Qyu

STAR-SEV HEADSET CONVERSION This adapter will enable you to use 'Star-Setheadsets with an Icom IC-2AT(or a similar HT). The IC-2AT has about 12 volts present in the mike line to power an external electret condenser mike. This voltage is used to power the ''Star Set as well. To key the PTT you use the mike mute switch on the belt clip of the StarSet. The PTT works by completing the mike circuit If you want to use the set on both the radio and a telephone, simply unplug it, because no changes are...

Comihumicatioms Corp

INQUIRE ABOUT SURPLUS7 RX & TX BOARDS. REDUCED PRICE Norristown, PA 19401 (215)63117101 H-S e List of Advertisers on page ti4 The proper heat sink will preserve transistors. Learn how to keep your circuitry from resembling a core meltdown. Kenneth H Shamburger 1413 Clendale Creenvilte TX 7S4iJT Heat is a hazard to all electronics projects. Many electronits enthusiasts have experienced the displeasure of watching a prized project destroy itself with heat. Understanding heat transfer and...

Compap

The sync-generator countdown frequency-divider cha in. other engineers as happened with SSTV exactly twenty years ago My profession is electronics-concepts design engineering, but I was caught in the aerospace layoffs of 1969 and have not been active in it since then This means I am not up on the newest devices and technology, and accordingly will not submit any schematics The most interesting things about this proposal are that The entire channel, video and sound combined, can be...

Line S

Our Comfortable and durable T-Shiris irc the finest i ti itity available. Make up your own message, DXCC, WAS. WAC Hams do it with higher frequency, DX Hound. DX*Peditions, Please QSL ind any other message. Up to m* hnes oT 10 large letters each m up to 12 lines of 20 small letters each. Discounts for Cluh orders and E-REF logo with orders for 12 or more 1 AST MAIL OK DER CALL LEI TER HATS tOi Um St. Suite 4, i'eterborouph. NH 03458 ck Money Order Charge Card _______Exp Date. Add 52 To TotaL...

SK

Socket For 4CX5 0 A,R t J, 4CX1 ,OOOD, iCXl5tOOOA J Socket For Chinmey For 4-2 5OA,4ODA 0OC,4PR4OOA Socket For 4CX2 50B,BC, FG,Rt4CX350AtF,FJ Socket For ACX250BlBClFGt i, 4CX350A, F, F J Chimney For 4CX250BtBCpFGtR,4CX350AtF,FJ SP R 5520,00 260.00 74.00 36.00 390.00 51.00 73,00 11 ,00 60.00 60.00 66.00 10.00 66.00 34.00 36.00 7 1.00 22 5.00 225.00 Hb, 00 225,00 40-00 225.00 300.00 57.00 650.00 585.00 Chimney For 4CX25 B,BC,FC,R, 4CX350A.F

South End In

A hamtest swap i snop will be held on Sunday Jarua-y2. 19& 3. v Ceniury Genie-downtown on US 33 One Way North between the St. Joseph Bank budding and the river South Bend in. tables areS3.00 each n a carpeted, halfecre room. The Industrial History Museum is in the same building Fou1 ane highways Jead to the door from at' directions Talk-in on 52 52, 99 . 39. 9 33, 7& i& ea-.M 145 43, and 145 29 For more Information, contact Wayne Werts K9IXL 18 9 Riverside Drive, South Send IN 46616....

Info

Tfllephone 1414) 241-8144 Thiansville, Wisconsin S3092 I-Hat* HA t Gaitied Hide Acceptarct Mn the Wieur M ii* D*rT n HaTi.eii xhk -HI acroi th uS *UHh DK TOO tntirt DX CilUt n MQU Ch ' e NtnJeWHnds PLUS *Bur0 l rly 4Morh Etiler YOUR Atlas Pigt f + C0 *IAftU Cpntifitnt * in ist Rarem . ' ide *lAtitudt *L onn1tud > lL S Inf a Coft'hiutei fur TOufi t)Tti, EXACT fit s Itefldinq Mllci 'MloMtrn Comptre Accuracy Caiiipire i f f U 1 ency 'Cprapaii> Uieabi Hty Contplet,antsi PLUS PREFI> Cross...

No

3-Element Moif bandera also available Optional BN-86 balun recommend d tor above antennas ELECTRICAL performance is not based on theoretical calculations alone but is tuned and tested for optimum results on our government approved test range Hy-Gain s factory tuned 52 ohm Beta Match rs exclusive and assures positive dc ground for lightning protection and reduced precipitation static. Though sometimes unconventional, our meticulous element spacing assures maximum F B ratio and uncompromising...

Emj

Mflfl l UES-A5S S2A b FnnttC Ciicui Eittiii - Pn-QnUad. M M P.C.fi. PfltwttioFnst rt. I Wt. MK, a J b'lU Dhmi, 7- nBti5 S.flb Rsctuf Kit W Watt. 5 C*t*n Tim. 4 9& Pom Tri iKlonrar, PRh-11 JVAti S fi- 24VAC ZiOmi ( Sji Panri Muunl PmanJinmrtfrt ind KftOtrt MK& T ano I-5KAT * s mh b.li 1 7SS14.SWD Z- r va -pd R Jtlfifi 2-J H t fl aCf3-SW flK Diytit Ki . 9-p S 54 9 KC3ySW CSflniir Oiii C pKnur Kti 50 W -JMCH . IQ OCT-S WO VmiHt Crnmi InrnnvCtimiMr it Cid Kit. 18.7*t 2-f ti...

Wmw

J Store Hours Mon-Thurs 8-5 MST, STArNi_ S STEEL WHIP- FIBERGLASS LOADING COIL - PATEN I APPLIED. NO COILS TO CHANGE LtSS THAN 1 6 VSWR ENTIRE TUNING SANGE TUNE 3.2 TO 30 Mhr FROM THE OPEPATOHS POSITION - FAST AND SLOW SCAN RATES The MoOel MT 1RT mobile amerwaiu eftX2IQ30 Fnctuaive TOOwaitsCW 1500 alts PEP 'or hams military WAHS CAP ri I conirrfinal service Cen et nigr e icte . Enables 1 jfling 1 t resonance lo waited trequflflcy Allows full output *t an solid slate' na N * ort aoout reduced...

Hod

Fig. 7, Typical electrolysis circuit goodies for the shack at a relatively low cost. The secret is in silver reclamation. Silver reclamation ts generally thought to require expensive capital equipment and in large photo labs it does, but for the amateur, the equipment can be very simple. How simpie is determined by the amount of silver-saturated solution you have, how rapidly you obtain it, and how fast you want to reclaim it. The silver-saturated solution referred to is the photographic fixer...

Disconnect

Connecting the decoder board to the receiver 26 73 Magazine * January, 1983 162 400, 162.475, and 162 550. This is facilitated in the unmodified alarm receiver by operating the c rys-tal padded with either a < a pacitor, an inductor, or nothing. A three-position switch on the rear of the unit is provided for this purpose Since we will be operating on a fixed frequency, this is an unnecessary feature and must be disabled (We set the switch in the unpadded position and epox-ied it in...

Fvdms

CW filter 50.00 CW filler. 50.00 XF8.9KA 6 KHz 8-poie AM fifter. .50 00 XF10.7KC 800 Hz 6-pole 3rd IF CW filter 45.00 board 20.00 KY-ONE Curtis 8044 keyer unit < 45 00 YM-36 rjojse can* mobile mic. .20 00 YM 37 Mobtie microphone 10,00 YM-38 Scan desk microphone .39 00 MD-1B8 Desk microphone . . . .69.00 MH-1B 3 Mobile microphone 20 00 SP-901P Speaker patch 76 00

Frequencies

3560, 7060. 14060. 2T060 280SG 3900. 7270 14300 21370 2& 570 37Z5 7125. 2H25. ncl20i25 Multiply the numbei of iero-districi counti'-s by tne number ol con'acts Zeros score by adding ARRL sections, zero-distri 1 counlies, arid DXCC counhies Worked and Ihen multiplying by total contacts Certihcaies will be issued to all entrants Anr submit a log and an SASt E' dorsements will be given tor the high SCOre pt ARRL in, DX country and Novice Technician Class Mail logs by February t5th to WflSI....

Computerizing

With over 40 of the 73 read ers computerized and with thousands more eyeing the Timex computer 4 I'd like to make sure there is no misunderstanding I want to see you experimenting with amateur radio applications of these contraptions and writing up your results for 73, The readers are interested in articles on getting nd of com puter noise, .in protecting the computers from interference from the rig . in RTTY applica lions , . .high speed code . beam aiming, log keeping automatic GSLing packet...

Butternut Electronics

GARY AlRPOfVT BOX .it I- t HTf 3 S-v-. i.i .Rros T K X'V . --il-iSiH the vfo, our Morse-code communications has changed hardly at all in 50 years. And other than the shift to SSB, phone commit nications is almost identical to hamming of 50 years ago. complete with pileups on DX, jamming. endless nets, and so on. We've had praciical RTTY on the ham bands lor over thirty years and there still is no noiice-able denl in traffic handling as a result. Amateur radio, which at one time was the spawning...

S

ELPAC POWER SUPPLIES S LVSERiES FULLY REGULATED puls IC's on Iheir true row to row spacing One side is ior 300 ttinfrrii Fliptocloverfot devi'ci on 600 oenlers Pul de ce n I and squeeze TOOL DOES a Thru 40 PENS' StocuNo 11059 S1 2-95 Mim D PirrHnh Riling nifnLhHL + 19 J 5CHV*1-1 I ' r A J JA* sot ' r - e qa n n f nun I I n Z 414 i t IJW M 'U1 H

No Reservations Will Be Accepted By Telephone

Dayton, OH 45401 or phone (513) 849-1720, Admission 7.50 in advance, 9,00 at door ( felid for all 3 days) Banquet 14 in advance, 16 at door. Flea Market Space 15 in advance, ( Md for both days) Make checks payable to Dayton HAMVENTION. Box2205. Dayton, OH 45401. Bring your family and enjoy a great weekend in Dayton. Sponsored by the Dayton Amateur Radio Association, Inc. My Gain Antennas TH7DXS 7 element tnband beam -TH5HK2S 5 element triband beam TH3MK3S 3...

Mst

Using two antennas to obtain phase cancellation of the noise. This particular system uses two inductively-loaded vertical dipoles. This system is illustrated primarily to demonstrate the third difference between signals and noise this antenna by itself w not work as well as a shielded loop or a ferrite antenna. so that the small amount of remaining noise from each antenna arrives at the receiver in opposing phase In a noisy environment, probably the best choice is the shielded loop....

Distributor Price

Wit A ruin PflOOF rrr HINAL STfllFt ro HVmflF iff ah RCRJN& I ONNF r TlflN < Nil MOPE SPACING ftlOHT *MiLl AfT H PF UMII' y ntiOL on Toll Fr** Inskie Ca (BOO) 352-2553 Outside (WO) 421-2533 served that the LO was operating, and proceeded to retune the rt and LO stages. Unable to lower the tuned frequency adequately by squeezing the inductor coils closer together, we added capa< itors in parallel to the tank circuits to bring the tuning in range of the coils All the while we monitored the...

Wild Rover

J. r I I c- vpur .-H irTT f h-IT1 1 Sled Its VAC ( VW30 Fnibohn' re tu * Ms. 14 10 33 1 JO 1 t 20 A 1.1ft 3 ELPAC POWER SUPPLIES DC fDC CONVF rERS al tow i singling one conductor out of ii'i.iny without disarriji irj rnpnt ----* Block No C 4mpere& Pries 1 731 -S A 35 SO 13732 O-tfflJA 39SO aMowsiasl reacr ig it AC OA rcon- zAs plon of m cjLiH ertt w m

Results

THE 1ST ANNUAL 40 A0 PHONE CONTEST A TREMENDOUS SUCCESS Truly unbelievable, it Fantastic Nke catcnm' fish a barrel. , . Those wefe ine vwords and phrases echoed by nearly every contestant in 7Ts First Annual 40- and 80-Metnr Phone Contest There is little doubt rhai this evem will remain or> the contest calendar to* many years to come. We arr> grateful to those who made n all happen After tne dusi had finally sort Jed. VE5DX became the world JO-Meter Phone Champion for JnQle-operator...

Never Say

Are you going to be wasting your time Ihe second week of January chasing some fool DXpedition around twenty meters or are you going to be oul with a bunch of us on the slopes of Aspen. HTing it and having a ball That s the low season in Aspen so the prices are still a bargain and it's right after the Winter Consumer Electronics Show in Las Vegas, if youVe in the electronics industry. During Ihe day. Chuck Martin WA1KPS (Tufts Electronics) wili be leading the kamikaze group down the expert...

Zzzzzzz

The XYL shouts, Will you turn that thing down and stop fussing with the lights I'm trying to watch TV and iron All your clocks were set to WWV from your watch, which you had to set at a friend's QTH because you can't even hear WWV at yours Now alt the clocks are out of whack since you played with the breakers. You run all over the yard, using a little, plastic 6-transistor AM radio your Aunt )enny gave you for Christmas back in 65 and you've hardly used for anything until now. Some places the...

Wre And Wng Meter World Champions

The moil activity ever heard on 160 Best contest tve ever operated . An absolute winner Oi fmriei will try again next yertr rnese Wfclcomu cotn-incms war* heard again and again in the wake of 3*& I9fi2 top-bant event. 'Wrappe J up my WorHeu An Slates ihrinks to the contest i worked another new country1 ' These were some of the rewan i3 earned for ust a few hour -, of con test ope aiion t y nearly 1500 part pan is. if you r j a supporter oi 190 meters, you can't help but noiice how much i he...

Private Patch

A giant step forward in non-sampling Autopatch Interconnect technofogy, capability and standard features, Our revolutionary new techniques of audio and digital signal processing offer several advantages over conventional sampling scanning type Autopatchesi 1. The annoyance of continuous squelch tails Is totally eliminated. Makes conversation much more natural and enjoyable. 2. In addition to superb simplex cspabimy, operation through repeaters is made possible. 3. The...

Star View Model K

More than 100 Channels Accessible THE STAR VIEW 12K SYSTEM KIT CONTAINS 12 Foot Antenna Azimuth EUvttlon Mourn * 24 Chanrvit Receiver *120 Low Nolle Amplifier * Feed Horn Cables & Connector * No Modular Included (May be ordered separately for 79,95) Available through your local Craig Star View dealer Call or write for information * Dealership inquiries welcome Price subject to change without notice.

Hunting Lions In The Air Contest

Starts 1200 GMT January 15 Ends 1200 GMT January 16 Theconiest is sponsored by Lions Ciui international and coo diinaled by L ons Club Rio do Janeiro Arpoador Brazil Par-hcipaiion in thu contest is open lo all duly licensed radio operators. I.ion jrid non Lion There a*'* two mode. .-hone anil CW Participation in both modes is allowed but pomts are counted separately ah amateur stations participating must operate within their licensing regulation Separate Cfl' goiies emsi 'or singly operators...

M

Put a broad bandwidth 8 M dipole in 24 ft with the SLINKY DIPOUEIL antenna. Comparable low SWR, space savings and performance on ALL HF bands, including S X L and WARC. Complete kit 2 special 4 coils, 50 RG-58 U coax, bafun kit. mounting hardware and ir istructions. Great for apartments, condominiums, motels and vacation use. Easy sei up and adjustment. Ask for FREE antenna comparison sheet Blacksburg Group 49,95 postpaid (in U.SA, Box 242 Suite 500 Money Back Guarantee Blacksburg, Virginia...

Id

tin Jiscsfvere and r eaiers AMATEUR ancJ COMMERCIAL Autant it Op iion dj sldt 3nc arnp iuae Shrill initiilatiorr - 7 10 15 voits DC 8 4L 1 icp raniF abfe mewa es dCr up to Z mm ong Mrto lesied dno prograrrvT voui me sagtis 0 * S39 Mod I fO . 2 to 10 r mj'e - rr SS9 We T'iff a compidi iule tfansnttei an< j rec& v IK S in j svi.rhtsi.-f.'f- for m te f anil ccmrrierciaj u& s, Re uOS our Ire fttTatofl fitto* Si *cr UPS srtp tng Mastercard ana VIS.A *etcomf-

Fight City Hall

I've sal here every month and read how you mink ihat the code requirement is hindering the growth or amateur radio Mhlnk you are missing a problem facing amateur radio ihyt Is much bigger than a CodK requirement The problem thai J am referring lo is local ordinances thai restrict or prohibit amateur towers and antennas. I can only imagine (he number ol harns wno have worked nard to upgrade and feethai now iS the lime to put up that drtamed-ol antenna system only to have then local...

P

Thermal circuit for the example without a heat sink. Fig 2. Thermal circuit for a semiconductor. power dissipated b the device I he thermal analogy carries this into the electrical thermal model by making power, identified by a capital P, equal to heat. (Sometimes the lowercase q'r is used to represent power because this symbol is used for heat in physics.) Our goal is twofold First, we must determine the temperature of the semiconductor chip If this temperature exceeds a safe vaiue, we...

Uml

UML432 1IKI 10W input MML43& 50 I0W njsji MML432- *Ut 1Wdr3Win IEK Ml i lomiiiK mjii. Wdtch f r deliiik 2 Meter J-Beams 12.3 dBd jjin 8 over 8 Horizon1 poj DS-2M *63 40 8 by 8 Vertical po DS-2M-vert 76,95 im 1300 MHz Loop-Yagi 129ivl ,Y 4i> .75 Send 36c siamps for full details ol all our VHF UHF hems. Pre-setecior filters Transveners Low-pass filters Converters VlSA Spectrum In t enwli onul, Inc. Post Office Bo* 1084S Concord. Mass. 01742 USA

Relay

LIGHT-ACTIVATED RE LA Y Fig. 1 shows a circuit which will trip relay Kl when the light-sensitive resistor R1 is in the darkness. A buzzer can be attached to K1 to indicate that the lights have dimmed. Any small signal diode can be used for 01, which suppresses the high-current inductive kickback, thus protecting Q2. Any NPN transistor can be used tor 01 and 02. R1 is a cadmium-sulphide resistor which has 5 megohms resistance in darkness and 100 Ohms'in bright tight. The resistor can be located...

Coo

Counterclockwise), a pulse will occur every 10 is R1 ma then be tuned up to ten times this value 10Xh fullv clockwise), in which case a pulse will be output every 100 Pulse width is similarly set with S2 and R4. S2 selects the same range values as SI, and R4 is used to tune the pulse width from one to ten times the value selected by S1 Pulse widths with duty cycles up to 90 may be set up (Duty cycle is defined as the ratio of time the pulse js on to the time of a complete cycle, times one...

Cook Books

TTL COOKBOOK by Don Lancaster plains what lTL'S howit works, and how to use it Discusses prac-tic.it applications Such as a digjtai counter and display system, events counter electronic slopwaich digital voltmeter and a digital lacnomeie' BK1 & 3 59 5G ' CMOS COOKBOOK-by Oon Lancaster Details the application o' CMOS me ioa po r logic fampty suitable for most applications presently dominated by TTL Required reading for every serious digital exp rimenter' BKiOn S10 5Q.- TVT COOKBOOK by Don...

Display Your Stuff

Automatic display oJ trans* mitted and received Morse and RTTY coded signals has come of age. It is proving to be most worthwhile for improving one's own transmitted fist and for allowing SWL's or visitors the opportunity to experience the thrill of Amateur Radio coded transmission. While no machine can yet match the ability of a skilled CW operator in copying poor fists or signals buried in the noise, the ME3A-RO by AEA excells even when compared against units costing much more. The large 32...

Mail Orders

A00 55.00 FOR SHIPPING AND HAN DLlNG INDIANA RESIDENTS ADD 4 SALES TAX. TRIONVX IND. fNC. 6219 COFFMAN RD. INDIANAPOLIS- ND. Un IM w4 xp ta 'rtnt l M It H-I f 1 I A *HOl h+IW WOhlU Of tV VII Hi, WITH TUqA'Q Nf* UODLL W *fl. CiHA hpFL CAI U IV CQ+tYEHTIEfl FetCtiM ill MA CJUlLl IV MiDEIAHO A ftUHfnFJAND l-lhTiin jliin It n-r hir (Wing nr InH.InQ I hli ihiEHa 4f*t AllriD T lyiHiT OflUWil flUI I rv i It - 1h t> I'lV nfll A MUST FQR k'iDFO T*H it. FHOM CAOLt TVt nn fstuiT jIIgm.' yju .j - iKilh...

SS

A compile one decoder on a single PC hoard Features 400' SOOO H Adfusiahle v a 0 lum pot woliaoe reg-L litron 56r IC Use1ui tof toucf tone hursl tfpiectron FSK er- Can also be used as a stable tone encoder Runs on 5 to i voiis Complete hit TD-1 S5 95 PfOdutes ip fird and downward wail cfiatii terrstir. ol a potree S Vw peak auc ic- output runs On -15 volts uses 3 45 ohm speaker Hkjn on S ib JpC. Lo JJSfffll Hlfl mnnlh rtf. Lif*l TB'hl l 10 Vour id Tfvprilta *gain Ov r 7 000 Sctd lo D tr Bf one...

Auto Scan Module And Battefiv Saveh

15 minutes to install scan restarts when earner drops otf busy switch controls automatic scan on-olf. in* eludes module and instructions Model AS-1 25.00 ft-207r battery saver kit model bs 1 14.95 No more dead batteries due to memory back up 30 ies& power dram when squelched Simple lo install step-by-alep inslrucltons and parts Included *4 mA memory backup reduced to 500 AA '45 mA receiver drain reduced to 30 mA improved audio fidelity and loudness

Day

HClf TtfSB 6KI1JU MSPUtt CMHtflB R 1*5U tWQOB rt it S ACTIVE K IIS DI6ns KAD JXM T 13 Hz. RAS F EL 10 Ml DIGIT DEFEAT ItUL fftn COLi M, 1QQ ni DRIFT t ft MS* 1, 3 B* H Ifiif H ' * Df t ' 1 - DEEP- S1UL US IS BUft* tut fB*T HCL - S J w FT, * KtLEtti m -' i.n It H ruAiii liUUK Jtai < P TM MfilK. HLl Ufa ia TfHM NMI KW Uli Orr j .- mit o. 1-C S ETEHfcVL M jlf - -- -t A. j . T BQ Ti fl TS1DD TSt-Jli W9 ffilfll fu i F 7 FT7td) HH1D4 Ali i. jnf . tllS.flC SPS seifttE VJffl WKtU flWl mhies F X UIVIM...

Kilobaud Klassroom

Makes learning electronics fun and easy. First published as a series in Kilobaud Microcomputing, the book combines the learning of essential theory with pruetical. hands-un experience* The course begins with basic electronic projects and culminates in the construction of your own programmable microcomputer The direct instructional methods ol authors Young fit Stark make KILOBAUD KLASSROOM a mpit way for you to acquire a > olid background in digital t-ltvtrenies BK7386 (419

Jgj

Sk just about any shortwave radio listener or look at the most recent is- tener-preference studies on international broadcasters, and you'll get the same an- Bush House, home of the BBC s Externa Services, in The Strand, London. (All photos BBC copyrightJ swer. The British Broadcasting Corporation (BBC) ranks number one There are a number of reasons for this popularity ranking, and I was turning them over in my mind as i walked down The Strand in London on a sunny day on my way to the BBC...

Ner

Inductance required to resonate with 200 pF ot capacitance f the middle range of a 365-pF variable) at various frequencies. This data may be used in conjunction with data provided with commercially available ferrite rodsfor the purpose of making a ferrite loopstick antenna. preamplifier, is available from Palornar Engineers (Box 455, Escondido CA 92025) at the time of writing. The ferrite loopstick is not electiostatically shielded. but it does tend to favor inductive coupling over...

Ac Voltage Tester

PiL . .nfo an, 11f> v 'ecept '0 eneck t(m.f vofTaae of 50150 VAC - j vertaNC Vorr-OhrrvNiiinnmmeter in mail package iVCCli VOCI in < ni Hl ir CpJf) l I L> r ii , I y t D-71 'ii. i nh I h > if. 4.8IB 11 J (k-t llt(l L> 71 IU- JfrT jlfb ' C- P P H CBJGH JUT ' , > T L CllNX ' , * - Simile -olary w > r h oo js-ht rn L j-ye t uy It i re d 5 3-' d< grt display 800 hours iperai r . I ti- w-ip smglt 9 -OiiTie' y Sf t.- t I u fictior (DCVoHs DC Amoi, Oifns AC -C O iXlt od Rests of...

Advertising

Ai t Mgr Ro Kii yOrt KAtGAV CfltneJfi Taylor sure cut a lot of ice in SI. Thomas. I was sorry to hear that Dick passed away recently., we'll all miss that incredible fist of his. Any serious CW operator could tell Dick instantly by the perfection of his fist. Please give me a hand with this so that we can bring amateurs worldwide together a bit. The end result win be a lot more interesting things for us to talk about perhaps bringing more DX operators onto our bands...

Aes Branch Stores

WIGKLIFFE* Ohio 44092 ORLANDO, Fla, 32803 LAS VEGAS, Nev. 89106 ISPfTVTfTTPR 28940 Euclid Avenue 621 Commonwealth Ave. 1072 N, Rancho Drive ISmUhUhM Phone (216) 585-7388 Phone (305) 394-3238 Phone (702) 647-3114 fWT FM O 11J B h 11 Ohio WATS 1-800-362-0290 Fia. WATS 1-800-432-9424 No In-State WATS 0h oide 1-800-321-3594 FS6 1-800-327-1917 1-800-634-6227 All 24 Satellite Channels Attractive Styling Digital Display UP Down Channel Button Control Fixed and Variable Audio Tuning for all Subtai...

Ai L

QPI ' R l *Rfvtff * I ' *Jft3 3 I (MO F H (< H, +.R J i999 PEN DESIGN A FILTER BY SPECIFYING AI L PARAMEU PS AND C JOOO INPUT T,* S G r-j - ir-mQ m W< T F 040 R5 3 t G P t jOS (Ri i - RM '060 f 0 ti 3 THFN PRINT 'NOTE - NTGA T UE Urt LUE OF 'ir V PFSTCirt BY SPECIFYING INPUT IMPEDANCE* 000 INPUT -l t * il l t Cl Ht *F1 tFt C* frC OIO W O If o R i TMFN PRINT 1 NOT F - NEGATl VF VALUE flF 3070 GOTO 4000 3999 PEtt OUTPIJV SEL T ION F flP APfIVE SFCtMFNTS 1010 PP1WT FOR 7H S flESjf M'...

Antenna

VHF ANTENNA HANDBOOK The new VHP Antenna Handbook details lhe ihoory, design, and construction of hundreds of difleront VHF and UHF antennas. . .a practical booh written for lhe average amateur who lake* joy in building, nol TuH of compie* formulas for the design engineer Parked witn fabulous antenna profecls BEAW ANTENNA HANDBOOK (New 5lh diliom- , William 1 On A Stuart D Go van Yagj beam theory oon siruciion and operation Information oo wtre teams. curves sod nuichmg systems a must tor S* *...

Arlington Heights Il

The Wheaton Community Radio Amateurs will hold llieii hnntest on February fc. 1983. ai Arlington Paru Race Track Expo Center, Arlington Hei jMs 'L T c*n is are S3 00 at Ihe entrance nnd 2 50 in ad jnce Doors will open at 8 CX' am Fiea market taoies are free and plenty f iigor space wjU be available There vuiiJI be a large commercial area (Including a com puter s ciion awards and ci*ar paved parking TalMn on 146 01 61 ana 1 6 94 For general information call W9JTO al (312J-231 9524 For advance...

Assembled Special

ASSEMBLED VARIABLE POWER SUPPLY 29.95 CIGAR ANTENNA 19.95 buy all three 79.95 (great (Sift Sbeaa for Htfoli atj caaan SUPERVERTERI assembled only____ 109.95 SELECTIVE PREAMPLIFIER 26.95 HIGH GAIN TRANSISTOR 6.95 DRIFT MODIFICATION 1.25 KD44 DISH ANTENNA 47.95 1691 Down converter, built & tested only. . . call for price

Associates

En GflVie, * 7C Sjngw Or r OOd VP2VL D- Vif WJ Ajfl ASSt PflOO CTlOM MANAGER PUB LICATI0NS Scalr W PMlbru * Fioita Davun aruce Hidm Jar> t pTflflior FrJlfKftS Q rlion Linda Ofr* t-nzi i Uyfli nii Goraal Donr.a Harlan Louis Mntini Dlanns K. RiL n Anne Rocchln Mary Stupor Dfibflrih Storni Thmiise Varvilfc Judl W.mbMly Divm Woj nft*

Atv Downconverter

Fi - A1- tc 'f> T- ATV aclrOn i efofeihevcomrnit k a complete station sn* TVC4 s to* you Great tot pubEic set vjce setups demos. ami gelling a > uddy mieresied Just add ananianna and a TV sen Lined to CH 2.3. or-4 and pi uq in to 117 Twr T C-4L extra low-noise version 105 delivered in USA HOMEBREWEftS ASK FOR OUR BAStC FOUfWKODULE PACKAGE CALL OR WRITE FOR OUR COMPLETE LIST OF SPECIFICATIONS, st at ion setup diagrams, and Optional accessories which Include antennas. modufaiorK. detectors,...

Awards

F or single opera Lor entnes he Ltons Club Intern a tlcnai win present trophies i .r hrsl, second and third place on both modes F ijrtn through tenth places will recerve plagues. - lro ny A ill De present- to 'he first-place radio ctubisOCkety or both modes In addition, each log sent by f jrtjf, ipan- . a minimum of 5 contacts ami receive a special certificate. Tne con test committee will also select and award the most ai live Lions Club participating in the contest Keep a separate log for each...

Back Issue Your Choice

-- - -_____- . - -T- .i ____li-i. ilii I P I , . jaitriiirf'S 0- 7 73010 73 BACK ISSUE 10 YOUR CHOICE S.J.J a I --- . i t. 00 73055 73 BACK ISSUE 25 YOUR CHOICE ItiOO Snipping Please add St.00 per magazine Orders of en magizines or iwenty-tive magazines add S7 50 per order *Uae the order card I ft thta magwlhe or Itemize your order on a separate piece of paper and mail to 73 Radio Bookshop Peterborough NH 03458 Be sure lo include checV or detailed credit card information No C.O.D. orders...

Barker Williamson

270 -15 road& .ndDipal Antenna 3,5-30 MHz 90 ft 5KWPEP 131,00 370-10 Portable Window Silt ApaiimenUMoblie Home VUNp Antenna covers 2, 6. 10. 15.20, 40 Meters plus 27 MHz 39, 0 331A Grid Dip Meter Solid Stale. Range 2 MH2 rnru 230 MHz, Tafces 9V Transistor Batiery r T., . T.,. T. . T, T r 112 00 374 Dummy Loan Wattmeter DC to300 MHi, 1500 Watts input 199.00 375 Coax Swllch, 6 Position Rear SO 239. 22 50 37ft Coax Switch 5 Position Side 55G-1 VLF Preselector tor5lS-1 and KWM-380, Limited...

Bash Reform

I am a 15-year-old at Hereford High, and I am writing about the public outcry (what Ht-tte there is of it) towards Bash Educational Services In 73 for November, you reporteo the failure ol B9 percent o* one of Bash's classes and restated your opposition to ihe books and classes. I must admit that 1 have great respeel for anyone wno takes a firm stand for their own opinion . However, I do disagree with you on the Bash Book debacle. When you reaily think about IL Sash s system was a radical...

Burlingame Ca

999 Howard Ave P (415) 342-5757 & mites south on 1 t from S F Airport 281T Telegraph Ave < 415) 451-5757 Hwy 24 Downtown Left 27th off-ramp A A * A LLP* N * AL - AM GO AMPr E MX * ABf*i - ASTR '1* 5375 Kearny Villa Road (619 560-4900 Hwy 163 & Qairemont Mesa Biv -AVANT--B HGHER-BEfl' T& i' JRtH-CAL OOO*- DE * - iCOU j u . - -E V.V-J - F -1 - LAftS K * TELE TELREK* TEuPC TE -'ET- TOSTAO - COW COU -ttS - C U 1 jf PTtt . S*CRAFT i DUWA DA'O'IG -L tMR VETZ - MF. - MlCfiO _JG JIMf -OCvC'S...

And The Falkland Islands Crisis

BSC is at Its best reporting on Significant news events, and the Palkiandi islands crisis certainly was a good example. First of all, trie regular news broadcasts generally ere an hour or so ahead of the wire services or what your local radio or TV station reported. You heard it first on BBC if you tuned it in. Second. BBC has special programs to deal with current newsworthy events, and the Falkland situation was no except Hon. On May 2, nghi after the air attack on the Argentine-held airfields...

C

Rf output from the final amplifier is positive, CR3 is reverse-biased so little signal makes it to the mixer input transformer When the ri output from the final is negative-going, CR3 is forward-biased so the rf signal appears at R25. However, CR4 is now reverse-biased, blocking the rf output from reaching the mixer input The use of this type of diode switch eliminates the need for a mechanical relay Purists would probably add some rt chokes in series with the biasing resistors

Call Or Write For Complete Details

Available tor remote site linking crossband & 10M. SENSITIVITY SECOND TO NONE TYPICALLY CU5 ljV ON VHFr 0.2 uV ON UHF. SELECTIVITY THAT CANT BE BEAT BOTH 8 POLE CRYSTAL FILTER & CERAMIC FILTER FOR GREATER THAN 100 dB AT 1 2KHZ. HELICAL RESONATOR FRONT ENDS. SEE R144, R22G, AND R451 SPECS IN RECEIVER AD BELOW. OTHER GREAT RECEIVER FEATURES FLUTTER-PROOF SQUELCH, AFC TO COMPENSATE FOR OFF-FREQ TRANSMITTERS, SEPARATE LOCAL SPEAKER AMPLIFIER & CONTROL. CLEAN, EASY-TUNE TRANSMITTER UP TO 20...

Call Toll Free

Calf 601-323-5669 in Miss Outside continental USA, tech order repair info Tetex 53-4590. V Bott 494, Mississippi Stale, MS 39762 this is a widely-marketed ptece If e uip-ment which has received good reviews Problems such as you describe can t> traced to Anything Arom an integrated circuit inStalled backwards (lhat is. 100 degrees out of phase don i leil me can t happen, i ve done Itr) to a sotde* bridge trttween two prmied circuit iracmgs dtttoD The critical thing about thlfl is thai if...

Capacitors

1,5 uF 5V 3 1 00 1,B uF 2 V 3 S1.00 22 uF 25V 3.-S1.00 11 -I I tflV Athji f IVM 10 .i' 1& V .1014 to 1 Make high resolution audio measufrn nrs. great for musical instrument tuning, PL tones etc Multiplies audio UP rn frequency seiectiiOie *to or 100 gives 01 HZ resolution i sec gaie time1 Htgh sensiii r v Of 25 mv T meg < npui z and built-in filtering givei gr at pertoimLince Rus on & V battery all CMOS PSkit 129-95 Extend iho range ol your counter to 600 MM Works with all counters Less...

Catalog Of Ha R D To Find Precision Tools

Also contains test equipment plus wide selection of tool kits a nd cases Jffi& ffTs nriA catalog is jiim-packed with motr thrtn 2000 quality Your single MiLirre inr hrtrd-io-find precision tools and riJ Lits used by eleciroriiL technicians. Mit'ttiiMv engineers. instrumrnt mc han-u s. si h.mis. fa bora tor it s iiml government aqi-nties Send fur our frrt copy today 4kTtl Tt t r l*X> Ni* A SQJ< J

Cicc

10816 Narthridge Square Cupertino, CA 95014 (408)253 8085 false alarms, then any pair can be used simply by designing simple multivibrator oscillators driving speakers and holding them against the microphone of a transmitter. Only authorized personnel would be issued coders. The first prototype was built using perfboard and placed in continuous operation in the spring of 1980. As of this writing it has never falsed yet and continues to respond when needed upon adequate application (several...

Clb Electronics

See LH Of Atlvpttrsers on n Frank R. Fortune N6BW 2351 Nina Street Pasadena CA 91107 There used to be two styles of prototypes cramped. Now there is a third style There are at least a dozen different boards on the market intended for prototyping and one-of-a-kind construction projects. Most that I have used in my ham activities, in the classes at Los Angeles Access, and professionally have either been lacking in flexibility and ease of construction or are difficult to circuit trace- Of the...

Communications

OA 92667 800 854-0547 California 714 998-3021 This Uttle Beauty is the first of our compact, low profile tmplifiers for use with handheld radios. For VHF operations, ttiis unit produces 10W to 25W output With dnve from your H5W to 3W handheld. Excellent for mobfle use in your car. Turn ft on wrrh the convenient front panel controls, including Power LED and Transmit LED, or slip the package under the seat out of sight and out of mind. Low insertion oss on recede and...

Compare These Features With Any Unit At Any Price

FREQUENCY RANGE Receive and transmit 28,000 to 29.995 MH IOKHz steps with built-in - 100 KHz repeater offset. ALL SOLID STATE CMOS PI DIGITAL SYNTHESIZED, SIZE UNBELIEVABLE ONLY 6 3M x 2 3 0 x 9 3MXOMPARE MICROCOMPUTER CONTROLLED All scanning and frequency-control functions are performed by microcomputer. DETACHABLE HEAD The control head may be separated from the radio for use in limited spaces and for security purposes. SIX-CHANNEL MEMORY Each memory is re-programmable. Memory is retained...

Contacto

An ultra sophisticated yet simple to operate RTTY System for the demanding operator at an affordable price. UO SAVE, LOAD, KILL * DIR TR .SPLIT scre*n, us r defined 10 CANNED MESSAGES DYNAMIC BUFFER ALLOCATION Live HARDCOPY tor parallel prlntors Keyboard CONTROL of STATION . ALiTO ID RTTY, CW Mleclafrle ON OFF) CLOCKED OUTPUT rale . r All BAUDOT speeds plus ASCII (110) NAME, 0ATE, TIME from computer On Bcrwn SIT PATTERN SCOPE Kegu res TRS G M0D-W wit* your SlGK 0i K tfO VEftSiOH 279.00 CASSETTE...

Counter Preamp

For measuring ci irmr wcat sipul 10 tu 1.000 MHr Small m po etedbr plug rranaiormct-included Great foi nJ ing RF with pick-up k p JJ_H Satiifott.on gvo-onltvii hx 10 4o-f i a* r pi y n h a- o1 lo 'on r lijnrj Add ih rm n g inHfWC In 0 m Li * I fn U Ti Q iO OvfriiO) adrfl COO 13 0'4m,i und*J 1 1 D od ' MT eindin.fi. ndd Ids

Cq Products

C itf tqvtpment no ncfat edt Weighi of table is 2S bs. Others claim more gain for their antennas than lsoPole1M antennas, but can beat the isoPole for HONEST on-t he-horizon omnidirectional gain unless you are wilting to spend at least THREE TIMES AS MUCH The IsoPole is easiest of ALL competitive models to assemble, has a weather protected, factory-tuned matching network, (no more aggravating SWR varia* tions with weather changes), uses all stainless steel hardware, and is designed to...

Ctw

TAPES lANV .J'JH ABOVE , 1 i S i' inh COHi'PUETt SHORTWAVE LlST N fl'S HAN BOOH < . rME CONTEST COOW l H & 5 lIt r-- f. L.hU t JTEP M V. . I ftl i . .pI'TM,HG OU UWtEh l N ABOJl iVAT ufi TV tf A OUIOE TO Hi AA LJ * VJ MO * coM rt' s AH HEA t J MOW TO DtftHt) tOUftSElF AGAlHST (UOAP tt,l.UBAU& lOA OOU V* - , WAOlC Of HAW AUlO i W Ni Ni .V r+OBE I MPUttHS i ,. 47 iHl Ni W WEATHFfl L L1T F. irtt K r.,t --HAt cal ANDOF M f tPtAltHS f VB2 yFtOl .A lAMrbJC- OVW 5D OSI flH ffi -STVLE rt rt t...

Dealers

Your company name and message can contain up to 25 words for as little as 150 yearly (prepaid), or 15 per mouth (prepaid qmrterly). No mention of mail-order business or area code permitted. Directory text and payment must reach lis 60 days tie advance oj publication. For example, advertising jor the March. *S3 issue must he in our hand by Jan. 1st. Mail to 73 Magazine, Peterborough NH 03458. TTN Nancy Ciainpa. J, H. Nelson 4 Plymouth Dr. Whiting NJ 08759

Element Multiple Choice

11 Tiie year 1982 witnessed one of the greater turnovers m Al RLUppeHevel personnel in guile some time By now, we all know lhat Vic Clark is the Leagues new president and Dave Sumner ihr m-w General Manager Whal. howrvM was Ihe fate ol filt hFird Baldwin, the old General Manager 1) The oh of ARRL International Affairs Vice President 3) The rob ol APRL TVl Task Force Chairmen A) No job 2 What as asi yea - bk) news Irom the Heath Company 1) Heath s withdrawal trow the ar ateur radio m nketplace...

Encon Photovoltaic Panels

Inc. dtsirfOutoTs of Soiare* photovoltaic products or tne M (tweet has in iroduced the now Solarex SX series ot semt crystal line photovoltaic panprs, using state-of-the-art technology SoJarex semi crystalline cells offer unique advantages over earlier lechncl* ogy> including lower cost, increased packing efficiency and higher power out out compared with -he traditional round Sin - ,r-Ja Si i . * - Seoticrysta - r a*e made b, melting les saltan -pure poly cry staff ine silicon...

Fghz

Ft Gain Bandwidth Product at Vce 8v, Ic 10ma. GHz 4 Min. 6 Typ. Vcbo 25v Vceo llv Vebo 3v Ic 50ma. Pt. 250mw UNELCO RF Power and Linear Arplifier Capacitors These are the famous capacitors used by ali the RF Power and Linear AttpI i fier manufacturers, and described in the RF Data Book. 200pf 1 to 220pf 11 to 470pf 51 up 500pf lOOOpf

Fl

> 6 Hi O Resonalots with Lo-Noise Transistor Ampi M or 220 MHj Provrdai IramandfHJi reaction at oMl-of Oand Signals Ht oul the usual loss1 otien b u *jrj ffisleaa Idfij expensive r.jvily filters Ejtiremi.'iv neiplui at sues wiin i any nearby Hf m jnsmif ersto filler oui these out ol.-band Mqnsi< . Compete solid siaie control for rptr COR Hang Timei, HTime-Out r Time IX SnuioowrvRese etc Includes Inputs & Oulpuls for pane* conlrols & lamps tiapaaler Ton A Control Bds-For SCR 1000 4000...

Foo

Receive mode, R25 supplies current to CR3-R24 and CR4-R26 from +R.CR3 and CR4 are forward-biased with about r> mA dc and appear to small rt signals from t he antenna is 25-Ohm resistors Receiver signals thus easily c an pass through C28 and C29, which are dc blocking capac itors. and the two forward-biased diodes to the input transformer of the mixer. When the bias to the diodes is removed in the trans mil mode, I he diode switch opens Notice that when the

For Radio Amateurs

Daisy wheel quality without daisy wheel I expense. 1 You need the quality print that a daisy wheel printer provides but the thought of buying one makes your wallet wilt. Seiecmc Interfacet a step-by-step guide to interfacing an IBM Selearic I O Writer to your microcomputer win give vqu that quality ac a fraction of the price* George Young, co-author oi Xhcr computing magazine's popular 1 Kilobaud (Classroom1' series, offers a low-cost alternative to buying a daisy wheel printer, Sekctrk...

For The Contester

THE CONTEST COOK BOOK-This booh reveals me secrets of that elite group of operators wt top the h si when the contest resuils arc published II contains detailed suggestions for the 1 irsl time contester as well as tips for the advance operator. Domestic, DX, and specially contests are all discussed, complete with photographs and diagrams showing the equipment and operating aids used by the top scorers. For the serious contester BK7308 5,96._ t

Fox Tango Corporation

Box 15944S, W Palm Beach, FL 33406 Phone (305) 683-9587 32 73 Magazine does not Keep subscription records on the premises, ihere-fore calling us only adds time and doesn't solve the problem Please send a description of the problem and your most recent address label to 73 Magazine Subscription Dept. PO Bo* 931 Thank you and < fQut * ubscnphon

Free

Brand New Catalog With Over 150 Programs Instant Softwares new catalog is free and it offers 150 of the finest programs you can find. At reasonable prices, and a variety you've never seen before in one catalog. And they're all contained in the new 16 page 1983 Instant Software catalog. You'll find ASSEM ZSIM 2 great utilities in one super package. Assembly language programmers, this package solves all your programming problems from ASS EM to ZSlM, Super Utility Plus the most powerful program of...

Frequency

Effect of increasing the Q of an antenna system, a) The antenna system has essentially no selectivity, The signal, at frequency f0, is buned in the noise, (b) A selective circuit is used in the antenna systemi The total amount of noise (area under the curve) is sma er and this results in fewer high-order mixing products> which actually reduces the noise level at i0 But the signal level remains unchanged, improv ing fhe signal-to-noise ratio.

Fully Assembled And Tested Wb

HAL PA1.4 WIDE BAND PRE AMPLIFIER, 10 MHz TO 1 4GHjl 2dB GAIN CLOCK KIT-HAL ra FOUR DtGiT SPECiAL-17 OP RATES ON 12 VOLT AC fNOT SUPPLIED PROVISIONS FOR DC AND ALARM OPERATION COMPLETE KIT CONSISTING OF 2 PC G-1Q PRE DRILLED FC BOARDS. 1 CLOCK CHIP, 6 FND COMM. CATH READOUTS, 13TRANS 3CAPS, 9 RESISTORS. 5 DiODES. 3 PUSHBUTTON SWITCHES AND INSTRUCTIONS. DONT SE FOOLED BY PARTIAL KITS WHERE YOU HAVE TO 8UY EVERYTHING EXTRA WILL RUN OFF ANY 12-VOLT AC SUPPLY. PRICED AT *12.95 CLOCK CASE AVAILABLE...

General Electric Aa Nicads

Pack of 6 for 5 00 or 60 Cells. 10 Packs for 545 00 These may 0e droken down to individual ceils OfUKlUNQ S'H CTlOhS DEFECTIVE MATEBlAL Jt i.iri t - '.i Z - .it Si * T ti. 2a r tfrv r fl of Aft C** r* muf 1 ndu ttft rnatenaJ 'tsrtlttrftgpwWWi. & vr .nrtnee u M* J-diM OA'S e.-i - .1' E-e O* ' * < d * - -tiffi if i'fir z' i ' 3li Ournormsi stopping meinoa it * Pi* I C uiWi or U*S depend DO Sitt tftd weight t W O* Ittt it n by Alf gnif FOB vi-i> ir,C DO' l FOREIGN ORDfftS All *or *gn onJen...

General License Study Guide

Daniel N8RK This is the complete guide to the General License. Learning rather than memorizing is the secret. This is not a question-and-answer guide that will gather dust when the FCC issues a new test. Instead, this book will be a helpful reference, useful long after a ham upgrades to General, Includes up-to-date FCC rules and an application form. Order yours today and talk to the world. SG7358 6.95

Glasgow Ky

The Glasgow Swaplesi will be held on Saturday February 26 1983. beginning at 8 00 am Central time, at the Glasgow Ffea Market BuikJmg 2 m-u-s south of Glasgow just off tughway 3lE. Glasgow V AdmFS Eton is S2 00 per person There is no adoi honai charge for exhibitors. The first labr -per exhibitor will be free, and exlra tables win be available for S3.00 each There will be a large heated building, Ifoj pajfcing free coffee, and a large tfea market- Talk m on 146 34 94 or 147.63 -03 Fof iurther...

Groundhog

Tne Punxsuttiwney Pennsylvania Amateur Radio Club will operate on 14 290 and 7.230 from 9 am to 5 pm. January 30, 1983, in commemoration of Groundhog Day I9 3. We Will operate I30 on 7 230 or February 2. 19B3 . Groundhog Day) Thi-i special-event station will operate from Gobblers Knob, the nome ot the Ground hog Certihcaie tor SASE and QSL card to An Sweeney K3HWJ, RD 1, Bex 371. Punxsutawney PA 1& 767 speotai-evenis operation in honor ol the State of Georgia's and historical Savannah's...

Hand Books For The Hamshack

THE COMPLETE SHORTWAVE USTENER1S HANfr BOOK, 2nd EDITION by Hank Bennett an Harry L Heirrfi This comprehensive volume contains loads of new information from all over the world on the l& tHst development a In SWL technology clubs. associations, practices and stations A thorough guide to stations ol the world by general continental area end frequency ip included BKT24149 95 THE TEN METER FM HANDBOOK by Bob Heif K9EtO. This handbook has been published to help the ten meter enthusiast iea*r more...

Have All Pl Tones Available At Your Finger Tips

Being rated between 0.25 and 5 Watts dissipation without a heat sink, usually are classified as small or intermediate power devices. An example is the 2N6034 Darlington used in the above examples Both and c are specified for these devices. lastly, a device may be classified for use only with a heat sink. These are the high-power devices, such as the 2N3055. The data manuals commonly provide only the data required to determine the heat-sink requirements. Values of thermal resistance for heat...

Heard Update

Onoof the most difficuH and expensive DXpeoihons coni'nues it > re omtess drive towards ihis isolated rock iaee this column. September. 1932 . as the members of The VK6 DX Chasers Club na> i down many of the details of the hip. At the Sami- time that the VK6 DX Chasers are organizing iheir trip lo Heard, ihe well-known Soulh Pacilic DXnr, Jim Smith VK9NS, lies chartered his own irans-portailon to Heard, Jim sport3 an impressive record of successful...

Hi A

Tuin Oaks Associates is partnership of mental health professionals who an1 hams inter este d in helping others to learn CW, Twin Oaks has de* veloped three Morse code leaching systems on tape which represent the careful applira* tion of psychological princi* pies o learning. They help students learn to recognise and copy Morse characters at a very high speed. The first set of tapes is called 5 stem 121 .It is designed for I he ham who ma> hat e a Novice or Technician class license but can*...

High Performance Preselectorpreamp

The solution to most interference, intermod, and desense problems in AMATEUR and COMMERCIAL systems. 40 lo 1000 Mhz - tuned to your frequency & large helical resonalors Low noise - High overload resistance 8 clB gain - ultimate rejection 80 r.R 10 to 15 vaits DC operaiion Stze 1 e x 2.6 x 4.75 exc connectors Price - S69 95 bipolar w RCA jacks Connecior options. B JC UHF 6. Typical reject ion 600 Knzitt'144 mi - 28dB 1,6 Mhz 220 Mhz -40dB 5 Khz 450 Mhz -50dB Typical reject ion 600 Knzitt'144...

I I I I I I I

Kantronics Training Tapes, Books, and Diskettes Designea wilh an instructive interview slyle format. Kantronics Study T pe4* art greai supportive theory material for the latest exams . New Novice Study Tape- 6.95 I I New General Study Tape Set-(two) General Q & A Tape-Qut'Si ons stmt-lar to those on the FCC exam with good possible answers by Extra-class John Lenahan. K0RW 6 95 j Advanced Study Tapes-(iwo) SI 1 95 Extra Study Tape- 6 95 _ Break the 13 WPM Barrier-by Pfvl Anci rson W0XI Hints...

Tnv

Combines enhanced code with gradual increases in speed for easier copying Transcript of ihe QSOs and exam included with each tape i i Novice Super QSO Gradient- to 9 WPM b 95 I High Speed Super QSO Gradient- Simulated 'on the air1 conversaltons de signed lot the current style FCC tesN Tape transcripts and fill-in the-blank exams included QSO Tape-7 5, 10. 13 and 15 WPM 5.95 QSO-2 Tape-another hour of QSOs ai 7 5. 10. 13 and 15 WPM 5 95 E QSO-13 Tape-all 13 WPM 5 95 K sntronics Super tapes...

Oet

MW( SWT & FM Bands Instant Fingertip Tuning No More Knobs 4 6 Memories tor Any Mode AM.SSB CW, & FM) Dual PLL Frequency Synthesized No Drift A WHOLE NEW BREED OF RADIO IS HERE NOW No Other Shon Atave receiver combines sc ma ad-.anced features for both opiating convenience h gh performance as does the new Sony ICF2001 Once you have operated this exci mg ne.v radio, youll be spoiled forever Direct access tuning eliminates conventional tuning knobs and dials wilh...

Rub

And might use PIN diodes however, I'm not a purist just cheap The receiver mixer employs the often-used 4067 i (Qtt) whic h is adequate for this application We now come to the second diode swiU h in ihe mim'ceiver, wliii ii is used to swiU h signals to the c rystal I ilter from either the receiver mixer or the d(Kihle balanced modulator ( Kr> forms half Ihe switch CR8(Kig. 6) forms the other half When +R is onH CR5 is conducting about 6 mA dc, again providing a low-loss path to small rt sig...

Icow

General coverage xcvp 730Xtvr 740 Kcvr 251A2 Mt-'i All Mode 5056 Mei r Xicvt 2 Melei Mtn vet.- Ml Vode V i 220 MH Mot 140 '.HI v jt e , j. iiT ia T Ha neuis inTerlace Mint ddJf r Pk Mini Terminal MPJ 941C Tuner 496 SUPET K'-y I.HJlird ji j VHP for 2M HTs 104 Ne* hi Duj- Cl& ck Large Assorimenj MIRAGE BlOlfi 8301

In Stock

VISA or MASTERCARD for same day shipment, For 69.95 you get the most efficient, dependable, fully guaranteed 35W 2 meter amp kit tor your handy talkie money can buy. Now you can save your batteries by operating your H.T. on low power and still get out like a mobile rig. The model 335A produces 35 watts out with an input of 3 watts, and 15 watts out with only 1 watt in. Compatible with IC-2AT. TR-2400, Yaesu. Wilson & Tempo1 Other 2 meter models are available with outputs of 25W and 75W, in...

Incorporated

MS 39762 Jhv front side at the Merheny enclosure. next to the Speaker case usual options for each tone Wnh one boartJ you c& rt even use sequential single tones with a delay In ihts case, a single pol would establish the delay so that, in elleci, tne device will require lhat you input both tone& within two seconds ot or whatevei period you program Us ing muliiple boards. you could do She same thing, bui inriih variable delays be iween sei- cteo digits io...