S

Has precision (0.1PPM) TXCO Time Base Enjoy the great looks and ruggedness of the RF shielded metal case. Discover unsurpassed quality throughout for years of trouble free operation. Call or write for additional information or quick delivery of your order. Has precision (0.1PPM) TXCO Time Base Enjoy the great looks and ruggedness of the RF shielded metal case. Discover unsurpassed quality throughout for years of trouble free operation. Call or write for additional information or quick delivery...

Only

Low cosl 6-chann*i hand-held provides superb voice trans mi ssi or over short to medium distances Sharply tuned on-trequency selectivity in the flF amplifier stages plus FETsin the Island 2nd mixers tor virtual immunity to out-of-band signals intermodulation distortion and cross-modulation Separate microphone and speaker elements far enhanced audio Internally adjustable mtc preamp a Hy-Gam exclusive Specialty gasketed case seats oui water, dirt arid corrosive salt air Watertight, high-impact...

Info

To upgrade the software package described in my previous article.1 it will explore the etfect of riigtti ing SSTV pictures with more picture elements (pixels) and gra levels It also will tell how to rotate pictures and title pictures in computer memory. For those of you who are not aware of my previous article. I think a short review might be appropriate n my article, I provided an interface between an SSTV monitor, a ham transmitter, and an SWTPC 6800 computer system Fig. 1 provides a block...

Voltage

As an example, if we let the pulse height (V) 10 volts, F 100 kHz, and C 100 pF, then I 100 X 10 12 x 10 X 105 100 X 10 6 100 micro-amps. With a capacitor of 100 pF and a 100-microamp meter, we now can measure any frequency from 0 to 100 kHz. One interesting twist to the circuit (see Fig. 6) is that if we multiply the average current (I) by the resistance (R), we get (from Ohm's Law) a voltage, e. Our equation now becomes IR e RFCV. If we measure the voltage across the resistor with a high...

Receiver

Selectivity SSB 2.4 kHz at -6 dB, 4.0 kHz at -60 dB. CW (with optional CW filter 600 Hz at -6 dB, 1.2 kHz at -60 dB) Image rejection Better than 60 dB (160 15 m), better than Price And Specifications Subject To Change Without Nonce Or Obligation IF Bandwidth Continuously variable from 2.4 kHz to 300 Audio output 3 watts at 10 THD into 4 ohms.

Note

ALL LINE LENGTHS NONCRITICAL , IF LINES ARE ELECTRICALLY FLAT, OTHERWISE CUT TO MULTIPLE OF HALF WAVELENGTH (ELECTRICAL) Fig. 6. Method of interconnecting four yagis. The 438-MHz pattern in Fig. 1 indicates that the beam width at the halfpower points is approximately 25 degrees. Cain measurements further revealed that 16 dB of gain can be realized without difficulty. This gain figure can be obtained over a frequency range of at least four megahertz. Four megahertz is approximately plus and...

Heavyduty Rotator

For antennas up to 10.7 sq. ft. of wind load area. Mast support bracket design permits easy centering and offers a positive drive no-slip option. Automatic brake action cushions stops to reduce inertia stresses. Unique control unit features DUAL-SPEED rotation with one five position switch, SPECIFICATIONS Max. wind load bending moment 10,000 in.-lbs. (side-thrust overturning) Starting torque 400 in.-lbs. Hardened steel drive gears Bearings -100- diameter (hardened) Meter D'Arsonval, taut band...

Optional Accessories

Touch tone pad 55 Tone burst generator 29 95 CTCSS sub-audible tone control 29 95 Rubber flex antenna 0 Leather holster 16 Cigarette lighter plug mobile charging unit S6 Matching 30 watt output 13 3 VDC power amplifier (S30 89 Matching 80 watt output power amplifier (S80) 169 Boost your signal. . . give it the range and clarity of a high powered base station. VHF (135 to 175 MHz)

Optoelectronics

1 KHz - 50 MHz t Continental Spaclaliiea Corp. liir* Clttt*ik> n* and pnow Indudad tn.tr afco* chart a* a pufalisnad ft nunufjctun* s titefatufo w *t*v*tcntoot. acp ar*o in *ariy 197 . 0 IWStRUMCMTS only auumaa resro HjIhfy forM o*n Wtaitaittona AC-9 Battery Eliminator > 7.95 TERMS MC - VISA - AE Ch c* - MO--COD in U,& Tund*. Ploa** add to a nwwirnuro of SKI00 for ah)pp nc. handlmg and insurant Grtfem outstta of USA A Canada, pieasa add 20.00 addition to cow a* aiiiprsant California...

Micro Countries

A chap who specializes in getting information on very small and often virtually unknown countries called the other day. 1 think I convinced him to write an article which should be of intense interest to Dxers . and even more to hamming activity irom mere, more s the pity Ano Seaiand *s still vtrgin territory Do I have to start working on these things myself I have plenty to do without leading another expedition somewhere. He mentioned that as ia* as he knows. Miller s St. Brandon's Island is...

National Service

With your Beafcaf scanner w* will send all aooefr-sotib> . compJete set of simple operaiing instructions and a one-year limited warranty, If service is eve required on any 6r arcfli acuftnor purchasuti from Communications Electron 1c 7 Just send your receiver to a CE approved Bearcat national service cenler. Another Bwcat ifvice is the frequency informaiton hotline After yo tj your scanner from GE. you may call 317*694*1230 and get up to the second information on active frequencies m your...

St A A

- 'ilFT 00 tj ( O'A fui I A' TA MSf> IT P C TUM of the picture at 90 degrees. After much thought, I dec ided riot to rewrite the routine. The effect was very dramatic and has caused some interesting discussions over the air The solution requires a few patches to the program and the writing of a routine to subtract 64 or 128 from the index register. Since my memory requirements were tight and it might be tricky to implement a change, I left the routine alone- This routine was the most complex...

Tss

Rie TS-S2 S 5 a very popular 160-10 meter 5SB CW RTTY transceiver, preferred by DX operators and cttier particular Amateurs. Ii employs a single-conversion m w RP w bc cwi too w dc tsk Digital tKKjusncy display, with backup momiscals analog ihai IF shift titt rm passfcand fumng) to * CW- 20 (YG C) MD-H CW filter. witti the most operating features A comoi-nation of the R-820 and TS-820S provides the ultimate HF operating system- Full trarrtccfve operation with T3-82QS. providing lull ii&...

Ue

This is why it is referred to as a rectifier, or, in the mathematical sense, an integrator. Now that we know how the circuit works, we have to answer only two major questions. First, what can we use for the switches, and second, how can the The switching can be handled by mechanical relays or semiconductor FETs. Both of these devices require some kind of circuitry synchronized with the incoming pulses. The simplest switches, however, are diodes. The potentials...

Morse Code Program Available For The

Cost Effective Computer Services announces the AMCT-30* a program for the TRS-80 to teach and buitd proficiency in receiving Worse code. AMCT-80 (Automatic Morse Code Teacher) is the only Morse code program available that will automatically speed up or slow down depending on the student's proficiency in receiving code. Among the many options is the ability io iGceive in single or group character mode, Written In machine language, AMCT-80 is available for Level and Level 2 TRS-80 Cosf Effective...

Os

Abrams K6AEP J 758 Comstock Lane San Jone CA 95124 further enhancements for the K6AEP system SSTV is probably one of the most exciting means of amateur radio In what other mode of amateur communications can you see the person you are talking to even though the amateur may be thousands of miles away Interest in SSTV is grow-mg daify, and one of the easiest ways to experiment with it is by using a microprocessor. Never before have amateurs been provided with such a flexible, powerful...

Friends

START YOUR OWN ENCYCLOPEDIA OF AMATEUR RADIO AND SOMEONE ELSE'S RY TAKING ADVANTAGE OF THIS SUPER OFFER. Give yourself as well as your friends, relatives, or business associates the gift of 73 MAGAZINE at HALF the newsstand price, PLUS your choice of 3 of the back issues listed on the following pages, FREE Each issue is full of information on building projects, antennas, traffic handling, radioteletype, computers, and more. Look over the wealth of material included in these issues. There is...

Other Bearcat Accessories

SP51 Baitery Chirger ii.----- 112.00 Carrying Caw r< w SI5 00 SPS7 Carrying Cme for ThirtScan 15-00 31*210 Settee manua- for Bearcat 2)0 1-00 W2Z0 S ruK* manual i20 US 00 SM2S0 Servtce manuflJ for Swear 250 515 00 B 31-2 V AA NHCa< f* 0rFour*SuiPac* of 4 St5 00 3-4 T 2 v AAA Si-Cticfi 1 tlllnScan (Pac of * * TS.00 e-5flu placement mdm ry bflltsryW B< iircat2l0 15.00 A-135ce Gfyslai conihcaie 4 00 Add SaOO shipping tor nil accessories orcteredat ttw sume lime

Agk

I've spent enough money on final tubes to almost pay for this. This transceiver was recommended to me by old time hams (Xtras) whom I have known for 40 yrs. Has excellent break-In. Best package job I've ever seen First licensed 6AAV in 1926. Now in operation a sweetheart From a 32V2 SX115 to an OMNI is a big step Receiver prominent transmitter likewise-working comfortable plea sing design. First new rig for me in 10 years but seems to be very good. The best...

Rvt

D g iized SSTV picture memory map. so-called 60-Hz noise shown in the preceding pictures is due to the unpacking of the nibbles on transmission to the SSTV modulator on the interface card This noise, or jitter, is due to unequal cycle times in the software which was used to unpack each nibble tf I had been aw are of this problem during my initial coding of the program, 1 would have eliminated this condition. The 64 gray level pictures were formatted in a different manner. Since six bits...

Buy With Confidence

All Bearcat seann0rs are extraordlnary scann ing in stru-ments They provide virtually any scanning tunc > On that 1 h e m osi p rotessl on a I m onitor could r equ ire To 9 * f th e foarear delivery of any 13 0 n rent scanner, send or phone your order directly to our Scanner Distribution Center. Be sure to calculate your price using the CE prices in this ad Michigan residents please add 4 sales tax, Written purchase orders are accepted from approved gov emtnenl agencies md *el raied firms at...

Adjust

The standby operate switch ap* plies 7 volts dc to the relay coil in the operate position the other side of the coil gets grounded by the normally-open relay accessory part of the transceiver during transmit, It should be noted that plate voltage appears on the 811A at all times, but it draws no plate current unless relay K1 is energized I havf found that smaller relays do not like 1165 volts on their contacts, so interrupting the cathode circuit between was a logical move...

Fifth Annual Ham Workshop January

Members of the ham industry get together each January in Aspen, Colorado, for a week of skiing and workshops on ham topics. With the growth of amateur radio stagnating and he saJes of ham geat aiong ,vilh it, both manulacturets and dealers will be discussing plans for getting the hobby going again. Some of the problem is ob viously the drop In interest in CB radio, which had gotten thousands of newcomers inter ested In radio communications each year Another has been the worry over what might...

Tnk

UHF (400 to 512 MHz) models, lower power and FCC type accepted models also available. UHF (400 to 512 MHz) models, lower power and FCC type accepted models also available. NEW TOLL FREE OROER NUMBER (800) 42 1 6631 Calif residents please call collect on our regular numbers 11240 W Olympic Blvd Los Angeles. Calif 90064 213 477 6701 931 N Euclid. Anaheim. Calif 92801 714 772-920 Butler, Missouri 64730 816 679-3127 Prices subject to change without nonce AC DC Operatkm j M WM BNC inputs 1 Meg...

All Contained In A Small

Terminating load resistors from Dielectric 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 load, Dielectric has a dummy load that meets your power and frequency requirements. Low power dry loads 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...

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 NI-CAD BATTERY PORTABLE OPERATION FULL YEAR 100 GUARANTEE PARTS ONLY ON K-7000 KIT NBS TRACEABLE CALIBRATION COMPACT SIZES 8010 3 H x 71 z W x 6V2 D K-7000 7010 13 4 H x 4Va W x 51 4m D

Congressman To Help The Amateur Community Conquer Malicious Interference

Amateur radio is a service, not just a hobby, and must be protected ' These were the words of Congressman James Gorman, a democrat from Van Nuys. California, spoken in an exclusive interview with this re poner on Monday, August 29. 1979, at the congressman's San Fernando Valley office. met with Congressman Gorman after it had been reported that he had shown an interest in helping the amateur community to clean house, 1 wanted to know exactly where he stood on certain issues and thought you...

CM

CM-500 is a bus strip to be used in conjunction with CM-300 and CM-400 for distribution of power and common signed lines. Two separate rows of common terminals, grouped into clusters of five. All contact sockets are on a 100 in. square grid. CM 500 j MODULAR BUS STRIP Si 95 1 50 Preformed wires, from IVz to 4 inches, 20 AWG solid wire, white insulation.

Cn Oot Byte

A KD AS* ITH OOTS IF NOT 1ER0 ADO 00 return PRINT, 1 128 PI X-LINE 256 PIX LINE ROTATE 12S PIX-LINE UPON 128,5 UPDH 256 ROT 256 PIX-LINE LETTERS 256 ROUTINE TO SELECT MOD PROGRAM OPTIONS WHICH SELECT PIXELS LINE, PR INT I NG OF P I CTURES OR TITLING< LETTERS> OPT ION IS SELECTED BV THE APPROPRIATE NUMBER OPT ION Photo 7. TV menu for program option selection, for zero. If the results are zero, a return from subroutine is executed. If the results are not zero, the gray level byte DOTC is...

Contests

Robert 0a*er WB2QFB 15 Windsor Or A too NJ 06004 5 CONTINENT WORLD RTTY CHAMPIONSHIP 197*19*0 Sponsored by lATG-RadJo communications lATG-Radrocommunteat ions and CD Publications, in contm* uaNon of their more than 10 years of activity promoting the most advanced radio amateu' techniques, have decided to sponsor a new series ot contests for tefetypers of all continents. The purpose of the contests is not only to increase interest among radio amateurs for the radioteietype, but also to promote...

Data

A simple hardware-encoded (ASCII) keyboard interface THIS SUBROUTINE SEN SES A KEY CLOSURE 0*1 M ASCII KEYBOARD A* ID TH J 1N PUTS THE EIGHT-BIT KEY IM X7PUT THE DATA WORD THAT COVTAIVS 0Q 1 THE STATUS HIT FDR THE ASCII KEYBOARD AMI SAVE O JLY THE STATUS BIT FOR JZ JU1P bACK TO KfcYIM IF THE STATUS bIT KEYI J IS L ERO, btCAUSE MO KEY IS PRESSED 0 IV A KEY IS PRESSED- SO ItfPUT THE RET AJD THEN RETURN TO THE CALLING PROGRA'1 is a logic zero (no key is pressed), the A register will contain...

Des

Thr trtctrutkm ) Tetecaannumcwuorn UoKtfi waid* tfeui - , . m rrcofrat* f ht chwrnmnt tn tr> c*ifif thr trtctrutkm ) Tetecaannumcwuorn UoKtfi waid* tfeui - , . m rrcofrat* f ht chwrnmnt tn tr> c*ifif at amtteiir rt n otf tfc* l oaflft at amtteiir rt n otf tfc* l oaflft VRS Variable Rate Scanning, a dramatic new technique for unprecedented tuning ease and accuracy POWER 235 watts PEP and CW on all bands for that DX punch Advanced microcomputer technology developed and manufactured in the...

Double Your Warranty Policy

Any large piece of gear we sell you (average 300 or up) we will double your warranty period FOR EXAMPLE A 3 month warranty 6 months from date of purchase. 1 year 2 years from date of purchase. (OUR RELIABLE SERVICE DEPARTMENT REPAIRS NON-WARRANTY GEAR, TOO ) Simply send your rig in a good shipping carton, postage prepaid, with a copy of your receipt showing date of purchase. We will repair promptly and return by best way. NOTE. Manulaciuiers do not cover *naJ tn most cases tHii we aiH iry You,...

Enjoy The World Famous Henry Radio Service No One Else Can Offer Yog The Background Of Experience And The Value Of

KA A DW rrTlXJl 1 IL tr UtTNDV DA PMH Hemv RadiuaKu offer* i bmad Inn tt i-omitwf- VIAKPvlL IIIl J L.ir Ll rlLlllIXT r L-JlW. urtl and III tvpt w-pieA amplifier* c v Ht)9 thv tiingf ol 3 MH to 5U0 MHz. Henry amplilim ittF in umj all around thtp vi-urld Curnrrwjnal rttid export iiitjuirie art- invited. U'm Ji> - ujid state amjililien> an* available at Tempo dealer*. ihrou< hou1 tht U.S.

Hal Communications Corp

For our European Customers Contact R.chter & Co Hannover I E C Intprpteti Bissone Bill Gosney WB7BFK 2665 North 1250 East Whidbey Island Oak Harbor WA 98277 The response to the new 73 Awards Program announced in the September and October Issues has been beyond all expectations. Award applications are being received from all over. Countless letters and telephone calls of support have been received, each claiming 73 now has one of the best award columns In existence. Let It be known that the...

Ham Scan

Kenwood 7400A, KOK 2015R, KDK S016A, Pace Comm II, Midland 13-510, HW-Z036, others Features one channel of memory, without need of resetting dials to zeros as required by others. Unit mounts totally inside of rig, no external boxes. Scanning rate ZOO kHz nom, not 50 kHz, with a 3 second pause on all active channels before resuming scan. Mike-mounted switch provides 3 functions scan start stop, remote frequency incrementing, and transmit interlocking when in active scan mods. Totally assembled...

Hew

ALL SOLID STATE HF TRANSCEIVER PLUS A FULL LINE OF ACCESSORIES HOimi SAW Special low prices TR 7600 7625 and RM 76 Micro Processor, and TS 700SP Call or write for ihese special lowest prices yet Ask us about the NEW TR 2400 2M _HANOI TAt.KIF KENWOOD OWNERS We have the new Kenwood Phone Patch We stock the full KENWOOD line and provide warranty and after-warranty service. V BUY WITH CONFIDENCE . Unbeatable Prices 540-544 and Argonaut. Full Ten Tec Line in stock j

Ht

Testing to save your digital cncuita A fTTfioinputer iJ.ifplav Jnif Your Com fXiter CantUh Mo se Gaihity Ycut HT a haif wiup The Super Transmatch. Stmpt9 VHF Mon U> r g rat or EProcess, What's Up or 156 MH f. TT Pailf Ih Wilson HT. f Supply ina prociiui'Qns. compact mulltbano arp les, smoi dtg tal clock ac-cestory lo 1er H F ir n-ve* ver modern nor Mon* co es, muitl-rLndtoci generator am inning synihesiier errata. KP H charger Iflm mull element S PT 7S Cakuiatmg equency counter, WX sate J i...

Erc Br Ancf

SET DOT GRAY LEVEL I COMP OF GRAY LEVEL STOP F IN PICTURE NEXT ADDRESS IN PICTURE R ESTOP E A frCh T IZ BYTES OD IT AGAIN RESTORE 8 CFUL6AL SCUTINE TO RECEIVE ANO T A ANS Hl IT S 5 TV PICTURES HTH 6* GRAY LEVELS AND 120 P f . FI 5 L I NE ANO 12 LINES PRCGRaS CAtL SUR t0UT,*,ES US 0 lH SSTV5 < ENHANCFM6NT rout'jjfi jg****. **S i< 5iiS* S l S A,tI5f *- ---S -1 SSTV

Uch

Shortly before the deadline for the sale of 23-channel CB sets, a focal department store ran a special saie to get rid of an overstock of the Royce 23-channel sets. Since the price was so low, I could not resist buying one of the Model l-655s Although t didn't know exactly what I would do with the thing, I thought the PLL synthesizer was worth at least the purchase price of the unit. The radio sat tn the closet until I saw an ad in 73 Magazine for conversion kits to put CB sets on 10 meters...

Increased Performance Antennas

If you want the utmost in performance from you rf egency scanner it is esse nt J a I th at you use art ex te rn a 1 an e nna We nave six base and mobile antennas specifically designed for receiving all bands. Order A60 is a magnet mount mobile antenna Oider A 1 isagutter Clip mobile antenna Order A62 Is a trunk-lip mobile antenna. Order A63 is a 3 inch ftole mourn, order is a snap-in mount anteriba and A7Q is an all bandbasestation antenna, Atlantennas are 25.00and a00 for UPS shipping in the...

July Winner

July s most popular article, as voted by our readers with their Reader Service card bai-iots, was James Wyma WA7DPX1s So You Warn to Raise a Tower. A check for S100 is on its way to him. I have acquired a Modei 34 oscittoscope manufactured by Bell & Howell Schoofs - De Vry Institute and need manuals and or information on it I wouid like to purchase the manuals, if possible, or borrow tht> m for copying. I wilt pay for ali expenses. Any assistance will be 1 would like to exchange ideas on...

It

The mike connections can be made via either the front-panel connectors or the accessory jack on the back of each rig. The capacitor and pot values were chosen to fit the particular impedance and audio characteristics of the rigs involved. For interfacing to other rigs, general guidelines can be given. The pot should be approximately the same value as the mike impedance. The capacitor value can be experimenta I ly determined for best audio quality. Fig. 3 shows the schematic of...

Kacrk

Nebraska 68504 In Nebraska Call (402)466-8402 a result, the transmitter emitted a signal during key-up periods The emitted signal would gradually creep up in intensity until it reached almost full power. Placing the voltage source in a rninibox and using coax to get the voltage to the power amplifier eliminated the problem. The driving signal is kept from entering the keying circuit by RFC1 and C2. The dc keying voltage is prevent ed from entering the driving circuitry by...

Jt

Grid-block keying modification. C1 20-uF, 200-Vdc e ectro ytic C2, O-,0T-uF, disc ceramic. CR1 200-V, 0.5-Amp silicon rectifier. R1, R2-1-Watt, 20 . R3 Yi Watt RFC -2.5 mH. 71 filament transformer, 1 t V primary, 6.3 secondary at 300 mA. handed, I could find no relay that wa> fast, cheap, fitted the voltage and power requirements, and was available locally. indlly. it dawned on me that there must be a way to key the transmitter without switching the full power of the transmitter...

Bzb

Schematic of the control section. possible to commumcate 220 has finally come to through in any other way Georgia - Bu U in 1 M 30 VAC Supoiv w AM FM CW'SSB-HTTV 60(J8 I larm nics 60dft Serious H vv Duty Desi i1 IflUm+rifited panel Meter A ma tic R Swir hi ng VSWH PrQteciiQd ft i 13V i3 A cceaso r v Soc k y i U.S. Manufeciumd - Bu U in 1 M 30 VAC Supoiv w AM FM CW'SSB-HTTV 60(J8 I larm nics 60dft Serious H vv Duty Desi i1 IflUm+rifited panel Meter A ma tic R Swir hi ng VSWH PrQteciiQd...

Kbk

Basic And Advanced Techniques , Domestic, DX and Specialty Contests Station Engineering for Higher Scores Winners Reveal Their Operating Secrets MAIL THE COLPON BELOW OR FILL OLT THE POSTAGE PAID CARD AT THE BACK OF THIS ISSLE. ORDER TODAY Yes Please rush me_copies of THE CONTEST COOKBOOK (BK7308) at 5.95 each. I Visa Mastercharge American Express 73 Publications Pine Street Peterborough NH 03458 an ASCH keyboard', Simple Graphics tor rninj Lifting surptg* Cgunrerr. tin 1401 Magtc - ne. ta...

Kvgd

EXPORT m tINCOLH AVE CHICAGO ILL *OUt Marc i Leavey, M 0 WA3AJR 4006 Winlee Road Randallsiown MD 27133 Not all keyboards are created equal Depending upon what you are copying, ham RTTY, weather, or press, some are definitely more equal than others. With the interest shown In copying these otherthan-ham RTTY signals, I thought it might be a good idea to review the keytops and symbols found on Teletype machines. My Model 15 manual lists over a dozen sets of keytops used on various models of tele*...

Mfj Super

MFJ-721 SUPER SELECTOR CW SSB FILTER gives 80 Hz BW, steep SSB skirts, noise limiting. CW Filter gives 80 Hz BW. No ringing. 8 poles give super steep skirts (60 dB down one octave from center freq. of 750 Hz). No tunable filter can match performance. 8W 80, 110, 150, 180 Hz. Reduces noise up to 15 dB. SSB Filter improves readability. Reduces splatter, hiss, static, noise, hum. IC active filter has 375 Hz htghpass cutoff 2.5, 2.0, 1.5 KHz (36 dB octave) lowpass cutoffs. Works with any rig. AM,...

Many Important Features

Onjy the Remote 930 gives you so many important features such as call monitor, ring adjust and remote control You can retrieve your messages from anywhere in the world by calling in from any telephone, anywhere, anytime. Sound your coded pocket tone key and hear your messages played over the phone in compleie privacy, The Remote 930 is your 24 hour message center for business contacts, family and friends. Save valuable time and money wheii retrieving messages by remote controi. One phorjs cafi...

M User Report

The Macrotronics MS0 ham interface for the Radio Shack TRS-80 computer includes an interface board and software for RT Y and CW operation. The hardware employs one board which provides access to the computer through the expansion port (an expansion interface is not required). On and off pulses generated by the computer can be coupled by a relay with normally-open or normally-closed contacts (or an acces sory optoisolator for keying RTTY loops , a PNP transistor, or an NPN transistor. These...

Microprocessor Controlled Synthesized Handie

The Yaesu FT-2Q7R Synthesized Handie has all the features you could want in a very compact package 144-148 MHz Range Keyboard Encoded Frequency Entry 10 KHz Steps 2 Tone (Touchtone ) Input from Keyboard 3 Watts Output Keyboard Lock guards against accidental 4 Memories plus Programmable Offset frequency change Priority Channel Odd Splits Can Be Programmed from Keyboard Memory and Band Auto Scan Automatic Battery Saver Feature for LED Display Optional Equipment Rubber Flex Antenna Tone Squelch,...

Mc

All solid-state with wideband amplifier stages. No final dipping or loading, no transmit drive peaking, and no receive preselector tuning Transceives on 80 through all of 10 meters, and receives WWV on 15 MHz. 200 W PEP 160 W OC input on 160-15 meters, and 160 W PEP 140 W 0C on 10 meters tSB, USB. and CW. Digital frequency display (standard) shows actual frequency Backup analog subdial also included IF shift (passband tuning) to eliminate 0RM Advanced PLL circuit, with improved stability and...

Model Hh

MODEL 500 HH . . 169.95 MODEL 100 HH 119.95 The 100 HH and 500 HH hand held frequency counters represent a significant new advancement, utilizing the latest LSI design . . . and because it's a DSI innovation, you know it obsoletes any competitive makes, both in price and performance. No longer do you have to sacrifice accuracy, ultra small readouts and poor resolution to get a calculator size instrument. Both the 100 HH and 500 HH have eight .4 inch LED digits 1 Hz resolution direct in only 1...

Photography

TYK CTTIKG Barbar A J Lattt Svi'J EtodtH S rnj e GtmsJ in Rila fihiwd R burt 9 a her WfJ2GF w Sanger Green Dov IttQmm MTWJ Urrv Kahansr W92NEL Jen.' H aser Bill Paitannk WA6 TF Jc r- S h lU W4FA F-t ni 5NlfK X20AW AOV amiHa Ajina Ccutu. Mfir BJil fort Krtifln fiu arhd Nancy nagging, and other negative means to try to force him to do what you want, you'll tie as successful as the FCC was In trying to force hams to gel the Extra class license. They fiat y refused to do it until the FCC carne up...

Optional

ES-5 aan-display module for Monitors transmitted SS8 and CW waveforms from IB to 150 MHz * High-wnsi iH y, v idrer Utrncry (up to ID MHz) tr.c l Stf pe Monitors received signals in IF stage. * linearity of linear amplifier (provides fcp ioiti pElfcrn) > Aflows oorervaticn of RTTY uning points (cTOs pattern Biiti 4n two-tone ( f Q -H and 157S-H ) n rera O . * Expandable to pan spEay csirafciiiiy for cosiKvmij the mimijEr and amplitude oi stations within a swrtchable 20 Uh 100 kHz bandwidth

Phone Orders

TERMS Orders to U.S. and Canada, add 5 o for shipping handling and insurance to a maximum ol S10 00 All other orders add 10 o CD D collection lee Si.00 Orders under S15 00 add extra S1 00 Handling Regular checks must clear before order is skipped. Florida residents add 4 sales tax police calls on about 1700 kHz, ju& t above the standard AM broadcast band, can remenv ber tuning the beautifully-cab-Ineted Zenith that stood in our living room and feeling the excitement as dispatchers sent cars...

Pin Dip Socket

DIP l( mSERTIOn TOOLS WITH Pin 5TRRIGHTHER Nfcrru*f profflt. Pin * It g hi fc nit ttiii into tool Automatic ejector - .S * V' 1 fl i im Wire for wtr wripifjing. AWG 30 (0 Ftrr n) KYNAR* htrr mm I wi ,'D Tty I - -.-. je K.951 Ifl 3 -Tflt I REPt.ACCMCHT POLLS I S3 I Align* Ptnr out pini Irclud i te itiir tug for Al

Prb I Digital Logic Probe I S I

TERMINALS I 020 TEST POINTS 188 separate 5 pom terminals plus 2 honrontai bus lines of 40 common test potnts each I CM t00 MODULAR PROTOTYPE BOARD S2S 951 TERMINALS 630 TEST POINTS 94 separate 5 potnt terminals. plus 4 bus unes of 40 common test po n s each SIZE 6'W.de 3V*'Loog I CM fX)j V . ' ---.-

Processor Modification

INCREASES AUDIO PUNCH IMPROVES HOCESSED SPEECH QUALITY For the first time, ham operators are finding out just how poorly designed most vertical, omnidirectional VHF antennas really are, AEA university level research has proven that most antennas now being offered create unwanted coupling of RF currents onto the antenna support structure and coaxial feedline shield from the Proper design and decoupling on the new AEA ISOPOLE virtually eliminates the RF spillover problem and can help you achieve...

R

Continuous frequency coverage from 170 kHz to 30 MHz, in six bands Multi-modes AM. SSB. and CW. High sensitivity, selectivity, and image ratio Three-way power supply (AC battenes external DC), with automatic switching from AC to 0C in the event of AC power failure L f*tr+*rUtr m < tmn tur tiutu>

Sm

The SM-220 Station Monitor is capable of various r kT monitoring functions, and performs as a wideband oscilloscope, and is etfpimci* able far pan-display opera- The TL-922A linear amplifier or all Kenwood HF equipment provides maximum legal power on the 150-15 meter Amateur employing a pair of EIMAC 3-500Z high-performance transmitting tubes. MOO H PEP (SSflf lOOD W OC Stfetr nirtectitm (C'w RftV) fnpiii povrfci an tt-15 Rower with dutornatic metHS, with 60 W'drive. ciriaiit Excellent IMD...

Specifications

The Mark radios offer 144-148 MHz range* 6 Channel operation Individual trimmers on TX and RX xtals Rugged Lexan outer case Current drain RX 15mA,TX Mark II 500 mA, Mark IV 900 mA A power saving Hi Lo Switch 12 KHz ceramic filter and 10.7 monolithic filter included 10.7 MHz and 455 KHz IF * Spurious and harmonics, more than 50 dB below quieting Uses special rechargeable Ni-Cad battery pack LED battery condition indicator Rubber duck and one pair Xtals 52 52 included Weight 19 oz. including...

Snn

Bo* 981 Farmingdale NY 11737 Yes Sign me on as a Charter Subscriber to 80 Microcomputing for Si 2 (half the newsstand price) and send me your giant book of 80 Microcomputing programs FREE I2issues 12 36 issues 36 Payment enclosed Please bin me Bill my Master Charge Visa Canada S I 2 per year U.S. funds only. Please add 2 per year for Canadian currency. All foreign subscriptions 26 one year only, payable in U.S. currency.

Tail Safe Design

Advanced computer technology, unavailable until now, has been deigned into the Remote 930 The specialiy engineered microprocessor has been programmed to recognize user mistakes and aufo-maiicalty correct them. For example, when the incoming message tape is full, some systems will not answer the phone. This means you would nor he able to access your system to retrieve calls. I iowever with the Remote 930. when an incoming message tape is completely lilted, he machine win allow you to playback...

St

Up down manual scan and repealer or simplex operation from 143.900 to 148 495 MHz m single or fast continuous 5-kHz steps Two lock switches to prevent acc& enial frequency. change and accidental transmission Subtcne switch subtone motfute m KeJiwood upphe ). High-impact piastte case ami imc tfee-as traffic Stated accessories irrCioded wi& the -2400 are a fieviole rubberised antenna with BNC connecter. -c .(satter Model Stt base stand. wt dt provides 15-hour quick charge, trickle charge,...

Start Enjoying Meter Fm

80 chan. 10M transceiver complete, ready-to-operate (with addition of 12VDC and antenna). Freq. synthesized (28.9-29.7MHz) in 10KHz steps. Outstanding receiver w MOSFET front-end and filter in I-F. Repeater off-set kit available. Donoiii K. Reynolds 6365 Beach Drive 5, W, Seaft e WA 98136 shedding some light on the workings

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He purpose of this article is to correct some widespread misconceptions about antennas. These misconceptions, as will be explained later, are not confined to certain users of an- tennas, but evidently extend to some of the manufacturers as well. Unfortunately, there is a widely-held belief that antenna design is a black art. While I do not wish to undermine the livelihoods of those well qualified antenna engineers who thrive on perpetuating the notion thai the operation of an antenna is...

Swl

Countries Use alt amateur bands from 80 lo 10 meters. Operating classes include single-or muiti-operator single transmitter, and SWLs* EXCHANGE MESSAGE RST. number of the QSO, and continent. SCORING Score 1 point per 80 or 40-meter QSO. 2 points per 20-meter QSO. 8 points per 15-meter GSOh and 12 points per 10-meter QSO. No points or multipliers lor contacts with ones own country, Only 2x RT Y OSOs are valid. Each si a-lion may be contacted only once on any band additional contacts may be made...

Transmitter

Carrier suppression Better than 40 dB Unwanted sideband suppression Better than 40 dB (14 MHz, 1 kHz modulation) Other spurious radiation Better than 40 dB down Third order distortion products Better than 31 dB down Transmitter frequency response 300 2700 Hz (-6 dB) Antenna output impedance 50-75 ohms, unbalanced. Microphone input impedance 500 600 ohms (low impedance) Note FT-101Z (analog) cannot be used with the FV-901 DM, as there is no frequency display.

TR

Covers 445.0-450.0 MHz (transmit) and 442.0-447.0 M Hz (receive) 23 channels. Ihiee supplied (446.0 MHz simplex, 446.5 MHz simplex, and 44910 MH transmit 444 10 MHz receive). Five-section helical resonator and two-pole crystal filter In receiver IF. for improved intermodulation characteristics. Call channel switch, tor user-desired function (such as lubtone). High- ow power switch (10 W t W) Monitor circuit. to allow listening to modulation while making liwpienqf adjustments. The TS-700SP is...

Ttc Touchtone Control Board

3 digit ON, 3 digit OFF control of a single repeater function Or, 2 functions 2 digits ON each with 1 digit (each) OFF Can be used to pull in a relay, trigger logic, etc Typically used for Rptr. ON OFF, HI LO Pwr . P.L. ON OFF. Patch Inhibit Reset, etc. Stable, anti-faising design. 5s Limit on access 85.00 ( 125.00 inst. & ckd. out in SCR1000). 2 Function or Custom Programming - + 15.00 For Add' Functions)-Add a Partial TTC Board. 42.00,

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Prie ftnd specification subject to Chang* without notice Prie ftnd specification subject to Chang* without notice EDITORIAL A J 5TANTJ EJUwbftir i cfc-Kjri Jrih i Mit h RJcfi d Pfier x Hed fi C tJ Jad n Ken JacM n D*in Owens SA rtW PaHtfl ScrJttfier iotin w White Polor Pt rm Emlly A. Tj ,i)3 Cnr-ri Brown

Vol

Tion of the input pulse, greater than 10RC. This is written trf > 10RC. Look at Fig, 4, Assume that the pulse is at + V, S1 is closed, and S2 is open. C is, therefore, charging through R and the meter Now assume that the pulse has passed and the input is at 0 volts. This is the same as saying that we have a wire connected from the capacitor to the ground wire. At this time, we also open S1 and close S2. This completes the discharge circuit, and C discharges very rapidly because the discharge...

Wind

Direction in tens of degrees from nonh, speed in knots Example 3627 - SfiOdegrees, 27 knots RVR is reported fr im some station Extreme values lor ion minutes prior to observation are given in hundreds ot feet. Runway identification precedes RVR report. The first figure of the actual altimeter setting is always omitted front the report. COOED PILOT REPORTS Pilot reports PtREPSj of douds no visible from grotirxl are oded with MSL height data preceding and or foilowing sky cover symbol 10 indicate...

Whip

Typical whip with base tuner connected to a coaxial line. same magnitude of current which enters the base of the whip must also spill out over the car body. If the antenna is mounted at a point of symmetry, ideally at the center of the rooftop, current will flow radially out from the base of the whip, as in the case of a vertical broadcast antenna system The car top is an elevated ground plane of finite size. The radiation pattern will show only minor variations in azimuth, but the...

I

M ALLIANCE Manufacturing Co, Inc., Alliance, Ohio 44601 I Umkm of famou Anttnni Rot lor . AlUanc* T nn* flotor* 'TV t *lt r Colof Q lt r i V. i J i * . t, A i.y r i, 4 , , - K , V. i J i * . t, A i.y r i, 4 , , - K , Weils R. Chapin W8GI Byron H, Kretzman W2JTP Steve Baumrucker WD4MKQ I refer to W2JTP+s comment to W8GI in the August, 1979, Letters section regarding the ARRL and the Intruder Watch. I do not think that you are correct about the ARRL coining the word intruder and establishing the...

Address Qf Pictcrf

IN CmAft SAVt IN SAVE ESS Of CHAR AC TEA WVE FDR ySE LATER 9 CMARCATE S LI Nt SAVE IN BVTE1 FINFJ ADORES5 IN BLJfFER CET CHARACtt* < *SCTI CfiOfI SET UC FOR NEXT CFAflACTER STCRE ADDRESS flNC ADDRESS f3FPlCTuRE 0015 LCAC C MiR ACT FR C0T5 IN A B'JFFE LOAD DOTS IN PlCTCRE BVIE COUNTS* FOR LAST BYTE GET CHARACTER AC08ESS IK PICTURE 14 TOTS FOR A CHARACTER SPACE aDO 14 TO *

Cmmunica Tions

Handi. 3.75.PA residents add 6 tax) Send for Data Sheets Norristown, PA 19401 (215)631-1710 Alexander MacLean WA2SUT NSN0VB 18 Indian Spring Trail Denville NJ 07834 When it was intro-_ duced, the FET was billed as the transistor that thinks it's a tube. There's been a lot of current through the gate since then, but there are a lot of similarities. It is one of the few transistors that does give a hard-line tube man a fighting chance at making it work. There are a few basic differences....

Oio

The switch is closed tor normal operationt open for extended frequency operation, (See re*ij fee. but, although this is a reasonable fee. it easily could have cost me more than for the rig itself. Not easily discouraged, I sent a letter to Royce requesting information on the PLL unit i received a brief, but polite letter informing me that the unit lion was available. Being told this was enough to prompt me to tear into the unit and convert it myself. The project turned out to be...

Johnson Viking 352d

Ere it comes folks, another CB rig converted to ten meters the Johnson Viking 352 This rig has a great deal of flexibility when properly modified. It can offer more features than the average CB-to ten-meter conversion, and this means more QRP contacts for you. The 152 is an SSB AM eleven-meter 23-channel transceiver. The logical place to convert it seems to be 28 5 MHz to 28 8 used at the lower end and the AM section will cover the upper end where there is activity in this mode. At this point,...

Top Quality Frequency Counters At Pace Setting Prices

Note Model K-7000 is available KIT FORM only, other models factory assembled only. Model K-7000 requires AC-70 Adapter 4.95 for 115VAC Operation, AC Adapters are included with the other models. See chart below for NI-CAD Battery Pack Option, etc. Note Model K-7000 is available KIT FORM only, other models factory assembled only. Model K-7000 requires AC-70 Adapter 4.95 for 115VAC Operation, AC Adapters are included with the other models. See chart below for NI-CAD Battery Pack Option, etc.

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FEB 72 SoUd lt Stvtt High Frequency Regenerative Receiver el cheapo us ng ortf tC Tip , lor Rimng Your Ci i lt ' Si lt 3 to 20 WPM Why Not TrY GRP VHF Dum- y toad WurtiT r cw 0 On 7j Watt enfOyOfiPwimihist-WaMngiitHiOW 1-4 Sand TX two-tube CW transmitter, Omc a n d a ay Pfi H Tr .mi ni o Sor J er. Sett-Contained Reflected Power and CW Monitor Circuits. Circuits, CJrcuils Th Automlk TfaniTr.Liiii.on Ltnr Tun r may 72. Qurtnt Change Motiilo An tenna witb output ndiciilo Ho loQ-.l he SVi riin the...

Coaxial Feed Lime

Hg. 7 2, A coaxially-fed, sleeve-decoupled 1-1 4-wavelength center-driven dipole. robbing the hams of rf power for years, Some representative measured radiation patterns of whips showing the effects of radiation from the codx line are shown in hg. 7 The azimuths pat tern of a vertical whip is necessarily omnidirectional 1 he radiation pattern in the vertical plane is most easily measured by supporting he whip hori on tally above a turntable, and rotating it in the horizontal plane at a fixed...

Gpo Bookstores

Main Bookstore 710 North Capitol Street Washington DC 20 02 202 -275-20 1 Atlanta Bookstore Hm. 100, Federal Bldg, 275 Peachlree Street, N H Atlanta GA 30303 402 -221-6947 Chicago Bookstore Rm. 1463, 14th floor Everett McKinley Dirksen Bldg. 219 S, Dearborn Street Chicago iL 60604 312 -353-5l33 Dallas Bookstore Room 1C50, Federal Bldg. 1100 Commerce Street Dallas TX 75242 214 749-1541 Houston Bookstore 45 College Center 9319 Gulf Freeway Houston IX 77017 713 -527-5453 Los Angeles Bookstore Rm....

Dur

T M F F 9 r K I H HFtyj Lh A L F R E L OF thifllCTFu eiJFFi G- f L K fi IIMPLF T S H PCl Ct r r K FITR A V CfWftAf. TEft IF Y PR A t E F E A iFlf Tf N JT CLtJ JKtfrihtR r k, i Flit fh ne cil PL. r 5VAC JFT h ft RHF C attiteis Of limf jkvip Table 1u m ple et ht hy seft fft l HEJC If 1 TDOF IF S TA A gt fthr AD H SS OF LIMF H i CTETR of LfJJ uithmfldm t S1 t tFT K HEM LimF fi tHJK M P tTUPE Il K ltlT gt T IF t IRIA-Ch VU AESIUMIM program works would be very complex and take many pages As you can...

New Uhf Transmitting Converter From Hamtronics

Hamtronlcs, Inc., has done it again In the tradition of other fine products, they have a new UHF transmitting converter, and just in 'me to gear up for the new OSCAR Phase III. Oe signed to convert 28-30 MHz to 435-437 MHz or 432-434 MHz, the new model SV4 requires 1 mW to V2 W of drive to give 1 W PEP output on SSB or up to 1 M2 W on OW or FM. If you have one of the older 10m exciters which doesn1t have a low power trans-verter output, don't worry, because instructions with the XV4 tell you...

Decoupling Sleeve

Fig 8 Half wave whip with quarter-wa ve decoup ng sleeve Fig 9 Current distribution on a sleeve-decoupled halt wave whip. Fig. 70. Sleeve-decoupled half-wave whip designed for marine VHF use Fig. 70. Sleeve-decoupled half-wave whip designed for marine VHF use Fig, 7 J. Currem distribution along 5 8-wavelength whip with 1 4-wave decoupling sleeve,

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MJ 48078 T64 Phone Orders Call 313 286-4836 Improved reception. For receivers and transceivers. Continuously tuneable 1.8-54 MHz. Covers all amateur bands 160 to 6 meters all shortwave broadcast bands. Low noise figure. Up to 20 db gain. Reduces image and spurious response. Here is an exciting new device to improve your reception on all bands 1.8 to 54 MHz. It gives up to 20 db extra gain and the fow noise figure of a dual gate FET to pep up your noisy receiver or transceiver. And...

At Discount Prices

Yaesu Drake ICOM Dentron Tempo Midland E.T.O. Wilson available were extremely helpful to me, and can serve your needs aiso, if you are in search of additional study or reference books to place in your home or club library As a convenience to the reader, I present an abstracted listing of US Government publications of general interest to radio amateurs. Shown in the listing are the document title, publication date, number of pages, CPO stock number necessary for ordering , and current selling...

Regency

Communications Electronics the world s largest distributor of radio scanners, is pleased to announce that aN Regency brand scanners areon saleduringourworld's biggest scanner sale. Even the new Regency models K500, Ml 00 and R-304 are on sale, ff you don't own at least one scanner, your missing ali tha action of police, fire, marine and government transmissions, Since you can monitor most business or government broadcasts in your area, it's like listening to a party line full of vital...

Sstv Robot

PUT YOURSELF IN THE PICTURE Get in on the latest in Ham Radio' CALL OR WRITE NOW FOR PRICES' Get on Frequency Write or call for special price larsen - hustler - avanti SPECIAL Cushcraft ATB34 220.00 Delivered anywhere in the Cont U.S.A. HAM IV Rotor with 100 ft color cable 1162 00 rotor cable and first grade RG0U S 185.00 The fantastic new Avanti 2 meter Mobile Antenna-mounts on your car window glass 3 DB gain. Neat and compact installation SPECIAL PRICE 30.00 Please send Cashiers Check or...

Bvz

B - gt 4 Phoenix D Box 10 2 J Ann Amor Mithigen 461 Q amp U.S.A Celt TOLL-FREE BOO 531-441 Avt aut i4 U S A 313 S04 4444 Other Phone-mate Remote 930 Features Exclusive C-VOX Controlled Voice Activation means your callcr has time to leave a long or involved message As long a amp C-VQX recognizes the sound of a voice it will continue to record, making it ideal for detail edjo borders or messages Remote Control Feature Hear your messages ptayed back over the phone from any phone, anywhere by...