Spectra Strip Flat Bonded

We know this is what everyone want* for their home-brew projects, becaui they always ask for it. We now hjve over 5 by mfi feet, but it won't last long, so order now before iTs all gone. We don't want any broken hearts. Specs 20 co ndi.it-tors, 24 AWG, 7 strands, sfze Is ,88 x .044. We could give all its virtues, but rnost people know them or could easily look it up in any industr Lai electi onics hou& e catalogue, Sh. Wt. 1 lb. 10 feet, ,.Order No. SSFBflC tftj price 35 1 ft, SLOO 3 h. 5-00...

U Kirk Electronics Division

East Haddam, CT 06423 Telephone (2031 873-8643 promote this type of development and experimentation. Here are a number of clubs and individuals who have worked together tc set up a working system - a very intricate one - which is fun to use and could be of tremendous value shoula the need develop. The control circuits involved challenged the ingenuity of the designers the terrain covered is credible, with the repeater paths jumping back and forth through mountains, sometimes on two...

J

Popular seven-bar segment with low-power lamps, and the corresponding 7447 decoders. The leading-zero blanking described is implemented by connecting the blanking input (Bl) of each decoder to the blanking output (BO) of the next higher digit, or to the overflow bit at the high end. If the overflow bit is a zero (0 voitsj, it enables the Bl input of the Hundred-Thousands decoder. If the HT digit is also a zero, internal logic in the 7447 decoder will blank all lamps in that display and put out...

Crest

I' -if Oihipr Models Avallah I i * 24 1 'E ANNULS (WITH XT A LS SUPPLIED F Ol t STAUNE LS), MODF . SW- L063& contains Si frlSW H Sr d-Sti* switches ificludino k& vicipsr KOM encoded into EBCDIC, MODEL RW-01135 coma ids 56 7A1MS Rftbd switches including key tops . dic< ie cncoded intc F& CDIC.

A

L-lf L-2 (OAS IJlH) 4 turns No. 16 enamel on National XR-50 Vz in. diameter. Slug removed from both coils. L3 L-4 (0.31 JH) 6 turns No. 14 enamel on National XR-50 form, Slug removed from Lr-3. L-5 1 3 JH) 13 turns No. 18 enamel on National XR-50 form. PC-lt PC-2 3 turns No. 16 enamel wound on 50 ohmt 2W carbon resistor. er's preference. My choice of the 4CX250's was dictated by the fact that i wanted my amplifier compact. Also 1 had the bottles. The finished result has pleased me very...

Vhp Fm Receiver

35 dB power gain, 2.5 3,0 dB N F, at 150 MHz, 2 stage, R.F* protected* dual-gate MOS-FETS. Manual gain control and provision for AGCt 4-3 8 x 1-7 8 x 1-3 8 aluminum case with BNC receptacles and power switch. Available factory tuned to the frequency of your choice from 5 MHz to 350 MHz with approximately 3 bandwidth. Up to 10 B W, available on special order. All the items on this page are avaUabte only from Vanguard Labs. For receivers and converters, state model input and output frequencies...

Info

503, 115V 400CY complete with tens, 39.50 COLLINS RT 349 ARC-55 TRANSCEIVER 225 thru 400 MHz, has synthesizer circuit from 25.7 MHz to 34.7 MHz in 1 MHz steps. Ideal for 220 MHz conversion CV 1758 URR TMC MODEL MSR-9 SS8 CONVERTER. Designed for the detection of single side band signals. The MSR Mode Selector Receiving will also improve reception of CW, MCW, AM, and FSK with any degree of carrier insertion, works with any receiver having 455KC l-F, Size 19W x BVM x 13VzDP weight 26 lbs. Late...

Crt

Fig. 2, Biock diagram of Kadio Specialty Mfg. No J J 63, read accurately. The meter is calibrated for peak swing on the transmitter. Deviation Meter Utilizing a Cathode Ray Tube The Radio Specialty Deviation meter is shown in Fig. 2. The deviation meter is basically a tunable FM receiver and a direct coupled oscilliscope in one package. Peak deviation can be seen visually by calibrating the face of the cathode ray tube. By modulating a transmitter with a sine wave and watching the deviation...

Sanken Hybrid Audio

Have mnde a fortunate purchase of Sanken Audio Amplifier Hybrid Modules. With these you can build your own Sud 6 amplifiers at less than the price of discrete components. Just add a power supply, and a chassis to act as a heat sink. Brand new units, in original boxes, guaranteed by Band F, Sanken,and the Sanken U.S. distributoj Available in three sizes 10 watts RM 2U watts music power I, 25 watts RMS 150 watts M.P.J, and 50 watts RM P 100 watts M.P, per channel Twenty page manu facturer's...

Oht

Pure white high contrast electro-sensitive paper. x 19-1 2 for TXC1 4 per package of 250 sheets or 15 per case of 5 packages, All cut up and ream wrapped for Deskfax - 5 per 100 sheets. Postpaid in Continental U.S. All other items sent postage collect. Foreign please include sufficient postage U.S. Currency. 25c handling fee on all COD orders.

Flea Powered Keyer

Occasionally 73 receives letters from aspiring amateurs wanting to know if we can locate someone to help them get their license. Perhaps there are many more of our non-ham readers who also desire help. Starting with this issue, we witl publish names, addresses and telephone numbers of those desiring assistance r If you need help, don't be bashful about sending us your name you do want your license don't you Each month, amateurs and clubs should look the list over and give a hand to those in...

M Fm Transceiver Srca

213 775-6284 639 North Marine Avenue, Wilmington, California 90744 220 MHz Clegg FM-21 Transceiver puts you in tomorrow's channels 220 MHz FM is the early solution to overcrowded 2 meter channels. Here's your chance to get in on the ground floor of the FM future. The new FM-21 all solid-state transceiver is an opportunity to ''do it right this time and start with the leader. The FM-21 uses oniy 1 crystal in any channel . , , one crystal gives you a separate transmit and receive frequency as...

New Counter

Regency has announced an excellent new counter, the EC-175, This unit has six LED readouts, making it possible to read a 146 MHz frequency out to the kHz, which is extremely handy when you are tweaking a crystal on channel. Regency has overcome one of the basic problems inherent in most inexpensive counters the warm-up time by letting the crystal oven run all of the time and having the front panel on-off control turn the rest of the unit on. And off. Thus the counter is all warmed up ready to...

Hewlettpackard Spectrum Analyzer

The famous Model 8551B with Display HTP, 851B. Excel, cond. CERTIFIED with new TWT. Now reduced to less than half of original price Special. Only S5500.00 R-748 TRC-47 single channel AM crystal controlled 110V 60CPS, pwr supply amp speaker built in, squelch, r-f gain, dual conversion modern design. Size 19'W x 5H x 14D for rack mtg. Supplied with schematic amp hookup info. No conversion required. Exl condition 29.95 70 -100 Mc. Single channel. 50 W. output. 110 V, 60 cycle. New and like new....

Model Teletype Page Printer

Rebuilt iike new by US Navy, In orig, govt, packing With table, power supply and manual, BARGAINS 15 KSR WITH KEY BOARD ____S200.00 Original government cost over 10,000.001 One of Navy's most modern radio receiving sets. Built by National Radio Co. in last decade. A triple conversion super-heterodyne. Frequency range 2 to 32 MC. continuously, or in 1 kc increments. 4 bands. Featuring full carrier suppression, unit receives AM, CW, MCW, voice, facsimile, QUIRES NO MODIFICATION Greatly superior...

MHz BAND

Biff Turner WA0ABI Five Chestnut Court St. Peters MO 63376 K0TVD reports the band open from Nebraska nearly every day during December, with the 9th and 17th being exceptional good to the east coast. Santa brought Chuck a new 11 element Telrex. He hopes to have its 36 foot boom at the 70 foot level by early spring. WA1EXN, Maine, reports E and or scatter contacts during 13 of the last 22 days of December,Among those heard and or worked were WB4LHD, WA5YJR, WA5MZW, K9H MB, WA4MHS and WA5SJM. Art...

Hpa

TV-2 U TUBE TESTER, mutual conductance, checks old and late type Viet Nam vintage, the best, cost govt, 960.00 TS-505D U VTVM 0-250 VAC, 0-1000VDC, 0-1000M ohm resistance measurements, AC frequency response 30 Hz to 500 MHz high input impedance, portable ruggedized construction complete with robe, late military vintage . . 45.00 JERROLD 900A WIDE BAND SWEEP GENERATOR 500 kHz thru 1000 MHz, with Model D 50 detector full wave, peak to peak type. Ideal for lab, production, tests, etc 375.00 SG-71...

Electronics Corp

9AM 4 PM Monday thru Friday otherwise by appointment OFFICE Longview St. Tel. Area Code 203 875-5198 FINE QUALITY USED TEST EQUIPMENT Checked and Guaranteed in Goad Working Con drtion. -H-P 624-B X-band Test Set, 8-5-10 -H-P 686-A Sweep Generator, 8,2-12.4 GHz 200.00 MHz , 200,00 -Tektronix 541 Scope, 5, DC-30 MHz. Uses letter plug-ins. Less plug-in, 250.00 Plug-ins for Tektronix Scopes B, DC-20 MHz. 50.00. C Dual-trace, DC-24 MHz. Hickok 100.00. D, High-gain DC Differential DC-2 MHz. 1 mv. cm...

Ed Juge Electronics

3850 SOUTH FREEWAY PHONE 817 926-5221 tastic - and peopre have been learning languages at a speed never thought possible before. This has been particularly true in the case of getting large vocabularies into the memory the toughest part of learning languages. Just think how great this would be for electronic theory I But, down to the nitty gritty. You will need some soft lounging chairs where the people can sit back and relax completely, feet up and totally at ease. You ll need a good hi-fi...

W

As new as tomorrow The Tempo Commercial Line VHF transceivers offer commercial performance at amateur prices. Both units include an audio limiter to assure constant deviation at all times and an instantaneous impulse squelch. Microphone, power cord, mounting bracket and one pair of crystals is included. Frequency Range 220-225 MHz 2 MHz operating range Number of Channels 12 channel capability for transmit and receive Frequency Stability -0,001 -20 to 60 Audio Output 2 Watts minimum w internal...

Available For All Popular Iweter Transceivers

Shunted with 200 juF of electrolytic capacitors to guarantee the high current capacity required during printing. Hard control of the voltage is necessary since the current varies from zero to 200 or even 300 mA. Be - pi'-' , . - - j i . Tr- _ w 1 i L . I . v-V ' jfi - it absolutely sure there is no ac hum in the power supply. When operating the fast fax, unless you have a variable standard you should note if the transmitting station is sending live copy. If he is not, or cannot do so, there is...

Unijunction

Tlhis is the second part of a two part article describing circuits and their functions in SSTV. Part I covered the use of operational amplifiers, timing and gating circuits, phase lock loops and sweep generation. This section will continue the discussion with descriptions of slow scan sweep drivers, subcarrier generators, limit ers, dis-eliminators and active filters. A regulated power supply that is suitable for the above circuitry is also presented. It was recognized very early in velopment...

All Transistors Are N

SfGNAL LEVELS ARE MEASURED AT IQOKHi Fig. 11. Schematic of the front end of the counter containing the pre amp and pre-scaler. with emitter-follower buffers used for impedance-matching. Q6 and Q8 are the common-emitter gain stages. The 2N3563 transistors used have an Ft of 900 MHz, making them very good high frequency transistors, but even so at frequencies above 10 MHz their output impedance is so much higher than their input impedance that the emitter follower Q7 is required to match between...

Waabi

Bit I Pasternak WA2HVK 6 14732 Biythe Street 17 Panorama City CA It was in 1962 that I last tried my hand at writing, I must admit that f am more than a slight bit rusty at it. Why then am f crazy enough to undertake what I hope will become a monthly column about FM activity in the Southland Perhaps the answer would be simpler to explain if you permit me to digress for a moment. 1 believe it was in April of 1970 that the incident took place, t was here in Los Angefes on business and had a...

Camp Albert Butler Radio Session

Courses Taught General Theory and Code Advanced Theory and Code Amateur Extra Theory and Code Golf privileges at New River Country Club also fishing TRULY A VAC A TtON WITH A PURPOSE PeopJe attended from f ie following slates and areas North Carolina, South Carolina, Missouri, Tennessee, Utah, Florida, Oklahoma, West Virginia, Alabama, New Hampshire. Iowa, District of Columbia, Vermont, Arizona. Indiana, Ohio, New Jersey, New York Massachusetts, Maryland, Virginia Illinois, Michigan, Georgia,,...

Complete Stocks All National Brands We Buyselltrade Used Equipment

Loul , Mo. 63132 Phone 314 993-6060 The skew in this fax picture was caused by a tape recorder at the transmitting end. also with emery cloth. This will prevent a smudgy appearance when collected pigment accretions begin behaving as crayons. As normai printing occurs, the biade deteriorates due to the necessary electrolysis which bleeds off positive iron ions into the paper. The iron ions unite with the chemical in the paper to produce the mark. After a time the blade may...

Fm Your Gonset

en your Cteijci 22 err Puly Cumin 2, PC 62h J'ohrtsuii 6M2, Acutum 500, HA 460, T X 62 ot VHF 1 Newt Plug-in modulator puts the C om municator transmitter on FM, No modification or rewiring on your Communicator, Just plug into mike jack and crystal socket. Compact self-contained modulator measures Works with Communicator t II, ill, IV FM at a tenth the cost of a new rig, Frequency adjust for netting built in, 34,50 postpaid U.S.A. 36,50 for PC2. PC 62. HA-460. Specify transmitter model,...

Communications Equipment

MOTOROLA OA442 TWO METER 1 4 KW Amplifier, new in factory ctns W manual . . . 350.00 NEMS-CLARKE 1670G VHF receiver N EMS-CLARKE 1432 VHF DEFENSE ELECTRONICS IFT-1 PHASE LOCK TRACKING UNIT, 10mc if mput 00 MOTOROLA UHF Receiver strips, MOTOROLA NPN 6012A ac power supplies, FARINON SS2000C Solid state microwave systems. Brand new P.U.R. SECODE RPD 634 Digital MOTOROLA TU588 T power supplies, 12v, new. add 10.00 for PL 25 00 MOTOROLA UHF Transmitter strips, TMC SSB Converter, CV1758 URR 455kc IF...

Wca

Ulmn PtlOA 7'xegpiunl LEI uadrml willi di arar 1er Heipht improved hr htnrss. Ml hatid decimal oinl nd au expected of f v r 10Q yeatfc, Thesu arc rantf nrw wilh iull du ta Jim und l-pagi multiplying Lipp ira lion nota. Ntiw atailabU- i gt ihr iar PT OPi.'OjAk Sl.A-l with Ii haraeter beight and am UL-1UA. olh Iii in DIP H cii and un' available jn nvt-rflp ditit al the sswinh price E,i rruiix 0L- DI or Opcdi SLA-2 . Mixing of rcguinii arid ovprrfwW digil jlltiwrri, M gt TE Needs a 7447 driver...

Digital Clock Kit With Nixie Display

Hecaum w have made n extremely good purchase of over 20,000 nixkrit wo can tell a complete digital ctock kit for Im than thn usual coit ot the display tub alone Wd provide a complete etched and thru-plated circuit board, all Integrated circuits, complete power supply, diiplay tubes, LC, sockets nd a nice front panel wilh polaroid visor. We hove never seen anyone offer thl kit for less than 100,00 before. Include BCD outputs tor usa a with timer option. May be wired fot 12 or 24 hour display....

Dx Representatives

Ltd, 1 78 Collins ftreet Melbourne 3 00, Victoria Austral ia Gordon and Gotch Ltd, P.O. Box 584 Auckland, New Zealand The Wireless Institute of Australia 478 Victoria Parade P.O. Box 36 Carlos Rohden Caixa Postal 5004 Sao Paulo, S,P gt Brasil New Zealand Assn. of Radio Transmitters P.O. Box 1459 104 Hereford Street Christchurch, New Zealand Jim Coote 56, Dinsdale Avenue Kings Estate Walisend Short Wave Magazine 55 Victoria Street London, SW1, England Harold C. Leon P.O. Box...

Drafting

K- Wildman W6MOG BilJ MoreMo Wayne Peeler K4MVW T, M Graham WSFKW 2 Never Say Die W2NSD 1 6 SSTV Scene 6 Mars 9 Repeater Update 1 1 DX Footnotes 12 AMSAT News 1 2 Hamburgiar 12 50 MHz Band 1 5 Looking West 16 Report from Managua 107 The Travelling Ham 107 FCC News II 0 Social Events amp Contests III Ham Help 111 New Products 126 Caveat Emptor 160 Propagation 20, A Fast Scan Facsimile System .....................W6WMI 31. Six and Two Meter High Power .....................K4EP1 35- Solid State...

One

At the recent FM Symposium in Medford Mass. a chap speaking for the semi-defunct Northeast Repeater Association tried to stop all discussion of a one megahertz split for repeaters. My feeling was that if the idea has no merit, then a discussion of it will kill it. If the idea does have sufficient merit, then talking about it will spread the idea - but that censorship and trying to shut people up and prevent them from talking about it is the worst v to go. The Association tried the same stunt at...