Powerline RFI is commonly at 120Hz - if it is being caused by a bad
connection or arching.... the acrching (and noise) takes place in each
"direction" of the a/c wave, so you get it at 60Hz X 2....
Check out Merv Loftless's book on AC RFI...or I am sure someone on the=
reflector will explain it in more detail...This isn't to say it could not be
something totally unrelated to AC RFI....but 120HZ RFI is normal for
powerline noise.
73 Greg
VA3VFO
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