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Old July 29th 07, 05:59 AM posted to rec.radio.amateur.antenna
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Posts: 442
Default Wind Noise


"Cecil Moore" wrote in message
. net...
Al Lorona wrote:
I have read many times here about how noise is generated when wind

strikes
an antenna made of bare conductors.

Does the same effect occur on a mobile antenna?


If you are talking about precipitation static,
defined at:

http://www.atis.org/tg2k/_precipitation_static.html

the problem is severe and well-documented for airplane
antennas and therefore would exist for mobile antennas.
But air alone passing over an antenna is not sufficient
to produce the effect. For precipitation static to occur,
the air must contain precipitation in the form of
charged particles of dust, snow, rain, etc.
--
73, Cecil http://www.w5dxp.com


Navy receive whip antennas are all fitted with a "static drain resistor" (50
k-ohm, I think) in a connection box at the base. We had to disconnect the
resistor to megger the element during inspections. Evidently, precipitation
static could and would build up to a hazardous DC potential.


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