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Re: [TowerTalk] Dipole fed with balanced line?

To: Paul Christensen <>
Subject: Re: [TowerTalk] Dipole fed with balanced line?
From: Ken <>
Date: Tue, 17 Jan 2012 13:31:32 -0500
List-post: <">>
On Jan 17, 2012, at 10:52 AM, Paul Christensen wrote:

> With top loading for verticals, or end-loading for dipoles, super high 
> efficiency can be maintained.  I would start by reading Sevick's work as a 
> general analysis of shortened antennas, and also study how and why a 
> radiator's feedpoint Z, I, and E changes with radiator length.


THERE I agree with you because the high current portion (e.g. center portion of 
a dipole, or the "effective" quarter wave portion of a vertical) is used as a 
radiator.  End loading works well because the high current section of a half 
wave is still the radiator), but just using the ends of a dipole (e.g. center 
loading,etc.) is not nearly as effective.   

Shortening a half wave dipole, without end loading, significantly reduces it's 

A 70' dipole used on 80m without end loading is much less efficient of a 
radiator than the same antenna with end loading.   And the simplest way to end 
load such an antenna is to add about 30' of wire on each end ;-)  


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