Info

TL0S1 P-channet SiFiiTop imp TU)91 N channel NFET op mp LF353 duai BiFET op amp 4066 bilateral switch LM339 quad comparator 2N3904NPN iiansisioforequivaleni 2 3906 PN P transistor or equrvaten 1N914 siiicon diode 1 5V Zener diode 50 microhm meter 5*0 PC board Tfimmerpot lOkO PC boa d trimmer pot 10kG, 10 turn trimmer pot 20kG PC board trimmer pot 10OVTl PC board Trimmer poi 22 0.3W resistor 100 O, WW resistor 220 Q, WW resistor 1 5kfl. WW resistor 3 3kOr V-.W sistor 7 5kO, Vj W resssior lOkQ,...

If You Buy An

Absolutely no tuning with a MAXCOM system Simply connect. < Jiat your frequency arrtf tat* , OVER SO 0 0 MAXCOM STATIONS WORLD WIDE BOX 502, FT. LAUD-. FL 33302 3OB-Q87-617B KAXCOH I* registered tEidcutrk and 1* oaned by Matean tlactionlca, THE BOTTOM LINEi MAXCOM WOflKB DRSI's PC-Packet Adapter plugs right into your IBWh PC XT AT or compatible. One port connects to your VHF rig and gets you on the air In minutes. Our one-page Quick Start Guide takes II you through it step by step....

The All New Private Patch Iv By Csi Has More Communications Power Than Ever Before

Initiate phone calls from your HT or mobile Receive incoming phone calls pj W * Telephone initiated control Operate your base station with complete control from any telephone Change frequencies from the controlling telephone Selectively call mobiles using regenerated DTMF from any telephone Eavesdrop the channel from any telephone Use as a wire remote using ordinary dial up lines and a speaker phone as a control head. The new telephone initiated control capabilities are awesome. Imagine having...

Usa

* Covers 100 MHz 'o 199 999 MHi in i steps *iin thumbwheel dial * Accuracy *t- 1 part pe* 10 million at all frequencies internal FW adjustable from 0 to 100 kHz at a 1 kHz rate * External FM input ac* cepis tones or voJce * Spurs and noise at least 60 dB below carrier Output adjustable from S500 mV ai 50 Otims * Operates on 12 Vdc Vi Amp * Available for immediate delivery S429& 5 delivered * Atftf-on accessories available lo extend treq range, add infinite resolution, AML and a precision 120...

Dealer Directory

New HAM store open and ready to make a DliAL. Wc carry al lines, ship UPS, and ire open Sunday. A-TECH ELECTRONICS, 1033 Hollvwood Way, Burhank CA 91505 0*18)845-9203. Hard to find pans, surplus electroftfcs, standard 1 inLT items. Hams, hobbyists, industrial professionals from nuts & bolls to laser diodes, Electronically speaking Gateway's got it M F 9 5 30 S t. 9 5 GATEWAY ELEX -IRONICS, 4633 Convoy St., San Diego CA 921t1 (> 19)279-6802.

Prices Do Mot Include Shipping Prices Subject To Change Usa Mastercard Ado Ups C O D Add Per Order

12 Volt C64, Vjc20 nn ob i I export able power supplies Take your computer on Field Day, Vacation. Anywhere 12 V pwr supply 42.95 AcW S6 postages ndiing Everything you need to gel on packel with your Commodore. Includes D gicom-64, Public Domain TNC emulator disk and ail parts to build packet modem, VHP kit 29 95 95 Los Alamos, NM 87544 (505) 672-9742 1 4 WAVE MAG. MOUNT ANTENNAS ONLY 13.00 Complete with strong chrome plated maganet & RG58 coax a PL259 ta ins tailed ORDER* M300 tor 2 Meters...

V

Im rfsnng 1 n m ihe untar Of Jmred iqnil 1) CW Variable flandwirith Tuning. Vary fie pa shand width contfnuDusly in the CW, FSK. and AM modes, without aflecting Ihe center trequ& nty This ellectivefy minimis GftM from nearby SSB and CW signals 2) AF lime.Enabled wilh the push of a Sutton, this CW mierfeffnce ligMer inserts a tun- Die three pole cTisfe Mterhetween theSSB-1 CVidemodul.'ditor and the audio amplifier During CW QSGs. this cannol can be used to reduce interfering signals and nmse....

Circle On Reader Service Card

Vol Fire, - UJto F unci on LCD ti p a y EAfT,B'casi RPU,Police, etc -FrequencyRanga 36-174or f uliy ReW Programmait 0- 512 wHi -99 Channels - f CC 4 DOC type accept * True 40 Wafi Pow r - Low Coal DTMF mite avail * Eitremety Hugged * Ovfcmigtit Sapping Avatebto Su peed Crte Mobile Sttfe Wou & Base Siatioti P,S H moWe Antennas etc. in Slock AXM Incorporated 11791 LoaraNt* Garden Grove, CA 92640-2321 rtn pfCaH7 30 8 7torimrwdiaw niofmatjon

Glb Netlink Highspeed Data Transceiver

Efceinjnics t- pleased to mnatmi . 4 'asi jigw- - d> g4ari-ci4 date iatjit miendtod iDiumv* iin- deretopnert gt Ihe . nationai arr.gie i pac si Mfc& nfc radios at* imended a use m iwute, unattended appfeahont tor long term service t - ptftitite * iH-j rnf*ai youni .aninf rt itg e to ifansmn- n w t a TAsecond tnrsj*n(s ifte cfVi--- A afc irKfe trawled j nafe * & eQue Cj 10 m*nt* n 10-* mr ra s hong perads o* fccr* ir adcMon. n*> ui*j* crysltfi and ifrhpwjiufr ompr Hie a cireufcy fv p...

Helical Resonator Preamps

Low noise preamps with helical resonators reduce Intermod & cross-fcand interference in enseal applications, MODEL HRA-**), 49 vhf, 84 uhf. Specify tuning r nge desired 143-150, +f 50 158, 158-162. 162-174, 213-233, 420 450, 150 465. or465-475 MHz Send 1 for 36 page catalog by return mail. (Send 2.00 or 4 IRC's for overseas mailing) Order by phone or mail Min 3 S & H per order Use Visa, Mastercard, Check, or UPS COD. 6 5-J MOUL ROAD'HIL TON NY 14468-9535 Phone 716-392-9430 ( mw

This HT

Full-featured Hand-held Transceivers Kenwood brings you the greatest hand-held transceiver ever More than just big rig performancef the new TH-215A for 2 m,TH-315A for 220 MHz, and TH-415A for 70 cm pack the most features and the best performance in a handy size. And our full line of accessories will let you go from hamshack to portable to mobile with the greatest of ease Wide receiver frequency range. Receives from 141-163 MHz. Includes me weather channels' Transmit from 144 148 MHz....

Radio School

2 code topes 1 1 poge book U oricl maps frequency charts Course certific te free magazine coupon 50 piece literature set S7D in equipment certrFicotes from COM K NUJOOD ondVA SU S19. 5 4 code topes 2 theory tc-pes 2 test books code oscillotor set. eionuner test pocket orxd J70 discount coupons novicc tcxtbook 4.95 UUmten by Gordon litest this 12 poge lX> oH I contains oil Novice questions cmxj o vsujers 6 tope stereo code course for learmag the I code from scrotch Includes certificates t chwa...

Itt Push Button

ITTMDPL sen W X MT nray rectangular key cao S P S T W.O. Push 10 Close RATED 0 lamp carry current P C, mount CAT* PB-8 G5c each 10for s.a0 * 100 for 50.00 LOS ANGELES DOS 3r VEHMOST AVE LOS ANGELES, CA 0006 2 1 * 3 a D-6QQ 0 VAN NUTS 2B SEPULVE A aLVE> , VAN NUVSi CA 1411 40 1a) B '1 & U1 CONTROL R 15 5tD OVdc uperata on 3-32 Vdc) LOAD 10 Amp & 2AQ Vac 2 1 4* X 1 X 7 W CAT* SSHLY-IOB 9 50 eacti 10 lor e 50 each QUANTITY DISCOUNT 35 lor 7 00 each 50 lor S6 00 each 100 for 5 00 each

Vigroplex

Joseph J Fairclough 48,57 yagi * *. ____ _____ _____ ,. 16,68. 87 iZflfenfif - . 11 j i 27 W3GXK is NOT the QSL man* agerfor FP W2NSD. Please send air FP W2NSD QSLs io WGE Center, Route 202 North, Peterborough NH 03458. The RTTY Loop Program pub-tished in the January 1908 issue of 73 has some mistakes. In order for the program to run, there must be an after the word PRINT on six tines. On the line that begins with '310, place an t after each PRINT The other...

Printer Port

Compatible with Centronics -t> > t parallel qrinter At teas' 4K byte data buffer is required in a primer. BACK TO BASICS - - But far more advanced-- The AR-5Q1, triple mode CW terminal in a small package, is a powerful gear to practice and play with, For the Novice, SWL and Amateur radio operators it detects Morse code between 5 to 30WPM, Just p ug the AR-501 to your receiver to start translating the Morse code onto full 32 character LCD display. Very simple and easy to operate. You ask for...

Electronics

Michigan481Q6-1CW5 USA For orders call 313-973-8680 or FAX 313-971 -6000 Wm M. Nye Co., Inc. 1614 130th Ave. NE Betlevue WA 9B005 Price Cfass 297. with coupler and charger Nye calls their new product a power monitor because of the variety of ways it looks at RF en route from the rig to the antenna (or back). This simple unit the RFM-003 sports only five controls is one of the more versatile RF monitoring devices on the market. In addition to SWR forward, and reverse...

Hur

To *JT Cidfir r 77 MjfiUiK, ViQ t Cfflin Piicit h SH i> ii * Ailr. Irife Wayw , Manage your radio's memory channels from a IX Control your radio s functions from the PC's keyboard Available NOW lor Kenwood TS-440S, TS-940S and IBM PC, AT, or compatible, inquire for other radio PC combinations. 7958 Umewood Court Pleosanton. CA 94566 (415) 462-4609

N

Models also available without GaAs FE preamp (delete G suffix on moaej > , Ai> . unris cover full amateur par*d - specify TO MHi bandwidth for 420*450 MHz amplifier. Models also available without GaAs FE preamp (delete G suffix on moaej > , Ai> . unris cover full amateur par*d - specify TO MHi bandwidth for 420*450 MHz amplifier. Amplifier capabilities 100-500 MHz 225-400 MHz, 1-2 GHzr Military Commercial, etcr aJso available - consult factory.

S J

4 R DEf LECT D UPVAff B K 9AH.00 almost always are elopers,4' not verticals. Therefore, for low-angle directional propagation. lengths greater than wavelength become quite practical and useful To date 1 have flown lengths up to 830 feet (253 meters), representing about 1.6 wavelengths at 1.810 MHz. The components for the basic balloon antenna cost under 100, I left out the costs of the antenna tuner a fundamental component for a system like this-and the ground radia system, which you should...

No

DM4061 Dip Meter every ham needs one DM4061 Dip Meter every ham needs one A must tor every h rit shack check coils, tint circuit , anttnnm, tise ti RF Generator . iht rnfel jncKiu a(ionH look for buumofu I 5 - 25 MHi. 6 p-Sup- n coils, only 79-95 + S& H A must tor every h rit shack check coils, tint circuit , anttnnm, tise ti RF Generator . iht rnfel jncKiu a(ionH look for buumofu I 5 - 25 MHi. 6 p-Sup- n coils, only 79-95 + S& H Measures outpuc SWE, whik on Ehe air 10 & 100 watt...

Jcar Hillbilly

Call or Send 2 00 for Complete Catalog and Pricing of AntennasDEALER INQUIRIES, PLEASE CALL - Covers 27-54 MHt 108 L74 MHz, 4C6SL2MH dJid 900-950 MHi - 5 Scan Banis v.c 5 Search Bar TatFrtigr 3 Day SaTUbctDfl OWTMl Ln r i Skppnq Of .t- - f-yji ft e iri l J rid Salaried. COMMUNICATIONS 10707 E. I06th Sr Indpln,, IN 46256 Visa ar d MasterCard (COD slightly higher In Indi a3J7 8 -2570Collect rWi 3 7 819-3754

Get Your Bearings Straight

At (asti A map dedicated to the radio amateur. Announcing the Azimuth-Equidistant wall map tram Uhe Great Circle Map Co. An azimuth map provides information about heading and range to any place on Earth. Ho longer w you hav-to guess at *htch way to aim your beam antenna for that rare DX. Each map is specially drawn wiih your station at the exact center fbe rest of the worfd is spread out around you. To use the map, simpty find the target station and read the compass heading from the border of...

Construction Notes

Figure I shows a functional block diagram of the transmitter and receiver as separate circuits, and the simple connection between them to form a transceiver The receiver schematic is divided into two separate drawings, Figures 2 and 3. Points A and B are direct connections be-tw een the tuo receiver schematics. Figure 4 is ihe transmitter s schematic diagram, When buili as a transceiver, a DPDT switch lakes care of the transmit receive switching. 1 put this switch on the rear of rig up high...

Mfj

MFJ's innovative new Differential-T Tunerrr* uses a differentia capacitor thai makes tuning foolproof and easier than ever. It ends constant re-tuning with broadband coverage and gives you minimum SWR at only one setting. The new MFJ-986 is a rugged no-compromise 3 KW PEP Roller Inductor antenna mner thai covers 1.8-30 MHx continuously, Including MARS and all the U ARC bands. The roller inductor lets you tune your SWR down to the absolute minimum - something a tapped inductor tuner just can't...

Motron Electronics

The MoTron Auto-Kali HF-Atert is a caliingtalerting system designed for use with HF SSB CW. It will also work on VHF UHF, FM AM. CB, and marine HF VHF. 225 code combinations are possible. The HF-Alert allows the user to be contacted by radio without his having to constantly monitor the bands. The HF-AJert comes with mobile mounting bracket, 117 VAC power supply for base operation, and an audio patch-cord, tt ts easily set up by connecting the patch-cord from the radio's external jack to the...

ICOM

CW w ps 1399.00 1099 IC 475H 75W 440 FM SSB CW 1599.00 1289 IC-575A 25W 6 10m xcvr w ps 1399 00 1249 IC 471H 75m 430-450 Closeo l 1399.00 989 PS-35 Internal power supply 219.00 199 AG-35 Mast mounted preamp 99.95 AG-35 (Purchased with IC-471H) 99 95 9 SM-6 Desk EX-310 Voie TS-32 CommSpec encode decoder, 59 95 UT-15 Encoder decoder interface. 34 00 UT-15S UT-15S w TS-32 installed 96.00 VHF UHF 1,2 GHz Mobiles Regular SALE IC-37A 25w 220 fM TTPmic Closeout 49900 349 IC-47A...

All Bandlimited Space Antenna

Ensn - irt '< 0 nJK WTiir4 s - Fertea maten lar fouf Art TiflH mm t4 nc 0 une output Itort s. ''ii i mer -i ' i tare w PwiBCtor AU-dusaoTAnuteui * irs as Ftii-ipp Saper. hmw T, 0 tfHofit x*f (sn gvaiHri - Shcrtsnnn piDwJe lui 13 W teancfr ingr TQ ta - CpniMWt f Jdofy aii yed ftM to fwtf W usmenn neertsatry ' U i JK NUfy Cop *rG*f iCoppuiVffite mbrra wt, 130 OCpCW' rtte1'- iPeriflfr MO niai. Wui not snth i< *h ajpt .-- ooei ASi J4955 fU S Posiai DELUXE CENTER CONNECTOR * NO Jumpet Wire*...

Qrz Industries

QRZ Industries introduces the Voice Box and the Mini Vofce Box kits, especially designed for DX-ers and contested The Voice Box digitizes and stores an operator's natural voice, which can then be recalled. A total of 8 different phrases and operator voices can be recorded for up to 32 seconds. The Voice Box uses a 32 kHz sampling rate and several filters, it keys the PTT tine to the transmitter or transceiver during playback and allows normal VOX operation. It has a switchable built-in micro*...

Kh

Licence notes Four licence classes. 1st class all bands, 200W, 2nd class all bands, 4QW. 3rd class 1.8, 3.5T 5, 7, 14. 28 MHz and VHF. 10W. 4th class 1 ,8 MHz, 5W, Foreign amateur operation Apply to RSF. National society Radio Sport Federation of USSR. Box 08. Moscow 0-362. Our correspondent. UA9MA, is from the Yaraslov Oblast, number 168-Ed+ The amended, updated, draft Universal Permit Application form promised for September will now appear next month, providing that USSR material (or...

American Reliance

American Reliance announces ihetr new Telecom Test Set, the AR-18QT It measures level, nojse, AC and DC voltage, DC current, and resistance. The unit will also generate four precision tones for frequency response measurements. For the AC voltage and level measurements, a true RMS AC converter is used For noise measurements, the unit incorporates a built-in C-Message noise-weighing filter. The AR-180T is switchabie between either 600ft terminated or bridge measurements at an impedance of 1...

Radcom

Rad-Com's Soft-Control software ets the user control the radio remotely from a PC keyboard via serial link. Using Soft-Control's simple menu, maintains the radio's memory channels, and add, delete, edit, save, and restore data from disk. Soft-Control *s available now for the Kenwood TS-440S and IBM PC or compatible. Other versions wilt be available soon. Price, 59.95. Rad-Comr 7958 Limewood, Pleasanton CA 94566. 415 462-4609. For more information circle Reader Service number 203.

Uniden

Uniden Corporation of America has purchased the consumer products line of Regency Electronics ina for 12,000,000. To celebrate this purchase, we're having our largest scanner sale in history Use the coupon in this ad for big savings. Hurry offer ends October 31, 1988. Get specia< sayngs on the scanners listed in this coupon This coupon must be included with your prepatd order Credit cards, personal checks and quan tity discounts are excluded from this otter Otter vatidonlyon prepaid or ders...

Spectrum Communications Corp

The Spectrum SCA100 150W VHFMOOW UHF High Power Amplifier can be used with any 10-40W transmitter, repeater, or base station It features massive, behind the pa net heatsinks, automatic Hi VSWR Shutdown Bypass Mode with 3x automatic reset circuit, and auto amp bypass in case of power failure or overheating. With tight RF shielding and heavy duty construction, this design includes new final transistors, which provide more stability. On 100W UHF the amplifier is avaHable for 420-450 MHz on 150W...

Circle On Reader Servfce Card

A compact 30 meter CW AM QRP transceiver Part I The one thing about amateur radio I've always liked best was the challenge of building my own equipment Here's a little 30 meter QRP transceiver that has certainly brought a lot of fun back into amateur radio i'or me lately, and I hope to share some of the fun with you My family goes camping nearly every weekend possible during the warmer Wisconsin months, and f thought that it would be great to have a portable rig to set up at the campsite. The...

Dfp

Morse Code - Baudot - ASCII - AMTOR - Packet - Facsimile - Navtex It s a lesson you learn very early in life. Many can be good, some may be better, but only one can be the best. The PK-232 is the best multi-mode data controller you can buy. The PK-232 should be listed in the amateur radio dictionary under the word Versatile. One data controller that can transmit and receive in si digital modes, and can be used with almost every computer or data terminal You can even monitor Navtex, ihe new...

Wyi Marketing

P.O, Box 565101 Dallas Texas 75356 TeL 817 548-9594 Something new in a high power, high quality, HF Linear amplifier The Advanced Radio Devices ARD 230 series represents a linear amplifiers. Utilizing microprocessor control, the 230 automatic operation. new generation in high power provides full HANDS OFF Full power is always available Completely automatic Microprocessor controlled tuning No time limit for QRO Full QSK LCD metering VSWR readout Microprocessor controlled protection Automatic...

L

Mike Stone WBQQCD P.O, Box H Lowden, IA 52255 In the real world, TV stations do occasionally go off iheair J Yes, there was no June ATV in 73 Magazine. hope a lot of you wrote to 73 to ask what happened. if you didn't, and if you would like to see this column continue, take pen in hand and write your comments to 73 Thanks. As we move toward fall, with summer DX openings falling behind us, we find August at the peak of Fast Scan UHF TV long range DXing. The Spec-Corn Journal and The USATVS...

Van

Frequency, Period, Totalize, Self Check with High-Stabilized Crystal Oven Oscillator, fl Digit LED Dlfr V660 60 M H z D u al Trace 949 V422 40MHz Dual Trace 699 V212 20MHz Dual Trace 379 Sine, Square, Triangle Pulse, Ramp, .2 to 2MHz Frequency .1 thru 10MHz Deerfield, IL 60015 312 459-9040 800-292-7711 ASK FOR CATALOG 15 Day Money Back Guarantee 2 Year Llinired Guarantee Add 5 for Postage J10 max IL Res,, 7 Tax Multimeter with Cop. and Tram, Tetter Chosen By Amateurs For Over 15 Years. Winner...

A L

h r finiiiF lf izir-.-. t. rjd - . - rrea yevr eqmpmc lt .ife and itc n Side all Ihe unightly itB h r finiiiF lf izir-.-. t. rjd - . - rrea yevr eqmpmc lt .ife and itc n Side all Ihe unightly itB NOVEX rack mounts are standard EIA 19 inch size aluminum panels and are optionally equipped with handler and or forward facing speakers. Now available far most 1CGM. KENWOOD, and YAESU radios and accessories. 5 fhS Mill il NF. Vk-nru. V S LftO lit rn.n' i 'r - gt WfalhiB tai 1C I 5 fhS Mill il NF....

Ask For A Free Full Line Catalog

8044 Keyer Board

Amateur Kledronic Supply Ham Radio Outlet Henry Radio Madison Klectroriics ECK Barry Electronics C-Cumm Missouri Radio QuemenL Electronics Texas Towers Ham Station 1614 130th Ave N.E. Bellevue, WA. 98005 TEL 206 454-4524 FAX 206 453-5704 Briefly speaking, in Federal English language, The United Stales of America to ail whom these presents shall come whereas, there has been presented to ihe Commissioner of Patents a petition praying for the grant of Letters Patent for an alleged new and useful...

Datak Corporation

Direct Etch from Datak allows the use to try different circuit layouts without changing the master an or refabricating. To make a circuit, patterns and donuts are first rubbed down with a ball point or spoon burnisher. Connecting traces are cut io length and transferred. The final circuit is spray or tank-etched in any stan dard etchant. The resist is removed by soaking the board in mineral spirits, then rubbing with a soft cloth. The DE-973 Direct Etch set has 69 sheets of plastic etch resist...