58000,iva awe w*n P7 long :: M 307 p* ct'scn The above prices do not nclude carriage or VAT ( 5% Please send for Technical Literature Fluke - BRAND NEW JUST RELEASED NOW 2 YEAR WARRANTY * Fluke 8022B (llustrated) 3/ Digit hand held LCD DMM AC/DC vo«s DO AC current resistance, code test 025% basic DC accuracy Overload protection Vinyl carrying case COO 80) * Fluke 802 B Same spec as 0223 with additional audio tore for continuity, Vtay! casec Fluke 8020B 3V digit 0 % banc DC accuracy CO'AC volts DC AC current, resistance, diode test and conductance Continuity beeper Vinyl case C90 < Fluke 8024B 3 Vi digit 0) % basic DC accuracy DC/AC volts DC'AC current, resistance Diode test, conductance, logic - continuity detect - temperature Peak nod or vetageand current functions, continuity beeper Vanvl case CSO ' FLUKE 8050A Yt Dig! LCD DMM with hue SMS or- AC volts a nd currcr : DC vitt s 200- V-KV KfcV resolution AC volts 200" -V 750V GuV reso'ulion DC'AC current 20CuA-2A 0 OlpA resolution resistance 20G0-20MA CC f! resolution Also reads db direct referenced to stored impedances Ccic-jcance ranges 2mS and 203ns 245 ains mode) 285 mains battery FLUKE 80 2A 3 Vi Dio : LCD DVV with :-uc RMS on AC volts and current DC volts 200mV-lKV locpv resolution AC vots20qmv-750v iocgv resohition DC AC Current 20CVA-2A C!(/A resolution Resistance CW9 Olfi resputio'i Low resistance 2f! and 20tt mf} rcso Jtion Conductance ranges ZinWOwWOOnS mainsmodel mans battery FLUKE 80 OA 3Vi Digir -CD DMV Same spec asso 2A p us a C Arm; ag'dc current range, but net low resistance targe 6700 mains model 9300 ma ns battery Also avai'abfc a range of accessories including cm rent tfijrjts El t p'ct>e rf p dbr Temperature probe and rouen and nod p-obe Fu detailscn request The above prices do not nclude carriage or [ [VAT ( 5%) Please send for Technical Literature CE 680G MULTMETER (LLUSTRATED) 48 RANGES DC voffs ; XlmV-? (XX)VAC vcits 2 0 5C 250 GCO 25COV DC current: S05CQuA irtA-5A AC Current 25CVA mA-2SA Resistance fix Mix 70-SJ x roo-rx 0C0 end Low-5, 'u range '!) icmilupto OQMO can do measured uvng ext AC suppy dosce'e-loto - 2 2c OdE'= V/ ire 6003 Sens * v :/ DC 20KQ/V AC KitV Accuracy 2 0% AC and DC a:ccry EvcreanyNo 8 Overload capability icxc i o-' resistance ranges Protected by internal SfiFuse 5-7p w,incase k; fix * i x Meter sve ;ocm Supplied with -ads and carrying case R HGH ACCURACY MULTMETER 80 RANGES : DC volts OOrrV-2- i OOOV AC volts 2 0-SO2S0KXO-2500VDC current; W-50CVA mA*5A AC current: 25(VA-2:5-25-2SC*mA-2AA X7 yvr'fh on ai votage and currem ranges excep: 2500V AC setting Resstanre it x i-ilx 0-Ox UX>Cx :c<x> ai'dl'owfi 'ul range isl-cmst uptc COMO can dp measured uvnq ext AC supply db see 0 to + 22-JB OdE = imw into 6C08 Senvnvay DC /QKMV AC 4KW Accuracy DC % AC 2% Battery Eveready Na i Overload capac ity COO w : i or' resistance rartaes Protected by ntcrnal 3U fuse Size with case 37 x 0 4x 5 4cm Merer - 7cm Supplied Will; leads and Canyincl case 3200 MCROTEST 80 POCKET SZED MULTMETER 40 RANGES DC volts OOnV-Z- C-50-20C- OOOV AC volts i S-:0oG-?s0-i0L0v DC current: W-SOCkiA ^ r>0-3ocma-5a AC suiter-:: 2^ A-2 V25V50mA-2 SA ResrStaiXP!i x Cf! x CO and low it full ranee it x l in-swodbsca'e (Oto»22dBCdB- mw -:o tcqp ScrsinviPy: DC 2CKP/V AC 4Kfi-V Accuracy /% AC and DC Gatteiy M--Ho-y RM 625NO\'crl03dcapaDiiay 000: r>n resis:ance ranges P'crertedby intern- tti 'use Size wit': Mete' s«c 3 Scm Sjpp' nd case 53 x 96 x 23cm with leads and carrying case 660 Please add 50 carriage per meter plu» 5% VAT on total meter and carriage price Send for Literature Electronic Brokers Limited 6/65 Kings Cross Road London WCX 9LN England Telephone: Telex: Elebro G Hours ol Business: 9am 5pm Mon-Fri Closed lunch -2pm ADD 5% VAT TO ALL PRCES Carriage and Packing charge extra on all tems unless otherwise staled A copy of our Trading Conditions is available on request HM Z

10 S 8 WRELESS WORLD DECEMBER 98 lactinor FM/AM 000s with Spectrum Analyser we call it the SUPER A portable communications service monitor from FR light enough to carry anywhere and good enough for most two-way radio system tests The FM/AM 000s can do the work of a spectrum analyser, oscilloscope, tone generator, deviation meter, modulation meter, signal generator, wattmeter, voltmeter, frequency error meter and up to five service engineers who could be doing something else! A PRACTCAL TOP UP! MM-00 MULT METER Simply replaces the protective lid of the FM/AM 000s t includes a modified probe PB- 4 and a built in speaker unit with independent volume control for audible response to signal measurement This practical 'top up' will perform the following functions Sinad: Measurements for khz tone (+20 Hz) Distortion: To 30% DC Volts: Up to 300 volts and up to 800 volts when the X0 probe is used AC Volts: 600 VRMS maximum for frequencies between 25 Hz and 25 khz Ohms: Usmg the modified probe, part number PB- 4, Ohms can be measured on scales X to X0 K % AM Measured on the RF signal applied to the FM/AM-000 unit OPTONAL ACCESSORES A choice of RF power attenuators and protective carrying cases HLOMAST SYSTEMS f PNEUMATC TELESCOPC MASTS For further information contact Mike Taylor Fieldtech Heathrow FR precision simulators WW FOR FURTHER DETALS Fieldtech Heathrow Ltd Hvntavla House 420 Bath Roac West Drayton Middlesex UB7 DLL Tel Te«x: FLD ECG HLOMAST LMTED THESTREEF HEYBRDGE - MALDON ESSEX CM9 7NB ENGLAND Tel MALDON (062) TELEX NO WAV' FOR FURTHER DETALS

11 Paw *7 Second User Test Equipment, Calibrated to Manufacturer's original specification ACOUSTC E* VBRATON BRUEL& KJAER Prices hornc Prices front 4CO 2233 Sou nc -rvfl Meter 450 MANS TEST EQUPMENT 603 Bie table Storage Vcmtor XVZ amr-o 7335 la--ni 360 COLE T92 0 MH*2mV2Tr -TS2>3cr-ir-: <230 Sound aval Calibrate- 96 T C07 Volt f -eg / Spi<e Vonitor Oac O/P NWie DaicTctcr 375 DATALAB POWER MEASUREMENT BRDGES» V and STANDARDS DL09 Main nterlace *c- L'LSOb 300 HEWLETT D ACKARD GENERAL RESSTANCE DRANETZ ftwla ype h Cce> sensor 'or 436A DAS56DC Vane icalbluv :GV3DmA SCO QX, 3in vo» Av/Sbi a Time/ Pm:e< 2950 MARCON HEWLETT PACKARD GAY TF252 DC -600 MHz Pow«m,i*f 475A Djiu Auiom,iic LCR 3rHi;9 975 LDM AC DC/ Spke Time ir; P-inte' 250 T-8S3A l0hz-20khz Pcrwer-rele-- 43«2 QLC Mete 22 KHz-70 MHz 400 MSCELLANEOUS POWER SUPPLES etc MARCON AVO ADVANCE TFS68A UnVtfMl LCR Bridgn 250 BM26AC-DC Breakdown- Leakage lesior 475 V5S inverter 24V DC»240V AC 53BVV WAYNE KERR COMARK FARNELL B52' LCR Bridge 6 6C8S Thermom tocl-87 - CWCtypeK 50 FFSL5V - 20 A P5U module COMMS& CABLE TEST /«' 3 T'^rmecooptcs not q closed tsoa 0-30V variable la Metered EQUPMENT DATALAB FLUKE CHASE DL83 n giu S* Field Slraiyytl Malar MHz 800 HEWLETT PACKARD HEWLETT PACKARD HEWLETT PACKARD XJ37A Rotan, vane All, (veto- WG A0-36 Vaarisbfct OA matered 3556A ua&phom-t-r 20 Hz-20 <Hz 260 MULTMETRCS PHLPS 7r,nuamfieooide«500 45B0-3 KV variabo 30n-A Matures TEKTRONX AF 20 D J8l H L ' Pe» 52 TOR Cable Teeter Cft~ Heeernc filter 20 Hz 2 vhj 600 PULSE GENERATORS COMPUTER EQUPMENT RESEARCH NSTRUMENTS CENTRONCS Micro man'-publor 4 Probes moveable n 70? matrix printer all 600 plar«aaiussabto test tab'e Watson TEKTRONX Burn*!00 Complete system mounted Hs'i! copy prhter or 400 series ccmp-jter disgby terminals COUNTERS & TMERS FLUKE 90A 25MHz agit Cmr AC-Ratt MHz 7 Digit Counter 92A0 As 3 2A but -ic re cnatqirg Oaitanos 92>A5M Vhz 3 Dig* Counte* ire Brat rode 5 970A4 2M MHr otherwise** S20A 7 HEWLETT PACKARD 63CCA 6 Display Jnit D n tegc 5305B 300 MHz Counter for RACAL $ VHr 7 V, digit Counter 2 «<25 GHz9digit Counter 4 &9052C*3M j8cjilcoonter -mcr 3 SYSTRON DONNER 6C633GHj5di;}: Counter 8CO O/P 7 503B Strip Pfnt-r g- 6063/ DGTAL TESTNG EQUPMENT HEWLETT PACKARD 60 r Logic t'oublesh noting W 6COS Logs Analyser 37ch 70 VHr 27 TEKTRONX 7D0F logc Airayser SchEOMHz PSin 832 Daacorrx o-t V24 RS73? con THS MONTH'S SPECAL OFFERS FLUKE 892 A Crg a ana cmicgue true 8MS AC vcumoter cad pawn- meter Froquer jy tang? 0 Hr -50 MHj Socooui - 3 dig* LEO airplay one oncicgue mere to* c^pk ond iu> odlusimnti Ranges- 2mv fsd to 7MV f so plus OBm forges fee: -g ponf Oetkereo to 2 sic nflc'c inpu mc&acnces Pen 505/ to i?oco Aisoreicrve db mode 'Of totness/dittcfeiice nocstiferretils Wll mecscfe AC0o>v$f/Volts i preseraeol CC ops" -«v-onolle or monuol tong ng 825 ML ENGNEERNG - NANO AMMETER/ MCRO VOLTMETER S Ancicgue Motet v*lth c«- ;e'o see? lufo-rcrpes'/om WOrA to 304 SO 7 Vonoge Rorjesf'cm TOO-V -o 30V F50 Con be used in cocvewtonal mode of oso sensr-ra null m»et deso :ivrunonts ate new 45 ONE YEAR GUARANTEE CONTACT US FORA CASH QUT! ON YOlXLHDCft ununo list foupwfht ir perspex enclosure TEKTRONX 52PAL VoctD-scopn 578 TV Wavfi'orm Monitor 575 Sen- cot-ductor Curve tracer ' 48C TV Wavnfnrm Monitor pal NTSC NETWORK ANALYSERS/ PHASEMETERS DRANET 'KO Phasemeter 2Hr 7-MKHj HEWLETT PACKARD 5435A vector Voimeter -000 M Hr B44A Polar Display tor 840 NWA OSCLLOSCOPES & ACCESSORES GOULD ADVANCE OS330C3 60 VMz mv2 "race 2T base HEWLETT PACKARD 934A50 MHz20mV4 racepbg in ia?5a rival TrtHi&aee W/g-in 935A 0 MHz 5mV2 Trace r-*,gm PHLPS act'/ PE V aariabteba Metered V - PV32 5 MHj 2mV 7 Trace TV tt-g PV MHj 2-rV 2 Trace TV tr g PM32U 53 MMz b-rv 4 race 2 case PM37S3 70 MH/ SmV 7 Trace 7- twee PM MMr5m V 2 Trace 2T base r View 50 TEKTRONX 465 '03 VHr 5mV 2 Trace 2T base 465S 30 MHz 5mV 2 race 2TB ire Probet ^203 VHj2mV2 TtAJATTbase S3S0 VHr 5mV2 Tract, 2T base 2300 S/4S3'6TA GHz Samntirg scope 775 /A 2 C6MHj 6mV 2 Trace Plug-n 300 7A 6 75 MHz SmV 2 T-ace Plug-in *20 7A9600MMz icmv t Trace Plug n 990 7A22 MHj 0jV Qifle-enMi Plug-in 596 7A MHz 5nV 2 T -acc Plug in 990 /A?6 2CO MHj SmV 7 7<ace Plug-in 655 7P53A?Trnel>ase PkiB-ir WOMHzTrig Sirglo Thrcbase 403 Vl-z rg tcoasc win 0*0, 400MHJ Trig 'DOMHj CRTr'Oot 3»0t V Frame A 200 MHz CAT r out 4 sot V f rame 450 P6C'3A *000 2KV P<obfl 95 TELEQUPMENT 063 V V 5 MHz 2 Trace mv V* S2A 60 MHz rrv 2 Trace O' Sg CRi MHz5mv2 Trace TV rig 295 VUDA~A PS935/ MrlrbmV2 Trace unit Has built in 3 i C git DM V 3 i eg enter 675 f/ore: MOa/ange of cantewt P-0 A OSCLLOSCOPES (STORAGE) HEWLETT PACKARD r?coa 25M* j lomv 2 (2TB toccoiv ms 400 TEKTRONX 466 loomhz6mv2 Tr2'B l3to:m -s 2950 Prices from C ADVANCE PG570HZ 50V<z -CVSCnVariRTSes EH RESEARCH 32 0 Hr-35VHr 50V SOU RT 0ns7e»o MARCON TP2025O2 Hz-25 MHz tovsosl RT7r«2 scse RECORDERS Er ACCESSORES BRUNO WOELKE MEQ2B Wow aul Butt*' meter BRYANS SOUTHERN BS36Cnir: 0 6 Per idspeec HEWLETT PACKARD 705A XV pen 44 S i,a 7WOA XV2 c*na3 size PHLPS ^M9H XV pen A4**e PM825 Chart 3' pen 2 tpeeo SE LABS $64 6 c i ga vo arnamp - OC srdpe at/uply 450 V fl\n 8 ' 26 ch 6 speco 0CO 650/5 l/v leccrfflor '7 ch-mc fi champs SMTHS RE64 Chart 9" cen8 soccd RE50M70 Chi 4" - XV ch 0 wd AC Ball SOLARTRON 3740 Mnd-iiar Data 09S* syetem POA Note: 0 ' recottivs are poccoten pao/os SGNAL ANALYSS EQUPMENT MARCON TF23WA Mod Meter MHz-iGHzAV rm 450 Tf 2530Wave Analyser 2C Hz 0 < Hz 900 Nose: see alio '"Spectrum Ana/vie/s" SGNAL FUNCTON + SWEEP GENEFLATORS ADVANCE SG630 Gerera to MHzAM'FV 200 GENERAL RADO 382 Gerewor 72C-920 MHj 375 HEWLETT PACKARD 8S40B Generator 6<X XHz-5'2 MHj AV hv nasoloc* B Generator3 8-75OH/ Generator MHj Generator 08 2 GHz 825 MARCON TF44H-4S Generator 0 KH/-72 VHr AM 660 T r 83lO Gere'alo* 0 MHz 4?o MHj AM 80 T^tTiF; 7 Genera tot : M Hr iv FV 670 TF0663 Generator MHz AM FM 690 T 232 Gereiato MHj hv 550 l?35gororator tc 523 MHj AM-FV 50 PHLPS PMS 77 Function0 Hz- MHz Sir S< Trl Bmp 450 PM529 Fur'dicn mhz Ml* j S t Sg Tii/RamD'PuBe - Sweep - Bunt 545 TEXSCAN 3900 Sweeper M'lz 6/ ir C«' a-s= 525 VS60 3 wee tier 6 0CO MHj 690 SPECTRUM ANALYSERS HEWLETT PACKARD 4T /86S2B'85S*A Cp-np'ete 0-8 GHz 3660A 5 Hz-50 KHr with dgl itpre drsp &S46A re-seectoroombghz - 6S56B0 '600 VHr Plug n lor &D senes MARCON TF237C 30 Hz- 0MH* Dg-8&-e d-apuy Du t- n c&ir ter ard trac' rj pen VOLT/MULT-METER (ANALOGUE) AVO 8 V4AC/DC/-V!> BOONTON 92C AC/Bf lokhz 2 GHZ VimV-3V HEWLETT PACKARD 4<XF OHj-OMHj lmv-30cv DC OfP 40H 0 Hz-4 MHz lmv-3cov 4 A MHz l3rv SV DC C/P 427AG/OC/V/U 3400 TRMS 0 ra 0 MHzmV-300V DC-0 7 P MARCON T F <!' z 5GHz 3KUV-3V TF2&> 20 Hz-i 5 GHr 30CmV-300V PHLPS - PM24S4B 0 Hz-2 MHz inv-kov DCC RACAL 333 BMS 0 KHz- 50Hz COV 33CV VBRON/EL mv-lveiedrometer VOLT/MULT-METER (DGTAU BOONTON 92AD l993rsd 0 KHz- 2 GHr 0aV res FLUKE 930A7O3 FSD TRMS AC/DC'VU 830A0 As 80 Or" - to- charging batters 8073A 7000 FSD Handheld AC/DC/Vfl - co-id 8322A2033 hsd Handhole AC DC/VO 8333A-i;W3FSDAC-, DCA'U8*tt i AC 8353A20WC FSOAC/OC/Vfl db TBMS 3833A2COOOC FSD ACOC-'VQ GOULD DVM7 999 PSD AC/OC/V//U HEWLETT PACKARD 349QA V»OOCrSD AC/DC/V/D SOLARTRON A70 999FSO DC only pv-l XV A FSD AC/OC/V/D A? FSO TBMS AC/ DC 'V/fl * NEWS # WE ARE NOW DSTRBUTORS FOR THE CfOtech RANGE OF LOW COST HGH PERFORMANCE OSCLLOSCOPES Th«ra-gt ol si* diflzrcnl models ir-tlucm sn;if frd dual luce ircdti w-ih taodwidths ol 0 S and» MHt There ate two sstte-y cewere-d scopes in lh«range, wlh oplid'jl mains pcweiec baitety e - '-eiofichatget Tmea models n<8 built-in compcoeii tcstcfi vaich give on Kteon indicatic- - o' correct comcc-ia- lunciion * WRTE OR PHOR TOR OUR CROUCH BROCHURE WHCH CORTRRS TECHNCAl DTAS ANO PRCES Of THE COUPLET* RADGE f/*v XCS Mat 383 SitglauMi SMHrSmV twwintf wit lullicsrplrmt 45 MH3337 Oji uace! MWSnV ieue-mtr win tifii dtu PLUS 4 OTHER VOC/eiSAT ineerwten prices THESE NSTRUMENTS ARE BRAND NEW ANO ARE AVAlABtE ffiom STOCK Poets poo>e TOO 625 Carston Electronics Ltd Shirley House, 27 Camden Road London NW 9NR Telex: Full details and specification of equlpmenf listed, available Because of long copy dates this list s nof comprehensive - ring for nventory update or tell us your SPECFC NEEDS Hours Monday to Friday 900 am-530 pm (430 pm Fridays) Prices exclude delivery and VAT VJe take Access or Barclaycard ww for further details

12 K ConPC ' 0 WRELESS WORLD DECEMBER 98 Hehru's COMPUTER KT DVSON TANGERNE SYSTEMS R / LONDON & HOME COUNTES STOCKSTS RETAL SALES AND DEMONSTRATONS 404 EDGWARE RD LONDON, W2 ED TEL: TANGERNE* TANGERNE ^TANGERNE 'TANGERNE TANGERNE MCROTAN 65 MiitoUr 6$ is Om most td, anted ptwtrtul upantablf micro *v»it6 p ii dio Hopteot!o u ran must coil MCRCTAN 5 CONTENTS K'jh to&n dialed ru h:ie w*:r : me 'u C jolder rcsisi ant s :» scumr) tutrpu-pnl if tnlilii Jlioo 8S07 r-o ;pnjc*!«c < mo- AN8L J K:w ait t V 3q l< RAV p 4, royi-ntit rail an: 0'*; *, VOU t p'jnu-fic dur- not fun r 3? chatatua MlCRO'AK 65 system Me t-ndr- l3fi ;>q> bejntf uieitltattfwaie/ soliwji* «(mil (ill- imst-uaioeil OlUili *M sirplp jicqtir met ln?c*m d «i-ip ronpmcmslo lull uiint MCROTAN 63 T-? 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13 WRELESS WORLD DECEMBER 98 NEWFROM THE ONE-OFFSHOP 2/24 LCD CLOCK MODULE Features a 05" LCD Display, user selectable 2 or 24 hour operation, dual time, alarm, 24 minute stop watch, sleep and timer control functions The display shows A, P and alarm annunciations An incandescent lamp back bulb is also fitted t is supplied complete with bezel at 395 "one off" and 325 for 0+ HEATSNKS An extensive range of heat sinks manufactured by Redpoint is now available in the new Verospeed catalogue at competitive one off" prices plus discounts The range covers every type of popular semiconductor package including T05, T03 T0220 T026, TV500, T08 and a special sink for dual-inline devices up to 6 pin which does not require adhesive All types are black anodised DODES Diodes complement the already extensive range of semiconducting devices supplied by Verospeed Manufactured by Diodes nc the comprehensive range includes N4000 and N5400 series amp and 3 amp fast recovery diodes, A, 2A, 3A, 6A, 5A, and 35A silicone bridge rectifiers All types have an extremely high reputation for reliability and are very competitively priced both for small quantities and for the published discount catalogue prices Look for these - and lots more in THE ONE-OFF SHOP Send for your copy Test our service by phoning before 300 pm - and your catalogue v/ill be in the post tonight Britain's fastest growing distributor of branded electronic components Verospeed Stansted Road, Boyatt Wood Eastleigh Hants SOS 4ZY Telex WW FOR FURTHER DETALS ONLY 4850 PoKfrerinc VAT Lorn METER PROBLEMS? HOLDS UP TO SX EPROMS SAFETY NTERLOCKED TRAY FAST ERASE TME UALTY STEEL CASE - M ONEY-BACK GUARANTEE NORTHERN ELECTRONCS Sen chccx -ir llicirl nrit! P! Jdrvsrv TdCpn«ic>:iJcrv will i\- Jojwchcd COJ j: r' cmtj choree Also available in LcnJgn liver Teclmomatic l-td Trjnj-im and ir Aberdeen from Granite Chin 5 Arundel Street, Mowlcy, Lancashire Tel: Mo*dey(W575) ^ 9 WW FOR FURTHER DETALS Britain snoi magazine for the radio enthusiast From the June issue Practical Wireless becomes an "all radio" magazine, covering all the techniques and applications of radio, including licensed amateur radio, short-wave listening, DX (long-distance) broadcast listening and viewing, radio control, etc, plus the latest developments on the CB scene metical Full 37 Standard Ranges in a variety of sizes and stylings available for 0-4 days delivery Other Ranges and special scales can be made to order nformation from: HARRS ELECTRONCS (London) 38 GRAYS NN ROAD, WC Phono: 0/837/7937 Telex: HARTRO G WW FOR FURTHER DETALS

14 2 WRELESS WORLD DECEMBER 98 Sinclair ZX8 Personal Com the heart of a system that grows with you 980 saw a genuine breakthrough - the Sinclair ZX80 world's first complete personal computer for under 00 Not surprisingly, over were sold n March 98, the Sinclair lead increased dramatically For just 6995 the Sinclair ZX8 offers even more advanced facilities at an even lower price nitially, even we were surprised by the demand - over 50,000 in the first 3 months! Today, the Sinclair ZX8 is the heart of a computer system You can add 6-times more memory with the ZX RAM pack TheZX Printer offers an unbeatable combination of performance and price And the ZX Software library is growing every day Lower price: higher capability With the ZX8, it's still very simple to teach yourself computing, but the ZX8 packs even greater working capability than the ZX80 t uses the same micro-processor, but incorporates a new, more powerful 8K BASC ROM - the 'trained intelligence of the computer This chip works in decimals, handles logs and trig, allows you to plot graphs, and builds up animated displays And!heZX8l incorporates other operation refinements - the facility to load and save named programs on cassette, for example, and to drive the new ZX Printer New BASC manual hvery 2Xci cone-, wilh a ec up'e'ensive speedily- w niter manual - 8 complete course in SAStC D»OfifiHnninp<roni iirii principles to complex programs Kit: 49^ Higher specification, lower price - how s it done? Quite simply, by design The ZX80 reduced the chips in a working computer from 40 or so to 2 The ZX8 reduces the 2 to 4! The secret lies in a totally new master chip Designed by Sinclair and custom-built in Britain, this unique chip replaces 8 chips from thezx80! New, improved specification Z80A micro-processor - new faster version of the famous Z80 chip, widely recognised as the best ever made Unique one-touch keyword entry: the ZX8 eliminates a great deal of tiresome typing Key words (RUN, LST, PRNT, etc) have their own single-key entry Unique syntax-check and report codes identify programming errors immediately Full range of mathematical and scientific functions accurate to eight decimal places Graph-drawing and animateddisplay facilities Multi-dimensional string and numerical arrays Up to 26 FOR/NEXT loops Randomise function - useful for games as well as serious applications Cassette LOAD and SAVE with named programs ik-byte RAM expandable to 6K bytes with Sinclair RAM pack Able to drive the new Sinclair printer Advanced 4-chip design: microprocessor, ROM, RAM, plus master chip - unique, custom-built chip replacing 8 ZX80 chips Built: B9 95 Kit or built - t s up to you! You'll be surprised how easy the ZX8 kit is to build: just four chips to assemble (plus, of course the other discrete components) - a few hours' work with a fine-tipped soldering iron And you may already have a suitable mains adaptor ma at 9 V DC nominal unregulated (supplied with built version) Kit and built versions come complete with all leads to connect to your TV (colour or black and white) and cassette recorder

15 WRELESS WORLD DECEMBER T93 3 iter- 6K-byte RAM pack for massive add-on memory Designed as a complete module to fit your Sinclair ZX80 orzx8 the RAW oack simply plugs into the existing expansion port at the rear of the computer to multiply your data/program storage by 6! Use it for long and complex programs or as a personal database Yet it costs as little as half the price of competitive additional memory With the RAM pack, you can also run some of the more sophisticated ZX Software - the Business & Household management systems for example for only 49- Designed exclusively for use with the ZX8 (and ZX80 with 8K BASC ROM), the printer offers full alphanumerics and highly sophisticated graphics A special feature is COPY, which prints out exactly what is on the whole TV screen without the need for further intructions At last you can have a hard copy of your program listings - particularly How to order your ZX8 BY PHONE - Access, Barclaycard or Trustcard holders can call for personal attention 24 hours a day, every day BY FREEPOST - use the no-stampneeded coupon below You can pay nto: Sinclair Research Ltd FREEPOST 7, Cambridge, CB2 YY useful when writing or editing programs And of course you can print out your results for permanent records or sending to a friend Printing speed is 50 characters per second, with 32 characters per line and 9 lines per vertical inch The ZX Printer connects to the rear of your computer - using a stackable connector so you can plug in a RAM pack as well A roll of paper (65 ft long x 4 in wide) is supplied, along with full instructions by cheque, postal order, Access, Barclaycard or Trustcard ETHER WAY - please allow up to 28 days for delivery And there s a 4-day money-back option We want you to be satisfied beyond doubt - and we have no doubt that you will be Qty tem Code tem price Sinclair 7X8 Personal Computer ki:;s) s 'ice includes 7X6 BASC manual, excludes "sins adaptor fieady-assem'oleci Sinclair ZX3 ferscnai Computers) Price i nci udes ZX8 BASC - ars ualand mai ns acaplc r 6995 Mains Adaptor's; :630 ma al 9 V DC nominal unregula:ed) K-9VTE RAM pac«4995 8< BASC ROM to fit ZX80 5 Order! Total Pcs: and Packing 295 _ Please lick if you require a VAT receipl TOTAL ' enclose a cheque/ costal order payable to Sinclair Research Ltd for Please charge to my Access'Barclaycard'TruS ca'd account no Plena# Uoeit/uumpteie as aeoi'ce&ie Please punt \ame: Mr/Mrs/Miss Address: i -X- - i 6 Kings Parade, Cambridge, Cambs, CB2 SN Tel: (0276) 6604 & 2282 ^FREEPOST - no stamp needed Offer applies to UK only wrw 2 WW 052 FOR KUR HER DETALS

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