Just a note, perhaps this will help someone -
I've been dealing with noise on different band - a slow drifting crud, about
8kHz wide. It sounds a lot like the drifting crud I got from a 12v/25A Radio
Shack switching power supply that I owned for about an hour before I took it
back.
Tonight I found the source! I have a Honeywell electronic air filter in my
return air line. It has a high voltage DC switching power supply to charge the
elements.When I turn it off - the noise is gone!
I don't think line filters will help - I'm might try running a separate ground
line to a water pipe, but I think I'm stuck with having to turn off the device
when I operate my ham radio.
....so, don't forget those electronic air filters when you're trying to find
electrical noise. 73's
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