Two three that come to mind over and above those mentioned by others are
Power line arching
Solar panels
Wind generators
Both of the latter can feed the grid through a switch mode system.
See radio communications August 2011 (Radio Society of Great Britain).
73
David W Wood
Ham call - G3YXX
FOC # - 1685
Licensed - 1969
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]] On Behalf Of Buddy Brannan
Sent: Wednesday, December 07, 2011 4:02 AM
To: [log in to unmask]
Subject: Terrible, hideous noise!
I get to have fun trying to track down some noise.
Seems that when it's on (a lot), it runs from 40 meters all the way =
through to 17 meters. Good S9, takes out the whole band. I thought it =
might be the new Roadrunner go fast sideband cable modem, but I =
unplugged it with no change. Thought it might be the blower in our =
furnace, but turned off the thermostat with no change either. Thought it =
might be the ethernet over house wiring adapters, but I've had a couple =
of them running since August, but the noise has only started with a =
vengeance during the past few weeks. It was intermittent, but now pretty =
constant, which makes me think it's something Winter or holiday related, =
but absolutely no idea what yet. I'm not even sure it's being generated =
at my house, could be something from a neighbor. That I hear it more =
often in the evening lends some credence to this theory. Lovely buzzing =
static. I'm somewhat inclined to blame the high speed Internet, but more =
at the cable drop, maybe, and not the modem itself, as I started =
noticing it when we got the sideband Internet service. Could be =
coincidental though, as I don't hear it all the time. Anyway, it's very =
annoying. Not expecting a lot of suggestions, mostly just bitching. LOL
--
Buddy Brannan, KB5ELV - Erie, PA
Phone: (814) 860-3194 or 888-75-BUDDY
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