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Re: [Antennaware] Modelling transmission lines.

To: <>,"David Gould" <>
Subject: Re: [Antennaware] Modelling transmission lines.
From: "Guy Olinger, K2AV" <>
Date: Sun, 13 Mar 2005 23:45:50 -0500
List-post: <>
Many antenna programs have a method for placing a simple transmission 
line in the model.

EZNEC, for instance will allow you to define a very short wire (like 
one inch) place it just about anywhere at a distance from the antenna 
wire parts, and define a transmission line (including substituting a 
specified length for the actual distance). You then place a source on 
the short wire and you can run impedances on it. Great for coming up 
with tuned feeder multiband solutions.

This presumes that you can drop a balanced feedline directly down, or 
in a way that it's equally influenced by both halves of the antenna.

What model(s) are you using?

----- Original Message ----- 
From: "David Gould" <>
To: <>
Sent: Sunday, March 13, 2005 2:03 PM
Subject: [Antennaware] Modelling transmission lines.

>I have been modelling verticals and dipoles for some time, but am not 
> knowledgeable on transmission lines.  I wondered if anyone could 
> explain
> how to add a transmission line or had a file that was similar to 
> what I
> want to do.
> I am trying to model a 160m inverted V dipole with the centre at 
> 75ft with
> 75ft of open wire feeder (eg 450 or 600ohm) coming down to ground 
> level.  I
> am trying to find what impedances the atu will have to deal with at 
> ground
> level.  (I know what the impedances are at the dipole centre 75ft 
> up.)
> Any help would be much appreciated.
> 73,
> Dave G3UEG
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