Phil,
I would suggest that you eliminate sources within your home
as noise sources before you search elsewhere. There are hundreds of
potential noise sources in homes. Just a few examples would be: CFL and
LED lights, low voltage lighting systems, electric blankets, air conditioner
and heating systems and fans, electronic igniters in stoves, ovens, and
boilers, most power supplies, plasma TV's, internet routers, doorbell
transformers starting to go bad, battery chargers. You get the idea..nearly
anything electronic, even devices that are turned off. So it would probably
be easiest to turn off circuit breakers one at a time, or perhaps just turn
off the main breaker and run a radio on battery power. I am sure others
will offer many suggestions also. If your house is OK, you might drive
around the neighborhood with your AM BC band radio tuned to a blank spot
near the top of the dial and possibly you will get a real general idea of
the extent of the problem. However at low frequencies like the BC band,
noise/rfi can be propagated long distances (like 1000's of yards) over power
lines, so the use of a directional antenna on something like an AM aircraft
band portable, or possibly even a 6 or 2 meter AM, CW, or SSB receiver would
be much better for localizing the "noise".
There has been much written on the internet and ham
publications on locating and fixing "noise".
Good Luck, Rick KL7CW
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