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[TowerTalk] Shunt feeding tower damages rotor

Subject: [TowerTalk] Shunt feeding tower damages rotor
From: Paul Baldock <>
Date: Tue, 18 Sep 2007 13:39:33 -0700
List-post: <>
I have an M2 rotor at the top of my 130ft Tower fed with shielded 
cable, and a TIC ring at 92ft fed with non-shielded cable. I shunt 
feed the tower for 160M. All as has gone well for a couple of years.

I just changed the top antenna (much more capacitance) and had to 
re-tune the tower shunt feed. This of course changes the 
voltage/current distribution in the tower.

Having put 1.5KW in to the tower it seems that I damaged the TIC 
Ring. At the tower the TIC ring consists of a floating motor with 
.1uF to ground (the tower). The feed back pot is also floating with 
.01uFcaps to ground (the tower). From measurements on the ground it 
appears that  I have damaged one or both of the Pot Caps to ground to 
cause them to be leaky.

The question is, should I just remove the Pot Caps, or replace them 
with beefier caps, or stop shunt feeding the tower.


- Paul  KW7Y


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