Marlborough Ma

The Algonqum Amateur Radio Club will hofd its annual flea market on Sunday, February 201 1983, at the Marlborough Jr. High School, Marlborough MA. Admission is 31.00 and children under 12 will be admitted free. The doors will open at 9 00 am for dealers and t0 00 ifll for buyers Refreshments wits he availabte. Tables reserved before February 12, 1963, are S7,00 any remaining tables will be 10.00 at the door. Talk-in on 146.01 .61 and 146.52. For table reservations or more informalion. contact...

Bbw

Pro ramrning, atong with a couple of TVT construction projects. ASCII, Baudot, etc, Tftis book bas the higt recommandations as a toachinq ard. BK7322 2.47. TEXTEDIT A Complete Word Processing System in kit iorm by Irwin Rappaport TEXTEDIT is an inexpensive word processor that you can adapt to suit your needs, from writing form letters to large texts. It is written in modules, so you can load and use only those portions thai you need. Included are modules lhat perform right justification, ASCII...

All Band Trap

Malic Self gtion with proven Hi-Q Traps. 3 Modeli-AL L self supporting - Ground or roof mount- HEAVY Double wall scamlesi Aluminum tower lecthon - HI STRENGTH FIBERGLASS TUBING OVER -ALL. NO WOBBLY, LUMPY TRAPS - NO UNSIGHTLY CLAMPSl needed - Same size all the way up 1 - Traps hidden Inside You can use it in a 1 ft, sq. Backyard Neighbors wOl never know thd a a Hi-Power ALL Direction OX Antenna. FOfl APARTMENTS. ROW HOUSES. MOBILE HOMES - CONDOS etc. where mm-, imum space and neat appearence is...

Facsimile Weatherchart Recorder By Alden Electronics

Remember the old adage Everyone lalks about the weather, bul nobody does Anything about it Well, itiat's not quite irje II it ever was and Aiden Electronics oi West borough, Massachusetts, is surely proof that somnborly m ally does do something about the weather They have Introduced a facsimile weather-chart-recorder Kit tor the home hobbyist and ham. Specifically. Aiden Electronics is one of the world s largest manufacturers 0f radio lacsimile receiving and recording equipment equipment thai...

World Time Watch

The first microprocessor watch made especially for hams The HAM 1 functions include local tcme, world ime, (G.M.T. tool count-up and count down chronometer, day, month, date, alarm and houily chime. Its I deft I for log-keeping, DX timy conversion and 10 minute I D. timing The HAM-1 fed lures a high contrast Seiko display and soiar ceil battery assist Battery life is better than 4 years. The HAM-1 is water resistant *o '20 meters, the case is lOCr-j solid stainless steei and the crystal is...

L

Improve your system quality with the EFH-75 Microwave Feed, It offers precision polarity selection using the attractive control shown here, fNSTALLATlON FEATURES 1 JO ft of 3 conduct ur wir mcludmJ TERMINALS Sttachtd at e h ond * NO MORE SPLICING Molded terminal posia on motor cover Painted pari prvvonlft corro Lon ON-OFF switch on contrcH box - Powar-on Itghl on controi bo - All rtecassary hardware jncluded fNSTALLATlON FEATURES 1 JO ft of 3 conduct ur wir mcludmJ TERMINALS Sttachtd at e h ond...

Qsl Of The Month

This monirrs winning QSL from Roger Schulli MG0P la the result oi a family effort Roger's XYL. Dtane. designed ifid slltcbed the original needlepoint for the card Her work then was reproduced wilh a clarity thai permits you ro couni The stilchcs, giving the irnpres' sion oi depth to the QSL card, The variety oi stitchFFS she used keeps the eye busy, and Ihe horde* surrounding the design gwes (he card del ml Ion lhat many olher cards lack. Tc enter QSL of Month Contest put your OSL card tn an...

Canadaward

TriP Canadian Amaieur Radio Federation is pleased to announce ihe following awards available to all raoio amateurs worldwide A colorful certificate will & e issued to any amaitur no corrhrmi 'wo wa, contact wiith ail Canadian provinces and tern-ton ea AK QSOs must be on on e band only Separate awards are issued for eacr band on which the applicant qualilies Canadian provinces and territories include V01 V02 Newfoundland Labrador VE1 Prince Edward island VE1 NovaSco-lia VEl New Brunswick....

Kilobaud Klassroom

Mukra learning electronics fun and easy. First published as a series in Kitnbaud Microcomputing l*> r)k combines the learning c> f essential theory with practical, hands-on experience. The course begins with basic electronic project and culminates in the construction of your own programmable microcomputer. The direct instructional methods of authors Young fit Stark make KILOBAUD KJ A5SBOOM a simple way for you to acquire a solid background In digital electronics. BK7386 (419 t jro DijjLlul...

Cook Books

THE RADIO AMATEUR ANTENNA HANDBOOK-AI about wire antennas, beams, tuners, baluns coax, radios. SWR and towers Clear and complete informa.-tion. bk1199 6.95 vhf HANDBOOK FOR RADIO AMATEURS Contains information on fm theory, operation and equipment, vhf antenna design and construction. satellile-EME, and the newest solid-state circuist. BK1198 6.59* ttl COOKBOOK by Don Lancasier. Explains what TTL is, how M works, and how to use il Discusses practical applications, such as a digital counter and...

Resistors

I welcome any comments, and I will reply to any questions when an SASE is enclosed, 1. Howard Knickerbocker K1 DCS. Andrew Weise N1XN, and Robert Stielau W1WRO, CB to 10 FM best conversion yet M, 73 Magazine, January, 1980, p. 117. Full Servrce Shop *SRectrum Analysis * Antennas New and Used Equipment CW-SS -FM, Etc. Towers FCC Study Guides Code Tapes *flooks Accessories Specialists in Amateur Radio, Short-Wave Listening And Contemporary

Tenn Wireless Assh

Ham Radio 1964 World Fair

Operators from throughout the US and many foreign countries stopped by to operate the station. A commemorative certificate and QSLs were available from the Tennessee Wire ess Association. tered for the sole purpose of sponsoring an amateur radio exhibit at the fair. Under TWA president F d Dunn W4NZW, the group's first order of business was to approach fair officials aboul obtaining a site tor the station Virgil Davis KA4RPA, a IWA officer, talked with Knox tlle mayor Randy Tv-ree and secured a...

MFJ

Up to 3 ICW PEP and it matches any leetfJine, 1 8 30 MHz, coax, Dalanced or random. 10 amp AF ammeter assures max. power ai mm. SWR SWfl Watlmeier, lor. rel , 2000 200W IS position dual inductor ceramic switch 7 pos. art switch 250 pi 6KV cap 5 14x14 300 wart dummy toad. 4 1 fertile balun. 3 MORE 3 KW UOOfeLt MFJ 961, 5239.95 f t0 . like 984 less ant. switch, ammerer MFJ 239.95 510 , like 9fl4 less am meter, SWWWattmeter, MFJ 960. 209.95 t0 . Jike 962 less ant switch, Flexible antenna switch...

Handheld Countertimer

Global Specialties Corporation announces the new Model 5000 Counter Timer. h is the first portable hand-held Instrument of its kind The 5000 combines all of the Important features and perfor mance capabilities of ft btmch-lop unit with irie convenience of a iuHy portable, battery opiated Instrument The 5000 measures 7 6 x 3.75 x 17 and weighs In atUoL wnnout batteries . As for performance, the 5000 is designed to measure frequenc gt period, and pulse wtdth with extren- accuracy and except...

Butternut

Any new equipmeni ordered from us c n ne tesietf jncj proved tjy our factory trained technicians prior J shipment you requeS rt Tt h requires opening the do gt Dui me technicians approval Csvo AIM De encfosec ii LH' on Houatt n i e e ndn . -n P-Lt -nbjffLl rH ri0fc without rlolntr dit lieTIS IJIM' nnifeo WW Jtertis SJibjtfr-1 prHOT Tenas fPSi 1i-nl-iri lLl faK titease .iriLi MjtliLipnt imsum batanea cnllt-n ii LH' on Houatt n i e e ndn . -n P-Lt -nbjffLl rH ri0fc without rlolntr dit lieTIS...

The Icom R

The Icom R70 fs a general-coverage communications receiver covering a frequency range- of 100 kHz to30 MHz. Newly introduced to the market IE made me anxious to review it and share my impressions. As wilh mosi hams, I could not resist the urge to unpack the radio and begin using it immediately without, of course, reading the instruction manual. It Is because of this ease of use that I have such good things to say about ft The IC-R70 has a front panel that is both uncluttered and functional All...

Putfut

AH unmarked resistors are 1k Ohms. All are 5 volts. All diodes- 1N4148. well described in past 73 Magazines I will only deal with this digital-scanning frequency selector. This circuit will give you direct frequency readout Example 60 29 60 MHz, and so on. There are 40 channels available at 10-kHz increments with a repeater offset for 20 of these channels, A squelch-operated scanner allows you to search the band without lifting a finger. The crystal in the radio...

Transmitters And Accessories

HELICAL RESONATOR FILTERS available separateEy on pcb w connectors. HRF-144 for 143-150 MHz 34,95 HRF-220 for 213-233 MHz S34.95 HRF-432 for 420-450 MHz S44.95 T51 VHF FM EXCITER for 10M, 6M. 2M 220 MHz or adjacent bands. 2 Watts contin uous. Kits only 59,95 R1 44 R220 FM RCVRS for 2Mor220MHz. 0.15uV sens. 8 poie xtai filter amp ceramic filter in i-f, helical resonator front end for exceptional selectivity curves at teft . AFC ncl., xtai oven avail Kit only 119.95 R451 FM RCVR Samebutfor uhi...

M

Nm i 11H W H Sl ' D Un r io bi immmu'n ShA M gt nm i 11H W H Sl ' D Un r io bi immmu'n ShA M gt Gray t ijrt w4n S f l-i-Jrtfl tflMt n P SS Tintmri LI'4 IlliMMl 'PiJ Gray t ijrt w4n S f l-i-Jrtfl tflMt n P SS Tintmri LI'4 IlliMMl 'PiJ Wdlnpmr T-9 '2-49 J - Hi Up 1.89. WK VCJlufni CHhULii wiih DPFT wititn . I1.J f -Up 1 1 lOKTrujmtiwMiHiJmuh

Introduces The New Sa Smart Patch

The State of the Art Simplex Interconnect Communications Electronics Specialties introduces the CES 510SA Smart Simplex Autopatch, with many important new features never available before Three digit control codes with user programming. A sophisticated toll restrict provides positive long distance lock out, Time-out and COR actJVity timers with warning beeps and digital programming, Rotary or DTMF dialing. Phone Irne in-use detector prevents Hf interrupting a call in progress, and sends unique...

Aes Branch Stores

Bfo 455khz Circuits

Ohio 44092 28940 Euclid Avenue Phone 216 585-7388 Ohm WATS I-800-362-0290 ORLANDO, Ha. 32803 621 Commonwealth Ave. Phone 30b 94-3238 Ha, WATS MQO 432-9424 CLEARWATER, Fla. 33515 LAS VEGAS. Hev. 89106 1898 Ore Street Phone 813 461-4267 No In-State WATS SS 1-800-327-1917 No Nationwide WATS 1072 N. Rancho Orive Phone 702 647-3114 No In-State WATS CHICAGO, Illinois 60630 ERICKS0N COMMUNICATIONS 5456 N. Milwaukee Avenue Phone 312 631 5181 A good bfo will bring your receiver performance up...

With Data Sheet

NE57835 2SC2150 Microwave Transistor Ft Gain Bandwidth Product at Vce 8v, Ic 10ma. GHz 4 Min, Vcbo 25v Vceo 1lv Vebo 3v Ic 50ma. Pt. UNEIXO RF Power and Linear Amplifier Capacitors These are the famous capacitors used by all the RF Power and Linear Amplifier manufacturers, and described in the RF Data Book.

O

Frequency counter board component layout ing of SSB transmitters using a twotont test signal to approximate a speech signal if you have an oscilloscope cr modulation display monitor, the transmit-termodulation wavefora can easily be monitored and the modulation level set to get the maximum PEP peak envelope power without distortion or flat-topping of the audio sig nal The four-tone audio oscillator described here es an excellent piece of gear to use for these tests since trom two to...

Semiconductor Supermart

GARVEY AVENUE WEST COVlNA, CALIFORNIA 91790 213 967-4611 213 967-3846 1tu v' S tisr O Ativerfisers on page J M Dave Schmarder N2DS 11 Beaver Avenue Beaver Dams NV Converting a Hy-Cain board to 10 meters is only half the story. Try adding a digital readout and scanning capability. . Have you been bitten by J the ten-meter FM bug Do those Hy-Cain CB boards look interesting Here is your chance to do a little bit of building and have a lot of fun Since the actual rf conversion of the...

Heavy Duty Inflatable Boats

Viking ind will send any oi the above slie boots to ijny reader ol this publication ho reads and respond la this program Delore midnight February 26 Each bodt is constructed oi lough, high densiiy labrlc resistant 10 abrasion, sunlight, salt, amp oil , electronically welded embossed seams, nylon solely line grornmeied all around heavy duty oar locks three sepo'die ou chambers lor e tro safety, self locking safety values Dow lifting and lowing handle, and are recommenced fcjf marine, ocean, and...

Xpn

Bfo 455khz

Schematic diagram of bfo and detector circuits. 56 73 Magazine February, 1983 The bfo control labeled Rt T is mounted where the sidetone level pot used to he. That control no s called MONITOR to save space 5 mounted just below and left of the meter. The oscillator coil is fashioned from part of an old tube-type i-f transformer. At first, a miniature 455-kHz i-f can was used as the tank circuit, but the thermal stability was terrible Simply placing a fingertip on the side of the shielded...

Va

Power transformer is Radio ShacA 27 J-757 i or receive-onJy, substitute 273-1515. trolled oscillator vto tunes from 114 to 145 MHz with a l-to-4 8 V-dc control voltage. There are two common-base isolation amplifiers one feeds the vco to I ho balanced mixer and the other, coupled through a 20-dB coupler, buffers the output to the divider chain Since thedesjred frequency steps are in VMHz increments, the 10-MHz crystal-controlled reference cs divided by 10 to...

T

We're changing what repeaters can do forYOU RC-850 Repeater Controller The New Standard in High Performance Whether you re a repeater owner, control op. or user, the RC-850 controller offers you capabilities you ve only dreamed of. Like natural sounding speech synthesis - . easy, remote Touch Tone programming talking meter readback,. synthesized remote base operation , and an autopatch with features you have lo hear to believe. Most important of all, upgrade through software, prevents...

Ham Help

TH7DXS 7 element tnbind tot -4 374-00 TH9HX2S 5 element trifcind b a --309.00 TH3NK3S 3 element tritund be --215.00 TH3JrS 730WPSP3 el tnbender --J56.00 TH2MK3S 2 clement tnbind beim --134.00 TiW to TH7DIS conversion Kit --135.00 205BAS 20m 5 element -Lang JohrT --292.00 I55BAS J5m 5 element Ion John' --175,00 J05EAS 10m 5 elementLong John----- 114.00 14AVQ WBS 40-i0ffl trip virtictl --51 .00 VtS 2m coJme r g m verticil---37.50 BN-86S Beam mount 1 1 tulun -----I 7,00 HG-33MT2 Side supported -...

Mfj Rf Noise Bridge

Lets you adjust your antenna quickly for maximum performance. Measure resonant frequency, radiation resistance and reactance. Exclusive range extender and expanded capacitance range gives you much extended measuring range. Exclusive range extender Expanded capacitance range Series Bridge This MfJ-202 Rf Hoise Bndge Jets you quickly adjust your single or multiband dipote inverted Vee, beam, vertical, mobile whip or random system tor maximum performance, Telts resonant frequency and whether to...

Radio Modem

TtRViSALL 4 4 h pdwm and h hm ayitETi vrfi4ch PmortaT C fT gt - Ou tf nrtta 4 sra-r. jt n eqfW irwMfcm MiMte a ttrhnot Wftu uncnm ton Act nSBS vcpuente tsntfUH M- - -Vt-- 4 wcrdrrccfeeii F M TtRViSALL 4 4 h pdwm and h hm ayitETi vrfi4ch PmortaT C fT gt - Ou tf nrtta 4 sra-r. jt n eqfW irwMfcm ende ci mfrj Ii H mo tw OV f , nfl V ty etui Ar- - -i. COflrt JC .ir lt J t J K Umifcanon ftoa unmers. tB w orae woe T-JlVl ailCTTlllK ilyu Pi f uarrawu v-- ji-ni HJ1 ' ,-v Moiffi Igornt n cx fn-- it-- f...

Selfreset Powerline Interrupter

Electronic Specialists expands its Ac Power-Line Interrupt series 10 include automatic rase models Should ac line voltage be disrupted or exceed preset safety flmits, the Power Interrupter disconnects ac power from conlrolled apparatus. A 4-minute time delay, followed by automatic self-reset, helps avoid wide voltage fluctuations associated with power line maffunc-llons, An optional line voltage monitor Is available. Intended for Installations operating unattended for long periods, the Selfre...

Communications Design

1105 Lehr St - West Memphis, Arkansas 73301 New Technology patent pei converts any VHF FM receiver into an advanced Doppler Direction Finder. Simply plug into receiver's antenna and external speaker jacks, Use any four omnidirectional antennas. Low noise, high gain for weak signal detection. Use serial AFSK option for remote display or tape recording data. Kits from 270. Assembled units and antennas also available. Call or write for full details and prices. DOPPLER SYSTEMS 5540 E. Charter Oak...

Highresolution Sstv Converter

Mlcrocrafl Corporation has announced the new Videos can 1000, a high-resolution SSTV converter, Although the converter is compatible with amateur standard and flrst generation SSTV equipment, the Videoscan 1000 also has two high-resolu- t on modes producing 25 amp line pictures with 256 pixels per hne The convener's pixels are quantized to 64 levels of gray and it features a built-in gray-scale paitem to use In seating controls as well as three scan rates for optimum versatility With the...

Microcomputer Books

THE SELECTfllC INTERFACE by George Young. You need Ihe quaSity print lhat a daisy wheel printer provides out the thought o'f buying one makes your wallet wilt. SELECTFIICTM interface, a step-by-step guide to interlacing an IBM Selectric I O Writer to your microcomputer. will give you that quahty at a fraction of the price George Young. Co author of Kilobaud Microcomputing magazine's popular ''Kilobaud Klassroom' series, offers a low-cost alternative to buying a daisy wheel printer. selectric...

Select Your Favorite Feature

Yes, the CT2100 has the features you want - and built-in, too The CT2100 has been designee by the RTTY people at HAL for optimum operator convenience. No hidden keyboard controls to remember - it's all on the front panel, arranged for serious operators. Why settle for a compromise or imitation when you can have the CT2100 Compare feature for feature you'll find that the CT2100 offers the most performance and flexibility for your dollar. Send or receive ASCII, Baudot, or Morse code RTTY and...

From Easter Island To Christmas Island

The Pacific adventures Ol DXpeditioner Eric Sjolund SM0AGD were mentioned in the August. 1982, edition ol this column The saga of how a copy ot mat column caught up with Enc reflects the hectic nature of his recent six-month journey Fellow Swede lt SM5HtH and how s Thar for a CW catisign' picked up a copy ot the Auflus 73 while his ship A at m Housien SM hih sen ihe ariie 1o Enc Eotwrg WSDO who maintained dni schedules with SMOAGDas thf lattef f d'lhePacif ic W6DU fired the column olf 10 Eric...

The Palomar Engineers Pt Antenna Tuner

The true test of a race oar ison the long Track in Indianapolis, and the strength of a dune buggy is discovered n tho heat of the Ba a desert. So, to test she Paiomar Engineers PT-407 anienna luner, I put i on the fir t floor of a brick apariment buildiny, with a random-wire antenna and no earth ground. In an apartment, all of the possible problems of operat ing a station become a reality. Antenna space is extremely limited. TVI problems are multiplied by the closeness of neighbors, and the...