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[TowerTalk] Shunt Feed Capacitor for Tower

To: <>
Subject: [TowerTalk] Shunt Feed Capacitor for Tower
From: (
Date: Fri, 8 Feb 2002 11:34:49 -0600
Another solution to the high voltage problem at the
insulated end elements of F12, KLM, and X7 / X9
antennas would be to install a relay to short the 
center of the end elements to the boom when
you want to use the tower as a vertical, leaving
the relay OPEN when you use the beam.

Tom  N4KG

On Thu, 07 Feb 2002 16:52:06 "Howard Klein" <> writes:
> What effect does grounding the elements have on the performance of
> >the beam?
> >MOST = All Cushcraft and HyGain tribanders and monobanders
> >except for the Log Cell DE's in the X7, X9, TH11,  all Mosley
> >beams except for the insulated DE's and LP antennas.
> But of course I was thinking of the exceptions. I use an X-9 on a 70 
> ft 
> tower which I shunt feed. I rarely have arcing problems unless  
> something 
> goes out of whack. This occasionally happens when we get some winds 
> that 
> blows my shunt wire around or  gets my feed lines swinging in the 
> breeze. 
> Fortunately my Acom shunts down quickly and does send the arc fault 
> msg. I 
> use a Gamma match but find I need better than a 5K vacuum var. I 
> measure the 
> capacitive value in the order of 300pfs.
> Howard M. Klein, K2HK
> ARRL Life Member
> DXCC Honor Roll
> 362 Confirmed Countries
> A1 Operators' Club
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