For a long time I had a similar puzzling noise on 20m that shifted in
frequency when the central air conditioning unit came on/off. As I'm on
that band only for contests with a low fan-dipole antenna it wasn't a
high-priority item to track down.
Then one day with a 30-50 MHz receiver on I happened to walk thru the
dinette and heard it. It was quickly isolated to the charging unit for
a pair of (c. 2002) Cobra FRS handhelds there.
Sometime before this that circuit had triggered a warning on an APC UPS
unit when plugged in there. A Klein RT100 tester says "open ground".
From the get-go here in Jun 1972 it had been noticed that some
non-polarized plug metal appliances would present a tingling to the
touch if plugged in one way. If this had been determined to be a
contractor-wiring error at the start a demand for remedy would have been
instituted.
73, Pat - WA5IYX
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