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Sync detectors and fading
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January 19th 07, 06:57 AM posted to rec.radio.shortwave
HFguy
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First recorded activity by RadioBanter: Sep 2006
Posts: 80
Sync detectors and fading
wrote:
If the selective fading is as tight as you indicate, then there would
be "holes" in the audio spectrum of the recovered AM, much like a comb
filter. Sync demod won't fix that problem.
There are too many people that think sync demod will cure everything.
It's just not true. Now if you have a nearby signal bleeding into the
desired signal, then pick the sideband the furthest away from the
interfering signal. Here, sync works great. If you have fading, you can
narrow band the signal by using one sideband. It helps a bit, but the
signal will still fade.
All this assumes your sync is decent, and not a growler. Otherwise, all
bets are off.
If sync' detectors are only good for selecting the best sideband, how do
you explain the fact that the audio distortion caused by selective
fading can almost completely be eliminated with a good sync' detector?
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