As I recall, from my experiences with RADAR, one of the main reasons for
the installation of a radome was to limit exposure of the antenna from
the rain and snow events, as well as to protect the antenna from damage
by weather events.
I have never observed St. Elmo's fire inside a radome. Of course, being
inside a radome while the RADAR is in operation is not a healthy
environment. Severe weather events, high winds and precipitation can and
do effect the RADAR systems efficiency to some degree, notwithstanding
the frequencies at which RADAR operates. Perhaps the insulation on
wires, or the containment of the driven element in a radome at high
frequencies would have a similar affect.
73, Chuck, W6AJW
On 12/05/2018 09:50, Jim Thomson wrote:
Date: Wed, 5 Dec 2018 11:03:12 -0500
From: "john@kk9a.com" <john@kk9a.com>
To: towertalk@contesting.com
Cc: guidoted@gmail.com
Subject: Re: [TowerTalk] Rain drops noise on Yagi (dipole)
<The rain static solution is in the towertalk archives 1 Apr 1997
http://lists.contesting.com/_towertalk/1997-04/msg00023.html
<John KK9A
## Its always the very top yagi, regardless of how many yagis on the same
tower. The lower yagis never seem to be affected.
Perhaps the..fix is to install the smallest yagi you can get away with..at the
very top of the tower..or mast above the tower...
that will kill the rain and or wind static..or st elmos fire..or whatever the
heck is actually causing it. The top ant does not need coax either.
Perhaps something like a 1-2-3 el 10m yagi..or TA-32, TA-33, or just enough
aluminum at the very top to kill the noise to the actual
yagis below it, that are being used.
## I have heard the same story at least a doz times now..even if they are DC
grounded eles... like a Hy gain 204BA. .
Its always the very top yagi that gets the noise..and never the lower yagis.
Some type of sacrificial top...yagi / al may well do the trick.
Jim VE7RF
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