Callbook

Here's an offer you can1 refuse1 You receive three, information-packed, Amateur Callbook maps, folded, plus the World Atlas for only S3 75 plus 1 50 shipping and handling. If purchased separately, total value of map atias offer would be 6.25, plus shipping. You save 2,50 and get these invaluable radio amateur aids Prefix Map of the World, folded. World-wide prefixes. Shows 40-zone map on one side, 90-zone map on the other. Size 40' x 28 2. Map of North America, folded. Includes Central America...

Computer Specials

16K Compucotot- II with your choice of either 1 S 19,95 program dfakatto ot the Compucotar programming manual Atao includes thn SAMPLER diskette free from the manufacturer. retail value 1719.90 ell for 1650,00 1GK or 32K PET graphics or business models purchase the computers and get cassette drive FREE 16K PET (or CBWl S S9S.OO 3 K PET or CBM) 1295,00 BK PET 8745 Tha WORLD FAMOUS KIM-1 microcomputer board the original 6502 development system. Hi best way poaaible to REALLY LEARN com-putera over...

Diele

Dielectric, the leader in supplying the communications industry with RF measuring instrumentation, has a wide selection of Terminating Load Resistors. From a 5W dry load to a 50KW heat exchanger type loadt Dielectric has a dummy load that meets your power and frequency requirements. Low power dry toads are available up to 150 Watts, Liquid Air loads up to 10,000 watts and high power loads either direct water-cooled or with heat exchanger up to 50,000 watts. All loads have a minimum VSWR...

Dxers And Lists

A lot of true-blue DXers are very uptight over list operations. For those of you who have not enjoyed the spice of working serious OX, a list of calls is taken by some intermediary and passed along to the rare DX station, who then works the list and only the list. This can be very upsetting for some operator who comes along after the list has been drawn and finds that while he can hear ihe DX station easily. he can't work him. Oh, bitter anguish The operators of rare DX stations have several...

Am

Charts are calibrated in millivoits meter for a radius of one mile with a total rf radiated power of 100 Watts. To estimate the field strength for a different radiated power, Pj, it is only necessary to multiply the chart reading in the chosen direction by VTJ Pl* In our case. Pi is 100 Watts, The circles in the charts represent 61,8 millivolts meter at one miie, which is the field intensity that theoretically would be obtained if the 100 reference Watts were to be radiated from a single...

Fully Static At Dynamic Prices

Addressable on 16K Boundaries 4. Double sided PC Board. Solder mask and silk screened layout, Gold fingers. 5. All Parts and Sockets included 6. Low Power Under 2 Amps ' Typical BLANK PC BOARD S33 COMPLETE SOCKET SET 12 AV3-8910 As featured in JuJy. 1979 BYTE A fantastically powertul Sound & Music Generator. Perfect for use with any 8 Bit Microprocessor. Contains 3 Tone Channel Noise Generator 3 Channels oi Amplitude Control, 16 Bit Envelope Period Control, 2-3 Bit Parallel I...

Info

Quad Issue 432 quad-qgad-quad expanded Hl quad, two el quad mini-quad, 40m quad, quad experiments, half-uad three-el quad quad bibliography ET vfo tube troubleshooting HF dummy load understanding dB Hc SSB'CW RX geomelrjc circuit design. G5B-201 transceive, FET convener for 1O-20m til-pass RX fi JULY 67 VE ham radio hams D5B adaptor, hornets a lower transistor de 33 V rld's Fair rounc plan** an tenna G42U boarn SSTV monitor UHF F 1 preamps iC i' strip vertical antenna VHF UHF dipper,...

Communications

1 HEC 15th AVE, SEATTLE, WASH, 98155 * ( O i 36 300 locations (Walk-in customers only Bellevue - 12001 N. E. 12th Everett - 4610 Evergreen Way Open Mori, thru Sat. response. Tfie commercial filter is better, of course, and one will notice some difference on receiving, but it is a moot point as to whether any difference would be noticed when SSB filtering is considered for transmitting purposes or when rf speech processing equipment is being considered. In order to achieve the response...

Mta

* is freestanding witn use of proper base * Maximum Height is 6V (will handle 10 sq. ft. at 53') 50 mph * 4200 fb. raising cable - Total Weight, 350 fbs. Recommended base accessory RB-61A, FB-61 A. The MT-61 A is our largest and tallest freestanding tower. Bv using the RB-G1 A rotating base fixture the MT-61 A is ideaFfy suited for the SY33 or SY-36. If ynu plan to mount the tower to your house, caution should be taken to make certain the eave is properly reinforced to handle the tower. If not,...

W

Motorola MC1441QCP CMOS Tone Operator CMOS Tone Generator uses 1MHZ crystal o produce standard dual frequency dish ing signal. Directly compatible with I2key Chomeric Touch Tone Pads. Kit Includes the following 1 Motorola MC14410CP Chip 1 PC Board And all other parts tor assembly NOW ONLY 15.70 95H900C Preacaler divides by 10 to 350 MHZ This kit will lake any 35MHZ Counter to 350 MHZ. Kit Includes the following 1 Falrchifci 95H90DC Chip 2 UG-88 U BNC Connectors 1 PC Board FAIRCHILO VHF AND UHF...

Parallel Entry Digital Printer

. r (jijc pf ' '.Eef4 f+ril tf-B rtfl 11 Lri oJhISLj AFT .' idtd tal 14 tiuni. fp.M fur And lfl( ,1 iMlkvvut il Tiwl Fi-t --.M-1 I. H'tKif t llltOT J td L j CkMf l t I apt dut fil t fItst -n tJnMpTli par i F art r niukipli Pr r-- E-& ' UM - . -' J L. . .'L. . . . L'J > - . I -, ai h,, m 41 rii I up* Si fi 2 - . II- * 11- CM. Urn 2CUS& 49

Signal

DittMPEO ar FftOftSSKUlALS W0ftLft HIDE B1LUMS TRAPS HSUWTflSS QUID MITSMTEFIRA IIIS lOftl lllI MOUNTS WIRE CfttLf CQNNECTtitS KtfTE F d9 FULL ElTAlflt ftclm lie Sii.pi j FULL POWER, QUALITY HflM ANTENNA PARTS B1LUMS TRAPS HSUWTflSS QUID MITSMTEFIRA IIIS lOftl lllI MOUNTS WIRE CfttLf CQNNECTtitS GUAMNTE EG Call MUCH GLINK IS K , WA2 JOT Toll - fre* 800 448 T666 fNYS C llfCt 315 437-39531 KtfTE F d9 FULL ElTAlflt ftclm lie Sii.pi j UftiDlLLA ffETCQ DIVISION (flipt 73

Clock Kits

Trv your hand a building he Itne t looking Clock on the markel Its satin finish anodized aiuTimum case looks great anywhere while ** 4 LED digits provide a highly readable display Ttvs < s a complete kit no e* ras needed and it onty takes 1 -2 hours lo jssemble Your choice of caw i 0l0r* silver gold bronze black blue (speedy) Clock kn 12 24 hodr,OGkS SJ2.S5 ClOCk wiin 10 mm ID timer 12 24 hour Alarm clock. 12 hour only, DC-fl 24.9 For wired and lesled clocks ad.M 10 i> 0 h kj once Hour...

Toshiba Power Audio

5.8 WATTS RMS Typical Output. 50 to 30,000 HZ -3 DB. For CB's, tape decks. PA's, etc. Works off of a single supply voltage from 10.5 to 18 VDC. 10 Ptn plastic DIP with special built in heat sink tab Perfect for use on 12VDC. With Data. P.O. BOX 401247 GARLAND, TEXAS 75041 (214) 271 2461 TERMS Add 50C postage we pay balance. Orders under 15 adtf j 75c handling No COD We accepl Visa, MasterCharge ana American Express cards Tex Res add 5*o Tax Foreign orders' J (excepl Canada) add 20S P& H 90...

Vbx

Continuously ariabte to suit ypuF Passband Tuning with 16 Pole Fillers Two 0-pole crystal filters in cascade provides a 1 4 1 shape factor at -TOOdB The ultimate in selectivity. Provides the ability to notch out CRM When used in conjunction with the passband tuning. provides trie ultimate m removing interference. Two independent high stability PTO s provide true split band operation The digital counter reads the PTO sefected, or in split band reads the PTO used for receive, then switches to the...

Line Printer Hammer Driver

BOARD Each board contains appro* 130 each MJE800 (Silicon Partington NPN hfe 750h 1.5A). About Si30 00 worth, over 100 1N4001 diodes, ptus support chips. The whole package is yours for only 14,95. HUflRY, WE DON'T EXPECT THESE TO LAST VERY LONG TON momentary, rated 6A 125 VAC, micros-w ch pzt -3N2 21 - Or y S1 ,54.

More Specials

RCJ135D* 1SV H VOLTA t REGULA TOW IC Wr Itapin v tmg r-.-.' PC 16-30V* hI J c * Wrtti DitiS t ndSdwmliti mDIP f 1 S ilC4l3fi Qu*l 741 La* U v Dp -,DIF LM13W FM Vuttrpt i w D-mnhjjt PlP O.f LM2TTT FM iFSuCdyxtRnOF Amp. Del.Umilvl Dl DJ9 Hw C* Dk 0 4V IttiA C Im, OO 100 ZENERS Specify 3.3. 3 9 4 3. 5 1. 6 B2 400rhW 4,t1.00 .1. 10. 12. 15. 16 18.20.22. 4 17 or 23V 3 1j00

General Features

Ail towers use high strength heavy galvanized steel tubing that conforms to ASTM specifications for years of maintenance free service, The large diameters provide unexcelled strength. Alt welding is performed with state-of-the-art equipment. Top sections are 2 O.D. for proper antenna rotof mounting. A 10' push-up mast is included in the top section of each tower. Hinge-over base plates are standarci with each tower. The high loads of today's antennas make Wilson crank ups a logical choice.

T

Ltirn me irutft itairt your latinu Flli ris rHIQtiJll 'rKjM -'Ci FiJid R X sfl-fHUunc B ad& ifld 1 m MH SuripJe id u , - Self conimnefl Htm de tuce pCfu up tht wODC pt VLf rrtw Converts VLF to G meters. Rv au *cin jrt trecrTer cc cng 3.5-* MHi. *C jnc i detia hr lv perform jfice fteepr c-r. of tht 750 meter 941-1I Alto-coweri njwiijjuon radiabejconv WWVB. ship ta-ihare, and If tiTQadcjst barrd LOOP ANTENNA Loop Amplifier 67.50 Plug in loops 47.50 ea. Plug-ifl loops miiibft for 1600 SQODKHi...

Rechargeable

Hr ijf t Crll iiuifcft L atXt nmt fi nl rrl-ri flfrti- iir wfhiFd ip rirBirttrttljr t* far yrin wf e - p if er. it* rempart. * lh HT 1-2 *- x l l ni liai Sitte* ID pT- iii P> liV 2tV IJf lOCTtt t lw UTlJKraft Jp L tr.ii t l n F rh I tii fxjr Ln Untl & U i*Klt)l t> * I -T* sain imifi Art tMu c* m* f iuuu f Stac ked En e rg y I'oLr EJAkpi buy* ui- factory jroni Hy-Gals . VQU ftlll' li1 mriln h*V* H nLdJntetl 9 WnU Ajliff ChJp NF' 11 mi MnhJ Irhriiihtnr . pcid Motorola Ml rti-Lii* PLL Mitr...

Keyboard Enclosures

20 1K 3 3 20.75 Blue base, speciiv white or black top at last your shack organized A beautiful piece of furniture your XYL will love itl Deigned with angled rear shelf for your viewing comfort and ease of operation, RNiSHES Walnut or Teak Stain. Afso available in Unfinished Birch. 134,95 Additional inform .on on Request. Checks, Mioney Orders, BankAmoricard and Masier Charge Accepted F.O.a. Culver Ci1yH (in CaW. Add 6 Sales Ta* ) S-F AMATEUR RADIO SERVICES 4334 KEYSTONE AVENtiE CULVER CITY...

Nsa

COG charges 05c to street adr v dress only We prefer street address as we ship UPS and P.O. Box rs take up to 50 longer to deliver. We accept VISA or Mastercharge. Please lis complete card number and expiration date. Altow 10extra for slipping of heavy itesm. We reserve the right to change prices without notice. All items listed are subject to prior sale. Some items iisted are In small quantities.

Keyer Optional

As stated in the beginning of the article, as long as the data is on the tape, the E-Z Loader will go a long way toward digging it out and loading it into your TRS-80, but you will have to give it a fair shake at least It has been our intent to make public a circuit that is genuinely needed within the TRS-80 community We intend no infringement on the rights of others, and reproducti on of the circuit is granted on a not-for-profit basis only. I will answer all inquiries it the...

Base Transceivers

tu j r rr-j-c j i* L jN(j trdiJfl Routine * I rant FVm I at lj- tndicalof L ht * Opiir.iiH.il Ht vi Seizing fuiLLlnin A v d i t I Write or call for Data Sheets, prices, etc. Export orders Contact our International Dept. 1055 W, Germantown Pk., Dept. S9 Norrlstown PA 19401 (215) 631-1710

Ghz Record Extended

Not satisfied with holding the world's record for states worked on the amateur 10-GHz band (five), the record holders have been working to extend It to six - perhaps seven. The sixth was worked, I'm glad to report. It ail started out last tan when Chuck Martin WA1KPS got interested in the Microwave Engineering Gunnplexeis and got a pair of them perking. The first contact from New Hampshire to eastern Massachusetts was re* lativeiy easy. 0hf it took us about fifteen minutes to find each other...

Wva

No bandswitching necessary with this vertical. An excellent low cost OX antenna with an electrical quarter wavelength on each band and low angle radiation, Advanced design provides low SWR and exceptionally flat response across the full width of each band. Featured is the Wilson large diameter High-Q traps which will maintain resonant points with varying temperatures and humidity. Easily assembled, the WV-1A is supplied with a hot d ipped galvanized i base mount bracket to attach to vent pipe...

N

Novice tape N 31461 5 wpm tape l.N 31450 TH wpm tape- l.N 31451 10 wpm lape I N 31452 13 wpm tape IN 31460 15 wpm tape I N 31454 17 wpm tap i N 31455 0 wpm tape i N 31456 22 wpm tape i n 3145T . ., 30 wpm tape I N 31458 35 40 wpm tape I N 31459 Ji*ttor Code Count aHHVT Cover* stau to A wpm I N 24611 < 16 wpm tN 24621 4.96 Sen bor Code Couw i10t-T Doubt tongtn CMring The Junior end Advanced Courses start Eitra Claea Code Couree *1 4-T Covers (rom 13 wpm io 22 wpm includes FCC type e*am I N 246...

Meter Antes Ha

Doublet, the total antenna length is a shortened half wavelength.) On Friday. December 8r 1978, I decided to try out the antenna on 40 meters (worst band first ). The first station called, DJ4fT(West Germany), came back with a 579 report. At the end of this QSO, SP7EJ5 (Poland) was calling and reported a 559 signal when contact was made. After supper, LZ1KUF (Bulgaria) was c ailed, but he did not come back. (I was not sure whether or not he hadl called CQ.) The next two calls resulted in QSOs,...

Lightduty Vise

The new Model VV-1 from OK Machine and Tool Corporation is a unique vacuum-based light-duty vise for precision handling of small components and assemblies. Featuring rugged ABS construction, it has 1W' wide jaws and l ,f travel for maximum versatility. Also featured are an oversize knob for precise positioning and screw lugs for permanent installation, For further informa tion, contact OK Machine and Tool Corporation, 3455 Conner Street, Bronx NY 10475. Reader Service number 05.

Ktf

Double tuned circuits for spurious suppression Easy to align with bulli-in teat aids t50-50 G-chan. 6M 2W Kil 49,95 t50-150 t han.2W 2W Kn 549.95 t5 -220 6-chan. 2 QMHZ. r iWKlt S49,95 t40 t20 11-ohan 450 MHi, 200mW Kil S4995 For use with SSS Xmtg Converters, Fm Exciters, eic LPA 2-15 VHF PA. 2W m 15-20Wr out Solid-state th switching. Kit only , ------- 59 95 LPA2-45 VHFPA.2Win 40'45Wout Can also be used with 8-10W drive Kil price Si09.95 LP 4*10 UHF PA, 200'500mWin e-10W Out Kit price - 79 95...

M

Abovq only partial Haling pl aso Inquire R U-S H, All Orders Shipped Seme Day Received FREE Freight on 20.00 & up prepaid orders All others Si50 iwight change 1979 Accessory Catalogue in stock send S3.D0 Longer Hours Mon-Sal 9a 10p. Sun lp Call or write today to piece your ordof (SI8)465-3367 Dflpt 73. 17 Washington St., Rensselaer. N Y 1214A T V C B AMATEUR RADIO STEREO-MONITORS ELECTRONIC PARTS C105

New Electronic Parts

AfD cofffmwi to itt Hm I dwfif KVNn II ot fe Ihm k w *t c AIE umirs miull ic-npcriiiT Ji< k lh< rifl, Ho o trmtc (ittfwl cmmkImm. All art tuT Id nunbl ind conit comptait wrth detaPed inilrucliaf mannil. kanntd Fitqutnir displAftd on digital readout finfcpi IC22SK In e h unir OFF od* Ifet rig gptrifei iwnii In Ihf icmntr OK modt Hit lc*nt I'M i pnsri Ist jibi i w J Iw fB ii i bb - M fui m Ac Mt Ii umtat f M r ori t g tv s Ufo fet ivHtb taitlDCKM*adfciri artkfto

Maps Call Toll

Bsvti An> ennai HM OC* W Wm Orr WfcSAi WW Xntnw by Wm 0 fiSAi * lW a AH About Cubical Quad by W Orr wtSAi The Truth About C8 Antenna* by Wm Oit W6SAS i M 26202 I E IM AC Care and Feedtog o* f Grtd Tute 305 . * < The Arum Handbook I M 26207 I K VMF HihdbMk by wm Oft. WaSAl r N 26 3

Ox Capitals Of The World

Sponsored by the editors of 73 Magazine. 2. Available to licensed amateurs throughout the world. 3. To be valid, all claimed contacts must be made January 1. 1979, or after. There are no mode or band restrictions. 4. To qualify, applicants must work and confirm fifty (50) different national capital cities located in DX countries shown on the WTW (Work the World) DX Listing. 5. To apply, make a se f-pre-pared list of contacts made in prefix order indicating the station worked, date and time in...

Btv

M01 Mobile mast 22.95 c M02 Mobile mast 22.95c RM10 10 Meter resonator 6.95 b RM15 15 meter resonator 7.95 b RM20 20 Meter resonator 6.95 b RM40 40 Meter resonator 14.95 b RM75 75 Meter resonator 16.95 b RM80 60 Meter resonator 17.95 b RM10S 10M resonator 2KW PEP 11.95 b RM15S 15M resonator 2KW PEP 12.95 b RM20S 20M resonator 2KW PEP 13,95 b RM40S40M resonator 2KW PEP 16.95 b RM75S75M resonator 2KW PEP 31.95 b ft M SOS 0M resonator 2KW PEP ,31,95 b CG144 5.2db 2mtr ant s 8 x24 stud 26.95 b...

Egyptian Progress

As the first woman member of the Egyptian Radio CiubT Inc., Granite City ILPI feel compeNed to respond to the Letter to the Editor written by Tania Miller WB9TKC that appeared in the August, 1978T issue of 73 Magazine. Tania's letter was written as a result of the difficulty experienced by women who wished to become members of the club. At that time there were enough members who did not want women in the club to block any attempt by women to join. Since that time, however, open-minded members...

Output It To The Interface

SEVL-J SEVE> SEVCJ SEVEM SEVE 1 SEVE'l SEVEJ1 SEVE J- S VE3l ' SEVE J- SEVEM- SEVL'J SEVI. - SEVEN EVEJ SEGMENT SEGMENT SEGrtEMT S EGM LJ T t.Gil iX SEGMENT 5eg IE IT S EGM tJ T SEGMENT SE6HE4T SLGMEJT S EGM EM T 5 EGM il J T SEGMLJT SEGMENT 5 EGM ETJ T CODE CODE code CODE CODE CODE cg de CODE CODE CODE CODE c r de CODE CODE code CODE FOP. FOR FO FOR FOR FOR FOR FO T FOR FOR FOR FOR FOR FOR FOR FOR

Multiplexed Leo Display

Regardless of their application, most microcomputers need peripheral I O devices for the input and output of data. The more common output devices included seven-segment displays, 5 x 7 dot matrix displays, teletypewriters, and cathode-ray tube (CRT) displays. We shall discuss several methods that can be used to interface seven-segment displays, as well as several different programs that are typically used to drive such displays, which are widely used in electronic games, calculators,...

J

The article by Jerrold Swank W8HXRt Compact Seams for 20 or 15, in the July, 79, issue provides some interesting methods of compacting HF beams. Swank's method of feeding, however, may cause considerable exasperation to anyone who attempts to duplicate his results, or who picks up the tidbit about using a quarter wavelength of RG-59 U as a quarter-wave transformer providing a 2 1 step-up ratio and later attempts to apply the principle to a similar feed problem. Swank states, I used a quarter...

Specifications

SW W, 11 D. 11 * Electrical Power Consumption 117 VAC 50 60 Hz 12.5 Amps. Factory fused at 15 Amps, 234 VAC 50 60 Hz 7 Amps. Recommended fuse 10 Amps. 80 Mtrs 3.45 to 4.3 MHz 40 Mtrs 6.950 to 7.5 MHz 20 Mtrs 13.950 to 14.5 MHz 15 Mtrs 20.950 to 21,350 MHz 10 Mtrs With Modification by Licensed Amateur (Covers most MARS frequencies just outside the Amateur Bands.) RF Drive Maximum 135 Watts DC Input 1 KW CW and 1200 Watts PEP SSB * Input Impedance 50 ohms 15 1 VSWR APX. Spurious...

Vertical Antennas

Sfclf-suppcting, automatic band switching ve. near antenna. Omni-chr& ctional perior-mance. Favorable L C ratio High Q. True wave resonance on all bands, low angle .-fidraiion pattern taper swaggec seamless aluminum construction 12 doub-e-grip mast bracket. Full ciruumtefence compression clamps at lubmy joints. Weight Omni-Directional Performance Thfee beefed-up Hy-Q traps permit auio-malic switching. 5 band capability. Favorable L C ratio. Top lading coil Across ihe band performance with...

Free

IC Or FET't WITH S5 Si 10 ORDERS.t DATA SHEETS WITH MANY ITtMS r mi tu I I inip Vnt n* f hud mcfiulatl .jwl * vjt * ih AV tV * U A 1JV * Ofr-A < W I ., FfiF 01 W fw p aqi.wllx prjri (il 71-0- '1 Ii * b I J unui -irhM I HFOUCST - TO t w. , f tr* M- > n a UFJJffl l OAY.AIt l.n- , * l iHim rt WRITE r i ftf CMAL.OQ f'Tt 'K i im- TO trmi- iridjrtjii u' irl m Jtiici I ., FfiF 01 W fw p aqi.wllx prjri (il 71-0- '1 Ii * b I J unui -irhM I HFOUCST - TO t w. , f tr* M- > n a UFJJffl l OAY.AIt l.n-...

Sep

The Adrian Amateur Radio Club will hold its 7th annua hamfest on Sunday. September 23, 1979, at Lenawee County Fairgrounds, Adrian, Michigan Featured wiil be prizes, games, and programs. Tables are available at 5,00 per 8 ft. space, 3.00 per 4 ft, space, 1,00 per 8 ft. trunk space, and 2.00 for an inside space. Taik-m on 146.31 ,91 and 146,52. For ticket and table information, write Adrian Amateur Radio Club, tnc.T PO Box 26, Adrian Ml 49221, or call Bob or Sally Fay of Sword Enterprises at...

All Models Have Many Standard Quality Features Including

ANODIZED ALUMINUM CASES - PROVIDING RF SHIELDING 1 MEG AND 50 OHM INPUTS - WITH EXCELLENT SENSITIVITY * AUTO DECIMAL PLACEMENT AT Hz AND MHz AC-DC or Nl-CAD BATTERY PORTABLE OPERATION FULL YEAR 100 GUARANTEE PARTS ONLY ON K-7I NBS TRACEABLE CALIBRATION COMPACT SIZES 8010 3 H X W x 6Y2 D K-7000 7010 H x AVa W x SV* D

Godbout Slashes Static Memory

Econoram* unkits are now at their lowest prices ever. What's an unkit It's a standard Econoram board that has all sockets and bypass caps pre-soldered in place. To complete assembly, the user simply solders in a few other parts, and inserts all ICs into their sockets. The result A one-evening project that saves money while offering true CompuPro Econoram quality for those on a budget- Static technology used throughout all boards except Econoram VI run with 4 MHz systems. Same 1 year limited...

Ultra Compact Watt Versa Tuners For All Your Nees

MFJ-901 VERSA TUNER MATCHES ANYTHING, Lfi THRU 30 MHz. NEU LOWER PRICE MFJ-90Q EC NG TUNER MATCHES COAX LINES RANDOM WIRES, NEU LOU ER PRICE MFJ-901 VERSA TUNER MATCHES ANYTHING, Lfi THRU 30 MHz. NEU LOWER PRICE for man lili hi. Mrtch ipofti, IM,, r ndom wlrnt, vinitili. mobWi M mi. b iinced Un , M. 200

Address Vgrd M To

I JCRE MT T rt LMORY GET THE DIGIT EJAbLt CDMPAI'E IT TO THE ELEVLJTU 1UG1T L AbLE CGl T HAVKJ'T DISPLAYED ALL TDJ DIGITS YtTi SO DO TWO ORt HAVE DISPLAYED ALL 10 DIGITS. SO DISPLAY THEM ALL AGAM GET THE PACK LD BCD WORD J TO A THEM USE THE LOOK-UP TAUL TO DETEHii I it THE PROPER SEQUENCE GET THE SAME WOKD AGAIJ ROTATE THE FOUR HITS HtO SAVE OyJLY THL FDUP LSbS C 017 - HEX or> SAVE REGISTER PAIR H OJ THE STAK LOAD Rh tSTEK PAIR A VI Til iHE, BASE ADDTtESS OF THE LQQ i-L P TALjLE ADD THE LO...

Cb Special

Brand new printed circuit board assembly. Used in all HyGam 40 channel CB transceivers Fits many other manufacturers' units also Squelch pol volume control channel selectoi sw ch not included 1- 9 7,50 ea. 50-99 6 00 ea. Soard NEW Hy-Gain Remote 40ch CB Less case Speafcer & control m. tas.st Si4 95ea tj-.'A h, Gain 40c 1 CB Less Case Speaker Knobs as

Fma

All the features of the 2G15R and now with adjustable sine wave PL 60 Hz to 203 Hz. Adjustable tow power position 1 Watt to 16 Watts. SHOWN WiTH OPTIONAL P-000 KNlCRO PRGGRAVUEP 2Q16A from Aioeico and II pay sNpp ng and insurance in Soriy n Charge ar accented o 2GT6A Capacitor kit 5 50 See si* page construction article in Dec. f 97S 73 Magazine

Rk

rt flp Ctp- B1'1 Ufa lnr- m uU - r W -. Now you can get the best for less Just clip out the coupon below, bring it to your local computer store, and you'll get 1.00 off the list price of any program package from Instant Software Golt Applesoft II + 20K Order No. 0013A. Bowling Trilogy 20K Qraer No 0040A. MATH TUTOR I The Math Tutor I package s designed to help younger children learn the concepts of mathematics. It uses the technique of positive, rmmediate reinforcement. When the child enters a...

Driver

Schematic of Triton IV as modified for efficient QRP operation. Fig. 7. Schematic of Triton IV as modified for efficient QRP operation. tor power plug to the transceiver. The design idea could easily be altered to suit other solid-state rigs as well. Now you may say, But my solid-state rig is easily capable of QRP operation as is, I just back down the drive to the finals until I'm drawing about 0.8 Amps at 12 volts and I'm running about 10 Watts input. Ah, yes ' I reply, 10 Watts input,...

Axh

Schema tic diagram of break-in unit. The diode across the first relay delays its release the capacitor across the second relay delays its action Parts va ues are not critical. Contacts are shown with relays not energized, not-so-neat rows all across my back yard. There are lots and lots of noisy, old-fashioned relays in MY junk box. It seems the problem with relays is that the contacts cannot handle nearly as much current when they are opening and closing as when they are already...

P

Box 396 D, Portsmouth, R1 02871 my teacher. I became WN7CMZ. 1 was legal, t could transmit At last And with such modern, up-to-date, ready-made equipment as I could not have imagined to exist a short time before. Look out, world WN7CMZ is about to transmit Plug in the crystal- Fill out the logbook headings, Warm up the tubes. Trans-fabulate the franistan. Borrow W7KWjrs swr meter. Prune the dipole to the last half inch. Pull up a chair. Throw the knife switch to receive....

Brodie Electronics Company

2537 Edgewood Drive B42 Moore, Okla. 73160 405-794-0406 gadget freaks will love these solid-state replacements D N. Etiis WA2FPT R. Dfc J, Box 108A Uister Park S Y 12487 Are your bored with rotary switches in your projects fcven if by some slim chance you are not, here are a few simple remedies tor replacing those tiresome rotaries with a sequentially-stepping counter that lights one of a string of LhDs each time a pushbutton momentary switch is pushed. The cost of such a system is about as...

Fearl

Any hams working in the military or for the military services as civilians should definitely bring their gear along on permanent changes of station to Japan. Write to FEARLT do Sam Fleming KA2SF. USAGH D10, APO SF 96343, or call 228-4703 (military number in Japan) for info- Licensing is done by US Forces. Japan. All US license classes get full privileges, except that no mobile portable operation is allowed (except MARS, where we have 2m frequencies and repeaters, etc.)-SFC W. J. Graham KA2WG I...

Dla

File preserve and display 240 QSL Cards in this handsome FREE Album- Tired of cluttering up your stuffing QSL s In drawers and EKwes A great new way to organize, preserve and display your QSL cards is in clear vinyl pocket pages Each specially designed crysiat clear heavy duly page, holds 6 cards (back to batik) Ttieroomyr x6' pocfceis even hold (hose extra large Japanese QSL's, With every 40 pages (minimum) ordered, you'fi receive a Frue handsome 3 k 14' sturdy 3-rTr In durable Brown-Hide1...

Aptron Offers The Atv Enthusiast The Most Complete Line Of Equipment Available

Model 15706 ATV REPEATER o complete unit- transmitter receiver-demodulator, control, identifier, power supply a complete unit- 15w transmitter with subcarrier sound, duo frequency xtai converter-ch2 or 3 outT power supply TX15A ATV TRANSMITTER a complete unit- 15wt subcarrier sound t power supply *XR 70B XTAL CONVERTER dual frequency, ch2or3 out, high performance, power supply samples-detects video modulation at xmtr output, video output drives any standard Iv monitor *TD100A VIDEO-AUDIO DEMOD...

Rock Hill Sc

The York County Amateur Radio Society will hoid its 28th annual hamfest on Sunday, October 7, 1979, starting at 8 00 am, at Joslin Park, Rock Hill, South Carolina. Registration is 2.75 each, or 2 for 5,00 in ad* vance, or 3.00 at the gate. The main prize is a Yaesu FT-901 DM. A barbecue dinner is available at the park. Talk-in on 146.43 147.03 and 146,52. For more information, write York County Amateur Radio Society, inc., PO Box 4141 CRSh Rock Hill SC 29730. The Biossomland Amateur Radio...

Car Clock

A super high perioral4rt( FM wireless mike Vit1 Transmits a si able signal jp to 300 yards m b e*cep tionail audio quality by mftjn ot < ls built In eiectrei rfitke K N inc uOes aSe mike on-of+switch tJfllieri, and supef msTrucTiors This s ire finest unit available FM-3 HZil 3 < *ired ana ce& ed 16 95 Here S i iuoe- forking rjgged and accurate au o clocfc wh en a snap o build and msialf CJocv mqvemenl nsccmoieSeif assembled-> nuonly solder 2 and 2 swtcnes lafcffs abou minutes 0 i ji .i...

For Over Major Lines

NEW AND USED EQUIPMENT Get on our used equipment mailing Hat. TRADES WELCOME The best allowances anywhere We buy good used SSB gear* OUR EVERYDAY LOW PRICES remain the same for cash or trade-ins SAME DAY U.P.S. SHIPPING Just a phone call away COMPLETE RADIO SERVICE SHOP Mail Order Repair Service * Fast Efficient Service * Most Repairs Done and Shipped Within 7 Days * We Repair All Brands Amateur Extra First Class Licenses * All Work Guaranteed Include Manuals and Power Supply Send Us Youi...

Guide

With Digital frequency control with 4 memories & manual scanning, alii solid state. 2D0W PEP SSB 160W DC, 160-10 meters, WWV, adaptable to 3 proposed bands, microprocessor IF shift, noise blanker. RF AGO. Dual R1T VFO & memory fix), SSBXW, & FSK. 13.6 VDC operation An all mode HF total communications system. Freq, coverage 160 thru 10 meters, 200w pep, RF speech processor, built-in VFO, reject tuning, variable IF band width tuning, LEDfreq. display with memory, built-in Curtis Keyer,...

Huge W Led Digital Readout

4 CHANNEL RAM SCANNER W(TH IC MEMORY AND AUTO TRANSMIT Piogram any 4 frequencies and reprogram at anytime using the from > anel controls search for occupied fclosedl channel ur vacant jopen) channels Internal Mi-Cad included ip retain memory (no diode main* to wire or change . MULTIPLE FREQUENCY OFFSETS NO CRYSTALS TO BUY EVER Any offset any split1 Odd Bail splits accomplish.by digital programen ng Never any n ed for crystals' INTERNAL MULTIPURPOSE TONE OSCILLATOR 8U LT IN Sme Wave l 7& 0...

Ot

Cimtir DIL'RII jriDh Hllh WJAU IbU 1 htJINDLES TOLL 2 KW PEP AMP THLW SOME Hryad Handed 3 40 Wc 2. HELPS m PRDSLEMS HT Sedutlni Cfei Line RftiaLfefln 3. SDW ALL STAINLESS SIfEL HftHDWflRE. D uhl-n Si vc Elaleg 1 IMPftUVES F B RflTlU By ftautinj Cc 'Lin- PiSl Up 5. REPLACES CENTEft IMSLJL ATQA. WilPtslandi Antenna Pm , ul Ovtr ZW L( s fi. flWLT-lfe LlCHTNPHC ARfiESIEH. Hitp iiotr.i Balulif- d Afe Sn e VDiir Va Ette uii.ir BUILT IN HANGUP HOOK, ideal I it J trted Vc'es MuLli-Dand fintinnas,...

Tone Decoder

Lone decoder on yO PC bo0r-i r tuftf 40D-500 H adiuv abifl ringe vie 20 lurn pot voltage regulation. 56' ir- 1 ' h - i il lor Tweh tone det Klir-.g tone bur t detection. PSK eit C n Fil*o t> e med as a stable tone en-todrt' Riin& c> r S Id 12 vorts Comp4et(t kii T -1 55.95 fighift li.ckef wirr music One hgM Itw tows ont loi the mtd-fartge and Oni< r np t-ghs acf channel iTitl -.duiili> djusTab e and tfnves Uplo '10'iW ureai lor part-M sand ni isii n if tlubs Liner more Compleiekit...

Hamtronics Six Channel

In use by the hundreds throughout the world. Unlimited applications Commercial grade destgn Easy to uild & align 70 or 100d8 selectivity options Low system cost Cdmpartmentlzed shie ding r70 VHF Receiver kil for 1QM. 6M, 2M 220 MHz or adjacent commercial hands--------------------574.95 Optional xtal litter fix 10OdB adjacent channel 10.00 R90 UHF Receiver Kit Tor any 2MHz segmeni of 360 to 520 MHz band 89 95

Oct

The Long Island Mobile Amateur Radio Club, Inc., will hold ds Hamfair 79 on Sunday. October 14, 1979, from 9 00 am until 4 00 pm at the Islip Speedway, Rte. 111 (Islip Ave.), one block south of Southern State Pkwy.r Exit 43, or come south from the Long Island Expressway. Exit 56. Islip. Long Island. New York. There wil be free parking, door prizes, and several contests. Admission is 1.50 non-hams are free) and 3.00 per seller s space, which permits one person to enter. For information, call...

Hot Tripods

UPS Shippable. HDT-10KD 10' tripod, hvy duty 49.95 9 HDT-5 51 tripod, galvanized 24.95 f HDT-3 3h tripod, galvanized 15,95c ST-SN Stainless chimney mt (pair) 17.50 c PFM71 Hvy duty self sup roof mt 8.95 c 2791 Guy wire wood screw hooks (3)-. 1.54 a 2751 thread x 7V turnbuckle (3)____3.46 b 2871 50'm alum ground wire 4,35 b 2876100' 8 alum ground wire 8,19 c GND-4CP4' copper plated grnd rod 3.39 c S-1625P 2Vz ft. x 1V* mast 3.95 c A-125-5P 5 ft. x 1 aEum mast...

Exchange

QSO number, RSTt and QTH (ARRL section for non-Delta Division county and state for Delta Division). SCORING Delta Division stations score number of QSOs times the number of ARRL sections < 75 maximum) outside Delta Division score number of QSOs times the number of counties worked < 316 maximum). DX stations may be worked by Delta Division stations but do not count as multipliers. ENTRIES AND AWARDS Logs must include date time, station worked, exchange band, emission, and multiplier. Logs...

Gainesville Ga

The Lanierland Amateur Radio Club will hold itssixth annual Hamnic at the Lake Lanier Islands Dogwood Pavilion on September 23, 1979, There wi l be two large covered pavilions and a large parking area for the swap shop and exhibits. Food will be available. There wili be no entry fee for Hamnic however. Lanier Islands charges a 2.00 entry fee per car. There will be picnicking, hiking, and swimming available for the kids. Trailer hookups and camping are also available on site. First prize will be...

Message Memory Keyer

Could use this switch for brake release, if you use the control box with the Ham-M rotator. Calibration of the new control box is quite simple. You should not have to repeat it unless the ac line voitage changes drastically or the length of the control cable changes. Connect the new control box to your rotator control cable and depress the POWER button. Use the RIGHT push-button to turn the rotator to its fully-clockwise position. The display will stop changing when you come to the end of...

Evd

ASST G 10 ea 150K 160K 220K 270K 330K 390K 470K 560K 680K 820K ASST H 10 ea 1M 1 > 2M 1.5M 1.8M 2,2M 2.7M 3.3M 3.9M ASST A-H INCLUDES ALL RESISTOR ASSORTMENTS (800 pes) 100 pes 2,40 100 pCSS2,40 100 pes 2.40 parts on a budget We guarantee your money s worth. ONLY 1,00 ea. 3 Blade 4 Dianteter 75CFM 115VAC. NET 517.00 YOUR PRICE 9.95 Wait now. these are not pull-outs or something like thai, these are new

Syracuse Ny

The Radio Amateurs of Greater Syracuse will hold its annual hamfest on October 13, 1979, from 9 00am until 6 00 pm at the New York State Fairgrounds. located adjacent to l-690t 3 miles southeast of the New York State Thruway, Exit 39, one mile northwest of Syracuse, New York. For com merctaf exhibitors, a fee of 15.00 will include a booth with a display counter ten to fifteen feet in length or a lable and two chairs. Included in the 15.00 fee will be two tickets to the hamfest. Accommodations...

Free By Popular Demand

With min. purchase of 50.00. you Wirt receive free a 5 function Naiionai Semiconductor LC D mens watch. With min jHirchase of 100.00 you will recede free, our LC D car clock, (w tch and clock advert.-sed fn Dec jssue of 73 Mag.) For Master Charge Visa Orders Use Our TOLL FREE HOT LINE 1 -600-426-0634 for areas outside Washington incl. Alaska & Hawaii Ilkiii All ufiltJ'i sMppclI nrOmpWY Mifu.-iurn ijMrip iri.CKl iifJfl'i BCCBpkd A-.l Oi J fB Mil -, . I U i Of I'f Alld B'v xira lor inippmij i...

Spreading The Word

One of the jobs that I feel a national amateur radio organi zation should do is lobby for us on a national ievei. This means organizing campaigns which will get amateur radio favorably into the media articles in national magazines . . demonstrations which are covered by television. promotion of ham activities during emergencies, etc In case there is any doubt, we are not getting such a service from any of our national amateur radio organizations. Individual clubs, in a few instances, have been...

Dsi

ET Alpha Hart Key M usllor Ky-Gatn LC M Inventory Warehouse Our large volume assures you ihe best pri* esl We want your used gear We Buy or Trade V* 95 Kitts Lane, Newington, Conn. 06111 Connecticut Residents Call 203-667-0811 OI'LN MON.-FHL 10 6 * MUKS. 10-8 P.M. SAL KM I ASY DIKE C1IONS Rr. 15 S tiih - 2 blocks Mi Donald* Berlin lutnplkt*) Sub*Dealer Inauirie* Invited Send Letterhead for Comolmtm Packaae1. New Equipment - All m-u equipment an di*pldv i operating for actual on ihe air QSOs...

Repeater Control

RADIO ENGINEERING DIVISION C106 P.O SOX 2634E-F SAM FRAIMCISCO. CA 94126 Please Tush n e Tests-An& wers for FCC First and Second Class Commercial License. My 9.95 is enclosed. Now with three exciting new features Call or Write lor specifications MICRO CONTROL SPECIALITIES (617) 372*3442 23 Elm Park, Groveland, Ma. 01834

Texas City Tx Sept

The Tideiands Amateur Radio Society (TARS) will hold its Hamfest 79 on September 1-2, 1979. at the Nestler Civic Center on 5th Street, Texas City exas+ The registration and hospitality period will be held on Saturday evening, with the final pri2e drawing to be held on Sunday afternoon. There wilf be many small prizes, plus TARS will be gWtng away the winner's choice of a Kenwood TS-120S or Drake UV-3, a Wilson Mark HT. and a Wilson System llf beam. For further information and pre registration,...

AT

Therefore, with a well-designed antenna,the antenna tunermay be switched out for most operating, and the full advantage of using a no-tune all solid-state rig may be realized But for those occasions when operating in the band portions where the antenna is not resonant and reactance increases or when for some reason, the antenna develops a high SWR or a poorly matched antenna is used the antenna tuner should be switched in to obtain full RF power output. During those occasions when the antenna...

Ket

LOfil) REGISTER P nn UI Tl THE MEMORY address viietle the lcd digits are stored- 1 JCMiMtiT T LE MEMORY GET THE DIGIT fc i LE COHPHKE IT T THE EL EVE-J TA DIGIT tJHt t LOI T HAVEN'T LISPLAYEL ALL TEl DIGITS Y T, W TVO T10TI rtiiVt ISFLhYEL rtLL lu DIGITS S DISPLAY THfc-M H LL MIJhI J f,T THE PACCED LUD WO HU 1 JTO rt ROTATL Tj E fJVil LSB Wl TS UT THE FOUR M SU DITS .luvt U LV Tj L FOl'l ItSb ot KL1 ' LI T*tL DIGIT MrtdLL OUTPUT T,it ElGHT-biT V. H H Hl ILJT TAL L iilJ L UJT i it lou - htx 41...

Classics

Being a Novice of about three months, I find my subscription to 73 thoroughly satisfying and enlightening in ail aspects, t is very gratifying to have a publication on our behalf that pulls no punches and has its cards laid out on the table instead of putting up a smoke screen and being cloaked with the ''official finai authority attitude approach. In your June issue ( 225. page 13) Letters department, Don Hurley VE3HAN suggested an equipment evaluation1' booklet of rigs dating back over the...

Genesis

WPM CT7305 This Is Ihe beginning tape for people who do not know 1 tie code at all. It takes them through the 26 letters. 10 numbers and necessary punctuation, complete with practice every siep ot the way using the newest blrtz teaching tech nrques It Is almost miraculous' n one hour many people including kids of ten are able to master the code. The ease ot learning gives confidence to beginners who might otherwise drop out code sent at the office FCC standard mo other tape -ve've he.srd uses...

Dealers

Your company name and message can contain up to 25 words for as ti tle as 50yearly (prepaidh or 15 per month (prepaid quarterly). No men non of mait-order business or area code permitted. Directory text and payment must reach us 45 days in advance of publication. For example, advertising for the November issue must be in our hands b September 5th. Mail to 73 Magazine, Peterborough S H 03458. A 777V.' A it rte Co ta> Union town. Pennsylvania. Registration is S2.00. with a chance tor a main...

Touch Tone Decoder

HIGHLY STABLE DECODER KIT COMES WITH 2 StDED. PLATED THRU AND SOLDER FLOWED G-10 PC BOARD. 7 567 S, 2-7402, AND ALL ELECTRONIC COMPONENTS. BOARD MEASURES 3V * 5 INCHES. HAS 12 LINES OUT ONLY *39,9* DELUXE 12 BUTTON TOUCHTONE ENCODER KIT unfiling The new ICM 7206 chijj Provides boih VISUAL AND AUDIO indicalronsL Comes With IIS Own Lafle anortlzfid aluminum cabinet Measured only 23tA Complete Touch Tone pad, board, crysi *J, chip and all necessary components to finish the Mi PfllCEO For those who...

Puu

Fnat*ft*> guarameea * > f or arty teas on you are not a ftstted. out products may returned wtrh.n W tj*y for a tun refund (less shipping) Please ada i3 TERM Si tot Sbtppmg snc handling on i-f orders Additional 5 charge tor shipping any ttem over 5 lbs COD'S accepted tot orders totaling tSCOOor more Att orders shipped UPS unless otherwise specified Florida residents please add 4 sates tan Minimum order Sib 00 EQUIPMENT COMPONENTS WIRE & CABLE ACCESSORIES North 32nd Street Unit -1 Phoenix,...

Clegoab

Your present rig becomes a superb VLF LF MP HF receiver tuning continuously from 100 KHz to 30 MHz, ORDER YOURS TODAY VIA 1< B00 > 233-0280 or write for DATA SHEET Fu < refund - Le e shipping costs ) within 10 cays If not delighted. 19i 1 Old Homestead Lane Greenfield Industrial Parfc East Lancaster. PA T760I (717) 299-7221 The ONLY thing you need to know about Seat delivery plus Emergency Service with Guaranteed Delivery Highest Quality with gold M1L-C-3098 Process Ask for Sentry...

Mall Size Small Price

You're looking for an RTTY demodulator id VHF bands, take a look at the ST 5000 5m HAL, The use of active filters with no lase-lock loop or 'single tone' short-cuts isure the kind of performance you ex ict Full features in an attractive and con niently small package make this dernod Self -contained high voltage loop supply RS-232C voltage output (direct FSK) Audio tone fceyer (AFSK) Provision for external tuning scope Attractivem small cabinet f2.75 Hx 8 D x 12'' W)

Instapac

Something new has come upon the scene which promises ease and efficiency for the QSL fan. Its name is Insta-Pac ' and it affords the ham the oppor- has SWR and dual range wattmeter, antenna switch, efficient airwound inductor, built in balun. Up to 300 watts RF output. Matches everything from 1.8 thru 30 MHz dipoles, inverted vees, random wires, verticals, mobile whips, beams, balanced lines, coax lines. More inductance for wider matching range More flexible antenna switch More sensitive meter...

Personalized License Plate Fran Es

IN RAISED, WHITE LETTERS ON A BLACK BACKGROUND DURABLE, DIE CAST METAL FRAME * TH1PLE CHROME PLATED LETTERS CHEMICALLY FUSED * FITS ALL AUTOMOBILES ACCOMMODATES ALL LICENSE PLATES 1 EXCITING NEU GIFT ITEM WHEN ORfiERING. SPECIFY TOP LINE COPY II LETTERS MAX IN< LUHINi i SPAi JNGJ AMATEUR RADIO APPEARS AS BOTTOM LINE ON ALL FRAMES UNLESS OTHERWISE SPECIFIED il2 LETTERS MAX

Tape Recorder Salei

* Records to two hours, color or block b whit Records oft the air record one program while watching another Camera input to moke your own topes * Can be used with optional timer while you ore out LEmited supply - these 4,000 VTRs were demonstrators G come with new warrantee . . 499 H00 worth of new blank tope will be included ot no extra charge Send fo* our n*w cot clog Shipping ehoig* p*r ord r MO C O D.il

Bbbbbbbe

Ft CONOUtTOft RIB0DN WlftlT Off SIMILAR SMALL WJRE and inexpensive. All that is required is some wire, two potentiometers, two knobs, one male and female 4-pin mike jack, a speaker and miniature phone jack, a rotary switch, and a small box, such as the Radio Shack 270*236. To accomplish remote frequency selection, run a wire from an unused channel position on the matrix board (Point A in Fig, i) to the common of the remote 23-channel selector switch, via the accessory jack, as shown in Fig. 3....

Switch

Mouni 7312 to chassis heat sink, Choose R2 and CX for desired tone. Recommended values are R2 100k pot and CX .001 to ,0047. Trim pot around center and change CX for coarse range. wires (five are required) from the transformer base to each circuit. If any of the jumpers have to cross, be sure they are insulated wire, I'll add in here a few useful notes on Fig. 3 concerning the hookups and the parts to use Fig. 3(a) shows the simple form of wireless intercom unit used as a transceiver...

Amcoder

Select any CW signal that's 40 hz away from any other (Tune 400 to 1500 hz) Lock and switch to ' auto and you have tape quality audio. One and one only signaf reception, Only 20 mv of audio above receiver noise required for acquisition. A 40 db over S9 signal, 50 hz away cannot come through, Reduce operator fatigue by not listening to any other band and or signal noise except the one you want to work Variabie acquisition frequency 400 to 1500 hz. Variable output tone frequency 100 to 2000 hz....

Power Amps Save Energy

To be Linear, an amplifier output signal must be an exact reproduction of the input signal, with only the power levef changed. We are the originators oi the Linearized process Our amplifiers exhibit this m transmit operation by the very snnali amount of side-splatter produced when compared to most other amps. You use 2 to 3 times (ess energy for the same power output with a Lunar power amplified because our amps are 2 to 3 times more efficient. Another innovation Is our pre-amp capability which...

S

Pre-assemb ed Model 370-11 - S59.9S Kit (jlJiistrated Model 370-12 - S49.95 Elements (Table 1) 2 30 MHz 45,00 Elements tTable 1) 25-1000 MH 38.00 Carrying ca*e for Model 43 & 6 elements 27. 50 Carryinfl case for 12 elements 17.00 READ RF WATTS DlRECTLV (Specify Type N or S0239 con- nectors) 0.45 - 2300 MHz, 1- 0,000 Watts low insertion VSWI 1.05, Unequalled economy and fJaxibiiiTv, 8uy onty the eieme< t< s) lowering your present frequency and power needs, add extra rang* arer it your...

The Supersync

MARLO ELECTRIC CO., 5241 Botanic Ave., St. Louis, Mo. JuBt an Efficient and Reliable Form qF Rectification The synchronous rectifier that can be filtered The Super-Sync the only rectifier that delivers a pure LXC tone and gives 100 rectification at all times. It is the only rectifier that is adaptable to cither hi h or low power sets as it easily The commutator on the Stij> er is eight inches in diameter and is driven by a J HP. 110 V. 60 cycle 1800 With the Super there are no materials to...

MODEL

Equipped with large specially constructed contact points Keys any amateur transmitter with ease. Sends Manual, Seml-Automatlc, Fully Automatic, Dot Memory1 Dash Memory, Squeeze, and iambic MORE FEATURES than any other keyer. Has built-in sidetone, speaker, speed and volume ConirolS. BATTERY OPERATED,heavy shielded die-cast metal case Fully ADJUSTABLE CONTACT SPACING AND PADDLE TENSION. The perfect paddle touch will AMAZE you, Every amateur and licensed operator shouid know how 10 send with the...

T W

Fl 10 F 220 Fl 35 F 235 RM-1 RM-2 f r, Kit 115VAC f r k i 230VAC Fan Kit 1 t 5VAC Fan Kj 230VAC t 9 inch Rack Adaptor Adap ur 136*1 35 k Omm 135*135* SOnwi 301 n 381 * 14Q l B9mrT J i* * * 1 78mrr. t97*32i< 2smrt. 1 kg 12 2ltrs) 3.2 kg 7 tel 3 2 kgl 7tosl kg 2 2 lbs) .5kg 1 1 T lbs)

Be

Tt you Ji na id the finest, nO compromise technology. you need the FSK 1060 demodulator. Can't fee outoopted because its design, computer gride parts, *nd modern technology offer landJim copy over radio circuits. Stops QRM with selectable 55 or 100 Hi > filters and two tone limiter JeSS operation Decision level correction improves selective fading Uses either 170 volt, 60 Ma, or RS 2 32 loops Video operation available. Interfaces microcomputers. We can install your Xitex 5CT-100 board inside,...

OUTPUT

Audio-limiimg amplifier diagram, (This diagram is supplied with printed circuit boardsJ equivalent FET will do. R1 and R2 form a voitage divider which is used to bias the FET source and the op amp inputs at a point exactly one-half way between the power supply voltage and ground, CI ensures that the bias point is at ac ground With no detected voitage from C4 to the gate of Q1, the gate of Q1 is at ground, which is negative to the source, and the FET is in a pinched-off ' or...

Wholesale Retail

Quality American Made 10> 5.00 100 535.00 12.0 V. 1.2 AH fa 10 hr rate 4 v211 x 1 7 8 x 1 3 4 S1495ea E F Johnson External Battery Charger Model 2390206-001 ouipui Edge Meter 250 UA F Its m S 1 3 8 ho e MTG noies on each end MM cefiind panei Black scate 0 5 boilom 1-20 top SV25 ea & S5.00 Erige meler same as a ovi jwlth Silver scale ,ui< reads SWR MO I'i noie 1 Pe md pa> Scale i-30titMop Q-5 DOll m