Ts Audio Oscillator

Frequency range 20 to 200,000 CPS in four bands, ou tput imp. 1 000 obrns. amp liiudes continuous vartabte 0 10 volts Freq. response 20 CPS to 150,000 CPS approx. 1 OB, F req, accuracy stability 2 H um GO DB be low rated output attenuator accuracy 3 except 10 Micro. V i 2 or 3 M icrovolts. Power input Vr 50-1600 eye. Output 100 MW, With nine tubes, calibrated tuning iial, freq. range swttch, output level cont. output level attenuator, signal input and output jack, output level meter, vibrating...

Features

Ft Built-in VFO (Frequency converted for stability) AM and FM both crystal and VFO Four transmit crystal positions (8 MHz) High level transmitter modulation on AM Bandpass coupled transmitter requiring only final tune and load Three internal transmit crystal sockets with trimmers for netting * One transmitter crystal socket on the front panel 146.94 MHz crystal included ft Crystal controlled first conversion ft integrated circuit limiier and discriminator for FM Envelope detector and series...

Specials

Color TV crystal (3579, 545 KHz) wire leads 100 KHz frequency standard crystal (HC 13 U) 1000 KHi frequency standard (HC 6 U) Any CB crystal, trans, or rec, (except synthesizer crystals) Any amateur band crystal in FT-243 holders (except 80 160 meters) A SPEECH COMPRESSOR im REALLY WORKS Fully wired & tested. NOT A KIT Internal units & modules work mobile. (Illinois residents add 5 Sales Tax) Write for specifications and information sheets (Free). D monstration Tape (cassette) available (...

Nj Amateur Of The Year

Butterhof K2JOX, was presented with a plaque and cash award in recognition of his many years ol service to ihe southern New Jersey area hums. His dedicaUon to ham radio has been demonstrated main times over the years. He has served as president and member of the Hoard of Directors of the Southern Counties Amateur Radio Association, has served onany committees, participated in many SC ARA activities and programs. In L*7 he organized several transmitter hunts, promoted club activities, was prime...

New Transceiver

KM transceiver offering the operating features and quality performance that FMers have come to expect on lower frequency bands. The 2 ler provides automatic panel selection of ten primary crystal controlled transmit receive channels and secondary continuous tuning ot the 220 MHz FM band. The 2 ler provides a conservative ten watts output combined with a .25 liV receiver with the ruggedness and reliability of an extruded frame and die cast panel structure. Scheduled for production in June, the 2...

Circuits Circuits Circuits

The following circuits have appeared in the referenced books* magazines, application notes> etc. While we try to reproduce all of the information that should be needed by an experienced cons true lor, readers may want to avail themselves of the original sources for peace of mi fid. Readers are requested to pass along any interesting circuits that they discover in sources other than LIS, ham magazines. Circuits should be oriented toward amateur radio and experimentation rather than industrial...

Columbus Georgia Hamfest

Ihe fourteenth annual ColumbusT Georgia, hamfest will be held on April 1972 at the Fine Arts Building behind the Municipal Auditorium at the Fairgrounds- For information, write J. T, Laney, K4VGL 1905 Iris According to the Mobile News the Journal of the Amateur Radio Mobile Society, the following members have attained new stains in the Mobile Century Award I islings W6KZL m 236, F3DJ m 221. G3BID m 20 K SMSRQ m 1 90, DL6UH 160, W4NEW m 140, G3TJY m 121. WA3HDU m IOS. G3KNB m 103, WA4WTK m 102,...

Drak

540 Richard St., Miamisburg, Ohio 45342 Phone (513) 866-2421 Telex 288-017 The entries in this list are correct as nearly as we can manage right down to press time for this issue. Between indifference on the part of repeater managers and clubs toward getting their repeaters listed, a daily change in channels and the appearance of new repeaters on an almost daily basis, no list can ever be perfect. The list presented here is by far the most up to date available anywhere , . and you merely have...

Info

6-VOLT BATTERIES IN S RIES CONNECTION Simple ni-cad battery charger circuit from FM Magazinef as reprinted in The Best of FMP an anthology of articles from FM Magazine pufaiished by 73 and available from 73 Magazine, Peterborough NH for 4.95. ALL CAPAC T0RS-J5V ALL RESISTORS - I 2W Audio ampiifier. This circuit has a high impedance inputf low current drain (0.2 mA), low impedance output, wide range (10 30t000 Hz) and a gain of 200 to 400, Circuit courtesy Motorola HMA-33 Tips on Using FETs....

O

Detector I he peak detector generates an age voitage derived from the audio fed to it from the product detector. This voltage is fed back to the age section through the RC network, A means of providing manual gain control for CW operation is also shown in the block diagram. So here we have an i-f amplifier, a fast attack, slow release audio derived age system and a double-balanced product detector all in one neat package. Although have not tried the I M373 in an FM receiver, some readers may be...

M M M M M M

220.00 235.00 165.00 180 00 99.00 125.00 85.00 S1 25.00 21 5.00 S235.00 11240 W Olympic Blvd.,Los Angeles, Calif. 90064 213 477-6701 MM 931 N. Euclid, Anaheim, Calif. 92801 714 772-9200 Jw Butler, Missouri 64730 816 679-3127 The Tempo fma is the top of the Tempo VHF line. This transceiver offers alt of the famous Tempo quality and performance at 25 watts of power output. The unit also features a low power position for 10 watts output to conserve battery power. Here is a true value in VHF FM...

Hot Gear

On Feb. 3, 1972, YAESU Model FT-101 Transceiver. S N 10703 63 equipped with W filter, was stolen from the automobile of WA2YSW while it was parked in the drivewa gt of his home. Contact rank Y. Widmann, 3 28 Farwood Road. Haddon field, J. 08033, or Officer Lath am1 Police Head qua rters, Borough1' of Haddon field, 242 Kings Highway Fast, Haddon field. N.J. 08033. I 2 meter i M Standard Transmitter SRt 806M, Seriat Number 102703. was stolen from the car of Clem Marliias W6MJ on January 25. 1972....

The Specs

NEW 2 METER FM TRANSCEIVER Model SRCM46 Frequency 143-149 MHz Number of channels 5 Supplied with 146.94 simplex. 146.34 .94 same plug in crystals as SR-C826M R.F. Output 1 watt minimum Sensitivity better than 0.4 Audio output 500 mw Meter monitors battery voltage on Current drain 400 maTx, Size high x 3 wide, x deep Weight 24 oz.t less Options external rnic, or mic-speaker, stubby flexible antenna, desk top charger, leather case. Consider the new- VHF-FM hand held Transceiver by Standard...

Heathkit Hx Marauder

Transniitter. professional wired, no mods, mint condition ' 150.00. W SSYC Henrv I'arise, I Si. Lexinfr ton N W Warren, Ohio 44485, Ph. 216-395-4938. EXHIBITORS - Reserve space now for ARRL Hudson Division Convene tion. Oct. 21-22. Tarry town, N.Y. Contact Hank FrankeL WB2DQP, Box 535, Be 11 mo re. NY., 11711. Phone 21 2 394-5257. long x 3 lIia., x dia. at base sleeve 6 long over end . Painted green. 20 lbs. Unused. Very heavy duty Can be telescoped with short insert. Ideal for Field Da v....

National Devices

LM370 AGC Squelch amp 4.85 LM373 AM FM SSB strip 4.85 LM309K 5V, 1 A regulator. 3-lead TO-3 case. Easy to use. Recommended for all TTL circuits 3.50 PREMIUM QUALITY TEXAS INSTRUMENTS TTL IC'S 7447 Decoder driver for the digital other 7-segment displays 7441 NIXIE driver . . 7490 decade counter 7475 quad latch 7493 divide by 16 74121 monostable . . 7473 dual flip-flop . . readout or . 2.25 . . S.35 . 1.95 . S1.40 . 1.40 . 2.00 . 1.90 . 1.80 . . .85

Amateur Radio Contest

1 he contest has been organized by the Liga Colombiana de Radioaficionados. i Zona 4a and is sponsored by the 7th World Orchid Conference. it begins at 0000 GMT. Saturday, April 8. 1972 and ends at 2400 GM f, Sunday, April L gt . AM and SSB in phone only. 5J4LR and 5K4LR will also be on the air. Multi-operator stations not allowed. Fx change HK4 stations, RS piusa figure number indicating the power of the station. Other stations, KS plus a 3 figure contact number, starting with 001. Points For...

Sn Top View

Turn anything on or off - with light, Use it to trigger an alarm, to turn on lights at dusk, activate, a counter as people pass. . ,or whatever Easy-to-build versatile circuit courtesy of Cafactro Handbook. Transistor is a Calectro K4-505. Ul SIS 7400 QUAD 2-INPUT HA HO GATE This crystal calibrator has a fundamental 1 MHz crystal and its frequency is divided to give outputs of 1 MHz, 100 kHz and 10 kHz All the parts used are easily available from Polypaks, HAL Devices, etc., for a small fee....

Wadgf

Issue 9 71 1 1 71 H 1 12 71 1 72 1 72 1 72 1y72 Point-to-point communicalions on the rally was organized and carried on by the loronto FM Society, They filled in the snowmobile mobile end where a laek of ham manpower was evident, Four KM mobiles, those of Stan VE3AZI , Dan VE3CIQ. Barry VE3FBH. and Kay VE3GSK. were positioned at strategic points along the course, arid tra k was kept of the position of each snowmobile as the da progressed. The base station was supplied In Chuck VE3KQ and ablv...

Am If

Radio Lm373 Circuit

Fig. 5. AM i f strip wiring diagram. second mixer and as a video amplifier with age, manual gain or gating. There are others too, but unfortunately we can't cover them all at this time. If you are mainly interested in using the LM373 in your own designs, Figs. 5, 6 and 7 are schematics for use in the various modes discussed above. Notice that in all circuits, ac coupling is used for signal transfer. Dc paths in integrated circuits of this nature can cause...

Amateur Radio Extra Class License Study Guide

A The Novice Class License Study Guide has not yet been published in 73 or in any other magazine. This book contains all the basic technical information need lo pass the Novice License with flying colors, . .and is invaluable as a basic text for understand ing the General Class Study Guide. Profusely illustrated and so clearly written that just reading it is enough to permit most applicants to pass their exam. S3.95 value. D The Extra Class License Study Guide makes all that complicated...

Meter Power Gain

143-149 MHz 3.4 db gain wavelength Power rating 200 watts FM Get the experience of solid communications, extended range and full quieting with the Hustler BBL models. Optimized gain performance with lowest SWR and the superior mechanical construction will give you the extra advantage. Both models supplied operational, ready for easy installation. Model BBL-144 Mounts on any flat surface in hole easy Installation on roof, without puliing cars' header , deck or fender-complete with adjustable,...

Fuse Clip

Tube and plate assembly showing coup ing capacitor and bypass at lower right Coupling capacitor is held to tube by a copper collar and short strip of brass shim stock. Plate line is a length of chrome plated supply pipe. screwed lo a small strip of shim stock which is clamped under a copper collar encircling the tube The copper collar is held in place with a brass machine screw. 1 he plate tuning capacitor is made from a National neutralizing capacitor with plates in. diameter the movable plate...

Teletype Ribbons Toroids

88 mhy TOROIDS 40 510. ppd. -Fresh RTTY Ribbons 12 3.50ppd, MACHINES - GEARS - SUPPLIES - TAPE Stamp for WAU 11 0 11 T 302X PASSAIC AVE CATALOG VHH fl UL I STIRLING, N. J. 07980 ARC R-19 R 1 - ' RECEIVER 1 1 8- 1 43 MHZ TUNABLE 9 TUBE SUPERHETERODYNE AM RECEIVER, IF 15 MHZ CHECKED OUT WITH BLOWER 1 15VAC 60 CPS 1 PH. 20 CFM 3400 RPM . , . . 4,95 TELETYPE TAPE 3 8 canary 10 rolls 1.25 NEW CA VALOGUE now A VAIL ABLE 104

April Mcmlxxii

Louis area amateur radio operators were called to assist in the search tor a young man missing from his residence at the Sti Louis Slate School and I lospitaL rhe young man was retarded and partially blind. Initial efforts to locate the youth were spearheaded by volunteers from Ehe local Youth Association for Retarded Citizens YARC . After 24 hours of search, YARC leader Tyrone McNary contacted county police seek in walkie-talkie radios. Sargent Joe Owings,...

Twoway Equipment Than Spectronics

Our's of course are for amateur use onlyl Don't miss our monthly specials for Motorola Equipment on the back covers of RPT Magazine THE FM PEOPLE 1009 Garfield St., Oak Park, III. 60304 GIANT SALE ON NEW TTL TEXAS amp NATIONAL ICs SN7472N n SN7473N HI SN7474N Factory Guar, nt d Tetteri Marked Circuit function Quad 2 input gate , gt . . , . . . A 5N7400N, with open collector Hex Inverter, open collector . . . , BCD - to-dec im lt i I decoder driver , BCD-to-decimal decoder BCD to-7 - segment...

Using The Lm

About 2 years ago a new integrated circuit was announced hy National Semiconductor and was labeled the LM373. Inside the little T05 can were the makings of 4 gam stages, an age section, a balanced mixer and a peak defector. Al least thafs what the poop sheet said, and circuits were shown tor using the little jewel in various types of i-l strips. I was fortunate at that time to acquire an LM373 and promptly bread boarded an SSB i-f strip to see how if would perform. It performed amazingly well...

Fo Tune

Schematic of the bfo, i-f and audio portions of K4DHC's receiver. from rny junkbox. A Motorola MCI454 IC power amplifier is used in the audio output stage. It is capable of 1 V of audio into an 8 1 load, ive had excellenl results with this IC and have used it in many projects. The small speaker built into the receiver doesn't do the audio justice, but does make the receiver self-contained. At present a block of 8 pen cells soldered in series powers the receiver. No-signal current drain...

Testing The Comcraft

Can an FM nut live comfortably with a tunable receiver and a vfc transmitter As an old time two meter addict my hands began to shake with anticipation as I plugged in the new Comcraft transceiver, just looking forward to being able to tune the receiver dial and get back to the oid familiar concept of frequency being marks on a slide rule dial instead of numbers on a switch. Sure enough, as 1 tuned from 146.5 to 147.0 there were all the repeaters, blasting through. And even though this segment...

Lm

Figure 9 is a schematic for the remainder of the receiver including the i-f, bfo and audio portions. In order to operate the i-f system in both AM and SSB modes, it was necessary to incorporate a 5-pole 3-position switch, SI, to make the transfer, Two of the poles are used to switch the age time constant components from AM to SSB. Another pole provides bfo input to pin 6 for SSB operation or an offset voltage for AM, Pole number 4 selects audio output from pin 7 for SSB or pin 8 for AM, The...

Digital Special

Ten brand new on carriers dual-in-line JK flip-flops LU321 with data sheet and two pages of application notes describing hookups for divide by three through ten, and twelve. Also self correcting ring counter hookups, etc. 7400, 7401, 7402, 7404, 7405, 7410, 7420, 7430, 7440, 7450,7451,7453 ea. . 30 7441 BCD decoder driver 1.40 7442 BCD decoder 1.40 7473 dual JK flip-flop 65 7474 dual type D FF 50 7475 quad latch 1.40 7476 dual JK FF 65 7480 gated fuD adder I 80 7483 4 bit full adder 1.60 7486...

Comcraft Company

P.O, BOX 266 GO LET A, CALIF, 93017 Write for more information or use READER SERVICE The receiver gets its selectivity and rejection of images by a clever system of i-f management. The first local oscillator is at 65 MHz and is crystal controlled. This doubles to 130 and the output is in the 14 18 MHz range which is tuned by the first i-f. The second local oscillator drops the i-f to 2 MHz and then the signal is channeled into either an FM or AM detector. The 65 MHz oscillator is used by the...

The Case For Tone Access

Tone access is the best way to protect repeater inputs when two or more repeaters share a common input frequency. In many cases the coverage of the repeaters overlap each other and a mobile trying to access one may bring up several others too. This situation is highly undesirable as well as annoying to the monitors of the other repeaters, particularly if they have automatic logging. Tone access can be effective in eliminating these unwanted key ups ami is used in three different modes...

Radio Bookshop

Reprints from the FM Bulletin Feb 6 -Feb 68 including the new regs for 150 MHz marine two-way communications, mobile noise suppression techniques, a direction-finding antenna for 146,94 MHz, four transistor crystal controlled converter for 2m FM, three oscillators for tuning up FM receivers, inexpensive preamp for 2m and 6m, design info on antenna matching, discussion of repeater proposals before the FCC, description and details on Baltimore repeater WA3DZD, first five chapters of the infamous...