DOCSLIB.ORG

Elementary M ARCH a IL

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Elementary M ARCH a IL U DERSTANDING DIODES: THE ELECTRONIC TRAFFIC COPS elementary M ARCH A IL EIectroiçsa BE A TARZAN IN THE PARTS BUYING JUNGLE, page 3341 EL ONIC TS THAT LL Guards me t Switch Cuts cial Itch "Updating the Radio Shack Eli TRS-80 "Universal Whistle Switch "Regency Flight Scanner Vigilite Timer E&L Mini Micro Designer "Edmund Digital Thermometer Percom LFD-400 Floppy Disc " Heathkit TV Vectorscope 03 FAREWELL TO THE KING OF THE HOBBYISTS, 71 86 0 342 page 57 The Cobra 50XLR CB has it all. Installation Kit makes them the AM /FM Stereo. Cassette. And easiest in -dash radios to instal. And CB. Al in one compact unit. All our Nationwide network of Author- engineered to bring you the same ized Service Centers makes them loud and clear sound Cobra is the easiest to service. famous for. There are four Cobra in -dash The remote mike houses the models to choose from including channel selector, squelch control, AM /FM /Stereo/8- track /CB. But no and channel indicator. So all you matter witch you choose you can need for talking CB is right there in be sure of getting the best sounding your hand. The cassette player fea- radio going. The ultimate car radio. tures t_zrough the dial loading and The Cobra. four -way fader control. Because they're only five inches deep, there's a Cobra in -dash radio b ra to fit almost any car with little or no Punches through loud and clear. Cobra Communications Products modification to the dash. This DYNASCAN CORPORATION 6460 W Cortland St., Chicago, Illinois 60635 feature, plus the step -by -step Write for color brochure Installation Manual and Universal EXPORTERS. firm Plaicvir w. N Y CANADA: P.P,:r., r:., -ti n. CIRCLE 6 ON READER SERVICE COUPON THE ULTIMATE CAR RADIA OFF/ VOL 4. TONE - MONVANL LO CB FM O PiOFF ST IIIII ECFD)R3 ALL THE MOST WANTED FEATURES AT A MOST WANTED PRICE... BIG ' -UGH LCD DISPLAY USE INDOORS OR OLT 200 F OUR 9V BATTERY LIFE AUTO ZERO, POLARI-Y, OVERRANGE INDICATION ON141195 100 ny DC F.S. SENSITIVITY HICKOK 19 FANGES AND FUNCTIONS THE HCClaü( ELE TRCAL INSTRUMENT CO. 10514 =ux n. Avenue Cleveland. Ohio 44108 (216) E41 -8060 TIM: 810- 421 -8286 Here is the handfull of accuracy you've been waiting for. Hand - 3onely encased. Z:ompact. Efficient. Rerz v3ble cover stores tea t Cnly12ounces. set lag- fished as part of the LR Hickok's exciting, HICKOK new LX 303, 3%2 LX 303 digit Mini- Multime- 11 04VmA ter with high quality components, one year guarantee and rugged Cyco- lacl) case offers Ava fable accessories incl_de AC features previously acJYer, padded vinyl carrying case found only in ex- 40.V DC probe, 10 Amp C,C shunt e -Isive units...at a p- ce under $75.00: So why wait any longer? The amazing LX 303 is here. NOW! Another American nade test equip - me -t breakthrough >: J DCV probe adapter ,ailable f: protecting input up tc 1OKV -rom Hickok, The Value innovator. Order today! e your local Hic ok distribu :or or order below SPECIFICATIONS: ELECT1CNIC OISTRIE.UTORS,INC. 490C EISTO AVE. DC VOLTS (5 RANGES): 0.1 mV to 1000V; Acc _ -acy CHICAGO IL 60630 ± 0.5% rdg ±O.E % f.s.; Input imped: 10M S2; Ma).. Tel 3'2-283-4800 input 1 kV except 500V on 2COmV range. AC VOLTS (40Hz to 5kHz): 0.1V to 600V; Accu acy: PL ?SE SEND ME MEIN Hickok L).303 Digita Mu timeters @ 74.95 ea. ± 1.0% rdg ±0.5% f.s. ( -2.1E max. at 5kHz); Max. RC -3 AC Adapter, 1-5VAC (ZOVAC avai .) @ 7.50 ea. input: 600V. CC -3 Deluxe Carrying Case @ 7.50 ea. RESISTANCE !6 LOW POWER RANGES): 0.- alto VP -10 X10 DCV Pobe Adapter @ 14.95 ea. -1 10A DC @ 14.95 ea. 20M0; Accuracy: ±0.5% rdg ±0.5% f.s. ( ±1.5; rdg CS Current Slvnt on 20M0 range; input protected to 120VAC1i' VP -40 4C KV DC Prcte ._ @ 35.00 ea. ranges. [ Payment encicsed Bill my: D Waster Charge EIVISA DC CURRENT (6 RANGES; :A1 nA to 100mA: Account Nc. Cep Date Accuracy: -±1.0% rdg ±0.5% l s. DIMENSIONS AND WEIGHT: 5 -7/8" x 3 -3/8" z Norte Signatur Address 1 -3/4 ", 12 oz.; POWER: 9/ batt. (not incl.) or -iickok AC adapter; READ RATE 3 /sec. OPERATINC I Ott State Zip TEMPERATURE: 0 ° -50 °C. .1 do $3.00 Postage and Handling. IL. residents add sales tax CIRCLE 1L9 On Rti11FA CrovIrr rem lamN THE STAFF March /April 1979 Volume 19, No. 2 Editor -in -Chief Julian S. Martin elementary Managing Editor Alan H. Rose, K2RHK Technical Editor Gordon Sell, KBDA1464 Associate Editor Lee Lensky, KAJR2410 Citizens Band Editor Kathi Martin, KGK3916 electronics Editorial Assistant McClean, KBKF3780 Cynthia UNTANGLE THE CONSTRUCTION JUNGLE Workbench Editor 33 The Fine Art of Buying Parts -save big bucks in the parts- buying market Hank Scott 37 Cyclops -keeps an eye on your home day or night Art Director 43 Remote Controller-turn it on or turn it off with the speed of light Ralph Rubino 62 Stoppit -be the quickest guy or gal on your block Associate Art Director David Pindar KEEPING UP WITH COMPUTERS Assistant Art Director punch with Level Il Basic Michael Vessio 42 Updating the Radio Shack TRS-80--add 70 Simply Basic -our computer whiz invents an inventory program Cover Art Director 73 Control That Tape -handy device ends tape handling hastíes Irving Bernstein 77 Computer Readout-how computers talk to other machines Art Editor Joe Groom AND Art Assistants DXING THE FAR WIDE Celeste Barbera 40 Tropical DX- explore the world of Yucatan shortwave Leslie Wallant 50 DXing at the Speed of Sound -ride the copilot's seat in the big jets Advertising Manager Ralph Vega HE PUT A RADIO SHACK IN EVERY TOWN Advertising /Research Associate 57 King of the Hobbyists -Charles D. Tandy, 1918 -1978 Jyll Holzman, KAKZ1490 Production Director Carl Bartee ELECTRONIC THEORY TO CUT YOUR TEETH ON 53 Antique Radio Corner -tuned RFs: how Grandpa made his circuits hot Production Manager diodes, the electronic traffic cops Carole Dixon 79 Basic Course -understanding Production Assistant Annette Simon e/e CHECKS OUT AT THE ELECTRONICS BAZAAR Newsstand Circulation 45 Universal Whistleswitch -the ultrasonic servant Director 49 Regency Flight Scanner -cruise the aircraft band Don Gabree 52 Vigilite Timer -makes your home look lived in when you're far away E -1 electronic classroom in a box Director 59 &L MMD -an Subscription Circulation 64 Edmund Digital Thermometer -get your reading in a flash Robert V. Enlow 67 Percom LFD -400 Floppy Disc -meet the megabyte master Subscription Circulation Manager 75 Heathkit Vectorscope -tune up your color TV like the experts do Eugene S. Slawson Marketing Director COMMUNICATIONS COUNTER James C. Weakley 55 Getting Your BNEE, Semester IV -it's time to graduate 69 Kathi's CB Carousel -Kathi finds out why Thomas J. was elected President and Publisher 72 CB XCVR Checkout -e /e looks at four great new transceivers Joel Davis Vice President and OUR REGULAR DEPARTMENTS General Manager 5 Hey, Look Me Over -new products from far and near Leonard F. Pinto 12 Newscan-keeps you abreast of developments Vice President and Treasurer 14 DX Central -Don DXs outer space Victor C. Stabile, KBP0681 16 Ask Hank, He Knows-don't worry, Hank's.here Cover Stories 22 Bookmark -by Bookworm 24 Hi -Fi Reports -be an audio MD ISSN: 0013-595X 83 Literature Library- there's a lot more than you think to read ELEMENTARY ELECTRONICS is pub- lished bi- monthly by Davis Publica- tions, Inc. Editorial and Executive of- .c.eE, fices: 380 Lexington Ave., New York, ,.. NY 10017; all subscription orders and mail regarding subscriptions should be sent to P.O. Box 2630, Greenwich, tig5 CT 06835. In U.S.A. and possessions, 1101010. OF one -year subscription (six issues) $6.95; two -year subscription (12 is- sues) $12.95; three years (18 issues) $18.95; and tour years $23.95. Else- where, add $1.00 postage for each AUTHORS IN THIS ISSUE year. For change of address, please advise 6 to 8 weeks before moving. Barbarello, Anthony Ca- label James Send us your current mailing Fred, Herb Friedman, with new address. Advertising offices: risti, James New York, 380 Lexington Ave., New Larry Friedman, Harry Helms, York, N.Y. 10017, 212 -557 -9100; Chi- Jr., Don Jensen, Christopher cago, 520 N. Michigan Ave., 312 -527- Kilian, Lewis Kornfeld, Kathi 0330; Los Angeles; J. E. Publishers' Rep. Co. 8732 Sunset Blvd. 213 -659- Martin, Ralph Perry, Hank Scott, 3810. Applications to mail at con- Gordon Sell, Walter Sikonowiz, trolled circulation rates are pending at Thomas Illinois. Copy- Thomas Sundstrom, N.Y., N.Y. and Sparta, by Ron Macarty right 1979 by Davis Publications Inc. Williams Cover drawing 2 ELEMENTARY ELECTRONICS /March -April 1979 Talk yourself into the best. President SSB. It won't be hard. Channel 9 for emergencies, Channel 19 for the road, and the Just tell yourself about the Adams -President's finest SSB channel of your choice. mobile -and about how you'd enjoy the extra range and per- Now clinch the deal by mentioning President's superior formance of SSB. quality in design, electronics and craftsmanship. Take yourself into a President dealer and show You'III have talked yourself into the best. yourself how beautiful this machine would And, after all, don't you deserve it? look in your machine.
Load more

Recommended publications
  • Tape Re Rding
    TAPE RE RDING 1,01.00..... vow Tow, low, wow,- loom" i,xnosszyi 'ST szno7 1-8 'any usngZi7 ILO DT/9H .zamats I* A.zaa.zo 'sYz Recording at the Zoo August, 1961 35c WE DON'T CARE IF IT'S SINGLE TRACK Al DUAL Havai EVEN af10 national tape can duplicate national tape can duplicate national tape can duplicate national tape can duplicate national tape can dupl icat national tape can d'plical Major users of magnetic national tape can duplical national tape can duplico' tape look to national tape can ilup!ieal NATIONAL TAPE ii VitivaaI lape err II ii ii plies, national lape eon drlpliral for superior processing national lape can rinrplieu national Jupe ea >r rlllplira +' of tape duplicates II u l i o n a l lap e u rr rl rr li /iea national lape ea a rlrlitlieu national lape eo n il ii pl ;poti Language Laboratories nnlinII al tape eau rlulrliea' Recording Companies a rr 1 if) Ii rI I / II p «' a ìi rl n i pl i e u Radio Stations nufinnal la pc eu i!uiplieu' u e ,r Audio -Visual Producers rl l i ri it a I 1 a p r e a ri el rr l i Vi o (I (I I later rn Background Music Operators ralinnal lape eu Book Publishers a l iriH11I Ill pr l'a rr ' rr l,i,r u Corporations using I it l i anti/ t rpl e rn ll to p iea I tape for intercommunication al i inn l la p( ea a d alit i ea / raliaII aI lape e rlulrliea! Tape Recorder Manufacturers ,rr IloIiUI 1 rr pr eet it el n p/ ire 1 a 1 Ì n il rr I tripe e u rr rl rr a l i e n .
    [Show full text]
  • Large Diaphragm Condenser Microphones
    PRO AUDIO LARGE DIAPHRAGM CONDENSER MICROPHONES Large Diaphragm Condenser Microphones A go-to mic choice for tracking vocals, voice overs, string instruments such as acoustic guitars and violins, percussion, and more, B&H carries a wide variety of large diaphragm condensers to suit a variety of needs and budgets. Available selections provide polar patterns ranging from supercardioid (very narrow pick up path) to omnidirectional (360 degree pick up), while many can handle SPL levels as high as 150dB for use on louder sound sources. Many selections include stands, cases, and cables, and come in a wide variety of finishes. Brand AKG Aston Audio-Technica Behringer Blue CAD MXL Microtech Gefell Model P420 C 414 XLII P220 Origin AT2020 AT2035 C-1 BlueBird SL Baby Bottle SL Kiwi E100S M179 V67G M 930 Diaphragm Size 1” 1” 1” 1” .63” .96” .63" — — 1" 1” 1.1” 1.26” 1” Polar Pattern Multi Multi Cardioid Cardioid Cardioid Cardioid Cardioid Cardioid Cardioid Multi Super Cardioid Multi Cardioid Cardioid Freq Response 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz 40Hz-20kHz 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz 40Hz-18kHz 10Hz-20kHz 30Hz-20kHz 40Hz-18kHz Dynamic Range — 134dB — — 124dB 136dB — 126.3dB 123.2dB — — 133dB — 135dB S/N Ratio 79dB 88dB 78dB 76dB 74dB 82dB — 82.3dB 83.2dB 85.5dB — 11dB 74dB — Pad -20dB -6db,-12dB,-18dB -20dB -10dB N -10dB — -20dB -20dB N -10db -20dB N N HP/LC Filter YYYYNY—YYNYYNN Max SPL 155dB 140dB 155dB 127dB 144dB 148dB 136dB 138dB 134dB 138dB 150dB 143dB 130dB — Included Acc.
    [Show full text]
  • Audio-Technica Turntable & Cartridge
    Audio-Technica Page 1 Audio-Technica Turntable & Cartridge Price List 04/2014 Net Price List PROFESSIONAL USER ALL PRICES AND SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Effective April 10, 2014 Subject to change without prior notice. All former price lists expire with the publishing of this version. ll prices are suggested net retail prices; ex works. Pro-Audio & Lighting Solutions There are applicable our General Terms of Business, only. www.pro-technica.com BUY ONLINE at www.MusicWorld.bg 1,20 EUR Aricles marked with PHO (phase out) will be discontinued soon! EUR EUR EC Model Description Netto + 20% DDS (ex. VAT) (incl. VAT) Turntables & Electronics Get your classic albums off the shelf and into your MP3 player Audio-Technica brings its legendary quality and audio fidelity to the digital realm with this LP-to-digital recording system. The AT-LP60-USB stereo turntable comes equipped with a USB output that allows direct connection to your computer. The system also offers: Mac- and PC-compatible Audacity software; an integral dual-magnet Audio-Technica phono cartridge; and a USB cable and adapter cables. The turntable also features a built-in switchable phono/line preamp that allows connection to a YF AT-LP60USB 141,00 169,00 EUR stereo system equipped with either a phono or line-level input. AT-LP60-USB turntable featuresUSB output—connects directly to your computer; Mac- and PC-compatible Audacity software digitizes your LPs; Fully automatic turntable operation with two speeds: 33 1/3, 45 RPM; Professional aluminum platter Included cables connect to your stereo or powered speakers; Integral Dual Magnet™ phono cartridge with replaceable stylus; Switchable built-in pre-amplifier with line- level RCA output cables USB Direct-Drive Professional Turntable.
    [Show full text]
  • Location of Controls
    Layout & Controls: 1) Dial pointer 2) LCD display 3) Functions switch 4) Power LED indicator 5) Power on/off, volume up/down knob 6) Bluetooth LED indicator 7) MP3 folder up button 8) Source button 9) Bluetooth/Phono button 10) Record button 11) CD door 12) SD/MMC card slot 13) Radio band selector switch 14) FM stereo LED indicator 15) Tuning knob 16) Remote sensor 17) Skip/search down button 18) Skip/search up button 19) CD door open button 20) Play/pause/stop button 21) USB socket 22) 3.5 mm headphone jack 23) Tape forward / eject button 24) Cassette door cover 25) Mobile drawer 26) Aux in jack 27) Spindle adaptor 28) Turntable selector 29) Auto stop switch 30) Pick-up holder 31) FM wire antenna 32) Line out socket (l/r) 33) 110/220V selector 34) AC cord Caution: Usage of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. This unit should not be adjusted or repaired by anyone except qualified service personnel. Precautions for use Installation • Unpack all parts and remove protective material. • Do not connect the unit to the mains before checking the mains voltage and before all other connections have been made. • Do not cover any vents and make sure that there is a space of several centimeters around the unit for ventilation. Connection Caution: Before connecting the AC cord to main AC power outlet, please check carefully the supply voltage of your location and select the proper voltage position of the 110/220V selector(33).
    [Show full text]
  • NEW! We Offer Over 700 Top Brands, Low Prices and Outstanding Service
    204 POWERED MIXERS (W/BUILT-IN AMPLIFIERS) PMP4000 PMP6000 PA12CP ALLEN & HEATH PA12CP/PA20CP POWERED MIXERS All the tools you will need to run a standard stereo PA BEHRINGER EUROPOWER system including dual stereo channels CONSOLE POWERED MIXERS (two unbalanced stereo inputs each). These mixers feature an ultra-compact & lightweight design. Each model has a 24 bit The master section includes background music BGM mode with 2-track input (RCA) stereo FX processor with 100 presets, FBQ feedback detection system, IMP grade mic and a 3-color 12-segment LED meter displays. Mono channels have mic (XLR) and preamps with switchable 48V phantom power, 3 band EQ with switchable low cut filter line (TRS) inputs with individual +48V phantom power switches. Also features and clip LEDS on all mono channels. In addition, they each have stereo 7 band EQ on switched 100Hz high pass filter, 4-band EQ, 4 aux mixes, mute with LED, PFL button monitor or main outputs, a standby switch to mute all mic channels during breaks when with LED, 100mm faders, 16-program digital FX, and 4-pin XLR lamp socket. They have background music is provided via tape inputs, a XPQ3D stereo surround effect, and a 2 x 500W RMS peak power professional class AB power amplifiers built-in with full voice canceller function for karaoke applications. Both have dual Speakon outputs. output into 4 or 8ohms. ITEM DESCRIPTION PRICE ITEM DESCRIPTION PRICE PMP4000 .......8 mono mic/line + 4 stereo ch (8 XLR ins total), 2x600W @ 4ohms ......489.99 PA12CP .....................12-input, powered console, 2x 500W ...........................................999.00 PMP6000 .......12 mono mic/line + 4 stereo ch (12 XLR ins), 2x600W @ 4ohms .........
    [Show full text]
  • 3 Reasons to Record Music Without a Computer in 2018
    PRO AUDIO RECORD MUSIC WITHOUT A COMPUTER RECORD MUSIC WITHOUT A COMPUTER 3 Reasons to Record Music without a Computer in 2018 by Jaime Traba here is no doubt there is magic in recording to two-inch tape, not just in the appreciable audio quality it provides, but in having to work within how func- Ttionally limiting it can be. If you remember when tape was your only option for making music, or are fortunate enough to have gotten hands-on experience with it more recently, you know exactly what I mean. At a quick glance, aside from its audible magic (the rich harmonic content now emulated by countless plug-ins and hardware units—the endless quest for “mojo”), tracking to tape can be viewed as kind of a pain. It doesn’t use time as efficiently as a DAW (think of the time lost spent waiting for tape to rewind), needs consistent upkeep, such as biasing the machine, and most terrifying of all: there is no Command Z to undo a mistaken delete! However, I submit that these functional quirks of dealing with two-inch tape make you a stronger engineer, and can be practiced (or at least emulated) in a variety of ways to help fill your bag of tricks. I assure you, I’m no Luddite; I love the convenience and functionality of the modern DAW, and it is ultimately where I’m the most comfortable working. But getting out of our comfort zone helps us grow as creative professionals. Working within limitations expands clear up tracks for another layer.
    [Show full text]
  • Ii Ii and It's What Goes Into Hpm Speakers That Makes Them Sound Great on Every Part of the Music
    HE AUTHORITATIVE MAGAZINE ABOUT HI KILL INTERFER WITH TWO ANTENNAS ToNEAR GEomETa AND CARTRIDGE SETUP DEMYSTIFIED THE IMPORTANCE OF EAG RAI'4G £04t6 210 1N1501 0A19 lYM1N37 8097 2i g:í Nf1FI---1 NOCI o IIFI099d9f_070T00 197.0 09t£090f1 1147425II II AND IT'S WHAT GOES INTO HPM SPEAKERS THAT MAKES THEM SOUND GREAT ON EVERY PART OF THE MUSIC. H PM 100 Most speaker companies try to impress with the same materials that were being you by describing the "wonderful" sound used in 1945. that comes out of their speakers. Every woofer in the HPM series, At Pioneer, we think the most believable however, is made with a special carbon fiber way to describe how good HPM speakers blend that's allowed us to decrease the are is to tell you what went into them. weight of the cone, yet increase the strength THE HPM SUPERTWEETER: needed for clarity. So you'll hear the deepest SPEAKER TECHNOLOGY RISES TO NEW HIGHS. notes exactly the way the musician recorded In many speakers, you'll them. find that the upper end of the And because every HPM audio spectrum is reproduced woofer also has an oversized by an ordinary tweeter. magnet and long throw voice In HPM speakers, you'll coil, they can handle more find that the high frequencies power without distorting. are reproduced by a unique OTHER FEATURES YOU supertweeter. RARELY HEAROF. It works by using a The High Polymer Máiecula- Super.wee'cr. Every HPM speaker has single piece of High So incredible, we named a whole line of speakers after it.
    [Show full text]
  • The Better Sound of the Phonograph: How Come? How-To!*
    UPDATES & extras: The Better Sound of the Phonograph: How come? How-to!* ***** 5-star review – A lot of the information ***** 5-star review – This book is essential reading comes from the author's extensive life-long for anyone who wants to get the best from their vinyl - professional experience in audio as well as his own and older shellac - records. How to get better sound by research and study. I learned more about the careful setting up your system. Constructional chapters importance of stylus shape, for example, in getting the show you how to make your own equipment with minimal most out of the record grooves without distortion. The skills and basic tools. I like this book because it is well author's no-nonsense approach is refreshing in this written, easy to understand and has very useful age of fantasy thinking by hi-fi hucksters selling snake illustrations. There's also access to online updates. What oil products to innocent audiophiles. His practicality makes this book so good is that it shows how great vinyl and focus on what is really important is a valuable playback does not need thousands of dollars (or your perspective. I'm glad he shared his insights, wisdom own currency) to achieve. – Richard Z, UK and information with all of us in this nice book. – Dirk ***** 5-star review – I intend to build both Wright, USA projects in the book preamp and tonearm. All in all a ***** 5-star review – Perfect for a techno-curious very thoughtful book on the turntable and it’s music-lover, it's a profusely illustrated and readable background science; would recommend it to anyone guide, with high-end knowledge that’s harder to find with the faintest interest.
    [Show full text]