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Re: [TowerTalk] Fwd: OCFD

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fwd: OCFD
From: Patrick Greenlee <patrick_g@windstream.net>
Date: Sun, 26 Mar 2017 12:44:53 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>


On 3/26/2017 12:17 PM, Hans Hammarquist via TowerTalk wrote:
Hi Jim,
Everything has a capacitance to somewhere. Even Mother Earth has a
capacitance. You can select what reference point you like, Moon, Sun, Pluto. I
never really grasped it myself when I took my classes in physics.
Anyhow, there is a distributed capacitance along the dipole wires that get,
  what's called, end-effect. That's why you don't cut the dipole to exactly
1/2  wave length but a little shorter, most around 95%.
We all, I hope, know that the voltage is highest at the tips of the dipole
(or 1/4 wave verticals for that matter). That's why you put a good
insulator at  the dipole ends, not just a non-conducting cord (what might catch 
fire
a rainy  day).
Just my dime to the conversation, Hans - N2JFS ____________________________________
## BTW,  when you mentioned dipoles etc, having all their voltage at the
tips,as
a  result of capacitance,  capacitance between what and what ?    Is it
capacitance
between the tips, like in an arc ?    I cant  see it being C to ground
below.  What
if the dipole is in outer space  ?

Jim   VE7RF

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