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[TowerTalk] Modelling Dilemma

To: towertalk@contesting.com
Subject: [TowerTalk] Modelling Dilemma
From: N4CW@aol.com
Date: Thu, 9 Sep 2004 20:59:10 EDT
List-post: <mailto:towertalk@contesting.com>
Using EZNEC 2.0, I model a one-wavelength wire at 50 feet above real ground 
("normal"), and feed it at 50% from one end. I get a pattern that has nulls off 
the ends of the wire. If I change the feed point to 25% from that same end, 
the pattern has nulls off the sides ("normal" to the axis) of the wire.
I didn't realize changing where an element is fed would alter its radiation 
pattern. 
I am plotting the "total" field in an azimuthal plot. 
I'd appreciate someone explaining why this happens or pointing me to some 
readily-available reference material.
Thanks,
Bert, N4CW/1
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