On 12/23/2023 1:28 PM, k1ttt.dave@gmail.com wrote:
I tracked down a noise like that many years ago to a tv preamp on an
external antenna, would wander up and down the band but occasionally liked
to park on a local repeater input..
This can be either instability in the preamp or from an SMPS PSU. Years
ago, we traced that sort of issue to instability in the preamp for
wireless microphone receivers. It helped that the contractor on the
project was a ham.
73, Jim K9YC
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