[TowerTalk] Rain drops noise on Yagi (dipole)

[Bob Shohet, KQ2M]

I have had difference experiences than Jim.  When the rain static is horrible (at the level where is sounds like the drumming section in a large marching band  ;-)   the the top yagi is always the loudest in Ierms of hearing rain static, it is NOT the only one that gets it and that has been true whether it has been 10, 15 or 20 meters.  What happens at my qth is that the top is the loudest by far, the 2nd one down is moderately loud, the 3rd one down has some static and the 4th one down (bottom) is quiet.

With lower levels of rain static, the top is still the loudest but the 2nd and 3rd one down may not experience any.

I use 5L Hygain HG205CA, 155CA and 105CA’s.

73

Bob, KQ2M


From: Jim Thomson 
Sent: Wednesday, December 05, 2018 12:50 PM
To: towertalk at contesting.com 
Subject: [TowerTalk] Rain drops noise on Yagi (dipole)

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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