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Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type

To: Dan Zimmerman N3OX <n3ox@n3ox.net>
Subject: Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type
From: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 21 Nov 2008 09:02:37 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Voltage baluns for antennas have never made sense to me,
except for Yagis.  They have three output terminals, 0 degrees, 180 
degrees, and "ground".  On a Yagi, the boom might actually
work as an RF ground, plus the load is well balanced.
How you would connect a voltage balun to a vertical and its
ground screen is completely unclear.  I also don't know
why you would want the 4:1 ratio.

Rick N6RK

Dan Zimmerman N3OX wrote:

> Any 4:1 voltage balun feeding an unbalanced antenna would cause this
> problem.  Actually, in one sense, the better the balun, the worse the
> problem, because the better the balun the more it forces your coax shield
> above ground. ;-)
> 
> A poor voltage balun would probably just overheat instead of forcing massive
> currents down your coax.
> 
> 73
> Dan
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