[RFI] Peculiar Noise

[David Eckhardt]

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 <jim at audiosystemsgroup.com>
wrote:

> 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
>
>
>
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-- 

*Dave - WØLEV*