Topband: Local noise source identification

[Rick ve3mm]

I am looking for suggestions to help identify a local noise that I am
experiencing on topband.

It's characteristics are;
- bandwidth approximately 15 kHz
- amplitude relatively constant
- centre frequency seems to vary in small steps over time, no real pattern.
- right now the centre frequency is 1819 kHz, it moves up and down up to 7
or 8 kHz.
- does not seem to be present during the day. At least not this afternoon.

I shut down all of the circuits in my house other than my shack and it did
not disappear.

Has anyone experienced something similar?

73

Rick ve3mm