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September 14th 06, 06:58 PM
posted to rec.radio.shortwave
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possible fix of rumble synch satellit 700
In article ,
Telamon wrote: In article . com, wrote: Here is the article I found form newsgroup that mention about the way to eliminate the rumbling noise of synch detector . I hope someone can study it and give a conclusion on the improvement made be these modification. Snip Some radio stations are off frequency. Use a mode that injects a fixed receiver local oscillator frequency like CW mode to zero beat the receiver to the target signal then switch back to sync AM. And, from a dimly remembered article in QEX many years back, a lot of shortwave broadcast transmitters have a lot of phase noise. (Speculation: probably those high effiency transistorized class D ones). Put a noisy carrier into the servo loop, and the output of the phase detector will need just the right filters to not carry that through to the VCO. Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
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