I agree it really sounds like arcing associated with power lines, even though
yours are underground. But I had that same sonic signature here, and the root
cause was a big TIG welder that a neighbor had just plugged into 240. Not using
it mind you, just idle. I told him something was generating noise in his garage
and when he threw the breaker, that was it. He was a qualified electrical
installer and right away he figured out there was probably a connection problem
in the welder. I never heard exactly what he fixed, but that solved it.
No problem at all triangulating it with my trusty loop antenna. It was 20 over
S9 on most bands...
http://wb9jps.com/Gary_Johnson/RFI_files/Handheld_DF_Antenna.pdf
73,
Gary Johnson NA6O
gwj@wb9jps.com
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