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& Wireless World THE R ALR PR FEINAL E I EER ELECTRON., :3 & WIRELESS WORLD SEPTEMBER 1988 £1.95 World standard for h.d.tv? IEEE 488 interface for Z80 -based computers P.l.ds and logic probes Flywheel step- upswitching regulator design Alec Reeves and pulse -code modulation Dimensional approach to unified theory Denmark DKr. 63.00 Germany DM 12.10 Greece Dn. 680 Holland DEL 12.50 Italy L 6500 IR 62 86 Main Phis. 700.00 Singapore SS 11.21' Switzerland SFr. 8.50 USA 55.95 The Gould 1604 Digita orage sci oscope Give it a screen test The Gould 1604 digital storage oscilloscope has the memory and performance to tackle any role in low frequency electronics, mechanical or physiological R&D and test enviror ments. I ' With massive 10K word 10101 ,, memories on each of its 4 4. channels the 1604 can examine qt detail with expalsion factors up to 200 times, and resolution down to 5Ons. And it can do so much more. The 1604 has a built-in colour osciu,og_oPE plotter for instart print-outs of displayed traces, and the ability 1604-DicitrALOta to archive up to 50 traces in the MODEL Good) non-volatile memory pods. For 1K tAMoo even more capability, interface "(I WORD the fully programmable 1604 to 10K a a computer; or plug in the NEL CRANK waveform processor. atEN cN010{ FAA, The 1604 DSO has a wide range oN of automatic functions at an opozAn unbeatable price, and it's so easy to drive! Why not let it audition for you? IscAPPlesiL For further details of the 1604 or 0')DMs15 Atqfri,15 the 2 -channel 1602, contact: PAfiA 01-500 1000. AN Gould Electronics Limited oAN Test & Measurement Sales Division ieteke Roebuck Road, Hainault. Ilford, Essex IG6 3UE PRo02004H Po --L9 ikorreg Tel: 01 500-1000 Telex 263785 0 coLourz 0IIVrT-1,, goompilmorip- CAL , VMS. Va. bin TIVEIDIV JillILL/ vi T. 474 . OltAlg "C""7 LDc:j Immo. 441 O 102 uoutu I sc.. 13S 423 Int,. Available for rental from Livingston Hire MULE I 11 ItI UN 1{1:1.1.1 Electronic. SEPTEMBER 1988 VOLUME 94 NUMBER 1631 Loran brought up to date: a new nationwide radio position -finding system is described on page 897. KEYBOARD DESIGN 910 Details that designers sometimes overlook Jeff Wright ANALOGUE CIRCUITS FOR COVER AUTOMOTIVE USES High -definition television will bring to domestic viewers pictures sharper even 915 than those they can see in the cinema Spike -resistant chips for cars (off -screen photographs by courtesy of Sony Rocco Shah Broadcast). A DIMENSIONAL APPROACH PAN -EUROPEAN CELLULAR EUREKA 95 -A WORLD TO UNIFIED THEORY DEMONSTRATION STANDARD 882 919 845 Dimensional relationships of common Digital radiotelephone success European promoters of high -definition physical concepts television prepare for a crucial S.K. Chatterjee demonstration BROADBAND Tom lvall INSTRUMENTATION PHILIP SMITH'S CHART -2 AMPLIFIER IEEE488-TO-Z80 INTERFACE 887 937 852 JW supplies a user's guide Wide bandwidth plus good c.m.r.r. Joules Watt Dedicated instrumentation controller for Nanno Herder theSC84and other computers SUPERCONDUCTING FETS 850 T.I. Vellacott STEP-UP SWITCHING REGULATOR NOVEL POWER SUPPLY 885 PC BUS PERFORMANCE 891 ASSERT COMPETITION 918 856 High -efficiency design for use with NiCd SCI -TECH '89 918 Two new personal computers use entirely cells. OBITUARY 918 new bus structures. N.J. Chaffey and T.A. Perkins William Nowlin 7`a'VON 11111 L.F. NAVIGATION REVIVAL LOGIC PROBE 897 COMMENT 843 867 Tracking vehicles by radio EVENTS 854, 881 Fast pulse -detecting probe based on a p.l.d. Richard Lambley B.J.Frost LETTERS 860 DEPENDENT SOURCE CIRCUIT IDEAS 864 PIONEERS THEOREM BOOKS 869 873 900 APPLICATIONS SUMMARY 871 Alec Reeves, inventor of p.c.m. Finding equivalent generators in a network SATELLITE SYSTEMS 903 W.A. Atherton which has no independent sources Harry E. Stockman TELECOMMS TOPICS 908 MULTIPROCESSOR NEW PRODUCTS 920, 927 PIEZOELECTRIC COAXIAL SYSTEMS RESEARCH NOTES 929 CABLE 875 905 TELEVISION BROADCAST 932 This third article examines the issues RADIO COMMUNICATIONS 934 involved in linking processors together Applications of a novel composite material Alan Clements Peter Johnson RADIO BROADCAST 936 ELECTRONICS & WIRELESS WORLD 841 TAYLORRF/VIDEO MEASUREMENT INSTRUMENTS UNAOHM EP741FMS MEASUREMENTS FIELD STRENGTH METER/SPECTRUM ANALYZER Frequency Continuously adjustable via a geared -down vernier as follows MADE EASY Range: IF 38.9MHz Band I 46 to 106MHz FM Band 88 to 108MHz Band III 106 to 290MHz Band H 290 to 460MHz Band U 460 to 860MHz Frequency TV Bands -4 digit counter with 100KHz resolution Reading: FM Band - 5 digit counter with 10KHz resolution Reading Accuracy: reference Xtal +/-1 digit. Function: NORMAL: picture only TV Monitor ZOOM : 2 to 1horizontal magnification of picture picture + line sync pulse (with chromaburst if TV signal is coded for colour] Panorama: panoramic display of the frequency spectrum within the selected band and of tuning marker Panorama Adjustable expansion of a portion of the spectrum around the tuned Expansion: frequency. Analogue 20 to 40dB. Static measurement of received signal. Scale calib- Measurement: rated in dBuV [at top of picture tube] to rms value of signal level. DC/AC Voltmeter: 5 to 50V Measurement 20 to 130dBuV in ten 10dB attenuation steps for all bands. Range: -60 to 130dBuV in nine 10dB steps for IF. Measurement ANALOGUE: brightnessstripeagainst calibratedscale Indication: superimposed on picture tube. The stripe length is proportional to the sync peak of the video signal. Video Output: BNC connector 1Vpp max on 75 ohm. DC Output: +12V/50mA max. Power supply source for boosters & converter TV Receiver: tunes in and displays CCIR system 1 TV signals. Other standards upon request. Additional (1] Video input 75 Ohm. [2] 12V input for external car battery. Features: (3] Output connector for stereo earphones. Price: £1344.00 exc. VAT and Carriage. UNAOHM FSM5987 T.V. FIELD STRENGTH METER INPUT Sensitivity: from 20dBuV to 110dBuV (-40dBmV to 50dBmV) or 10uV to 0.3V, in eight 10dB steps. Reading: dB reading proportional to peak value for video signals; proportional to mean value for AM or FM sound signals. For botn signals scale calibrated to rms value and expressed in dBuV Two mo-e scales are available: volt from 0 to 50, and ohm from 0 to 21300 ohm. Battery status is also provided. Accuracy: +/- 3dB for bands I & III +/- 6dB for bands H & IVN Impedance: 75 ohm unbalanced; DC component blocked up to 100V FREQUENCY Range: 46 to 860 MHz as follows: Band I 46 to 106MHz III 106 to 206MHz H 2C6 to 460MHz IVN 460 to 860 MHz Reading: 4 digit LCD readout. 100KHz resolution Price: £378.00 exc. VAT and Carriage. UNAOHM EH 1000 TELETEXT AND VIDEO ANALYZER Function: Eye Pattern: display of RF and video -frequency teletext signals by means of eye pattern diagrams both in linear representation and lissalous figures (0 and X). Line selection: display of video signals and line by line selection. Measurement of modulation depth. Teletext: monitoring of teletext pages. RF Input: Freq. Range: 45 to 860MHz. Frequency synthesis, 99 channel recall facility, 50KHz resolution, 30 channel digital memory. Level: 40 to 120dBuV: attenuator continuously adjustable. Indication of the minimum level for a correct operation of the instrument. Impedance: 75 ohm. Connector type: BNC. Video FrequencyMinimum Voltage: 1Vpp. Impedance: 75 ohm or 10K ohm in case Input: of a through -signal. Connector type: BNC. Teletext Input: Voltage: 1Vpp/75 ohm. Teletext Clock Voltage: 1Vpp/75 ohm. Measurement, Aperture of eye pattern: Input: linear or Lissalous figures, selectable. Indication: directly on the picture tube. A calibrated scale shows percentage of eye pattern aperture. Error: the instrument introduces an error of < 5% with video input and 20% with RF input. Jitter on regen'd clock: <25ns. Line selector: Selection of any TV line between the 2nd and the 625th scanning cycle by means of a 3 digit thumbwheel switch. Oscilloscope: VERTICAL CHANNEL: Sensitivity: 0.5 to 2Vpp/cm. Frequency Response: DC to 10MHz. Rise time: pre & overshoot < 2%. Input TAYLOR BROS (OLDHAM) LTD. Coupling: AC. Input Impedance: 75 ohm/50pF. TIME BASE: Sweep Range: 20 to 10ms (1.1/2 frames); 32; BISLEY STREET WORKS, LEE STREET, 64/192us [1/2; 1; 3 lines]. Linearity: +/-3%. Horizontal Width: OLDHAM, ENGLAND. 10 divisions; x5 magnification VISA TEL: 061-652 3221TELEX: 669911FAX: 061-626 1736 Price: £1870.20 exc. VAT and Carriage. ENTER 40 ON REPLY CARD COMMENT Predicting the unpredictable How technological advancements will affect the future is remarkably difficult to EDITOR predict. There is no need to go back to the industrial revolution to find evidence of this Philip Darrington statement. As many of you will remember, not too many years ago experts predicted EDITOR - INDUSTRY INSIGHT that the country would soon be run by a big brother computer. Geoffrey Shorter, B.Sc. Were it not for microprocessors we might now have a big brother. Admittedly there 01-661 8639 are a few large central computers doing mainly specific tasks, and the day might still come when our destinies are determined by a central supercomputer, but the majority DEPUTY EDITOR of today's processing is done locally - in offices. laboratories, shops, factories and in Martin Eccles 01-6618638 the home. And, on the subject of predictions, who can say with any certainty whether COMMUNICATIONS EDITOR computers will eventually create jobs or cause even more unemployment? Popular Richard Lambley answers to this question are frequently evaluated from political rather than computer 01-661 3039 knowledge, which is perhaps what flawed the central -computer theory. ILLUSTRATION One of the bolder predictions made recently comes from researchers at the Georgia Roger Goodman Institute of Technology who say that by the year 2000, operators will be instructing 01-661 8690 computers in plain language, not by entering commands on a keyboard.
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