Try FM demodulation. I have something much like that on 160-meters. It's
from one of the more-or-less local FM BC stations mixing with an AM
station.
Dave - WØLEV
On Sat, Dec 23, 2023 at 10:06 PM Jim Brown <[email protected]>
wrote:
> On 12/23/2023 1:28 PM, [email protected] 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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--
*Dave - WØLEV*
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