[TowerTalk] Modeling a ground plane

[Larry Banks]

Hi Bill,

I just built one of these with radials at 10'.  Check out my write-up at the 
bottom of my home page: http://www.qsl.net/w1dyj/.

I don't have a real answer to your question, but it probably has to do with 
the effect of "ground."  I don't remember seeing much difference when I 
changed the radial vs. vertical length, but I changed them at the same time, 
so I didn't perform the same experiment.

73 -- Larry -- W1DYJ



-----Original Message----- 
From: Bill Turner
Sent: Wednesday, September 10, 2014 11:11
To: Towertalk
Subject: [TowerTalk] Modeling a ground plane

I am modeling a full size ground plane with four elevated radials for
40 meters using EZNEC v. 3.0. I have it six feet above ground.

I noticed that changing the length of the radials has much less effect
on the resonant point than changing the vertical element.

For example, on 40 meters, changing the vertical element by one foot
moves the resonant frequency by about 200 kHz, but changing all four
radials by one foot moves the resonant frequency much less, only about
20 kHz or so.

I'm curious why this is. I would have thought the effect would be the
same.

All comments appreciated.

73, Bill W6WRT
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