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Re: [TowerTalk] elevated radials vertical

To: TowerTalk@contesting.com
Subject: Re: [TowerTalk] elevated radials vertical
From: "KF6PYF@blaze1024.com" <KF6PYF@blaze1024.com>
Date: Fri, 08 Jun 2007 01:38:53 -0700
List-post: <mailto:towertalk@contesting.com>
Al Williams wrote:
> Our club is planning to use an elevated vertical for fd 40 m.  I have been 
> tasked to use EZNEC to determine length of the vertical and radials given a 
> feedpoint 10' above ground.
>
> EZNEC reports good vswr with a 4" alum pipe vertical element 33.1' and 
> radials 32.5' of #22 wire.
>
> However the elevation pattern and gain using real ground shows virtually no 
> difference with 0,2,4, and 8 radials. The source impedance jumps from highly 
> reactive with no radials to 50 ohms mostly resistive using two radials and 
> lowers a bit using 4 and 8 radials.
>
> The pattern and gain being nearly identical no matter how many radials are 
> use (including none) has me wondering if I have something wrong in my model?
>
> All comments appreciated, please.
>
> k7puc
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I think you are confusing buried radials with elevated radials. The only 
time you start seeing a drastic change when adding lots of radials is 
with ground mounted verticals utilizing buried radials. With elevated 
radials about two per band seems to work just fine 
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