[RFI] Peculiar Noise

[Jim Brown]

On 12/23/2023 1:28 PM, k1ttt.dave at 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