Some years ago I had a problem that could be described that way. I have the
2nd rx installed so there are two synths. I switched them around and the
problem went away. Shortly thereafter, I upgraded the synths to the K3A
type, so I didn't pursue it further.
Good luck.

Victor 4X6GP

On Fri, Jan 16, 2026, 16:04 Mike Maloney via Elecraft <
[email protected]> wrote:

> Anyone else ever heard Double Side Tone TX output from K3 in CW mode?
> 73, Mike AC5P
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