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In article ,
says... (Fred McKenzie) wrote in message Keeping the oscillator running and keying subsequent stages will usually produce a more stable signal. However, it is not unusual for some of the oscillator's signal to leak through and be radiated by the antenna. You can probably imagine a CW tone that gets louder when keyed, but the pitch doesn't change. When such a station is nearby, it is hard to discriminate between the strength of the keyed and unkeyed signal. If you use this approach, you should pay attention to keeping the oscillator from bleeding through. One method might be to key all of the following stages, for example. I had a rig in which I kept the oscillator running on key up. "VXO 6 watter" from "QRP Classics". Great rig. The "backwave" never caused difficulty in copying. I got about 5 W out (keydown) and about 15 milliwatts out (keyup!) This provided some fun: If a station gave me a good report, I'd ask if they could hear the REALLY QRP oscillator on key up. Many could! 73 Bill CU2JL http://planeta.clix.pt/n2cqr was there any shielding around the VXO or a terminator to keep the leakage down? mike c |
#3
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In article ,
says... (Fred McKenzie) wrote in message Keeping the oscillator running and keying subsequent stages will usually produce a more stable signal. However, it is not unusual for some of the oscillator's signal to leak through and be radiated by the antenna. You can probably imagine a CW tone that gets louder when keyed, but the pitch doesn't change. When such a station is nearby, it is hard to discriminate between the strength of the keyed and unkeyed signal. If you use this approach, you should pay attention to keeping the oscillator from bleeding through. One method might be to key all of the following stages, for example. I had a rig in which I kept the oscillator running on key up. "VXO 6 watter" from "QRP Classics". Great rig. The "backwave" never caused difficulty in copying. I got about 5 W out (keydown) and about 15 milliwatts out (keyup!) This provided some fun: If a station gave me a good report, I'd ask if they could hear the REALLY QRP oscillator on key up. Many could! 73 Bill CU2JL http://planeta.clix.pt/n2cqr was there any shielding around the VXO or a terminator to keep the leakage down? mike c |
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