-----Original Message-----
From: mike W2LO
There are two ordinary wooden "telephone" poles in my neighborhood
carrying just H/V and telephone lines-no transformers, etc.-just the wires
supported by two insulators. Occasionally when I pass them while walking,
there is a fairly loud hum coming from them. Touching the pole you can feel
this loud hum. Oddly these two noisy poles are separated by a non-humming
pole, that is, there is a humming pole, 150 feet or so later there is a
quiet pole and 150 feet later a noisy pole.
These poles sometimes hum and sometimes not. I don't detect any RFI from
them but is this indicative of trouble in the making? I walk extensively
through the neighborhood but haven't detected any other noisy pole besides
these two.
****The wind or small air movements are exciting the wires to a resonance
condition.
Brian G
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