[RFI] Arrestors

[Hardy Landskov]

There has to be an arc to excite the wire to cause electromagnetic 
radiation. This is what you hear in you radio. Along with that there is 
audio radiation in the 25 to 50 KHz region that is detectable with 
ultrasonic devices. Since the audio wavelength is very short compared to 
electromagnetic wavelength, it is easy to make detectors that can pin point 
insulators, bolts, and other hardware that are the culprit(s) causing the 
interference. The amount of audio radiation from an arrestor I am not 
familiar with but it is some.
There are people on this reflector that can give you more details. Where 
there is an arc, there will be ultrasonic radiation also.
Hardy N7RT


----- Original Message ----- 
From: <wd3c at aol.com>
To: <rfi at contesting.com>
Sent: Monday, March 28, 2011 6:58 PM
Subject: [RFI] Arrestors


> Am I mistaken in the belief that ultrasonic detectors will not detect bad 
> lighting arrestors?
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