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How To Get On The SWL Bandwagon o ,,.WHITÉ'I RADIO,106 dio -TU AM=TVs STAtIONS!WORLDWIDE; SHORTWAVE LISTINGS 5' t"

. o

FEBRUARY -MARCH 751

WHY -FLEA -POWER HAMS HAVE MORE FUN

Get into the act

by building. .ros., Miniscule Module - . i_1 Heart of Mini-Mitter ,1. /f . MINI-MITTER! rí/,E . : Í : Ag fi_5 QRP is Zr

Peanut -Sized ro b. r r- .r '

Band -Switched " :; ' - !'b40. Crystal -Controlled ,I . ,! !ff! ffYu( r`', . ND ( Th1fJ1CW I :"0 AND NOW-

. 7 j A TAPELESS 4 prrC TV RECORDER!

I. COMPLETE PLANS! TWO GREAT SCOPE ACCESSORIES! ® Dual -Trace Signal Switcher Dynamic Duo Transistor Checker EICO Makes It Possible Uncompromising engineering-for value does it! You save up to 50% with Eico Kits and Wired Equipment.

A ,s. .E_ - `-- - Cortin aStereo ^' ¡ Engineering excellence, 100% capability, striking esthetics, the industry's only TOTAL PERFORMANCE STEREO at lowest cost. A Silicon Solid -State 70 Watt Stereo Amplifier for $89.95 kit, Lq wired, including cabinet. Cortina 3070. 11~11$129.95A Solid -State FM Stereo Tuner for $89.95 kit, $129.95 wired, including Cabinet. Cortina 3200. A 70 -Watt Solid -State FM Stereo Receiver for $159.95 kit, !f"rAqi{.jiiiln $239.95 wired, including cabinet. Cortina 3570.

The newest excitement in . 100% solid-state and professional. Fun to build and use. Expandable, interconnectable. Great as "jiffy" projects and as Introductions to electronics. No technical experience needed. Finest parts, pre -drilled etched printed circuit boards, step-by-step instructions. E(COCRAFT.a- Electronic Siren $4.95, Burglar Alarm $6.95, Fire Alarm $6.95, . .., Intercom $3.95, Audio Power Amplifier $4.95, Metronome $3.95, Tremolo $8.95, Light Flasher $3.95, Electronic "Mystifier" $4.95, r / Photo Cell Nite Lite $4.95, Power Supply $7.95, Code Oscillator $2.50, FM Wireless Mike / $9.95, AM Wireless Mike $9.95, Electronic VOX $7.95. FM Radio $9.95, AM Radio $7.95, Electronic Bongos $7.95.

Two years ahead! Model 7923 All Solid-State 23 -Channel 5W Transceiver. 4 exclusives: itizen's Band dual -crystal lattice filter for razor-sharp selectivity; efficient up -converter frequency synthesizer for advanced stability; precision series -mode fundamental crystals; Small: only 3'"H, 8'W, 81/4"D. $189.95 wired only. 'i The best buy in tube -type CB-"Sentinel-Pro" 23 -channel dual .., conversion 5W Transceiver $169.95 wired only. EICO Trans/ Match (Model 715) is a professional test set designed for complete checking of ham and CB equipment. Kit $34.95; Wired $49.95. Truvohm Professional Portable Multimeters by EICO. The industry's greatest v -O -M values. Automotive Designed, made to Eico's high EICO 888-Car/Boat standards of professionalism. Each Engine Analyzer. complete with batteries & test leads. For all 6V/ 12V Backed 100% by famous EICO warranty. systems; 4, 6, 8-cyl. engines. Model 100A4, 100,000(1/V, $34.95. Now you can keep Model 30A4, 30,0000/V, $19.95. your car or boat Model 30A3, 30,00001V, $15.95. engine in tip-top shape Model 20A3, 20,000(1/V, $12.95. with this solid-state, portable, self -powered universal Model 4A3, engine analyzer. Completely tests your total 40000/V, $8.95. ignition/electrical system. Model 1A1, 1000(1/V, $5.95. Complete with a Tune-up & Trouble -shooting Manual. Model 888; $44.95 kit, $69.95 wired. Equipment/Wool; I-iTestr _ 100 best buys to choose from. "The Professionals" y;.; -laboratory precision at lowest cost. FREE1968 CATALOG RTVE.2 Model 460 Wideband Direct -Coupled EICO Electronic Instrument Co., Inc. 5' Oscilloscope. DC-4.5mc 131-01 39th Ave., Flushing, N.Y. 11352 for color and B&W TV service me FREE catalog describing the full EICO and lab use. Push-pull DC vertical fiSendne of 200 best buys, and name of nearest dealer. amp input. Automatic Name syncI miter and amp. $109.95'r kit, $149.95 wired. Address Model Peak 232 -to -Peak VTVM. A must for color or B&W TV and industrial use. City 7 non -skip ranges on all 4 functions. With exclusive Uni-Probe 3 $29.95 kit, $49.95 wired. State lip .NEWS MASTER COURSE IN COLOR TV...

WITH NTS COLOR KITS :.

Big 25" Color TV kits included in new Master Color TV Home Study program. Learn Color TV; keep the new 25" color TV receiver you build with exciting kits we send you. I0 million homes in this country will have color TV by the end of 1967. This industry needs technicians as never before, and NTS-trained men can move quickly into the big money. COLOR TV'SERVICING BRINGS HIGH PROFITS New color sets need careful installation, precision tuning and skilled servicing. NTS home training can put you in this profit picture-prepare you for big pay, security, or start a business of your own.

new op- the "space age". It offers This is industrial portunities in communications, and many OFF...TO electronics, computer technology, LIFT the need others. Automation has increased Y in thou- h for skilleo electronics technicians the well AGE" of manufacturing plants. Only A"SPACE sands wants and N man makes it big. Industry trained man. the NTS . demands this kind of man ... IN Project Method 'uí. `-l CAREER Pick your field. Let an NTS a well -paid career Program help you toward travel. ELECTRONICS in Electronics wherever you NEW CAREER KIT... FAST, EASY START TO NTS HOME TRAINING The exclusive Project Method Career Kit helps you move quickl! into your training program. Earn while you learn as you progress with your shop -tested Project Method lessons and kits. ( Send fcr the New illustrated NTS Color Catalog. It shows the equipment and kits you work with and keep. Describes in detail the advantages of NTS Project Method Home Training. Tells you everything you need to know about starting your career in electronics.

APPROVED HIGH SCHOOL AT HOME NATIONAI...";.«'')SGHOOLS FOR VETERANS National offers accredited high school 40,,0S r.yue.o., Si.. I u. 4nxr,e.. eer.ro.,,,a 90011 programs. Take only subjects you need. Study at your own pace. Everything I , included at one low tuition. Check / Please rush Free Color Catalog and Sample Lesson, plus detailed special High School box in coupon for / information on field checked below. No obligation. Dept. 239-18 full information & FREE catalog. / 1:1 MASTER COURSE IN COLOR TV SERVICING 1II I COLOR TV SERVICING CLASSROOM TRAINING AT I MASTER COURSE IN TV R RADIO SERVICING You can take Classroom Training at Los Angeles in Sunny Southern . NTS occupies a city I o PRACTICAL TV & RADIO SERVICING block with over a million dollars in facilities devoted I 13 MASTER COURSE IN ELECTRONIC COMMUNICATIONS I exclusively to technical training. I FCC LICENSE COURSE flI INDUSTRIAL & COMPUTER ELECTRONICS MAIL REPLY CARD OR 1 . . COUPON FOR NEW FREE I O STEREO, HI Fl & SOUND SYSTEMS COLOR CATALOG AND / BASIC ELECTRONICS HIGH SCHOOL AT HOME ! SAMPLE LESSON. b" Name Age I I NATIONAL SCHOOLS I Address I World Wide Training Since 1905 I it State Zip 4000 S. Figueroa St., Los Angeles, Calif. 90037 Check if interested in Veteran Training under new G.I. Bill. You enroll by mail I We have no salesmen: This means lower tuition for you. % Check if irterested ONLY in Classroom Training at Los Angeles. Accredited Member National Home Study Council. Accredited II Member: National Association of Trade & Technical Schools

RADIO -TV EXPERIMENTER is published bimonthly at $4.00 per year, by Science & Mechanics Publishing Co. 505 Park Avenue, , N.Y. 10022. Second class postage paid at New York, N.Y., and at additional moiling office. copyright 1967 by Science and Mechanics Publishing Co. FEBRLTARY-MARCH, 1968 3 Radio-TV . ' February/ t J HIGH FIDEIJTY EXPERIMENTER M968

SPECIAL SECTION Editor ON QRP HAMS JULIAN M. SIENKIEWIC2 47 Peanut Whistles Spell Progress WA2CQL/KMD4313 -the lives and loves o/ flea -power hams Managing Editor 51 Build The Mini -M itter RICHARD A. FLANAGAN -your open -sesame to pipsqueak hamming K0D2566 Technical Editor SPECIAL CONSTRUCTION FEATURES W. KRAG BROTBY KQD2828 61 Dual -Trace Signal Switcher-traces by the twos Art 75 Dynamic Duo Q -Checker Editor JIM MEDLER -you use it with a scope 79 CB Rock Rater x 3 Editorial Assistant HELEN PARKER -.mil checker with the nlostest 82 Load Box Deluxe-what the test bench ordered Art Director 85 ANTHONY MACCARRONE S9er for SWLs-six-buck soup -up for SW sets 91 Mini-Jector---cheapie.signal injector in a probe Associate Art Director 94 Decibel Decimator-bye-bye to TV commercials EUGENE F. LANDINO II Cover Art Director ELECTRONICS FEATURES IRVING BERNSTEIN 65 First Full Report on CBS's Tapeless TV Recorder Art Associate 78 Mood Monitoring Electronically BARBARA GABRIEL 93 Imagineering Design Tips Advertising Manager 97 Hot Line To The Weatherman JIM CAPPELLO II 00 Lab Check-Am phenol 680 FET Voltmeter Production Director LEONARD F. PINTO COMMUNICATIONS: CB and SWL Production Manager 28 CB Rigs & Rigmarole CARL BARTEE 55 Shortwave For Non-SWLs Assistant Production Manager -getting on the bandwagon MICHELLE WOLFFS 60 CB Moonshine-oh, that hillbilly Mona Lisa Kit Division Manager 72 Propagation Forecast WILFRED M. BROWN 73 Lucky 13 For Bored DXers President and Publisher FEATURETTES B. G. DAVIS 45 Executive Vice-President What A Way To Earn A Buck-cartoon page and Assistant Publisher 64 Tiny As A Tack, Dazzling As A Dodo Bird JOEL DAVIS 59 Three Weirdos We Wonder At Vice-President and Editorial Director 96 Bigger Antenna Feeds There Aren't HERB LEAVY, KMD4529

REGULAR DEPARTMENTS RADIO -TV EXPERIMENTER, Vol: 24, No. I, is published bi.monthly by SCIENCE & MECHAN- 21 Positive Feedback ICS PUBLISHING CO., a subsidiary of Davis Publications, Inc. Editorial, business and sub- 32 Ask Me Another scription offices: 505 Park Ave., New York, N.Y. I0C22. One-year subscription 'six issues) 38 New Products -$4.00; two-year subscription. 112 issuesl- 42 Bookmark-by $7.00; and three-year subscription 118 issues) Bookworm -$10.00. Add 75c per year for postage out- 89 Ham Traffic-Picon, what's with you? side the U.S.A. and . Advertising offices: New York, 505 Park Ave., 212-PL -2. 106 Literature Library 6200; : 520 N. Michigan Ave., 312-527. 0330; Los Angeles: 1709 W. 8th St., 213-483. 3582; Atlanta: Pirnie & Brown, 3108 Piedmont WHITE'S RADIO LOG, Vol. 49, No. Rd., N.E., 404-233-6729; Long Island: Len Osten, 1-page 109 9 Gorden Street, Great Neck, N.Y., 516-487. 33051 Southwestern advertising representative: Cover by photo Leonard Heicklen Jim Wright, 4 N. Eighth Si.. St. louts, 314 - CH 1.1965.

4 RADIO -TV EXPERIMENTER SPÉCIAL-,; !WAGE . SECTION' RADIO SHACK® CATALOG '68 PREVUE

Get the one . electronics catalog that RADIO '.r.- ...... Nell ,w.., isn't "me too" e.nr.e .f'. See the very latest in CB, audio, tape reels and cartridges and cassettes, communications, PA, l radios, intercoms, antennas, electronic parts and kits, test equipment, transistors, Life- time -Guaranteed tubes, mikes, speakers, walkie talkies. See what nobody but NOBODY but Radio Shack has. See why "The Shack" is the biggest chain of its kind in the country! recgrder! ft's a tape the radio ... See ít in colorgravure - portable it's a kind of bargains shown on the next 15 pages. Exciting! New! frr. . Different! Get the book that `.i.. 05.1!-¿.'",1 ,u .+ .,,, Wl110f a..Ob h isn't "me too" today!

Just Published! FREE! USE COUPON ON PAGE 20

FEBRUARY -MARCH, 1968 5 Get Radio Shack's Holiday Special! E. with any mail or store order for any item in this special 16 -page section

ACTUAL i SIZE! FRESNEL

UnbireakableT Flexible! . 1 /32" Thick!. SLIDES INTO CASE!

Amazing new optical miracle with genuine fresnel lens! This wafer-thin magnifier measures just 37/8" x 11/4" x 1/ 32" thick and slips easily into any pocket or wallet. Though the lens itself is no thicker than a credit card, its Fresnel-principle engraved surface ,actually enlarges 4 times with good linearity. Get yours FREE today with any mail order or store purchase of any item in this ad! Offer limited to RADIO SHACK supply available, so act promptly to avoid dis- appointment. Limit: one free per customer. Fresnel Lens 4x Magnifier #64-4-44 ( ; a

).2h ti B's V ^ 09 t.°" -./.f 17. _ . ' EXTRA 4X FRESNEL e nc «a. Na.64-4441nip MAGNIFIERS EA.

Store Addresses, Order Form, See Page 20

6 RADIO -TV EXPERIMENTER RADIO SHA (K SPECIAL PURCHASE!; 44NDg.TRACK STER T:E CARTRIDGES FOR AUTO AND HOME PLAYERS / $2 TO $4 BELOW MARKET! ME ASSORTMENT! SP PRERECORDED

ATTENTION MAIL BUYERS: Space pro- hibits listing separate titles. Please specify quantity - we will send an assortment of all different titles. 95 EACH 4 -TRACK 51-1059

DEDUCT 395 $- 10% IN TRACK LOTS EACH OF 51-1058 5 OR OVER

Now you can buy full length 4 -track and 8 -track auto stereo tape cartridges for $2 to $3 less per reel than ever before! Radio Shack cleaned out a famous U.S. tape cartridge manufacturer of thousands of popular auto stereo cartridges, and we're passing the savings to you! A vast assortment of over 50 titles: shows, jazz, country, folk, pop,, western, classical. Buy now while our supply lasts! (NOTE: See recent Radio Shack catalogues for 4 and 8 -track tape players at our low, low prices!) c ? / Store Addresses, Order Form, See Page 20 FEBRUARY -MARCH, 1968 r-

"OF. B;or e o------

What's your project for ' our "Build In" radio? Here's a wired transistor radio in 3 pieces. ,. Dextrous do-it-yourselfers should have o field-day with this one. I' 'You carpenters, metal -workers and gift designers will really appreciate Radio Shack's novel "Build In" -a 6 -transistor superhet that's really a kit that isn't y a kit. Confused? Part one is the radio, 100% wired, installed in a crystalline 21/4 x 1 x 31/2" case with the tuning knob sticking out of one end, and 8 wires "BUILD -IN" RADIO out of the other. Part two is a separate volume con- trol with built-in switch, knob, and soldered leads. Part three is a 21/4" PM speaker installed in a plastic case, with soldered leads. The three parts (plus a flat 9V battery, not in- Jr,VOLUME # cluded) can be installed in, on, or under anything, in just about any desired angle or position. And CONTROL you don't have to be an engineer - Radio Shack's AND SWITCH geniuses have provided a simple, idiot -proof lashup pictorial. Now all you need is the price (just $6.98, Cat No. 12-1150) and some Yankee ingenuity! Whether you hide "Build In" in a jug of corn likker, junior's wagon or Tilliés sewing box, the result is sure to please. The basic radio itself looks like a little jewel, a real work of art - our photo doesn't do it justice. And the "kit that isn't a kit" is another of Radio Shacks's exciting exclusive products that can't be bought elsewhere. Get a "Build In" at your nearest Radio Shack store ... and start your Christmas project early! For Store Addresses, Order Form, See Page 20 PM SPEAKER IN CASE RADIO SHACK PROJECT BOOKS (4c A PROJECT)

"50 EASY TO BUILD "A MODERN TRANSISTOR ,'A MtiiiFñ:4 SOLID STATE EACH Transislor PROJECTS WORKBOOK" W, -.r._K9,OK Build your own tran- Build your own wireless BOOK `h: sistor radios, electronic microphone, AM broad- organs, amplifiers, code cast tuner, audio pre- I oscillators, megaphones, amp, PA system, experi- 5 generators, etc. Ideal for menter's power supply, hobbyists. etc. 50 schematics. 62-1050 Net 2.00 62-2025 Net 2.00 8 RADIO -TV EXPERIMENTER r!FI MIKES, SPEAKERS, HEADSETS, TOOLS 'FOR THE ELECTRONICS EXPERIMENTER PECI9b BUILD "El's" MIGHTY MINIATURE PM SPEAKERS FOR SUB -MINI SPEAKER TRANSISTOR PROJECTS, RADIOS 4" Acoustic Suspension FE -103 Speaker System/ ,4 ' 8 Ohm Impedance The fabulous Realis- tic FE-103, complete Small in size but big in sound! Three with cabinet construc- sizes to choose from: 21", 21/4", or 2". the tion details as pub- All for same bargain price! 795 40-247, lished in 21/2", Net .98 Electronics 40.246, 21/4", Illustrated! Net .98 30.17,000 40-245, 2', Net .98 cps; 15 watts; 812.

40-1197, FE-103, Wt. 5 lbs. Net 7.95 CONTOUR NETWORK KIT. With instructions. ONLY 98' EACH! 40.808, coil, capacitor, etc., Net 3.95 FABULOUS MIDGET STEREO THERMO-ELECTRIC EARPHONES HEADSET REALwORKS! For Trnnsistor Radios Separate Transducers) GLUE GUN 60 -Second Bonding Plus Instant-set Caulking! 98' 279 No Clamping! No Cleaning! - Resp. 50-9000 cps. With Makes all other kinds replaceable of earplug, cord. Perfect for use with re- t gluing obsolete! Uses unique 10 ohms. ceivers, tuners, amplifiers, hot -melt glue sticks: melted 33.175, Wt. 2 oz...... Net .98 kits and recorders! 8 ohms. glue bonds permanently in 33-174, w/3/32" plug, Net .98 33-1008, ...... Net 2.79 ' 60 seconds, providing a flexible bond chat's perfect .t. for furniture, pottery, metal, CRYSTAL LAPEL CRYSTAL MIKE leather, plastic or fabric. a Use with white sealer sticks MIKE CARTRIDGE I 4. for water proof caulking. Glue and caulking included. For Recorders, 642860, Gun, 2 Ibs..Net 5.99 d. 64-2861, PA, Paging! 99 7 Glue sticks, I lb. Net .49 64-2862, 5 7 Sealer Sticks, I lb. 89c .. Net .49 for make -or - l'r 189 mend jobs

Sensitive! Concealable! Re- Precision made crystals! spponse: 0.300 cps. Response up to 7000 cy. POWERFUL CERAMIC MAGNETS

3-100, W20t..8 oz. . Net 1.89 270-095, 8 or...... Net .89 1,000's of Home, 10c 15c 695 LAVALIER DYNAMIC MIKE Office, Auto Used 25C Each Each For Per Pair Neck/Hand/Desk Use! Singly to Pencil -slim hi -Z for use at home, studio, or in PA and guitar sys- tems! With cord, stand. 50K. 100 33.928, Ship. wt. 2 lbs...... Net 6.95 10 FOR LOW COST 25-W. OUR OWN 60/40 STEEL CATCH-ALL .I ASSORTED ELECTRIC SOLDERING IRON SOLDER STORAGE BOX HARDWARE `i) 6"H 189 Each 81/4"D xi 69c 6"Hr8f/4"Dx -' 53/4"W II 53/4"W 12 & UP t' Precision designed! Vie..,-; '-1 Comes complete with UL Cord and Each 99' Plug. Uses 1I7V 59c e+ '- Over 600 pieces! Something AC/ DC. U.S. made with superac- everyone! 64.2182, rive rosin core. Fits fed. 4 draws with adjustable here for All compartments. brand new-no sweepings! I lb... Net 1.89 specs. QQ-S-571d One full pound. 64.2178, Extra 64-2050, 3 lbs. Compar- cop- 64-0002 Net .69 Net 1.95 able value: 54.50! per Tip . Net .25 For Store Addresses, Order Forn, See Page 20 64-2890, Wt. I lb. .... Net .99 FEERU,ARY-MARCH, 1968 9 TTTHÉ1tÉÉCTÑk PROJECTS HAVE EARNED

CASH AWARDS FOR RADIO S SHACK. CUSTOMERS Build Yourself - or , Win Cash by Sending Us Yoúr Own Ideas! W. R. SQUARE WAVE GENERATOR' , California Check Out the Frequency Response of Hi -Fi Amplifiers -- Tape Recorders- Preamplifiers

PROJECT PARTS LIST RI OUTPUT Stock No. Item Net C3 v 23-464 9V Rectangular Battery .29 71-5194 .01 mfd Capacitors (CI, C2) .18 02 71-0409 .1 mfd Capacitor (C3) .22 276-1709 1N34 Germanium diode (D1) .27 276-401 PNP Transistor (01, Q2) .99 70-0195 3.3 K Resistor (R1, R3, R4) .12 70-0195 6.8 K Resistor (R2, R5) .12 271-1716 50 K Potentiometer R6 (R6) .59 R2 275-602 SPST Toggle Switch .30 FREQUENCY 270-325 Set of 5 battery connectors .69 CONTROL 276-1390 Prepunch breadboards, 41/2 x 55/8" .55 270-1395 Solderless terminals, (set of 5) .99 Use this square wave generator, together with an oscilloscope, to analyze the frequency characteristics of any audio amplifier. The unit is adjustable over a broad range of audio frequencies.

F.R.F. ELIMINATOR/CHARGER Chatsworth. H.S. . California Use Either in Place of a 9 -Volt Battery or to Charge.Batteries to Full Power: Save $$$!

PROJECT PARTS LIST SI Stock No. Item Net 270-325 9 volt battery connectors (kit of 5) .69 273-050 6.3V ea 1.2A Filament Transformer 1.19 274-687 Terminal strips (kit of 5) .40 110 276-1135 Rectifier epoxy (kit VAC of 2) .29 275-602 SPST Switch .30 272-986 Capacitor 500 µf (1) .72 70-0195 10 Kll 1/2W Resistor (1) .12 TI 278-1253 6 Ft. Line cord (1) .39 276-1390 Prepunched breadboard (1) .55 275-602 SPST Toggle Switch .30 Now you can run electronic kits and experiments that use 9V DC power without buying new batteries! Simply plug into any 117 VAC outlet; delivers up to 250 ma. at 9 VDC,

$$, FOR YOUR ELECTRONIC IDEAS! -Turn Ingenuity and Hobby into Spare -Time Profits!.

We are looking for experiments built around Radio Shack or other electronic parts. These will he published regularly in our catalogs. If published by us WE WILL PAY YOU AN AUTHOR'S FEE and reimburse you for parts bought from us-maximum S50 cost. By submitting it, you state it's original with you. If we accept it, it ís understood we can publish it for use by our catalog, flyer, book and magazine readers. Submissions cannot he returned. Send description, parts list, stock numbers, and schematic. DO NOT SEND ACTUAL SAMPLE as we will build it here to see if and how it works. Write today! SEND TO: Radio Shack, Attn: Lewis Kornfeld, Vice -President 730 Commonwealth Avenue, , Mass. 02215

10 RADIO -TV EXPERIMENTER RADIO SHACK EXCLUSIVE! ADD A

YWOAIILIIK SLAVE "WALKIE" R TALK ES!ILE, Actual Crystal -controlled superhet ONLY receiver ONLY! Add as Size" many ears to your network as _. . 795 you want. Fits in a shirt pocket .. - an excellent paging V i,..,.,...:=___..ne;, '7i, or guided four device!

1 " n This unusual Radio Shack product, called the Realistic .4:- 1 T. Microsonic 27MC Receiver, comes complete with a Ch. 11 CB crystal - and because it's a plug-in, it can be changed to any of the 23 channels. It's a teeny 31/2 x 21/2 x 1 3/g". It includes an earphone with clip, and the phone's lead acts as the antenna. So if you want to hide it away as a pager, there's nothing showing. For DX we've included a 16" telescopic whip to be used only if necessary. Let your imagination run wild with this novel device! 21.109 Microsonic 27MC Receiver Only 7.95 NEW IDEA #2 - as a companion to the above, or a wire- less CB microphone (!), there's also the Realistic Micro - sonic CB transmitter. Same size, color, everything. But transmit only, 100mw of course, with plug-in crystal for Ch. 11. Uses? For example: one of these plus x -number of receivers and you have a guided tour technique that'll never l quit! 21-110 Microsonic CB Transmitter Only 7.95

C FREE ACCESSORIES: ., and whip antenna 1LER Receiver - earphone r :9,E_ E Transmitter - 35" telescopic antenna Note: both units include crystals but require a 9V transistor battery to operate. 23-464, 291: each.

RADIO SHACK'S ° FABULOUS SPACE PATROL®. TWOSOME -ARC F1ER-+ STANDARD "ARCJ1ER- MICRO FULL SIZE SPACE PATROL® SPACE PATROL°

Double transformer talk - Talk up to y, mile world's small- with our perennial fa- power in the est (3-5/6 x 2-7/16 x vorite in the 100MW -14 MIO easily in 1 case. Fits no-license class. Over - 1/4")s trans- your shirt pocket (and your 100,000 of these MtCRO Handsomely styled ceivers now in use! budget). talk switch srwea rwTROL_ hi -impact, custom -chromed "Lock -on" to operate with for continuous trans- case. Easy a hideaway "push -to-talk" mission when needed. telescop- tele- button. 9 -section Extra -long 43" ing antenna. With channel scopic antenna! Chan- 14 crystal and battery. nel 14 crystal & battery I included. l 4 /7

Q f' 1495 .4*0'vl+t PER PAIR PER PAIR - - For Store Addresses, Order Form, See Page 20 11 FEBRUARY -MARCH, 1968 CB'ers MOBILE Lists® TRANSCEIVERS! 23 -CHANNEL CRYSTAL -CONTROLLED TRANSCEIVER

AllSUPPLIED!CRYSDTA[S i r{ 3995 SOLIO STArE 11, ALLOW tµ 18 Transistors; ' 4 Diodes! Y f P ..=. G Or-. Antenna - - Change ,, á // cistsc ' Over Relay! - N 6 r.2-º. Low Battery Drain! Synthesizer Circuitry! ONLY 6"x7"x1-3/4" Illuminated "S" Meter Obsoletes all other 23 -channel crystal -controlled transceivers! High -efficiency - up to 3.5 watts output with 5 watts input. Dual conversion, with 10.62 Mhz and 455 & Channél Selector! Khz IF's for sharp selectivity. Sensitivity: 0.25 µv at 10 db S/N. Adjustable squelch control and automatic series gate noise limiter. 12 VDC neg. ground. Plug-in Wood Grain & ceramic mike and retractable coil cord, fumble DC power cable, bracket, instruc- tionsand hardware. Chrome Front Panel! 21-124, TRC-24, Ship. Wt. 6 lbs. Net 139.95 EAL/St7C2 12 CHANNEL CB TRANSCEIVER Single Crystal Operation for Receive and Transmit

tl; -~tisriL 9995 TttC e' BIL ICON ,SOUO BTATE CB TNANSCEIVEN Solid State Circuitry! Dual Conversion 6.2 MHZ and 455 for Greater . p.A F Of Sensitivity & Selectivity! B-NF spur LCN ' to CHANNELS VOLUMt. Mechanical 455 KC Filter! Push -to -talk Dynamic Mike! A truly versatile communications package. Incorporates ad- vehicle. Adjustable squelch control; automatic noise limiter; vanced frequency synthesis technique used on higher priced illuminated channel selector and meter. Sensitivity: 0.5 µv models, the TRC-l8 transmits and receives with. only one for 10 db S+S/N. With cords, brackets, crystal for channel crystal per channel. Up to 3 -watts output with a full 5 watts 11.71"x63 "x2w' of RF input. Low battery drain in any 12 VDC neg. ground 21-120, Ship. Wt. 8 lbs. Net 99.95 -~ALisr7c= SOLID STATE MOBILE 2 -WAY RADIO 8 -Crystal Controlled 95 Channels! All Silicon Transistors!

Economy priced. Model TRC-14 features full 5 -watts in- put, adjustable squelch control and advanced electronic an- tenna switching. Sensitivity: 1 µv for 10 db SN/N. 12 VDC neg. ground. Set of crystals for channel 11, push -to- talk ceramic mike, mounting bracket, DC cable and instruc- tions. 81 x x 21". 21-032, Ship. Wt. 5 lbs. Net 79.95 TRC-15 - Same as above but for 12 channel operation, illuminated channel selector, die cast panel, extruded trim and coil cable push -to -talk. 21-033, Wt. 5 lbs. Net 89.95

12 RADIO -TV EXPERIMENTER EASY -TO -USE -£-71~4~1 TEST EQUIPMENT!

1,000 OHMS/VOLT MULTITESTER 20,000 OHMS/VOLT MULTITESTER

.e 95 95 Factory Factory Wired Wired r P 14 ° }¿ t Y \ d

Q Convenient Thumb -Set w, 28 -Ranges! Mil Zero Adjustment! y/ A w6 Mirrored 2 -Color Scale! .' 11,Q Reads AC/DC Volts in 3 ., O. tie o 150, 1000! Ranges: 0-5, < Jewelled Movement! Q " áa Only 3t/2x21/ex1"! Only 35/e r 5-3/16 x 11/4"1

Great for home or workshop! Pin jacks for all 5 Single -knob range selector with separate ohms ad- ranges; 2 -color 13/4" meter scale. DC Current 0-150 justment. Spec.: DC Volts 0-3/15/60/300/600/ ma. Resistance: 0-100,000 ohms. Accuracy is ±3% 1200 @ 20,000 ohms/volt. AC Volts 0-6/30/120/ of full scale value on DC ranges, ±4% of full 600/1200 @ 10,000 ohms/volt. DC Current 0-60µ, scale on AC ranges. A rugged black bakelite case. a/3 ma, 30 ma, 300 ma. Resistance range 0-12K, Comes with pair of color -coded test leads, instruc- 120K, 1.2 meg and 12 meg (at center scale 60, 600, tions, battery. 6K & 60K). Decibels: -20 to+63 db (5 ranges). 2 Net 14.95 22-4027, Ship. Wt. I Ib. Net 5.95 22022, Ship. Wt. lbs.

50,000 OHMS/VOLT MULTITESTER Arra 61/2r" VTVM METER

I SF 795Factory Factory -. 3995Wired Wired

4" Full View Meter with Precision Resistors! Mirrored Scale! op Measures Peak -to -Peak Meter Protection Circuit! " and RMS (7 Ranges on 1% Precision Resistors! Each Function)! Frequency Response: x ( :;_. : 26 -Ranges! P _.- 30 cps to 10 mcl

Only 7a51/2a5%"! Easy -to -Read 2-Color Full View Mirrored Scale!

Great for technicians, mechanics and hobbyists. Specs: DC volts: 0-0.5-2.5-10-50-250-500-1000V Features a zero -center scale for alignment of FM - [50,000 0/volts. AC volts: 0-2.5-10-50-250- TV detector circuits. Specs: AC volts: RMS 0.1 to 1000V @ 12,500 (1/volts. DC current: 0-25ma- 1500 V. (7 ranges); DC volts: 0.1 to 1500 V. (7 2.5ma-250ma-1 amp -10 amps. DC Resistance: 0- ranges). Peak -to -peak 4-4000 V. (7 ranges). Out- 10,000/100,000/1 meg./ 10 meg-ohms. Center put -20 db to +65 db (7 ranges). Resistance: scale: 90/90'3/9000/900,000 ohms. Decibels: -20 0.211 to 1000 meg-ohms (7 ranges). Tubes: 12AU7, to +62 (5 Ranges). 6AC5 and SR1A. Power: 117 VAC, 50/60 cycles. Net 39.95 22-I50, Ship. Wt. 51/4 lbs. Net 27.95 22.025, Ship. Wt. 7 lbs.

FEBRUARY -MARCH, 1968 13 EXCITING ELECTRONIC .PARTS.bVALUES a 10 Germanium Diodes JUMPER LEAD CLIPS 5" VERNIER DIAL Similor fo 1N34, 1N34A, 1N60 99, Set of 10

Equivalent in use to silicon diodes with Ten 14" jumper lead wires with mini- lower forward voltage drop. ature alligator clips on each end. Leads are color coded for testing! 276-821, Wt. 1/4 Ib. Net .99 278 1156, Ship. Wt. 6 oz. ... .99 Variable Loopstick JUMBO 100 PC. 6:1 Drive Ratio! Antenna Kit t RESISTOR PAK 399 5 Blank Scales! C Kit of 3 19 Large face is ideal for test equipment, `L calibration, etc. 0-180 logging scale. 3 -Pc pack for general re- Hairline pointer 3/4" dial shaft in placement in small radios. rear can be coupled with another Variable core nines to 365 50 carbons, 30 precisions 20 power shaft. Plastic see-through window, mmf tuning condenser Tapped 6`E a resistors. Popular 1, 2 5, plus large easy -to -grip knob. for transistor applications. values., 3, 7, 10 watt sizes. Some 1% Rt 5ió incl. 274-388, Ship. Wt. I lb. Net 3.99 270-376 Net .99. 271-302, Ship. Wt. 2 lbs. Net 2.19 STANDARD 1/4" INSULATED CLIP SET 1'' MATCHED KNOB KIT PHONE PLUG

Set

Kit of 4 ,, w 99c 99, of 14 ` t Black knurled knobs w/polished Plugsinto standard r/4 With rubber insulators inch phone - 7 black, 7 aluminum inlay. Brass jack. Screw terminal connections. red. Solder type Length 1.5/8:- inserts for shaft. Set screw. 1 x 274-1536, Wt. 4 or. Net .99 270.1545, Ship. set. 4 ox. .99 3" 5/4". Net 274.1552, Ship. Wt. 4 ox..... Net .99

500' HOOK UP WIRE MINIATURE LAMP 1/2 Ib. Jumbo Pack ASSEMBLIES of Disc Capacitors 298 -$10 Kit of Per Pak Mammoth bargain. 5.100 ft. coils in popular colors. thru r..J1` Sizes # 18 # 22, Complete OVER249¡' 300 ' ,'n suitable for most wiring jobs. 'with miniature 6V bulbs. PIECES! All pop- Contains 2 Stranded and solid types. red and 2 green jewels. ular values and voltages. Most are Mounts in 5/16" hole. . 278-1484, Sh. wt. 2 lbs...... Net 2.98 marked with capacity and voltages. 272-344, Ship. Wt. 1/4 Ib. Net .99 272-987, Ship. Wt. Vs lb...... Net 2,49 60 -PC. TRANSISTOR SCREW TERMINAL KIT NEON PILOT LIGHTS SURPRISE PAK

298. r R 99° of 3Kif 99' 0.9111 '+ ,.a n 4l Built-in neon lamps. Jewel Kit of 13 Pc. Includes NPN's, PNP's, 10W, 20W front; 2 red, 1 yellow. For 117 VAC use. With 3 drop- and 50W transistors, as well as sub- ping miniature types, 60 in all! 13/4 23, and 23/" lengths, by se" H. resistors. 276.034, Sh. wf. 2 lbs. Net 2.98 274-3345, Ship. Wt. 1/4 lb. Net .99 272.338, 1/4 Ib. Net .99 MINIATURE PUSHBUTTON 3 CIRCUIT PLUG & JACK Infra -Red Detector SPST SWITCHES Transducer Kit

C Set - _ of r^ 2 99 99 d. 198 Pkg of 5 t Set of two 3circuie Va " phone plugs. Momentary pushbutton switches. Nor- jacks. Black bakeljte handle. Solder lug mally open circuit. Solder lug termi- terminals. Open circuit jack complete nals. Panel Red button and with mounting hardware. Parabolic reflector, 3" filter, and de. mounting, tector complete with pictorial diagram. black phenolic housing. 2 x Va. 274-323, Ship. wt. 1/4 lb. Net .99 Wonderful 275-1547, Shin. wt. tj4 lb. Net .99 experimenters kit! 276-035, Ship. Wt. 5/2 lb. Net 1.98

14 RADIO -TV EXPERIMENTER Yi

SEMÍ -`CONDUCTORS FOR . ;T HE HOBBYIST Silicon Field -Effect 1111 -..ARCHER.-00 - Replacement Transistors Transistors

PNP TYPES Epoxy high gain. Re- 198 ppSilicon N940 -2N946, For high frequency, RF-IF, and 2N2333.2N2337, converter circuits. Replaces: 2N3550. High Impedance Input! 2N247. 2N248, 2N252, 276-420, Wt. 3 ox. .... Net 1.09 2N267, 2N274, 2N308. Low Noise! High Gain! 2N309, 2N310. Silicon Epoxy nedium gain. Characteristics Similar 1.29 2N1132, 2N923 - 276-412, Wt. 3 os...... Replaces: to Pentode Vacuum converter 2N928, 2N2372, 2N859. For mixer/oscillator Tube/ circuits. Replaces: 2N112, 2N865. 276.421, Wt. 3 os. Net .99 2N113 2N114, 2N135, 1000's of applications where pentode 2N136, 2N137, 2N140, tubes are used in low level circuits: 2N175, etc. field strength meters, "gate dippers," 276.401, Wt. 3 or. .99 NPN TYPES receivers, flea power , etc. For universal IF circuits. Re. For mixer/oscillator converter TO -5 case. Includes specifications. places: 2N111, 2N112, circuits. Replaces: 2N193, 276-664, Sh. wt. 2 oz ...... Net 1.98 2N139, 2N218, 2N219, 2N194/A, 2N211, 2N2-12, 2N315, 2N366, 2N406, 2N233, 2N254, 2N357, etc. 2N358. 276-402, Wt. 3 oz. .99 276-408, Wt. 3 oz. 1.09 IBM Component For 6 volt audio circuits Re- 2N104, For universal IF amplifier cir- Boards places: 2N77, cuits. Replaces: 2N98, 2N99. '2N105, 2N107. 2N109, 2N100, 2N115, 2N146, 2N130, 2N131. 2N148. 2N149, etc. 276-403, Wt. 3 or. .99 2N147, 276-409, Wt. 3 or. 1.15 For 12' volt audio circuits Re- f i 29` places: 2N36, 2N37, :N38, For 9 volt AF amplifier cir- ,'!Íl Jtir 2N41, 2N43, 2N44, 2N45, cuits. Replaces: 2N35. SAVE! 2N46. etc. 2N169A, 2N213, 2N214. 276-404, Wt. 3 oz...... 99 2N228, 2N306, 2N312, I 4-1t Re- 2N313. etc. 4 for 1.00 For 9 volt audio circuits. .99 places: 2N188, 2N189, 276.410, Wt. 3 ox. 2N190, 2N191, 2N192, For 12 volt AF amplifier cir- All quality American made parts. 2N195, 2N196, 2N197, cuits. Replaces: 2N306A, Each board contains at least two etc. - 2N445Á, 2N446A, 2N447A, transistors, plus loads of other com- 3 .99 coils. . 276.405, Wt. oz. 2N556, 2N557, ' 2N587, ponents: resistors, capacitors, diodes, modules, chokes, and heat .11; Pot' auto -radio AF amplifier 2N649, etc. circuits. Replaces: 2N176, 276-411, Wt. 3 oz. .99 sinks. Size: 236 x 3%a". 2N178, 2N179, 2N234, 276.616, Sh. wt. t/. lb. Net .29 2N236, Silicon Epoxy nigh gain. Re- 2N235, , 2N35B, places: 2N3704 -2N3709 2N242. etc. 2N3415 -2N3417, 2N3877. 276-406, Wt. 3 oz...... 1.19 276-422, Wt. 3 at. ... Net 1.09 - For high power AP circuits in 3 Amp Silicon auto radios. Replaces: 2N173, Silicon Epoxy Medium gain. 2N174, 2N277, 2N278, Replaces: 2N706TPP, Controlled Rectifiers 2N441, 2N442, 2N443. 2N3663, 2N3E43A, 2N3900, 2N1515, etc. 2N3901, etc. 195 3 ox...... Net .99 276.407, Wt. 3 oz. 2.29 276-423, Wt. *¡ - TO -66 Case! 200V Designed to deliver loads up to 31 Integrated Circuit Specials! amps. Ideal for use in speed control operation, power converters. 276-1065 ...... Net 1.95 Ideal for the Hobbyist, 276-1066, 10.66 mtq. hdwr. .30 Builder, Experimenter! 198 100 -Pc. Jumbo Pak Up Fantastic Savings! Transistors Actual Size Assorted

New from Radio Shack! Resistor -Transistor Logic type ICs are ideal for builders. 398 hobbyists, labs, industry etc. Guaranteed to be 100% perfect electronically and mechanically. Each comes complete with diagram and lead locations. Power re- quirements: 3 volts. Flat Pak type. Size 3/4 x 5/16 x 1/16".

up Includes DUAL 3 INPUT GATE. Can be used as a 6 input microphone mixer. Contains to increase & Planars to 6 transistors 9c 8 resistors in pak. Elements can be used parallel Silicon current capabilities. Net 1.98 276-430, Wt. 3 oz. NPN & PNP in TO -S case; power & IF own binary computers, digital adding transistors, too! Ideal in RF DUAL 3K FLIP-FLOP. Construct your driver, output, switching, general machines, etc. Contains up to 26 transistors & 50 resistors per pak. Net 2.49 audio purposes. 276-431, Wt. 3 oz. 276-544, Sh. wt. I lb. Net 3.98

15 FEBRUARY -MARCH, 1968 TM ~wet' Ingenious New Radio IN Shack PERFBOX 'i"rofessiona/izes" Project Building! BIRTHDAY The bloody -knuckle brigade will appreciate Radio Shack's effort to eliminate chassis /Min cutting and drilling, and make things prettier!

Somebody at "The'Shack"-thank heaven! - must hate metal chassis and the gener- ally sloppy look of breadboard projects. Now they've come up with a bakelite chassis box into which they've installed (4 screws) a 311" x 6" perfboard top. But that's not all - the back of the box is pre -drilled for a 21/4" or other PM speaker, .er and there's a pre -drilled 1/4" out- let hole on one side! This much -needed e. item is called the Radio Shack Experi- menter's PERFBOX". (Cat. No. 270-097, price $1.69) and should sell like film at 'i Expo 67. As an added fillip; there's a com- BACK panion deal they call Radio Shack Experi- menter's 5 -Piece Panel Set, consisting of 3 perfboards and 1 aluminum and 1 bakelite panel board, all 31/4"x6" predrilled to fit the PERFBOX". The latter two boards are un-perfed (to coin a word), and the 5 -piece set (Cat. No. . fY 270-100, price $1.69) should answer just about any need for extending the usefulness of the PERFBOX short of filling it with champagne! .062" HOLES

RECOMMENDED PARTS- FOR USE IN PERFBOX: PROJÉCTS

DESIGN, CONSTRUCT YOUR OWN CIRCUITS . using these time -saving phenolic boards, breadboard or PUSH -IN TERMINAL KIT 3/32" holes permanent type. punched on 0.265" centers. Can be sawed. Shipping weight I Ib. Use with prepunched pert boards. .062 diam- 149 eter holes (1/16"). Ser- rated slots. Easy multi- ,UNCLAD PERF-BOARD Kit of ple connections. 100 270-1394, 1/4 lb. Net 1.49 Accepts Miniature Components! Easy -In, Easy -Out Mounting! Ideal for Modular Construction! SPRING BANANA PLUGS 276-1582, 3.65:6.87:1/I'6" Punched Net .59 Ideal 276-1583, 6.8719.8:1/16" Net 1.15 for 3/32" hole per- forated boards. Overall 99 length I". COPPER -CLAD SOLID BOARD Set of 10 270-1543, 2 or..... Net 994 Make Your Own Printed Circuits! Quality -Manufactured Board SOLDERLESS TERMINALS Bonded with Copper! Use with .093 diameter holes. Takes up to 7 276.1586, 3.65 leads without (Unpunched) x 6.87 x he" Net .79 99C soldering. 276-1587, 6.87 x 9.8 x X,' USA made. Spring ac- Nºt 1.50 tion. Set of 15 270-1395, 4 or..... Net 990 COPPER -CLAD PERF-BOARD For Printed Circuit Design ALLIGATOR CLIP SET and Circuit Checkout! Easily Etched and Worked! 10 brass plated l.4" Ion); with insulated phe / 276.1584, 3.6516.87x1!!6" Net. .89 noise barrels. Strong 276-1585, 99' 6.8719.8x1/16" Net 1.75 spring. 5 red, 5 black. (Punched) 270-1540, 2 ox..... Net 990 For Store Addresses, Order Form, See Page 20 16 RADIO -TV EXPERIMENTER , e t1a33 - i ANY Cerebrating ir ,++ . os> AHER-PAKO fit. - . a t N , PER . ,- , r . THIS PAK PAGE Anniversary

20 Power Resistors 35 Precision 1% Resistors 50 Tubular Capacitors

Package consists of high - Large assortment of pop- An assortment of quality quality vitreous, cand-ohm ular 1/2, 1 and 2 -watt tubular capacitors, 100 and wire -wound types. In values; includes encapsu- mmf to .1 mf to 600 eludes 5 to 25 -watt lated, bobbin, carbon WVDC. Includes molded, power resistors; individual film, etc. Made by Arro- paper and porcelain catalog net - s 10! vox, Shellt:ross, IRC, and types. 510 if purchased 271-1202, 2 Iba...... Net 1.00 other famous names. individually from catalog! 272-1568, I lb. Net 1.00 271-1196, 1 Ib. Net 1.00

4 Subminiature 455KC 8 Sets -RCA Plugs 8. Jacks 35 Miniature Resistors IF Transformers World's smallest 1/4 -watt Quality items, ideal for carbon type resistors! All 'web use in phono amplifiers, have axial leads; built for Slug tuned, made for tuners, recorders, etc. transistor and subminia- printed circuitry mtg., Take advantage of this ture circuitry: Assorted shielded. Size: Hi x /s Radio Shack Special low values, with resistor color 1 price! code chart. Net 1.00 273-515, 1/4 lb..... Net 1.00 274-1575, t/4lb. '1 271-1566, 1/r lb. Net 1.00

40 Coils and Chokes 45 Mica Capacitors 8 Volume Controls Famous name micas - Most Popular Values Shop assortment consist- Aerovox, Sangamo, C.D., ing of RF, OSC, IF, para etc. This assortment in Contains 8 assorted values sitic, peaking and many eludes popular values 100 including long and short more types. Individually shaft types. A tremen- would .mmf to..01 mf, as well purchased, this cost as silver type dous bargain for service- you SIS! condensers. ?s A $ 10 catalog net value! men! 41-el 273-1569,1 lb. Net 1.00 271-127, I Net 1.00 272-1573, I Ib.i Net 1.00 Ib...... Special! 50 Capacitors 60 Half -Watt Resistors 50 Ceramic Capacitors Assortment of many types Made by Allen Bradley Wide variety of popular including disc, ceramic, and IRC. Many 5% and values by Centralab and mylar, temperature coeffi- 10% tolerance. Color other famous -name mak- cient, molded, paper, oil, chart. All most popular ers. 10 mmf to .04 mf to Vit-Q. You save 59 over values. An absolute KV. Assortment includes industrial net catalog "must" for hobbyists and tubulars, discs, NPO's, prices! kit -builders. 1 temp. coefficient, etc. Net 1.00 I lb...... Net 1.00 272.1199, I lb...... NO 1.00 271-1612, I lb. 272.1566, 48 Terminal Strips 35 Disc Type Capacitors 150' of Hook -Up Wire

You get a wide variety of A varied assortment of screw and solder lug type Assortment consists of 6 types, including NPO's, V rolls of 25' each terminal strips with 1 to - -750's, and value Ht -Q, N mylar solid and stranded wire. 6 lugs. Outstanding ceramic. 10 mmf to .01 at this low price! 101 #18 through áj22. Nec- mf to 6 Kv. A 510 cat- essary for multitude of uses for the builder and value! experimenter. alog net jobs and always useful! 272-1567, Nat 1.00 Net 1.00 1.00 1/4 1h. ' 278-025, 1/2 lb. :`. 274.1555, I Ib. Nt 40 One -Watt Resistors 4 Transistor Transformers $ , ' SURPRISE Here are resistors for hundreds of uses! Assort- ,v.iiie., Made by UTC and Rem-Rem - PACKAGE! ington Rand. Famous min 25: ment has Allen Bradley and IRC carbons, with ',1111 iatures. Includes sub 5% values included. This ouncer, mike, input types. leads. Loaded with $ pack is a regular 58.00 Color coded .... 'Net 1.00 !1 catalog net! 273-1581, I lb.. Parts! 271-1576, I lb. Nt 1.00 The biggest surprise package yet! Enough 50 Plugs and Sockets 30 2 -Watt Resistors electronics compo- Ideal bench assortment nents to make your for servicemen, hams, etc. These quality 2 -watt re- eyes pop! Resistors, y Subminiature and printed sistors are non -inductive, capacitors, condensers, circuit types included! magnetic film, carbon diodes ... your guess *5.s This assortment saves you types. Many with 5% is es good as ours. Tile - famousmakr parts are "' S 10 over individual cat- values. Made by famous name manufacturers. worth at least 525.00! alog prices! 4 1.00 270-1251, I lb., Net 1.00 '274 1562, I lb. Net 1.00 271.1211, Vs lb. .... Net For Store Addresses, Order Form, See Page 20 FEBRUARY -MARCH, 1968 17 BRILLIANT NEW KIT LINE! r o Science FaIPTM Perf-board electronic projects make soldering a s. optional, let builder re -use O1E 111. PR _ - parts or change circuit! ELEO R At last! - electronic kits that let you work the same way engineers do - by -bread- 'tED boarding". Designed by Radio Shack's en- - RyOPER gineers and produced by its new Science cTRONIC Fair Electronics division, the kit line fea- tures step -numbered construction data, pic- torial, schematic and add-on instructions. AC/ DC "OTL" AUDIO CAN KR _y'` POWER AMPLIFIER SUPPLY KIT KIT

95 NO. 28-104 95 NO. Converts 117 VAC 28-106 (house current) to No1 either 6 or 9 volts Ideal for use with DC. Play battery op- tuners, mikes, phono- erated equipment on graph systems. OTL house line! Also ideal output. Frequency re- for use with Science sponse up to 15,000 Fair" kits & other cycles. Rated up to 2 projects. watts peak. For Store Addresses, Order Form, See Page f I' 20

TRANSISTOR TRANSISTOR WIRELESS AM 1 -TUBE DC RADIO KIT ORGAN KIT MIKE KIT RADIO KIT

395 N3. NO. 395 NO. NO. 28-102 595 28-101 28-103 395 28-100 Each not on the sev- Battery -operated! Tunes the standard en -note scale is sep- Transmit through any Learn tube theory and AM broadcast band; arately tone variable. radio up to 20 feet build a real working can also be used as Unit is battery -oper- away! Battery -oper- radio. Equipped with a tuner. Battery -oper- ated and features ated microphone is a sturdy perf-board con- ated. Comes complete perf-board construc- real broadcaster! Con- struction. Kit comes with earphone. Perf- tion. Fun to build & structed of sturdy complete with ear- board construction. operate! pert -board. phone.

18 RADIO -TV EXPERIMENTER

ORDER BY _MAIL FROM; YOUR NEAREST RADIO' SHACK STORE ARIZONA : 309 So: Hills Village Cn. Phoenix: 3905 East Thomo. Rd. Nicollet 1121 Ave. Eon Hills Shop. Cr,. 140 Apo ha pima Plymouth Meeting: Plyrneuth Meeting Moil Little RorAt University Plaza Hab Shopping Crr. St. Pool: 471 No. Snelling Ave. CALIFORNIA Providence: 355 Reservoir Are. Anaheim: 507 Rost (Mello Ave. East Providence: Shoppers' Town Bakersfield: Volley Square Shop. Clr. Jackson; 3017 North Stale St. Covina: 1065 West Bodille MISSOURI Memphis: Downey: Stanwood Shopping Center K City: Grove: 1208 Southland Mall, Whitehoven Garden 9836 Gorden Grove Blvd. 1234 Grand Ave. Glendale: Broadway 6 96 North Avalon Chevy Chose Dr. Antioch Shop. Ctr. Easrgote Inglewood: 4736 West Century Blvd. Shopping Or. St. Joseph: East Hills Shop. Ctr, Frays.r Plaza Shop. Or. La Habra: 1511 West Whittier Blvd. St. Louis: Leoch: 1825 South 3rd St. Long 4684 Long Leach Blvd. 1125 Pine St. (Walter Los Angeles: Ashe Dir.) Noseville: 100 Oaks Shop. Or. South County Shopping Center 830 W. Olympic Blvd. Northland Shopping Lode., Shop. Ctr., 5305 Center Abilene: 2910 North First St. Centinela Are. 10483 St. Charles Rock Rd., St. Ann Mission Hill., 109:9 Sepulveda Blvd. Arlington: Collins or Park Row Reseda, 19389 Victory at Tampa NEBRASKA Aostin: Hancock Shopping Center Wen L.A. 10650 W. Pico blvd. at Overland Omaha: 3002 Sledge St. Brownsville 847 S.E. Elizabeth St. Mountain Vlew: San Antonio Shop. Crr. Corpus Christi: 520 Everhart Rd. No. Hollywood: Loarel Plaza Shop. Cn. Manchesf.t: 1247 Elm St. Dallas: Oakland (Son Leandro): Bay Fair Shop. Ctr. NEW Medallion Center JERSEY 125 Pasadena: 1715 East Colorado Bled. P ennsaukent Rt. 130 Wynnewood Village Pomona: and%rowning Rd. Plymouth Pork Shop. Ctr. 1335 Holt Ave. Trenton: 1+61 Hamilton Are. Sacramento: 600 Fulton Ave. 138 Marsh lone Flour Son Bernardino: North NEW MEXICO 156 Inwood Village D St. Albugaergae: San Bruno: 481 El Camino Real 507 Cosa Linda Plato San Diego: G.ossmont Shopping Centel 6315 Lomos Blvd., N.E. 1424 South Buckner Blvd. M,t,ion Volley Cn. West 4th and Copper N.W. El Paso: 85 Baum, Center College Grove Shop. Or. NEW YORK Forth Worth: San Francisco: 36 Geary Street Albany: Colonic Shop. Ct., Colon'. 3524 Denton Highway Santo Ano: Binghampront Vestal Shopping Plaza 2615 West 7th St. Bristol Plato Shop. Ctr. Buffalo: 6303 Comp Bowie Blvd. 2713 South Main St. 725 Main Street 138 Seminary South Sonia Monica: 732 Santo Monica Blvd. Transitown Crr. (Williamsville) Houston: Torronce: 22519 Hawthorne Blvd. New York: 1128 Ave. of the Americas 7949 Katy Freawoy West Covina, 2516 East Workman Are. Schenectady: Shoporama Cl,., Rotterdorn 8485 Gulf Freeway syroruse: 322 Norlhlin COLORADO Mall Bellaire, 47599 D 3057 Erie Blvd. East Bissonnet 9417 Jensen Rd. 798 rSouth Santo Fe Dr. Fairmount Fair Ctr., 3675 W. G Sr. Westland 1407 Spencer Hew. (So. Houston) Shopping Center Lubbock: B-10 2186 So. Colorado Bled. Charlotte: 1010 Central Ave. Caprock Shop. Ctr. Volley Mdland: South "9' Meta Drive North Shop. Ctr. San Antonio: : 740 Swiflon Ctr. : 150 Wonderland Shop. Ctr. Bridgeport: Lafayette Plato 684 S.W. Military Drove Southgate Ctr. (Maple Hts.) Village Hamden: Hamden Mart Shopping Center Shops 71071/, Son Pedro Highway 75 North Manchester. Moneh Shopping Richmond Mall (Richmond t..) Patkad. time: Lima Mall Sharman: 1620 Highway 75 North New Britain: Newbrite Plaza Tyler, 108 Stoup Hgwy. Willowick: Shoregate Shop. Ctr. . New Haven, 230 Crown St. Waco: K -Mon Shop. Crr. New London: New London Shop. Or. OKLAHOMA Orange Oklohoma City: UTAH Whiteacre Shop. Ctr. Salt Lobe City: Cottonwood Moll Standard, 29 High Ridge Rd. Mayfair Shop. Cfr. Torrington: Torrington Parkode Hiller ., Shop. Ctr. VIRGINIA West Hanford: 39 So. Main St. lalsa: 2730 South Harvard Arlington: Porrington Shop. Cl,. Hampton: Mercury Plaza Jacksonville: Norfolk: 4016 Granby St. Regency Square Shop. Or. Portland: 1928 N.E. 42nd St. Portsmouth: 3109 5t. Orlando: Winter Park Moll, Park South Winter Virginia Beach: Pembroke Mall Shop. W. Palm Beach: 1801 Point Beach Loke Blvd. Ctr. G burg: Greengalo Mall : Stromlo: Atlanta: 23270 Coffman Ave., Roosevelt Moll 2028 Third Ave. 917 Peachtree St. 1128 Walnut St. : B37 N. F. 110th St. Gr..nbriar Shopping Center 116 SW 148th St. No. D.Kalb Shop. Or., Decatur ILLINOIS ,Belleville: Bellevue Plaza Shop. CI,. Chicogo: Evergreen Plaza of 95th St. Elgin: 526 Dundee Ave. Harvey: Di.i. Shop. r Square Crr. Waukegan: Belvidere Mali RADIO SHACK CO R- PORATION, Dept. WMI SUBSIDIARY OF TANDY CORPORATION Richmond: 753 Richmond Sq. Shop. Ctr. KANSAS Fill out and mail coupon to Radio Shack store nearest you: Kansas City: Ranch Mart So. (Leawood) Wichita: Porkies. Shop. Or. NO. CAT. QTY. DESCRIPTION PRICE EACH Bowling Green: Bowling Green Moll Newport: Newport Plaza, 70 Carothers Rd. Gretna: Oakwood Shop. Cn. r Monroe: Tower Drive Plaza : 3112 Paris Ave. NEW 1968 CATALOG FREE Shreveport: 1297 Shreve City Bangor: 20.24 Brood St. Portland: Pine Tree Shop. Or. : Peering Pkwy. Shop. Cr,. Langley Pork: Nampshirelanoley Shop. Cr,. Rockville: 1600 Rockville Pike Boston: 167 Washington St. 594 Washington St. Braintree: South Shore Flora Brockton: Westgate Mall Brookline: 730 Commonwealth Ave. Cambridge: Fresh Pond Shopping Center Dedham: Dedham Mall, 300 VFW Pkwy. Dorchester: Bayside Shop. Moll Framingham: Shoppers' World Leominster: Whitener, Shop. Cr,. Lowell: Central Shop. Plaza Orde s up to S5.00: add 50q; over S5.00: add Medford: 3505 Mystic Valley Pkwy. (Darrel Div.) to cost Natick: 136 w d. (Darrell Div.) 75¢ cover of handling and postage. Quincy, 221 Quincy Ave. (Darrell Div.) S Add STATE TAX where Applicable: N. E Shop. Ctr. 704 Broadway (Darrell Div.) Springfield: Springfield Plow Add to My Acct. Waltham: 922 Main St. (Darrell Div.) TOTAL West Springfield: Century Shop. Cn. Check Enclosed. Free Worcester: Lincoln Plata Catalog MICHIGAN I : NAME Macomb Mall (Roseville) I Lincoln Crr. (Oak Park) STREET Lincoln Pork: 18 Sears Lincoln Pk. Shop. Ctr. MINNESOTA CITY STATE ZIP Duluth: 29.31 Fos, Superior St.

20 RADIO -TV EXPERIMENTER i ' v NEW 41 : 4 HOLLOW ,,1 , y, I j SHAFT ,~_o' >i r__ e/1 1, itI líÍG9) e -s 1 L POSITIVE FEEDBACK, r00000000eoeu000n000r

JULIAN M. SIENKIESvICZ, EDITOR

Britain's Stone Age Mt. Palomar-Stonehenge nutdriver set -was built so that ancient sun worshippers could predict when their god would be eclipsed. with locknut/Screw abbusting feature Stonehenge is a circulat pattern of large stones in southern England that includes 56 in the outer ring. The stones are laid out in a scheme Speeds, simplifies setting of combination lock-nut/slotted that obviously has meaning but there is no agree- screw adjustments on rheostats and similar controls used ment as to what that is. The theory that Stone- in a wide variety of electrical and electronic equipment. henge served as astronomical observatory has Handle is drilled so you can run an 8" screwdriver blade been advanced by astronomers since early in right through its center and down through the hollow nut - this century, but archaeologists have not found driver shaft. the astronomical thinking convincing. Now, however, Dr. Fred Hoyle, director of Ideal for allround production, England's new Institute for Theoretical Astron- maintenance, and service work, omy at the University of Cambridge, has built this new HSC-1 Set contains a bridge between the two sciences, presenting eight interchangeable evidence that eliminated many of the archaeolo- hollow nutdriver shafts gists' reasons for disagreement. in the most popular he.c Archaeologists have generally attacked such opening sizes from theories on the grounds that Stone Age man 3(," thru :-1 lacked the sophistication to figure out the °/ theoretical basis of such a complex observatory. Dr. Hoyle suggests that they didn't start with a theory, but with a pragmatic wooden model that they could change as its defects became obvious. Only when the observatory evolved Really compact! Set is small and actually worked did they make it enough, light enough to carry permanent. in your hip pocket. Sturdy, see- Dr. Hoyle believes that the outer part of thru, plastic carrying case Stonehenge (the 56 circular markers) was doubles as a bench stand. built a little after 3000 B.C., and that the center structure for predicting solar and lunar eclipses was built several hundred years later. The great stone monoliths at the center of Stonehenge put in place after a long, painstaking test by trial and error using wooden E LA TE--- posts. The first wooden model tested could have resulted from the insight of a Stone XCELITE, INC. 64 BANK ST., ORCHARD PARK, N. Y. 14127 Age genius equivalent to this century's Albert Send Bulletin N867 with information on HSC1 Hollow Shaft Einstein. Nutdriver Sets. One of the most recent and ardent exponents name of Stonehenge as an astronomical observatory aderesc is Dr. Gerald Hawkins of the Smithsonian Astrophysical Observatory in Cambridge, Mass. city state & zone that the large stone markers He also suggested -r - J

FEBRUARY -MARCH, 1968 21 POSITIVE FEEDBACK

were placed in a pattern for predicting solar and lunar yy eclipses. but thought the ancient men had worked BRAND NEW out the pi oper positions theoreti- cally. Dr. ; SPRING & SUMMER Hoyle suggested, rather, that the pat- 1 tern of Nto RADIO-TV Stonehenge was worked out as a field J / ELECTRONICS experiment by very observant men who noted that every year the sun's positon in the sky was v3EE CATALOG the same at the same tinte, such as mid -summer or mid -winter. ! To w YOUR BUYING GUIDE measure such positions accurately, they 9 FOR: Stereo & Hi -Fi would have had I,t,1111- to use relatively long distances Systems & Components for sighting, Ji -` r Tape Recorders Elec- such as a about 100 yards in tronic Parts, Tubes, Tools diameter, which is the size of Stonehenge. Many aIaEE* Phonos & Records of the stones, Ham Gear Test In- however, seem to be slightly out RADIO -TV struments & Kits Cam, of place for accurate measurements eras & Film of solar PA Citi- d and lunar zens Band Radio & TV positions. ELECTRa14TCSNe11J Sets Musical Instru- Dr. Hoyle has found that 19 of the 23 posi- ments tions -_:. that seem to be out of line would be cor- rect if they were lined up for observing not the MÁII'. ¡ODA 1''TOr'r actual date of mid -summer, but for two other observations: BURSTEIN-APPLEBEE one during the week the sun ap- proached its solstice and one as Dept. RTV N, 1012 McGee, Kansas City, Mo. 64106 it moved back again. The average of these two observations Name would give a more accurate astronomical posi- Address tion than a single sighting at the time of solstice. City After several years of such observations the Einstein -of-his -time would have State Zip Code noticed that solar eclipses occurred only when the sun, earth and moon were lined up. The group then added the markers necessary to predict solar eclipses, first using wooden posts and then replacing them with the immovable stones so that later genera- `INEsI tions could not move them out of line. What amazes this editor is the enormous ener- gies expended by scientists using complex elec- ERSIN tronic computers and carbon dating techniques to discover what our illiterate forefathers were up to at Stonehenge 5000 MULTICORE years ago. Hal, the Mooch. Just the other day my friend Hal popped into the house. I say popped be- cause doors are to keep out flies, not people to zna 5 -CORE his way of thinking. Or should I say, "not to keep Hal out." Anyway, I 't too concerned. I had only a few coins in my pocket and the "."": SOLDER refrigerator was locked. After I exchanged a pleasantry with him, like "whatta you want?", we got down to business. Hal had to travel to r!, 1-1 T 1 t1'1 the library and he was short the round trip car- fare. Naturally, I posed my solution to the problem-walk! And he countered with his ,`n PTE1 `i solution which would separate the coins I had from me. Hal complained that he took the subway train e only 69c several days ago and the round trip traveling time was only a half hour. Just yesterday he BUY IT AT RADIO -TV went to the library by train, but had to return on PARTS STORES foot because some candy machine overpowered him. Riding away from and walking back home took an hour and a half for the trip. Therefore, MULTICORE SALES CORP., WESTBURY,AN.Y..115911 I just couldn't ask him to walk both ways-it 22 RADIO -TV EXPERIMENTER AIL UNUSUAL OMRDER SHOPPING M RT VALUES A selection of products available by moil for readers of Radio -TV Experimenter All merchandise sold on o money -back guarantee. Order Direct by Stock No. Send check or M.O.

4 lr

3' ASTRONOMICAL TELESCOPE "FISH" WITH A MAGNET WORKING MODEL DIGITAL COMPUTER See stars, moon, phases of Venus, planet, Go treosur hunting on the bottom! Fas Solve problems, teach logic, play games close up. 60 to 180 power-famous Mt. cinatmg fun & sometimes profitable! Tie o with miniature version of giant electronic Palomor reflecting type, Aluminized R over - line to our 5.1b. Magnet-drop it overboard brains! Adds, subtracts, multiplies, shifts, coated 3' diameter f/10 primary mirror, in bay, river, lab or ocean. Troll it along complements, carries, memorizes. Colored ventilated call. Equipped with 60X yeplece bottom-your "treasure" haul con be out- plastic parts easily assembled. 12"x3V2" and mounted 3X finder scope, hardwood board motors, anchors, other metal valu- x43/4". incl. step-by-step assembly dia- tripod. FREE, "STAR CHART", 272 -page ables. 5-Ib. Magnet is war surplus-Alnico grams, 32-p. instruction book covering op- 'HANDBOOK OF HEAVENS", "HOW TO V Type-Gov't cost 550. Ufts over 150 lbs. eration, computer language (binary sys- USE YOUR TELESCOPE" on land-much greater weights under water. tem) prooramming, problems & 15 experi- Stock No. 85,05OHP $29.95 Ppd. Stock No. 70,571HP 512.50 Ppd ments. Stock No. 70,683HP 55.98 Ppd. ;;.

ASTRONOMICAL TELESCOPE KITS NICKEL -CADMIUM BATTERY BARGAINS IT'S HERE-BIG, NEW DIGICOMP Ill Grind your own mirror for powerful teje Terrific value-used gosemment surplus. 8 -volt nickel -cad- If you think DIOBCOM.P I was something- scope. Kit contains fine annealed pyres Quick -charge. lightweight mium battery. 4 -amp. hour capacity. Almost wait 'tll you use DIGICOMP III Loads of mirror blank, tool, abrasives, diagonal mirror. works like unlimited life. Charges in 1 hr. w/Edmund fun! Terrific challenge) Actually end eyepiece lenses. You build instruments Charger Kit. Ilundreds of uses. Fee drops of electronic digital computer but needs no soloed from $75.00 up. : yearly lot lull malnirnarre. Minimum power. Add,, subtracts, multiplies, divides. Price foes. Delivers memorizes. 1st mechanical computer w/auto. Stock No. Diom. Thickness of elretrolyte-sealed to prevent for 41/4' s/e' $8.00 Pp.f. nearly 100% output al below freezing. Five ,witch action. 1st model designed pro- 70,003HP gramming. Speed reduced by factor of mil- 70,004HP 1' 12.95 Ppd. vented 1.2 volt cells. 3%rr12013o. 6' .515.00 Ppd. lion to 1-you can see what's happening. 70,OOSHP 8' 11' 21.00 Ppd. Stock No. 70.942HP (battery) 'new' math, computer techniques. Stook No. 40.798H P (I.2V. Cell) S 3.95 Ppd. Demonstrates 70,006HP 10' I y4' 34.25 f.o.b. No. 70,807HP Stock No. 70,946HP Stook (Intro. price) 516.00 Pod. 70,007HP 12íi' 21/4' 65.85 f.o.b. (Charger Kit) $ 8.00 Ppd. MONEY BACK GUARANTEE -.vv.'', --.' h1 AIL ORDER1TODAYI AAUsr* EDMUND SCIENTIFIC CO. ' 0 300 Edscorp Bldg., Barrington, N. J. 08007 µ 16 Ft. . Q Please send free Catalog "HP" 1 ! v Y! STOCK NC. ITEM PRICE s ,t

GIANT FREE CATALOG GIANT WEATHER BALLOONS Completely new 1968 Catalog. 148 paga. "Balls of fun" for kids, traffic stoppers for packed with nearly 4,000 unusual bargains. stores, terrific for amateur meteorologists. Exciting new categories. Many new Items. Please send TOTAL Create o neighborhood sensation. Great 100's of aborts, illustrations. Many hard check or M.O. ENCLOSED backyard fun. Exciting beach attraction. to -get war surplus bargains. Enormous sets: - Amateur meteorologists use to measure cloud bon of telescopes, microscopes, binoculars. heights, wind speed, and temp. Mad of magnets, magnifiers, prisms, photo come Name heavy duty neoprene. Inflate with vacuum ponenls, etc. For hobbyists, experimenters. No cleaner or auto air hose, or locally avail- workshops, factories. Shop by mail. Address able helium for high rise. salesman will call. Simply check coupon Ppd. or write for Catalog "HP" to Edmund Stock No. 60,568HP... 8'....S2.00 (CI ty State,zip Stock No. 60,632HP...16'. ..57.00 Ppd. Scientific Co., Barrington, N. J. 08007. j '[FIRMS MONEY -BACK GUARANTEE-.'f',1 ORDER BY STOCK NUMBER OPEN ACCOUNT TO RATED . éE°80 EDMUND SCIENTIFIC CO. e0º GDOÑ°RW

FEBRUARY -MARCH, 1968 23 POSITIVE FEEDBACK IOOOO 000ft=*0000000 =41 O11e01

was unkind. Not meaning to he tricked by Hal I asked. "How long would it take you to walk both ways?" Ur .. To which Hal replied, "Come on Dad, you should be able to solve this one in your head using rate times time equals distance equations. ! But I bet you the cost of the carfare plus a ham sandwich for lunch you can't solve the problem using addition and i 1ill subtraction only!" Well now, this was a challenge which I took up. After all, with pencil and paper plus the free use of addition and subtraction processes. I am a match for the best Hal has to offer, or am I? So, if you want to discover how bright your editor really is, start loitering near your favorite newsstand, or better still, bivouac next to your

Last Issue's Puzzler Come on now-do you really need an answer to the Who's for Dinner puzzler friend Hal posed last issue? OK, let's figure it out together. Draw a long table and place Careful investigation nine seats all on one side, numbering them of the photo indicates enormous inroads have been made in order from one through nine. Now, by electronics in to the marine field-look again! starting with seat one, begin counting to seven. At the seventh counted seat (which water. Our hats are off to the Ray Jefferson, happens to be seat seven), draw an "X" Division of Jetronics Industries, Inc., N' through this seat, indicating the diner left ain and Cotton Streets. Philadelphia, Pa. for the kitchen (never to 19127 for return!). Be- keeping us informed and ginning with the next three cheers for the seat (seat eight), Ray Jeff company continue to count photographer. Just dig those till you get to the end polkie-dots! of the table. Now return to the first avail- able seat at the low end of the table and Boy, Oh Boy! Well, it continue the count until seven seats have happened again. We goofed. In our been counted. Put an "X" on this seat. October/November 1967 issue of RADIO -TV we Keep this up. counting only those seats EXPERIMENTER made reference to a company whose initials were that are not "X"ed out until only one seat IRC. Natural- ly, perhaps, we assumed that is left. This will be seat two. As you can the "R" stood for "Rectifier." But, guess by now, my friend Hal was in this alas, it stood for "Resist- ance." seat. And what seat was I sitting in? Ob- The error appeared in viously, it turned out to be the seat that re- the Ask Me Another column on page 40. We ceived the dinner check (there is always have reprinted the en- one tire loser in a crowd!). question and answer below to straighten out the mess we created and we have also in- .,., ,,,,,,,,,,,,,,.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,. cluded some other useful information to show our hearts are mailbox and wait for your subscription copy really where they're supposed to be. the mailman brings. That's right, the solution is in the next issue. 1 have a bunch of transistors I salvaged Mate Ahoyl Just about everyone is swinging from various radios. Where can I to electronics find out and to prove my point I am about their characteristics? including a pie of Whosit Captain aboard the -E. M. L., Andalusia. Ala. Good Ship W/,atsit. A close inspection of the Write to IRC, Incorporated. Consumer Captain reveals she is equipped with a Ray and Distributor Products Division, 414 N. Jeff Marine Radio Telephone, Model 490 and 13th Street, Philadelphia, Pa. 19108 and Ray Jeff Depthfinder, Model 400. Priced at order a copy of their Transistor Reference $299.95 and $117.95, respectively, one can Book ($3.95). They also publish General readily recognize the low cost of these elec- Purpose/Signal Diode Reference Book tronic safety accessories every boating bug ($3.95) that's a good buy, too' Get both should have on board before he takes to the copies.

24 RADIO -TV EXPERIMENTER Now..18 different professioñal-quálíty. amplifiers, tuners & préamps completely assembled... solid state, printed circuits... priced Iowerthan.kits..

SUGGESTED TYPE DESCRIPTION LIST PRICE There are so many ways you will PCA-1.9 1W, 9V D.C. 4 Transistor Amplifier $7.20 PCA-1.14 2W; 14V D.C. 4 Transistor Amplifier 7.00 use these easy -to -install, printed - PCA-2.9 3/4W, 9V D.C. 3 Transistor Amplifier 5.90 circuit assemblies; in hi -fl PCA-2.14 1w, 14V D.C. 3 Transistor Amplifier 5.90 equipment, ham gear, P.A. and PCA-313-18.1 4W/Channel Stereo Amplifier with Bass, Treble, Volume and Balance Controls 19.20 intercom systems, or as guitar and PCA-4-9 1W 9V D.C. High Gain, 4 Transistor Amplifier for Radio, Ceramic or Crystal Phono Cartridge, etc. 8.30 organ amplifiers. Employing the PCA-4-9A Same ES PCA-4-9 with Tone Control Circuit 9.20 most advanced Complementary - PCA-4.14 2W 14V D.C. High Gain 4 Transistor Amplifier for Phono Cartridge, etc. 8.30 Symmetry transistorized designs, Radio, -Ceramic or Crystal PCA-4-14A Same es PCA-4-14 with Tone Control Circuit 9.20 these assemblies provide the PCA-4.18A 3W, High Sensitivity, 4 Transistor Amplifier with Volume and Tone Controls for use as Guitar, Radio ultimate in economical circuitry or Phono Amplifier 9.52 for reliable audio applications PCA-5A-14 2W/Channel I4V D.C. Stereo Amplifier with Balance, Tone and Volume Controls 15.80 from one watt to twenty. They PCA6A-25 8.10W/Channel Stereo Amplifier with Preamp for Ceramic Phono Cartridge and Bass, Treble, have already become the design Balance, and Volume Controls 30.10 standard for a large group of PCA-6A-25SCS Same as PCA-6A-25 with Separate Control Assembly 31.80 audio equipment manufacturers, PCA78-18 Tape Cartridge Stereo Preamp with Level Set Controls 12.00 PCA-7C18 Same as PCA-7B-18 without Level Sets; 4 Transistor .,. 9.50 as well as a basic teaching tool in PCA-8.36 20W Mono Basic Amplifier 18.85 many educational institutions. PCA-9.18 3W/Channel, 10 Transistor Stereo Tape Playback Amplifier with Volume, Tone and Balance Controls 25.30 PCR-1.9 9V 2 Transistor AM Tuner 11.30

For brochure containing complete technical data on all 18 assemblies and for name of distributor nearest you, write: Amperex Electronic Corporation, Distributor Sales Dept.. Hicksville, NewAmperex York 11802. TOMORROW'S TMINCINO IN TODAY'S PRODUCT!!

FEBRUARY -MARCH, 1968 25 12 KIT -GIVING IDEAS FROM HEATH ... For The Whole Family ... New Deluxe "227" Color TV Exclusive Heathkit Self -Servicing Features. Like the famous Heathkit "295" and "180" color TV's, the new Heathkit "227" features a built-in dot generator plus full color photos and simple instructions so you can set-up, converge and maintain the best color pictures at all times. Add to this the detailed trouble -shooting charts in the manual, and you put an end to costly TV service calls for periodic picture convergence and minor repairs. No other brand of color TV has this money -saving self - servicing feature. Advanced Features. Boasts new RCA Perma-Chrome picture tube for 38% brighter pictures 227 ... sq. in. rectangular viewing area . 24,000 v. re- gulated picture power t,ri'. ... improved phosphors for brilliant, livelier colors ,tar: . ° ' new improved low voltage 1 l~ . ... power supply with boosted B + for best operation ... automatic degaussing ... exclusive Heath Magna -Shield to protect against stray magnetic fields and maintain color purity ... ACC and AGC to reduce color fade and insure steady, flutter -free pictures under Kit GR-227 all conditions ... preassembled & aligned IF with 3 stages instead of the (less cabinet) usual 2 ... preassembled & aligned 2 -speed transistor UHF tuner ... deluxe $419.95 525 mo. VHF turret tuner with "memory" fine tuning ... 300 & 75 ohm VHF an- tenna inputs ... two hi-fi sound outputs ... 4' x 6' 8 ohm speaker of ... choice installation - , custom or optional Heath factory assembled cab- = New Remote Control inets. Build in 25 hours. For Heathkit Color TV Now Kit GR-227, (everything except cabinet)... $42 dn., as low as change channels and turn your $25 mo... 114 lbs $419.95 Heathkit color TV off and on from the comfort of your armchair with G RA -227-1, Walnut cabinet... no money dn., 55 mo $59.95 this new remote control kit. with GRA-227-2, Mediterranean Kit GRA27 Use Heathkit Oak cabinet (shown above) GR-227, GR-295 and GR-180 color TV's. ... no money dn., $10 mo $94.50 $19.95 Includes 20' cable.

Kit GR-295 Kit GR180

$479.95 $349.95 - (less cabinet) (less cabinet y n 542 coo. & cart) s30 mo.

Deluxe Heathkit "295" Color TV Color TV's largest picture ... 295 sq. in. viewing area. Same features Deluxe Heathkit "180" Color TV and built-in servicing facilities as new GR-227. Universal main control Same high performance features and exclusive self panel for versatile in -wall -servicing facilities installation. 6' x 9' speaker. as new GR-227 (above) except for 180 sq. in. viewing area. Kit G R-295, (everything except cabinet), 131 lbs.... Kit GR-180, (everything except . 548 dn., $42 mo cabinet), 102 lbs.. 8479.95 535 dn., $30 mo. $349.95 G RA -295-1, Walnut cabinet (shown above), 35 lbs... GRS-180.5, table model cabinet & mobile cart (shown no money dn., S7 mo. $62.95 above),.57 lbs....no money dn., $5 mo $39.95 Other cabinets from 594.50 Other cabinets from $24.95

40 -Lesson Re- America's cord Course Lowest Cost FREE With Either Solid -State Organ .. . . rl ea thkit/ __Y ' Thomas Organ! OK" -4 a ,. ,a o A 550 Value !In- Kit 00-3258 sd cludes tour 33 rpm records. $394.90 music leatherettebook & $40 dn., 534 mo. album.

Sere Up To $205! Instant - , Kit 10.67 play Color-Glo; 10 voices; 13 -note bass pedals; repeat o , F $995 percussion; 37 -note key , (including boards; 75 -watt peak power; bench) i ' 5200 vibrato; assembled walnut a ..' é ,l 0 dn., 7 as low as 529 mo. cabinet & bench. 172 lbs. n-, 7', 33 VI rpm demonstration record 50c. S Heathkit o /Thomas "Paramount" Theatre Organ Exclusive Band Box Percussion Save Up To S500! Build in 80-100 hours. All Thomas factory -made parts Automatically or manually adds 10 percussion voices to any Heathkit/ ... 15 manual, 4 pedal voices; instant -play Color-GIo; all -transistor cir- Thomas organ. Build & install in 12 hours. cuit; 200 watts peak power; 2 -speed rotating Leslie plus main speaker Kit TOA -67-1, no money dn., $14 mo. $145.00 system with two 12' speakers; 44 -note keyboards; horseshoe console with stop tablets; 28 -note chimes; 13 -note bass pedals; repeat & attack Exclusive Playmate Rhythm Maker percussion; reverb; headset outlet; assembled walnut finish hardwood Add. 15 fascinating rhythms to any t learhkit/Thomas Organ. Requires cabinet & bench; and more. 265 lbs. 7', 33%4 rpm demonstration Band Box percussion (above) for operation. record 50c. Kit TOA -67-5, no money dn., $18 mo. $189.90

26 RADIO -TV EXPERI-14ENTER USE COUPON TO ORDER NOW! NEW! Deluxe Solid -State Combo Amplifier & Speaker System... Choose Kit Or Factory Assembled.

Amplifier u Kit TA17 $175 $17 mo. (Assembled TAW -17 5275)

Speaker System K t TA -17-1 $120 $11 mo. (Assembled TAW -17-1 $150)

Special Comb nation Offer Amplifier IL Two Speaker Systems Save $20 $349.95 Kit TAS17-2 ,a 535 dn.. 530 mo. $395 $40 dn. $34 neo. (Assembled NEW! VOX "Jaguar" TAW -17-2 5545) Transistor Combo Organ By Heathkit All the "big sound" fea ures every combo wants ... tremolo, built-in Save Up To 5150 on the world's most popular combo organ with this "fuzz", brightness, reve b, separate bass and treble boost and more. new Heathkit version. Features the most distinctive sound of any Delivers a shattering 120 watts HA music power (240 watts peak combo organ. Has a special bass output that gives a brilliant stereo bass power) through two TA -17-1 speakers ... or 90 watts th ough one effect when played through a separate or multi -channel amplifier, 4 TA -17.1 speaker. Features 3 independent input channels, each with complete octaves, vibrato, percussive effects and reversible bass . two inputs. Handles lead or bass guitars, combo organ, accordion, Includes hand crafted orange and black cabinet, fully plated heavy-duty singer's trike, or even a record changer. All front panel controls keep stand, expression pedal and waterproof carrying cover and case for you in full command of all the action. stand. Requires a bass or combo amplifier like Heathkit TA -17 (op- Speaker system features two IY woofers, special horn driver and posite page). matching black vinyl -covered wood cabinet with casters & handles Kit TO -68, 80 lbs.... 535 dn., $30 mo . $349.95 for easy mobility.

.i' R Kit IM -17 iwaer7i um! II t $19.95 y o.i Kit AR -17 NEW! $72.95 ;11; (less anoncabinet) ) Solid -State f! -~.t NEW! to Portable y`Z Lowest Cost Solid -State Stereo Receiver Volt -Ohm -Meter , Features wide 18-60,000 Hz response (o, ±l db at full 5 watts RMS power per channel ... 14 watts music power ... inputs for phono and auxiliary ... automatic stereo indicator ... outputs f 4 thru 16 ohm So Bandy, So Low Cost we call it "every man's" meter. lust right for speakers ...adjustable phase for best stereo ... flywheel tuning ...and homeowners, hobbyists, boatowners. CBer's, hams ...it's even sophis- compact 954' D. x 2'/e' II. x I PA" W. size. 12 lbs. Optional factory ticated enough for radio & TV servicing! Features 12 ranges ... 4 AC & assembled cabinets (walnut $7.95. beige metal 53.50). 4 DC volt ranges, 4 ohm ranges: 11 nrgohm input on DC, I megohm Kit AR -17, (less cab.) 12 lbs.... no money dn., 58 mo.. $72.95 input of AC; 4'h' 200 uA meter; battery power: rugged polypropylene Kit AR -27, 7 -Watt FM Mono Only Receiver (less cab.) case and more. Easy 3 or 4 hour kit assembly. Ideal gift for any man! 9 lbs.... no money dn., $5 mo. $49.96 4 lbs. - rEAT'HSI rHEATH COMPANY, Dept. 19-2 Benton Harbor. Michigan 4902 NEW In Canada, Daystrom Ltd. ID Enclosed is FREE 1968 , $ ,including shipping. CATALOG! Please send model (s) Now with more kits, more color. Please send FREE Heathkit Catalog. Fully describes these along{ troth over 300 Ws for stereo/hl-fl, Please send Credit Application. color TV, electronic organs, elec- tric guitar d amplifier. amateur wane radio, marine. educational. Ce. home a bobby Mall coupon or Address write Heath Company, Renton Kerber, Michigan 1907. glY State Zip Prices a specifications subject to change without notice. CL312

FEBRUARY -MARCH, 1968 27 -1 Live Better Electronically With 'LAFAYETTE' CB RADIO. ELECTRONICS RIGS & 1968 Catalog 680 FREE: RIGMAROLE papnu5 Now OFF PRESS BETTER THAN EVER Over 500 Pages Stereo HI -Fi Citizens Band Ham Gear Tape Recorders Test Equip- ment TV and Radio Tubes CD and Parts Cameras 0000 Auto Accessories Musical rM! Instruments Tools Books Featuring Everything in Electronics for Cape Kennedy Rides Again. We recently saw HOME INDUSTRY LABORATORY a new CB rig which is just about guaranteed to from the "World's Hi -Fi & Electronics Center" bring a lump to CBers' throats. Fine business LAFAYETTE Radio ELECTRONICS with your super -miniaturized rigs which Dept. BA -8, P.O. Box 10 can Syosset, L.I., N.T. 11791 place so much talk power in a pint-sized cabinet i -that's a popular trend in CB gear of late. Send me the FREE 1968 LAFAYETTE Catalog 680 EXB-8 What about Tram Corporation's (Lower Bay Name Road. Box 187, Winnisquam, N.H. 03289) new Address _ _ Tram Titan 11? City State____.__..... Going their very own way. Tram has brought Zip out a really BIG piece of CB ecstasy. Nothing (Please Give Your Zip Code No.) J miniature for this baby, it's a large, impressive, solid. massive, heavy, and sharp hunk of com- WORLD'S munications equipment intended for base sta- MOST POPULAR $1 PARTS PAKS tion use. There's not a whisper of doubt as to 5-1 Amo 800 PIV EPDXYS, submini 51 what this thing is sitting there on your desk- S25 SURPRISE PAK: transistors, rent. diodes, etc SI 40 PRECISION RESISTORS, I,_,, 1. 2w: 1% values SI you're either one of the world's most "in CBers 30 TRANSISTORS, rf, if. audio ose -ifs, TO5 no test Si 60 TUBULAR CONDENSERS, to .5mf. to I bv; asst SI 40 DISC CONDENSERS, 27 mmf to .05 mf to 1 K V $1 60 TUBE SOCKETS, receptacles. plugs, audio, etc. Si 30 POWER RESISTORS.. to :row. to 24K ohms $1 4-"EPDXY" TRANSISTORS 2y3563, 600 DMC S1 10 VOLUME CONTROLS, to I men, switch too! Sl 10 ELECTROLYTICS, to 500mf, asst FP& tubulars SI 50 RADIO & TV KNOBS, asstd. colors & styles Si 10 TRANSISTOR ELECTROLYTICS: 10 mf to 500 mf $1 SO COILS & CHOKES, If, rf, ant,.Osc, L more SI 4-"EPDXY" TRANSISTORS 2N3643 by Fairchild. Si 75 HALF WAITERS, asst incl: 5'% too! ,$1 60 HI.O RESISTORS, ?'., 1, 2\V, 1 ,; & 5,¿ values $1 10 PHONO PLUG & JACK SETS, tuners, amps Si 3 EPDXY TRANSISTORS 2N4265 by Motorola -°PR $1 INFRA -RED PHOTO DETECTOR TRANSDUCER $1 INFRA -RED PARABOLIC REFLECTOR & FILTER SI 2 PETS FOR HOBBYIST, EXPERIMENTERS "N" Channel $1 4 TRANSISTOR TRANSFORMERS, asst. worth $25 SI 4 EPDXY TRANSISTORS 400 nFE by Fairchild SI ' 60 CERAMIC CONDENSERS, discs. opus, to .05 Si 40 "TINY" RESISTORS, 1/10W. 5',; too! SI 50 TERMINAL STRIPS. 1 to 8 solder lug types S1 30 MOLDED COND'S, mylar, pore, black beauty S1

MICROAMP METER, brand new 100 microamps CE..j27O

SPEAKERS

1 (.)-2 )) b 17 ohms. Z$ PHOTO for 2y. p For CELL S1 á GIANT OPRIMO CATALOG OM: PARTS -R[C. t S l TIFI[RS 15TOR5 OCAS' SON[RS I 1:nel^b INCLVTIE t'OSTACF.. A ¢. Nt. per pat 1 lb. COD. 25% POLY PAKS,_ One thing about the folks at Tram, they NÚ194á4MASS. know how to show off their Titan II CB rig.

28 RADIO -TV EXPERIMENTER r

r c

1 d . . - g.: :A low' cost Crystal for the Experimeñter. .Iñtérnattonal. . .

'LOW COST MINIMUM DELIVERY TIME 'Postage 3,O015 KHz to 60,000 KHz Paid

SPECIFICATIONS: International Type MINIMUM CELIVERY TIME We guaran- "EX" Crystal is available from 3,000 tee last processing of your order. Use KHz to 60,000 KHz. The "EX" Crystal special EX order card to speed delivery. is supplied only in the HC -6/U holder. You may order direct from ad. We will Calibration is ±.02% when operated in send you a supply of cards for future International OX circuit or equivalent. orders. CONDITIONS OF SALE: All "EX" Crys- tals are sold on a cash basis, $3.75 each. Shipping and postage (inside U.S. and Canada only) will be prepaid by International. Crystals are guaranteed to operate only in the OX circuit or its 911 equivalent.

ORDERING INSTRUCTIONS (1) Use one order card for each fre- quency. Fill out both sides of card. (2) Enclose money order with order. (3) Sold only under the conditions specified herein.

COMPLETE OX OSCILLATOR KITS Everything you need to build your own - oscillator. Two kits available. "OX -L" kit 40517: 3,000 to 19,999 KHz. "OX -H" kit 20,000 INTERNATIONAL to 60,000 KHz. Specify "OX -L" or "OX - H" when ordering. $235 Postage Paid CRYSTAL MFG. CO., INC. 10 NO. LEE OKLA. CITY. OKLA. 73102

FEBRUARY -MARCH, 1968 29 CB RIGS & RIGMAROLE

or you're a Cape Kennedy missile control center. The Tram Titan II is actually 2 complete transceivers in one cabinet, a standard ampli- tude modulated rig plus a rig which offers double-sideband suppressed carrier unit. The receiver can inhale amplitude modulated sig- nals. single or double sideband (reduced or sup- pressed carrier). Switching back and forth from one form of . -o modulation to another means the flick of a switch. Sideband transmission offers greatly ex- yI.: FREE tended transmission range over amplitude mod- ulation, in addition to also insuring some de- v gree of privacy in your communications (the _ only people who can copy sideband signals are Fill in coupon for a FREE One Year Subscrip- those equipped with receiving gear intended for tion to OLSON ELECTRONICS' Fantastic Valu Packed Catalog-Unheard of LOW, LOW PRICES this mode of transmission). on Brand Name Speakers, Changers, Tubes, The receiver features a mechanical filter which Tools, Stereo Amps, Tuners, CB, and other Val- ues. Credit plan available. cuts interfering signals down to virtually nothing. NAME A meter on the front panel measures both the ADDRESS transmitter and antenna systems, showing for- CITY STATE ward power into the self-contained dummy load, GIVE ZIP CODE the power to the antenna, and also the SWR. If you hove a friend interested in electronics send TV interference is clipped out by a built-in his name and address for a FREE subscription also. filter. The chassis is designed for easy probing O.LS,ON .ELECTRON.ICS around inside (take a picnic lunch, it's a big place). As you can see, ifs really spectacular! INCORPORATED Getting down to the nitty-gritty. the Tram 809 S. Forge Street Akron, Ohio 44308 Titan II will cost you $482 (you expected maybe $19.95?). It comes ready to go on all 23 CB channels and if it doesn't make you the most FIRST WITH popular guy on the band in your area then * Digital Integrated Circuits. maybe you've got a personality problem. . * 4 Crystal -Controlled Oscillators ° Shure Is Neat, Pardon the pun. but we just Battery & AC Operation Standard * couldn't resist it. In fact, Shure Brothers. Inc. (222 Ilartrey Avenue, Evanston, Ill.) did resist it-their new Model 444T variable output mike, we mean. They incorporated into the design of this base station mike a 2 -transistor mike preamp which

The New Pace -Setting CONAR Model 680 COLOR GENERATOR KIT $83.50 WIRED $114.50 Until now, no commercially available color generator has offered so many quality features in a single instrument at such a low price. Only the CONAR SIGNAL GENERATOR has all these features at any price: exclusive digital integrated circuits; IP, exclusive .4 crystal -controlled oscillators; exclusive Shure 444T AC or battery operation standard; completely solid state; color amplitude control; color phase adjust- Microphone ment; regulated power supply; stability control; TV with built-in station sync and blanking pulses; nine patterns; red, Preamplifier blue and green gun killers; compact; lightweight; port able. For details write Dept. BPSC CONAR instruments DIVISION OF NATIONAL RADIO INSTITUTE 3939 Wisconsin Ave., Washington, D.C. 20016 IWRLYE, FOR.'FREE` CONAR CKTALOG'

30 RADIO -TV EXPERIMENTER CB RIGS & RIGMAROLE

will boost the modulation output of any CB rig which is slightly anemic in this department. HERE'S YOUR ONE -SOURCE FOR The preamp runs from a self-contained battery with 300 hours of life. The height of the mike may also be adjusted to take into account the CERAMIC CAPACITORS height of your operating desk and the length of AN D your neck (no Charlie, it doesn't limit the length of your transmissions too). SEMICONDUCTORS So if you are being "shouted down" by others on your channel with newer and ELECTRONIC , flashier rigs ® COMPONENTS y' having more "talk power" than your old war- STATION IP T' ... and NOW horse, try a Shure 444T and snarl back with a voice as loud as any on the hand. 11=F:=;# YOU GET

More Walkie, More Talkie. How about a $500FF* 3 -channel walkie-talkie running a hefty 1/2 - watt for. would you believe, $32.95? Well we when you buy aren't joshin' because Lafayette Radio, 111 Components from Jericho Turnpike, Syosset, L.I., N.Y. 11791, real- ly has one. It's their HA -305 and includes among

its features: 14 transistors, 1 diode, 1 varistor,

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FOR FREE $.50 Coupon and uV sensitivity, range boost modulation. provi- 6 -Page Components Catalog sions for tone call alert and 117 -VAC operation Send to: with optional battery eliminator. ERIE TECHNOLOGICAL PRODUCTS, INC. Now you will say that it is not enough Erie Distributor Sales 644 West 12th Street Erie, Pa. for your investment? They've also included a 16501 battery condition meter, a set of batteries, a car- PLEASE SEND CATALOG AND PRICE DATA... TODAY rying case, set a of channel 9 crystals, and a CB NAME license form (whew!). Looks like the only thing COMPANY you don't get with this is shares of Lafayette stock! (You can also ask for their all -new 1968 ADDRESS catalog that's packed with great CB buys and CITY STATE many other goodies.) L

FEBRUARY -MARCH, 1968 31 ********* *****************1 S PEED I f 24 HOUR DELIVERY. - We guarantee that we will ship all orders ..I' for 10 crystals or less within 24 hours of receiving the order. ASK ME ANOTHER RADIO TV EXPERIMENTER 505 PARK AVENVE o NEW YORK, N.Y 10022 RENTP1y 117-

Euy 7f[C Vat

SEND FOR OUR 1968 CATALOG OF PRECISION QUARTZ CRYSTALS AND ELECTRONICS QFOR THE COMMUNICATIONS Amateur Juvenile / am not old enough to have a CB license. But I have heard that it does not matter what your H age is for ham license. Is this true? SENTRY MANUFACTURING COMPANY -D. L. S., Brookfield, Mo. 1634 Linwood Boulevard -Oklahoma City, Oklahoma 73106 Wish I had your problem. Yes, it's true. If PHONE: 400-232.1431-: 071.361-TWR:OIO-031-3176 you can pass the test. Start studying.

Great Mind's Quick -Think NOWWRI FORE M c G E E'w7 1N968 After reading the tornado article in your June - CATALOG July issue of RADIO -TV EXPERIMENTER, / SE FREE thought up a tornado warning device. Why not 1001 BARGAINS IN use a fluid type barometer with a photo-cell to SPEAKERS-PARTS-TUBES-HIGH FIDELITY detect the sharp drop in barometric pressure COMPONENTS-RECORD CHANGERS- which occurs when a tornado approaches? The TAPE RECORDERS-KITS- photo -cell can switch on a siren, buzzer or other IN EVERYTHING ELECTRONICS alarm to warn people of the approach of a McGEE RADIO CO., tornado. 1901 Mc Gee St. IRTE) Kansas City, Missouri 64108 -B. O., Bronx, N. Y. SEND 1968 McGEE CATALOG A call to the U. S. Weather Bureau reveals NAME that the drop in barometric pressure occurs sec- ADDRESS onds before a tornado hits só don't bother 1_ CITY - STATE ZIP patenting the idea. l L-ARN DRAFTING U.S. Labor Dept. says "42% more Jr Draftsm.n ded neat 10 years." AT Send for FREE 'DRAFTING CAREER Attention Megawatt CBers kr NOME.,--.IumA' KIT." No salesman will call. 1 would like to know if the power of a CB NAME nasl IieG AGE walkie-talkie transmitter can be boosted front ADpscss 0.2 watts to 1.0 watt. If not, why not? ALL 3 CITY STATE ZIP -H. M., Northampton, Pa. FREE NORTH AMERICAN SCHOOL OF DRAFTING. Dept. 2821 'Cause I'll bet you won't spend a couple of landed A Ise Lei Ns 4500 Campus Newport, Drive, California 92660 J hundred bucks having a lab certify that the modification meets FCC specs. SEND FOR FREE CATALOG Featuring transistors, rectifiers, tenors, SCR's, LS/S\S_ biswitches and other semiconductor devices In T large and small quantities. ALL DEVICES ARE CHECKED AND GUARANTEED. IN. Get With It You Guys TEGRATED CIRCUITS (JK. SR. SRT FLIP FLOPS AND GATES) with checked inputs I enjoy your magazine and eagerly await its T E and diagrams are available. arrival here. I find it of ntuclt greater interest SOLID STATE O E S SALES than its English counterparts. is Box 74E, Somerville, Mass. 02143 My problem that I have trouble getting components. I have

32 RADIO -TV EXPERIMENTER k************************************* written to both Allied and Lafayette asking for VHF RECEIVER their catalogs but have received no reply. Could AM/FM-MULTI-BAND you possibly give me the name and address of a HUGH SENSITIVITY-SELF CONTAINED distributor in the who would take Hear police, fire, aircraft, the trouble to ship parts outside of the United amateur CB, etc. signals. - Covers 26 to 54 and 88 to States? am able to send I dollars. 174 me in eight calibrated W, -I. McK., Kitwe, Zambia bands. Plus a ninth adjust- Allied, Lafayette, Radio Shack and anybody able band for 15 or 20 meter SW BC listening. Five tubes e else interested in selling equipment to this gentle- AC power supply with silicon * man, send your catalogs to Mr. 1. McKenzie, 173 rectifier. Philip St.,' Nkana East, Kitwe, Zambia. Write for catalogue of complete 364C line of converters, receivers and audio equipment for recording. $59.95 Match a Mis KUHN ELECTRONICS, INC. I have a transistorized amplifier and I'm 1801 Mills Ave. Norwood, Ohio 45212 plagued with a niinimrml impedance problem common to these units. Is there any way to World Famed BREVETTATA connect more than two speakers to the unit, without dropping the impedance below 4 ohms? TEAR GAS w PISTOL -P. P., Castro Valley, Calif. Appearance of this fine tear pas weapon is similar to real i Sure,tconnect the speakers in series or series - gun. It is Ideal for people who work in lonely, locations parallel as shown. and require protection. Men give this gun to wives and , daughters for night security. ( Many industrial applications. Shooting of gun stops aggres- sor without permanently injur- ing him, Neither permit nor license Is needed, but It is not sold to minors, It Tres six car- f tridges without reloading. Each gun comes with six tear gas shells and six blanks for practice and Is shipped prepaid. Gun unit prices include, 12 shells and all shipping costs. I Gun -unit at $13.07 2 Gun -units at $22.86 (511.43 ea.) 3 Gun -units at $29.94 S 9.98 ea.) 4 Gun -units at $35.16 (5 8.79 ea.) 3 IN SERIES 4 IN SERIES- PARALLEL Ent a bores of ten tear pas shells at $1.50 Per box (prepaid with gun orders). Extra boxes of blanks at Si.25 per box. Searching, Ever Searching UNITED SAFETY SUPPLY CO. 310 West 9th Street l sent you a question over four years ago Kansas City 12RT, Missouri 64105 and I still haven't seen the answer. -I. R. A., Big Sur, Calif. When Answering Advertisements Sorry about that-what's the question? Sag You Saw It In For the Price of a Penlight Cell (RADIO -TV EXPERIMENTER I have a flash camera that uses AG-I(B) flashbulbs and two penlight cells. I would like 'SNOOPERSCOPE' IR .TUBE to build an AC adaptor so I can take flash pic- Used by the Military for night viewing. Permits observation in the dark of tures with the unit using house current. ' night. Unused British IR Image Converter Tube with plane for construction os night viewer only $4.50 -R. T., Daytona Beach, Fla. postpaid. The 84 page catalog of hundreds of unusual opt)-electronie Cheapskate! diagram shows an AC adap- surplus equipment. Send 25e stamps or coin for catalog. tor that could be used with your flash unit. it'll MESHNA 19 ALLERTON STREET a LYNN, MASS. 01901 even recharge the batteries if they're left in the . circuit, but at the cost of penlight cells, is it worth it? THOUSANDS OF BARGAINS GE -X4 TOP VALUES IN ELECTRONICELECT - T= °ENIITE Transistors, Modules, C. B., Speaker, Stereo, HI-FI, CELLS Photo Cells and Thousands of Other Electronic Parts. IN FLASH Send for FREE Catalogue T UNIT ELECTRONIC 70 DISTRIBUTORS INC. 117 VAC 6.30011 FILAMENT EDI TRANSFORMER Dept. TA -2, 4900 Elston Chicago, III. 60630 Watch Those High -Powered D CUslr CaTAwcue Cartridges Name In my hi-fi system, / have two turntables feed- Address ing into one input of my amplifier. / have been City told that 1 ant overloading the input and this will State Zip Code

FEBRUARY -MARCH, 1968 33 ASK ME ANOTHER ************************************************

damagé the amplifier. Please tell me if this is so. way, unless you're a TV expert, keep your Cot- -J. G. R., Quaker Hill, Conn. ton picking fingers out of that set. There áre Only if the cartridges are 100 -watt jobs. high voltages present and you might misadjust things. To improve your TV reception, use an Divide and Conquer outdoor antenna. 'What is the trick used by organ manufacturers to get different notes? They surely don't have 88 Technicolor Hope difieren! oscillators. Could you publish a simpli- I thought that your article on how to convert fied schematic? - black and white TV to color was very interest- -O. B., Council Grove, Kan. ing. However, / would like to know if there's Those tricky organ manufacturers use a bank any way to get color in front of the CRT with- of 12 tone oscillators followed by frequency out using the color wheel and still using the dividers. The diagram will give you a quick idea monochrome CRT. of how it's done. -B. K., Cedar Falls, Iowa Do it and you won't have to DIVIDE DIVIDE BANK OF DIVIDE DIVIDE t/32 depend on Social Security. 12 -- BY -- BY BY -- BY OSCILLATORS 2 2 2 2 BCB Blues 1 When I tune past 20 kHz on FUNDAMENTAL f/2 nzy shortwave set, all I get is AM f/4 f/8 f/16 OUTPUT band signals-distorted. I get no Come Again? sign of life in the 10, 11 and 15 meter bands You sure have a boring column. except these BCB stations. What can I do? -W. K., Southhampton, U. K. -G. C., Fords, N. J. Thanks. Punt! Immovable Audio Glutton for Punishment Can you give me a circuit for a very stable For fun and games 1 built a double -conversion fixed frequency audio oscillator? FM tuner using tubes. It has a cascode front -N. G., Washington, D: C. end, four IF stages, a second convertor, one RC Be glad to. The schematic shows an oscillator low IF stage and two limiters. The IF's are 10.7 employing a Twintron electro -mechanical reson- MHz and 200 kHz. Can you give me a circuit ator and a Darlington amplifier. You can get a for a cycle counting FM detector? fixed -tuned or tunable Twintron (300-3000 Hz, -R. F., Victoria, B. C. 100-700 Hz or 700-7000 Hz); they are available Boy, will you need a wideband IF amp. Since

from 11 13 Engineering Corp., 1 101 Ripley Street, the FM signal deviates ±75 kHZ, the low IF Silver Spring, Maryland. The transistor should will swing from 125 to 275 kHz. You might try be available at any GE transistor distributor. the detector circuit shown in the diagram. Ex - 4.7MEG (Continued on page 37)

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Sure Is Interesting Will / get improved TV reception if l place the TV signal booster between ins, portable TV's huilt-in antenna and the TV set's input circuit? "Hello, Ed's TV? About this You sure have an interesting magazine. problem of my picture pulling . . . t11. L. Andalusia. Ala. It's sure interesting that you think so. By the

34 RADIO -Tv ExPERIMtN1é:R NAME-PLEASE PRINT

ADDRESS

CITY

ZIP STATE 206

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WORLD'S LARGEST SELF( TIOHS SATISFACTION GUARANTEED OR YOUR MONEY BACK

NAME-PLEASE PRINT pages ADDRESS

CITY New 1968 Allied Catalog STATE ZIP II r It .. ' T er.nc_ nu w 1)tig 20B edition a the w r i s most famous ,atalc g e le ulprlent 51 pape , In( 11 k- comp de FILL THIS CARD OUT-MAIL IT NOW! Xnight Xit ( +t 1 9, ¡vet4rrnK, de srnhtrm, and 1 rum), thnusands ni items-rho moat .inl1 te invent eri ive r assembled u` hi i. r, dios, t cpe recorders ('Fi,e1,-ctr Lie quipm nt. parr,: trn,la, , I r. nte nev-s.ah.irLr pnc es Y u'11 wait u,,.Lr n pk r e na'

coin, e I t Te Alb( e1 ('a 1101= It's / e .k tio ti d off, fill 0 it. (1 cn erl a card At mil ». _)u it non'. f 1968 CATALOG % ' .+,I:' 4V 4N MONTHS TO PAY! NO MONEY DOWN -24 aq o, Low Monthly Payments t3 fit your budget. WORLD'S !ARGUE SELECTIONS OR YOUR MONEY BACK DO A FRIEND A FAVOR-Sive him this card SATISFGCTION GUARANTEED to send kr his FREE ALLIED CATALOG RUSH THIS CARD TODAY! for your Why Buy by Mail from a AWOL 1. ALLIED? 1968 Each year Allied fills more ALLIED than a million orders by mail. Only 1 LitIP CATALOG the complete facilities of the world's largest elec- tronics supply house can satisfy all the needs of hi-fi enthusiasts, CB users, engineers, "Hams" and experi- menters.

WORLD'S LARGEST SELECTIONS Imagine shopping for hi-fi where you can select from every model of 15 major manufacturers of receivers, tuners and amplifiers, 14 brands of tape recorders, 7 makes of turntables, nearly 100 speakers from a do zen manufacturers. Plus simi- lar choices in every area of electronics-CB, Ham, test equipment, Fits (including Knight -Kits), parts, supplies ... almost anything you want. N 2 MANY PRODUCTS NOT AVAILABLE ANYWHERE D ELSE n As the world's largest supplier of electronics, Allied can atTurd to stock thousands of items not availably elsewhere. In addition, many products are specially -built to our specifications.

YOUR SATISFACTION GUARANTEED OR YOUR MONEY BACK! RUSH THIS CARD TODAY! FIRST WITH THE LATEST FOR 47 YEARS We have always been the first to offer the latest developments in electronics, as you will see when )J you get our new tree catalog. tr j-1 ¡ WE QUALITY -TEST WHAT WE SELL Among all electronics supply houses, only Allied has a continuous program of quality -testing to ALLIED assure you that everything you buy meets the CATALOG highest standards.

Y COUNT YOUR SAVINGS AT ALLIED You always get the- lowest prices at Allied. Check Allied prices and compare. Look for special values-available only in the Allied catalog. IMMEDIATE SHIPMENT There's no delay when you deal with the world's largest electronics supply house. Orders are filled promptly-usually the day they're received. NO MONEY DOWN - UP TO TWO YEARS TO PAY You don't need cash at Allied. Up to 2 years to pay. Make "add -an" purchases - even though you are already raying for something else. It's easy to he a credit customer at Allied. SATISFACTION GUARANTEED OR YOUR MONEY BACK Buy with confidence from Allied. We guarantee satisfaction or money hack. ENJOY "EASY -CHA R" SHOPPING m Shopping's easy at Allied. More m accurate. too! You always know exactly what you get. And what a choice! A selection of mer- chandise so vast no store could ever assemble and stock it all. ASK ME ANOTHER **********************************,r.*,r***********

Continued from page 34 Canned Ham? with various values resistors and periment of What company puts out a recorded general capacitors until you get the best results. Good class operator license course? luck Charlie. -I. C., Pea, Mo. Don't know of any. Sounds like a great idea. Someone should do it. There are several code Cl courses listed in electronics mail order catalogs. SIGNALJIF AUDIO Pick up a headset at the same time and spare FROM OUTPUT the family from de -daft noises. LIMITER' C3 102 Cl Shocking! Do you have any information on methods to combat excessive static electricity for an operator of buffing and polishing machines CYCLE COUNTING DETECTOR where the product is cleaned in gasoline? Is static electricity conductible by "wiring" the operator back to the press? Is this safe-in the Tape's Here to Stay event something should happen to the machine? Could you supply me with the name of a -M. M. A., Fayetteville, Ark. company or companies which manufacture and sell home record cutters? in plants where static is a problem, special -G. I. D., Toledo, Ohio conductive shoes are worn by personnel who Nope. Only pro jobs available nowadays. stand on grounded metal plates. For consider- able information on static, write to National Unseen Commercials? Fire Protection Association, 60 Battery March How can I receive just the sound from TV St., Boston 10, Mass. They have a publication, stations? identified as 77-M, which is supposed to cover -S. S., South Bend, Ind. the subject quite well. Get a hold of a TV tuner somewhere and con- nect its to the antenna terminals of a 30- output Lots a Space? 50 MHz tunable FM communications re- would like ceiver. Apply filament and B+ power to the / have a National 188 receiver and instead put- tuner and set the receiver to the output IF of to put an antenna in my window of the tuner (around 45 MHz). Hook an antenna ting out 100 feet of wire outside. T., Fargo, N. D. to the tuner, switch it to an active channel and -P. you should he in business-but why bother? You'll get much better results with an outside antenna. You should have plenty of room for one out there in North Dakota. Window anten- nas are what a New York cliff -dweller must put ANT up with. But why you? B+ FIL.

TUNER OUTPUT r 30-50MH_ TV TUNER FM RECEIVER

Fringe FM What can I do to improve the reception of my FM auto radio? I anm using a 31 -inch fiber- glass antenna. I don't live in a fringe area. -K. C., Leechburg, Pa. Judging from an atlas, you are in a fringe area for picking up Pittsburgh FM stations with a car antenna. There are intervening hills and "Á new squawker and woofer vegetation which have an adverse effect on VHF I can live without!"

(FM -band) reception. w..,.,,,,,,,,,,,,,,,,.. ,.,,,,,,,,.,,,,,.,,.,,,,,,,,,,,,,,,,,,.. 11,,,,,,,,1,11,,..,,,,m,,,,,,,,,,,,,,,,,,,1,,,,,,

FEBRUARY -MARCH, 1968 37 -7 ú****>!r******ú*********irú***** Rechargeable Human Toaster NEW PRODVCTS The Porto -Warmer from Esdee Industries will keep you snug and warm by means of a pocket- size power pack connected to thin warming HIGH-FIDELITY pads. Back from the game or the hunt, you simply connect the power pack to the 117 - AN_ATEVR RADIO VAC recharger. The 6 -volt power supply pro- SHORT WAVE RECORDERS GIMMICKS GADGETS i\t,TOOLS .- .0. ETC.

Esdee Industries PortoWarmer Shape Up, Men! You can save heaps of time and money with duced over 1200 total hours of heating. at 6 the Wireformer. It bends, it straightens, it cuts hours use per charge. The heating pads are -with this simple tool you can make your own waterproof. The Porto -Warmer, complete with peg -board hooks, shelfhangers, shelves, clamps, power pack, recharger, heating pads, and shoul- handles, etc. Wireformer works with any size der strap is available for $39.95 postpaid from wire up to %2 -in. diameter in any metal, in- Esdee Industries, 9219 W. Pico Blvd., Los An- cluding coat hangers. Twill bend in any shape, geles, Calif. 90035. from a closed eye;iá-ín. in diameter to a large perfect circle as large as the length of the wire Bingo Bango Bongos permits. All parts are case-hardened, - cold New kit in the EICOCRAFT line is the rolled steel and the handle is plastic. Fits in Model EC -1600 Solid -State Bongos, $7.95, con- your pocket. You can get the Wireformer, com- sisting of battery -operated, transistorized oscil- plete with illustrated instructions for precision lators plus preamplifier. When touch plates are forming and a special adapter for small size tapped the percussive sounds of bongos, torn - wire, direct from the manufacturer-Vinkemul- toms, etc., are electronically reproduced (can der Mfg. Co., 917 Princeton Blvd.; Grand attach to any guitar amplifier. hi-fi system). Rapids, M ich. 49506-for a mere $3.98. Two other new EICOCRAFT kits are the

EiCflCF `,FT- S

i,fr- a.__.... -

. 1 i'"'`: , j ,...... l,

Vinkemulder Wireformer EICO's Eicocraft TruKits 38 RADIO' -TV EXPERIMENTER ******tYúi`r****si****fr***** *ía** NAVY BANDE WALKIE-TALKIE Model EC -1400 FM Radio, $9.95, and Model TRANS. & RECEIVER Crystal controlled. can be operated en any one channel in freq. range 2.3 to 4.8 EC -1500 AM Radio. $7.95. Both operate on MC. Voice (A31 communication only: output of Trans. is 0.2 nattx & satisfactory communication between respective broadcast units aver average terrain should be maintained approx. bands, are battery -operated up to one Ili mile. With Tuber: 1/1R:. 1/15.5. 2, ITS, and 31384. Voltages regnbxd: 81.5 VDC 3 MA: 135 'DC tunable. and are employable as personal 4 MA: 1.5 VDC 225 MA f/Receiver. 87.5 VDC 1.5 MA: 13.. VDC 10 MA: 1.5 VDC 225 NIA A -6 VDC 30 MA radios (earphones supplied), tuners, or wireless f Trans. in a .vuterpmnf plastic care wfspace for bait. or por: er rupply. Telescoping antenna 8 ft. llar pee. intercoms. No technical knowledge is needed. loading Boll. Complete .v/tuber. antenna, 2 crystals PT.243 Ina choice of freq.) headphones. carbon micro- Step-by-step instructions are in each package phone. chive. cover. A manual. Size: 8x8x I, ?IA-. Wt.: 8 Ibs 59.95 and only a soldering iron and diagonal cutters ' 0AV' MODEL-Same As above. but with direction finding e l e, eD loop plywood are necessary for assembly. At distributors or and Ilr mfr.. care re/straps. Size: 1401083" . `l A t 017 VIBRATOR Power Supply f/MAR & DAV. Operates from 8 VDC 4 A write to EICO, 283 Malta St., Brooklyn, N.Y. NT.6 Batt or other power sourer. 81rzx334x141.'. 2 lbs. New .86.93 Dry Cttarg. SAttery N -T81 f/above power supply. a VDC 4 A.. 11207. .53.95 Prices P.O B. Lima. 0.-25 t Deposit on COD's-Address Dept. 3A BIG FREE CATALOG-Write for your ERIE ropy nowt

Set Your Head for Hi -Fi FAIR RADIO SALES 1016_E. EUREKA Box 1105 LIMA, OHIO 45802 Pioneer Electronics has brought out an im- pressive -looking headset in an elegant black How Scotch -grain, satin -lined box for the low tab to Write a of $29.95. Model SE -30 is stereo, and has Classified Ad That Pulls washable, comfortably thick ear cushions. Deluxe 48 page booklet-only $1 per copy. And, with the booklet, you get a $2 towards Highly -styled in black, white. credit your and chrome, the payment of your classified ad in RADIO -TV EXPERI- set has a frequency response of 20 to 20,000 MENTER. Send $1 now to RADIO -TV EXPERIMENTER, Hz. Obtainable from local Pioneer dealers, or 505 Park Avenue, New York, New York 10022. write: Pioneer Electronics, 140 Smith St., Farm- ingdale, N.Y. 11735. - TRANSISTORIZED CONVERTER KITS $5.00 EACH Three kits available. Marine 2-3 mc, police h fire, high hand 100.200 mc, low hand 26-60 mc. 1 me tuning on car radio. Full instructions. ANY MT $5.00 pp. WIRED $15.00 pp. FRED MESHNA, NO. READ NG, MASS. 01864

, 'r Keep up to date with SCIENCE & MECHANICS Science & Mechanics- the only magazine that keeps you right up to Pioneer Model SE -30 Stereo Headset date on developments in space technology, The State? Solid! The Sound? Stereo! weapons, automobiles, The 1968 Knight -Kit Model KG -980 50 - medicine, boats, planes, watt stereo -FM receiver is designed to include tools, new products, and exciting world top features in the state of the art at a mass - events. market price, $149.95. The KG -980 uses all - Keep up to date. Make sure silicon transistors and has transformerless driver of your home delivered copy and output circuits, so there is virtually no hum by returning the coupon today._ SCIENCE & MECHANICS RTVE-268 I 505 Park Ave., N. Y., N. Y. 10022 ... 12 issues 54; 24 issues $8; 36 issues $12. (Foreign: Add $1 a year.) I _e'r:'ri Please enter my_year(s) subscription. I "' I $ Q enclose - 13 Bill me. l N ame (P1ºare Print) Address City State & Zip Knight -kit Model KG -980 Stereo -FM Receiver

FEBRUARY -MARCH, 1968 39 NEW PRODUCTS****r******************r*************tr****<

is or distortion. Frequency response within Thrown for a Looper 1 dB from 18 to 30.000 Hz. The FM tuner has A very handy tool for the hobbyist is the LID a 4 -stage front end, including two RF stages. L' LOOPER, which forms a loop on jar lids, Circuit automatically switches to stereo and allowing them to be hung on a wall. Large an indicator light goes on when a stereo sta- enough to slide onto a pegboard hook or 8 -pen- tion is tuned. The critical FM front end and ny finishing nail, the loop is easily formed by IF sections are factory -assembled and aligned. placing the lid between the handles of the Other features: precision tuning meter, speaker LOOPER and squeezing. Such a loop is capable muting switch, tape monitor, front -panel stereo of supporting 50 pounds. At the quite low price headphone jack, and positive -action rocker -type of $2.50, you get the LID L' LOOPER by writ- switches. Inputs include magnetic phono, tape ing to Dahl Enterprises, Box 708, Hawthorne, monitor, and auxiliary (ceraniic phono). At all Calif. 90250. Allied distributors, or you may request Cata- log No. 270 for more dope on the KG -980. Allied Radio Corp., 100 N. Western Ave., Chi- cago, Ill. 60680. t Be Scotch With Your Stickum go,R "Scotch" brand electrical tape now comes in .,,. .. . . a fully -enclosed tape dispenser. Designed ,. plastic d j ' for electrical, household and marine applica- : : tions, the rigid plastic dispenser is reusable and i.._t.:M t gives permanent dust and edge protection to Dahi's L' Looper in action (left) t the enclosed roll of tape. The dispenser has a Results are shown at right! flat bottom so it won't roll and a recessed sharp - tooth cutting bar. Each dispenser holds 60 feet Be a Square and Make Waves of 3/4 -in. "Scotch" black vinyl plastic electrical tape No. 33. At dealers everywhere for $1.49; At the very reasonable price of $75.00, the quantity lots available in 12 -roll displays and in Knight -kit Model KG -688 Sine/Square Wave 24 and 48 display units. For further info write Generator will provide a signal source for all Dept. E17-39, 3M Co., 3M Center, St. Paul, kinds of electronic equipment: audio amplifiers, Minn. 55101. transducers, sonar and supersonic apparatus, servos, video frequency circuits and low radio - frequency equipment. Sine wave frequency range from 20 Hz to 20 MHz includes the en- tire AM broadcast band. The square wave fre- Si"

li _ I ,1. .. ; :

.» ...... ' ll

M gYNA . r.. , tlf o

Knight -kit Model KG -688 Sine/Square Wave Generator , quency range is from 20 Hz to 200 kHz. The ti i KG -688 uses all silicon semiconductors with an FET (field effect transistor) in the Sulzer oscil- lator circuit. Operators will like the 6:1 ratio a planetary -ball, antibacklash vernier drive and "Scotch" No. 33 Electrical Tape the convenience of a detachable line cord which

90 RADIO -TV EXPERIMENTER rirw******* *********ir*****ir**fs

can he stored when not in use. The cool -running POPULAR SAMS BOORS instrument measures a mere 73--s x 73/4 x 1014 in. Power requirements: 100-1311 V. 50-60 Ilz AC. Available from Allied Radio Corp., 100 N. Western Ave., Chicago, Ill. 60680.

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Ave., Garden City, N. Y. 11530. Trsnslstor Ignition Systems Handbook, 20235 52.95 TV Tube Symptoms 6 Troubles. 20476. 1.95 Urderstanding Telemetry Circuits. 20516 3 25 2ndClass Lisense Handbook. 20316 4.75 Modern Dictionary of Electronics. 20151 7.9S Handbook of Electronic Tables 6 Formulas. 20230 3.95 Color TV Trouble Clues. 20120 1.95 Solving TV Tough -Dogs. 20403 3.25 FAMOUS ABC'S BOOKS Lawn 4 Masen. 20262..... 51.25 0 Computers. 20011. 0250 Tape Recording. 20395...... 1.50 0 Boolean Algebra. 20055.. 2..25 Transistors. 20440 2.25 Modern Radio. 20047 1.95 I -HOWARD W. SAMS 8 CO., Order from any Electronic Parts Distributor, or mail to Howard \V. Sams & Co., Inc., Dept. R r -i I II 430(' W. 62nd St., Indianapolis, Ind. 46268 Send books checked above. $ enclosed. I ,,,.,./ Send FREE Sams Book Catalog. Name eLIAsr rainr tk r Address "Oh, don't worry! His bark City State Zip is worse than his bite."

FEBRUARY -MARCH, 1968 41 Not New, but Great! When a book comes up for its Seventh Edition, this of Bookworm looks upon it as an old friend that's found the Fountain of Youth. Practical Electrical, Wiring by H. P. Richter has been completely revised and updated to conform to the latest National BY BOOKWORM Electrical Code. The text, designed as an in-. as PRACTICAL C:1 This of Bookworm is working hard. So many good books are being published that the ELECTRICAL Editor said, "Okay, give some extra coverage." WIRING u,. 11.,a..w,RRr«x But then he has to be nice to me, because he goofed in the last issue. Get all the facts from his editorial "Positive Feedback" on page 21. Hard cover Amps Amplified. m Many audio fans and ex- 594 pages perimenters want to enjoy the pleasure of design- $8.50 ing and building their own audio amplifiers from the ground up, and the or Bookworm is no ex- struction manual, enables the reader to learn ception. To do this, we need more than an ex- electrical wiring in a practical fashion, for planation of how an audio amplifier works. We homes and farms, well as as'for industrial and . need a practical understanding of audio equip - commercial structures, schools, and churches. Using a logical step-by-step procedure, from principle to method to execution, the author tells not only how to do things, but also clearly AUDIO, explains why. AMPLIFIER Practical Electrical Wiring consists of three DESIGN : parts: Fundamentals of electrical work, termin- ology, basic principles, theory; wiring of resi- dential buildings and farms; wiring of non-resi- dential buildings. Major topics covered include theory, basic principles, measurements, power factor, transformers, circuits, overcurrent de- Soft cover vices, wire sizes, connections, joints, grounding, 160 pages switches, wiring methods, lighting, motors, ap- $4.25 pliances, power plants, and factories. N ost hook stores will carry this valuable text ment design and a simplified method of arriv- and reference book. If you can't find it, write ing at the numerical values of the various com- to McGraw-Hill Book Company, 330 W. 42nd ponents. Audio Amplifier Design, by Farl J. St., New York, N. Y. 10036. II Waters, fulfills these needs in a "one -book de-' sign course" showing how to design amplifiers Zeners Again. A completely new Zener Di- from a single stage to a complete, multi -stage ode Handbook has just been published by stereo system. Motorola Semiconductor Products Inc. This Each stage of an audio amplifier is first dis- handbook supplies applications information for cussed in theory; then design methods are illus- the widespread product advances in zener di- trated by working an example to show how component values may he determined. Finally, ,_%I:NMK a design problem is tackled and solved. A ó. feature that will appeal to those who find 11N/111s. mathematics distasteful is the generous use of .11it\UINII/K nomographs throughout the hook. With these, problems can be solved merely by laying a straight edge across appropriate values and reading off the answers. Copies of Audio Amplifier Design are avail- able from electronics parts distributors and Soft cover bookstores throughout the country, or from the Spiral bound publisher, Howard W. Sams & Co., Inc., 4300 191 pages W. 62nd St., Indianapolis, Ind. 46206. t/ $2.00

42 RADIO -TV EXPERIMENTER TAKE A BREAK...AND odes and zener-like devices. It covers applica- PICK UP THE 1968 tions for temperature compensated zeners, reference standards, current regulator diodes. CB YEARBOOK NOW! and zener transient suppressors as well as the latest types of zener diodes. Just $1 at your The handbook is organized to give the circuit local newsstand or designer all the data necessary for the efficient ask us to send you use zener components with the major empha- of a copy! sis on circuit design. Proven, basic circuits are also provided as take -off points for the designer's own requirements. You may find your next project diagrammed in this text. Chapters important to the experimenter in- zener clude information on zener diode theory. Sao.* characteristics, applications, and a cross refer- ence -selector guide for zeners. of is available from 136 Pages The Zeiler Diode Handbook chit-chat franchised Motorola distributors or the Tech- great CB nical Information Center. Motorola Semicon- RTVE-268 ductor Products Inc.. Box 13408, Phoenix. CB YEARBOOK 505 Park Avenue 85002. 11 Arizona New York, N. Y. 10022 me a copy of the 1968 CB Yearbook and Quickies, a Yeah! Send t,a By the Numbers. Mathematical make it snappy. Enclosed find $1.25 to keep the mall - diverse and intriguing collection of problems. room boy in fish -n -chips. offers a double challenge to the math puzzle Name enthusiast. The author, Charles W. Trigg, Dean Emeritus. Los Angeles City College. has for Address over thirty-five years been familiar to the read- Zip ers of the problem section of various mathe- City. State matical magazines. He has published over 600 articles and problem solutions and has pro- in domestic posed over 300 challenge problems Hours of "How -To" Fun and foreign mathematical periodicals From his collection of over 16.000 problems he has se- For Pro & Novice Al- lected 250 for the inclusion in his book. NEW 1968 though the prohlems are interesting in their own right, the emphasis is on the method of solution. ELECTRONICS HOBBYIST thereby challenging the reader not only to solve ANNUAL the problems, but also to devise neater. quicker, more elegant solutions than those provided. at your newsstand January 1 1 th The problems involve elementary concepts in Now you can reserve the newest, most exciting maga- zine for those whose interest in electronics is on the hobby level. The ELECTRONICS HOBBYIST con- tains easy to build, tested and proven construction projects of every description. FOOLPROOF DESIGN! EASY CONSTRUCTION! Each construction project has been carefully re- searched and tested by experts. Each article is com- plete with theory, construction tips, parts lists, dia- grams and photos. RESERVE YOUR COPY NOW!

THE ELECTRONICS HOBBYIST 505 Park Avenue / New York, N.Y. 10022 RTVE-268 Please reserve my copy of the 1968 Electronics Hobbyist Annual. Enclosed Is $1.25 which includes postage and ban -

Name

Address City State Zip

FEBRUARY -MARCH, 1968 43 BOOKMARK

Can't the fields of arithmetic, algebra, plane and solid geometry, trigonometry, number theory, and find general recreational mathematics, such as dis- sections. cryptarithms, and magic squares. A variety of methods of solution are employed- the some conventional, some unorthodox though

CNAXI.6SN.:ram key cglatóematical to Quickes electronics? Hard cover - then get your electronics cool with 210 pages this introductory offer to the two leading electronics magazines! Use coupon: mathematically sound-but the same special r technique is seldom used in more than one solu- DAVIS PUBLICATIONS, INC. RTVE-2 tion. Since part of the challenge in solving prob- 505 Park Avenue/New York, N.Y. 10022 lems is to identify the most appropriate mathe- matical discipline to use, the problems have Yes! I want to find the key To electronics. not been segregated by field. The order of diffi- Begin my subscription to both RADIO -TV EX- culty varies from the very simple to some that PERIMENTER and ELEMENTARY ELECTRONICS will challenge the graduate student. Difficult at your special low -subscription rate of $7.00 problems are interspersed with easier ones Bill me later. Check enclosed. throughout. Approximately one third of the solutions and many of the problems are new. Name Mathematical Quickies is divided into two sections: The first consists of challenge problems Address consecutively numbered; the second contains the quickie solutions correspondingly numbered. City State Zip vice versa (Outside U.S.A. & Canada add 51.50 pstge. & hndlg.) Passage from problem to solution and is facilitated by the problem titles and the dic- tionary style page headings. The problems are Now, both of these fine magazines will clearly and concisely stated and illustrated - where this will facilitate understanding. be delivered to you at the special sub- Check your local bookstore for this book or scription rate of just $7.00... save $2 write to McGraw-Hill Book Company, 330 W. from newsstand price. 42nd St.. New York, N. Y. 10036. 11 ELEMENTARY ELECTRONICS The magazine that serves up electronics theory in pleasant spoonfuls and reinforces the knowledge you gain with 3 exciting and useful projects. Dorm ..t :

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44 RADIO -TV EXPERIMENTER What A Way To Earn A

By Gene Lyons "Now!"

"Well, with a list that long, your TV "Enough is enough! Will you please needs a mortician, not a technician!" get that new technician a tube caddy?"

to replace that "Look, lady, when I work on this model, "Oh yeah, I've got I always bring my lunchl" shorted electrolytiic capacitor."

FEBRUARY -MARCH, 1968 45 Success in Electronics t- Comes as Naturally as Grantham School of Electronics 2-68-RT 1505 N. Western Ave., Hollywood, Calif. 90027 1-2-3 Please mail me your free catalog, which explains how Grantham training can prepare me for my FCC License and Associate Degree in electronics. t understand no salesman will call. through Education There they are - three big steps three deliberate Name - Age steps which lead directly to success in electronics. Your future is shaped by the moves you make - by Address the steps you take. Begin now with Step =1. City State Zip STEP 11 is a simple request for full information on the Grantham Associate Degree Program in Elec- tronics. You take this step by filling out and mailing the coupon. We mail our catalog to you; we do not send a salesman. STEP =2 is earning your FCC first class radiotele- phone LICENSE and radar endorsement. You com- plete this step in the first two semesters of the Gran- tham educational program (by correspondence or in residence). Train with the school which gives associ- ate -degree credits for your license training, offering you the opportunity to advance beyond the FCC license level to a college degree in electronics. STEP is earning your ASEE DEGREE. This degree is conferred when you have earned credit for all five semesters of the Grantham curriculum.

Semesters 1 and 2, as mentioned above, are of- fered by correspondence or in residence. Semester 3 is offered in residence, or students who have extensive practical experience in electronics may receive credit for this semester - credit based on that experience. Semester 4 is offered by correspondence or in residence. Semester 5 is offered in residence.

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the degree of tion without obligation.

Associate in Science in Electronics Engineering

wads all the helm, and pirik,.. Jh,rvned.ry.namin¡. In .nn,s du, d.rsan. July .Dad has Earn h.ued ,he S,hwi Adm.nndrad, hY n u,n n,wmmfrdafiun d,k laulry ar dM ti.hod m sans Grantham School of Electronics sdYr 192,1 1505 N. Western Ave. 818 18th Street, N.W. _21 2 ".:11.1.1,,, Hollywood, Calif. 90027 or Washington, D.C. 20006 e i/-tr ...^. d... Telephone: Telephone: (213) 469-7878 (202) 298-7460

46 RADIO -TV EXPERIMENTER Rddio-TV RUARY-MARCH EXPERIMENTER "Down with California kilowatts!" squeak the QRPers. Their argument: Peanut Whistles Spell a= Progress

By Robert M. Brown, K2ZSQ

What's that? Talk halfway around the world with a peanut -whistle rig? Preposterous as this may seem, hundreds 'of low -power ham ad- dicts are doing it every day-and to the corjfoundment of their - watt counterparts. Using in most instances only a single transistor or tube in the final of a home-brew transmitter, these chaps are rack- ing up contacts all over the U.S., not to mention Britain, Germany, Czechoslovakia, and even . Key to this organized underground is challenge. In a world where just about everything is hell-bent on high 'power, these fellows- many of them in their teens-pride themselves on their operational skill and knowledge of propagational techniques. Kilowatts? Who needs them! "If you're a polished operator who knowshow to pull signals out of the noise level, you're halfway there," argues famed low -power addict W3RZL. Up With QRP! Known in ham circles as "that crazy QRP crowd," the scattered group of die-hard anti -power enthusiasts insists that Federal Communications Commission is respc nsible for the whole thing. And well it may be. For hidden amongst paragraphs of regula- tions pertaining to amateur radio in the U.S. is a clause which states that "only so much power as is necessary to establish contact shall (Continued overleaf.)

FEBRUARY -MARCH, 1968 47 Peanut Whistles

be used by'participating stations." Of course, everyone knows that this clause runs unen- forced, but the flea -power boys have formal- ly adopted it as their motto. "Down With California Kilowatts" and "Switch To QRP" are more than mere slogans to the peanut - whistlers! Another argument is the very definition of QRP itself. One of a series of Q -signals, this , -r three -letter combo is used as an abbreviation for "Decrease Power" or "Must I Decrease Power?", depending on whether it is fol- lowed by a question mark. Like the other Q -signals used extensively in CW work, it makes for quick transmission of common- t; place messages; it also eases communicating with a foreign counterpart who might not understand if everything 'were spelled out. But the fact that QRP is included at all in the official International Q -Signal List con- 1+rilt!'1 vinces the low -power crowd that flea -power u is more than an integral part of hamming- ,._ it's a worldwide movement! 2 In With The Best. To add insult to injury, the low -power enthusiasts are constantly chalking up real names for themselves. News spread like wildfire when a certain 5-watter in Mozambique managed to work all Conti- nents on 20 meters during one ten-hour stint. Others have embarrassed technicians time and again by shifting to the bands above 50 MHz and piling up rare states and counties using a bare minimum of RF output. Even more incriminating (so far as the rest of hamdom is concerned) are the stag- gering totals these fellows rack up during on -the -air Sweepstakes and VHF Contests. In recent years, nearly every coveted ham award (Worked All Continents, Worked All 3 States, Worked All Counties, etc.) has been picked up by at least a few very -low -power hams bent on "destroying the myth that you need 500 watts to call yourself a radio amateur." Actually, under a kind of unwritten inter-

1-Check, check, and recheck again! Flea - power mobileers, a rapidly growing group, delight in constantly retuning their trunk - mounted rigs for maximum signal output. 2-Typical ORP enthusiast uses minimum of «1Rf equipment. The secret? Operational skill. ;.,.a;;,,N r a is . ' 3-Basically phone setup, this shack of QRPer Ken Bourne, K9GHR, Lombard, Ill. -:%arY:;

48 RADIO -TV EXPERIMENTER national agreement among hams, anything under 100 watts to the final of a transmitter can technically be referred to as QRP. And indeed when QRPism was in its infancy it abounded with 90-watters and the like who delighted in setting themselves off from the rest of the hobby by proclaiming "Up With QRP!" This, however, was short-lived. To- day, top-eschelon flea -power addicts pride themselves in the latest state-of-the-art gear -much of it involving not mere transistors, but such devices as field effect transistors (FETs) and linear integrated circuits (ICs). Power levels generally run under one watt to the antenna. And while the 75- and 90- watters are still around, QRPdom's undis- puted leaders are the semiconductor experi- menters and propagational experts. Flea Heroes. To the uninitiated, the "bible" of flea -power hamming is something called Antennas, a thick book written by John Kraus which deals exclusively with the problems of antennas and related subjects. Hard-core QRPers quote Kraus as frequently as today's in -crowd talk about Marshall Mc- Luhan, devoting every waking hour to still another interpretation of what Kraus really means about low angles of radiation, 11 - and the like. Lv. 411.11.111 degree Yagi tilts, iii" iii¡ To understand this devotion to a hero, you relies yíyi must first realize that a flea -power ham iii'eii....Mt ltYqp almost entirely upon his transmitting/receiv- ":si3S is 11:. ing antenna for his success. The antenna MIy his mark upon the world (to say nothing of -t-:---i. his neighborhood). His ham shack abounds ¡..f, with feedline indicators, neon bulbs, scratch paper with such jottings as "34 wavelengths = 10,645 feet," and the almighty SWR meter. -4r To compare Kraus with standing waves would be like talking about Henry Ford and gas mileage all in one breath. But the plain is 4 fact is that achieving a perfect 1:1 SWR to a QRPer what getting 32 miles per gallon is to a Volkswagen owner. Maximum effi- ciency and energy transfer to the antenna are bywords that are all-important to the low - power boys, and the less wattage that is gen- erated, the more crucial these factors be- come. If you're willing to settle for a 1.5:1 4-Believe it or not, you're looking at WA2FSQ/WB2DIE's 22 -turn helical array, a 41- formidable circularly -polarized radiator that would make the most devoted VHF flea - power addict's mouth water with envy. With 20 dB of gain, who needs a kilówatt? 5-What those Europeans won't try! The rig: Alps. a 1 -wafter. The site: the Austrian 5 49 FEBRUARY -MARCH, 1968 preted and publicized the wonders of a so- phisticated receiving technique known as Peanut Whistles synchronor s detection, presently finds him- self receiving piles of mail from low -power hams who want to know how they can im- SWR or couldn't care less about multiple - prove their receiving setups. wavelength feedlines. you'll never cut it with Unfortunately, Katz tends to talk in graphs this crowd. and formulas, spouts such things as "equal- Second only to Kraus and his fervent ization techniques" and "opposite pulsing," group of rooftop followers is the Ultimate and generally requires interpretation by Reception Society, an informal group of learned persons adept at translating engi- QR Pers who insist that "you can't work 'em neering advances into ham -type practicalities. if you can't hear 'em." These devotees will Understandably, then, anyone who can spend $3000 on the latest in a solid-state authoritatively quote Katz will most certain- communications receiver with product de- ly he invited as a guest speaker at the next tectors, automatic noise cancellers, and pano- club meeting. In interviewing K2UYH for ramic adaptors, yet invest perhaps $13 in this article, however, we found the man per- their transmitter. Unlike the antenna people, sonable and enthusiastic about his work and this group has no permanent leader, though eager to pass on his findings to QRPers. it tends to adopt certain favorites as the "What everyone seems to be forgetting," state-of-the-art advances. he states emphatically, "is that ultimate re- Recently, for example, the boys URS are ceiving equipment is still no substitute for a turning to Allen Katz, K2UYH, for guidance truly skilled operator." How many hams and direction. Katz, who innocently inter- (Continued on page /27)

TWO SIMPLE RIGS FOR QRPing PARTS LIST ANT B1 -9 -volt battery C1-30-pF trimmer capacitor 3.711MHz Q1 -2N416 transistor CRYSTAL R1 -91,000 -ohm, 1/2 -watt resistor RFC I R2 -2,000,000 -ohm potentiometer RFC1-2.5-mH RF choke 1-key

One of smallest rigs going (above, right), B1 this simple 80 -meter job works with any standard cut KEY crystal for 3.5- to 3.8 -MHz R2 000C CW band. Below, flea -power 21 -MHz DX 2t4EG rig is equipped for both phone and CW; crystal can be any 15 -meter, third -overtone BIAS ADJUST type.

21.21MHz PARTS LIST R1 CRYSTAL B1 -9 -volt battery C1 C1-4700-pF capacitor a70OPF C2-30-pF trimmer capacitor C3-30-uF, 15-VDC electrolytic ca- pacitor CARBON C4-1000-pF capacitor MIKE C5-5100-pF capacitor L1-17 turns of 88W #3007,

R3 C4 tapped 8 turns from bottom -,500.a 1000 Q1 -2N374 transistor PF 81 R1-1 1,000 -ohm, t/2 -watt resistor 9VDC_ R2, R3 -500 -ohm, t/2 -watt resistor KEY 11ltl 1-key (also acts as on/off switch on phone) 1-carbon microphone

50 RADIO -TV EXPERIMENTER COVER STORY -MITE ..pt, .. r¡R

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By HOWARD S. PYLE, W7OE

QRP?' An expression rapidly becoming popular in the dedicated Ham circles of low -power transmitter enthusiasts to describe flea -powered rigs ... less than 10 watts input. And along with mini -cars, mini -skirts and the general trend to "mini" this and "mini" that, QRP Ham rigs are taking their place in the field of "Now you see it-now you don't." Our little Mini -Mite really takes the cake with 15-, 20-, 40-, and 80 -meter amateur CW bands instantly switchable from the front panel. The rig is adaptable to any type Of an- tenna with no external matching units or similar gimmicks to fool with, and it provides instant choice of internal power source or external supply! In other words, nuuchuin en parvo, or something like that, which, in the Italian language is supposed to mean "much in little." And all in an enclos- ure only 4 x 4 x 6 in. Want to hop on the QRP wagon? Mini -Mite Autopsy. Let's play surgeon and start with the internal organs: they are as vital to Mini -Mite as the heart and lungs in a human. Unlike the human, however, this little jewel has four hearts; each a complete transmitter in its own right. Basically, these "hearts" are the recently introduced of -

FEBRUARY -MARCH, 1968 51 parently these were designed solely for test MINI -MITE ()RP oscillators with no thought of their com- munications possibilities. ferings of the International Crystal Manu- But with an input power of 1.2 watts using facturing Co., and are known as the OX Os- a 6 -volt DC power source, and up to 1.8 cillator Kit. Each is a self-contained tran- watts with a 9 -volt supply, the author has sistor oscillator mounted on a neatly let- confirmed contacts of 1100 miles on 15 tered printed circuit board only 11/2 -in. meters, 600 on 20 M, 300 on 40 M and 200 square! These are available for any fre- miles on 80 M. That's bad? quency you want within a range of 300 to Making Mini -Mite. It will take 60,000 you about kHz. twenty to thirty minutes to assemble Fundamental and crystals are used on all fre- solder each kit from the simple instructions quencies-you use can your own crystal or supplied. The four little units are then International's EX type-the choice is yours. mounted on an aluminum sub -panel as shown Each complete oscillator kit costs but $2.35, in the photos. For those who want to dupli- which includes the transistor, printed circuit cate the mechanical essentials of Mini -Mite, board and all components except the crystal. included is a dimensioned drawing of the We stole a march on International as ap- sub -panel. This is really all the mechanical

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st, v:._ S6 t S118 -PANEL St . 61 .1rEa iL, ". 41 - t,i-,':. e S5 ° ,. rS4 osct f Fs -1'.. , OSC3 , ..,`!-" s t J2 J1 ..- -....- , _._ _ i ! wrun+u lnh. aC - OSC4 4M Mi "».*, µrµ ^.. . .0 . u IijNllAl+

Jl J6 J3 15 J4

A glance at schematic (above, far right) re- veals that Mini -Mite actually consists of four separate oscillator assemblies (O5C1 through 05C4) powered by a single battery (Ill). As photos show, oscillators and battery are mounted on sub -panel, balance of compo- nents on chassis box itself. Detail of alumi- num sub -panel appears in drawing.

52 RADIO -TV EXPERIMENTER 1/4 I -in. spacers cut from -in. cop- detail needed as any type of enclosure can he panel with acorn nut on each end of the used and any parts of the non -critical type, per tubing. An rod holds the whole assembly firmly such as switches, connectors, etc., that your threaded 9 -volt transistor battery, junk -box may produce can be substituted. in place. The little as the internal power supply, is For these, you can easily work out your own which serves -panel between the two component placement and drilling templates mounted on the sub boards. Incidentally, these to match. Mounting screws and metal spac- pairs of oscillator last quite a while since current ers are furnished with the oscillator kits, so batteries will and this, of course, is no problem there. drain is only 20 mA down" condition. By using a sub -panel, wiring is perfectly only in the "key lets you take Mini -Mile straightforward and there's little of it as the The battery supply hunting, fishing and camping schematic indicates. Make all the internal with you on with home base. Taking connections you can before securing the sub - trips to keep contact extra batteries along just to play panel to the enclosure. In the prototype, the a couple of is a good idea if you're making an ex- sub -panel is mounted with four 11/2 -in. it safe lengths of 8/32 threaded brass rod (most any tended stay. When using Mini -Mite at hardware or Ham supply house carries it). QRP Power. conventional rectified AC The sub -panel is spaced from the front the home base, a

1.1 OSC3 OSC4 COAX Schematic of Mini -Mite. I ..-r RF RF J3® Switch SI selects any of FEED OX -LO OX -HI 6V four amateur bands - THRU 27 METERS 15 METERS 15, 20, 40, or 80 meters. S BUSHING 6500 GO°

J4 J5' J6 J7

Is to Ic PARTS LIST B1-9-VDC transistor battery OSC1 (Eveready 216 or equiv.) o GND-, C1-100-vF variable capac- GNU S1A 6V itor (Lafayette 40C2885 or 6V OX -LO equiv.) OX -LO O1 20 40 80 METERS C2-.001-uF, 600-VDC ca- 40 METERS 1! RF pacitor RF 10 1534 D1 -1N34 diode S16 MI INT á C2 J1, J2-RCA-type phono BATTERY 81 EXT.POMER a jock, insulated mounting 6-9VDC , Y' cc1 y --=1 JACK 2.52nH á J3-Feed-through connector, 0 / S5 J1 20e' insulated (Lafayette 33C- e or equiv.I T KEY JACK Is ¡ 3201 connector, 50-239 I SIC - 14, J5, J6, J7 -75 -ohm coax 11s J2 (Radio Shock 278-201 or equiv.) TEST .34171 BUTTON L1-Loading coil, 72 turns #28 enameled wire on 3/5 -in. form 5 IN. M1-Field-strength meter (Shurite 8903Z or #30 DRILL (16 RED.) 1x1 IN. CUTOUT } IN. equiv.) (available from 5hurite Meters, Box TYP. 1} IN-- (2 REQ.) 1818, New Haven, Conn. 06508 at 54.50 postpaid) Osc. 1, 2, 3, 4-OX oscillator kit, 3 OX -l0, Crys- 1 OX -Hl (available from International 1'-,-,INI A B tal, 10 N. Lee, Oklahoma City, Okla. 73102 I I of S2.35 ea. postpaid) -pole, 4 -throw single deck rotary switch Lt.. - 3 IN. 5I -3 -- (Lafayette S2 -5 -position, 1 -pole rotary switch ro- -0 30C4013 or equiv.) #27 DRILL-- 53, 55-D.p.d.t. rotary or toggle switch - I I 54-S.p.s.t. rocker or toggle switch 56-S.p.s.t. normally open pushbutton switch

I I la 275-008 or equiv.) _OJO (Radio Shack pp - Misc.-Wire, solder, 4x6x4-in. sloping -panel chassis box, decals, etc. 518 DRILL(4 RED., º, z li IN. BATTERY STRAP

53 FEBRUARY -MARCH, 1968 MINI -MITE characteristics. Accordingly, incorporated QRP right in the Mini -Mite cabinet is an all -band L/C loading network that has proven most supply can be used to conserve the battery. effective. Rather than build a little power box, the Not only has this L/C combination per- author used a Radio Shack 22-023 regulated, mitted resonating a random wire of reason- variable -voltage transistorized DC power able length but has also proven to be of supply. This makes a perfect noticeable companion unit value when used with a frequency - for Mini -Mite and will serve equally well as conscious dipole or other conventional an- a power supply source for experimental tenna. transistorized equipment. This supply pro- Robust Radiation. Provision is also made vides up to 20 VDC at 200 mA with excep- for switching the antenna tuning capacitor tionally smooth control, is and more than in series with the loading inductance or in adequate for most transistorized gear. parallel across it, by means of a d.p.d.t. tog- Equipped with a meter that reads both volts gle switch. The inductance is and adjustable in milliamperes, it makes a convenient way four steps by tapping the coil to check your and connecting power input instantly. Selec- the taps to a 5 -point rotary tion of switch (single either the internal battery power or pole). By choosing the the external proper amount of AC source is accomplished by coil inductance in combination a d.p.d.t. rocker with the vari- switch on the rear panel. able capacitor in either series or shunt Note that Mini -Mite con- is equipped with four nection, proper loading of the antenna cir- coax connectors and a feed -through insulator cuit is easily obtained. for antenna connections, all in line on the The coil consists of a total of rear panel. 72 turns of This you can take or leave. It #28 enameled wire wound happens the on two 3/8 -in. author has four dipoles (one for diameter ,forms (wooden dowels), each band) and 36 turns preferred to leave Mini-Mite on each. Splitting the coil makes it semi -permanently possible connected at the home to fit it comfortably into the available station, hence the space. four coax connectors. Since the halves of the coil are Any Old connected in Antenna. The feed -through in- series, it is in effect a single sulator provides for inductance. connection to any ran- Taps were taken at approximately dom length antenna equal for portable operation. distances along the length of the winding. The s.p.d.t. rotary switch in the top center of The meter is a desirable asset in tuning the the rear 'panel, labelled COAX and RAN- antenna network and a resonant condition is DOM, permits switching any oscillator out- indicated by the highest reading. This peak put to the feed -through insulator or to the will be fairly broad but will vary from about series of coax connectors. The band selector quarter to half full scale reading on the switch on the front panel has orie section meter selected, depending which on the input volt- selects the appropriate coax connector age from the power source. for the band selected. The meter used is a A special field strength second section on the band selector meter made by Shurite. If switch not available from connects the positive lead from the local supply sources, it can be power source to ordered direct- the oscillator assembly used ly from the manufacturer (see Parts List). for that band. The negative voltage is applied From the foregoing description, it should only when the hand key or test button is be simple to work up a reasonable facsimile pressed; the power source, of course, re- of our Mini -Mite and enjoy a heretofore mains idle at all other times. The third sec- relatively unexplored and exciting field. tion on the band selector switch selects the There's a great deal of excitement in trying RF output terminal on the desired oscillator for the amazing results possible with an in- and connects it'to the radiating circuit. put power considerably less than that re- While the oscillator functions on the quired for a conventional radio dial lamp! fundamental of the crystal with no tuning We suggest that in your initial efforts in the adjustments, it does not necessarily mean QRP field, first establish local contacts to that the most effective loading of the antenna get the feel of mini -power. will Once you've automatically result. This is particularly mastered the simple QRP techniques, you're true when a random - -length wire antenna is ready to demonstrate what the QRP Ama- used ín portable operation. Therefore, a teur Radio Club International often use as means of resonating the to antenna the load an unofficial slogan ... "POWER is no sub- will assist in getting maximum radiation stitute for SKILL!" Go to it, and good DX! 54 RADIO -TV EXPERIMENTER .eo. .b2~ Short Wave for Nbfl-SWL'S

By Thomas R. Sundstrom

Today, one problem of the beginning new and used receivers are available, and shortwave listener (SWL) is that he's con- almost anything is better than the 4 -tube job. fronted with a confusing mass of information Older receivers can be an excellent buy concerning equipment and stations to he since the previous owner may have traded heard. Also, though these beginners express one in just because he wanted a new model. a serious interest in SWLing. many soon fall Watching the classified ads in the local news- by the wayside when their results fail to paper may turn up a used receiver faster than match the seemingly tremendous reports waiting for one in the local radio store; check turned in by some of the old pros. out all the possible sources. Thé beginning listener shouldn't be dis- If you do purchase a used receiver, contact couraged, since many of these top DXers the local radio amateur club to determine have spent many years accumulating knowl- who services communications equipment (or edge and experience of what to look for and look in -the telephone book). Normally, it is when. not a good idea to trust service work to the Another problem is that many listeners average local radio -TV repair shop, as most start SWLing with relatively inexpensive re- are not equipped to solve the problems pe- ceivers, mostly those selling for less than $75. They often fail to realize that a 4 -tube gen- eral coverage receiver that lacks an RF stage; selectivity provisions, a regulated power sup- ply and other DX boosting circuitry just will ,, not, under any circumstances, perform as well as an I8 -tube giant that retails for $450. Of course, when conditions are right, a small receiver can do wonders. For example, the author heard the Radio Nacional de España outlet on 684 kHz in Madrid, Spain one winter morning when 680 and 690 kHz were quiet. This was on the standard AM band and the receiver was a 4 -tube clock radio! DX Dollars. Of course, if the new listen- er is willing to invest just a little more money, One way to get started SWLing is with a he will find an excellent selection of receiv- homebrew regen receiver like this one. These ers in a price range of $100 to $250. Both sets often produce surprisingly good results.

FEBRUARY -MARCH, 1968 55 familiar with your receiver and you can use Shortwave the crystal calibrator accurately, you are ready to go to work on locating some real DX. for Non-SWLs Beginning listeners often just tune the culiar to these communications receivers. shortwave bands at random and increase their You may find that a used receiver could total stations and countries heard by chance. use minor realignment and calibration before But, if you plan your listening, much more you start using it. The service man should be can be accomplished. The organized ap- willing to discuss your prospective purchase proach requires some basic SW information and give you an estimate of cost involved. as well as some means of updating the ma- Launching An SWL. To get the novice terial. headed in the right direction, there are some For those who prefer to tune the SWBC preliminary items that ought to be men- bands, the SWL bible is the World Radio -TV tioned. First, the receiver must have some Handbook, published annually in Denmark. degree of accuracy in spotting specific fre- This volume contains a complete listing of all quencies in order to be much good at locating stations in the world, including desired stations. schedules, addresses and reams of other help- If the receiver does not have a crystal cali- ful information. It does not cover U. S. and brator built into the set, it would be very Canadian stations broadcasting on domestic

Knight Star Roamer

Heathkit GR-64 Hallicralters S-120 n-. i

m.i°} [ .r.{,,,: -am s..rr.- . ' Af.t ^T. >r.. LrF.' ...Lti-.mod au Are .r . 1:

Lafayette HA © -e -63 I" _...'- `- j © ys ., -_...... a ..s 0_4 Q .J oJ A wide selection of receivers selling ... for less than $75 are available for the would-be SWL. Typically, these low-cost . e ._.-- R all -band receivers are a multi -band version ..- of the all-American four -tube AC/DC table radio, though some use t . Y o power transformer.

useful to purchase a separate unit. These can (AM, FM and TV) frequencies, but these be had either in kit form or assembled; check can be found in White's Radio Log. The the receiver manual to see if your rig has World Radio -TV Handbook costs $5.95 provisions for one inside the set before get- from Gilfer Associates, Box 239, Park ting an outboard unit. Virtually all crystal Ridge, N. J. 07656; ask about the Summer calibrators are I00 -kHz units, but the crystal Supplement, too. can easily be changed to a 500 -kHz unit Ham Band Listening. If you are inter- if your receiver cannot separate the closely ested in the amateur bands, pick up one or spaced 100 -kHz signals. both Radio Amateur Callbooks. Both are With A Calibrator. By setting the main published quarterly, and may be obtained in dial to the same point (one for each band) almost any electronic supply house selling determined by the calibrator's marker signal amateur radio equipment. The first callbook appearing every 100 or 500 kHz, depending lists all the amateurs in the United States on the crystal used, the same frequencies will ($5.95) and the second lists amateurs else- appear at the same bandspread dial settings where in the world ($3.95). each time you tune. Calibration graphs or To up -date SW listings and other informa- tables can be prepared for receivers having tion, White's Radio Log and SWL club bulle- a 0 -to-100 bandspread dial. Once you are tins are the best sources available. There are

56 RADIO -TV EXPERIMENTER HE -30 Realistic OX -ISO Lafayette

,-,.,., y,+r-- ,Rcevc.r4'Y°:'v`:'-ct : National HRO S00 +s.1 y F ,Ci..aMy.,,,. -^-....- ..--._ . 1. ºf;, (j,3 f O J 1 a 41° O'er O

The over -a -hundred dollar receiver will provide additional features, depending on price, that ensures the maximum in Hertz -snatching DX.

Associa- several fine SW clubs in the United States, The North American Short Wave and they have members from all over the tion (NASWA) has a very fine SWBC-only world reporting each month. The Associa- bulletin. This club has grown rapidly in the tion of North American Radio Clubs last few years after changing from an all - and well- (ANARC) is an organization of clubs: club hand format. News is current representatives work together to better the lot of the SWL. Those clubs in the ANARC that have bulletins covering the SW field are the Newark News Radio Club, the American A very useful item Short Wave Listeners Club, and the North for the SWL, American Short Wave Association, among this low-cost others. crystal calibrator Clubs For SWLs. The Newark News Ra- is available * from Allied Radio dio Club is the oldest SWL club in North L"1 =0-' in 1927. in kit form. America, having been established WSW C.1.111«" Its monthly bulletin covers both SWBC and _ amateur DXing. as well as broadcast hand, R utilities, FM and TV. A sample bulletin may he obtained for 25t from the Newark News detailed. Write for a sample bulletin (250 Radio Club, 215 Market St., Newark, N. J. to William P. Eddings, NASWA, Box 989, 07101. Altoona, Pa. 16601. Incidentally. LeRoy Waite, NNRC ama- Another good club is the American Short teur editor, works with Rod Newkirk of Wave Listeners Club (ASWLC) that began QST's column "How's DX?" Almost any operations in 1959. it, too, at one time dealt amateur will have this magazine-perhaps with all aspects of DXing, but in recent years you can borrow a copy to check the latest the ASWLC has specialized in SWBC and amateur news. utility band DX. For a sample bulletin

A , ;

,

Many avenues are open to the SWL with a Another possibility for a low-cost/high- limited budget, such as this listening performance purchase for the beginning SWL post equipped with vintage receivers is an ancient communications receiver obtained for next to nothing. like this old Hammarlund 110-1 29-X.

57 FEBRUARY -MARCH, 1968 Shortwave for Non-SWLs (250, write to The Publisher, ASWLC, 16182 Ballad La., Huntington Beach, Calif. 92647. C. M. Stanbury II, whose articles fre- quently appear in RADIO -TV EXPERIMENTER, ny.-_.1Nw is an editor of this bulletin. `r` h.. i How can the beginning listener use all this -. ;¡u..,-._rsT^^s's= -7..._.4 information? It's really quite simple. The 5...-r n. .r+' -1. . secret of a good session at the dials is organi- . ;=:1+ .,.l . .: [Rt . (. . v zation. e- ss °s'yi,-. .pdtslµtd! sh; rS Planning Your -.,...T wM. Catches. 1 Examine the ' .r . 1 V- - 1. schedules of the stations in the countries you would like to add to your log. In the World Radio -TV Handbook you will find this in- olnlamw formation, as well as the stations' frequencies Some of those great old multi -band consoles and slogans. Note anything peculiar about are still around and can be had fora song. Look at the QSLs bagged with this stations you want to bag. Compile another one. list from recent club bulletins, and check impossible to hear the station you want, skip conflicts with the notes made from the it for that day and go on to the next station WRTVH. Unless the reporter made a mis- on your list. If you check each day, you are take, the bulletin's information can usually bound to find conditions ripe to bag that be depended on. elusive one. Arrange your listening notes by time. Hav- When tuning the amateur bands, you have ing this information, you can tune your re- a slightly different problem. Obviously, Hams ceiver to the best frequency-determined by do not adhere to schedules and wander in Propagation Forecast in this issue-ahead of transmitting frequency. However, there are time, then just fine-tune the receiver when various expeditions to remote areas or coun- the internal signal opetting the program be- tries of the world that may have a Ham or gins. If the frequency you chose is not yield- two along and they sometimes announce pre - ing a good signal, refer to your notes and planned transmission schedules and frequen- select another frequency. cies. Check QST for these; later, other ama - If reception conditions are such that it is (Continued on page 130) t.4 +? ' . «..r....'.,N...y_ ` ..4;i . ..._. i` f .2;.. r ., O o /LS., m .,...... mO ° r. RARtO ; w:'.,,.. AMERICAS ...,.. .ma...,.n".,. , a ,..: F RADIO STATIU(V li.*t\ 11 -'.''''''f"' t _ .,_ . noty, r_ -.,...... 41,,,....d.-_-==_; ,-.-.1i W2NSB Y''.' I+ 'Ikon Sb`lNd4rn 1l4 ,,(urr 1:nual F, ¡;-,_-.....: , 1" ` fl-w iia+'r.;' r+}- METUCHEN. N. J. , ti i., r ati ~ vl.r Wp

Commercial shortwave broadcasters all over the world are more than anxious to send the SWL a Q5L card verifying reception; here are a few samples of what to expect.

58 RADIO -TV EXPERIMENTER 3 IJ - DOS WE WONDER AT

FOR SPACE

Oversized tinker -toy makes mock up moon -jaunt for earth -bound spacemen '. Lovely to behold, this clever device will give our spacemen lots of much -needed practice in the noble art of space -walking, m which is somewhat different from other kinds. The setup here is a sort of simulator that approximates the conditions of weight- lessness. If after carefully looking over this gadget, you're still a bit dubious about its value, don't be. At $280,000 it's a steal!

: . . r FOR INDUSTRY How five million little data -bits ti went to Marlboro Country 1' Some sneaky scientists went and put five million bits of computer data on a piece of film in a container much ..I like a pack of smokes. But caution: it may still be hazardous to your .. . FOR HOME Brotherhood, fraternity, and summer tang in winter fruit ft If you thought that bread in every basket and copper -tone appliances in every kitchen were the standard bearers of the really Great Society, Is

think again. It turns out that the mark .ti of technological progress 'actually comes to us under the unassuming name of Gro -Lux. This end-all solu- tion to everyone's problems puts cheer in your soul as it puts a healthy summertine glow on pale winter fruits placed in the bowl. How 'bout that!

FEBRUARY -MARCH, 1968 59 GB ,i Moonshine.

By C. M. Stanbury 11

It takes all kinds of people to make up the 11 -meter band and I had to go tangle with the pea picker whose QSL card was as choice as his daughter!

"This is the Mountaineer calling, Moun- old mountaineer so taineer good is because of my calling CQ. Anybody hear me out compressed modulation. there?" Watch what hap- pens when I spread it out to normal." He pinned my S -meter as I snaked along My needle dipped. A road sign ahead 17 on the East bank of the said Seven Creek. I swung off the highway Kanawka River. Several times I'd worked hard -top onto a gravel one laver which led up him from California on skip, but now, here out of the valley. Rumor had it that the old I was, right in the old man's back yard. boy's QSL was something special, like solid Mountaineer came back, and completely gold maybe, or even some kind of a hillbilly swamped channel 2. "I hear you New York. Mona Lisa. If you hear this old mountaineer, send him He returned my needle to the pin. "You a QSL card." Like the FCC didn't exist. see what I mean. And I build these little "Just send it to the Mountaineer, Seven gadgets myself. They're my own Creek, West invention." Virginia." Paused for breath. "Sell em, There were postpaid. for actually four guys from New 35 dollars cash." Big York trying deep laugh. "Course to work him. I'll take a money order, too." I passed through a spot called Piny. which His "compressor" was an obvious fraud. is right across the river from Buffalo. It was All the old man did was push his power up his QSL that. brought me. I had sent him a couple of hundred watts. Otherwise, ít three of mine, one after each of our QSOs, wouldn't show on an S -meter. Of but the mails had course, brought nothing back there's another rumor that says unless from Seven Creek. you buy one of his "compressors," you don't He was on again. "Reason you hear the (Continued on page /31) 60 RADIO -TV EXPERIMENTER By Thomas R. Sear, WA6HOR

Two -Timer '11

°, Get You Trácés My by. the. twos

Everyone agrees that the oscilloscope is by The operation of Two -Timer is straight- far the most useful and versatile instrument forward. Referring to the schematic dia- available for use by engineers, scientists, gram, the initial stage (VI) is a twin -triode technicians, or hobbyists. With an oscillo- vacuum tube used as a balanced free -running scope, one can measure voltage, frequency, multivibrator with a frequency of approxi- phase relationships, time, etc. You may not mately 15,000 Hz. The -wo multivibrator think that such an all purpose device could square -wave outputs (taken from the plates easily be improved on. However, for the of VI ) are 180 degrees out of phase; i.e. electronics hobbyist the oscilloscope is not all when one output is + (positive) the other is that it could be. - (negative), and vice versa. These two High-class oscilloscopes used by electron- out -of -phase outputs are coupled to the key- ics personnel in such places as calibration ing stages (V2A and V3A) via C3 and C4, laboratories, repair shops, radar installations, and are applied to the grids. etc., are equipped with a special feature that The keyer stages are the triode sections of almost doubles their usefulness. These in- triode -pentode vacuum tubes V2 and V3, struments have a dual -trace function that and are used as cathode followers. The out- permits simultaneous observation of two puts of the two keyer stages are direct - different signals with different amplitudes coupled to the cathodes of the signal ampli- and frequencies. fiers (V2B and V3B), and maintain the You can equip your own modest single - phase relationship of the multivibrator out- trace oscilloscope with this same unique puts. function for a few pucks and half a dozen The keyer stages outputs alternately turn hours of construction time, and almost the signal amplifiers on and off at the multi - double its usefulness. Our Two -Timer de- vibrator frequency (15,000 Hz), and in scribed here is easy to construct, and no accordance with the multivibrator output's fancy adjustments are necessary. phase relationship; i.e., when V2B is turned The Circuit. Two -Timer's circuitry con- on by V2A, and is passing its input signal sists of a multivibrator (VI), two keyer on to the electronic switch output (l3), stages (V2A and V3A), two signal amplifiers V3B is turned off by V3A, and is not passing (V2B and V3B), and a full -wave solid-state its input signal on to the output. This con- power supply. The entire unit is contained dition is reversed 15,000 times a second. within a 3 x 5 x 7 -in. chassis box, which re- This means that the signals applied to the quires little area on your workbench, and control grids of V2B and V3B áre sampled uses only three vacuum tubes. 15,000 times each second, and alternately

FEBRUARY -MARCH, 1968 61 Two-Timer'll Get You Traces By the Two's applied to the electronic switch output from amount of signal applied to each amplifier jack J3. and, therefore, the amplitude of the output Electronic Switch. The signal amplifier signals. R13 controls the DC levels of the input signals are applied to the control grids two traces provided by the electronic switch (pins 7), and come from the electronic by controlling the relative amounts of screen switch INPUT A and INPUT B gain con- grid voltage applied to V2B and V3B. trols (R16 and R17), which control the out R13, the two output signals would he

J1

GAIN A 2INPUT A R7 A_ C7 47K V2B 2WATT V2A }6AW8A s VIA +6AW8A

}12AX7 Cl C2 i I C3 2l R16 500K

6 R10 65 10 33K CAUTION: R6 8+ J3

R14 R15 OUTPUT 1 I SEPARATION 10K 2WATT 2WATT 1-4121J4 V3A V3B }6AW8A °6AW8A / O5

R8 INPUT 8 33K 2 . Z R9 6.8K J5 GAIN B R17 500K T1 00006 ó 125VAC o N.C. o-- I r 05 L1 r C6 612 S1 e 125VAC 25K 25mA 10,tF /01IF 10WATT

117 V3 VAC t

Schematic of Two -Timer shows straightforward approach to obtaining dual traces on a conventional single -trace scope. Unit is basically a high-speed electronic switch. PARTS LIST FOR TWO-TIMER Cl, C2-27-pF, 1000-VDC capacitor R12 -25,000 -ohm, 10 -watt resistor C3. 200-VDC C4-0.05-uF, capacitor R13 -250,000 -ohm, 1 -watt potentiometer with C5-10-uF, 450-VDC electrolytic capacitor s.p.s.t. switch Si C6-20-uF, 450-VDC electrolytic capacitor R14 -10,000 -ohm, 2 -watt resistor C7, C8-.001-uF, 1000-VDC capacitor R15 -22,000 -ohm, 2 -watt resistor D1-400-PIV, 50-mA full -wave bridge rectifier S1-S.p.s.t. switch (part of R131 J1, J5-Binding posts, 3 red, 2 black (Radio T1-Power transformer, 117 -VAC pri.; 250 - Shack 274-736 or equiv.) VAC, 25-mA and 6.3 -VAC, 1-A sec. (Allied L1 -7-H, 50-mA choke (Allied 5481408 or 54B2008 or equiv.! equiv.) V1-12AX7 tube R1, R2 -47,000 -ohm, t/2 -watt resistor V2, V3-6AW8A tube R3, R4 -470,000 -ohm, 1/2 -watt resistor 1-Chassis box, 7x5x3 in. (Radio Shack 77- R5, R8 -33,000 -ohm, 1/2 -watt resistor 0685 or equiv.) R6, R9 -6800 -ohm, 1/2 -watt resistor 3 -9 -pin miniature tube socket R7 -47,000 -ohm, 2 -watt resistor Misc-Wire, solder, knobs, rubber feet, line R10, R11 -100,000 -ohm, 1/2 -watt resistor cord and plug, etc.

62 RADIO-TV EXPERIMENTER Ti

JI J2 J5 R16 R17

---- .. ,ato ..L ti . (-71 ,

lam

/ 1 1'' I o : . 11 . .® C6

R 13 J3 J4 V2 C5 V1 V3 Most of circuitry is located on sub -chassis If Two -Timer will see much continuous duty, which mounts the three tubes. Nothing in holes should be drilled in cover above circuit is critical and variations can be made. and below tubes to preveit overheating.

superimposed at the electronic switch output. Construction. In constructing the Two - By adjusting the DC levels of the signal Timer electronic switch, the positioning of amplifiers outputs, any desired amount of the components is not critical. While the trace separation on the oscilloscope screen author chose to enclose all parts of the elec- can he ohtained. tronic switch within a box, an open chassis The DC level of each signal amplifier out- could be used at the discretion of the builder. put is modulated in accordance with the The best procedure to follow is to determine applicable input signal during the time that the physical location of each part first. Then that particular amplifier is turned on for that drill the applicable holes and mount the tube "hit" of the signal output. Therefore, each sockets, transformers, potentiometers, etc. time a signal amplifier is turned on the DC Finally, wire the circuit. This procedure level of its output will have changed slightly precludes damage to the electrical compo- as determined by the character of the input nents when working the chassis. signal applied to the control grid. The DC Operation. When the electronic switch level changes, or lack of them, will be dis- is assembled, it is ready to use. No adjust- played by the oscilloscope as a representation ments are needed. But be careful since the of the input signal, and is composed of output terminal J3 always has a potential of 15,000 "hits" per second. This chopping of approximately 270 VDC when the unit is the signal into "bits" is the main limitation energized. Therefore, the output terminal as to the highest frequencies that can he must never he shorted to ground, and don't viewed using the electronic switch. As the grab hold of it either. frequency increases, the signal will he com- When using Two -Timer for the first time, posed of fewer "hits" of DC level changes, and to perform a preliminary test of opera- and the display will not he an accurate repre- tion, set the SEPARATION control fully sentation of the signal applied to the input counterclockwise until the integral switch of the electronic switch. For example, a sig- "clicks" and turns the unit off. Then connect nal with a frequency of 500 Hz is composed the electronic switch output J3 and J4 to the of about 30 "bits" of information; at a fre- input of the oscilloscope. Adjust the oscillo- quency of 1000 Hz, this drops to about 15 scope controls to obtain an AC coupled in- "bits," and at a frequency of 5000 Hz, about put, and a slow -speed trace. 3 "bits." Since most hobbyist activities are Connect the line cord to the wall socket, at relatively low frequencies, the electronic and adjust the SEPARATION control clock- switch should prove to be quite adequate. wise to midrange. Allow the electronic

FEBRUARY-MARCH, 1968 63 Two-Timer'll Get You Traces By the Two's switch to warm up for about a minute, and same signal can he connected to both inputs then adjust the SEPARATION control to for testing purposes). obtain two traces about one inch apart on A good voltage source for the preliminary the oscilloscope screen. It may he necessary test is the filament voltage of the electronic to decrease the oscilloscope vertical sensi- switch tubes. Adjust the electronic switch tivity to keep both traces on the screen at GAIN A and GAIN B controls to obtain the same time. Now connect an input signal approximately the same signal amplitude on to each of the electronic switch inputs (the both traces. It may he necessary to adjust the oscilloscope sweep controls to obtain a stable display of Typical Dual Scope Traces the desired number of cycles of the signals. This verifies correct operation of Two -Timer. It is now ready for use. Amplification factor Familiarity Breeds Usefulness. Once of stage can be de- you have twisted the termined by ampli- knobs of the oscillo- JMt Í tude differences. scope and Two -Timer sufficiently to become `;ir1.11:. . familiar with the interaction of the combina- ii111íi tion, your imagination is the only limiting factor to usefulness of the dual -trace com- bination. You can observe the phase relationship Phase relationship of between a reference signal (the input to a two signals being hi-fi compared - signals amplifier. for example) and' signals at are 180° apart. any other point in the circuit, measure ampli- fier gain, compare frequencies of signals (using the 60 -Hz house current as a refer- ence; your oscilloscope is a very accurate frequency meter), etc. Because of the Signal at input (bot- amplification of the input tom) and output (top) signals-approxi- of detector stage in mately seven times with the gain controls an AM radio. fully clockwise-you can observe signals with less amplitude than your oscilloscope could "see" before. With no signals applied to the inputs, Two -Timer provides a very - - c ` good square wave output, with variable Signal before (bob amplitude (controlled by adjusting the torn) and after (top) going through clipper SEPARATION control), for amplifier test- circuit. ing. Two-timer will permit viewing of signal frequencies up to 5000 Hz, but works best if the signal frequency is 1000 Hz or less. Here's Two to you!

Tiny as a Thumbtack, Dazzling as a Dodo Bird A lamp said to he ideally Lr; . - suited for photocell and in- dicator applications also hap- pens to he a lamp quite un- like the kind most of us are used to. Reason is the new lamp is all solid-state, which means its filament is no- where to be seen. One of the growing family of light - emitting diodes, the device was developed by General , !. Electric and answers to the name of SSL-6. .. .. - 1 s.ii ,, 64 RADIO -TV EXPERIMENTER CBS'S

I

.-- C}:0,11"

104= F.L

J Surprise of the decade, a it's a play -only device using neither magnetic tape, motion picture film, nor even thermoplastics!

By Jorma Hyypia

The day may come when you will slip a can of Sophia Loren, Charlie Chaplin, or even Hamlet into your supermarket shopping cart. When you get home, you will dump the can into a "breadbox" near your TV set, settle down with a TV dinner, and enjoy an orgy of re -runs that you can now savor only during the summer TV doldrums. More- over, you will view re -runs of your own choice rather than be captive to selections made by broadcast programmers. Columbia Broadcasting System's new Electronic Video Recording (EVR) system brings the era of canned video a step closer, though it is by no means certain whether EVR will be the system that eventually be- comes standard for home use. At first, EVR will be used for educational purposes; the #- earliest full-scale application will be in England. Video cartridges and players won't be available world-wide until late 1969, per- haps 1970. EVR is not a magnetic video tape system. And it can not be used for self -recording of broadcast or other material, only for play -

FEBRUARY -MARCH, 1968 65 CBS's ELECTRONIC VIDEO RECORDING. .SYSTEM TELEVISION MAGNETIC MOTION PICTURE CAMERA TAPE FILM OR OR 4)

INFORMATION

ELECTRON BEAM RECORDER

RAW STOCK EVR MASTER

EVR electron beam recorder takes program from TV camera, magnetic tape, or film and generates a master which can be in either color or black and white.

EVR MASTER

RAW STOCK I HIGH-SPEED MULTIPLE r I 'PRINTER EVR CARTRIDGES High-speed multiple printer produces multiple copies from EVR master. One ` twesty-minute film can be reproduced in approximately thirty seconds.

back of films already containing program a single scene-a feat that isn't possible with material. present magnetic video systems. The educa- Operating the unit is deceptively simple. tional advantages of this feature are obvious. The user simply places the special film car- A teacher can hold a single scene as long as tridge into a "breadbox"-size playback unit necessary to add his own comments. A coupled to a TV set's antenna terminals. The golfer can pass slowly from one frame to cartridge automatically threads itself, plays the next to study the swing of a pro's golf the recorded material through the TV sys- club in detail. And -the viewer of ordinary tem, rewinds, and is ejected. story -telling motion pictures will surely find Initially, the films will contain educational many a scene that, for one reason or other, material suitable for classroom and related he would like to linger over and observe at purposes. But at least one Hollywood film length. studio is already exploring the possibility of Electro -optics System. Both the prepara- making EVR films from old motion pictures. tion of the film and its playback involve the This could eventually lead to home as well use of optics and sophisticated electron as classroom playback of motion pictures. physics. In the factory, an optics -electronic EVR is unique in that the playback can be process is used to transfer program material stopped at any time for prolonged viewing of from a motion picture film or video tape to

66 RADIO-TV EXPERIMENTER EVR CARTRIDGES

tff~mtot , I

EVR ELECTRO- ACQUIRE CARTRIDGE OPTICAL AND RELEASE LOADER TRANSDUCER: REEL

ELECTRONIC SIGNAL

TO TELEVISION SET ANTENNA TERMINALS

.

STANDARD HOME TELEVISION RECEIVERS Electro -optical transducer-probably some sort of flying dot scanner-reads cartridge to produce video and sound, which are then reproduced on one or more TV sets. J

a special unperforated film, 8.75 millimeters Secret Process. CBS officials and tech- wide. This master film is used to run off nicians are sitting on their EVR breadbox, copies for purchase of EVR customers. Such jealously guarding their hard-earned secrets copies are packaged in cartridges 7 in. in from competing companies. Still, it is a diameter and t/z in. thick-about the size of virtual certainty that any astute electro -optics a standard reel of magnetic tape. expert can make pretty shrewd guesses about EVR film has two separate tracks. if both the workings of EVR. But even they aren't are used, a single cartridge can hold up to talking, for sound competitive reasons. one hour of black -and -white programming. So far, CBS has mainly revealed what Both tracks must be used simultaneously to EVR is not, rather than what it is. EVR is produce color pictures; one track contains not a magnetic tape system. For though luminance, the other chrominance informa- the film has visible images produced by some tion. Unlike ordinary color motion picture sort of photographic process, they are not film, EVR color film appears wholly black - created by such orthodox photographic and -white to the eye; however, this ostensibly methods as the use of light-sensitive silver monochromatic information can be trans- compounds. Nor are the images produced lated into full -color images by the playback by the action of laser light or infrared light unit. on heat -sensitive plastic, though this would

FEBRUARY -MARCH. 1968 67 Next, consider the extremely rapid repro- duction of playback films from the master TAPELESS TV RECORDER tape. CBS says that one 20 -minute program can be printed in approximately 30 seconds by a high-speed multiple printer working theoretically be a workable possibility. from an EVR master film. On playback, the , CBS isn't passing out samples of film for EVR film moves at a speed of 5 inches per analysis, but it is probable that the images second, hence the 20 -minute film must be on the film are not recognizable as specific about 500 feet long. objects. In other words, if the film were But to be printed in 30 seconds, this film placed into a movie or slide projector, no must zip through the processing system at a recognizable images would be seen on the speed of over 16 feet per second. Moreover, projection screen-only coded patterns (per- the printing time is expected to be cut down haps in the form of micro -dots) that might to 13 seconds within a year or two! No

a

I Man behind new CBS tapeless t TV system is also the man responsible for launching of first 331/3 -rpm microgroove disc way back in 1948. Presi- dent and Director of Research for CBS Laboratories, he is Dr. Peter C. Goldmark, shown here examining a bit of the super -secret EVR film that makes the new video playback system possible. Either black -and -white or color pro - `gram material can be packed into extremely narrow film.

represent a cat, a house, or Sophia Loren. ordinary photographic process involving de- The electro -optical transducer in the play- velopment and fixing can yet do that. back unit is able to decode this audio and What seems to be used, then, is some sys- video information into an electronic signal tem that quickly produces an image on the to produce recognizable images on a TV film by optic (not mechanical) means and screen. Amplitude -modulated light, produced then desensitizes the film to prevent further from the film by a flying spot scanner, is image formation. amplified by a photomultiplier. This signal Photochromic Process? It is conceivable is converted to a video waveform that is that CBS may be using photochromic tech- used to modulate a TV carrier frequency. niques which have been actively researched Jiggling the Breadbox. If we shake the by many companies in recent years. A large EVR hreadbox-or rather, the limited in- number of colorless organic chemicals (such formation available about it-we can begin as spiropyrans) become intensely colored to hear some meaningful rattlings that just when exposed to light waves in or near the might give a hint about the nature of EVR ultraviolet region of the spectrum. These film. chemical dyes can also he treated to make Attention is most profitably focused on the them insensitive to light. nature of EVR film and how it is made. Thus it would seem possible that the EVR First hear in mind that the images are proh- printing process may make use of photo - ably coded data hits representing video and chromic dyes supported on the plastic film. audio information. It is easier to cram this The light patterns projected from the master kind of information into small film space film may the coded images on the film than to accurately record the same data in by causing the dye to darken wherever the he form of continuous tone photographs as light strikes it. The unchanged dye remain - in the case of ordinary motion picture film. (Continued on page 132)

68 RADIO -TV EXPERIMENTER 10 Reasons why RCA Home Training is your best iñvestment for a rewarding career in electronics!

LEADER IN ELECTRONICS the one best for you and check it off on UNIQUE TUITION PLAN 1 TRAINING the card. 9 You progress at your own pace. RCA stands for dependability, integrity SPECIALIZED ADVANCED You only pay for lessons as you order and pioneering scientific advances. For 5 TRAINING them. There's no long-term contract or over a half century, RCA Institutes, large For those working in electronics or down -payment to lose. Even if Inc., has been a leader in technical with previous training. RCA Institutes you decide to interrupt your training. training. you don't lose a single cent. offers advanced courses. Start on a RCA AUTOTEXT TEACHES higher level. No wasted time on mate- 1 O RCA GRADUATES GET TOP 2 ELECTRONICS FASTER, EASIER rial you already know. 1 REZOGNITION Beginner or refresher - AUTOTEXT, PERSONAL SUPERVISION Thousands of graduates of RCA Insti- RCA Institutes' own method of Home 6 THROUGHOUT tutes are now working for leaders in the Training will help you learn electronics All during your program of home electronics field; many others have their faster, easier, almost automatically. own profitable businesses proof of study, your training is supervised by ... high 3THOUSANDS OF WELL PAID RCA Institutes experts who become the quality of RCA Institutes training. JOBS ARE OPEN NOW personally involved in your efforts and RCA Institutes can help you qualify for help you over any "rough spots" that SEND ATTACHED CARD TODAY FOR a rewarding career if you have an inter- may develop. FREE DESCRIPTIVE BOOK est in electronics. Every year, thousands VARIETY OF KITS, YOURS TO KEEP of well paid electronics jobs go unfilled All courses and programs 7 At no extra cost, a variety valu- just because not enough men take the of approved for veterans under able specially kits with new G.I. opportunity to train themselves for engineered come BIII. these openings. your program-yours to keep and use on the job. CLASSROOM TRAINING ALSO AVAIL WIDE CHOICE OF CAREER ABLE. FREE CATALOG ON REQUEST FROM RCA INSTITUTES, INC. 4 PROGRAMS NO SALESMAN WILL CALL. 8 TRANSISTORIZED TV KIT AND Start today on the electronics career of VALUABLE OSCILLOSCOPE Dept. RX-28 your choice. On the attached card is a RCA INSTITUTES, INC. All students receive a valuable oscillo- list of "Career Programs", each of scope. Those enrolled in the TV pro- 320 West 31st Street which starts with the amazing AUTO - gram or courses receive the all -new New TEXT method. Look the list over, pick York, N.Y. 10001 Transistorized TV Receiver-both at no extra cost and only from RCA

ACCREDITED MEMBER NATIONAL HOME STUDY COUNCIL

Transistor experiments The Most Trusted Name In Electronics on programmed breadboard - using oscilloscope.

Construction of Oscilloscope. Construction of Multimeter.

. I 5 1 a ,_. ..

FEBRUARY -MARCH, 1966 71 By C. M. Stanbury II Propagation Forecast February/March, 1968 With the approach of the Spring equinox, Pacific during the early a.m. hours. But in DXers can look forward to a steady improve- this department, listeners on the West Coast ment in Southern hemisphere signals on ap- have a decided advantage over the rest of us. propriate hands. During the early evenings, Until the noise level begins to rise, they can watch for Brazilians on 60 and 90 meters as expect regular reception from S. Pacific well as Argentine and Chilean regionals on islands during the early a.m. period down on 49. After midnight, R. Altiplano at La Paz, 60 and 90 meters. Generally, the lower the where Bolivia, will often be good on 5045 kHz hand an SWL can work from a given area, Incidentally, they seem to operate all night. the more the DX counts. Pacific Coast if you should hear another station on 5044 DXers will also he in a good position for (just I kHz below R. Altiplano), and can Asian reception. make out what they're saying. it will prob- And in conclusion, now is the time to ably turn out to be rare R. Cook Islands. 49 41 meter stations in Unfortunately, the latter signs off around u atch for 60, and and 0300 EST. such places as Mozambique, Rhodesia We have listed 41 and 49 meters as the the now famous Botswana (BBC 4845 kHz, best bands for DX reception from the South S/On 2300 EST).

" r _.: ' t°°;:` °,RAD(O=TV; EXPERIMFNTER...PRQPAGATION.FORECAST

EUROPE, . Feb./Mar. 1968 NEAR EAST LISTENER'S ASIA & AFRICA - AFRICA - SOUTH - ', LATIN , STANDARD (except (N. of the (S: of the AMERICA - ,TIME Near East) Sahara) - Sahara) PACIFIC - M 0000-0300 25 31(41, 49) 41, 60 (49) 25, 31 (41) 49, 60, 90

0300-0600 25 (41, 60) 31 31(poor) i 41, 49 49, 60, 90

0600.0900 16,19 19 (25,16) 19 31 31, 49

0900-1200 16,19 16,19 (13) 1.9 25 (poor) 31

1200-1500 19 (poor) 16,19 (13) 16,19 (25) 25 (poor) 25 (19)

1500-1800 19; 31 25, 31 (49) 25, 31, 60 19,16 31

1800-2100 19, 25 25, 31 31 16,19 49, 60, 90

2100-2400 19, 25 -25, 31 41, 60 (49) 119, 25 49, 60,90 '

To use the fable put your finger on the region you went to hear end log, move your finger down until it is alongside the local standard time at which you will be listening and lift your finger. Underneath your pointing digit will be the shortwave band or bands that will give the best DX results. The time in the above propagation prediction table is given in standard time at the listener's location which effectively compen- sates for differences in propagation characteristics between the East and West coasts of North America. However, Asia and the South Pacific stations will generally be received stronger in the West while Europe and Africa will be easier to tune on the East coast. The shortwave bands in brackets ere given as second choices. Refer to White's Radio Log for World -Wide Shortwave Broadcast Stations list.

72 RADIO -TV EXPERIMENTER w for Lucky Bored By Michael Wilson DXers

If you're looking for new DX territory to Nagasaki, ). We are listening for calls conquer on that SW receiver, here is an in- (QSX) on the 8 MHz band. Out." Some troduction to what's probably the hottest stations will use a series of Vs, or dots, or utility DX band under the present sunspot just the letters "DE".. derived from the conditions: the 13 MHz marine band. French word for "from." Here one can find dozens of countries Markers By The Hour. The marker waiting to be logged, and the renowned signals are sent repeatedly, often for hours ability of CW to bite through the noise on end, with breaks for traffic (messages) where phone fails is indeed evident. from ships calling the station. Most coastal Recently, the author connected his old stations sport three -letter callsigns (ships S -38B SW receiver to a pair of TV rabbit usually have four), and sometimes a num- ears and went for a quickie tour of the hand, ber follows the call letters. which stretches from about 12.5 to 13.2 QSLs from these stations are a little MHz. The result? Thirty countries in one harder to collect than those of shortwave evening! Now add a good dipole and a pre - broadcasters. First, you must not repeat any selector for the band and imagine how the me'ssage broadcast in actual traffic with an- countries scored will mount up! other station (e.g. ship -to -shore). Marker The only trick necessary is to be able to signals can be repeated, for they contain no copy code. And since most of the signals information other than the advertisement of here are taped marker signals, giving the facilities as they compete for traffic from stations' call letters repeatedly to ships at ships. sea, code should not pose as much of a Second, you must usually prepare a QSL problem as might he imagined. Here is a card yourself which the station operator can sample of the marker signal used by many quickly fill out and return. of the stations: CQ CQ CQ DE JOU JOU Tnird, always include return postage. If JOU QSX 8 MC K. you don't know the exact location of the This roughly translates as "Calling all sta- station, other than its country of registry, tions, from (DE) JOU (the coast station at address it C/O Ministry of Posts, Tele-

. : Y ! ,= ..: '`. «+".::= . Everyone is familar with r 0. . that speediest of passenger - liners, the U.S.S. United a States, yet many is the SWL who has a so never logged ?'l her or her sister ships. lv'"R^,'- oi Most readily picked up -e71íi . t , by DXers along the Eastern Seaboard, the United States can i be heard most anywhere. Shown here is her radioroom.

FEBRUARY -MARCH, 1968 73 1,,,,---- , MH Li Luc , , ..---- . -t`'= =,Mti

=

___1,...... ,2_- .., Coastal Station WMH in 1.,_r "r Baltimore is one of o series of stations oper- ated by the Radiomarine Corp. (see table below). WMH transmits on 12885 kHz and can be readily logged, given a little per- sistence and patience. phones and Telegraphs in the country con- there are other bands to try, too, with more cerned. If this fails, try writing in care of of the same and perhaps some other new that country's Navy. countries. If your receiver has an RF stage, Pep -Up Chart. With these pointers in give the 17 MHz band a try, or even the 22 mind, check the chart for a list of some of MHz band. Otherwise, tune down between the stations in the 13 MHz band. Some fre- 8.5 and 9 MHz, or even lower to 6.2-6.5 quencies are approximate and are marked MHz. by an X. The thing to remember is that if you ever This can be your start in the fascinating get bored with standard SWBC DXing, there world of marine station DXing. After you is fantastic and almost endless variety on gain familiarity with the 12-13 MHz hand, these marine utility bands.

COASTAL STATION FREQUENCY CHART

Frequency Operator & Frequency Operator & Call Call (kHz) Location (kHz) Location

13123.5 WL0 Mobileradio 13015 x WAX Tropical Radio Tel. Mobile, Ala. Hialeah, Fla. 13114.5 KFS Mackay Radio 13002.5 KPH Radiomarine Corp. Palo Alto, Calif. Bolinas, Calif. 13110 x GYR Royal Navy 12993 KOK Mackay Radio Lascaris, Malta Artesia, Calif. 13110 x NST U.S. Navy 12980 x CFH Dept. of Transport Londonderry, Gander, Nfld. N. Ireland 12970.5 WOE Radiomarine Corp. 13101 OHS Government Lantana, Fla. Rugen, E. Germany 12952.5 VIS5 Overseas Telecomm. 13095 x HKA Government Commission Barranquilla, Colombia Sydney, Australia 13092 JOU Government 12948 WSC Radiomarine Corp. Nagasaki, Japan Tuckerton, N.J. 13075 x CLA Government 12943.5 ZLP5 N.Z. Navy Havana, Cuba Wellington, N.Z. 13069.5 TFA Gufunes Communi- 12930 x VHP Australian Navy cations Centre Canberra, Australia Reykjavik, Iceland 12925 x CKN Canadian Navy 13038 KLC Mackay Radio Aldergrove, B.C. Galveston, Texas 12898.5 DAN Funkamt Hamburg 13033.5 WCC Radiomarine Corp. Norddeich, Chatham, N.J. W. Germany 13024.5 WSL Mackay Radio 12894 6WW Navy Amagansétt, N.Y. (ex-FUWI Dakar, Senegal 13015 x IAR Government '-Ships calling coastal stations x-Frequency approximate Rome, (Continued on page 129)

74 RADIO -TV EXPERIMENTER By Charles D. Rakes

1111111Cm

Novel checker draws a picture of all about a transistor you'll ever want to know.

Dynamic Duo is a perfect name for our 1 he collector current is limited by R4, and dual -trace transistor characteristic curve the base current is adjustable with potentiom- tracer. With this simple tester you can ad- eter R8 and limited by R6. Assuming both just and observe two le/V,.,, curves of the S2 and S3 are closed, diodes 1)9 and DIO same transistor on a scope simultaneously. isolate the base of the transistor from the And from this dual trace you can determine positive voltage at the cathode of 1)3. Under AC current gain (Hr), ideal base current these conditions the curve tracer will produce for linear operation, and leakage current one 1c/VCe trace on an attached scope. (hp). You can even match transistors for The second trace, as shown in the photos, amplifier applications. Sound complicated? 'is produced in the same way but during the Not at all. remaining half -cycle of the 60 -Hz current. The techniques employed to obtain the The base current during the second I,,/V, two curves are not difficult to understand, curve is adjustable by potentiometer R7. as we'll see shortly. What's more, switching Pushbutton switches are provided so that the from pnp to npn transistor types is accom- base currents can he set and read individu- plished simply by interchanging two program ally. Since each base current is monitored plugs. on meter MI for a half -cycle, the actual Circuit Description. The simplified cir- meter reading is doubled for a correct base -

cuit diagram in Fig. 1 shows the unit in the current reading. pnp test position. With the power switch on, Construction. The transistor tester is a negative voltage at the cathode of diodes housed in a two-piece aluminum case meas- D1, D5, D6, and 1)8 will produce a negative uring 3th x 6 x 8 in. The front of the tester voltage at the collector and base of the tran- can be arranged to suit the builder, but the sistor under test. The emitter -to -collector author's layout worked well and can easily voltage follows a sine -wave variation (one he followed from the photos. The 33 -termi- half -cycle of 60 Hz); at the same time. the nal female socket (J7) provides most of the base voltage is limited early in the cycle to a tie points required for component mounting fixed value determined by the forward volt- (see Fig. 3). age drop of diodes D5, D6, and D8. Base -bias potentiometer R7 is connected

FEBRUARY -MARCH, 1968 75 1a r1) . Uyamiuo aº ,yNPN P:0'RAM,PIIV in series with switch S3, and S3 is located directly over R7. Similarly, base -bias po- Fig. 2. The two 33 -contact program plugs tentiometer R8 is connected in series with are wired as shown below. Plug PL1 is switch S2, and S2 is located directly over R8. for PNP; plug PL2, for NPN transistors. Both R7 and R8 are wired so that a clock- wise rotation lowers the resistance. The two 7,(-110 3 16 192225 program plugs (PLI and PL2) are wired ,;\ 26 29 using spaghetti -covered #20 or 22 buss 2"---45--18II 11117 2123 32 wire as shown in Fig. 2. 3 69 12 1118 22124 27 30 33 Scope Calibration. To set up your scope for use with our Dynamic Duo, the vertical PLI gain should he calibrated by applying a

1 -volt peak -to -peak AC signal to the scope's vertical input, then adjusting the vertical gain

for a I -in. -high pattern. The vertical gain is now set so a transistor base current of 10

milliamperes result in a I -inch will deflec- PL2 tion. It the same procedure is followed, but the AC input reduced to 0.1 -volt peak -to - and insert the appropriate program plug to peak and the vertical gain readjusted for a match the types of transistors to be checked. 1 -in. -high pattern, the scope is now cali- With three clip leads or a test socket, con- brated so one milliampere of transistor base nect the transistor to the tester, press both current causes a I -inch deflection. pushbutton switches (S2 and S3) simul- The horizontal gain is adjusted by apply- taneously, and observe the scope's trace. The ing a 3 -volt peak -to -peak AC signal to the horizontal component represents the AC scope's horizontal input and adjusting the voltage between the collector and emitter of

horizontal amplifier gain for a 1 -in. -long the transistor, and the vertical component trace. The scope is now set for a sensitivity represents the transistor's leakage current of 3 volts per inch. (le.). Using Dynamic Duo. Connect the tester To adjust the tester for a dual trace, press to a scope calibrated as described, turn the the pushbutton switch located above the bias base -bias potentiometers counterclockwise, potentiometer labeled 1132 (R7 on schematic in Fig. 3). With this switch pressed, adjust the base -bias potentiometer labeled 1131 (R8)

VERTICAL for the desired base current (multiply MI's J2SCOPE J6 c reading by 2 for actual current value) or until the desired trace is obtained. This sets up one curve. Next, press the pushbutton switch located above the bias po- 1131. J3 tentiometer labeled With this SCOPE switch pressed, adjust the base -bias - HORIZONTAL potentiometer labeled IB2 for the desired base current (multiply R5 117VAC Ml's reading by 2 for actual cur- .- rent value) or until the desired trace is obtained. sets R6 This up the 010 03 second Ic/V,., trace. With both pushbutton switches simultaneous- ly. A typical pup dual characteris- Fig. 1. Simplified schematic of tic curve is shown in the photo. 07 Dynamic Duo hooked up to The beta, or AC, gain and linear test a PNP transistor. (Continued on page /32)

76 RADIO -TV EXPERIMENTER I4 din.XWOu6u0YW0160.1pu44 II 14.11.14 ri,niii.1ni 44.140 ,431411111W4M4 11115111411/111404.41 OiOUMwu.t.i0.u0evW1w0040v.i6i:.w441* W i.r444566uw@,11,410016011614171111WY419411111N1141111tla vYvv R2 100a --,DS - - 19 22 75 e28 311

D9 010 20 . 23 26 .29 32

21 4 27 30 33

TO1- TRANSISTOR UNDER 1 TEST

S3 S2

R5 R6

12.6VAC C.T. 5.6K 5.6K --9 0Q./- T1

R7 R8 i 100K 100K it117VAC

Fig. 3. Schematic diagram of Dynamic Duo transistor characteristic curve tracer.

DYNAMIC -DUO PARTS LIST

D1, 02, 03, D4, D5, D6, D7, DO, D9, 010- R5, R6 -5600 -ohm, 1/2 -watt resistor 500-mA, 200-PIV silicon diode (Radio Shack R7, R8 -100,000 -ohm, linear -taper potenti- 276-1126 or equiv.) ometer 11, 12-#47 lamp and socket assembly (Radio S1-S.p.s.t. toggle switch Shack 272-1535 or equiv.) 52, 53-Pushbutton switch, normally closed con- J1, J2, J3, J4, J5, J6 -5 -way binding posts tacts (Lafayette 34C3402 equiv.) (Radio Shack 274-736 or equiv.) or J7-Jones 33 -contact socket for chassis mount T1-Transformer: 117 -VAC pri.; 12 -VAC, 1.2-A M1 -100 -microampere, 21/2 -in. sq. meter center -tapped sec. (Radii Shack 273-1505 or PL1, P12-Jones 33 -contact plug ecuiv.) R1, R2, R4 -100 -ohm, 1/2 -watt resistor 1-31/2 x 6 x 8 -in. aluminum chassis box 83 -22 -ohm, 1/7 -watt resistor Mist -Line cord, wire, solder, screws, etc.

J1 J2 R4 N1

?. Internal layout of parts in Dynamic Duo isn't A+r ="- _. ,.'...... 1 critical and con be modified to suit. i`rfi `r ~i n Terminals on socket J7 i t provide majority of required tiepoints. ji

J4 J5 J6 12 SI R1 S3 R8 52 1 J7

WWI ww..,,ww81, 1.11..._011111,,.+w1,1111,.11./1..,,,..1 mw.M,J

FEBRUARY-MARCH, 1968 77 mood Monitoring

Ei.eCtfollkally .

d 7.0 . By K. C. Kirkbride

Electronics will soon be able to tell It's All In The Mind. As we all know, the whether you are a happy and gay soul or a human brain consists of billions of cells mean old grouch. Because, as a result of a wherein each action or reaction sets up bursts revolutionary three-year research program, of waves in response to definite stimuli. a group of Honeywell Corp. space scientists Honeywell men, looking for a working prem- have related brain waves to states of mind. ise, projected a series of electrical stimuli In their' experiments, they have monitored into the brain and watched the reaction. volunteer subjects who were asleep, awake, Could monitoring these induced brain -wave alert or drowsy. Extension of this research changes measure fluctuations of alertness? promises to allow almost any mood to be That was the multi -million dollar question. monitored. To find out, they chose twenty-three sub- It all started when Honeywell scientists at jects and placed them in a closet -type steel the Military Products Division in Minne- chatnber, four feet wide, eight long and eight apolis faced the fact that as our space projects high; the chamber being used to screen out became more complicated, the success of a electrical interferences, movements, sounds, mission could hinge on the frame of mind of or smells that might distract or set up con- our astronauts. And unfortunately, to date, flicting brain waves in the subjects. Silver- we've had only inadequate means of deter- disc electrodes were then attached to the mining human awareness. Neither verbal nor scalps of each volunteer. visual reports are dependable. A pattern of clicks were beamed at the As any knowledgeable employer will tell subjects through a speaker mounted in each you, a man can be asleep with his eyes wide chamber. Reactions were then recorded over open and alert with his eyes closed. So 48 -hour periods as the subjects slept, ate, Honeywell men decided that if we don't find were alert or drowsy. During this time, their accurate checks on alertness of future astro- reactions were monitored by both electrodes nauts as they venture out in space, we may and a closed-circuit television camera. find ourselves minus some astronauts as well Clicking Brain Potential. Brain poten- as some pretty nifty Tiffany -priced outer - tials picked up by the electrodes were ampli- space hardware. (Continued on page /30)

78 RADIO -TV EXPERIMENTER By Ed Morris, KRP1830

Rates rocks for activity

Checks crystals for stability Spots channels with rapidity CB Rock Rater x

What can our CB Rock Rater do for you? activity is low, will not permit the oscillator Plenty! For one thing, it'll measure the rela- to generate as much output as another higher tive activity of your CB crystals. What does activity crystal. this mean to you? It means that you can The output from the oscillator is applied quickly determine if a crystal isn't up to to the center arm of selector switch S2 (see par. And this is important because with a schematic). When tte switch is placed in low activity crystal in your rig's transmitter, the lower position, the RF is rectified by the it just can't put out for you like it should, action of diode D1. It is then filtered by and the net result is decreased operating capacitors C4, C5 and calibration potenti- range! ometer R3. The resulting DC, which is pro- This nifty little package can also check portional to the original RF, is then read on your crystals for other defects, such as jump- meter MI. ing frequency, which, in extreme cases can When the switch is in the upper position, put you far enough off frequency to throw the RF oscillator output is applied to the you right out of the CB band! antenna jack through capacitor C6. This is Now about your receiver alignment. Are the position used when the Rock Rater is all the channels receiving dead on frequency used as a channel spotter or an alignment where they should be? If not, our Rock generator. Rater and a few CB transmit crystals lets Mechanically Speaking. Although the you align the receiver yourself-and save the exact layout of the Rock Rater is not critical, service fee. best results will he obtained, especially for Our multi -purpose CH test instrument is the beginner, if the layout presented is fol- compact, measuring only 4 x 21/2 x I5/s in., lowed. The more advanced builder should and it won't clutter your operating area. feel free to modify details to suit his needs. Being inexpensive to build, it won't put a In any case, good high -frequency construc- crimp in a tight budget either. And last but tion practices should be followed. no means least, simple circuitry makes it a Start work on the case by drilling the snap to build, even for the beginner. proper size holes as shown in the drawings. How Rock Rater Works. The heart of the The use of a T-square will aid in obtaining operation of this device is a crystal controlled accurate placement of the various holes. Colpitts oscillator. This oscillator, formed by The cut-out for meter M l can easily be

transistor Q I and its associated components, made with the use of a chassis punch of the generates an RF signal output when an ex- proper size. If one is not available, a hand ternal CB crystal is inserted into the crystal nibbler will do the job. socket. The frequency of the output signal is The mounting clip for the battery is made determined by the crystal frequency. from the center spring clip from a size "AA" The amount of RF generated is, to a large cell holder. This clip is easily removed from extent, determined by the activity of the the battery holder by drilling out the retain-

crystal under test. A weak crystal, one whose ing eyelets with a . 125 -in. drill.

FEBRUARY -MARCH, 1968 7n OIA.HOLE (7 REO.) CB Rock Rater x 3 f IN. DIA.HOIE (2 REQ.)

1 IN.. Finishing The Case. A strikingly profes- 2i IN. sional appearance can be achieved, even by the beginner, by simply spray painting and

lettering the case. The little additional time #IN and effort involved will prove to be well 1#IN.DIA.HOLE worth the results. To prepare the case for

painting, first remove all traces of dirt and +-,IN. FROM CENTER 41N. oil from it. Any remaining dirt or oil will ¡ N. (TYPICAL) OIA.HOLE (2 REO.) prevent the paint from adhering properly. IN.DIA.HOLE hIN. The easiest way to clean it is to wash the IN. case well with soap and water. After the To insure easy construction, lay case has dried, be sure to protect it from out chassis box holes as dimensioned above. your own fingerprints. Then remove burrs and apply several coats When painting the case, remember to use of spray paint for o professional appearance. very thin, light coats. The key to a good fin- ish is to use a light touch. Allow each coat directions exactly. A final coat or two of a of paint to dry thoroughly before applying clear plastic acrylic spray may then be the next. For a really first-rate job, apply a applied to protect the lettering. primer coat to the bare metal first. Electrical Construction. Most of the elec- After the paint has dried hard, preferably trical components are mounted on a 13/4 x overnight, it's time to apply the lettering. 13/4 -in. piece of perforated board. This board Whichever you use, whether dri-transfers or is mounted on the meter terminals as shown. decals, be sure to follow the manufacturer's Begin the electrical construction by wiring

01 2N3827 a S2 C2

22PF L2 C3 01 tra R1 1N270 C4 TEST 22K R2 CRYSTAL 330n .01NFT

B1

4. 9V9V, DC e c b BASE *--1111---1_ 2N3827

Schematic diagram of Rock Rater shows Colpitts oscillator whose output is fed to either meter M1 for rock -rating or to antenna jack J1 for channel spotting.

ROCK RATER PARTS LIST 61 -9 -volt transistor battery (Burgess 2U6) 99C5052 or equiv.) C1-0.05-uF, 12-VDC capacitor Q1 -2N3827 silicon transistor C2-22-pF, 1000-VDC capacitor R1 -22,000 -ohm, 1/2 -watt resistor C3, C6-68-pF, 1000-VDC capacitor R2 -330 -ohm, 1/2 -watt resistor C4, C5-.01-uF, 200-VDC capacitor R3 -1000 -ohm, miniature potentiometer (La- D1 -1N270 diode fayette 99C6142 or equiv.) J1-RCA phono jack, single whole mounting Si, 52-Miniature d.p.d.t. switch (Lafayette (Lafayette 99C6234 or equiv.) 99C6126 or equiv.) L1-#28 enameled wire, 7 -turns close -wound 1-Crystal socket (Lafayette 42C0901 or equiv.) on 1/4 -in. ferrite -tuned coil form 1-4x21/2xl s/s-in. aluminum chassis box L2-#28 enameled wire, 3 -turns close -wound Misc.-Wire, solder, nuts, screws, plastic tubing, over ground end of L1 perforated board, flea clips, lettering, spray M1-1-mA miniature panel meter (Lafayette paint, etc.

80 RADIO -TV EXPERIMENTER the hoard according to the schematic dia- gram. The general parts layout can he easily R1trtt determined from the photos. Although tran- sistor Q1 is a silicon transistor and is not o outr easily damaged by heat, care should still he taken while soldering ít into the circuit. This same care should be applied to diode D1, which is also easily damaged by excessive heat and mechanical actions that might

C2 L1,L2 / C3 01 1 C5

R1 R3

R2 Completed Rock Rater has a professional ` ti 01 appearance that lets it keep company á,: - c.4o with the snazziest of CB rigs. Here, it's f' C4 befriending an all -channel Lafayette HB-525 GND, CB rig. Don't they make a lovely couple? { TO 2

-9 TO TO Temporarily set the perforated board aside VDC Si CRYSTAL C1 and install meter MI. switches SI, S2, the are Majority of Rock Rater components battery clip, and the crystal socket, Wire as mounted on perf-board and wired following you go along. Then mount the perforated the schematic. Completed board board on the back of the meter terminals. is then wired to chassis -mounted assembly wir- components and installed in chassis. Finish up the last of the interconnecting ing between the board and the remainder of break its glass case. the components. Note that for proper operation, coil L2 Testing and Calibration. Place selector should be wound over the "cold" end of switch S2 in the meter position. Adjust cali- coil LI. In this case we mean the end con- bration potentiometer R3 to its minimum nected to the junction of capacitor C3 and resistance position. Place a known good coil L 1. channel 9 transmit crystal, or other known Particular care should be taken when wir- good transmit crystal whose frequency is ing to observe polarity of components as near the center of the band, in the crystal indicated on the schematic. This is espe- socket. cially true for transistor Q I and battery B I . Turn Rock Rater on and tune coil LI for After the circuitry on the perforated board a peak reading on the meter. Readjust the has been wired, carefully check it over for calibration potentiometer R3 as necessary to errors against the schematic. keep the meter from reading off scale as coil LI is being peaked. OSC.ASSEMBLY Once the coil has been peaked, adjust the S2 S1 calibration potentiometer for a 3/4 -scale read- ing (0.75 mA) on the meter. If you are not able to peak the coil, or to obtain an up- +. scale meter reading, carefully recheck your ..r- :, i.rr work for possible errors. 1 f the meter reads down -scale, reverse the meter's terminal f' ' connect ions. When Rock Rater has been adjusted to B1 read about 3/4 -scale with a known good crys- CRYSTAL SOCKET tal, this becomes your "average" gooU read- Completed perf-board assembly is mounted ing. Any crystal that fails to produce at in chassis by attaching it to the meter least a 1/2 -scale (0.5 mA) reading is suspect. terminal screws. After wiring has been Likewise, a crystal that exhibits an erratic checked for errors and the battery meter reading should be con- installed, Rock Rater is ready for a or unstable trial run and calibration. sidered defective.

FEBRUARY -MARCH, 1968 81 What to do when the junk box . is packed with high -wattage resistors.. Build the .. .

By J. R. Squires

Rare is the man who can lay claim to leads, or a screwdriver handle or table top. enough power resistors for his workbench The Load Box presented here is the or shop. For given sufficient power -handling author's answer to power resistor problems. capacity, such resistors come in handy for And though expensive to build if all new any number of uses-from dummy loads to parts are used, variations on this design to power -supply bleeders to plain old voltage suit individual requirements can he built dividers. using surplus or junk -box parts. The actual Typically, the experimenter dips into the number of resistors and jacks used should junk box for power resistors, and jumpers he determined by individual requirements, them together as needed. But all too often, since the unit presented here is what the the values aren't ideal and the resistors, run- author determined he wanted to fill his needs. ning hot, end up charring the bench, test The prototype provides resistances from a

l:nunp...tro,w.,:...w,:::.:I.1..111111-ITIVIVI ,.:,,,. II ,11:1,1,,.. :M11...... ,..,.. I...om.111:.,.11,:.1.:,1,111.11,11:.,

R8

25n J38 J39 Jp R9 4 R7 25 J40 22n J24 J26 S4 J41 J37 S3 J27 R10 J23 J5 J36 R6 22n D J42 J35 0- 5n R11 500 J43 R5 J34 12 J R4 5n 50n J3 . O44 0J25 R13 R14 22n 1 S5 9 ü 1K J45 V J33 10 12 1K t J28 S2 p 19 J32 u 'war"' 9 J46 R31n 6 15 J31 1K 1 J47 R16 R21n 9 1K J30 S1 R1 R17 4 J48 J2 In 1K J20 A J1 I J19

This is the schematic of the author's version of the load box; the string of power resistors, potentiometers, and series switches providing the ultimate in flexibility. At right, is the hookup employed in the knife -switch and monitoring meter circuits.

82 RADIO -TV EXPERIMENTER fraction of an ohm to more than 3700 ohms, extremely versatile tool wherever power with a power rating throughout in excess of handling is needed. 25 watts. Other features include built-in Load Box Put -Together. The prototype current -monitoring meter, fuses, and suf- has a three -pole double -throw knife switch ficient banana plug tie -points in the string mounted on the front panel. It was chosen of power resistors to provide a variety of because of its simplicity, current carrying ca- series, series/parallel, and parallel connec- pacity, reliability, and low contact resistance. tions. Of course, a double -pole switch could be As the schematic indicates, the number of substituted if deemed adequate or the switch interconnection possibilities is almost endless. and associated circuit could be deleted alto- What's more, the addition of four potentiom- gether. eters in the series string makes the unit an Nine binding posts are positioned on the

mam.m,,,,,.,,,,,m,,,,u,,,.mmm,,,,,. ,,.,.,,,,,,mm,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,.,,,,,,,,.,,,.,,,,.,,,,,,,,,.,..,,,,,,,,,,,,

J51 RED CENTER PARTS LIST J13 LEFT REO FUSE 11 -1 -amp fuse and holder 112 Q--45-1.,- ---0J14 F2; F3 -10 -amp fuse and holder 1 RED RIGHT RED LEFT F3 J50 )1-J22-Binding post (Radio Shack 274-736 J11 or equiv.) J9 Q--- o 'YELLOW RIGHT, .123-J51-Banana lack YELLOW LEFT bJ10 r 81 OiJ CENTER .N1 -1-A meter J6 41-1 -ohm, 25 -watt potentiometer RIGHT GREEN LEFT t J7 ~--GREEN R2, R3 -1 -ohm, 25 -watt resistor 25 potentiometer LEFT GREEN FUSE GREEN CENTER R4, R7, R10 -25 -ohm, -watt R5, R6 -5 -ohm, 25 -watt resistor R8, R9 -25 -ohm, 25 -watt resistor ¿J49 R11, R12 -50 -ohm, 25 -watt resistor R14, R15, R16, R17 -1000 -ohm, 25 -watt 101 R13, resistor J21 J22 S1 -21/4 -in. sq., 1 deck, 15° shorting between position, 24 -pole, 10 -amp rotary switch (Do- ver) 121 -DM -24A or equiv.) 52, 53, 54, 55-5.p.s.t. 10-amp toggle switch (Radio Shack 275-1533 or equiv.) SHUNT knife IN. 56-Triple-pole, douate throw, 10 -amp 7- - J18 switch í HITE #21 WIRE 1-8 e 8 e 10 -in. steel or aluminum cabinet Misc.-Wire, solder, knobs, hardware, etc. J170-1

F'PR""ARY-MARCH, 1968 113 front panel in direct relation to the screw

terminals on the knife switch. These binding --t( LI: to% posts are wired directly to their respective , i knife -switch screw terminals with the excep- tion of two, as shown in the schematic. These REAR PANEL two binding posts have a fuse holder in series with their knife -switch terminals. This r`L1 arrangement makes it possible to fuse the line being switched. . The main frame chassis is grounded at A the top mounting screw holding the knife switch. All other taps and terminals are iso- "Ilk"'A! ... R1 lated from ground. The three vertical termi- .bÑ 6 nals at the far left of the front panel are both ends of the 21 -tap series of resistors .wj.<47 and the center tap. The four toggle switches, S2 through SS, are also connected to the banana jacks on the rear panel as shown. This F3 convenience enables the addition of any four Internal layout requires- planning and external resistors which can be inserted into careful construction to obtain good results. the circuit to modify total resistance. These plug-in resistors have the added feature that Neither of the two voltmeter ranges de- they can he quickly shorted out by their as- scribed here are spectacular but they will sociated switch when no longer needed in serve in many applications. In addition, the the circuit. 0 to 1000 meter can be shunted between the The tap switch SI was mounted away marked terminals J16 and J18 on the front from the front panel with four polystyrene panel to increase its range to 0 to 10 Amps. rods in the author's model. The photographs The shunt is made from a piece of #21 illustrate the positioning and wiring of the enameled copper wire 346 -in. long strung be- components, though this will vary depending tween two single banana plugs. With the on the type of switch used. The rear panel is shunt plugged in, the ammeter scale reads laid out as shown or can be modified or 0 to 10 Amps 12 Amps. deleted as required. Bear in mind that the Again, many variations in construction power resistors can be expected to get hot are possible. For example, if the builder so don't dress wiring along, or in contact doesn't require a built-in meter, provisions with, the resistor bodies. - for an external VOM could be installed or Handy Meter. A 0 to 1000 milliamp the entire circuit eliminated. meter is used in the Load Box to conveniently monitor cur- RESISTOR STRING POTENTIOMETER CENTERTAPS Rl rent. Since the meter has an J2 - J5 R10 M1 internal resistance of 0.1 ohm, using a 100 -ohm multiplier re- sistor (the resistance between

taps 14 and 16), a 100 -ohm- RI per -volt meter with 100 -volt METER -itt1 o+n ~NW,::; CIRCUIT full-scale reading can he con- - TERMINALS structed. Using a 1000 -ohm J15 - J18 - r" (the be- multiplier resistance aí - tween taps 18 and 19) provides 114 a 1000 -ohm -per -volt meter

having 1000 -volt full-scale in- J1 fis y., a,,.:. in . ó F3 dication. RESISTOR --,,;!- , STRING END !` tic a ..) 9t' a '^ I All controls and major resistor

string connections are RESISTOR r` - 1 a!! accessible on front panel STRING TAPá ' of author's version. `,1:_l_'"'=.,____,, r Rear panel holds J20 jacks J21 RESISTOR S2 - S5 J6 - J14 through J51. STRING END S6 TERMINALS

84 RADIO -TV EXPERIMENTER

S9er

for

By W. Krag Brotby, Technical Editor S . Ls Low in cost, budget shortwave sets are also low in the one thing SWLs need most-gain. This six -buck soupup solves that problem.

no doubt that the inexpensive four- and five -tube superhet all -band re- There's inher- ceivers have made SWLing one of the country's most popular hobbies. Still, the big frus- limits of one IF stage and no RF amplification can also prove one great ent while tration. To solve this dilemma, some SWLs have gone the 0 -multiplier route, others have added a crystal or mechanical litter. Still others have put together a pre - selector or two, and the very well-heeled have turned to rigs in the $500 category. Addition of a Q -multiplier or a titter will improve selectivity but only at the expense image of sorely needed gain. A preselector will provide more sensitivity and reduce care of matters, response but it won't improve selectivity much. A $500 rig would take but it would also claim more clams than most SWLs have around. in But there is a way out. And if you feel six bucks is a worthwhile investment for your bringing home some rare ones (QSLs, that is), here's an answer just looking problem. words, more What we need is both more sensitivity and better selectivity-in other in most zonk. Unfortunately, zonk is just the thing the single IF stage found plain Old there budget receivers simply can't provide. One tube can't provide enough gain, and enough tuned circuits (IF transformers) to deliver decent selectivity. aren't little Given the problems of a typical, inexpensive SWL rig, the answer comes in a module sold by Lafayette Radio. It's an aluminum box measuring only 1/2 x '/ x I transistor IF in. but cram -packed with exciting stuff. It consists of two complete stages of IF stages, plus a crystal filter. Add the filter (not to mention two additional

,ttF FEBRUARY -MARCH. 1968 S9er for SWLs

, '. - . . .. }'14 . °

Lafayette supplies its CFIF module complete with input transformer (above, left); unit requires only a 6-VDC power source and it's rarin' to go. Cover -off view at left reveals relative complexity of module's internal circuitry.

gain and three additional tuned circuits) to attached with epoxy or other cement. The your receiver's IF strip, and you'll get lots of separate input transformer can be attached DX -making zonk. On the author's hookup to the module or mounted separately. For to an EICO "Space Ranger." the little goody ease of assembly, the author attached the added 55 dB gain and knocked bandwidth input transformer to the module by carefully down to about 3.5 kHz-an appreciable bending the connecting pins improvement. of both the transformer and the module so they could be The module can he used with any radio soldered directly togethdr. But bear in mind with a 455 -kHz IF, whether for SWL or BCB that the input transformer has a slug that DXing. Its small size makes it can simple to he reached only from the top and that ntusl install and the power requirements of 6 VDC be accessible for final alignment. (In the au- at about 2 mA are easily fulfilled. thor's case, this was accomplished through Construction. The first is step to deter- a hole drilled in the chassis.) mine where to mount the IF module. It If the module cannot he conveniently lo- should preferably be as close as possible to cated near the receiver's final IF transformer, the receiver's last IF transformer in order to use shielded cable to connect the keep leads short. input trans- The module can he former. Otherwise the mounted receiver may actually in any position and either on top or go into oscillation. bottom of the chassis. Wiring The Module. The input trans- The author placed the unit on the bottom former is wired to the receiver's last IF trans- edge of the chassis skirt, as shown in the former. If you have a schematic of your rig photos, for easy access to the module's con- it's easy to find. In any case, it's the trans- necting pins. The module can he readily former closest to the audio section. This Cl INPUT XFMR IF MODULE r . JR I »ggIRR -0041

Author managed to tuck R2 module, input transformer, and capacitor C1 along rear Ig "t ¢ R3 apron of his EICO Its Space .i. DI Ranger; associated power supply (Dl, C2, R2, R3) along ;C2 one side. Module is ideally mounted as close as possible to s receiver's last IF transformer. /<91 ,:i - r a._.r_ 86 RADIO -TV EXPERIMENTER TO MODAL INPUT TRANSFORMER schematic of typical IF Partial TRANSFORMER DETECTOR/FIRST AUDIO 4/5 -tube superhet, showing IF STAGE x TO few changes required to add AUDIO module. Pictorial below OUTPUT bottom views of both STAGE presents input transformer and module and should be followed carefully. If optional RF gain control (R1) is not required, top left lug of transformer should be connected directly ~,BREAK CIRCUIT at point HERE to IF transformer TO MODULE OUTPUT (PIN 7) Ave VOLUME indicated in schematic. CONTROL See next pcge for power -supply schematics.

TO RECEIVER IF TRANSFORMER

PARTS LIST MODULE TO 46VDC 01-Silicon rectifier, 50 -Ply, 50-mA t C1-.05-uF capacitor R1 elec- 2 C2-500-uF, 12-VDC miniature 10K RECEIVER trolytic capacitor VOLUME R1 -10,000 -ohm potentiometer It j9s CONTROL R3 1 -waft resistor R2, -220 -ohm, T0 1-IF module (includes input trans- INPUT TRANSFORMER 99H62541 former) (Lafayette - .05 Misc.-Wire, solder, terminal strip OPTIONAL RF hardware, etc. GAIN CONTROL

heater supply transformer feeds the detector, which, in your receiver has a 6 -volt or with a volt- budget receivers is usually a 6- or I2AV6. (check on your schematic shown in power As shown in the hookup schematic, the meter), construct the supply A on a 4 -lug terminal strip is broken at .the output of the final supply schematic circuit The negative IF transformer. One side of the module's and mount where there's room. the positive side is input transformer is then wired o the sec- side is grounded and the module. ondary of the receiver's IF transformer; the hooked to pins 6 and 10 of uses 12 -volt tubes, con- other side is grounded. If your receiver (B) using an input The output of the module bypasses the re- struct the alternate supply of two 220 -ohm ceiver's detector and is wired directly to the voltage divider consisting volts being taken audio section, since the module already con- resistors in series, the 6 as shown. tains a detector. The most convenient place from between them, series-filament type radio re- is to tap into the hot side, of the receiver's The AC/DC a schematic. The volume control. quires a little more care and I 2AV6 at schematic of a typical budget series -filament string usually has a The partial this by receiver shows where to connect the module, the 'cold" end of the string-confirm (The cold end means this hookup being virtually identical in all checking the schematic is grounded and the receivers. You can also locate the point by one side of the filament in the series touching your finger to each of the three other goes to the next filament volume control taps in turn: the outside tap string.) rig, simply attach the with the loud hum is the one you want. If this is so on your of two 220 -ohm re- If the distance between the module and voltage divider consisting filament connec- the volume control isn't too great, just hook sistors across the 12AV6 volts from between them, as the module output (pin 7) to the hot side tions and take 6 power supply schematic of the volume control. If it's a long run, shown in the third other 12 -volt use shielded cable to prevent hum (C). If your set uses some better remain the pickup. Add the .05 bypass capacitor to tube in this position, connections with fila- the input transformer as shown, then connect same. Of course, if a tube another another ratio for and 9 of the module to ground. ment rating is used here, pins 8 used. Power Supply. The module requires 6 the divider resistors will have to be wiring and make VDC at about 2 mA for best operation. If Operation. Recheck all 87 FEBRUARY -MARCH. 1968 Final Alignment. While odds are that the S9 for SWLs receiver will work pretty well right off, it should be aligned to get maximum benefit from the modification. Alignment can be ac- complished with or without a signal gen- erator. 0 01 N+ MÓDULE With a generator, set the frequency to Í C21_1 (PIN 6 8 10)' about 455 kHz and keep the 6.3VAC RF output level 1 5001JF quite low. Hook the generator's output to the module input transformer and hook a A VOM (AC scale) to the speaker leads of the 6.3VAC FILAMENT SUPPLY receiver. Tune the signal generator around 455 kHz until maximum signal gets through the module. This is the crystal filter's fre-

TO MODULE quency, which isn't adjustable. Being careful (PIN 6 0.10) not to detune the generator, transfer its out- put lead to the input of the receiver's first IF transformer. Reducing the signal gen- erator's output level as needed, peak up all the IF transformers including the top slug B of the module input transformer for maxi- 12.6 VAC FILAMENT SUPPLY mum reading on the VOM. If a generator isn't available, simply tune in a 12AV6 OR OTHER weak station whose signal is steady and 12VOLT TUBE free from fading. Using the VU meter (if R2 your receiver has one) or a VOM (AC 220n T0 MODULE LAST scale) hooked to the speaker (PIN 6 & 10) leads of the FILAMENT receiver, peak all the IF transformers for 500" IN SERIES maximum meter indication. Repeat the peak- STRING C2 ing procedure several times to make sure you're getting everything you can. With the modification finished, a little fur- C SERIES FILAMENT SUPPLY ther use of the receiver will soon convince you that the addition of this - Required 6-VDC to power little crystal module can be filter -plus -IF will provided by 6-V battery or module give you more DX- one of three making zonk per supplies shown above (see Parts List on buck than anything else preceding page for component values.) going.

sure the polarity of the power supply diode w and filter capacitor are correct. If everything ,.. checks out, you are ready for a trial run. ,á Turning on the receiver, probably the first thing you'll notice is a hissing sound-that's from the convertor. You get so much gain is/. , that internal noise of the mixer tube will t come through if no signal is present. . i Tuning in a few stations will quickly show :°::,_ 7 , I the tremendous increase in gain and the :. . + added selectivity. If you find that strong sta- +e. tions have a tendency to overload the IF strip and cause blocking or distortion, add the op- tional RF gain control shown in the pic- torial. Again, either keep the leads quite short or use shielded cable for interconnec- POWER SUPPLY Another view of tion. Mount the control in author's receiver, show- any convenient ing placement location, preferably on the of module and power supply. front panel where Since no two receivers it's easy to reach. are alike, location of module will depend on chassis layout. 88 RADIO -TV EXPERIMENTER ; ...

. ';.í,11W .n.154 ,>,vh ó .. ;, : í. ,.I AM

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PICON, PICON, WHEREFORE ART THOU, PICO N?

How long has it been since you helped a to be on the lips of thousands of active hams little old lady across a busy street? across the nation, stands for Public Interest, The Boy Scouts used to he noted for this Convenience Or Necessity. Those are the kind of sincere, unselfish helpfulness (re- key words that describe the intended opera- member when one of Scouting's watchwords tion of the Amateur Radio Service. (I em- was "Do a good turn every day?"). This phasize the word service. because that's the used to be a key function of ham radio, too, correct name and it's also what we're sup- but a lot of hams have forgotten it. Some posed to provide, when needed.) may never have learned it in the first place. When we stop operating in the public in- Just the other day I had lunch with a terest, convenience, or necessity, we may young fellow who works in an engineering stop being hams-by government decree. lab of a leading electronics company. He's This doesn't mean every one of us must de- been an active ham for several years, but vote all our operating time every day to he never heard of this public-service function handling traffic, rescuing drowning victims, of ham radio! And he may be more typical or dispatching fire trucks. It does mean. than some of us realize. however, that enough of us must provide For example, ask a dozen hams for the public-service communications, when there is meaning of "PICON" and most of them a genuine need for such activity, to help jus- probably won't even recognize that you're tify use of our frequencies by all hams. talking about ham radio. PICON, which used Public-service communications probably

A police car with a Ham rig in it? Sure is! Officer John Annis, WA6PCY, of the California Highway Patrol, monitors 7255 kHz while performing his regular duties; this is the frequency used by the West Coast c Amateur Radio Service net. F, . '

- -',_ .,r;,iF;-=_ ' '- ' `..,-! S - r - - .x ._n ., - -- - -'--- - FEBRUARY -MARCH, 1968 89 HAM TRAFFIC Annis, he has another claim to fame-he has one of the Patrol's amateur SSB transceivers in his police cruiser! In fact, the next cop car will not do this all by itself. But it will help you see with a 40 -meter whip just might be demonstrate to others that we hams have a Officer John on patrol. sense of responsibility and are worth having Direct Coupling. The 21st and 19th cen- around. turies have now been direct coupled, elec- Service With A Smile. Fortunately, tronically speaking, by a new machine de- there still are some hams who take our re- signed to train radio operators for the U.S. sponsibilities seriously. For example, a gang Army. For though Uncle Sam's boys have on the west coast, appropriately called the the latest in single sideband and Teletype West Coast Amateur Radio Service, is doing gear to handle much of their traffic, at least its hit to perform some genuine public serv- some of them must he able to work Morse ice. A friendly note from Ed Gribi, WB6IZF, Code if necessary. Sometimes fancier gear offers the following rundown on this group's breaks down or can't get through noise or activities. interference. Then it's CW to the rescue. Members operate a net on 7255 kHz from Thing is, the crew-cut boys on the draw- 0800 to 1730 Pacitic local time daily to pro- ing boards have decided the stern-faced code vide "service to the public and other ama- instructor in the radio classroom is no longer teurs by assisting in emergencies, handling needed. Some lads at Sylvania have replaced traffic, and facilitating contacts," Ed explain- him with an automatic machine for teaching ed in his letter. Morse. There are two dozen training con- The net has been operating for four years soles in the setup, each wired to give indi- now. In its ranks are some 370 regular vidual instructions in how to handle the dots members scattered from the state of Wash- and dashes. ington down into Mexico, and from Utah to Needless to say, the whole ball of wax is maritime mobiles in the Pacific. There's a controlled by an electronic computer! formal net session and roll call at noon daily Novice News . . . The Friendly Chirp to train members how to operate with effi- Checkers, otherwise known as the FCC, have ciency, effectiveness, and discipline in the added nine new questions to the Novice class event of an emergency or disaster. Informal exam study material. net operation is maintained the rest of the At the risk of being called a nasty old man, day, with base and mobile stations monitor- I'm going to give just the questions here. If ing the frequency. you're studying for the Novice exam, you Ed says on a typical recent weekday, some should be able to determine in a jiffy whether 225 stations -135 of them net members- or not you know the answers. If you don't, used the frequency. Two priority and 14 back to the books, lad. routine messages were handled, 15 phone 1. When is one-way communication patches were arranged, and at least 100 in- permissible? formal 2. communications were completed, What is a Hertz? kiloHertz? mega- either on or off the net frequency. Hertz? Among members is the California High- 3. What are some correct ways to call way Patrol, whose headquarters amateur sta- and answer other amateurs stations via tion, W6CDY, is a charter member of the ? West Coast Amateur Radio Service. The 4. What are some common Q signals patrol has three SSB transceivers for coordi- and what purposes do they serve? What nating official Patrol work with amateur do QRA. QRM, QRN, QRS and QRT communicators in emergencies. What's more, mean when transmitted as questions via at least three members of the Patrol are telegraphy? hams involved in the net 5. What activities. They are important functions do diodes . Harold Samson, W6JBA, supervisor 'of the pert órm? Patrol's electronic data processing section, 6. What units are used to measure ca- and officers Jim Clark, WA6NSK, and John pacitance? Annis, WA6PCY. 7. How are transistors made, used, and Samson recently received an outstanding diagrammed? What are some common performance award from the Patrol for help- transistor parameters? ing set up a MARS ( Military Affiliated Ra- 8. Why is impedance matching neces- dio Service) operation for the Patrol. As for sary? (Continued on page 134) 90 R Artv(1-T V F.Xi`RRTMF,`JTRn By Herb Freidman, W2Z1F

Make like a pro and troubleshoot the simple way with our easy to build self-contained solid-state signal injector.

Almost anyone, with a little training, can become a trouble- shooting expert if he's given a yard or two of test gear. But for those not fortunate to be blessed with several hundred (or thousand) dollars worth of test equipment, troubleshoot- ing becomes a matter of brainwork. Thing is, even the brain can't function if it has no information to go by. But feed

MINI-the best "computer" of all just a wee hit of information, such as which circuits are go and which are no-go, and the brain can almost instantly point the J ECTO R way to the defec- tive circuit. How to. tell which circuit in a dead receiver, recorder, or amplifier is go or no-go? Simplest way is with our multi- purpose signal injector. A signal injector is a rath- er simple device-a square - wave - producing multi - vi- ^ with a fundamental *Zit brator 7 . output frequency some- J.. where in the audio range. Because the waveform is complex, either square or sawtooth, harmonics are produced well into the short- wave regions-as high as 30 MHz. Place the output of the signal injector on the grid (or base) of an audio tube (or transistor), and you'll hear a somewhat distorted tone. Move the signal injector hack to the 1F ampli- fier and you'll still hear a tone because the injector is also producing output in the IF range. Move the injector further back to the RF input and again you'll hear the tone because the injector also has output in the RF spectrum. Fault Finder. Ii somewhere along the line you fail to push the tone through the set. you have isolated the defective stage. As a result, you now have something to feed into the human computer to solve the problem. Our ultra -handy Mini-jector shown in the photo is complete within a standard test probe: the multi -vibrator, battery, and power switch are all self-contained. Flip the power switch on, and you'll get a signal output in the audio band up to approxi-

FEBRUARY-MARCH, 1968 91 MINI-JECTOR HOLDER FOR B1 01 Cl 02 mately 12 mHz. Unlike some commercial signal injectors, this one doesn't produce a 1 r - ,f- growl that can be confused with radio noise or interference; the multi -purpose signal in- - jector's output is a crisp tone with a funda- M_ R1 R4 C3 mental frequency between 1 and 2 kHz. j Making Mini-jector. The injector is as- .."'' _. . . '.-. sembled in a Keystone type 1810 test probe ' ro,. u v! .. . i 4°. Cr v-wtl Pi : ., .=x::; kit. The kit comes complete with an outer .r1,' '` í! rir.r....F'.;-.r.,ar,rt-ti.-,u. plastic handle with a '%2 -in. hole drilled at Components are mounted on perf-board as shown. Completed assembly thenslides into ca sing,,,1,11,1111,11,,.1,,,110/1111110.,"I.II,,,,IIMIIII.IMMI..Ii

one end. The other end is open to receive the screw -mounted cap and test prod. Also supplied is a section of perf-board, a bag of push -in terminals and a brass shield. The shield is not used for this project. (If your local Keystone dealer doesn't stock the 1810 The test probe kit contains all mechanical test probe kit, see the Parts List for a source parts required for Mini-jector including of supply.) probe, brass shield, matching perf-board The entire signal injector is assembled on section and bag of push -in terminals. the perf-board. Note that one end of the

01. 02 perf-board has a staked terminal; this is the 25404 forward (test prod) end, and the terminal is c 1.5 used for the output connection to the test VOC prod. Cut 1/4 in. off the back of the perf- B1 board and mount a Keystone type 137

.01 miniature cell holder (for AAA battery) in OUTPUT such a manner that the frame of the holder 51 is exactly flush with the back of the perf- .01 ALLIGATOR board. 02 CLIP Push 25404 -in Tiepoints. Except for the com- GROUND mon battery negative -connection and the Circuit diagram of Mini-jector. ground cable which use push -in terminals for tie points, all components are connected by simply passing their leads through holes PARTS LIST in the perf-hoard, twisting, and soldering. B1 -1.5 -volt size AAA battery (Eveready 912 Take care not to use excess heat when solder- or equiv.) ing the transistor leads. Cl, C2, C3-0.01-uF, 6-VDC capacitor Transistors Q1 and Q2 are the 2N404 01, Q2 -2N404 transistor (see text) type, but the low-cost Lafayette Radio type RI, R3 -100,000 -ohm, 1/10 -watt resistor R2 -10,000 -ohm, 1/10 -watt resistor 19-4215 will work just as well. Space is at R4 -3300 -ohm, 1/10 -watt resistor a premium so use 'fin- or 1/4 -watt resistors 51-Miniature switch (see text) and miniature 75- or 100-VDC capacitors. 1-Alligator ground clip Position Q2 as close as possible to the staked 1-Cell holder (or AAA battery (Keystone 137 or equiv.) terminal and Ql as close as possible to the 1-Test probe kit (Keystone 1810 or equiv.) battery (cell) holder. Misc-Wire, Solder, etc. When the perf-board assembly is com- The Keystone test probe kit is available for S1.98 (postage and handling included) from Tridac Elec- pleted, install power switch SI. This can be tronics Corp., Box 313, Alden Manor Branch, Elmont, either a low-cost pushbutton switch, in N.Y. 11003. New York State residents add appro- priate sales tax. which case you will have to hold the button (Continued on page 129)

92 RADIO -TV EXPERIMENTER -111_iAsi111EIIVG

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OUTPUT TRANSISTOR STOP -A -SHORT When building your own transistorized power amplifiers, like this one using a cake pan for heat sink and chassis, take a tip from manufac- turers and mount a barrier terminal strip for the speaker connections. This will help prevent shorts which can damage or destroy the output transistors. The response time of transistors is faster than that of fuses, and this is one good way to take care of the problem. -J.M. McKeenan

NO -COST VOLUME GETTER At parties, dances, or other get-togethers, more volume can be had from that little tran- r`"¡¡i sistor radio without resorting to complicated I solutions. Simply attach a cheer -leader type , ' megaphone to the radio with rubber bands or l°. 1;1 tape as shown, with the megaphone's mouth- piece centered over the radio's speaker. The end result is double or triple the volume. -Art Trauffer

SPEAKER PHASE REVERSER Here's a quick and easy way to flip the con- nections to the speakers in a stereo set-up. The photo shows two types of connectors that can be used in the speaker wiring; one is a standard

{ AC plug and socket, the other is an automotive type. Both types are un -polarized so that re- versing speaker phase can be accomplished by simply reversing one of the plugs.-J. Hancock

BASS -REFLEX REAR -SEAT AUTO SPEAKER When installing that rear -seat speaker in your car, mount the speaker on bushings as shown in the drawing. The bushings should be about 1/2 -in. long. This creates a port for the speaker's backwave, thereby reinforcing the bass. Another advantage is that the fragile speaker cpne is less subject to damage from excessive air pressure created when the trunk lid is slammed shut. -Albert E. Hart

O Send your Imagineering Design Tips with full details and a photo or drawing to Radio -TV Ex- perimenter, 505 Park Ave., New York, N. Y. 10022. The top ideas selectec by the editors will win $10.00 each. Entries become the property of Radio -TV Experimenter and can't be returned.

FEBRUARY -MARCH, 1968 93 1.. .r 1 1 ti 'IrjÁf Ir ; , u 7 1 l "#4' ,:truan ,+ r t } it. . , I 11 i 1 Í ;', iÍ h}f; , µ' , , t j ; !t* " . ilf iir I tt ii ii IN 'r: rr i- .ra t u ., ,: ¡ ' 0 II ¡ N. ¡ I 1:.IN111¡ J a l V n '; ti. I - allti r dd. y+ 1' t t r ytt-, I 11, wi 1.. ,, 1 N I { Il '"" , a. . .1 .}--- t .1r 1' ^' D i ¡ r" i' i { i t i r m,. T _ i 1i-1--1C`t , . « ü tI"ll'.. iiiíillllil q,ii { swi

matic, in fact, shows the wiper in the ofJ position. When installed, R I completely dis- connects the TV speaker, substituting RI and R2 as the load for the TV receiver's out- a. put transformer. Since R2 and its associated remote speaker are connected across R1, the TV sound output appears across R2, with the remote speaker level determined by the position of R2's wiper. The Duo -Remote Speaker requires a 3-' wire connection to the TV receiver's speaker circuit in order to obtain control over both the main and remote speaker level. Two controls on side of For con- Duo -Remote venience and extension speaker allow maximum flexibility-like al- adjustment of both lowing the the TV and remote speaker volume. TV receiver to be "pulled" for servicing-a plug and jack arrangement such as Do loud TV commercials take the pleasure shown in the schematic is suggested. out of your evening idiot -box viewing? Do Note that 11 is a special version of the standard you find extended lectures on sweaty armpits 3 -circuit phone jack, having a through cause nausea? How about that rock singer connection on the tip terminal. When with the booming voice who turns out to connected as shown, removing the plug have (thereby a flea's whisper on TV, requiring a disconnecting the remote speaker) walk to the box to crank up the sound, and automatically restores the original TV speak- er another walk to turn the sound level down circuit. A further refinement as shown in the when the M.C. comes back? Whatever the photos, is the use of a telephone type annoyance, it can he overcome with a remote TV speaker and remote volume controls placed next to your favorite armchair. Adding a remote speaker and remote volume control for both the main TV speaker and the remote unit is an easy installation since virtually everything is supplied pre - wired in Lafayette Radio's Duo -Remote TV Speaker. As shown in the schematic, the , Duo -Remote Speaker consists of all com- ponents inside the dotted line-and these are supplied pre -assembled in an attractive walnut -finished cabinet. Tr, . k. Control By The Twos. Note that two controls are provided: RI, which r L--1 ' controls ---- - the level of the - main TV speaker, and R2, .anirit r which determines the remote speaker's sound level. R l is a specially constructed potenti- First step is to remove ometer with a full off position-the one of the leads sche- going to the speaker in the set. 94 RADIO -TV EXPERIMENTER T.-,- r---- , I r ` r liutr . fj1 ',`1 `f!'"! t` ;! t !1'; -r' .p; , ,.ItL. .r en loud commerclal give you thel bob tube blüe,, e easy TVNsound control Iest thoi yeary 81r1, I remote, ; ir l+f+ + }hea-,140

; l 1 INa .:; 11,. _ , ''1 0 r. i i't ' . III -' i , lil'i' t `.i 'l Ir, r _' p.+ ,iN ,T' I IÍ'.i' :` Sr1 11 _l IO . I 11 ti . -- . -Ail 1str' F ° r ' '- II ,;I'I,,h . Ill7- a._.I,i ! {I' ' ' I I' : ' r- 1 - I_ , .. - .. 1111 l 1 I I, µ ' I I ¡`l bull.- jli' i II ti ,' TI 1 I I I1117I' 1 i . .

l disconnect one of them at the speaker termi- irnal. Now install J I on the back of the tele- .12 vision receiver. Generally, the back cover t- has a series of 3/8 -in. ventilation holes and J l can be installed directly in a handy one,

. I's with no drilling required. l w'r..4._, a .,a1 ` !d. ,uu holes, you will, ' ...s.l If there are no ventilation .1141 I t ,s,.'M c a . . . of course, have to drill a 3/a -in. hole for II in any convenient location. If the back is l metal, II should be insulated for safety by using a set of fiber shoulder washers between 11 and the metal cover. After J I is mounted, xb , m, wire it up as shown in the schematic. Try Remote speaker jack can be mounted in to use the shortest possible leads and route one of the ventilation holes in back of set, them away from IF and RF circuits. or %-in. hole can be drilled to suit. Now put the TV cover back and apply

jack and wall plug at the remote speaker location, allowing the remote speaker to be unhooked at its location during houseclean- ing, etc. Doin' It. The first step is to pull the TV power plug and remove the back of the cabi- net. Locate the two wires leading from the audio output transformer to the speaker and

Matching telephone plug connected to Duo- Remote allows unit to be readily disconnected for housecleaning.

power. After the set warms up you should hear the program sound if no plug is in JI. If you don't hear the TV, better check for P an error in wiring. If the sound is coming 1:71 through, insert an unwired 3 -wire phone plug in J I ; the sound should be cut out. If it doesn't. check again for a wiring error. Final Installation. If you want a quick - and -dirty finish, simply connect P1 to the existing Duo -Remote wiring as shown. In- sert P1 to J1 and the installation is com- plete. However, since the wire supplied with Telephone extension jack is mounted on base- the Duo -Remote unit is very thin and easily board near desired location of remote unit. broken, a more permanent installation can

FEBRUARY -MARCH, 1968 95 Decibel Decimator be made by using standard #18 or #20 u three -wire cable stapled to the moulding with an outlet plug at the speaker location. Determine where the remote unit goes, rl then staple the 3 -wire cable to the moulding with a round -staple stapler (the type used by electricians or telephone installers). If you have a tackless wall-to-wall carpet in- stallation, the wire can often be pressed into the space between the carpet and the mould- ing. Plug in PI at the TV end of the cable and install a telephone -type jack (four connec- tions) at the seating area. Connect the three wires of the cable to three of the four tele- phone jack terminals and connect the match - Decibel Decimator all hooked up and ready to go. With a little use, you'll find TV RECEIVER this inexpensive job's quite a step -saver. f (TIP) red ing plug to the cable from the Duo -Remote R2 Speaker. RING Usin' It. With P1 plugged into JI and j I Pt the SP RR telephone plug into the telephone jack, set the main speaker control on the Duo - L(SLEEVE)'b1k J Remote to I TIP SLEEVE maximum volume (full clock- RC 71.11.-- TV wise) and the remote speaker control to off Wire up the jack on the back of the set (counterclockwise). Turn on the TV re- according to the sche,matic. The extension ceiver and set the TV sound slightly louder speaker, in the dotted lines, is pre -wired. than normal-the volume can then be set to a comfortable level with the main speaker 1111111111.1411.1.1111111111111 11 11 11 11 control on the Duo -Remote. To kill the PARTS LIST main speaker from the Duo -Remote, simply rotate .11 -3 -conductor jack ISwitchcraft type 13B or the main speaker equiv.) control counterclockwise. The level at the remote P1 -3 -conductor phone plug (Switchcraft type speaker can be ad- 267 or equiv.) justed at any time-either with the main 1-RC-TV Duo -Remote Speaker (Lafayette 99- speaker on or of-to any desired volume H45961 with the remote speaker 1 control. Now when -4 -contact wall -mount telephone plug and socket (see text) your ears are assaulted by unwanted TV Misc.-Wire, solder, staples, etc. sounds, you can fight back with but a flick c1:,o111u 1,,,..,,.,m,11..,..1,...... w111..,,..1.n,. , y.. .1...., of the wrist.

Bigger Antenna Feeds There Aren't Designed and built by Radiation Inc., the world's larg- est antenna feed is big as a two-story house and weighs in at 14,000 lbs. The feed is constructed with four outer VHF error horns located around a VHF sum horn, and it even sports a UHF sum horn in the center of the VHF job. Because of its multiple horns, the feed can provide four different types of polarization-vertical, horizontal, left and right, and circular. Its purpose is to gather maxi- mum target information from a radar echo. Intended for use with a 150 -ft. detection and tracking antenna that is part of the nation's anti -missile defense program, the feed f . will be shipped to the South Pacific o for permanent installation. Q V e\/

96 RADIO -TV EXPERIMENTER ,A -

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- AriEATHERMÁN '

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BY LEO G. SANDS, KOD1939

Valuable, up to the minute weather in- Marine Public Correspondence Channels, formation is being broadcast by the within the 150-174 MHz mobile band. 'U. S. Weather Bureau, and, it's available to These are FM signals with ±15 kHz devia- anyone free of charge. The U. S. Weather tion as used by VHF/FM marine radiotele- Bureau has in operation 19 weather bureau phones, instead of ±5 kHz used by the land stations operating on 162.55 MHz. Approxi- mobile radio services. mately 150 more are scheduled to be added You can't tune in these broadcasts with in the near future to cover all coastal areas an FM broadcast receiver. In order to re- and cities of over 100,000 population. These ceive them, you must either have a fixed - FM radio stations hroadcast weather infor- tuned VHF/FM monitor receiver, or pocket mation for mariners, motorists, aviators, paging receiver that can be tuned to 162.55 boatmen, etc. MHz, or, you can use a converter with an The Weather Bureau's radar and radio AM BCB auto or home radio which then station (KWO-35) in is employs "slope detection" to demodulate the atop the RCA Building. Meteorologists FM signals. Here is a breakdown of the watch the radar and give cloud -by -cloud re- various means that can be used to receive ports. The station's broadcasts can be heard these Weather Bureau broadcasts. at least 60 miles away and one. yachtsman VHF/FM Monitor Receivers. There are said he could pick up the broadcasts when numerous VHF/FM receivers available on 140 miles out to sea. the market that can tune the 150-174 MHz Where? Weather broadcasts are trans- band. Some are available in kit form for mitted on a channel adjacent to the VHF less than $50 or you can. pay as much as

FEBRUARY -MARCH, 1968 97 Weather Broadcast Receivers

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Sonar Monitor Receiver

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-

Allied Knight KG -221A FM Monitor Receiver Lafayette HA -520 FM Communications Receiver

$200 for one completely assembled and tures, such as better sensitivity and higher ready to use. stability. All fixed frequency monitor receiv- Receivers are available which operate ers are crystal controlled and some have an from 117 VAC, 12 VDC, or either one. RF stage to provide increased sensitivity There are also portable receivers that oper- and a squelch circuit to cut out noise when ate from self-contained batteries and some not receiving signals. operate from AC as well as batteries. The There are also combination type monitor advantage of a tunable receiver is that it receivers. These receivers can use a crystal can not only monitor weather broadcasts, for a sp.ecitic channel, such as the Weather but police, tire, railroad, mobile telephone, Bureau broadcasts, and a tuning dial for tun- business and various other radio services as ing in other channels. A switch is provided well. to change from fixed frequency mode to tun- Fixed -tuned VHF/FM receivers are also able mode. Prices for these units start at available which operate from 117 VAC less than $100. or 12 VDC, or both. In some cases Portable Receivers. Until a short time only one channel is used. In others, a front - ago, a pocket size VHF/FM portable re- panel switch enables selection of from two ceiver was very expensive. There is one now to six channels. These receivers arc crystal on the market for only $39.95 which makes controlled and a separate crystal (162.55 it inexpensive and easy to receive weather ti1Hz for the weather bureau), is required broadcasts. for each channel you want to monitor. There are expensive types of pocket pag- Fixed -tuned receivers cost from approxi- ing receivers, similar to the type IBM serv- mately $75 to about $250. Realize that the ice technicans use to receive their orders. more expensive receiver has additional fea- These paging receivers contain a decoding

98 RADIO -TV EXPERIMENTER _-_ _. ,

Allied 2671 AM/FM Portable Communications Receiver

- - ,

~Lair wv.,e. r ._... -y ...-°

j( i° '1CyÍ

Radio Shack Realistic Patrolman MW/VHF Receiver Sonar FR -103 VHF Sentry A variety of receivers capable of picking up the 162.55 -MHz weather Unimetrics FM Minivox broadcasts are available within a price range to suit every budget. A sampling of these receivers is shown here.

device which prevents the receiver from op- U.S. WEATHER BUREAU STATIONS erating until a special coding signal activates Location Call letters Operational it. This decoding device is not included in receivers for listening to Weather Bureau Atlantic City KHB38 During 1968 Boston KHB35 By January, 1968 broadcasts or other communications chan- Charleston KHB29 By January, 1968 nels. Chicago KW039 Now These little paging receivers are charac- Corpus Christi KHB41 By January, 1968 teristically very sensitive and selective, have Galveston KHB40 By January, 1968 no external antenna protruding and have a Hartford KHB47 During 1968 Now built-in squelch circuit that keeps the re- Honolulu KHA99 Jacksonville KHB39 By January, 1968 ceiver quiet until a signal activates it. A crys- Kansas City KIB77 Now tal, of course, is used to control frequency Lake Charles KHB42 By January, 1968 and self-contained batteries are utilized for Los Angeles KW037 By January, 1968 power. Miami KHB34 Now Available Pocket Portable. One of the New Orleans KHB43 By January, 1968 KW035 Now newest pocket portable receivers that can be New York KHB37 During 1968 used for tuning in weather bureau broad- Norfolk San Francisco KHB49 Now casts is the Sonar Sentry. It's a dual pur- Suitland (Md.) KHB36 By January, 1968 pose radio, operable on the AM broadcast Tampa KHB32 By January, 1968 band or, as a fixed -frequency single- or dual - channel VHF receiver. In the VHF mode, The Sentry uses a telescoping whip as an two crystals can be installed, one for receiv- antenna which extends to about 18 inches. ing the Weather Bureau and the other for Though it is not a true FM receiver and has some additional channel. (Continued on page 128)

FEBRUARY -MARCH, 1968 99 Radto-TV . : w : . EXPERIiIEArTEÍI _3 1 12111Z dance is still 10 megohms but the shunt eb capacity is only 20 pF. Similar to the VTVM, the FETVM pro- -/, vides for measuring DC volts, AC volts, and resistance. Nine DC ranges provide full- scale measurement for 0.1 to 10(70 volts using `, t I _t_ 1-3 decading (0.1, 0.3. I, etc.) Nine AC ranges provide full-scale measurement from .01 (10 millivolts) to 300 volts. 71111111111114.,, Six ranges from Rxl to Rxl-megohm pro- vide resistance measurements from 10 ohms to 10 megohms center -scale. Of particular interest to the audio experi- menter and technician is the decibel range calibrated to the AC voltage AMPHENOL MODEL 870 ranges, with 1 VAC equal to 0 dB. The dB ranges decade Field Effect Transistor down to -40 dB (.01 V) and up to +50 dB Portable Voltohmmeter (300V). The associated dB meter scale con- forms to the standard of 1 mW in 600 ohms. Not including the dB scale, the meter face has hut three The service grade VTVM has two out- highly legible scales. The ohms scale is a very standing defects. First, it is not portable- bright, almost three-dimen- sional, red. Two even with a battery power supply the rela- linear black scales are all that's tively heavy current drain of tube circuits used for all AC and DC ranges. There is also a will result in run-down batteries just when center -scale mark for zero -center pointer positioning you need the meter most. Second, the though there is no cali- VTVM's lowest brated zero -center scale. range is about 1 -volt full Just as with the scale-perhaps 0.5 volt if you have a late latest VTVMs, the model. Therefore, the FETVM utilizes a single probe for all func- average experimenter tions-the and technician has always needed an AC- AC-ohms/DC switch is built into VTVM with the probe. The standard zero sensitivity down to 1 millivolt -adjust and to round out the test bench. ohms -adjust controls are also provided. Testing . . . Testing . . . But with the advent of the FET (field ef- As far as ac- curacy is fect transistor), it became possible to design concerned, the Amplenol 870 checked out its rated around the basic VTVM faults, and a modern specifications of 2 per- cent of FETVM, such as the Ainplrenol 870 Field full-scale DC. 3 percent of full-scale AC. For DC Effect Transistor Voltohntnreter, combines measurements, the zero -set ad- justment held the best advantages of the VTVM with port- within t/ of a scale division ability and low -voltage sensitivity. In fact, RANGE SWITCH the An:phenol FETVM provides the per- FUNCTION SWItCH formance of two meters-the VTVM and the AC-VTVM-in one instrument. Fixed Input Z. Unlike transistorized VOMs with input impedances which. though high, still vary depending on the particular range in use, the Amphenol 870 has a fixed input impedance regardless of the range in use. For DC J measurements. the input im- -r" ... pedance is 10.6 megohms. For AC ranges PROBE INPUT from 10 mV to I V, the input impedance is 10 With cover removed, Amphenol megohms shunted by 31 pF. For AC FETVM can be used in ranges from 3 V to 300 V, the conveniently either vertical input impe- or horizontal positions. 100 RADIO -TV EXPERIMENTER (negligible) for all DC voltage ranges. The ,., ON. AC zero set is automatic (there is no front panel adjustment) and, it too, is held on zero A' for all AC ranges. While both the zero- and infinite -ohms adjustment hold with reasonlible accuracy for all resistance ranges, there is no correla- tion between the ohms and DC zero -set con- - trol, and the user must readjust the control when switching between the DC and resist- ance functions. The Amphenol 870 FETVM comes com- plete in a vinyl -covered wood case. The front panel, which contains a storage compartment Rear apron of FETVM contains 10 batteries for the test probe, swings up when the meter and coarse zero adjust control accessible is in a horizontal position, or it can be re - through hole in rear cover.

INPUT

0.1V 0.1V CAL 0.3V CAL

0.3V

1.0V

3.0V

10.0V

30.0V

100.0V

300.0V

1KV

ZERO ADJUST

Simplified circuit of Amphenol FETVM DC circuit. Note use of low-pass filter to remove AC from DC measurements.

moved for both vertical and horizontal view- the larger resistor has no effective relation to ing. A small swing -out bracket on the bottom the total resistance.) of the case permits the meter to be tilted at a The output of the FET amplifier is then slight angle. fed to a transistor booster amplifier/imped- How It Works. The heart of the instru- ance invertor or a meter amplifier. ment is the FET, which is the input amplifier The Circuit. Have a look at the simplified for both the AC and DC functions. Unlike schematic of the DC circuit. A minute volt- the usual transistor, which has a relatively age is tapped off the input voltage divider and low impedance even when connected in the fed to a low pass filter which removes most Darlington configuration, the FET has an in- of any AC component which might be pres- put impedance equal to that of vacuum tubes ent in the DC circuit being measured. This -up around 100 megohms. allows DC to he measured in the presence of If the input voltage divider totals 10 meg- a 60 -Hz voltage 40 dB greater than the full ohms, the connection of the FET's 100- scale value of the DC range. The low pass megohm parallel load will obviously have no filter output is then passed to the FET ampli- effect on the input impedance as the load fier and on to the meter amplifier. represented by the FET is at least 10 times The AC circuit is somewhat different from greater than that of the voltage divider. the DC circuit as can be seen in the second (When two resistors are connected in parallel schematic. Here, instead of the applied volt - and one is ten times the value of the other, (Continued on page 108)

FEBRUARY -MARCH, 1968 101 ñ

á

c

c R

t= ' ° _ ` g That is why 1111I has invest- d more Professional

a ` Lab Equipment than all other home -study schools combined. It makes train- ing at home in Electronics fast and fascinating. Your hands are trained as well as your head.

OLDEST AND LARGEST SCHOOL OF ITS KIND Accredited by th. ACNedItIn(Ce.anisslon e/ the National Nan* Study Ce.nsIt 102 RADIO -TV EXPERIMENTER You get more for your money ' ` 4 ;«+, ;,. from NRI.-more value, more solid experience , .>,ri so essential to careers in Electronics. NRI's pioneering / °re "discovery" method is the result of more than half a .° + , century of simplifying, organizing, dramatizing subject S .eF. - matter. In each NRI's you by : of major courses learn r doing. You demonstrate theory you read in "bite -size" texts programmed with NRI designed -for -learning pro. fessional lab equipment. Electronics comes alive in a unique, fascinating way. You'll take pleasure In evidence you can feel and touch of increasing skills in Electronics, as you introduce defects into circuits you build, per- form experiments, discover the "why" of circuitry and COLOR TV CIRCUITRY COMES ALIVE equipment operation. as you build, stage -by -stage, the only custom Color -TV engineered Almost without realizing it, the NRI discovery method for training. You grasp a professional understanding of all color gives you the professional's most valuable tool-prac- circuits through logical demonstrations never before presented. tical experience. You learn maintenance, installation, The TV -Radio Servicing course includes your choice of black and construction and trouble -shooting of Electronic circuits white or color trailing equipment. of any description. Whether your chosen field is Indus- trial Electronics, Communications or TV -Radio Servicing, NRI prepares you quickly to be employable in this booming field or to earn extra money in your spare ¡ w time or have your own full-time business. And you start out with training equivalent to months-even years 3, -of on-the-job training.

°P NRI Has Trained More Men for . . Electronics Than Any Other

School_ Byactual count, the number of individ- uals who have enrolled for Electronics with NRI could easily populate a city the size of New Orleans or Indiana- polis. Over three-quarters of a million have enrolled with COMMUNICATIONS EXPERIENCE NRI since 1914. How well NRI training has proved its comparable to many months on the job Is yours as you build and value is evident from the thousands of letters we re- use a VTVM with solid-state power supply, perform experiments ceive from graduates. Letters like those excerpted on transmission line and antenna systems and build and work below. Take the first step to a rewarding new career with an operating, phone -ow. 30 -watt transmitter suitable for today. Mail the postage -free card. No obligation. No use on the 80 -meter amateur band. Again, no other home -study salesman will call. NATIONAL RADIO INSTITUTE, school offers this equipment. You pass your FCC exams-or get Electronics Division, Washington, D.C. 20016. your money back.

---..9111111111, - L. V. Lynch, Louis - G. L. Roberts, t vine, Ky., was a Champaign, Ill., factory worker is Senior Tech- %Pa : with American nician at the U. Tobacco Co., of Illinois Coor- "' 0t . now he's an Elec- dinated Science with the Laboratory. In two years he tronics Technician . same firm. "I don't see how received five pay raises. Says the NRI way of teaching could Roberts, "I attribute my pres- be improved." ent position to NRI training." Don House, Ronald L. Ritter Lubbock, Tex., of Eatontown, went into his N.J., received a a own Servicing promotion be- \'%1 !IX* business six fore finishing the months after NRI Communica- ` completing NRI training. This tion course, scorkig one of the former do hes salesman just highest grades it Army pro- COMPETENT TECHNICAL ABILITY bought a new house and re- ficiency tests. He works with ports, "I look forward to mak- the U.S. Army Electronics Lab, can be instantly demonstrated by you on completing the NRI ing twice as much money as I Ft. Monmouth, N.J. "Through course In Industrial Electronics. As you learn, you actually build would have In my former NRI, I know I can handle a job and use your own motor control circuits, telemetering devices work." of responsibility." and even digital computer circuits which you program to solve APPROVED UNDER NEW GI RILL. If you served since January 31, simple problems All major NRI courses include use of transis- 1955, or are In service, check GI line on postage -free card. tors, solid-state cevices, printed circuits.

FEBRUARY -MARCH, 1968 105 f .,C,,.o»,C, , * Starred items'indicaté adver. tisers ti this ,issue:: ponsult ,their 'ads for additional in- formatioh anspecifications. LIBRARY

CB 115. Get the full -AMATEUR RADIO - story on Poly - 10. Burstein-Applebee offers a new :tonics Laboratories' latest CB entry giant catalog containing 100s of big -Carry-Comm. Full 5 -watts, great pages crammed with savings includ- for mobile, base or 130. Bone up on CB with the latest portable use. ing hundreds of bargains on hi-fi kits, Sams books. Titles range from Works on 12 VAC or 117 VAC. power tools, tubes, and parts. "ABC's of CB Radio" to "99 Ways to 100. You can get increased CB range *11. Now improve your CB Radio." So Cir- and clarity using the available from EDi cle 130 "Cobra" trans- (Electronic Distributors, and get the facts from Sams. ceiver with speech compressor Inc.): a cat- -re- alog containing hundreds of electronic *101. If it's a CB product, chances ceiver sensitivity is excellent. Catalog items. are International will be EDI will be happy to place you Crystal has it listed sheet mailed by B&K Division on their mailing in their colorful catalog. Whether kit of Dynascan Corporation. list. or wired, accessory or test gear, this 120. Tab's new CB -oriented company can be relied 54. A catalog for CBers, hams and electronics parts cat- on to fill the bill. experimenters, with outstanding val- alog is now off the press and you're ues. Terrific buys on Grove welcome to have a copy. Some of 96. If a rugged low cost Electron- business/ ics' antennas, mikes and accessories. Tab's bargains and odd-ball items are industrial two-way radio is what unbelievable offers. you've been looking for, be sure to send for the brochure on E. F. John- ELECTRONIC PARTS 117. Harried by the high cost of son Co.'s brand new Messenger "202." *1. Allied's catalog is so widely used parts for projects? Examine Bigelow's 103. Squires-Sanders would like you as a reference book, that its re- 13th Anniversary catalog packed with to know about their CB transceivers, garded as a standard by people in the "Lucky 13" specials. the "23'er" and the new "SSS." Also, electronics industry. Don't you have CB accessories that add versatility to the 1968 Allied Radio catalog? The their 5-watters. surprising thing is that it's free! ELECTRONIC PRODUCTS 128. 46. A long-time builder of ham The new 1968 If you can hammer a nail *2. Edition of Lafay- and miss your equipment. Hallicrafters will send you ette's catalog features sections on thumb, you can as- lots of info on ham. CB and com- semble a Schober organ. To prove the stereo hi-fi, CB, ham gear, test equip- point, will mercial radio equipment. ment, cameras, optics, tools and Schober send you their much catalog and a 7 -in. *129. Boy, oh boy -if you want to more. Get your copy today. disc recording. read about a flock of CB winners, get *102. Before you buy your twit 126. Delta Products new caEracitive your hands on Lafayette's new 1968 mat, get ahold of Sentry' s 1968 cata- discharge ignition system in kit form catalog. Lafayette has CB sets for all log. will pep up pocketbooks. Sentry lists the best in precision your car. Designed to quartz crystals and communications cut gas costs and reduce point and 122. Discover the most inexpensive goodies. Check off 102 now! plug wear. Get Delta's details in full - CB mobile, color literature. Citi-Fone 11 by Multi- *8. Get it Elmac Company. Get the now! John Meshna, Jr.'s facts plus new 46 -page catalog is Jam other CB product data before you packed *42. Here's a colorful 108 -page cat- buy. with surplus buys -surplus radios. alog containing a wide assortment of new parts, computer parts, etc. electronic kits. 50. Get your You'll find something copy of Amphenol's 23. No for any interest, any budget. And "User's Guide to CB Radio" electronics bargain hunter -18 should be caught Heath Co. will happily send you a pages packed with CB know-how and without the 1968 copy. chit-chat. Also, Arnphenol will copy of Radio Shack's catalog. Some let equipment and kit you know what's new on their prod- offers are so low, *44. Get your copy of EICO's uct line. they look like misprints. Buying is believing. colorful 36 -page catalog on 200 "best 121. Going CB? Then go buys" products. Ham radio, CB, hi- CB Center 5. test of America. Get their catalog and Edmund Scientific's new cata- fi, gear, both wired and kit, are discover the big bonus offered with log contains over 4000 products that illustrated. each major product -serves all 50 embrace many interests and fields. It's states. a 148 -page buyers' guide for Science *125. Need TV camera kit, touch Fair fans. control lamp, hi-fi component, test 107. Want a deluxe CB base station? unit or shop gear? Then you need Then get the specs on Tram's all new 106. With 70 million TV and 240 Conar's latest catalog. Born from Titan II -it's the SSB/AM rig you've million radios somebody somewhere NRi, Conar has become a major sup- been waiting fort will need a vacuum tube replacement plier of electronics hobbyist parts. at the rate of one a second! Get Uni- 116. Pep-up your CB rig's perfor- versal Tube Co.'s Troubleshooting 66. Try instant lettering to mark mance with Turner's M-4-2 mobile Chart and facts on their flat microphone. Get $1 rate control panels and component parts. complete spec sheets per tube. Datak's booklets and data on other Turner mikes. and sample show *4. Olson's catalog is a this easy dry transfer method. 48, Hy -Gain's new multi- CB antenna cata- colored newspaper that's packed with log is packed of 109. Seco offers a line of special- full useful informa- more bargains than a phone book has tion and product data that every ized and standard test equipment names. Don't believe us? Get a copy. CBer should know. Get a copy. that's ideal for the home experimenter and 111. *7. Before you build from scratch pro. Get specs and prices today. Get the scoop on Versa- check the Fair Radio Sales latest Trontes' Versa-Tenna cat- with instant alog for electronic gear that can be magnetic mounting. Antenna models modified to your needs. Fair way to SCHOOLS AND EDUCATIONAL available for CBers, hams and mobile save cash. units from 27 MHz to 1000 MHz. *61. ICS (International Correspond- *6. Bargains galore, 45. Hams, that's what's ence Schools) wants to send you a CBers, experimenters! in store! Poly-Perks Co. will send you 64 -page booklet on the World Radio Labs 1968 most often catalog is a their latest eight -page flyer listing the asked questions on preparing for an bargain hunter's delight. Get your latest in available merchandise, in- copy free. electronics career. You also get "How -it's cluding a giant SI special sale, to Succeed" and a sample ICS lesson. 106 RADIO -TV EXPERIMENTER *74. A 40 -page illustrated book on 131. Let Elpa send you "The Rec- 34. "All the Best from Sony" is an "How To Succeed In Electronics" ord Omibook." It's a great buy and 8 -page booklet describing Sony -Super - anda 24-page book on 'How to Get Elpa wants you to have It free. Your scope products-tape recorders, mi- a Commercial FCC License" are records will thank you when the mail- crophones, tape and accessories. Get yours for the asking from Cleveland man delivers it. a copy before you buy! Institute of Electronics. 16. Garrard's Comparator Guide 35. If you are a serious tape audio- 114. Prepare for tomorrow by clues ou in on the new Syndrro-Lab phile, you will be interested in the studying at home with Technical turntable/changer series. Discover all new Viking/Telex Une of quality Training International. Get the facts how Garrard locks on to the correct tape recorders. today on how you can step up in disc speed. your present job. 17. Mikes, speakers, amps, re- HI-FI ACCESSORIES 5T. For a rundown on complete ceivers -you name it, Electro -Voice 112. Telex would like you to know curriculum, lesson outlines, and full makes it and makes it good. Get the a electronic about their improved Serenata Head- details from leading straight poop from E -V today. set -and their entire line of quality school, ask for this brochure from the stereo Indiana Home Study Institute. 19. Empire has made exceptional headsets. advances in speaker cabinet design 98. Swinging to hi -fl stereo neaa- 105. Get the low-down on the latest you should read about. Also, Em- sets? Then get your copy of Superes in educational electronic kits from pire's successes in the turntable and Electronics' 16 -page catalog featuring Trans-Tek. Build light dimmers, cartridge fields are worth discovering. a large selection of quality headsets. amplifiers, metronomes, and many more. Trans-Tek helps you to learn 27. 12 pages of Sherwood receivers, 104. You can't hear FM stereo un- while building. - tuners, amplifiers, speaker systems, less your FM antenna can pull 'em in. and cabinetry make tip a colorful Learn more and discover what's avail- *3. Get all the facts on Progressive booklet every hi -ti bug should see. able from Finco's 6-pager "Third Jt Edu-Kits Home Radio Course. Build mensional Sound." 20 radios and electronic circuits; 95. Confused about stereo? Want to parts, tools and instructions come beat the high cost of hi-fi without with course. compromising on the results? Then TOOLS you reed the new 24 -page catalog by, *78. Need pliers to hold, bend or Jensen Manufacturing. cut fine wires? Check Xcelire's new HI-FI/AUDIO 99. line of miniatures shown in Catalog Get the inside info on why 166 along with a complete selection 124. Now, Sonorone offers you Telex/Acoustech's solid-state ampli- of regular pliers and snips. young ideas in microphone use in fiers are the rage of the experts. Col- their new catalog. Mikes for talk ses- orful brochure answers all your ques- 118. Secure coax cables, speaker sions, swinging combos, home record- tions. wires, phone wires, etc., with Arrow ing, PA systems and many more uses. staple gun tackers. 3 models for wires and cables from 3/16" to Ye" dia 26. a H. H. Scott Always leader, TAPE RECORDERS AND TAPE Get fact -full Arrow literature. introduces a new concept in stereo console catalogs. The information - 123. Yours for the asking-Elpá s packed 1968 Stereo Guide and catalog new "The Tape Recording Omni - TELEVISION are required reading for audio fans. book." 16 jam-packed pages on facts *70. Need a new TV set? Then as- 85. Write the specs for an ideal and tips you should know about be- semble a Heath TV kit. Heath has preamp and amp, and you've spelled fore you buy a tape recorder. all sizes. B&W and color, portable out Dyraco's stereo 120 amp and and fixed. V. by not build the next PAS-3X preamp. So why not get all 31. All the facts about Concord TV you watch? the facts from Dynacol Electronics Corp. tape recorders are yours for the asking in a free book- 127. National Schools will help you 119. Kenwood puts it right on the let. Portable, battery operated to four. learn all about color TV as you line. The all -new Kenwood stereo -FM track, fully transistorized stereos cov- assemble their 25 -in. color TV kit. receivers are described in a colorful er every recording need. lust one of National's many exciting 16 -page booklet complete with easy - and rewarding courses. to -read -and -compare spec data. Get 32. "Everybody's Tape Recording 97. Interesting, helpful brochures your copy today! Handbook" Is the title of a booklet that Sarkes-Tarzian will send you. describing the fV antenna discovery 15. Acoustic Research would like to It's 24-pages jam-packed with Info for of the decade -the log periodic an- send you literature on their speaker the home recording enthusiast. in- tenna for VHF and UHF -TV, and systems and turntable. It's "must cludes a valuable table of recording FM -stereo. Get it from JFD Elec- have" literature before you buy. times for various tapes. tronics Corporation.

re RADIO -TV EXPERIMENTER Dept. 268 Indicate total number of tooklets requested 505 Park Avenue New York, N. Y. 10022 1 2 3 4 5 6 7 8 10 11 Please arrange to have the lit- 15 16 17 19 23 26 27 31 32 34 erature whose numbers I have 42 46 48 50 54 59 61 circled sent to me as soon as 35 44 45 possible. I am enclosing 25 for 66 70 74 78 85 95 96 97 98 99 1 to 10 items; 50C for 11 to 20 103 105 106 107 109 111 items to cover handling. No 100 101 102 104 stamps, please. 112 114 11E 116 117 118 119 120 121 122 11.20 items 123 124 125 126 127 128 129 130 131 1-10 items NAME (Print clearly)

ADDRESS k 1' 25/ v, ta CITY CHECK ONE STATE Z I P maximum number of items= 20

FEBRUARY -MARCH, 1968 107 things, this method provides for the very low .01 V range and 3 percent accuracy between CHECK 50 and 50,000 Hz. And it's this range that effectively makes the Amphenol 870 a com- Continued from page 101 bined FETVM and an AC-FETVM. Summing Up. Within the limitation of the 300 V maximum AC range, the Amphe- nol 870 FETVM can be considered as a sub- stitute for both a standard VTVM and an AC-VTVM, realizing the advantages of portability and price since the cost of the 870 is less than that of the two instruments it re- METER places. Also, while the low -voltage AC ranges

KNOWN GAIN (OHMS ADJ) RESISTANCE (INTERVAL)

METER

FETVM AC circuitry employs only two voltage divisions for input voltage to keep signal level to FET high. Resistance measuring circuit of FETVM age appearing across the normal voltage is conventional providing six ranges to read divider, the input voltage is divided only from 10 ohms to 10 megohms center scale. twice for a high and low range. One reason for this is to provide a high-level signal to the are particularly useful in audio service work, FET in order to prevent internal noise from the very -low -voltage DC range of 0.1 V full- interfering with very low voltage measure- scale makes the instrument exceptionally ments. useful for transistor servicing where voltages The output of the two-step divider is then in the range of 0.1 to 0.5 volt are the rule fed to the impedance invertor which consists rather than the exception. of the FET and its associated transistor am- The Amphenol 870 FETVM is priced at plifier. The relatively high level output of the $99.95 including the case, probe and bat- impedance invertor is now fed to a voltage teries. For more information write to the divider where the voltage is tapped off for Amphenol Distributor Div., Amphenol the meter amplifier. While at first glance this Corp., Dept. DF, 2875 S. 25th Ave., Broad- might appear to he the hard way of doing view, Ill. 60153.

. \.. . i-, ,4.. .

As substitute for both VTVM and AC-VTVM, the Amphenol FETVM provides :';' the user with a substantial number of useful features .m at a reasonable cost.

108 RADIO -TV EXPERIMENTER Will 'TE'S

di%

Volume 49, No. 1

An up-to-date Broadcasting Directory of North American AM, FM and TV Stations, including a Special Section on World -Wide Shortwave Stations

In this issue of White's Radio Log we have following listings: U.S. AM Stations by Call included the following listings: U.S. AM Letters, U.S. FM Stations by ('all Letters, Stations by Frequency, Canadian AM Sta- Canadian AM Stations by Call Letters, Cana- tions by. Frequency, U.S. Television Stations dian FM Stations by Call Letters, and an ex- by States, Canadian Television Stations by panded World -Wide Shortwave Section. Cities, and World -Wide Shortwave Stations. Therefore. in any three consecutive 1968 In Our Next Issue, April -May, 1968, issues of RADIO -TV EXPERIMENTER maga- the Log will contain the following list- zine, you will have a complete cross-refer- ings: U.S. AM Stations by Location, U.S. ence listings of White's Radio Log that is FM Stations by States, Canadian AM Sta- always up-to-date. The three consecutive tions by Location, Canadian FM Stations by issues are a complete volume of White's Ra- Location, and an expanded Shortwave dio Log that offers up to the minute listings Section. The shortwave listings ere always that are not to he found in any other magazine completely revised in each issue of Log to or book. If you are a broadcast band DX'er, insure 100 percent up-to-date and accurate FM station logger, like to photograph dis- information. tant TV test patterns, or tune the shortwave In the June -July, 1968 issue of RADIO -TV bands, you will find the new -Vhite's Radio EXPERIMENTER, the Log will contain the Log format an unbeatable reference. O

QUICK REFERENCE INDEX U.S. AM Stations by Frequency 110 Canadian AM Stations by Frequency 120

U.S. Television Stations by States 121 Canadian Television Stations by Cities 124 World -Wide Shortwave Stations .. 125

FEBRUARY -MARCH, 1968 109 ¡WMITE'S SLr U.S. AM Stations by Frequency L ") 0 U. S. stations listed 0 alphabetically by states within groups. Abbreviations: kHz. frequency in kilocycles: W.P., power in watts: it, operates daytime only; n. operates nighttime only. Wave length lo given in meters. Listing indicates ao@ statlons u,, the air on October I, IOW kHz Wave Length W.P. kHz Wave Length W.P. Ws Wave Length W.P, kHz Wave Length W.P. 540-555.5 W BAP Ft. worth. Tex. KLUB 5000 KAVL Lancaster, Calif. 1000 . Utah 5000 KFRC San 680-440.9 KVIP Heddlne. Calif. 50000 KVI . Wash. Francisco, Calif. 5000 KFMB 5000 W TOR Torrington. Conn. KNBH San San Dieta. Calif. 5000 WMAM Marinette, Wis. 1000 Franclsco,'C:d. 50000 WGTO Cypress Gardens, 2504 WIOD Miami. Fla. 5000 WPM St. Petersburg, Fla. W MEL 10000 Fla. 50000d Pensacola. Fla. 500d WRNG N. Atlanta. Ga. 5000 WDAK 580-516.9 WCEH Hawkinsvllle. Ga. 500d WCTT Columbus. Ga. 5000 WABT Corbin. Ky. 1000 KWMT Ft. Dodge, Iowa Tuskeeee. Ala. 500d KUAM Agana, Guam 10000 WCBM Baltimore. Md. 10000 5000d K I KX KNOE Monroe, La. 5000 Tucson, Ariz. 5000 WRUS Russellville. Ky. 500d W R KO Boston, Mass. 500011 WDMV KM1 Fresno. Calif. KDAL Duluth. Minn. WDBC Pocomoke City, Md. 500d KUBC 5000 5000 Escanaba. Mich. 10000 WLIX Islip. N.J Montrose, Colo, 5000 WDAF Kansas City. Mo. 5000 KFEQ St. Joseph. Mo. 250d WDBO K 5000 WETC Wendell-Zebuton, Orlando. Fla. 5000 0 M Havre, Mont. 1000 WINR Binghamton. N.Y, 1000 ' WGAC Augusta, Ga. KCSR Chadron, Nebr. WNYR N.C. 250d KFXD 5000 I000d Rochester, N.Y. 250 WARO Canonsburg, Pa. 250d Nampa, 5000 WGIR Manchester, N.H. 5000 WPTF Raleigh, N.C. 50000 WYNN Florence, WILL Urbana, 111. 5000d KGGM Albuquerque, N.Mex. 5000 WISR Butler. Pa. S.C. 250d KSAC WAYS 250d WDXN Clarksville, Tenn. I000á Manhattan. Kans. 5000 Charlotte, N.C. 5000 WAPA San Juan. P.Rico. 10000 WRIG WIBW Topeka, Kans. WTVN Columbus. Ohio W MPS Memphis. Richlands. Va. I000á KALB 5000 WIP 5000 Tenn. 10000 WYLO Jackson, Wise. 250d Alexandria. La. 5000 Philadelphia, Pa. 5000 )(BAT San Antonio. Tex. 50000 WTAG Worcester. Mass. 5000 KILT Houston, Tea. 5000 KOMW ()milk. Wash. WELD KVNU Logan, 1000d 550-545.1 Tupelo, Miss. 1000 Utah 5000 WCAW Charleston, W.Va. 10000d KANA Anaconda. Mont. 1000 WSLS Roanoke. Va. 5000 KENI Anchorage, Alaska 50 00 WAGR Lumberton, N.C. 500 WHPL Winchester. Va. 500 690-434.5 KOY Phoenix, Ariz. 50 KWIN Ashland. Oreg. 1000 KEPR Kennewick -Richmond 00 WVOK Birmingham, Ala. 50000d HAFT Bakersfield. Calif. 10 00 WHP Harrisburg, Pa. 5000 Pasco. Wash. 5000 KRAI WKAQ K EOS Flagstaff, Ariz. 1000 Craig, Colo, 10 00 San Juan, P.R. 5000 KEVT WAY R Orante Park, KOBH Hot Springs, 620-483.6 Tucson, Ariz. 2500 Fla. 100 Od S.Dak. 500d KBBA Benton. Ark. W GGA Gainesville. Ga. 50 WRKH Rockwood, Tenn. I000d KTAR Phoenix. 250d 1(D A V Ariz. 5000 KAPI Pueblo. Colo. 250d KMVI Waifuku. Hawaii S 000000 Lubbock. Tex. 500d KNOS KFRh1 Hanford. Calif. 1000 WADS Ansonia, Conn. S00d Salina, Kans. 500 Od WLES Lawrenceville, Va. 500d KWSD hit. Shasta, Calif. 1000d WAPE Jacksonville. Fla. 50000 WICB Columbus. Miss, 10 00 WCHS Charleston. W.Va. 5000 KSTR Grand KSD W KTY Junction, Colo. 5000d KKUA Honolulu, Hawaii 10000 St. Louis, Mo. 5000 LaCrosse. Wis. 5000 WSU N St. Petersburg. KBOW Butte, Mont. Fla. 5000 KBLI Blackfoot. Idaho I000d 1000 WTRP LaGrange. Ga. 1000d KGOF Kans. WGR Buffalo, N.Y. 50 00 590-508.2 KWAL Coffeyville. 10000 WDBMI Wallace. Idaho 1000 WTIX New Orleans. La. 5000 Statesville, N.C. 50 Od KHAR Anchorage, Alaska 5000 Kh1NS Sioux City. Iowa 1000 NTCR KFYR Bismarck. N.Dak. Minneapolis, Minn. 500d 50 00 WRAC Carrollton, Ala. I000á WT5IT Louisville, Ky. 500d KSTL St. Louis. Mn. W KRC Cincinnati. Ohio 50 KBHS 1000d 00 Hot Springs. Ark. 5000d WLBZ Bangor, Maine 5000 KEYR Tarrytown, Nebr. KOAC Corvallis. Oreg. 50 00 KFXM WJDX Jackson, Miss. 1000d San Bernardino. Cal. 1000 5000 KRCO Prineville. Oreg. 10000 WHIM Bloomsburg. Pa. 10 00 KTHO So. WVNJ Newark, Lake Tahoe, Cal. 1000 N.J.' 5000 WXUR Media, Pe. s WPAB Ponce. P.R. 5000 KCS1 WHEN 5000 Pueblo. Colo. 1000 Syracuse. N.Y, 5000 KUS) Vermillion. S.Dak. 1000d WXTR Pawtucket, R.I. 10 00 WDLP Panama WDNC Durham. KCBS City. Fla. 1000 N,C. 5000 KHEY El Paso. Tex. 10000 Midland, Tex. 5000 WPLO Atlanta. Ga. KGW Portland. Oreg. KTSA San Antonio, Tex. 5000 KPET Lamesa, Tex. 250 50 00 KG MB Honolulu, Hawaii 5000 WHOB Greensburg. Pa. ÍÓ00 WDEV Waterbury. Vt. 50 KZEY Tyler. Tex. 5000 00 KID Idaho Falls, Idaho 5000 WCAY Cayce, S.C. 500d WCYB Va. WSVA Harrisonburg. Va. 5000 WATE Bristol, 100000 WRTH Wood River, III. 1000 Knoxville, Tenn. 5000 WNNT Warsaw. Va. KARI Blaine, Wash. 500 Od KWFT Wichita 250d WVLK Lexington. Ky. 5000 Falls. Tex. 5000 WELD Fisher. W. Va. WSAU Wausau, Wis. 50 00 W E E I WVMT Burlington, 5000 Boston, Mass. 5000 Vt, 5000 W AGO Oshkosh. Wis. W KZO Kalamazoo, Mich. 5000 WWNR Beckley. W.Va. 1000 560-535.4 KOLE Glendíve, Mont. 500d WTMJ Milwaukee. Wis. 5000 700-428.3 WOW Omaha, Nebr. WOOF Dothan, Ala. 500Od 5000 630-475.9 WLW Cincinnati. Ohio 50000 KYUM Yuma, Ariz. WROW Albany. N.Y. 5000 10 00 WGTM Wilson. N.C. KSFO San Fran., Calif. 50 00 5000 WAVU Albertville, Ala. I000d 710-422.3 KLZ Denver, KUGN Eugene, Ores. 5000 WJDB Thomasville. Ala. Colo. 50 00 WARM I000d WKRO Mobile. Ala. 1000 WQAM Miami, Fla. Scranton. Pa. 5000 KYAK Anchorage, Alaska KMPC 50 00 W MBS Uniontown, Los Angeles, Calif. 50000 WIND Chicago. III. 50 00 Pa. 1000 KiN0 Juneau, Alaska 1000 KBTR Denver. Colo. KTBC Austin. Tex. 5000 5000 WMIK Middlesboro, Ky. 50 Od KVMA Magnolia. Ark. I000d WGBS Miami. Fla. WGAN Portland. KSUB Cedar City, Utah 1000 KIDD Monterey, 50000 Maine 50 00 WLVA Lynchburg. Calif. 1000 W U F F Eastman, Ga, 1000d WFRB Frostburg. hid. 10 Va. 1000 KHOW Denver, Colo. 00 KHQ Spokane, Wash. 5000 WROM Rome: Ga. 1no0d WHYN Springfield. Mass. 50 00 5000 WMAL Washington, D.C. 5000 KEEL Shreveport. La. WSAV 50000 WQTE Monroe, Mich. 50 Oil 600-499.7 Savannah. Ga. 5000 WHB Kansas City. Mo. 10000 W EBC Duluth. Minn. 50 WNEG Toccoa, Ga. 500d WOR New York. N.Y. WIRB Ala. KIDO Boise. 50000 KWTO Springfield. Mo. 50 0000 Enterprise. 1000 Idaho 5000 DZRH Manila. P.1. 10000 MOON Great Falls. Mont. 50 00 KCLS Flagstaff. Ariz. 5000 WLAP Lexington. Ky. 5000 WK1B Mayaguez. P.Rico 1000 K KTIB WGAI Elizabeth City. N.C. 10 00 VCV Redding. Calif. 1000 Thibodaux. La. 500d WTPR Paris, Tenn. 250d WFIL Philadelphia. Pa. 50 00 KOGO San Diego, Calif. 5000 WIMS Ironwood. Mich. 1000 KGNC Amarillo. KZ KDWB Tex. 10000 WIS Columbia. S.C. 5000 IX Ft. Collins, Colo. 1000d So. St. Paul. Minn. 5000 KURV Edinburg, Tex. 250 WHBQ Memphis, Tenn. 5000 WICC Bridgeport. Conn. 5000 KXOK St. Louis. hio. 5000 KIRO Seattle. Wash. 50000 K LVI Beaumont. Tex. 50 00 WPDQ Jacksonville. Fla. 5000 KGVW Belgrade, bloat. 1000d WDSM Superior. Wis. 5000 KPQ Wenatchee. Wash. 50 00 W MT Cedar Rapids. Iowa 5000 KOH Reno Nev. 5000 WJ,LS Beckley, W.Va, WWOM New Orleans, La. I000d KLEA Lovington, N.Mex. 500d 720-416.4 5000 WIRC WEST Caribou. Maine 5000d Hickory. N.C. I000d KUAI Eleele, Hawaii WCAO Baltimore. hid. WMFD Wilmington, N.C. 5000 570-526.0 5000 1000 W GN Chicago. Ill. 50000 WLST Escanaba, Mich. 10000 1(W RO Coquille. Oreg. 5000d WAAX Gadsden, Ala. 5000 WTAC Flint, Mich. W EJL Scranton. Pa. KCNO 1000 500d 730-410.7 Alturas, Calif. 5000 KGEZ Kalispell. Mont. 1000 WKYN San Juan, P.R. 5000 KLAC Los Angeles, Calif. 5000 WCVP Murphy, N.C. WPRO Providence. WJMW Athens, Ala. 1000 1000d R.I. 5000 KSUD W. Memphis, Ark. WGMS Washington, D.C. 5000 WSJS Winston-Salem- N.C. 5000 KMAC San Antonio. Tex. 5000 250d WLOR Thomasville, Ga. WFSO Pinellas Park, Fla.. 500d KSJB Jamestown. N.D. 5000 KSXX Salt Lake City. Utah 1000d 5000d WACL Waycross, WSOM KLOE Goodland, Kans. 1000d Ga. 5000 Salem, Ohio 500d KGDN Edmonds, Wash, 5000 WFMW WKYX Paducah, Ky. 1000 WFRM Coudersport. Pa. KZUN Opportunity, Madisonville. Ky 500 I000d Wash. 500d W MTC Van Ky. WVMI Biloxi. Miss. 1000d WAEI Mayaguez, P.R. 1000 Cleve, I000d KTRY Bastrop. La. KGRT Las Cruces, N.Mex. 5000d WREC Memphis. Tenn. 5000 640-468.5 250d WMCA New York, N.Y. 5000 KROD El Paso. Tex. WARB Covington, La. 250d 5000 KFI Los Angeles. Calif. 50000 W1TO Bath, Maine WSYR Syracuse. N.Y. 5000 KERB Kermit. Tex. 1000á 100110 WWNC WO1 Ames, Iowa 5000d WACE Chicopee, Mass, 5000d Asheville, N.C. 5000 KTBB Tyler. Tex. 1000 W H LO Akron. WLLE O. I000d WVIC E. Lansing, Mich. 500 Raleigh. N.C. 500d WVAR Rlchwood, W.Va. I000d WNAD Norman. W KBN Youngstown, Ohio 5000 Okla. 1000d KWRE Warrenton, Mo. 1000d WNAX Yankton. S.Dak. 5000 610-491.5 KWOA Worthington. Minn. 10000 Tex. 650-461.3 KURL Billings, Mont, WFAA Dallas, 5000 WSGN Birmingham, Ala. 5000 500d KORL Honolulu. Hawaii 10000 KVOD Albuquerque, N.Mex. 1000d WSM Nashville, Tenn. WDOS Oneonta, N.Y. KIKK 50000 1000d Every effort has been Pasadena. Texas 250d WFMC Goldsboro, N.C. 1000d made to insure accuracy of the WOHS Shelby. N.C. 1000d information listed in this publication, but 660-454.3 W M GS Bowling Green. Ohio 1000d absolute I(BOY Medford. accuracy is not KFAR Fairbanks, Alaska 10000 Oreg. 10000 guaranteed and, of course, only in- KO W H WNAK Nanticoke. Pa. I000d Omaha, Neb. 1000d WPIT formation available up to press -time could be in- WNBC New York, N.Y. 50000 Pittsburgh, Pa. 50000 W ESC Greenville. S.C. 10000d WPAL Charleston, S.C. 10000 cluded. Copyright W LI L 1967 by Science 8 Mechanics Pub- KSKY Dallas, Tex I0000d Lenoir, Tenn. 10000 lishing Co., a subsidiary of Davis KPCN Grand Prairie, Tex. 5000 Publications, Inc., KSVN Ogden, Utah 10000 505 Park 670-447.5 WPI K Alexandria, Ya. Avenue, New York, New York 10022. - WMAQ 5000d Chicago. III. 50000 W 51 N A Gretna. Va. 1000d 110 RADIO -TV EXPERIMENTER kHz Wave Length W.P. kHz Wave Length W.P. kHz Wave Length W. P. kHz Wave Length W.P.

K ULE Ephrata, Wash. 1000d KINY Juneau. Alaska 50 00 KSHA Medford, Oreo. 1000d WPFB Middletown, Ohlo 1000 WXMT Merrill. Wis. I000d 1

FEBRUARY-MARCJJ, 1968 111 WHITE'S kHz Wave Length W.P. kHz Wave Length W.P. kHz Wave Length W,P, WDLM E. Moline, Ill. 1000d 1

112 RADIO -TV EXPERIMENTER W.P. kHz Wave Length W.P. kHz Wave Length W.P. kHz Wcve Length _ W.P. kHz Wave Length WCOK Sparta. N.C. 250d WPHC Waverly, Tenn. 1000d KCBQ San Diego. Calif 50000 KFPW Ft. Smith, Ark. 1000 1( BTSI Jonesboro, Ark, 1000 W010 Canton. O. 5000d KDRY Alamo Heights, Tex, I000d I(LOK San Jose, Calif. 10000 50000 I(OHO Honolulu, Hawaii 1000 KCON Conway, Ark. 1000 KYW Philadelphia, Pa. 1000 German, P. R. 250 1120-267.7 WLBH Mattoon, Ill. 250d KGEE Bakersfield, Calif. WRJS San Barstow. 1000 C. I000d WUST Bethesda. Md. 250d KSTT Davenport. lows 1000 KWTC Calif. WALD Walterboro. S. KUBS Bishop, Calif. 1000 WPHC Waverly, Tenn. IOOOd KMOX St. Louis. Me. 50000 KV00 Tulsa. Okla. 50000 I000d WLEO Ponce, P.R. 250 K XO El Centro, Calif. 250 WCIR Beckley, W.Va. I0000d WWOL Buffalo. N.Y. 250 Tex. KPIR Eugene. Ore. 50000 KPUG Bellingham, Wash. 5000 ifDAC Ft. Bragg, Calif. KHRB Lockhart, I(GF1 Los Angeles, Calif. 1000 KRSP Salt Lake Clty, Utah KCLE Cleburne. Tex. 250d WWVA Wheeling. W.Va. 50000 WLKE Wanton, Wis. I(PRL Paso Robles, Calif. 1000 1070-280.2 1130-265.3 I(RDG Redding. Calif. 250 1180-254.1 K W G Stockton, Calif 1000 WAPI Birmingham, Ala. 50000 KRDU Dlnuha, Calif. 1000 1000 Jacksonville. III. 10001 if EXO Grand Junction, Colo. KNX Los Angeles. Calif. 50000 KSDO San Diego. Cal. 5000d WLDS Colo. 250 WHAM N.Y. 50000 KBRR Leadville, WVCG Coral Gables. Fla. I000d WLBA Gainsville, Ga. 1 00001 Rochester. KDZA Pueblo, Colo. I000d W1BC Indianapolis. Ind. 50000 KLE1 Keilua, Hawaii 1000 I

FEBRUARY -MARCH, 1968 113 W W ITE'S kHz Wove Length W.P. kHz Wave Length W.P. kHz Wave Length W.P. I(BIZ Ottumwa, Iowa 1000 KDHI Twenty.Nine Palms, KW FR San Angelo, TeX, I000d I(1CD Spencer. Iowa 1000 California I000d I(TUE Tulia, Teo. 1000d I(IUL Garden City, Kans. 1000 KMSL QaDI Ukiah, Calif. 500d KTAE Taylor, Tex. 1000d ao KAKE Wichita, Kans. 250 K1Ch1 Golden, Colo. 10000 WCHV Charlottesville, Va. 5000 WINN Louisville, I(y. 1000 WNER Live Fla. WFTM Maysville, Oak. I000d Will Christiansburg, Va. I000d Ky. 1000 WDAE Tampa, Fla. 5000 I(WIQ Moses WPKE Pikeville, Ky. WLYB Lake, Wash, 1000d I000d Albany, Ga, 1000d WVVW Grafton. W.Va. aó@ WSFC Somerset. Ky. 1000 WYTH 590 Madison, Ga. 1000d W W IS Black River KASO Minden, La. 1000 WIZZ Streator, Falls. KANE Ill. 5003 W le. 1000d New Iberia. La. 1000 WGL Ft. Wayne, Ind. 1000 WCOU Lewiston. WEI(Z Monroe. Wis, 1000d kHz Wove Length W.P. Maine 1000 WRAY Princeton. Ind. I000d WOCO Oconto, Wis. W M KR Millinocket. Me. 1000 (CFI Cedar Falls. Iowa WCEM Cambridge, Md. 500d KPOW Powell. Wyo. 5000 KRNS Burns. 1000 KF KU Lawrence, Kans, 5000 Ore. 1000 WJEJ Hagerstown, Md. 1000 WREN Topeka, (ans. KOOS Coos Bay, Ore, 1000 WHAT 5000 1270-236.1 Greenfield, Mass. 250 WNVL Nlcholasviile, Ky, 500 (ROB Gresham. Oreg. 1000 WOCB W. Yarmouth, Mass. 1000 WGSV Guntersville. KYJC Medford, WLCK Scottsville. Ky. 500d Ala, I000d Oreg. 1000 WATT Cadillac, Mich. 1000 WGUY Bangor. Maine WZAM Prichard. Ala. I000d KQIK Lakeview, Ore. 1000 5000.1 WCBY Cheboygan, Mich. 1000 WARE Ware. I(BYR Anchorage. Alaska 1000 KTDO Toledo, Ore. 1000 Mass, 1000 WWI) Ishpeming, Mich. 1000 WXOX Bay City. Mich, KDJI Holbrook, Ariz. 5000d WBVP Beaver Falls, Pa. 1000 WIIM 1000 Lansing. Mich. I000d KOTE Fergus Falls, Minn. 1000 I(ADL Pine Bluff. Ark. 5000d WEEX Easton. Pa. 1000 W 51FG Hibbing, Minn. 1000 I(BLC W I(CUE Red Wing, Minn, 1000d Lakeport. Calif. KBO Harrisburg, Pa. 1000 KPRM Park Rapids. Minn, 1000 KGOL Palm Desert, WCRO Johnstown. WHNY MeComb, Miss, 5000 Cal. 500d Pa. 1000 WJON St. Cloud, Minn. 1000 I(FM0 Flat KCOl( Tulare. Calif. 5000d WBPZ Lock Haven. Pa. 1000 WMPA River. Mo. 1000 Aberdeen. Miss. 1000 KBTC Houston. hto, I000d WNOG Naples, Fla. 500d WTIV Titusville, Pa. 1000 WGRM Greenwood, toliss. 250 WHIY Orlando. Fla. WNIK Arecibo, P.R. 1000 WKBR Manchester, N.H. 5000 5000d WGCM Gulfport. Miss. 1000 WMTR WTNT Tallahassee, 5000 WERI Westerly. R.I. 1000 Morristown. N.I. 5000d Fla. W MIS Natchez, Miss. 250 WIPS Ticonderoga. N.Y. I000d WKRW Cartersville, Ga. 500d WAIM11 Anderson, S.C. 1000 KW.OS Jefferson WNOK City, Mo. I000d WFAG Farmville, N.C. 500d WHYD Columbus, Ga. 5000d Columbia. S.C. I000d KODE Joplin, Mo. I000d WKDX WJJC Commerce, Ga. WOLS Florence, S.C. 1000 Hamlet, N. C. 1000d I000d KNEM Nevada. Mo. 250 WBRM Marion. N.C. I000d ICNDI Honolulu, Hawaii 5000 KISO Sioux Falls, S.Dak. 1000d KBMY Billings. Mont. 1000 I(TFI WAKI McMinnville, 1000 WCHO Washington Court Twin Falls, Idaho 5000 Tenn. KLTZ Glasgow, Mont. 1000 W EIC Charleston. III. KSIX Corpus Christi. Tex. 1000 House, Ohio 500d I000d I(BLL Helena, Mont. 1000 WLEM Emporium, W H BF Rock Island. KDLK Del Rio. Tex. 250 KFOR Pa. 1000d Ill. 5000 Lincoln, Nebr. 1000 WPEL Montrose, Pa. I000d WCM1lR Elkhart. Ind. 5000 KNUZ Houston. Tex. 1000 KODY North Platte. Nebr. 1000 KERV Kerrville, Tex. 1000 WTAE Pittsburgh, Pa,- ' 5000 WWCA Gary. Ind. 1000 1(ELK Elko, New. 1000 W NO W York, Pa. WORX Madison, Ind, I000d KLVT Levelland, Tex. 1000 WFTN Franklin. N.H. 250 SOOOd WTMA Charleston, S.C. 5000 KSCB Liberal, Kans. 1000 KEEE Nacogdoches, Tex. 1000 WSNJ Bridgeton, N. J. 1000 KOSA Odessa. Tex. WCKM Winnsboro. S.C. 500d WAIN Columbia, Ky. I000d 1000 KAVE Carlsbad. N.Mex. 1000 W KGRO Pampa, Tex. 250 KBL Covington. Tenn, I000d WFUL Fulton, My. 1000d ICCLV Clovis. N.Mex. 1000 W KYZ KVCL La. KSEY Seymour, Tex. 1000 WGBB Madisonville. Tenn. Winnfield, 1000d Freeport, N.Y. 1000 WNTT Tazewell. Tenn, WKYR Cumberland, Md. 5000 KSST Sulphur Sprgs., Tex. 10170 WGVA Geneva, N.Y. 500d I000d K FTV Parts, Tex. 500d WSPR Springfield. Mass. 5000 I(WTX Waco. Tex. I000d WITN Jamestown. N.Y. 500 KMOR Murray. 250 KPAC Port Arthur, Tex. 5000 WXYZ Detroit. M1tieh. 5000 Utah WVOS Liberty, N.Y., 1000 KU 1(A KOAL Price, Utah 1000 San Antonio, Tex. 11000d I(WEB Rochester. Minn. 5000 WNBZ Saranac Lake, N.Y. 1000 KTFO WVOh1 loka, Miss. WJOY Burlington, Vt. 1000 WSNY Seminole. Tex. 1000. 1000d Schenectady, N.Y. I000d KANN Ogden, Utah W LSMI Louisville, Miss. 5000d WBBI Abingdon, Va, I000d WATN Watertown, N. Y. 1000 I000d WODI Brookneal, KVEL Vernal, Utah 5000d I(USN St. Joseph, Mo. I000d Va. 1000 WPNF Brevard, N.C. 1000 WDVA I(BUS Sparks, Nev. WCFV Clifton Forge, Va. 1000 WIST Danville, Va. 5000 I000d Charlotte, N.C. 1000 WYSR Va, WTSN Dover. N.H. 5000 WFVA Fredericksburg, Va. 1000 WCNC Elizabeth Franklin, I000d City, N.C. I000d WEER Warrenton, Va. I000d WDVL Vineland, N.J. SOOd WNW] Norfolk. Va. 1000 WJNC Jacksonville, N.C. 1000 K W YZ Everett. Wash. 1000 I(WSC Pullman. Wash. 5000 KINN Alamogordo, N.M. 1000d WRNC Raleigh, N.C. 1000 KTW KSPO Spokane. Wash. 1000 Seattle, wash. 5000 WHLO Niagara Falls, N.Y. 5000d KDLR Devils Lake, N.Dak. 250 WEMP Milwaukee, Wis. 5000 WOLA Walton, N.Y. 1000d KREW Sunnyside. Wash. 1000 WBBW Youngstown, WLOG Logan, W.Va. 1000 Ohio 1000 WCGC Belmont, N. C. 1000 WHIZ Zanesville, Ohio 1000 1260-238.0 W5IPM Smithfield, N.C. 5000d WTAP Parkersburg. W.Va. 1000 KVSO Ardmore. W H BY Appleton, Wis. 1000 Okla. 250 1(PIN I(BOM Mandan. N.Dak. 1000 KBE I< Elk City, Okla. 250 Casa Grande. Ariz. I000d WCLO Janesville. Wis. 1000 KCCB WILE Cambridge. Ohio 1000d (BEL Idabel. Okla. Corning, Ark. I000d K W WXCO Wau au, Wis. I000d 250 KBHC Nashville, Ark. PR Claremore, Okla. 500d KVOC KOKL Okmulgee, Okla. 1000 500d KAJO Grants Pass Oreg. 5000d Casper, Wyo. 1000 KFLY Corvallis, I(GIL San Fernando, Calif. 5000 Oreg. I000d KYA WLBR Lebanon. Pa. 5000 KTIX Pendleton, Oreg. 000 San Francisco, Calif. 5000 1240-241.8 KSNO Aspen. WBHC Hampton. S.C. 1000d KPRB Redmond. Oreg. 250 Colo. 5000d KNWC Sioux Falls, S.Dak. 1000 WEBJ Brewton. Ala. 250 KOEN Roseburg. Ore. WCRT Birmingham, Ala, 5000d 000 1V ht MM W Ll1( Newport. Tenn. 5000d WPRN Butler. Ala. 1000 WRTA Altoona. Pa. 000 Westport. Conn. I000d WNRK Newark, Del, KIOX Bay City. Tex. 1000 WULA Eufaula, Ala. 250 WHUM Reading, Pa. 000 500d I(HEM Big Spring, Tex. I000d WOWL Florence. Ala. 1000 WSEW Selinsgrove. Pa. WWDC Washington. D.C. 5000 WFTW Fort KEPS Eagle Pass Tex. I000d WARF Jasper, Ala. 1000 WBAX Wilkes-Barre, Pa. 000 Walton Beach. It FJZ Fort KVRD Cottonwood. 250 Worth, Tex. 5000 Ariz. WALO Humacao, P.R. 000 Florida 1000d WTID Newport News. Va. I000d KZOW So. of Globe. Ariz. 1000 WAME Miami, Fla. WWON Woonsocket. R.I. 000 5000 W H EO Stuart, Va. I000d KVRC Arkadelphia. Ark. 250 WWPF Palatka, Fla, W KOK Newberry, S.C. 000 1000 KCVL Wash. 1000d KILO Mountain Home. Ark. 1000 WHAB Baxley, Ga. Colville. WDXY Sumter, S. C. 000 5000d KBAM Longview, Wash. 5000d (WA 1< Stuttgart, Ark. 250 WBBK Blakely, Ga. 1000d KCCR Pierre, S. D. 000 W RIC Mauston, Wis. 500d KPLY Crescent City. Calif. 250 WBEJ Elizabethton, Tenn. 000 WTJH East Point, Ga. 5000d KOAD KTEE Idaho WWJC Superior, Wis. 5000d Lemoore. Cal. 250 WEKR Fayetteville. Tenn. 000 Falls. Ida. 5000d KI ML KMBY Monterey, Calif. 1000 KWEI Weiser, Ida. 1000d Gillette. Wyo, 5000 WBIR Knoxville, Tenn. 000 WIBV KPPC Pasadena. Calif. 100 Wit DA Nashville, Tenn. 000 Belleville. Ill, 5000d 1280-234.2 KLOA Ridgecrest, Calif. 250 WFBM Indianapolis, Ind. W EN K Union City. Tenn. 000 5000 WPID I(ROY Sacramento, Calif. 1000 KVLF Alpine, Tea. 000 KFGQ Boone, Iowa 1000d Piedmont. Ala. 1000d K K W WNPT Tuscaloosa, RNO San Bernardino. ' I

114 RADIO -TV EXPERIMENTER W.P. kHz Wave Length W.P. kHz Wave Length kHz Wave Length W.P. kHz Wave Length W.P. Ridge, Ark. 1000d KCFA Spokane, Wash. 50000 Ohio 1000 W IBR Baton Rouge, La, 10 00 ' KRLW Walnut Martinsville, WONW Defiance, 00 KHSJ Hemet, Calif. 500d WETZ New Ohio I000d WFBR Baltimore. Md. 50 W , V a. 1000d WLMJ Jackson, 100 Od KLAN Lemoore, Calif. 1000d I000d WJDA Quincy, Mass. Sheboygan, Wls. 50110 KLCO Poteau, Okla. 50 00 NUDE Oceanside, Calif. 500 Eugene. Oree. 5000 1WOOD Grand Rapids, Mich. KOVE Lander. Wyo. 5000 KERG Princeton, Minn. KCRA Sacramento. Calif. 5000 WBRX Berwick. P. 1000d W KPM 1000d W RBC Jackson, Miss. 50 00 l(AVI Rocky Ford, Colo. WHVR Hanover, Pa. 5000 Conn. 5000 1240-223.7 Pa. 1000 KM MO Marshall, Ma. 100 Od WATR Waterbury, WKST New Castle, 500 Od WGMA Hollywood, Fla. 5000 1000 WCMN Arecibo, P.R. 5000 KBRL McCook, Nehr W KUL Cullman, Ala. KPTL Carson City, Nev. 50 00 WZO K Jacksonville, Fla. 5000 WIDI Florence, Ala. 1000 ;WANS Anderson, S.C. 5000 Fla. 500d 5000d WPNH Plymouth, N.H. 100 Od WAh1R Venice, WGWC Selma, Ala. 250 WJAY Mullins. S.C. WHIE Griffin, Ga, 5000d 1000 WMCP Columbia. Tenn. IOOOd WAAT Trenton, N.J. 500 Od W FEB Sylacauga Ala. 100 Od W KAN Kankakee, III, 1000 1000 WONT Dayton. Tenn, IOOOd WOSC Fulton. N.Y. K 11<0 Miami, Ariz. 100 Od KNIA Knoxville, Iowa 500d Ariz. 250 KNIT Abilene, Tex. 500d WM MA Lancaster, N.Y, KFBR Nogales, N.Y. 500 Od KMAQ Maquoketa, Iowa 500d Prescott. Ariz. 1000 K W H I Brenham, Tex. I000d WEEE Rensselaer, KENT N.Y. 50 Od KLWN Lawrence, Kans, 500d KOTA Batesville, Ark. 1000 KLUE Longview, Tea. 1000d WRRC Spring Valley, I000d Goldsboro, N.C. 100 Od WBRT Bardstown, Ky, KZNG Hot Springs. Ark. 250 KRAN Morton, Tex. 500 WGOL Ky. 500d 1000 500d WLNC Laurinburg, N.C. 00 WCLU Covington, KBRS Springdale, Ark. KV W G Pearsall, Tex. Mayfield, Ky. I000d 1000. 5000 WSYD Mt. Airy, N.C. 5000 WNGO KATA Arcata, Cal. KAIAK Salt Lake City. Utah KHAL Homer, La. 1000d Cal. 250 WYVE Wytheville, Va. 1000d WERE Cleveland, Ohio 5000 K W XY Cathedral City. Mt. Vernon, Ohio 500 WICO Salisbury, htd. 1000d KMAI( Fresno. Calif 1000 KMAS Shelton, Wash. Ihood WMVO 1000 N Okla. 5000 WARA Attleboro, Mass. K DOL Mojave, Cal. 500 K UDY Spokane. Wash. 5000d OME Tulsa, KDOV Medford, Oreg. 5000d WILS Lansing, Mich. 5000 KSFE Needles, Calif. 250 KIT Yakima. Wash. 5000 Marquette, Mich. 1000 1000 W.Va. 1000d KAC1 The Dalles, Oreg. I000d WD111J KAOR Oroville, Cat. WVAR Richwood, 500d WRJW Picayune, Miss. 5000d Luis Obispo, WNAM Neenah, Wis. 5000 W WCH Clarion, Pa. KATY San WTHT Hazleton, Pa. I000d KXLW Clayton, Mo. I000d California 1000 1290-232.4 WTIL Mayaguez. P.R. 1000 KOLT Scottsbluff. Nebr, 5000 K1ST Santa Barbara, Calif. 1000 WLOW Aiken, S.C. 500d KROO Roswell, N.M. I000d KOAIY Watsonville. Calif. 1000 WHO() Jackson. Ala. 1000d 1000d W W HG Hornell. N.Y. 5000d 1000 Ala. I000d WDOG Allendale, S.C. KDEN Denver. Colo. WSHF Sheffield, WCKI Greer. S.C. I000d WAGY Forest City. N.C. 1000 KWSL Grand Junction, Colo. 250 W M LS Sylacauga. Ala. I000d 500d WCOG N.C. 5000 1000 1000 WKSC Kershaw, S.C. Greensboro, K VRH Salida. Cole. KCUB Tucson, Ariz, 1000d W 1

W H W H Princeton, N.J. 5000 W F D R Manchester, Ga. I000d KMUL Muleshoe, Tex. 1000d I(ABQ Albuquerque, N.M. 5000 WLOV Washington. Ga. 1000d I(BOP Pleasanton. Tex. 1000d G°311_110 WCBA Corning. N.Y. 10000 WPRC Lincoln, Ill. 1000d WSYR Rutland. Vt. 5000 WRNY Rome, N.Y. SOOd WITS Bloomington, Ind. 5000 WTVR Richmond, Va. 5000 WBMS Black Mountain, N. C. WLTH Gary, Ind. I000d KR I<0 Everett, Wash. 5000 500d KDTH Dubuque. Iowa 5000 I(PEG Spokane, wash. 5000d WHIP Mooresville. N.C. IOOOd 1

116 RADIO -TV EXPERIMENTER Length W.P. kHz Wave Length W.P. kHz Wave Length W.P. kHz Wave Length W.P. kHz Wave 5000 WRON Roneeverte. W.Va. 1000 WQBC Vicksburg, Miss. 1000 RCN E Cherokee, Iowa KIGO St. Anthony, Ida. 500d KEWI Topeka, Kane. 5000 KSPT Sandpoint, Idaho 1000 WVRC Spencer W.Va. 1000 KBTN Neosho, Mo. 250 1(000 Omaha, Nebr. 10004 WCOS Glasgow, Ky. 10000 W D W S Champaign. Ill. 1000 WKWK Wheeling. W.Va. 1000 KSYX Santa Rosa, N.Mex. 1000d WPDE Paris, Ky. 10000 1 000 WBTH Willla mson, W.Va. WGIL Galesburg. Ill. 10000 WED Williamsburg, Ky. 1000d Evansville Ind. I 000 WATW Ashland, Wis. 1000 WALT Herkimer. N.Y. WROZ Newark. 500 (NIB Monroe, La. 5000 1 Claire, Wis. 1000 WACK N.Y. WBAT Marion, Ind. 000 WBIZ Eau Westbrook. Me. 50000 500 WDUZ Green Bay, Wis. 1000 WLNA Peekskill, N.Y. 10004 WJAB KCOG Centerville, la 500 WAAB Worcester, Mass. 5000 KVFO Fort Dodge. Iowa 10 00 W RJ N Racine. Wis. 1000 WMYN Mayodan. N.C. 1000 N.C. 50000 WBCM Bay City, Mich. 1000 KVOE Emporia. Kans. 10 00 WROB Reedsburg, Wis, WGAS S. Gastonia. Wausau. Wis. I0000 WVOT Wilson. N.C. 1000 WDOW Dowaglac, Mich. 1000d KAYS Hays. Kans. 10 00 WRIG Inkster, Minh. 1000 2 50 KATI Casper. Wyo. 1000 W H K Cleveland. Ohio 5000 WCHB WCYN Cynthiana, Ky. 10000 KQRS Golden Valley, Mlnn. 5000d Ky. 10 00 (001 Cody. Wyo. 1000 KYNG Coos Bay, Oreg. WIEL Elizabethtown, Pa. 5000 KEYL Long Prairie, Minn. 1000 WFTG London. Ky. 2 50 WCOJ Coatesville, WCED DuBois, Pa. 5000 WHHT Lucedale, Miss. I000d WFPR Hammond, La. 10 00 1410-212.6 WSEL Pontotoc, Miss, 10000 10 5000 WEUC P.nce, P.R. 1000 R AOit Lake Charles, La. 00 WUNI Mobile, Alp. N.J. 10000 100 Od SOOd WCRE Cheraw, S.C. 1000d WMVB Millville, 00¡{00 Augusta. Maine WRCK Tuscumbia, Ala, 10000 10 00 1000 WEMB Erwin, Tenn. 5000d WBAB Babylon, N.Y. WIDE Biddeford. Main* KTCS Fort Smith. Ark. F 1000d 1000 1000 W KSR Pulaski, Tenn. 1000 W11L Niagara ills, N.Y. WWIN Baltimore, Md. KERN Bakersfield Calif. 10000 10 00 5000 KFYN Bonham, Tea. 250d WSGO Oswego, N.Y. WALE Fall Riser, Mass. KRML Carmel, Calif. N.C. 10000 10 00 5000 KLFB Lubbock, Tex. W BLA Elizabethtown, WLLH Lowell, Mass. (KOK Lompoc. Calif. 5000 Mass. 10 00 5000 KTRE Lufkin, Tex. 1000 WBUY Lexington, N.C. WHMP Northampton, KMYC Marysville, Calif. Grand N.D. 1000 Creek, Minh. 1000 KCAL Redlands. Cal. 5000 KGNB New Braunfels, Tex. I000d KILO Forte, WKFR Battle Angela. Tex. 1000d WHHH Warren. Ohio 5000 WJLB Detroit. Mich. 10 000 (COL Ft. Collins, Colo. 1000 KPEP San Albans. Vt. 10000 KMED Medford, Oreg. 5000 WHDF Hoa hton, Mich. 2 50 WPOP Hartford, Conn. 5000 W W SR St. 5000 WDOY Gloucester. Va, 1000d (001 The Dalles. Oreg. 1000 WGON Munising. Mich. I 000 WDOV Dover, Del. Pa. 5000d 10 WMYR Fart Myers. Fla, 5000 W KCW Warrenton. Va. 5000d WCDL Carbondale. WSAM Saginaw, Mich. 00 WNPV Lansdale, Pa. 500d Mich. 10 00 WZST Leesburg, Fla. 10000 K Ill ChehallsCentraila, WSiM St. Joseph. WGCB Red Lion, Pa. 1000d I 000 WONS Tallahassee. Fla. 50000 Wash, I000d WTCM Traverse City, Mith. S.C. 5000 10 00 WGRI Griffin, Ga. 10000 (RON Renton, Wash. 500d WOOK Greenville. KEYL Long Prairie, Minn. Cowan, Tenn. 10000 10 00 WSNE Cummings, Ga. 1000d KUl Walla Walla. Wash. 5000 WZYX KMHL Marshall, Minn. ale Kenzie, Tenn. 500d I 000 WDAX McRae, Ga. IOOOd WPLY Plymouth. WIs. 500d WHOM WMIN Mpls.St. Paul, Minn. Tex. 5000 10 00 WLAQ Rome. Ga. 1000 KPUR Amarillo, WHLB Virginia, Minn. TeX. 1000 10 00 WRMN Elgin, 111. 10000 KEYS Corpus Chrlatl, WBIP Booneville, Miss. 1430-209.7 KDNT Denton, Tex. 5000 Miss. 10 00 WTI M Taylorville, Ill. 1000d WNAG Grenada, W FH K Pell City, Ala. 10000 Greenville, Tex. 1000 Miss. 10 00 WAIT Lafayette, Ind. I000d KGVL WFOR Hattiesburg, KHBSI Monticello, Ark. 10000 K W E Midland, Tex. 5000d 10 00 KGRN Grinnell, l,wa 500d L WiQS Jackson, Miss. KAMP El Centro, Calif. I000d TeX. 50000 10 00 KLEM Leafars, Iowa 10000 KETX Livingston, WMBC Macon, Miss. Fresno. SOSO W Blackstone. Va. 50000 10 KCLO Leavenworth. Kans. 5000d (ARM Calif. KLV KFRU Columbia, Mo. 00 Cal. 5000 1000 K W Wichita, (ans. 5000 KALI San Gabriel, WHRN Herndon, Va. KJCF Festus, Mo. 10 00 BB Sacramento, Calif. 500d 5000d 00 Green. Ky. 5000 (JAY KONC Spokane, Wash. (SIM Sikeston. Mo. 10 WLBJ Bowling KGNU Santa Clara. Cal. 1000 5000 10 00 WHLN Harlan, Ky. 50000 WHIS Bluefield, W.Va. KITS Springfield, Mo. KOSI Aurora, Colo. 5000 WAJR Morgantown, W.Va, 5000 KONG Deer Lodge. Mont. 2 50 KDBS Alexandria. La. I000d Md. I000d WIII Haenestead, Fla. 5000 WNFL Green Bay, Wis, 5000 KXGN Glendive. Mont. 2 50 WHAG Halfway, Lakeland. Fla. 5000 10 WOKW Brockton, Naas. 1000d WLAK KARR Great Falls, Mont. 00 WPCF Panama City, Fla. 5000 10 00 WGRD Grand Rap., Mich. I000d 1450-206.8 KCOW Alliance, Nebr. WGFS Covington. Ga. 10000 10 00 KLFD Minn. 500d WDNG Anniston. Ala. 1000 KLIN Lincoln, Neb. Litchfield, Dalton. Ga. 11000d 50 Roseau, Minn. 1000 W RCD Bessemer, Ala, 1000 KBMI Henderson. Nev. 2 KRWB Ga. 5000 WYAM 10 1000d WWGS Tifton, Ala. 1000 KWNA Winnemucca, Nev. 00 WDSK Cleveland. Miss. Park. III. 10000 WD1G Dothan. 2 50 WBKN Newton. N iss. 500d WEEF Highland Ala. I000d WBRL Berlin. N.H. Ottawa. III. 500d WFIX Huntsville, 10 North Platte. Neb. .1000 WCMY WTSL Hanover, N.H. 00 WNOP Iadianapolls, Ind. 5000 WLAY Muscle Shoals Gib. 2 50 WHTG Asbury Pa WIRE Alabama 1000 WLTN Littleton, N.H. k Ames, Iowa 1000d 1000 Eatontown. N.J. 50Od KASI KLAM Cordova, Alaska 250 KTRC Santa Fe. N.M. KMRC Morgan City. La. 500d KCHS Truth or Consequences. WDOE Dunkirk. N.Y. 10 00 KA W T Douglas, Ariz. 250 Elmira. N.Y. 10 00 WNAY Annapolis, ofd. 5000 1000 New Mexico 250 WELM 5000d KNOT Prescott, Ariz. WBZA Glens Faits, N. Y. 100 Od WTTT Amherst. Klass. KOLD Ariz. 250 KTNM Tucumearl. N.M. 1000 Medford. Mass. 50004 Tucson. WOND Pleasantville, N.J. 1000 WOTT Watertown, N.Y. 5000 WHIL K ENA Mena. Ark. 250 WABY Albany. N.Y. 1000 WVCB Shallotte, N.C. 50 Od WION Ionia, mien. 5000d KJWH Camden, Ark. I000d 1000 WEGO Concord, N.C. 100 Od WBRB 1.11. Clemens, Mich. SOOd KYOR Blythe. Cat. 1000 WYSL Buffalo, N.Y. Miss. 50004 WSLB Ogdensburg. N.Y. 1000 WSRC Durham. N.C. 100 Od WLAU Laurel, KAVA Burney, Cal. WBMA Beaufort, N.C. 250 WING Dayton. Ohio 5000 KAOL Carrollton, Mo. SOOd KOWN Escondido. Calif. 250 1000 KPAM Portland. Oreg. 5000d WIL St. Louis, Mo. 5000 Palm Cal. 1000 WGBG Greensboro. N.C. 5000 KPAL Springs, WSHB Raeford, N.C. 1000 WLSH Lansford, Pa. S000d KRGI Grand Island. Nebr. KTIP Porterville, Calif. 1000 1000 (QV Pittsburgh. Pa. 5000 WNJR Newark. N.J. 5000 KSOL San Francisco, Cal. 1000 WSIC Statesville. N.C. 50000 WLSE Wallace. N. C. 1000 WPCC Clinton. &C. I000d (CFI- F.osweli. N.M. KVML Sonora. Calif. 1000 N.C. 1000 WYMB Manning. S.C. 1000d WENE Endicott. N.Y. 5000 KVEN Ventura. Calif. 1000 WHCC Waynesville, N.C. 5000 WSMY Weldon. N.C. 10000 WCMT Martin, Tenn. I000d WMNC Morganton. KZIN Yuba City, Calif. 100 1000 KBUD Athens, TeL 1000d W OJS Mt. Olive, N.C. IOOOd KGIW Alamosa, Cole. 1000 KEYJ Jamestown, N.Dak. 10000 WMAN Mansfield, Ohio I000d KBAN Bowie. Tex. 5000 W RXO Roxboro. N.C. KYOU Greeley, Colo. 1000 1000 TeL 500 WFOB Fostoria, Ohlo 1000 WNAB Bridgeport, Conn. 1000 WPAY Portsmouth, Ohlo KVLB Cleveland. 500d KWON Bartlesville. Okla. 1000 KXIT Dalhart. Tax. 500d WCLT Newark, Ohio WILM Wilmington, Del. 1000 250 KDOX Marshall, Tex. 500 KALV Alva, Okla. 500 WOL Washington. D. C. 1000 KTMC McAlester, Okla. 5000 KNOR Norman, Okla. 250 (RIG Odessa. Tex. 1000 KELI Tulsa. Okla. WWJB Brooksville. Fla. 250 KNND Cottage Grove, Oreg. I000d KBAL San Saba, Tex. 500d KGAY Salem, Oreg. 5000d W M Fl Daytona Beach, Fla. 1000 KAY John Day. Ore. 1000 KNAL Victoria, Tex. 500 WVAM Altoona, Pa. 5000 WOCN Miami, Fla, 250 WEST Easton, Pa. 1000 WIK1 Chester. Va. 5000d WNEL Caguas, P. R. 5000 WBSR Pensacola. Fla, 1000 WJET Erie, Pa. 1000 WRIS Roanoke. Va. S000d WBLR Batesburg, S.C. 5000d WSPB Sarasota. Fla. 1000 WFEC Harrisburg. Pa. I000d WROS S. Charleston. W.Va. I000d WATP Marion, S.C. I000d WSTU Stuart. Fla. 250 I000d W W SF Loretto, Pa. 250 WKBH LaCrosse, Wis. 5000 WBUG Ridgeland, S.C. WTAL Tallahassee, Fla. 1000 WICK Scranton, Pa. 250 KWYO Sheridan. Wyo. 1000 KBRK Brookings, S. Oak. 10000 WGPC Albany, Ga. 1000 WRAK Williamsport, Pa. 1000 W GY W Fountain City, Tenn. 1000d WBHF Cartersville, Ga, 1000 WVOZ Carolina. P. R. 500 1420-211.1 WENO Madison. Tenn. 5000 WCON Cornelia, Ga. 250 WCOS Columbia. S.C. 1000 WHER Memphis, Tenn. 1000 WKEU Griffin, Ga. 1000 5000d IOOOd Georgetown. S.C. 1000 WACT Tuscaloosa, Ala. KSTB Breckenridge. Tex. W M V G Ga. 1000 WGTN Ariz. 1000 Milledgeville, W HCQ Spartanburg. S.C. I000d KHFH Sierra Vista, KEES Gtadewater, Tex. 10000 WBYG Savannah, Ga. 1000 WBJM Lemmon, S.O. 1000 KXOW Hot Sprloks, Ark. KCOH Atlastan, Tex. 10004 W VLD Valdosta, Ga. 1000 Tenn. 1000 KPOC Pocahontas, Ark, I000d KLO Ogden, Utah 5000 KVSI Montpelier, Ida. 1000 WJZM Clarksville, 1000 W HUB Cookeville, Tenn. 1000 KRDO Colo. Sprys., Colo. WIVE Ashland, Va. I000d KEEP Twin Falls. Idaho 1000 WLSB Copperhill, Tenn. 1000 KJST Joshua Tree, Cal. 10000 W OIC Clineho, Va, (0000 WVON Cicero. III. 1000 WGAP Maryville, Tenn. 1000d KSTN Stockton, Calif. 5000 (BBC hit. Vernon, Wash. 5000 500 500d WKEI Kewanee. III. W H A Shelbyville, Tenn. 1000 WL1S Old Saybreok. Conn, WEIR Weirton, W.Va. 1000 1000 L 1000 WCVS Springfield, Ill. KRUN Ballinger. Tea. 1000 WBRD Bradenton, Fla. WBEV Beaver Dam, Wis. 10000 WLYV Ft. Wayne. Ind. 500 KBYG Big Springs, Tax. 1000 WDBF Delray Beach. Fla. 5000d WXVW Jeffersonville. Ind. 1000 KUNO Carpus Christi, Tex, 1000 WETH St. Augustine, Fla. 10000 1440-208.2 WASK Lafayette. Ind. 1000 KILE nr. Galveston, Tex. 250 WAVO Avondale Estates, Ga. I000d WAOV Ind. 1000 5000 WHHY Montgomery, Ala. 5000 Vincennes, KGVL Greenville. Tex. 1000 WRBL Columbus. Ga, Ariz. 50000 KLWW Cedar Rapids. la. 25C WPEH Louisville, Ga. I000á KDOT Scottsdale. KEBE Jacksonville, Tex, 1000 (HOG Fayetteville. Ark. 10000 K YET Payette. Ida. 250 KIUN Pecos, Tex. 1000 WLET Toccoa. Ga. 5000d Kans, 1000 5000 KOKY Little Rock, Ark. S00od KWBW Hutchinson. KEYE Perryton, Tex. 250 KCCN Honolulu, Hawaii 5000 WTCO Campbellsville Ky. 1000 W III. 500d KVON Napa. Cal. KVOP Plainview, Tex. 1000 INI Murphysbcro, 1000 WWXL Manchester. icy. 1000 1000 WINS Michigan City, Ind. 5000d KPRO Riverside. Calif. NOWT Stamford, Tea. KCOY Santa Maria, Calif, 1000 WPAD Paducah, Ky. 1000 KTEM Temple, Tex. 1000 WOC Davenport. Iowa 5000 W DIS Bristol, Conn. 5000 WLKS W. Liberty, Ky. 1000 KTFS Texarkana. TeL 250 KICK Junetion City, Kans. I000d 1000 W LEH Lehigh Acres, Fla. KSIG Crawley, La. KVOU Uvalde. Tex. 250 KULY Ulysses. Kans. 10000 La. 1000 5000d WABR Winter Park, Fla. 500C KNOC Natchitoches, KIXX Provo, Utah 250 WTCR Ashland, Ky. WNP$ New Orleans, La. 250 Burlington, Vt 1000 WHEN Harrodsburg, Ky. 10000 W W CC Bremen, Ga. 1000d WDOT WGIG Brunswick, Ga. 5000 WLKN Lincoln. Me. 1000d WHHV Hillsville. Va. 1000 SUN/1S Owensboro, Ky. 5000 Maine 250 1000 WVMG Cochran, Ga. WRKD Rockland. WHIR Portsmouth. Va. 1000 KPEL Lafayette La. 5000 WKTQ South Paris, Maine 1000 1000 New Mass. 5000 W RAJ Anna, III. WHLF So. Boston, Va. WBSM Bedford, 1000 Cumberland. Md. 1000 1000 Pilts0eld, Mass. 1000 WIOK Normal, III. WTBO WINO Winchester. Va. WBEC Paris, III. I000d WTHU Thurmont. Ml. KEDO Longview, Wash. 1000 WAN Flint, Mich. 1000d WPRS WGEM Quincy, III. 5000 WMAS Springfield, Mass. 1000 KRSC Othello, Wash. 250 WKPR Kalamazoo. Mich, I000d Alpena Township, Mankato. Minn. 5000 WROK Rockford, III. 5000 WATZ KTNT Tacoma. Wash. 1000 KTOE 500d Michigan 1000 WBOY Clarkesburg, W.Va. 1000 WSUH Oxford. Miss. 100oá WPGW Portland. Ind. 117 FEBRUARY -MARCH, 1968 WIIHtTE'S kHz Wave Length W.P. kHz Wave Length W.P. kHz Wave Length W.P. I(B IC W Aberdeen. Wash. 1000 I

FEBRUARY -MARCH, 1968 119 kHz Wove Length W.P. kHz Wave Length W.P. kHz Wove Length W.P. KIRT Mission. Tex. I000d WVOE Chadburn, 1

Are your home -town AM stations listed correctly in White's Radio Log? If you believe there is a correction listings, please check first with your local station. For each callsign obtain the correct city location, to White's station, frequency, and power. (Remember, even though your local paper may list a station as a "home -town" all the facts on a piece of paper it may he officially licensed by the FCC for operation in the next city.) Get very brief), include your name and address, and mail to White's Radio Log, RADIO -TV EXPERIMENTER, (he of White's 505 Park Ave., New Yolk, N. Y. 10022. Your help in contributing to the accuracy and completeness Radio Log will he sincerely appreciated. -Editor 121 FEBRUARY -MARCH. 1968 U. S. Television Stations by U. S. stations States listed alphabetically by cities within state groups. 1. Territories and possessions follow states. educational stations. Listing indicates stations Chan., channel: C.L., tall letters. on the air on October 1. 1967 WHITE'S Location C.L. Chan. Location C.L. Chan. Location C.L. Chan. Sacramento KCRATV 3 KXTV 6WETV 30 Waterloo. 10 WBMO.TV 96 CD iKVIE 6 Cedar Rapids KW WL-TV 7 Mal Salinas - WJRJ-TV 17 Augusta WJBF 6 Monterey KSBWTV 8 KANSAS San WRDW-TV 12 Bernardino jKVCRTV 24 Chatsworth Ensign KITR 30 tWCLP-TV 18 KTVC 6 ao@ San Columbus WRBL-TV 3 Garden City Diego KGLD II tKEBSTV 15 WTVM KFhIBTV 8 9 KUPK-TV 19 tWJSPTV 28 Goodland KLOE-TV 10 Location K0G0TV 10 Dawson f W ACS.TV Great Bend C.L. Chan. KAAR 39 25 KCKT 2 Macon WMAITV 13 Hays San Diego -Tijuana XETV 6 KAYS-TV 7 Pelham fWABWTV 14 HutehinsonWiebita KTVH XEWTTV 12 Savannah 12 ALABAMA San Francisco WSAVTV 3 Pittsburg - KRONTV 4 WTOC.TV Joplin, Mo. Birmingham WBRC-TV 6 KPIX 5 II KOAMTV 7 fWVANTV 9 Salina KSLN-TV WAPITV 13 I(GO.TV 7 34 Waycross 8 Topeka WBMG 42 tKOED 9 Wrens 9WXGA-TV WIBWTV 13 20 Wichita 10 KSANTV 32 IWCESTV KARD-TV 3 Decatur tWBIQ San W MSL.TV 23 lose KNTV 11 KAKETV 10 San Dothan WTVY 4 Luis iKTEH 54 HAWAII Dozier Obispo KENTUCKY tWDIQ 2 KSBY.TV 6 Hilo KPUA-TV 9 Florence 36 San Mateo Bowling 1WFIQ fKCSMTV 14 KHAWTV II Green WLTV 13 15 Santa Barbara WOWL-TV 3 KHVO 13 Lexington WLEX.TV 18 Huntsville 19 Santa Maria WHNT-TV KCOYTV 12 Honolulu t(HON-TV 2 WKYT-TV 27 25 Stockton -Sacramento I

FEBRUARY -MARCH. 1968 123 WHITE'S Location C.L. Chan. Location C.L. Chan. Location C.L. Chan. Paseo KEPR-TV 19 Oak Hill WOAY-TV 4 Pullman tKWSC-TV 10 Parkersburg - WYOMING Richland KNDU 25 12,C D00 Marietta. O. WTAP-TV 15 Casper KTWO.TV 2 Seattle KOMO-TV 4 Weston WDTV 5 Cheyenne KFBC.TV 5 KING -TV 5 Wheeling Riverton KWRBTV 10 KIRO-TV 7 Steubenville. 0 WTRF-TV 7 +KCTS-TV 9 GUAM 105 Spokane KREMTV 2 WISCONSIN Agana KXLY-TV 4 KUAMTV 8 Eau W KHQTV 6 Claire EAUTV 13 Location C.L. Chan. Green PUERTO RICO tKSPSTV 7 Bay WBAY-TV 2 Tacoma -Seattle WFRV-TV 5 Aguadilla WOLE.TV 12 Norfolk WTAR-TV 3 KTNT-TV II Petersburg. Tacoma KTVW 13 WLU K -TV 11 Caguas WKBMTV 11 LaCrosse W KBT 8 Mayaguez WORATV 5 Richmond WXEXTV 8 tKPECTV 56 Portsmouth Madison WISCTV 3 tWIPMTV 3 !i W YAH-TV 27 1KTPS 62 Ponce PortsmouthNertolk Yakima KNDO WMTV 15 WRIKTV 7 WAVYTV II) 23 WSUR.TV 9 Richmond WTVRTV 8 KIMATV 29 W KOW TV 27 1W HA -TV Si WP81 14 WRVATV 12 iKYVETV 47 San loan W KAQTV 2 23 Milwaukee WTMJ.TV 4 IWCVE-TV WAPA-TV 4 1WCVW 57 WITI-TV 6 Roanoke WEST VIRGINIA tW IPR-TV 6 TV/BRA-TV 15 W1SNTV 12 WITA 30 WOBJTV 7 Bluefield WHIS-TV 6 WVTV 18 t0 W TSJ 18 WSLSTV Charleston WCHS-TV 8 tWMVS 10 W1TATV 30 WRIT -TV 27 Clarksburg WBOY-TV 12 tWMVT 36 WASHINGTON Huntington Rhinelander WAEO.TV 12 VIRGIN ISLANDS Charleston 3 WSAZ-TV Wausau WSAU-TV 7 Charlotte Amalie 10 Bellingham KVOS-TV 12 WBNBTV WHTN-TV 13 WAOW-TV 9 Christiansted WSVI 8

.onuummMIm.u..mmu111.n,11111..mm.a111mmw.1.11.11.,111:.111w,.1u.uw1uv0u11ww®1ovmm,mmuvuwmo®uwwIZIMunwmemuiuuu.m1m1,. 111 11,1nwmv.1t111,n111wr,ww.wuvww.1..u0ww. Canadian Television Stations by Cities Canadian stations listed alphabetically by cities. Abbreviations; Chan., channel; C.I. call letters. Location C.L. Chan. Location C.L. Chan, Location C.L. Chan. Location C.L. Chan. Adams Hill, B.C. CFCR-TV.8 II Courtenay, B.C. CBUTI 9 London, Ont. CFPL-TV 10 Passmore, B.C. CH MS-TV2 Altleane. Sask. CKBI-TV-I 10 Colgate, Saskatchewan 2 Lookout Ridge, Near Peace River, Alta. CBXAT-1 7 Amherst, N.S. CJCHTV-3 8 CKCK-TV1 12 Chilliwatk. B.C. CBUT-2 3 Peachland, B.C. CHPT-TV-1 S Antigonish, N.S. CJCB-TV2 9 Cranbrook, B.C. CBUBT 10 Lumby, B.C. CHID-TV1 5 Pembroke, Ont. CHOV-TV 5 Argentia. Nod. CJOX-TV 3 Crescent Valley, B.C. Mabel Ashcroft. Lake. B.C. CHPPTVI 8 Penticton. B.C. CHBCTVI 13 B.C. CFCRTV2 10 CHMS-TV-1 5 Magdalen Que. Ashmont. Islands, Peace, Que. CHAUTV-5 2 Alta. CFRN-TV-4 12 Dawson Creek. B.C. CJDCTV 5 CBFCT-1 12 Perrys, B.C. CHMS-TV3 5 Athabasca. Alta. CBXT-I 8 Deer Lake. Nod. 12 CBYAT Malakwa. B.C. CFFI-TV1 5 Peterborough, Ont. 12 Atlkokan, Ont. CBWCT-1 7 Drumheller, Alta. CHEX-TV CFCN-TVI 12 Malartie. Que. CFCL-TV5 5 Pivot. Alta. -I 4 Ayala. B.C. CFCRTV-13 3 CHAT -TV Drumheller, Alta. CHCT-TV1 8 Manlcouagan, Que.CKHQ-TV-I 10 Placentia, Baldy Mountain. Man. Dryden. Ontario Nfld. CBNT-2 12 CBWAT-I 9 Marquis, Sask. CKMITV 7 Port Albernie, B.C. 4 CKSS-TV 8 Eastend. CBUT3 Sask. CJFB-TVI 2 Marystown, Nfld. CENT -3 5 Alfred. Bale St. Paul. Que. Edmonton, Alta. Port Que. CKRS-TV-1 9 CBXT 5 Matagaml. Que. CKRNTV-4 7 Port Alice, B.C. CKPATV-I 2 CKRTTV-I 2 Edmonton, Alta. CFRN-TV 3 Matane, Que. Bancroft, CKBL-TV 9 Port Arthur, Ont. CKPRTV 2 Ont. CHEXTV1 2 Edmundston, N.B. CJBR-TV-1 13 Meadow Banff. Alta. Lake Sask. Port Daniel, Que. CHAU -TV -3 10 CKRDTV-2 10 Elliot Lake, Ont. CKS01V-1 3 CKSA-TV-I 12 Port Hardy. B.C. CFKB-TV-3 3 CFCN-TV-2 8 Enderby. B.C. 5 Medicine CFEN-TV-1 Hat Alta. CHAT -TV 6 Port Reston. Nod. CBNT-1 13 CHCT-TV-2 13 Enderby, B.C. CHBC-TV5 72 Melita. Man- Barrie, Ont. CKX-TV-2 9 Prince Albert. Sask. CKBITV 5 CKVR-TV 3 Falkland. B.C. 5 Merritt, B.C. Bayview, N.S. CFWS-TV-1 CFCR-TV3 10 Prince George. B.C. CKPGTV 2 CICH-TV-2 6 Fisher Branch, Man. CBWT-I 10 Mita Creek Village. B.C. Big River. Sask. 9 Princeton, B.C. CHGPTV-1 5 CKBI-TV-5 Flin Flon, Man. CBWBT 10 5 Bon Accord. N.B. CFZQ-TV2 Prince Rupert CFT K -TV -1 6 CHSJTVI 6 Fort Francis, Ont. CBWCT 5 Micoua, Que. CKHQ-TV-3 6 Bonavista, Nfld. CJON-TV2 10 Promontory Mountain. B.C. Fort Fraser, B.C. CKPG-TV-3 6 Midway. B.C. CKMYTV1 7 Bonnyville, Alta. CKSA-TV-2 9 CFCRTV-12 5 Faxwarren, Man. CKX-TVl II Minden, Ont. CHEXTV-2 10 Quebec, Que. Boss Mountain. B.C. Gaspe. Que. Moncton. N.B. CBVT II CHAUTV-6 10 CBAFT II CFCMTV 4 CFCR-TVl6 7 Gaspe West. Que. (Bechervaise Moncton. N.B. CKCWTV 2 Boston Bar. B.C. CFCRTV-9 5 CKh11-TV 5 Mountain) CFGW-TV-1 6 Mont Blanc Peree, Que. Bowen island. B.C. 13 Quesnel, B.C. CFCRTVII 7 CBUT.4 Goose Bay, Nod. CFLA-TV 8 8 Bowen Island, B.C. CFGW-TV2 Quesnel, B.C. CKCQ-TV1 13 Grand Bank. Nod. CJOXTV-1 10 Mont Climont, Que. CHAN-TV-2 3 Red Lake, Ont. CBWAT-3 10 Grand Falls, Nod. CJCNTV 4 CKBL-TV-1 11 Bralorne, B.C. CFCR-TV-t5 3 Regina, Sask. CH RE -TV 9 Grande Prairie, Alta. CBXAT 10 Mont Georges, Que. Brandon, Man. CKXTV 5 Regina, Sask. CKCK-TV 2 Grande Vallee CKHQTV5 13 Brooks, Alta. CFCN-TV3 9 CKBL-TV-3 II Red Deer. Alta, CKRD-TV 6 Greenwater Lake, Sask. MontLaurier. Que. CBFT-2 3 Bullhead Mt., B.C. CJDC-TV-2 8 Revelstoke, B.C. CFZQTV-1 9 4 Mont -Louis. Que. CKBLTV-4 2 Burmis, Alta. CJLH-TV-3 3 CKBI-TV3 Rimouski, Que. CJBRTV 3 Haliburton, Ont. 5 Mont Tremblant. Que. CBFT-I 11 Burnaby. B.C. CHAN-TV 8 CKVRTV-3 Riverhurst, Sask. CJFB-TV-3 10 Halifax. N.S. CBHT 3 Montreal, Que. CBFT 2 Burns Lake. B.C. CFT KTV-3 4 Rlviereau-Renard CHAU -TV -7 7 Halllax, N.S. CJCHTV 5 Montreat, Que. CBMT 6 Cabano, P.O. CKRT-TV-4 5 RivIere du Loup, Que. Hamilton, Ont. II Montreal. Que. 12 Calgary, Alta. CFCN-TV 4 CHCHTV CFCF-TV CKRTTV 7 Hearst, Ont. CBFOT-2 7 Montreal. Que. 10 Calgary. Alta. CHCT-TV 2 CFTMTV Riviera du Loup, Que. CFCL-TV-4 4 Moose Jaw. Sask. 4 Callander Ont. CFCH-TV 10 CHABTV CKRT-TV3 13 High Prairie, Alta. CBXAT-2 2 Mount Timothy, B.C. Campbellton, N.B. CKCD-TV 7 Roberval, Que. CKRS-TV-3 6 Hison, B.C. CKPG-TVI 10 CFCR-TV-6 5 Camp Woos. B.C. CFNVTV-1 3 Rouyn, Que. CKRN-TV 4 Houston, B.C. 2 Moyle, B.C. Canning. N.S. 10 CFTK-TV-10 CKVS-TV-I 5 Saint John. N.B. CHSJ.TV 4 CJCHTV.1 Hudson Hope, B.C. Mt. Parizeau, B.C. Canoe, B.C. CHBC-TV.8 3 CFTK-TV-8 Salmon Arm, B.C. CHBC-TV-4 9 11 Mt. (near Canoe Mountain. Near CJDC-TVI Poole Queen Saskatoon, Sask. CFQCTV 8 Huntsville. Ont. CKVR-TV-2 8 Charlotte) B.C. 4 Valemodt, B.C. CFCR-TV14 8 CHQCTV-I Sault Ste. Marie, Ont. CJIC-TV 2 Invermere, B.C. 6 Murdochville, Que. Carleton. Quo. CHAU -TV 5 CFWLTV1 Savona. B.C. CFCR-TV-7 8 Inverness, N.S. CJCB-TV-I 6 C KBL-TV-2 6 Carlyle Lake, Sask. CFSS-TV 7 Schetferville. Que. CFKL-TV II Jonquiere, Que. CKRSTV 12 Castlegar. B.C. CBUAT-2 3 CKMUTV1 Senneterre, Que. CKRN-TV-I 7 Jubilee Mountain, B.C. Nakusp, B.C. 2 Causapscal, Que. CKBL-TV-5 6 CJNP-TVI Sheet Harbour. N.S. CBHT-4 II CFWL-TV2 8 CJNP-TV2 4 Cawston, B.C. CH KC -TV -3 3 Shelburne, N.S. CBHT-2 8 Juskatla, B.C. CFTK-TV-7 2 Noss Camp (Near Lava Lake) Celista, B.C. CHBC-TV-6 6 Sherbrooke, Que. CHLT-TV 7 Kamloops, B.C. CFCRTV 4 B.C. Chandler. Que. 7 CFTK-TV6 Sioux Lookout, Ont. CBWAT-2 12 CHAUTV4 Kapuskasing, Ont, CBFCT-1 12 Nelson, B.C. CBUAT-I Chapleau, Ont. 7 Skaha Lake (near Penticton), CFCL-TV6 Kapuskasing. Ont. CFCL-TV-3 3 Newcastle, N.B. Charlottetown, P.E.I. CKAbITVt B.C. 10 Kearns, Ont. CFCL-TV2 2 Newcastle Ridge, B.C. CHBC-TV-7 CFCYTV 13 Smithers, B.C. CFT K-TV2 5 Kemano, B.C. CFTKTV-5 2 CFKB-TVI 7 Cherryville, B.C. CJWR-TV-1 10 Sointula, B.C. CFKB-TV-4 5 Kelowna, B.C. CHBCTV 2 New Glasgow, N.S. CFCY-TV-1 .7 Chicoutimi, P.O. CJPM-TV 6 Seances Bridge. B.C. Kenora, Ont. CBWAT 8 Ninkish. B.C. Chilliwatk, B.C. CHAN-TVl II CFNV-TV-2 CJNA-TV-I 3 Keremeos, B.C. CH KC -TV -1 5 Nlpawin. Sask. CKBI.TV-4 2 Cheticamp, N.S. CBFCT 10 Squamish, B.C. CHAR -TV -1 7 Kildala. B.C. CFTKTV-4 5 North Battleford, Sask. Chicoutimi, Que. CKRSTV-2 2 Squamish. B. C. CBUT-5 II Kingston. Ont. CKWSTV II CKBI-TV-2 7 Churchill, Man. CHGH-TV 4 St. John's, Nod. CBNT 8 Kitchener, Ont. CKCO-TV 13 Ocean Falls, B.C. CFT K -TV -9 2 Clearwater, B.C. CFCR-TV-10 2 ClON-TV 6 Kokish, B.C. CFKB-TV-2 9 Olalla 11 Clinton, B.C. 9 CHKC-TV2 Ste. Marguerite Marie. Que. CFCRTV4 Labrador City, Nfld. 13 Oliver, B.C. 8 Cloridorme, Que. CHAUTV-8 6 CJCL-TV CHBCTV3 CHAU -TV -1 2 L'Anse a Valteau, Coleman, Alta. C1 LH.TV.I 12 Que. Ottawa, Ont. CBOFT 9 St. Quentin. N.B. CHAU-TV2 10 Corner Brook. Nod. CBYT 5 CHAUTV9 7 CBOT 4 Ste. Rose du Dégeló, Que. Corner Brook, Nfld. Lethbridge, Alta. CJLH.TV 7 C10HTV 13 CKRTTV2 2 CJONTVI 10 Lillooet, B.C. CFCR-TV1 II Outardes, Que. CKHQ-TV-2 12 Stephenville, Nod. CFSN-TV 8 Ont. Cornwall. CJSSTV 8 Liverpool. N.S. CBHT-I 12 CKHQ-TV-4 7 Stranraer, Sask. CFQCTV-I 3 Coronation, Alta. 10 CKRD-TV Lloydminster, Alta. CKSA-TV 2 Parry Sound. Ont. CKVR-TVI 11 Sturgeon Falls. Ont. CBFCT 7

124 Location C.L. Chan. Location C.L. Chan. Location C.L. Chan. Location C.L. Chan. Winnipeg, Man. CBWFT 3 13 CFTOTV 9 Waterton Park. Alta. Sudbury, Ont. CBFST-I 12 CBWT 6 CKSO-TV 5 Trail. B.C. CBUAT 11 CJWP-TV-I CFWS-TV-2 12 C1AYTV 7 Current, Sask. CJFB-TV 5 TroisRivltres. Que. CKTM-TV 13 Westwold, B.C. Swift CRXT-2 9 Sask. 6 Sydney, N.S. CICB-TV 4 Upsalnuitch Lake. N.B. Whitecaurt. Alta. Wynyard, CKOSTV3 CFRN-TV-3 12 Temiscamtng, Que. CBFST2 12 CKAM-TV 12 Yellowknife. N.W.T. 3 Val D'Or. Que. CKRN-TV-2 8 Williams Lake, B.C. CFYKTV 8 CJTK-TV-1 8 Terrace, B.C. CFTK-TV 3 Val Marie, Sask. CJFBTV-2 2 CFCR-TV5 Yorkton, Sask. CHOSTV 9 7 Vancouver. B.C. CBUT 2 Willow Bunch, Sask. N.S. CBHT-3 II The Pas. Man. CBWBT-I 6 Yarmouth, 6 Vernon. R.C. CHBCTV2 7 CKCK-TV.2 Timmins, Ont. CFCLTV 9 'turn Mountain, Balfour, B.C. CBFOT 9 Victoria. B.C. CHEK-TV 6 Windsor. Ont. CKLW-TV CKNXTV 8 CKBFTV-I 5 Toronto, Ont. CBLT 6 Ville Marie, Que. CKRNTV-3 6 Wingham, Ont.

World -Wide shortwave transmitter on 6065 kHz and 6190 to 6200 kHz. Would you believe I300 Shortwave Stations to 1600 GMT? Now for the scoring, each item (except Once again we take oil on our big DX number 3) earns you 20 points. For num- contest-the one without the prizes-hut her 3. score I point for each station logged. also the one that separates the novices from If you score 20 you're in sad shape. 40- the know -ít -ails. Take a whack at these and you show promise. 60-means you're on the see how you do: hall. 80-faniastique! 100 -we don't believe 1. Hooray! Several DX'ers have re- you! ported hearing the Voice of the U.N. Com- mand at Deragawa, Okinawa-long an it on This Issue's Contributors . elusive exclusive DX catch. Look for Wilfred Adams, New Hope, Pa. 9845 kHz around 1130 GMT. Martino, Brooklyn, N. Y. -to -hear Bennie 2. How about a rather hard Al Schwartz, Olympia, Wash. country: Spanish Sahara? They're on the Fred Nottingham, Ardmore, Okla. standard broadcast hand just to make things James Gibson, Kew Gardens, N. Y. Richard Curtis, Ft. Valley, Ga. hut they're running a shiny more difficult, Kerry Matthews, Miami Beach, Fla. new 50.000 -watt rig to help you along. N. LaRosa, New York, N. Y. Schedule is 0900 to 1300 and 2000 to 2400 Phil Ohman, Vancouver, B. C. GMT. Martin Kortlander, Buffalo, N. Y. 3. How many ship stations can you log Ted Arndt, Cleveland, O. William Crosby, Chicago, Ill. in a 30 -minute period on 2738 kHz? That's Donald Brownson, Alliance, O. an intership channel. Tom Kneitel, New York, N. Y. 4. New country? Try on Biafra. a break- Sy Reynolds, Atlanta, Ga. Salt Lake City, Utah away state in Western Africa-might he a Barry O'Brien, Steve Francisco, El Paso, Tex. short-lived one too. As of this writing. Irwin Morton, Montreal, Que. they're on the air as the Voice of Biafra front Greg Hobart, Fargo. N. D. Enugu. Watch for them on 4855 kHz (also Charles Cotton, Augusta, Ga. Russel Cook, Ottawa, Ont. at 1830 to 2230 GMT. 4775 kllz) Thor Nordstrom, Minneapolis, Minn. 5. You'll adore Andorra if von hear their

Location GMT kHz Call Name Location GMT kHz Call Name 5990 TGJA R. Nuevo Mundo Guatemala City, 90 -Meter Band -3200-3400 kHz Guat. 0045 6000 PRK5 R.Incontidencia Belo Horizonte 0015 3230 VRH8 Fiji I. BC Suva, Fiji Is. 0400 6005 CFCX Montreal, P.Q. 2000 3990 - V. America Monrovia Liberia 0700 601G YSS R. Nacional San Salvador, 3995 VQ04 - Solomor Is. 1010 El Sal. 0505 6035 - R. Globo R¡o de Janeiro 2345 60 Band -4750-5060 kHz 6046 HJCB V. del Tolima (baque, Colombia 0350 -Meter 6065 PRL8 R. Nacional Rio de Janeiro, Braz. 0625 Dahomey 0530 4870 R. du Dahomey Cotonos, 6070 Toronto, Ont. 0920 0135 CFRX 4872 TGQH R. Santa Cruz Santa C-uz, Guat. RSA Johannesburg, 0610 6075 - R. 4890 R. Senegal Dakar, Senegal S. Africa 0500 Moresby, VLK4 Australian BC Port 6082 OAX6Z R. Nacional Lima, Peru 0300 Papua 0905 6085 ZYK2 R. Jornal Recife, Brazil 2340 4915 R. Ghana Accra, Ghana 0550 6090 HISD R -TV Dominicana Santo Domingo, 4923 HCQRI R. Quito Quito, Ecuador 2230 D.R. 1045 Ivory 4940 R. Abidjan Abidjan, VLI6 Australian BC Sydney, Austral. 1025 Coast 0600 6103 DMQ6 Deutsche Welle Cologne, W. 4955 HJCO R. Nacional Bogota, Cclombia 0030 Germany 0005 Cclombia 0515 4965 HJAF R. Santa Fe Bogota 6120 Swiss BC Berne, Switz. 0545 V. Amazona Manaus, Brazil 0345 - 5025 6130 CHNX - Halifax, N.S. 0900 5030 YVK R. Continente Caracas, Venez. 0710 6135 - R. Habana Havana, Cuba 0415 6150 VLR6 R. Australia Melbourne, 49 -Meter Band -5950-6200 kHz Austral. 1035 6160 - BBC London, England 0400 R. Reloj San Jose, C.R. 0130 5970 - R. Canada Montreal, P.Q. 0900 6215 TIHBG R. Centinela Lo¡a, Ecuador 0235 5985 - R. Portugal Lisbon. Port. 0310 6257 - 125 FEBRUARY -MARCH, 1968 kHz Call Name Location GMT kHz Call Name Location GMT

41 -Meter Band -7100-7300 kHz ' 25 -Meter Band -11750-11975 kHz

7105 - R. Free Europe Munich, Germany 0400 1750 - R. Kiev Kiev, USSR 0410 7120 - BBC Tebrau, Singapore 1130 1760 - Vatican R. (Vatican City 0110 7130 V. Free Taipei, - Formosa 1113 1775 - Swiss BC Berne, Switz. 0715 7135 R. Monte - Carlo Monte Carlo, 1780 - R. Japan Tokyo, Japan 1130 Monaco 0500 1785 - Radio Berlin Intl Berlin, E. Germ. 2200 7150 - R. Moscow Moscow, USSR 0200 1795 - R. Nacional Rio de Janeiro, 7185 - R. RSA Johannesburg, Braz. 0000 S. Afr. 0515 1800 - R. Nacional Espana Tenerife, Canary I. 2230 7190 - R. Australia Melbourne, 1805 - R. Sweden Stockholm, Sweden 0200 Austral. 0340 1810 - R. Australia Melbourne, 7710 R. Senegal Dakar, Senegal 0700 Australia 0950 7225 - R -TV Marocainne Rabat, Morocco 0600 1815 - NHK Tokyo, Japan 1000 7265 - R. Tirana Tirana, Albania 2005 1820 PJB PJB Bonaire, Neth. 7270 - R. RSA Johannesburg, Antilles 1105 S. Afr. 0500 1855 Far East BC Manila, 9360 R. - Nacional Madrid, Spain 2320 , 0935 9491 OAX6H R. Tacna Lima, Peru 0250 1860 - R. Accra Accra, Ghana 2020 - BBC London, England 0630 1875 - R. Berlin Intl Berlin, E. Germ. 1045 31 -Meter Band -9500-9775 kHz 1895 - R. Senegal Dakar, Senegal 2330 1900 - R. RSA Johannesburg, S. Afr. 2100 9500 C E950 R. Corporation Santiago, Chile 0345 1910 HSK9 R. Bangkok, Thailand I I l5 9505 NHK Tokyo, Japan 0900 HCJB V. of Andes Quito, Ecuador 0230 PRB22 R. Record Sao Paulo, Brazil 0935 1940 R. Bucharest Bucharest, 9510 YVXJ R. Barquisimeto Barquisimeto, Rumania 0150 Braz. 1120 1945 R. Canada Montreal, Que. 2300 9515 XEWW V. America Latina Mexico City, Mex. 0115 1950 ELWA R. Village Monrovia, Liberia 0710 9520 V. ZL18 New Zealand Wellington, N.Z. 0730 1970 R. Tunis Tunis, Tunisia 0145 V. America Tangier, Morocco 2235 1990 R. Prague Prague, Czech. 0000 9525 R. RSA Johannesburg, 2095 BBC London, England 0300 S. Afr. 2135 5030 R. Peking Peking, China 1255 9530 VUD 'All India R. Delhi, India 2330 5050 R. Liberdad (clandestine) 0005 9535 Swiss BC Berne, Switz. 2310 5056 R. Euzkadi (clandestine) 1530 9540 ZL2 R. New Zealand Wellington, N.Z. 1115 5060 R. Peking Peking, China 0000 9580 R. Australia Melbourne, Austral. 1000 9590 - R. Nederland Bonaire, Neth. 19 -Meter Band -15100-15450 kHz Ant. 0200 9595 BC Tokyo, 1045 JOZ3 Nihon Japan 15110 ZL21 R. New Zealand 'Wellington, N.Z. 0540 9600 C E960 R. Santiago, Chile 2320 Presidente 15115 HCJB V. of Andes Quito, Ecuador 0300 9605 DMQ9 Deutsche Cologne, Welle W. 15125 R. Nacional Lisbon, Portugal 2335 Germ. 0250 15135 Trans World R. Bonaire, Neth. 9610 VLX9 Australian BC Perth, Austral. 1120 Antilles 1300 9615 VUD R. All India Delhi, India 1130 15140 R. Moscow Moscow USSR 1115 V. Tangier, America Morocco 0530 15155 ZYB9 R. de Sao Paulo Sao Paulo, Brazil 2100 9625 BBC London, 0545 England 15160 R. TV Francaise Paris, France 1600 4X851 Tel Israel Kol Yisrael Aviv, 2020 15165 V. Denmark Copenhagen, 9640 V. Free Seoul, S. 1035 Korea Korea Denmark 1245 9645 V. HCJB of Andes Quito, Ecuador 0835 15175 R. Norway Oslo, Norway 2300 9655 R, Havana, Habana Cuba 0630 15180 R. Moscow Moscow, USSR 0610 9660 Brisbane, Austral. Australian BC 0720 15185 R. Habana Havana, Cuba 1000 9665 Swiss BC Berne, HEU3 Switt. 2015 O1X4 R. Finland Helsinki, Finland 1645 9667 R. Colombo Colombo Ceylon 1240 15200 R. Moscow Moscow, USSR 1600 9675 Havana, R. Habana Cuba 0630 15215 R. Free Europe Munich, W. Germ. 2200 R. Japan Tokyo, Japan 1020 15225 R. Bucharest Bucharest, 9680 Lisbon, R. Nacional Portugal 0305 Rumania 0230 9685 R. Sao Paulo, ZYR227 Gazeta Braz. 2340 15230 R. Habana Havana Cuba 0335 9690 LRA32 RAE Buenos Aires, Arg. 0605 15240 R. Sweden Stockholm, Sweden 1905 9695 Swiss BC Berne, Switz. 0510 15285 R. Ghana Accra, Ghana 1830 9700 R. Sofia, Sofia Bulgaria 2330 15315 ETLF R. Voice of Gospel Addis Ababa, 9705 R. RSA Johannesburg, Ethiopia 1340 S. Afr. 1010 15320 R. Moscow Moscow, USSR 2035 9710 RAI Rome, Italy 2030 15325 HCJB V. Andes Quito, Ecuador 2000 9715 R. Tirana, Tirana Albania 2000 15350 R. Berlin Intl Berlin, E. Germ. 2250 9725 Kol Yisrael Tel Aviv, Israel 2115 15380 R. Nac. Espana Tenerife, Canary 9730 R. Berlin Intl Berlin, E. Germ. 0230 Is. 2015 9735 DMQ9 Deutsche Welle Cologne, W. 15440 WNYW R. N.Y. Worldwide New York N.Y. 1735 Germ. 0515 17680 R. Peking Peking, China 0125 9755 R -TV Francaise Paris, France 0000 9760 R. Ghana Accra, Ghana 2030 R. Nacional Espana Madrid, Spain 0305 16 -Meter Band -17700-17900 kHz 9770 Viennese R. Vienna, Austria 2300 9833 R. Budapest Budapest, Hungary 0340 17720 BED39 V. Free China Taipei, Formosa 0245 9865 YDF6 RRI Djakarta, 17740 - R. Moscow Moscow, USSR 2030 Indonesia 1100 17765 - Deutsche Welle Kigali, Rwanda 1745 9883 R. Peking Peking China 0345 17770 - R. Liberty Munich, W. 9915 VUD India R. All Delhi, India 2145 Germ. 0400 9920 R. Peking Peking, , 2225 China 17775 - R. Nederland Hilversum, Neth. 2310 11672 R. Pakistan Karachi, Pakistan 2015 11705 R. Vatican Vatican City 1930 R. Sweden Stockholm, Sweden 0400 13 -Meter Band -21450-21750 kHz 11710 R. Moscow Moscow, USSR 0400 11715 PJ B PJ B Bonaire, Neth. 21485 - R. Vatican Vatican City 1050 Antilles 0410 21535 - Springbrook R. Johannesburg, 11720 R. Canada Montreal, Que. 2200 S. Air. 1400 11725 R. Brazzaville Brazzaville, Congo 0515 21545 - R. Ghana Accra, Ghana 1500 11730 R. Nederland Hilversum, 21630 - BBC London, England 1630 .0645 21710 - BBC London, England 2100 R. Moscow Moscow, USSR 0330 21735 - R. Prague Prague, Czech. 1580 11740 CE1174 R. Nuevo Mundo Santiago, Chile 1110 25650 - BBC London, England 1610

126 RADTO-TV EXP£RTMENT£R .(who under the recently -adopted Incentive Peanut -Whistle Hams Licensing Regulations now get a 2 -year li- cense probably one of the most gung- Continued from page 50 term) ho organizations to join is the QRP Amateur Radio Club -International. This is a group of really know how to use their present short- some 3000 amateurs scattered throughout the wave receivers to best advantage? "Perhaps world who are dedicated to low=power oper-

I in 500." declares Katz. ation as their contribution toward relieving Trade Secrets. Skilled operators are in- the tremendous QRM and congestion now deed few and far between. Unlike the re- running rampant on all popular ham fre- ceiving and antenna sub -categories, there is quencies. With the built-in 75 -watt restric- no loyal following nor guidelines which a tion on Novices, the QRP Amateur Radio new Ilea -power enthusiast can look to for Club is practically tailor-made for these new- direction. No leader exists who will acknowl- comers (though it by no means is restricted edge that he is any more than an '`average" to Novice operators alone). Qualifications: operator, and few reports have ever been You must run under 100 watts input (200 published which reveal the secret techniques watts p.e.p on sideband) to he eligible. those sacred few employ to achiexe 12.000-, Hitch: If you're ever caught manning a mile DX contacts with about $45 worth of transmitter which exceeds this limitation, equipment. Two things arc clear, however. you're drummed out permanently. Nearly all record -breaking QRP contacts With supporters the world over, the QRP have been scheduled well ahead of time, and A.R.C. sponsors contests for its members, most seem to have taken place in the wee presents awards for best performances with hours of the morning. But aside from this, the least power, and publishes a quarterly the boys just arn't talking. newsletter chock full of interesting accounts Closer examination, however, reveals that of organizational news and individual case the tricks the truly skilled use are nothing histories. Cost for lifetime membership is more than exemplifications of the Ultimate only $2.00. easily within reach of the average Receiver and Kraus theories: (I) The more low -power enthusiast. Send your fee along gain and efficiency you have in your antenna, with a request for membership to QRP the less power you need to make contact: A.R.C. secretary John E Huetter, K8DZR, (2) the more "trained" your ear is the better 2146 Chesterland Ave., Lakewood, Ohio your chances of interpreting what an average 44107. ham would call an "unreadable signal." Add What can you expect if you join the flea - to this the fact that nearly 85 percent of power community? Heterodynes, swishing the hard-core QR Pers use code transmissions VFOs. pileups, clobbering, and plenty of (CW) for DX work, and you begin to see QRM-to say nothing of a gradually in- the light. creasing feeling of insecurity and inferiority. The fact that power limitations overseas If you're willing to weather the disadvan- are far more stringent than in the U.S. may tages. however, you may he as lucky as New help explain why peanut -whistles tend to he Zealand's I.es Earnshaw. ZLIAAX, who the in Hgs abroad. Particularly in the managed a fine QSO with Kentucky running U.S.S.R., Germany, and Australia, transis- only 20 milliwatts input! Or maybe W6TNS torized transmitters are the vogue and who receised his Worked All Continents QRI'ers talk not in terms of watts, but milli - award back in 1959 using only 80 milliwatts watts. with a homehrew transmitter designed for In the U.S. and Canada, enthusiasts gen- Novice hand operation. Or maybe even the erally build transmitters that are simpler in author, who managed 40 states (confirmed design. Yet they conduct themselves in the through QSI.$) simultaneously on both 80 same manner on the air. Once a contact has meters (with 3 watts) and 6 meters (with been established-regardless of the distance 5 watts). involved-power is cranked down tb the - But if you become a true dyed-in-the-wool barest minimum and then measured. This QRPer, look out. Just exceed 100 watts once, provides for follow-up QSL cards that read: and you'll have all of hamdom's low -power 'Transmitter-',4th watt input to an RCA addicts to contend with-to say nothing of 2N247." a formal QRP International drumming -out Three Thousand Strong. For Novices ceremony!

FEBRUARY -MARCH, 1968 127 equipped with a crystal for 162.55 MHz and Hot Line To Weatherman then used as a portable weather receiver. Cautioned from page 99 Construction. You might try your hand at constructing a receiver to get the weather broadcasts. A very sensitive and easily made no squelch, it works remarkably well. It receiver is the superregenerative type. These makes use of the AM receiver and a crystal receivers work well at 162.55 MHz and are controlled convertor to receive VHF, and quite sensitive. They present few construc- employs the slope detection method to de- tion problems and a number of articles have modulate the FM signal. been published on building them. Convertors. There are numerous manu- Reception. As is well known, the dis- facturers that offer VHF convertors that, are tance that you can receive VHF frequencies used in conjunction with AM receivers. The well depends to a great degree on the height receiver can he either an auto radio, home of your antenna as well as the height of BCB radio, shortwave receiver, BCB tran- the antenna at the transmitter. Hills and sistor portable, etc. This type convertor has valleys between the two antennas can cause to he wired into the receiver and instruc- dead spots, or poor reception. It is recom- tions outlining how to do it are supplied. mended that a good antenna, mounted high Some types, such as the Metrotek "Listen - and iii the clear, he installed. This will re- in" portable convertor, doesn't have to be sult in more consistently good reception. wired into the receiver. Just place it along- A proper VHF antenna is needed for side. fixed, tunable and combination receivers as Ameco offers a selection of models which well as two-way mobile radios for best re- can he used for various receivers. One of sults when used as weather receivers. When the Ameco convertors can be connected to close to the Weather Bureau station, an an AM marine radiotelephone and used to 18 -in. -length of copper wire can be used as receive weather broadcasts by setting the ra- an antenna. It is positioned vertically and diotelephone on an unused channel. Of the then connected to the receiver "ANT" ter- types available are a selection utilizing tubes minal. In a car, an 18 -in. whip can he in- or transistors. Some are tunable through stalled in the center of the roof. As men- several bands. tioned before, better results can he obtained VHF Marine Radio. If you have when an external antenna is used, mounted VHF/FM marine radiotelephone, it is easy as high (in the clear) as possible. The use to provide for reception of weather broad- of coaxial cable between the antenna and re- casts. Just install a 162.55 -MHz crystal in ceiver is recommended. an unused marine channel setting and that Shipboard. On boats, where space is at is all it takes. If you have a VHF/FM ma- a premium, the antenna can be one of sev- rine band walkie-talkie, you can do the same eral varieties. All of them are verticals or thing, that is, if you have an unused chan- variations thereof and should be mounted nel available. as high as practical. Coaxial cable is re- Used Equipment. A two-way VHF/FM quired between the antenna and receiver. mobile radio will operate beautifully as a Noise in the VHF band is usually much weather broadcast receiver. These units can lower than in the AM broadcast and MF he picked up from two-way radio equipment marine band. Also, a true FM receiver dis- dealers who take them in on trade when criminates against noise impulses. new units are sold. An FM receiver will give the clearest and Much of this equipment is obsolete wide most noise free reception. When a VHF hand FM that cannot be used commercially, convertor is used with an AM receiver, so can he gotten cheaply. Realize that you speech will not sound as clear because the won't use the transmitter portion. so install detector is not as efficient as an FM demod- a crystal in the receiver section for 162.55 ulator, which uses a discriminator, ratio de- MHz and you have an excellent weather re- tector or gated beam circuit. ceiver. Removing the tubes from the trans- Whether you use a true FM receiver, or mitter section will cut down considerably on an AM receiver/VHF convertor combina- power drain. You should be able to get one tion, there are benefits derived from hearing for about $75. up-to-date weather broadcasts from United There are also lots of obsolete wideband States Weather Bureau stations, a govern- VHF/FM walkie-talkies around that can be ment service for the public.

128 RADIO -TV EXPERIMENTER connected to the common push -in terminal. Mini-Jector On the front of the probe body, "directly Continued from page 92 opposite the common push -in terminal, cut a slot with cutters; then solder about 6 in. of insulated stranded wire to the common down when using Mini-jector, or a mini- terminal. Solder about 2 in. of #20 or #22 ature toggle switch. Solder the connecting solid wire to the staked terminal (the out- leads'to the switch before installation. The put), slide the wire into the test prod tip, and wiles should he long enough to allow the mount the front of the test probe. Two hoard to be removed for battery replace- screws hold the front assembly in place. Now ment. Mini-jector is ready for use. After the switch is installed, position the Using Mini -lector. As a general rule, the board so it is just ready to enter the probe injector's ground lead must be connected to handle, then cut the leads from S1 to the the equipment under test, even for RF signal exact length and solder. Since the leads injection. The injector's output has been must fold under the perf-board when the deliberately limited to about 0.1 volt, so you assembly is inserted in the tube, SI's con - need not be afraid to apply the injector's output to a transistor base-you won't dam- age the transistor. Should you check Nlini-jector's output with a scope, you will note that the signal ¡M.téCTOR" at QI's collector is essentially a square wave, "2"--.,_ L 2...Y.7.Cx-.'. 1 while the output at Q2's collector is not square-it is more like a sawtooth. This is normal. The component values for Q2 have been selected for a sawtooth output, which has a higher harmonic content than a square wave. Completed Mini-jector is' ready to go The total battery current drain is approxi- to work tracking down the culprit mately 0.25 0.5 mA, the battery, in just about any piece of electronic gear, to and from hi-fi tuners to public address systems. under normal usage should rival shelf life. If you don't use the unit for a considerable necting leads should he #24 stranded hook- length of time, remove the battery-to avoid up wire or thinner. damage in case the battery corrodes and The common test lead (ground) will be leaks on the circuitry.

Frequency Operator & Call Lucky 13 for Bored DXers (kHz) Location Continued from page 74 12825 x FFP7 Government Fort-de-France, Martinique Frequency Operator & 12808 KPH Radiomarine Corp. Call Location (kHz) Bolinas, Calif. OST Government 12890 x VCS Dept. of Transport 12781.5 Camperdown, Brussells, Belgium N.S., Canada 12770 x NDT U.S. Navy 12885 WMH Radiomarine Corp. Tokosuka, Japan Baltimore, Md. 12768 PCH5 Government 12885x SAG Government Scheveningen, Goteburg, Sweden Netherlands 12883 NBA U.S. Navy 12765 x H1Q Government Balboa, Canal Zone Cartagena, Colombia 12878 JCU Government 12763.5 DAM Funkamt Hamburg Choshi, Japan Norddeich, 12875 x NPG/NLK U.S. Navy W. Germany Vallejo, Calif. 12760 x OXZ Government 12840 WPA Radiomarine Corp. Lyngby, Denmark Pt. Arthur, Texas 12750 PJK Dutch Navy 12826.5 WNU Tropical Radio Tel. Suffisant, Curacao Slidell, La. * Ships at Sea 12826.5 JCS Government 12534 Tokyo, Japan 12558 Ships at Sea

FEBRUARY -MARCH, 1968 129 Lion is just by listening. American amateurs Shortwave For Non-SWLS tend to concentrate in the low end of the Continued from page 58 phone band when calling foreign Hams and you can quickly spot band openings by listen- ing for DX hounds calling "CQ DX." teur newS media will pick up the information Regardless of what set of frequencies and pass it around. you like to tune, your organization and prepara- Overseas Hams. Some foreign amateurs tion is the key to logging good DX. you tend to stay on one or two frequencies and After are familiar with the bands and can almost have approximate hours and/or days of oper- identify a station by its modulation charac- ation. Such information can be gleaned from teristics and transmitting frequency, random examination of the NR RC's amateur section. tuning can yield good results. Again, notes can be arranged by time. By knowing the characteristics of the One DXer prepares a 3x5 card on each band or bands, and knowing the stations that amateur representing a new country, listing are normally present, a stranger will stand information mentioned above, Yhen tacks out. the cards to a bulletin hoard. Thus, he can One of the keys to being a good SW DXer quickly refer to any item at a glance. is keeping your equipment in good Another method of picking up informa- shape. Install the hest antenna you can-a wire as high and as long as your space limitations permit. And arranging your listening post for convenience will make those dial -twiddling hours more fun and productive. When making logs, put your notes in one book and, when full, file it away. Happy SWLing. Shortwave listening can be an interesting hobby. You can he Johnny - HallicraHers - - - WR-2000 on -the -spot rather than waiting for the six o'clock evening news on television. And, you can get first-hand experience at comparing political points of view. The basics of joyful SWLing is to acquire some of the above -mentioned reference ma- terials and at least one club bulletin, and then plan your listening. See how other Healhkif listeners do it, use the best of their ideas, and A. '3. GC -IA compare notes. Ask questions and do some Some special types of receivers can be used reading. You'll he surprised at the results of for SWLing. For example, above is a deluxe a little diligence and perseverance when you table model set featuring several SW bonds; go back to those dials. and put your "ear to below is portable transistor all -band job. the world,- as it were.

into a Honeywell H-800 computer for analy- Mood Monitoring sis. Continued from page 78 This revolutionary three-year experiment proved to the Honeywell scientists that they could definitely monitor brain waves in re- fled and average responses were computed sponse to defined stimuli. These patterns cor- with a Nlneumotron Computer. The com- related very closely with conventional pat- puter is triggered by the output of the same terns of sleep and awareness. and sere con- waveform generator producing the clicks. firmed by the TV monitoring of the subject's Therefore, the brain potentials in response to behavior. As Honeywell scientist Donald I. the clicks are treated as signals by the com- Tepas summed up: "We can now effectively puter. Other brain potentials, not in response monitor human behavior." to the computer stimuli, are treated as noise He concludes that we will one day he able and effectively cancelled out. to tell whether or not a soldier on the battle- Output is recorded on an X -Y plotter and field is weary, a pilot in the air alert, an astro- on punched paper tape. The tape is then fed naut far out in space awake or asleep.

130 RADIO -TV EXPERIMENTER put in her shirt pocket. Everything else she CB Moonshine pitched out the window. Continue/ from page On At that fork, the road turned to clay. "Take it easy now, or you'll skid right off the road." Mary June scanned an FCC com-

latch onto that legendary QSI . So, coming plaint. It wear out the window, too! East and passing this close anyway, figured I laughed. "What happens then?"

I might as well give it a good personal try. "We'll have to walk the next four miles." Climbed slowly to the top of a ridge, and "Nice day for a walk." Like 1 said, once there just below and beyond was Seven I got the QSL Seven Creek and I would per- Creek-three unpainted houses, general manently part. store, church and a one room school-just "Wouldn't bother me none. I do it every like I pictured it. I parked in front of the day. But don't figure you're in shape." general store which doubled as a post office. Decided I wasn't so we crawled along at A bunch of kids gathered round to stare at 10 miles per hour. my '68 Buick. I took my keys out of the Mary June put my rig on the air. "Moun- ignition, moved out the car and into post taineer, this is daughter. I'll he there direct- office past a blonde Daisy -May type in the ly. I'm bringing somebody with me you'll doorway who was also admiring the Buick. want to meet." I walked kind of tall up to the old fellow He came back. "I'll he waiting, girl." behind the cash register. "Where can I find Mary June shut the CB off entirely and the Mountaineer?" a funny feeling began around the hack of He looked me over a few seconds then my neck. Five minutes later the road came gave out with a long hillbilly type laugh. to a dead end in front of their cabin. "We're all mountaineers, hoy." "Come on, papall be waiting inside." She "I mean the fellow that gets his mail under moved on out of the car and up the path. that name. The one that talks on the radio." I took a long deep breath, followed. Just "Never heard of him." as soon as I was well clear of the car, Moun- There were a couple others seated in the taineer stepped from behind a big pine tree far corner. They shook their heads in uni- with shotgun pointed squarely at my middle. son then all three decided to ignore me. But He stood silent for a few seconds, looked me as I left, the gal in the doorway followed me over. "Who is he, girl?" to my car. "What do you want with the "He's an engineer and he says he wants Mountaineer?" to help you sell your compressor." Mary Lying smoothly. "I'm interested in his June brought forth the batch of orders from CB compressor." her pocket. She got in the car without being asked. "Don't need no selling help." "You can get one of those by mail." She "But being an engineer he can help you ran her hand along the upholstery. with that technical problem." A gleam in "I'm in the wholesale business." Decided her eye. "You know, the meter." to meet con with con. "Thought maybe we The ,old man grinned. "And besides, be- could work out a deal." Once I got that ing kind of a pretty man, you'd like to keep QSL, yours truly would be long gone. him a while." "You're one of them engineer fellows." Mary June blushed. "Well, he is a man." I nodded. It was the truth. Mountaineer motioned toward the cabin "Papa's been working on some refine- and we all started walking that way. "Yeah, ments for his compressor." She considered hoy, maybe you can help me. You've seen it. "Maybe you could help him." how the S -meter on your rig tends to jump "He's your father?" when E use the compressor?" "That's right." She produced a packet of I nodded and Mary June opened the door CB mail all addressed to the Mountaineer. for us. "You start this thing and I'll direct you." "Well, that don't look so good?" He put "Okay." We headed West, out of town himself down in a rocking chair. "And to and over another ridge. "What's your keep Mary June happy, I figure you can just name?" be my guest until you figure out a way to "Mary June, an' when you get to the next keep it from jumping." fork turn left." She began opening mail. So it seems I'll latch onto that rare QSf_ Those letters containing money Mary June for sure, but how do I get home with it?

FEBRUARY -MARCH, 1968 131 Dynamic Duo Tapeless TV Recorder

Continued from page 77 Continued from page 68

operation range can he determined from the ing could then be made insensitive to the curves by using the following formula: action of light. This may he what CBS says is a "sort of development process." /e The basic characteristics of the photo- Beta = or Beta = - chromic dyes would fit the needs EVR lb of letand ZJb= admirably. since they can provide images of Ole=les- extremely high resolution. (In actual fact. Following this formula and using the a square inch of film treated with such a dye values given on the curves. we can determine can record the contents of a large book!) beta and see if the transistor is operating This is in keeping with CBS's claims that the within its linear range. EVR film can store much more information Beta for curve 1: than can magnetic tape, and that the EVR 1mA system could be coupled with such devices - 50 as the firm s Linotron electronic typesetter. .02mA The idea that a photochromic process such as this', or something akin to it, under- lies the EVR process gains credence when it is noted that one collaborating company is a major manufacturer of dyes. Ciba Ltd. (a Swiss manufacturer of dyes) and Imperial Chemical Industries (England) jointly own Ilford Ltd., a well-known manufacturer of photographic materials. All three are in- volved with CBS in the EVR project. DmA It is only a guess on our part that CBS 3V 6V 9V might he using a photochromic process, and Typical curves that finished Dynamic CBS isn't ready to either confirm or deny Duo will display on your scope the idea at this time. But until CBS actually let you check vital transistor statistics. reveals the techniques used, this guess is as Beta for curve 2: good as any other. 2mA EVR Vs. VTR. Manufacturers of EVR 50 equipment, and those making magnetic video - recording .04i A tape (VTR) systems, will un- battle hard If the two values of beta are equal or very doubtedly for future educational and home consumer markets. video close in value, the transistor in both curves For equipment customers this spells better equip- is operating within its linear region. 'As a ment lower prices. check, figure the beta using the delta cur- at rents. As things stand now, EVR may have a L\1e= 2mA -1nrAorlmA significant price advantage over VTR. EVR L\/b= 40uA - 20uA or 20uA playback units are tentatively pegged at 1ntA $280, hut even this relatively low price may drop as demand for the equipment increases. Beta = - or SO .02mA In comparison. most VTR equipment now costs upward of $1000, but prices arc going To match transistors for any applications, down steadily and may drop more because of pick a desired transistor and connect it to technologic advances and the pressure of im- the tracer. Adjust the curve tracer for the mirient rough competition from EVR. desired curves and grease -pencil the two In fact, one California company (Newell curves on the scope's screen. Now, without Associates) reports that it has devised a new disturbing the tracer or scope controls, con- magnetic video tape deck that can bring nect similar transistors to the tracer until you color video into homes at prices approxi- find one that has approximately the same mating the cost of an ordinary 1V set. The curves. company has also developed a very compact

132 RADIO -TV EXPERIMENTER tape reel (less than 2 in. in diameter) that guidance of Dr. Peter C. Goldmark, Presi- can pack about 45 minutes of program mate- dent and Director of Research of the CBS rial into channels on standard t/a in. tape. A Laboratories in Stamford, Connecticut. full-length color movie can reportedly by put Twenty years ago Goldmark turned a on this magnetic tape for only $20. groovy technological trick by inventing the The anticipated cost of EVR film is front 331/2 -rpm record which was to revolutionize $7 to $14 per 20 minutes of black -and -white the recording industry. But the flip side of material. This figures out to $21 to $42 per Goldmark's success story came out more hour. The cost of color hasn't been esti- than a little scratchy. The color -TV system mated as yet, but it would undoubtedly he he also invented lost out to the now standard substantially more inasmuch as double the system developed by RCA, the arch rival of amount of film is needed. The magnetic tape CBS. and EVR film costs already appear to be Has Goldmark avenged his loss by beating competitive. out RCA and others in the educational and Premium For Flexibility? Price is not perhaps home video recording field? It's the only factor involved when a customer much too early to tally the final score. But attempts to choose between a magnetic video if RCA or anyone else has anything to show, system and the EVR system. Flexibility of they will show it at first opportunity. Dr. operation can he a deciding factor for many. Goldmark has already amply demonstrated And in this respect EVR has to take a back that he is not given to twiddling his thumbs seat. after one or two successes-or failures. If EVR can only he used to play films that EVR can he improved in any way, he is have been factory -programmed; it cannot surely trying to find out how. he used to record video programs directly But that's a battle the technological giants off the air. On the other hand, VTR can play will have to wage on their own. The rest of purchased tapes, record programs from TV us can only sit at ringside and make our broadcasts, or tape live action by the use of bets about the final outcome. One way or video cameras. Moreover, magnetic tapes the other, we can't lose. It is bound to be a can be erased and used to record new pro- good show in more ways than one. gram material; this is not possible with EVR The only real problem for us is this: when film. friend husband stops his new EVR film to You can bet a silver dollar against a contemplate the virtues of a contemporary burned -out resistor that video experts in Gina Lollobrigida for twenty minutes, does many companies are working feverishly to his wife have the right to demand equal ogle develop other systems they aren't breathing time with male cinematic idols? a word about. There is no telling what may Beer and pretzels, anyone? he up their electronic sleeves. Whatever it is, it will be shaken out as quickly as possible to prevent EVR from getting too much of a head start in what promises to be a revolu- tion in TV use. No one system is ever likely to monopolize the video recording business. There will un- doubtedly be a demand for both EVR-type systems as well as for magnetic tape systems. The situation is analogous to the present healthy demand for both magnetic tape re- corders and LP records. Not everyone cares about recording his own material; to these people playback alone is sufficient, and they will go on buying ready-made LP records and pre-recorded tapes. Similarly, some will want flexible equipment that can do all things in the video field; others will be quite happy with only playback equipment such as EVR, especially if the cost is lower. "Oh Gladys, you know that kit you got me i Intrepid Inventor. The EVR system cre- with those step-by-step instructions . . " ated by CBS came into being under the

FEBRUARY -MARCH, 1968 133 that Ham Traffic General test. This should be ample time for anyone with a real desire for a higher Continued from page 90 ticket to get it. Oscar Again. Project Oscar, forgotten by many hams since its spectacular appear- 9. What is chirp and how it can be reme- ance in the headlines a few years ago when died in a CW transmitter? the first ham radio satellite was Don't orbited, is let number 7 scare you. It sounds still in business and growing. like they want a description of the manu- It's now a permanent organization, based facturing process for making transistors, at Foothill College. Los Altos, Calif., co- which could take an engineer all day to ex- ordinating world-wide amateur interests in plain. Actually, they merely want you to satellite projects. The staff is an outgrowth understand that transistors arc made of of the Oscar 1 crew. layers of n- and p -types of semiconductor Though many of us don't have the equip- material. Then they want to know which ment or the know-how to actively participate layer is the emitter, which is the base. and in future Oscar experiments, we'd still like which is the collector. 'You're supposed to to keep up to date on what the space bunch be able to identify each on a schematic dia- is doing. A good way to do this-and just gram of a transistor and know the difference about the only way for the casual ham-is between a pap and npn transistor. Then they to monitor Oscar bulletins, which are trans- want you to know the key characteristics mitted on 40- and 20 -meter CW frequencies such as alpha, beta, and cutoff frequency. wheneler there's Oscar news to report. That's all. To get the latest from Oscar. look for . , . And Not So News. Due to a slip of W6ASH on 1'4.030 MHz at 0200 GMT and the typewriter; the table of new FCC amateur on 7.015 MHz at 5055 GMT on Fridays. frequency assignments on page 108 of the Remember your GMT conversion, fellows. January 1968 RAmó-TV EXPERIMENTER Those transmissions both occur on Thurs- carried an error that may have inadvertent- day evenings, local USA time. ly discouraged some Novice operators. A to STATEMENT O!OWNERSHIP, r."tr.. footnote the table said Novices would MANAGEMENT r,4,..: ANO CIRCULATION ' . r..- rAn./ G.L. II, Iv. nv y`''',.. .ar. not be allowed on two meters after Novem- rr. n U.N L... <,/.r v, F"' ,vÓCT 1 1967 I

134 RADIO -TV EXPERIMENTER 0 o CLASSIFIED lar, c

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Your classified ad will appear in SCIENCE & MECHANICS MAGAZINE as well as in a minimum of four other SCIENCE & MECHANICS PUBLICATIONS. Write now for information to C. D. Wilson, Manager, Classified Advertising, SCIENCE & MECHANICS, 505 Park Ave., New York, N. Y. 10022.

FEBRUARY -MARCH, 1968 135 You can earn more money if you get an FCC License

...and here's our famous CIE warranty that you will get your license if you study with us at home SATISFIED with NOT your present in- ting your license is widely accepted Malt Sluczynski, come? The most practical thing proof that you know the fundamentals Senior Transmitter you can do about it is "bone up" on of electronics. Operator, Radio your electronics, pass the Station WBOE FCC exam, So why doesn't who and get your Government license. everybody "tink- ers" with electronic components get an "I give Cleveland The demand for licensed men is FCC Institute credit for License and start cleaning up? my enormous. Ten years ago there were The First Class about 100,000 answer: it's not that simple. The Commercial FCC licensed communications government's stations, including those licensing exam is tough. License. Even for police and In fact, an average of two though I had only six weeks of high fire departments, airlines, the merchant out of every three men who take the FCC exam fail. school algebra, CIE's AUTO-PRO- marine, pipelines, telephone companies, GRAMMEDTMlessons make elec- taxicabs, railroads, trucking firms, de- There is one way, however, of being tronics theory and fundamentals easy. livery services, and so on. pretty certain that you will pass the I now have a good job in studio FCC exam. And that is to take operation, transmitting, proof of per- Today there are over a million such one of the FCC home study courses offered formance. equipment servicing. Be- stations on the air, and the number is by lieve me, CIE lives up to the Cleveland Institute of Electronics. its promises." growing constantly. And according to £1' Federal CIE courses are so Chuck Hawkins, law, no one is permitted to effective that bet- Chief ter than 9 out 10 r' Radio of every operate or service such equipment CIE -trained Tech nIcon, Division without a Commercial FCC License or men who take the exam pass it...on 12. Ohio Dept. without being under the direct super- their very first try! That's why we can of Highways vision of a licensed operator. afford to back our courses with the iron -clad Warranty shown "My CIE Course This has resulted in a gold on the fac- enabled me to pass mine of ing page: you get your FCC new business for licensed service tech- License or both the 2nd and 1st your money back. _ nicians. A typical mobile radio service Class License contract There's a reason for Exams on my first pays an average of about $100 this remarkable attempt...I had no a month. record. From the beginning, prior electronics It's possible for one trained CIE has training either. I'm now in charge of technician to maintain eight to ten specialized in electronics courses de- Division signed Communications. We ser- such mobile systems. Some men cover for home study. We have devel- vice 119 mobile units and six base as many as fifteen systems, each with oped techniques that make learning at stations. It's an interesting, challeng- perhaps a dozen units. home easy, even if you've had trouble ing and rewarding job. And incident- studying before. ally, I got it through CIES Job Place- Coming Impact of UHF ment Service." In a Class by Yourself Glenn Horning. This demand for licensed Local Equipment operators Your CIE instructor gives his and service technicians will be boosted un- Supervlsor,Westcrn divided personal attention to the les- Reserve again in the next 5 years by the mush- Telephone rooming sons and questions you send in. It's like Company of UHF television. To the 500 being the or so VHF only student in his "class." "There's no doubt television stations now in He not only grades operation, several times that your work, he an- about it. I owe my many alyzes it. And he mails back his 2nd Class UHF stations may be added by correc- FCC Li- the li- tions and comments the same cense to Cleveland censing of UHF channels and the sale day he receives your assignment, so you can Institute. Their FCC of 10 million all -channel sets per year. License Course read his notations while everything is really teaches you still fresh in your theory and fundamentals and is par- Opportunities In Plants mind. ticularly strong on transistors, mobile radio, troubleshooting and math. Do And there are other exciting opportu- Mail Card for Two Free Books I use this knowledge? You bet. nities in We're aerospace industries, electron- Want to know more? The postpaid re- installing more sophisticated elec- ics manufacturers, telephone compa- ply card bound tronic gear all the time and what I -in here will bring you learned from nies, and plants operated by electronic free copies of our school CIE sure helps." automation. catalog de- Inside industrial plants scribing opportunities in electronics, like these, it's the licensed technician our ENROLL UNDER G.I. BILL teaching methods, and our courses, All who is always considered first for pro- together with our special booklet, CIE courses are available under motion and in the new G.I. Bill. If you served on ac- -plant training programs. "How to Get a Commercial FCC Li- tive The reason is duty since January 31, 1955, or simple. Passing the Fed- cense." If card has been removed, just are In service eral government's now, check box on FCC exam and get - send your name and address to us. reply card for G.I. Bill information. ECleveland Institute of Electronics CI 1776 E. 17th St., Dept. EX -24, Cleveland, Ohio 44114 Accredited by the Accredidng Commission of the National Home Study Council, and the of only tome study school to provide completeeorerage electronics fundamentals plus such up-to-date applications as: :Microminiaturization Modulation Laser Theory and Application Suppressed Carrier Single Sideband Techniques Logical Troubleshooting Boolean Algebra Pulse Ticory Tlmebase Generators...and many more. 136 RADIO -TV EXPERIMENTER ..s--ies. : ' ` =::' ' : -«:. ;..-«;== ....a :- ' . ' `,^ . ..-"""111M111111111111111011,-.. .. i...... Vi~:i \ ':

fil:l:~3:41~"..~v. 011.. N,1D,1`kttümmllalta! ''''=""... I11:15ERUICOMMll1I1'ATIONS, UMMLiti1O `` ttncttl. 13n w1111111ºNtttJxthermg_Vpn FIRST ( L V\N FIN1 . :11,7 a Better than 9 out of 10 CIE men win their ''ticket' the VO1y first time fg they try IS' VIr

Cleveland Institute of Electronics 4,:'_, {..,i1 r;,. of success in obtaining a ,. Government FCC License f,'ti The Cleveland Institute of Electronics hereby warrants th it 1.. upon completion of the Electronics Technology, Broadcast or First -Class FCC l.icens; course, you will be Engineering. 1) able to pass the FCC examination for a First Class Con- mercial Radio Telephor e License(with RLdar Endorsement ; ,;: OR upon completis.0 of the Electrorle Communications course you will he able to pass the F('C examination for a . Second Class Commet-ial Radio relephc ne License; 01'j AN 1) in the event that you are unable to pass the FCC test for the course you select, on the very fi st try. you will r=- ;1, ceive a FULL REFUND of all tuition payments. a ! This warranty is valid for the entire period of the com- 1. . pletion time allowed for the course selected. :.

i,. - {' C,%.tI ... '1 . ,ti. 1 C. O. Allen !, , President I;

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