I see these exactly birdies on 15m in didi when attached to USB. I can lower them with clip on ferrites and USB cables with better built in common mode isolation but not fully remove them.
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I'm very interested in whether folks have good mitigation suggestions for this. I'm quite certain that it's aliasing of the cat control signals. They disappear completely if you disable CAT control and only watch the waterfall in WSJT-X.
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Greg
N1TR?
