[RFI] Line Noise Spectragraph
w9ac at arrl.net
Wed Nov 19 14:53:52 EST 2008
Once again, I am at my wits-end. Just when I got the utility company to
clean up a four-year noise issue, I now have this. Please see the linked
Beginning down around the BCB, I have the following noise pattern every ~ 56
kHz. The linked photo is centered on 3601 kHz but it extends well above and
below that. Span of the graph is 190 kHz.
The frequencies of this noise pattern do not change. Tomorrow or a week
from now, the pattern will look the same and the frequencies will be the
same -- so I would rule out a random power company arc of some sort where
the frequency and broadness changes.
In AM mode, I hear what sounds very much like an SCR buzz with no apparent
sign of modulation. It's always there (i.e., not something a neighbor is
turning on/off) Does this look like an electric fence? Plasma TV, fish
It is not coming from my home. I pulled the main 200A breaker and fed my
transceiver by battery power. All home alarm battery systems were
completely shut down and removed from their power source.
I will soon use a small SWBC receiver to try and hunt for this but after
four years of dealing with the other noise issue, I'm getting sick and tired
of feeling guilty when the neighbors want to know why I'm running all over
the place in our gated community.
Any help as to the pattern would be greatly appreciated and I mean greatly.
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