Selectronics
OS-11 Scope Full 1 Meg 3 Tube For 19 Rack Mount Regular amp triggered Sweep. Price 34.95 TS-323 UR Freq Meter Controlled heterodyne-type Inst. Freq Range 20-450 MC. Price 74.95 Xcellent Cond W Bogk TS-155C Sig Generator Freq Range 2700-3400 MC Units in good condition. Sold for Parts 14.95 115V - 50-1600 eye 1 phase P S included in Gen. R509-ARC Receivers Freq Range 118-143 MC with squelch. New 14.95 T-19 ARC Xmitters 3 4 MC Freq Range. 1 MC-Xtals precision type for octal sockets. Panel Meter 0...
Health
Fig. 1 Tubing may have balls or disks on their ends or strips may overlap for slight fixed condenser effect. Connect the high voltage either to A and B or to A and C. Practically there is no difference. If there is one thing we readers of 73 have even more in common than our interest in radio I would guess it would be our health in general, though we usually do little about it, and in particular the desire not to die after great pain from cancer. There is something we are qualified to do about...
V Iak
Then there's our NEW 4-channel 100 150W remote-controllable 2-meter transmitter COMPLETE, WITH MIKE, CABLING, CRYSTALS, 12V OPERATION 948A Avenue E Riviera Beach FL 33404 305 844-1323
The Hartley
A tribute to R. V. L. Hartley who, until his recent death, was one of the last of the real electronic pioneers. Ralph V. L. Hartley, inventor of the Hartley oscillator, died on Friday, May 1, 1970, at Overlook Hospital in Summit, New Jersey. He was 81 years old. Ralph Hartley graduated from the University of Utah in 909 and studied for the next three years at Oxford University as a Rhodes scholar. After returning from England, he joined the research laboratory of the Western Electric Company....
Reactance Ohms 1
touched the tip of the pencil to the whip where it resonated at 3.8 MHz and arced a ring around the whip. This mark is permanent and very easy to see. I then turned the rotary inductor all the way in and retuned the transceiver for maximum output. I found out that maximum output occurred at 3.85 MHz, 50 kHz up the band. I then ran the rotary inductor back to its original spot and retuned the antenna to 3.85 MHz by lowering the top section whip. When I again found resonance, I marked this spot...
Specialists Co
Evaluation of Swan's 2 amp 6 meter Antennas When I decided to operate on the VHF bands, my first consideration was the antenna system I made plans for this important feature even before making plans for the rig that I use. One day I heard about a firm in Stockton, California, that made antennas to order that led me to Oliver Swan's place of business to discuss 6 and 2 meter antennas. Having worked in the broadcasting business for some years and having met countless lids who try to convince you...
Hygain Electronics Corporation
P.O. Box 5407-GC, Lincoln, Nebraska 68505 The most powerful antennas under the sun ____. . _ NOW A GREAT NEW WIDE BAND VERTICAL for 80 through 10 Meters Take the wide band, omni-directional performance of Hy-Gain's famous 14AVQ WB, add 80 meter capability plus extra-heavy duty construction and you have the unrivalled new 18AVT WB. In other words, you have quite an antenna. Automatic switching, five band capability is accomplished through the use of three beefed-up Hy-Q traps featuring large...
Mobile
The 75m mobile antenna I use raises a few eyebrows now and then, but it really works, and does so exceptionally well. It is the best performing 75m mobile antenna I have ever had the pleasure of owning. It is of the homebrew variety, using all commercially available components. There is nothing really new in its concept except that I have adapted the features of many different antennas to come up with one that maintains high Q and high performance over the entire phone band. It does look a...
Write For Free Catalog
Money refunded without question if equipment is returned within seven days from shipment, undamaged, freight prepaid. Unless otherwise specified, equipment is used, and is sold as-is. AM items shipped FOB Tarzana. California. Crystals, ovens, antennas not included unless specifically stated in catalog. All equipment is sold on a first'Come, first-served basis. RO. Box 138, 18669 Ventura Blvd., Tarzana, Calif. 91356 savings and you don't have to lug a charger around with you. SONAR 2301 Sonar...
Military Electronics
24 PAGES, crammed with Gov't Surplus Electronic Gear -the Giggest Bargain Buys in America tt will pay you to jSENO gsglfoi your copy Refunded with your first order. BC-223AX TRANSMITTER 25-watt, CW, MCW, Voice, Crystal control oil 4 pre-selected channels, range 2000 to 5200 Kc by use of 3 plug in units. Complete. BRAND NEW S27.50 APN-1 FM TRANSCEIVER 100-450 Mc, Freq. modulated by moving coil transducer- Easily converted for radio control or 70 cms. Complete with 14 tubes, dyn. BRAND NEW ....
Walkie Talkie
If you are seriously thinking about adding a walkie talkie hand-held transceiver to your 2 meter FM system, but confused by the many types of units and wide range of prices, I think this article will help you make your final decision. The advent of repeaters and the convenience of carrying around a small transmitter with a range of 50 100 miles makes the purchase of a walkie-talkie tempting indeed. Our company spent several months collecting information on all the VHF high band commercial...
USA Fnk
The workhorse of the walkie-talkies. There are probabiy more of these units in use than any other. Good specifications, many accessory options, and two-frequency kits and a four-frequency kit for amateur use still make this transceiver desirable. As newer units are put into service, more used HT-200s become available. Motorola sells reconditioned units to commercial customers Spectronics, Inc., near Chicago, sells used Motorola units to amateurs. We hope our research and this short summary will...
Vhf Fm Monitor Receiver
Weather satellites at 137 MHz. NEW IMPROVED CIRCUIT. Two dual-gate MOSFET RF stages eliminate the need for a pre-amp. Extra high quality 8 pole, quartz, 10.7 MHz integrated filter available in your choice of 15 or 30 KHz bandwidth. 4 push-button channels with trimmers for each crystal give precise frequency setting. Dual conversion with 10.7 MHz and 455 KHz I .F.s. .3 to .5 jjCW sensitivity for 20 db quieting. Integrated circuit 1st I.F., 2nd mixer and oscilillatDr, 2nd I.F., squelch, AGC,...
Transmitter
The DSB transmitter described herein uses crystal control and runs 1 watt or so, which can be used barefoot or to drive an rf amplifier. The unit should be assembled in a small minibox or built on perf-board or PC board and then installed in a small minibox, as stray hand capacitances can upset the carrier balance. The transmitter consists of speech amp, carrier oscillator, balanced modulator, and PA stages. The amount of carrier suppression available with a diode-type balanced modulator is -40...
Base Hookups
Fig. 2. Suggested semiconductor hookups for tube sockets. gate. You may find it necessary to tune the source, drain, and gate resistances in order to have your vfo working well with a particular FET. I used potentiometers across the various elements to arrive at the recommended values. My vfo works reliably from 10V down to 6V and the maximum drain current is 1.5 mA. Other oscillator hook-ups may occur to you, and they will work but the tuning range and linearity of the vfo will suffer Linear...
Lex
CO., INC. 833 Broadwav. New York. NY 10003 Be a PIONEER in HAM TV build your own camera BRAND NEW KIT MAKES ASSEMBLY EASIER AND MORE FUN THAN EVER J THE ilivir MOW OLID'iTm CAMERA KIT AVAILABLE. VIDIC0N m line rii.lution AUTOMATIC 1 11 r r,r-i ,,1,.-llii, ViJfcO Of RF DLltpLli ch. 2-fi rr.11-, wiihoMi n-i ljfif i - la any TV sot Special ltKtay discomit ptice. Rrgvlv 129.95. Vidian jr ctd sepvately IV, fj PrICEs penpaid. Special ltKtay discomit ptice. Rrgvlv 129.95. Vidian jr ctd sepvately IV,...
Radiation Devices Co
I 5200 Panama Ave., Richmond CA USA 94804 THE ONLY OSL BUREAU to handle all of your GSLs to anywhere next door, the next state, the next county, the whole world. Just bundle them up please arrange alphabetically and send them to us with payment of 4 lt L each. The compressor unit performs very well. I hooked it up to a tape recorder to check performance and quality of the audio. I could speak loud or gently, close or several feet away from the mike and still got the same volume out, audible or...
Electronics 1
6150 DELMAR BLVD., ST. LOUIS, MO 63112 314 726-6116 NL-940 DIGITAL NIXIE TUBES Numerals 09 7400 SERIES GATES - any type-please specify dual inline package 50 7490 COUNTER, 7475 QUAD LATCH, 7441A NIXIE DRIVER - all three for only ____7,50 930 SERIES DTL GATES - any type-please specify dual inline package 60 7400 SERIES DUAL FLIP FLOPS any type-please specify dual inline package . . 1.25 709 OP AMP in TO-5 CASE. Ideal for pre- amps, RTTY, TU, AFSK OSC. etc 1.25 MOTOROLA MECL - MC301, MC303,...
Antenna 1
Fig. 2. Radio frequency amplifier, schematic. Fig. 2. Radio frequency amplifier, schematic. until I started looking through the manual. If the drive level on the grid of the final amplifiers drops below 10 mA, the keying relays won't pull in. The relays, once keyed, will stay energized, though, even if the drive falls to around 5 mA. But if you drop power on the input, you won't get the rf amplifier going again until you can generate 10 mA of drive. It seems to require about 8W of transceiver...
Communications Corp
World s largest manufacturer of marine V.H.F. equipment Squelch sensitivity Threshold .2 microvolts or less 2 MOSFET RF Amplifiers 1 MOSFET Mixer Deviation acceptance Up to 15 kHz deviation Spurious and image attenuation 65 dB below the desired signal threshold sensitivity Adjacent channel selectivity 30 kHz, channels 60 dB attenuation of adjacent channel Type of receiver Dual conversion superheterodyne Audio output 5 watts For external speaker 339.95 complete as shown with microphone, built-in...
MOTOROLA MEIEO POWER AMPLIFIER WIt WAnS OUTPUT BRAMI NEW
This is a completely self-contained power amplifier designed specifically to increase the power output of low power transmitters. It requires no modifications to operate on rtty, fm, mew, etc. in the above listed freq. range. It will deliver 250 to 300 watts out when driven by a 2 or 5 watt handie talkiel The power output can be increased up to 700 watts with a very simple modification. Change tubes to 4CX250B s, make minor change in power supply, instructions supplied with each unit. Very...
Watts 1
Fig. 5. Rf power amplifier stages. With a 50 mW input, a signal of at least 5W is produced. As shown in the block diagram of Fig. 1, the design of this transmitter is straightforward and it is easy to build and tune. Deviations from values upwards of 10 will not affect the operation however, I do recommend that no changes be made in the type of transistors or diodes. The oscillator Fig. 2 uses a 2N3866 and a 2N3904 in an emitter-feedback configuration. The inductor in series with the crystal is...
Transistorized Lm Freq Meter
A few simple modifications and you can plug FETS right into the tube sockets. The last word may never be written about the BC-22I and LM frequency meters. The LM is particularly attractive because it is in the smaller package. With transistors replacing tubes, it has features most everyone wants it is rugged, portable, and accurate, to name a few. I will describe a conversion of an LM-15 frequency meter in which field-effect transistors replace tubes the power supply becomes a standard 9V...