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Electronics, Build This BUILD A TUNABLE SHORTWAV N ElectronicsCombined with Electronics, Build this and enter a new world of communications! 440 Build the LED Head electronic emotion machine! Practical Relay Circuits you can put to work The fundamentals of I/O Transfer on your PC Update on Caller ID: GERNSBACK Calling -name delivery _ 4E17:'"BE1R-lq, 5# 3031 T iPP 63 ii,i,,,ii,iiiii,,,11,,,i1i,ii,,,,,i1i,1 ,iii tiPF How to design and CHßTS BARKER 0?4H 41.1111111111.1.11. build your own $3.50 U.S. Electronic Games $3.95 CAN. www.americanradiohistory.com There are copies and then there are originals. Only Fluke meters - the original and most copied DMMs in the world - deliver the safety, quality and value they promise. They're built tough enough to achieve C.S.A. and U.L. listings, not to mention the considerable on- the -job punishment they endure. Each meter is loaded with features, of course. But those features are also designed to work together intelligently, so your job is easier. Faster. And safer. If you're going to spend your hard -earned money on a multimeter, why buy an inferior copy when you can own an original? See Fluke's full line of handheld meters and accessories at your local distributor; or call 1- 800 -87 FLUKE for the name and number. ORIG I NAIS FLUKE 87ní- F' "' ` METER 115airy mVA n FS% 9 13 MkEM 1 ;a v 1111111.1111111111111111111111111 MN MAX RANGE HOED II) PEAK RAN MAX - tll Q mV F V NA OFF A mA pA COM V (1-N- ¡ V LNOmA MARJ I FUSED J LIOAMAX MMJ FUSED m 1 FLUKE. G Copyright 1993 John Fluke Mfg. Co., Inc. P.O. Box 9090 M/S 250E Everett, WA 98206 U.S.: 206- 356 -5400 Canada, 416- 890 -7600 Other Countries' 206- 356 -5500 All rights reserved. Ad no. 00381 CIRCLE 121 ON FREE INFORMATION CARD www.americanradiohistory.com Actual Size J only qty.) VNA Amplifiers +17.5dBm, 0.5102.5GHz 20ó Freq.(GHz) .5 -.8 .8 -1.0 1.0 -2.0 2.0 -2.5 Very New Amplifiers...at a very affordable DC Gain (dB) typ. 14.0 17.0 18.0 16.0 price, from Mini -Circuits! Yes, VNA-25 RF amplifiers are very Max.Output (dBm) ( +17.5dBm typ. output at 1dB +17.0 small, yet incredibly powerful In Out 01dB Comp. typ. +18.0 +18.5 +17.5 compression ). The S 01 C -8 pin surface mount units operate I P 3rd Order (dBm) typ. +27 +27 +27 +27 directly from a +3V to +5V single DC supply with 18dB typ. 1.5:1 1.7:1 1.7:1 1.5:1 band. VSWR Output typ. gain and cover the popular 0.50- 2.50GHz wireless VSWR Input typ. 6.4:1 2.8:1 2.0:1 1.4:1 are These units are very easy to use because all capacitors Dc Power.: +5.0v for specified performance. internal and RF/DC connections are separate, eliminating the Current,(mA): 85typ., 105 max. Thermal Resistance. Junction -to -case: 125° C/ W coupling capacitors and an RF choke. You can buy these very need for both external Price ($) ea. : 2.95 (qty. 1000), 4.95 (gty.10). low price of just $2.95 ea., gty.1000. Development gty.10, only new amplifiers for the *All specs at 25 °C (case temp. 35 °). $4.95ea.! So, call Mini -Circuits today for immediate off -the -shelf availability and *Available in Tape and Reel, MTTF at 150 °C max. junction temp.: 3x107hrs.typ. 1 week shipment. guaranteed 'Case' is defined as mounting surface of leads. Mini-Circuits...we're redefining what VALUE is all about! Mini- Circuits® P.O Box 350166, Brooklyn, New York 11235-0003 (718) 934-4500 Fax (718)3324661 EEM MINI -CIRCUITS' 740 - pg. HANDBOOK. For detailed specs on all Mini -Circuits products refer to THOMAS REGISTER Vol. 23 MICROWAVES PRODUCTS DIRECTORY For You. CUSTOM PRODUCT N EEDS ... Let Our Experience Work F 180 Rev Orig CIRCLE 180 ON FREE INFORMATION CARD www.americanradiohistory.com GET THE LATEST ADVANCES IN ELECTRONICS SUBSCRIBE TO- Electronics Electronicw"" ENJOY THE WORLD OF ELECTRONICS EACH MONTH! rogr LuriL Ric( Subscribe to the best informed electronics maga- Learn how to design with zine -the one that brings you the latest high -tech rogrammnbm logic deie od build this Iowcost construction PLD PROGRAMMER projects, feature articles on new tech- Mid this nology, practical troubleshooting techniques, circuit design fundamentals, and much more. ant ImarnYe the oaalarma 01 art FMraCia Electronics Now looks to the future and shows you You can Wert.' more what new video, audio and computer products are on than 1000 calore with o the horizon. You'll find helpful, monthly departments such as Video News, Equipment Reports, Hardware 9oHd tow OM Hacker, Audio Update, Drawing Board, Computer for tour 0004010 Connections, New Products, and more. All designed to '4,t!,. 7 ° MOO pun, ABN0 uoáu t1iAo elletta,a Ms Yen give you instruction, tips, and fun. Electronics Now gives you exciting articles like: Buyer's Guide to Digital Oscilloscopes Build A Scanner Converter Single -Chip Voice Recorder Build A MIDI Interface for your PC Troubleshoot Microprocessor Circuits Build A High -Power Amplifier for your Car Add Music On Hold to your Phone All About Binaural Recording VGA -to -NTSC Converter FOR FAST SERVICE CALL OUR TOLL -FREE NUMBER! 1-800-999-7139 DON'T DELAY SUBSCRIBE TODAY! If you prefer, just fill out the order card in this magazine and mail it in today. - 2 www.americanradiohistory.com .duly 1994 Mimics, Vol. 65 No. 7 31 AMATEUR TV STATION Build this two -way TV station for both base and mobile operation. William Sheets and Rudolf F. Graf 41 THE "LED- HEAD" Watch our Electronic Face change its expression! Roger Sonntag 60 TUNABLE SHORTWAVE ANTENNA PAGE 41 Build this tunable antenna for improved shortwave reception. H.J. Wecke 67 TAKE BACK CONTROL OF YOUR TELEPHONE Upgrade February's Caller -ID project to provide name delivery. Terry J. Weeder ;Év: m--.,,..k...-p- PAGE 60 55 BUILD THIS PC I/O BREADBOARD The fundamentals of I/O transfer using Basic, Quick C, and DEBUG. Dave Dage 62 BUILD THIS COMPUTERIZED GAME Learn about computer games as you build the C -Game. Dan Retzinger E H NOLOG 49 RELAY OUTPUT CIRCUITS PAGE 62 Build one or all of these transistorized circuits that can switch and time relay functions remotely. Ray Marston 94 Advertising Sales DEP rr T 1 i 1 J Offices 8 VIDEO NEWS 78 AUDIO UPDATE 94 Advertising Index What's new in this fast - SPL damage /sonic realism changing field. Larry Klein 91 Buyer's Mart David Lachenbruch 80 DRAWING BOARD 16 Letters the PLL 20 EQUIPMENT REPORTS Build tachometer's 26 New Lit Wavetek BDM40 Benchtop section. Digital Multimeter. Robert Grossblatt 22 New Products 71 HARDWARE HACKER 86 COMPUTER 10 Q&A violations CONNECTIONS Second law and 6 What's News hacker opportunities. And then there were none. Holtzman Don Lancaster Jeff 3 www.americanradiohistory.com Bearania NOW R Hugo Gernsback (1884-1967) founder Although two -way amateur televi- sion (ATV) has been around for Larry Steckler, EHF, CET, years, the prohibitive cost of the editor -in -chief and publisher surs. vw..a. a«aw.r v..r,rrw necessary equipment put it out of EDITORIAL DEPARTMENT reach for most radio amateurs. But, Brian C. Fenton, editor thanks to recent advances in solid - Marc Spiwak, associate editor state technology, prices for ATV Neil Sclater, associate editor components have dropped dramat- Teri Scaduto, assistant editor Jeffrey K. Holtzman ically. This month, we show you how computer editor to take advantage of those afford- Robert Grossblatt, circuits editor able VCRs, camcorders, color N Larry Klein, audio editor receivers, and tiny video cameras David Lachenbruch contributing editor by incorporating them into a mobile, Don Lancaster battery- operated AN station weigh- contributing editor ing less than five pounds. Four re- Evelyn Rose, editorial assistant lated AN projects are presented: a ART DEPARTMENT complete AN transceiver; a 5 -watt, Andre Duzant, art director three -channel transmitter only; a 3/4- Injae Lee, illustrator watt, single channel Mini AN trans- Russell C. Truelson, illustrator mitter; and the 3/4 -watt, single -chan- PRODUCTION DEPARTMENT nel "AN Jr." (without audio ca- Ruby M. Yee, production director pability). Turn to page 31. Karen S. Brown advertising production Kathryn R. Campbell production assistant NEXT MONTH CIRCULATION DEPARTMENT Jacqueline P. Cheeseboro circulation director THE AUGUST ISSUE Wendy Alanko circulation analyst GOES ON SALE Theresa Lombardo circulation assistant JULY 5. Michele Torrillo reprint bookstore COMMERCIAL EDITOR Typography by Mates Graphics Get rid of the commercials from your videotapes! Cover by Loewy Design. Photography by Christopher Gould. CIRCUIT COOKBOOK Electronics Now is indexed in PLL Basics Applied Science & Technology Index, and Readers Guide to Periodical Liter- ature. Academic Abstracts. and RESTORE IT RIGHT! Magazine Article Summaries. Working with vintage audio gear. Microfilm ii Microfiche editions are available. Contact circulation depart- EPROM PROGRAMMER ment for details. Put the IBM PC I/O breadboard to work. Advertising Sales Offices listed on page 94. As a service to readers, ELECTRONICS NOW publishes available plans or information relating to newsworthy products, Electronics Now Executive and techniques and scientific and technological developments. Because of possible variances in the quality and condition of Administrative materials and workmanship used by readers, ELECTRONICS NOW disclaims any responsibility for the safe and proper Offices functioning of reader -built projects based upon or from plans or information published in this magazine. 1 -516- 293.3000.
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