On 7/21/2025 9:33 AM, Michael Carter via Elecraft wrote:
To me it sounds as though you're tuned to the sideband of a wide CW signal,
which I've heard on occasion. This results in the sound of modulated noise
rather than a pure tone.
This is "phase noise," which is a distortion product of the synthesizers
of both transmitters and receivers. There's a study of phase noise in
transmitters on my website, which is an analysis of ARRL Labs data from
about ten years ago. They sent me raw data in digital form, which I put
into a spreadsheet and formatted it to display data for all of the
tested radios on the same graph. Clicks, which are the result of IMD,
and phase noise are plotted separately.
http://k9yc.com/TXNoise.pdf
73, Jim K9YC
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