That indicates failure to do proper bonding of the coax to ground before
it enters the shack. If that's the case, it's likely that there are
other bonding failures.
It's worth studying N0AX's ARRL book on the topic, to which I
contributed, and/or this slide deck pdf for talks I've done at
Pacificon, Visalia, and to several ham clubs.
http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
On 9/15/2021 2:39 PM, Neal Campbell wrote:
I have seen it induced by routing coax near the computer or and wiring
connected to the computer also.
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