[TowerTalk] Rain drops noise on Yagi (dipole)

[Charles Farr]

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 at kk9a.com" <john at kk9a.com>
> To: towertalk at contesting.com
> Cc: guidoted at 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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