[TowerTalk] Polarity question..on a dipole

john at kk9a.com john at kk9a.com
Fri Mar 31 20:38:14 EDT 2017


I have had temporary dipoles touch branches and there was no issue however
the areas touching were closer to the dipole center than the ends. So if you
can avoid having the ends touch it may work with regular THHN wire.

John KK9A


To:	Tower Talk <towertalk at contesting.com>
Subject:	Re: [TowerTalk] Polarity question..on a dipole
From:	Doug Smith
Date:	Fri, 31 Mar 2017 15:17:01 -0600

Voltage at dipole tips - it's a kind of interesting question.  

I was thinking of putting a dipole in a stand of aspen trees which I do NOT 
want to burn down.  There is no way to route the wires to completely avoid 
contact with the twig-like upper branches.  And, I do run full power.

I did find some high voltage wire by Gore that is rated at 13 KV although
I'm 
not sure that was at RF - might have been DC.  It is insulated with PTFE.  
Looked interesting..

The idea of looking at the feed point impedance of a 1 wavelength doublet
for a 
first order approximation is a good one.  I may try modeling that, just to 
bring closure to my idea..

73,
Doug, W7KF



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