Date: Fri, 26 Jun 2020 21:33:25 -0700
From: Jim Brown <jim@audiosystemsgroup.com>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Do I need an insulator on the ends of my
dipole?
On 6/26/2020 11:07 AM, Kevin Zembower via TowerTalk wrote:
> Why do I need an insulator?
<Because the open end of an antenna is a high voltage point, and when the
<rope that holds it is wet, the RF can melt it and the antenna will fall
<down. Ask me how I know. :) If instead it's connected to an insulated
<wire, because it's a high voltage point, the insulation can arc over to
<the wire. The same is true of radials.
<73, Jim K9YC
## Does anybody know what the EXACT peak voltage is....on the ends of a half
wave dipole,
say with exactly 1000 watts cxr applied to the feedpoint ??? Say a 80m
dipole up 100 ft... flat swr, fed with coax + CM choke.
## what is peak Voltage at various points along the dipole ?? again with 1
kw cxr applied. What happens to peak V along the dipole as swr is increased
?
## I would have thought rain water was distilled water, high resistance...
but have never tested rain water.
Have tested store bought distilled water..and then compared distilled water
to tap water.... huge difference.
## I suspect dacron rope, when wet, is not much better than nylon rope.
Jim VE7RF
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