At 11:55 AM 5/1/01 -0700, Charles Johnston wrote:
>
>The source of the RFI need not be in your immediate neighborhood. I had the
>local power company out here twice to track down an s9+ noise that was
>across my entire HF received spectrum. The first time they gave up after
>about 1 hour. I called back and persuaded them to come back.
>
>This time they sent their RFI specialist. He found it in about 4 hours. A 4
>inch long blue arcing at the nearby power sub-station. Which I could have
>seen it....anyway we called me on his cell phone from the sub-station and
>temporarily squelched out the arcing...my noise went down to s1.... then he
>allowed the arcing to resume and back it went to s9+
>
>The sub-station was a full 3 miles away........
Sure, and I betcha that arc was audible throughout the HF spectrum and beyond.
I believe the notion that arcing heard only at higher HF frequencies is
likely to be quite close still holds, at least as applied to arcs of the
usual magnitude for house-to-house distribution. Wth 4-inch blue flames
all bets are off.
I recently found a VERY loud 80-meter intermittent arc that I was afraid
might be some distance away. turned out to be a defective
electrically-heated dog dish that was well within the near field of my
80-meter array, in my next door neighbor's breezeway.
73, Pete N4ZR
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