Power Amplifier Brochure

A 20-page brochure that describes basic concepts and techniques employed in the design of transistor audio power amplifiers and 38 silicon power transistors specially selected for use as input, driver, output and overload-protection devices in such ampli fiers are available from RCA Solid State Division, RCA Publication No. APA-550, Audio Power Amplifiers, describes significant design features, basic cir cuit configurations, rating methods and stability requirements for transistor audio power...

Amsat

Michael Fr ye WB8LBP 640 Desuelle Or Dayton OH 45429 Michael Fr ye WB8LBP 640 Desuelle Or Dayton OH 45429 Activity at AMSAT headquarters is gaining momentum. With OSCAR 6 nearing it's expected lifetime, AMSAT is moving full speed ahead on OSCAR 7. Already funds have been set up andl work has begun with an eye toward an early 1974 launch. Tracking OSCAR 6 can sometimes be a difficult task. Someone has finally come up with an idea to permit amateurs to track OSCAR reliably time after time,...

Fcc Extends Time Limit For Repeaters

Adopted August 29, 1973 -Released August 30, 1973. By Acting Chief, Safety and Special Radio Services Bureau. 1. The Commission has under con sideration, on its own motion, the extension of the license term of all amateur stations licensed prior to October 17, 1972, and operating to automatically retransmit the radio sig nals of other amateur radio stations or as remotely controlled stations prior to that date. The purpose of our action herein is to preclude any un necessary interruption of any...

Voltage

A monitor transmitter for channeJ 3, See text for details on adjusting the modulation control, Modulate this circuit with Fig. 6. and on, and since there is no eapaeitive load in the composite sync signal path, the sync signal is not delayed, and the picture is not shifted. 1 iis transmitter uses the same basic oscillator as the channel 10 sync transmitter-Operating with a 70 mW carrier the germanium diode is biased into conduction with current from the standard video line. As current...

Sstv Output

L SSTV Graphic CRT' block diagram. assembly. The unit's memory costs approximately 60, and a complete unit would probably be around 100. incidentally, Robert also now has available schematics, scope patterns and descriptions of both the W0LMD SSTV keyboard and theW0LMD scan converter (approximately 13 pages worth ). Cost to reproduce and mail each set is 1.25. Another company, Venus Scientific Inc., of Farmtngdale, New York, recently entered the Slow Scan field and should have their...

Strikes Again I

AF68 No, 10888 K5LKL PMfiS No 10918 Ml070 pwr supply Standard B2GM,l lo, 1T20Q7 WA8PCG FM27B No 27013 1141 FM 144 10L No. F459 PC 107m pwr supply 2 5AJ-IPL Onan Gen No. 327885 R4B No. H578G T4X8 No 17801 G W4 wattmeter No 8390 Swan 2S0 No F1S4806 Swan Afr wi sup. No HR-2NO 04C2S79 SB No 211828 STD 326 No 011268 HT220 No. GJ7327 Yaesu FT 107 No. 82G 12279 CW HR 2 No 0302030 Clegg 278 No. 72013 1068 Std. 826MA No. 20807B Drake ML 2 No. 10582 Tektromcf 453 Scope

Ktwj

Bill Turner WA0ABI Five Chestnut Court St Peters MO 63376 The September contest came and went without much of 3 stir. . ,the high point in the eastern half of the country was an excellent quality Aurora for a few hours Sunday afternoon. W8CCI, VE2DFO, W82LZD 3 and several others were very active on scatter, Cross your fingers, perhaps December will be better. How many suffered coronary problems when Rayburn KH6HPV, caiied CQ and recovered when they heard the portable 5 tacked on the end Vern...

Dun

NOW GO PORTABLE WITH YOUR MOBILE UNIT A self-contained rechargeable battery pack for amateur mobile systems which allows full portable operation. Automatic charging from automobile or fixed power sources during receive operation. Will operate an HR-2A for 4-5 hours of normal operation at full output power 7Y2 X 5X 1 Vz, 12 VDC, 2.5 Amp Hour, 10 Amp Max current protection. Sealed lead-sulfide cells. High impact polymer case. 'Oklahoma residents . rt , ., add 3 tax Midwest City, OK 73130 *...

Info

SBE opens up a new high speed route that leads to instant 450MHz operation from any 2 meter transceiver Rev up switch in the exclusive SBE, SB-450TRC CIover)ear arrive instantly on 450 Return at will Installation couldn't be more simple. Outwardly, Cloverleaf is a small black box that connects between your existing 144 MHz FM transceiver and its antenna, also to the microphone and car 12 volt battery. You plug the 450MHz antenna into another receptabie provided. SB-450TRC has no...

Meter Preamp

Data Engineering has come out with a nice 2 meter preamp using Mosfets. We installed one of the preamps on the 146J 9 receiver at 73s WRtAAB Repeater and were very, very delighted with the results. Tests showed about 20 dB gain and s noise figure of less than 2.5 dB. To put it another wayP before the preamp was installed our receiver was exhibiting .4 for 20 dB quieting. With the preamp in the line the receiver is now good for .1 v 20 dB quieting . That does make a receiver super sensitive....

Fcc

Biff Pasternak WA2HVK 6 14732 Biythe Street 17 Panorama City CA It is easy to blame Mr. Walker for all that has taken place, but in retrospect isn't a good part of it our own personal fault Most of us just sat back and waited to see what would happen, instead of doing something about it. We looked to people like Wayne to carry the ball for us. We laughed at the idea of a professional Amateur Radio lobbiest fighting for the kind of legisiation that would advance our hobby rather than retard its...

Thomas Advertising Co

715 Silver Spur Road, Suite 210 Rolling Hills Estates. California 90274 ALSO - MANUALS FOR STANDARD COMMUNICATIONS Sn-CB0 AND SAXB2G contacts to the customer provided equipment lo indicate the status of the connecting arrangement, During line seizure, leads TRI TR2 are shorted and leads R2-TR3 are open. When disconnected from the line, leads I R1-TR2 are open and leads TR2-TR3 are shorted. Leads BI and provide for a connection to a customer provided dc power source for operating the...

Wlt

The relationship of the hand units with the silver dollar at the right is one of size comparison only. Owning the very latest in Handi Talkies had always been the apex of many FMer's ambitions, I myself have looked on. green with envy, as one of my buddies showed me his new six channel five watt HT220 but the price stopped me dead- Well, if you aren't rich, but are the type who likes to be the first on your block with a new goodie, try this on for size An H I with one watt output minimum ,...

Ketn

0 12 Channel Capability j 0 0.35 iv at 20db Receiver Sensitivity 0 100db at 25 KC Selectivity 0 Reversible Control Panel MJ CO for further information call or write ann COMMUNICATIONS amp ELECTRONICS, INC. 28710 Canwood St. 2837 North 24th St. Hj l Agoura, CA 91301 Hj Phoenix, AZ 85008 BankAmer CARD 213 889 6666 f fl kr 602 955-4570