I'm having more trouble than I expected localizing my power-line
interference. In particular, one component of the interference varies
from almost negligible to whopping big, as visualized on HDSDR, and
often appears in wide bands 22 KHz apart.. See the Dropbox link
<https://www.dropbox.com/s/qaxt7qnyl51hnp3/hum%20bars.png?dl=0> for a
visual. You can see the hum every 120 Hz on the audio display - when I
move the AM passband away from the hum bands, the 120-Hx
multiplesessentially disappear. The bands themself vary, without
apparent pattern, from very strong - as seen in the illustration- to
invisblle/inaudible. Just now, they stuttered a few times and then
disappeared from the waterfall (and the audio) entirely, in the course
of a few seconds. With the AM passband in one of the hum bands, the
base noise level is about S9; without them, it is S7, which still isn't
great, but worst things first.
Really puzzling - any advice on what I'm seeing and how to track it down
will be much appreciated.
--
73, Pete N4ZR
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