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kbarbbr

What is this weird sound ?

I'm asking for my mother who's in Berkeley, CA.
I can't seem to find a totally appropriate forum area to post in, so I'm trying here . . .

There is some high frequency sound that's audible during the day, and no one can figure out where it's coming from or even from which direction.
It doesn't start until 11:00am and ends at 1:30pm +/- .

It's much fainter than the sound clip, which is at a link that should show up below.
(The banging and knocking sounds are just the iphone operator's.)

I've heard some pest control devices before, but they didn't have the drop-off in tone as this one does.

The only thing I can think of is, the phone company pressurizes their big lines on the poles and perhaps it's a pinhole leak.

Anyone have any other ideas ?

Thanks,

Kent

Here is a link that might be useful: Mom's weird garden sound

This post was edited by kbarb on Tue, Sep 9, 14 at 13:09

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