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BROTHER SCIENCE Lightning and the ATCH Ionosphere ELECTRONIC I ,t i WIRELESS WORLD OCTOBER 1989 £1.95 .o VANDELBROT Fractals, chaos and computers i BIG BROTHER SCIENCE Lightning and the ATCH ionosphere ELECTRONIC SOFTWARE SURVEILLANCE CAE reviews for the PC 7en nark I)hr. 4f{.IIII C..marta DM 12.00 l:rr.ce Dra. 60 11. Hunt OFI. 12.511 1 0 ' Italy L 65110 IR til.'17 spain Pta. 71111.00 ?izttapsr SS I 1.2:5 I:sA 5.5.43 i 9 770266 324004 « Carlton -the leaders in top quality z\I\`<) DC YOt)5r/-j)o» /' l second user ry,.,( I rw,iau equipment It ) KN\11Y. YOUR HOTLINE FOR EQUIPMENT ADVICE AND STOCK GUIDE CALIBRATORS COUNTERS DATA L _OGGERS LOGIC ANA' 5 S'SRS OSCILLOI NETWORK ANALYSERS PO OWER METERS PROT' , E, COMPUTERS PRINTER/PLOTTERS -ERS COMPUTER TERI,' DATA COMMUNICATION T uT:ON TESTERS MAINS TES' Every item we sell is fully refurbished back to manufacturer's original specifications. Our Stock Guide ANALYSERS - SIGNAL DATA/COMMUNICATIONS TEST Hewlett Packard Hewlett Packard lists every- - 3561A Dynamic signal analyser. 0-100kHz £6900 4951 A Protocol Analyser. with upe (1500 3581C Selective level meter C2750 49618 Protocol Analyser £2500 thing we supply 8566B Spectrum analyser. high performance C35.000 over 10,000 8970B Noise Figure Meter - items. Ask (5500 GENERAL PURPOSE TEST for your free copy today! & MEASUREMENT COMPUTER PRODUCTS Dranetz Hewlett Packard 305C Phasemeter. with 305 PA.3001 plug-in (4500 2225A Thmklet Punter. HPIB interface (295 Philips 626 Mains disturbance analyser (2600 85A ComputerlController (650 PM33II 125MHz rate 808A Power demand analyser (2750 sampling DSO £1750 850 ComputeriController (1400 Tektronix 9122D Disc Drive. dual -sided. 142Mb C650 2235 IOOMHz. dual channel oscilloscope (900 IBM LOGIC ANALYSIS 2213 50MHz dual trace (400 ATE PC with 286 processor, floppy 1.2Mb £1150 Hewlett Packard 2213A SOMHz dual trace (450 PC Twin Floppy PC 095 1630D Logic Analyser. 43 channels to I00MHz (2500 XT XT with 10Mb Computer 10Mb hard disc (395 16306 Logic Analyser. 65 channels to I00MHz (4500 SIGNAL SOURCES 1650A Logic Analyser. 80 channels to I00MHz (5700 COUNTERS AND TIMERS Hewlett Packard 3312A Function Generator (825 Hewlett Packard OSCILLOSCOPES 3325A Synthesised Function Generator (2500 5328A IOOMHz Counter/Timer with opt. 020 £575 Gould Marconi Racal 054020 DSO. 10MHz with 2MHz clock. XY out (800 2022 Signal Generator. IGHz (2150 9906 Counter/Timer. DC to 200MHz (250 DATA LOGGERS Solartron 3530lB Solid state selector card (250 3530A 'Alpha' Data logger mainframe £3000 3530D Delta' Data logger mainframe £3950 ll LLLTRONK5 CARSTON ELECTRONICS LIMITED 2-6 Queens Road Teddington I 1 Middlesex TW OLR Tel: 01-943 4477 Fax: 01-977 9232 - Telex: 938120 CIRCLE NO. 1 ON REP! 8 CARD CONTENTS OCTOBER 1989 VOLUME 95 NUMBER 1644 Lightning strikes. Magnetoresistive sensors. ,at. rv 946 Thunderstorms are a voltage 1010 There are more ways to r stabilizer between the ionosphere and measure magnetic flux than Hall effect Earth's surface, says Anthony and inductive loops. Magnetoresistivity Hopwood. provides a useful alternative. Fractals, chaos and Passive optical networks. The x 3!1r -.-1110r-,. =ºo 957 computing. A fashionable 1013 use of copper in public branch of mathematics may yield switched network wiring may he a answers to important questions, thing of the past. Optical telecomms , : - - _ - hut is it art? may provide a high tech alternative. CER.N's super collider - all 27km of it - is already producing a new view of Stepping on the GaAs. SPECIAL FEATURE fundamental matter. Even bigger 984 Microwave integrated circuit machines are being planned, page 944. technology is pushing the limits of high frequency performance. Fred Myers of Plessey's Caswell research facility next issue defines the limits. Review - ECA-2 and PSpice. 989 Simulating a circuit on a PC can replace weeks of costly building and testing. We present a review of two leading software packages. ó I spy. Lee Tracey acts as a quartermaster and adviser to Sensors & Systems papers. Western security services. He has also 1006 This year's conference on worked as a field officer in our own transducer and systems technology Government agencies. He gives a offers < particularly rich choice of personal zccount of the technology subject matter. We present highlights used in professional electronic from the presentations. surveillance. REGULARS 939 Comment. Green light for 1015 Pioneers. Léon Charles Thévenin electronics, a sensible alternative gave. the world a theorem. His to defence spending. paper "Extension of Ohm's Law to was 941 Research Notes. Micron -sized complex electrical circuits" conductors, the fading star of introduced as "a new theorem of superconductivity, water from oil. dynamic electricity". optical delay and smashing 1019 Analogue Action. The design electrons. forum for analogue circuit 9.9 Update. News from around the engineers. industry. 1021 Circuit ideas. Z80 compatible In next month's issue. Audio amplifier 967 New Products Classified. The FSK transmitter. composite' design is one of the few areas of monthly round -up of new products feedback amplifiers, random electronics where science appears to at -a -glance. security light and transistor tester mix uneasily with art. The issue pits with integral hr,. measurement. those who believe in the evils of 995 Letters. Anti -gravity (yet again) feedback, the sound quality of oxygen - 1023 RF Connections. Minimum power gyros, cold fusion, pseudo -science, free copper wire and the necessity of radio telemetry, low -noise doubt and faith and more. using go'd-plated connectors against oscillators and radio physics. 1001 Applications. Switch mode power those who advocate calculated supply without the switching. electronics. Doyen of audio designers switched capacitor notch filter, John Linsley Hood presents the first of Wheatstone light bridge and a series of articles on the evolution of serial/parallel D to A. the audio power amplifier. Readers in the USA facing difficulties in obtaining this magazine are invited to call Worldwide Media Services Inc. toll free on (800) 345-6478. October 1989 ELECTRONICS WORLD + WIRELESS WORLD 937 TAYLOR RF/VIDEO MEASUREMENT INSTRUMENTS _MEASUREMENTS MADE EASY UNAOHM EP741FMS FIELD STRENGTH METER/SPECTRUM ANALYZER - Frequency Range: 38 9MHz to 860MHz, continuously adjustable via a -down geared vernier rmatdw.úli-. uil Frequency Reading: TV Bands - 4 digit counter with 100KHz resolution FM Band - 5 digit counter with 10KHz resolution Reading reference Accuracy Mal .l- 1 digit Function: NORMAL picture only TV Monitor ZOOM 210 1 horizontal magnification of picture a ¡i!..»: picture a line sync pulse (with chromaburst if TV signal is coded . i for colour á (M Panorama: Panoramic display of the frequency spectrum within the selected band and of tuning marker 1 Panorama Expansion Adjustable expansion of a portion of the spectrum around the tuned frequency Analogue 20 to 40dB Static measurement of received signal Scale calibrated m dBuV (at top of picture Measurement: 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. -60 to 130dBuV in nine 10dB Range: steps for I F Measurement ANALOGUE brightness stripe against calibrated scale superimposed on picture tube. The stripe Indication: length is proportional to the sync peak of the video signal Video Output: 3NC connector 1Vpp maximum on 7551 DC Output: .12V/50mA maximum Power supply source for boosters and converters TV Receiver: Tunes in and displays CCIR system I N signals Other standards upon request Additional ,1) Video input 7551. (2)12V input for external car battery. (3) Output connector for stereo Features: earphones PRICE: £1344.00 nett. excluding V.A.T. and Carriage UNAOHM EP742 FIELD STRENGTH METER/SPECTRUM ANALYZER Speer cation as EP741 . Synthes zed Tuning 99 channels, Programme Storage (EP815 Sateite Converter can be added as illustrated) ,.,, :ra , PRICE: £1498.00 nett. excluding V.A.T. and Carriage ,. UNAOHM EP815 ._ i: T.V. SATELLITE CONVERTER Frequency Range of 950MHz to 1750MHz Frequency is continuously adjustable through a geared -down control. : a<^'I : ;.Sati..--i:: Input Signal: Frequency Reading: Throughout the frequency meter of the associated field strength meter Input Signal Level: From 20 to 10061uV in two ranges -20 to 70 and 70 to 100. Power Source: Available at BNC input connectors as follows 15V DC/0 5A internal or 25V DC maximum external Satus Indication: Continuity, overload and short circuit conditions of power circuit are all shown by LED lights Demodulation: FM for PAL and SECAM coding. Switching to MAC system is provided together with room for an optional MAC decoder Audio Subcarrier. 55MHz to 7 5MHz continuously adjustable. Provision for an automatic frequency control PRICE: £536.20 nett, excluding V.A.T. and Carriage UNAOHM EP760 COLOUR TV FIELD STRENGTH METER INPUT Sensitivity: 20 to 130dBuV in ten 10 -dB steps for N and FM bands 50 to 130dBuV in eight 10 -dB steps for I F IJpo*® Readout: Digital input signal level provided directly in dB. FREOUENCY , N; Range: 38.9MHz to 860MHz _ Selection: -99 channel frequency synthesis within bands I-III-IV/V. -30 program storage . 7 capabilities -manual tuning with sharp-tune control 1 aa. w`iai' rww Readout: Two LCD displays, the first for channel or program, the latter for frequency in MHz s s c L_ with 100KHz resolution for TV bands and 10KHz for FM SPECTRUM ANALYSIS :1> Frequency Range: The TV FM range It ntu entire and is to a r possible display portion of the selected .1%y band. - Marker: Two markers are available in different colours and with digital frequency reading UNAOHM Irk addition to locating frequencies, they are used to define frequency intervals. Video Filter: A switchable video filter is provided to improve measurement accuracy in ccnnection with Unaohm noise generator NG750. SYNC PULSE DISPLAY Display: The entire horizontal blanking time, sync pulse and burst included, is displayed on the left side of the picture tube AUDIO Mono: TV and FM audio can be heard through a loudspeaker.
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