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Re: [TowerTalk] Multi-band dipoles

To: Rik van Riel <>
Subject: Re: [TowerTalk] Multi-band dipoles
From: David Gilbert <>
Date: Fri, 22 Apr 2011 14:57:34 -0700
List-post: <">>
I don't buy it.

a.  I didn't want to bring up the topic of corona noise and rain static 
since I consider those to be fringe effects.  Besides ... as far as 
corona effects are concerned I don't think there is any benefit for a 
folded dipole that a wire dipole with a small loop of equivalent radius 
of curvature at the ends (such as would naturally occur at an end 
insulator) wouldn't have.  Can you explain why there would be?  Both 
antennas would have the same impedance at the end for any particular 

b.  Symmetry isn't the issue.  Seriously ... how do you figure a TFD is 
more symmetrical than a standard doublet??   Both require a balun to 
properly couple to coax anyway.

Dave   AB7E

Rik van Riel wrote:

> There are a few additional reasons why it could be
> quieter.  Specifically, the antenna is a loop (albeit
> with a resistor), which means it is always electrically
> symmetrical and less sensitive to corona noise.
> The electrical symmetry means the antenna is less
> sensitive to common mode noise that is transported to
> the antenna from the feedline.
> Of course, a delta loop has these same characteristics.

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