On 2/15/2022 10:42 AM, Michael Black via groups.io wrote:

That sounds like RFI in the shack....notorious on USB devices and is band and power sensitive.You should find that if you turn power way down the problem goes away.Chokes on ALL wires -- USB cables, speaker wires, etc.

That's a "band-aid." The proper solution is grounding and bonding. See N0AX's ARRL book on the topic, to which I contributed, and/or these slides for tutorial talks I've done at Visalia, Pacificon, and to some local clubs.

http://k9yc.com/GroundingAndAudio.pdf

Also effective chokes at the feedpoint of every antenna.

http://k9yc.com/2018Cookbook.pdf

73, Jim K9YC