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I used to enjoy this... using small transmitter designs from old ARRL handbooks, or Motorola books using the AN's from them (application notes). You can make simple AM or CW transmitters or receivers for next to nothing.
For nostalgia, HF designs using tubes are not picky when it comes to...
If only HALF of these stories are true, then maybe understand the other side of the fence. Like when a customer, good intentioned, would come into the shop and ask a question. We would give them the proper technical answer, only to have them argue with us telling us joe billy bob's cb shop in...
I LOVE the 223's. I have rebuild tons of them and owned over 20 or so. The grid leak mod is good advice, although I didn't use the same value, but the end result is the same. I also would so some mods in the final output section and modulator section as well.
If you need a 32.9 rock, lemme...
I have seen this and solved it many times. While every situation is different, usually the problem has to do with common mode currents along the feedline more than anything else. You can ground everything till you are blue in the face, and also add ground radials which on this type of antenna...
Hey guys, a few things. ALWAYS remember.. a bias source needs to be a low impedance, high current, stable source.
The best, cheapest way to do this is with an AUX relay to turn the bias on and off during TX only. Do not forget to use RF bypassing in your circuit, lots of .01 caps and made...
Just a few things if I may...... A "CB" style "class C" amplifier *COULD* sound ok on AM and SSB although this is not proper, and I would never recommend it. The reasoning behind this is because these amplifiers, while by definition ARE IN FACT class c, they are not biased deep into the class c...
wow---didn't know there was a market for this. The radio can be expanded and not by changing a chip. Did many of them back in the day before the shop closed.
I seriously doubt the problem is the "radio's harmonics" first of all a harmonic by definition is a multiplier of the fundamental frequency. These tubes wouldn't have much gain as you start going up that high. Secondly the input circuit isn't designed for it, and third and MOST important is that...
I have a question, I have kept my mouth shut for a couple years mainly to avoid the controversy involved and let people think / do whatever they want to with their radios (because ultimately they will anyway) but when did this 2SC2999 modification for receivers that has been floating around the...
Probably because someone somewhere said that this was a good thing to do. Even then you are limited to the receiver bandwidth through various chains and filters.
I don't know about the other user's reply, it seems a little bit on the exaggerated side, however it CAN damage the PIN diodes in the front end that conduct when there is too much signal and shunt the RF to GND which they are supposed to do. However if one of them becomes shorted or partially it...
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