Mike,
I see this sort of overmodulation all the time. In fact I can hear it most of
the time (it sounds nasty) even when there are 20 or so signals. Note that the
harmonics are at n-times the frequency of the fundamental, and they're n-times
wider. This is the result of the modulating audio signal being hideously
distorted somewhere along the chain. I sometimes see only odd harmonics
(flat-topping into square waves) or all harmonics ( I've seen up to 7th with
someone txing down near 300Hz.
On Dec 11, 2017, at 14:22, Black Michael via wsjt-devel
<wsjt-devel@lists.sourceforge.net<mailto:wsjt-devel@lists.sourceforge.net>>
wrote:
Several people have reported seeing this....I saw it yesterday too for the 1st
time.
I don't think it's overmodulation otherwise we should see it more often.
de Mike W9MD B
On Monday, December 11, 2017, 1:17:27 PM CST, Daniel Ekman
<kne...@gmail.com<mailto:kne...@gmail.com>> wrote:
This is a example of some sort of overmodulation, I think, causing the tones to
spread out in four additional groups without decode. I don't really know what
is causing this, but as Jerry says it's not all strong signals that look like
this. Tried answering and that worked quite well. Running TS590S with built in
USB soundcard/serial. The next time I see this I will try to put the main
signal outside the passband and see if the other parts are still visible.
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