Drake

The MAGICOM* provides up to 6dB Increase in output with smooth, clean, non*distorted audio and more penetration for those pile ups Easy installation (No Set of (2) 6146 W tubes Plate rating 40W per tube GET MORE OBfVE FOR THOSE Ht POWER AMPLIFIERS * TS 520 52i IS QRO KIT 39,50 TS-S20 820S QRO K ET 39.50 10 OFF ON K IT ORDERS TOTALING 175 00 OR MORE

And Upgrade Quicker

NEW MFJ Random Code Senerator Keyer sends unlimited random code in random groups for practice. Never repeats same sequence. Tailor level to your ability. Vary speed 5 to 50 WPM. Vary spacing between characters. Speed Meter. Full Feature Keyer. Sends unlimited random code, Never repeats same sequence Tailor fa vat to your ability. Vary mpaad 5 50 WPM. Copy code faster and upgrade quicker. Now you can tailor the level of code practice to your exact needs Practice copyrng code anywhere and any...

Qvi

NOVICE STUDY GUIDE SG7357 Here is a completely new study guide and reference book for the potential ham. This is not a question answer memorization course. Electronic and radio fundamentals are presented and expEained in an easy4o-understand fashion, preparing the beginner for the Novice exam. Includes the latest FCC amateur regulations, as well as application forms. Easily the best path into the exciting world of ham radio 4.95,* GENERAL CLASS STUDY GUIDE SG7358 A complete theory course for...

Circuit

Hopping, and there were plenty of stations on the simplex frequency (29 6 MHz), too. I noticed that the combination of sometimes terrific 10-meter propagation and the QRM-and QRN-suppressing characteristics of FM was quite intriguing DX signals often sounded just as clean and quiet as locals. After hearing all this, I thought it would be nifly to talk to the boys on 29.6 as well as the local 2-meter gang via the crossband repeater link, (There are easier ways of getting on 2 meters, though ) I...

Info

Presents Most Advanced i< Computing Our portable Models 31 and 32 feature the same state-of-the-art technology that is incorporated in their Big Brother, the Model 30. Never again will you have to bother with SWR ''calibratecontrols and switches Signalcrafters' custom integrated circuit makes power and SWR measurement a handsoff operation by automatically computing SWR. The result is unparalleled accuracy and ease of operation. CUSTOM f( - Computes SWR from the level sensed on the...

A F Notch Filter

This happens often in the frenzy of a DX pileup. So I tried approaching the problem from the other end, trying many varied devices. Many were built, but I seldom produced a unit which would not materially disturb signal intelligence while overcoming QRN of various sorts. Eventually, I was able to work out circuitry that performed in the manner desired with a minimum of drawbacks. Fig, 1 is the circuit which has proved adequate. 73 Magazine printed my first...

Electronics Book Club

Please open my Trial Membership in ELECTRONICS BOOK CLUB and send my 5-volume Computer Library, invoicing me for only 51 99 plus shipping, ff not delighted, I may return the boohs within 10 days and owe nothing, and have my Trial Membership cancelled. I agree to purchase at least Jour additonai books during the next 12 months after which I may cancel my membership at any time. Olid I Of ne* Milsers nntf Foreign n Canada aft TS PE-2SQ

Dsi

8 Digits Not 6 or 7 Digits 1 PPM TCXO Not 1.5 PPM - 10 PPM Dir a Hi-iff m PRE 30 l i f2 Resolution 1 Hz 50 MHz Not 10 Hz Resolution 10 Hz 450 MHz Not 100 Hz Thett tire onlv three functional requifement for a frcquencj counter i. Good an urarv ovt-r ieinpcriturt Resolution Good accuracy over temperature. Cryutal oscillators drift with temperature change . Thin change b specified in part* per million (PPM). The 5500 TCXO (temperature compensated crystal oscillator) holds an accuracy of 1 PPM from...

Wire Wrapping Tool

The new BW-2630 is a revolutionary battery-powered wire-wrapping tooi. The tool operates on 2 standard ,lC size nicad batteries (not included) and accepts either of two speciaily designed bits. Bit model BT-30 is for wrapping 30 AWG wire onto ,025 square pins BT-2628 wraps 26-28 AWG wire. Both produce the preferred modified wrap. Designed for the serious amateur, BW-2630 even includes both positive indexing and anti-overwrappmg mechanisms features usually found only in industrial tools costing...

Texas Towers

Texai 7507* 9 a.m. - G p fn Mon-fnr 9 a m. - l p.m Sat A Taxas Communication PiutJutii Company ITEXCOM) 2GG 29.50 25 38.50 45G 67 50 HDBX48 Free tlnndma 48-h. lowei MR mi HB*56 Fn-r-i,tanri,n SG-tt towv*r 1f)Lq F K 2540 43 t 5G f o I dove r towet PK255S 6 .fT 7& G f Jdower wer F K 2568 T 2bG Foldover lowe AU fi 4SG Foidnver to FK4553 bfi t Folrioyer toww- pj.d Ort m- to d(Mr inwn Tcet viert of Roc* M ufltiifl states J r G S104,50 (t) 305 fil 335 599 666 S729 839 S...

Call California Residents Call

_____________________limited warranty Prices and or sfieciflCJmonB sutrjstf in change wittioul notice or obligation TERMS MC - VISA - AE - Check - M.O. - C O D n US Funds Please add 10 to a maximum of S1CLOO for shipping, handling and insurance Ontors outsidtgefctlSA amp Canada, please add 20.00 additional o cover air shipment California residents add 6 Sales Tax, 9550 Chesapeake Drive San Diego, California 92123 714 565-6402 LCBA - Rechargeable Battery Pack Includes AC Battery Charger . 24.95

Pax Transistor Rf Power

A single tuned output amplifier designed to follow the OX oscillator Outputs up to 200 mw. depending on frequency and v amp tage, Amplifier can be amplitude modulated 3 to 30 Specify when ordering 6.67 ea. EXPERIMENTER CRYSTALS HC 6 U Holder 031060 3 to 20 MHz For use in OX OSC Lo 6.88 est 03106 T ' 20 to 60 MHz For use in OX OSC Hi 36.86 ea. 031300 3to 20 MHz For use in OF-1 L OSC 5.74 ea. 031310 '20 to 60 MHz For use inOF-IH OSC 574 ea.

Gismo

The FT-107 has been created as a result of a blending of technologies computer, solid state anc RF design. By careful utilization of these disciplines and the experience gained from our FT-301 series, YAESU has achieved an HF transceiver which offers unique features e. g. Digital Memory Shift , efficient operation and a level of performance that has been previously unattainable. 2 auxiliary band positions are available for future expansion RF Speech Processor SSB, CW, AM, FSK Built-in SWR Meter...

The Joystick

V i rs bic Pr q An trcn 11 n i iSens i j n bt idrf sggfrh cp nuo r EOi amp TierJjai anrj ar converVional .snlervicte Simple rapid erection tyol only but COMiNUniJSO Mhz in -1 0C amp MARS Qmni-diroct lt orvi gt Substantially Harmon it FREE e 1,000.000 milf s pnr wait unbeaten record1 aPoorOTH Agiihahcad CUFF DWELL IRS ANTENNA- QUO7'l- CO Mag K yflw rirri nigh Jioogh the Lmnnru vi'ili gperaic Kesp. at 15 liVdl t S W - l-l lt r -.vi 3-oltjri tlt bgarn Willi wtiibh compared it ThsMsji were...

Dealers

Your company name and message can con tain up to 25 words for as lit tie as 50 yearly prepaid or ji 5 per month prepaid quarterly , .Vo mention of mail-order business or area code permitted, Directory text and payment must reach us 45 days in advance of publication, t or example, advertising for the April issue must be in our hands by February 5th. Mail to 73 Magazine, Peterborough AW 03458, A TTN Aline Coutu. Mar iv Reynolds A A4 RM 395 Carolyn Drive A tianta G A 30329 select a frequency by...

Mastercharge Bankamericard

IN ALABAMA CALL 1-800-292-8668 9 AM TIL 5 30 PM CST, MONDAY THRU FRIDAY The all solid state TR DR7 requires no tune up It covers all bands 160 thru 10 meters and receives from 1.5 to 30 MHz continuous and 0 thru 30 MHz with the optional Aux-7. Modes of operation USB, LSBt CW, RTTY, and AM. True passband tuning greatly improves receiving performance in heavy QRM. Special high performance synthesizer, combined with the Drake PTOh provides smooth, linear tuning with 1 KHz dial and 100 Hz digital...

Digital Thermometer

d d ri 10rt p v11rj tfjfitfo fth i-n iba bmcdflr-lriud rri r-rr- ig Cantin-jivi LED fi ill J-tps r Set for Fttirtnlwt or CHum nadtng E it A A lt St 3 1 4 H P.6 a B 'KV 1-3 8O thejemo key asclieftmdod kc,i gt o v. Kit tan bu Ttfrttced pnio TIWt ny com putei iyniiri gt . The JE 1Q KH cornai com plcte uuiih in industriel fl' ' keylwerri witch euembly 62 heV l. iG'i, sacketa, connottor. elncfron c eompqnort und 4 double-iJd hj innl tl wint u boi'rf. the keyboard MiHitibly taqtilnt T50mA GO K y amp...

Dx

November, 1979, while not as hectic as October, offered a fine assortment of operations and increased activity for the chaser of countries, zones, prefixes, and awards, November is al ways sandwiched by the two weekends of the CO Worldwide Contest, each requiring at least a week's recovery for the serious contester and DXer. For most of the world, the only band which allowed one any sleep at all during the contests was 10 meters, and then only five or six hours per night. If you operated 15,...

Uv

6502 based single board with full ASCII Key board and 20 column thermal pnnter 20 char alphanumeric display, ROM monitor, hilly expandable 375.00 4K version S450.00, 4K Assem bler Sfl5 00. 8K Basic Interpreter S100.00 Special smalt power supply tor AIM amp 5 a ssem m frame 49.00. Complete AIM 65 in tMn bn- tcase Aitn power supply 405.00. Molded plasitc andteure to ftr AIM 65 pk power supply 47.50 AIM amp 5 KlM VtM Super Eit u ptn oipansjon boaro 3 female and 1 male bos Board plus 3 connectors...

Fcc

Repritft amp d from rhu Federal Register. Providing for th Amateur-SateWie Servlc AQEMCY Federal Communications Commission CTK gt n Notice of Proposed Rulemaking. ftUMMARr THll Commission orders Notice of Proposed Rulemaking to revise Part 97 of the Commission's rules and regulations. It is evident that the amateur satellite service has bccome an important facel of amateur radio, thus, it Is nqw time to develop rules for the service. Hence, a statement of the amateur satellite service...

Magnetized Signs From Fotografix

Foxtango Crystal Filter

Now, any amateur radio club can receive the recognition for public service work it deserves. Fotografix announces the introduction of amateur radio public service signs for emergency and mobile use. The signs are entirely magnetic and are guaranteed safe at highway speeds. They have been wind-tested at above 70 miles per hour Because the entire sign is made of a flexible magnetic material, it attaches securely to magnetic metallic surfaces without room for air pockets. The signs are available...

Infotech Me Trimode Converter

For those readers who are not yet aware of it, there is a revolution going on in non voice two-way communications. While hams still will be required to interpret Morse code reception to pass their exams, they nowhavG another option available to them for on-air operation. Automatic Morse senders and readers are now available as an operating aid. If you can type, you can send perfect CWT and if you can read, you can copy at incredible speeds At present, there are two classes of instruments...

Foxtango Crystal Filters

Fox-Tango Corporation, sponsor of the 4000-membert eight-yearold International FoxTango Club for owners of Yaesu amateur radio equipment, announces the expansion of its quality line of eight-pole crystal filters and related accessories to include not only popular models produced by Yaesu, but also those of Kenwood, Heath, Drake, and Collins. Noting that most manufactur ers of amateur radio equipment were content to suppty relatively few filters to supplement the SSB una supplied as standard...

Paranoic

I read w h interest Mr, Conk-lin1s letter in the November, 1979, Letters p.16 . First of all, my actions concerning the Russian woodpecker were not boo-boos. The Russians are obviously experimenting with their point-to-point 14-MHz band. I and hundreds of others were merely trying to verify the reports we read in 73. I chased the woodpecker on three occasions, and my excur sions into this mess were experimental in nature they were intended to help determine the nature of the phenomenon. I am...

Antenna Specialists Headquarters

NTTENNA SPECIALISTS i-MKTT.R, S 8 M AVE, tiAXN MO ML i ANTHNAAS KM J H SNAP IN HQI.F. MOUNT, HM-ISO. TRUNK LED MOUNT. 131.95 HM-JI7. MAGNETIC MOUNT 139.SO. 2-METER 1 4 WAVE. UNmr AIN MOBil.l ANTFNNA5- A5P-ftVj. PBUNK 1ID MOUNT. 0,110 ASP-6W, MAGNETIC MOUNT, tll2S. 2 METER. S S WAVK, GAIN MOBILE DISGUtSt ANTENNAS ASPS-74M. GENERAL MOTS, 149.TS A5P-7A0, LJEWYSIi.B FLY MOUTH, S5J.iG A5PH- iH, TOBD. .12.5 COUPLER FOR DISCUJSF ANTENNAS, 5PR 1M, 7S. RUBBER DUCKII ANTENNAS MM-4h V16-J2 MAl F THREAD...

Rear

Ph tlSN lt ,bip amp handling i gt and Onid - Wash reskU-fitt include fa Ph tlSN lt ,bip amp handling i gt and Onid - Wash reskU-fitt include fa JHt DMS IS a C MP . T LV JtSJiQ LVCiTAi READOUTUWT, that fte tft O ru Li .r nm v rifefifKfld itufl' llm f tf. 1 and ffiO Jhe DMK n e. in de R'oderjf cajHjtiiibri tpr cacti band ftp Jan iwv ti jfits iff tipgiarnmeii - cf coirtfroiNert r.-. ifrt gt Maeft to ccii'-'d of fit' Nirif-crif c rt gt fn- SEijtSfl i MO i n'fr fretjieni y B amp tb the Countw C OI k...

R

YAESU ELECTRONICS CORP., 6851 Walthall Way, Paramount, CA 90723 lt 213 633-4007 YAESU ELECTRONICS Eastern Service Ctr 9812 Prineeton-Glendale Rd.,Cincinnati, OH 45246 Jim Caraway W5SBL i in wood Circle Austin TX 78746 when a video display isn't quite enough Many hams and computer enthusiasts are turning to video terminals to get rid of the noise machines. There are times, however, when hard copy is desirable, and the purpose of this article is to describe how to obtain parallel ASCII data...

Finco

The most rugged 6 4 2 meter beams we've seen yet J A M0 10 ele, 2M beam 44.95 d A 2-5 5 ele. 2M be m, 9.5db gain 27.95 c A 2 2 10 ele, 2M dual polarization 46 .50 e A62 6 amp 2M antenna on one boom 74.95 A6-5 5 element 6M beam, 11db 46.50 e Afr-3 3 ele 6M beam, 7db gam 30.00 d Al' i 220MHz 10 ele, I3.8db ,., 32 95d 8UCK-SUSTER SF-2 ANTENNA Fits all Hustler delude mobile mounts 3 6 24 base 5 8 wave two meters. 3 db gam SWR a resonance ad gt 0 1 5 1 or t gt lTteir Bandw dlh 6 MHz 2 1 or better...