[Towertalk] NEC 4 Windows limitations?

[Mike]

Hi Jim,

The LPDA models I have seen, use a single source connected
to a balanced transmission line running the length of the LPDA.
The element connection to the transmission line are alternated
to create the phase reversal between elements. The model looks
very much like the physical antenna. I can send you an example
if you like.

73 de Mike, W4EF.........

----- Original Message -----
From: "jljarvis" <jljarvis@abs.adelphia.net>
To: <towertalk@contesting.com>
Sent: Monday, March 25, 2002 10:33 AM
Subject: [Towertalk] NEC 4 Windows limitations?


>
> Folks,
>
> I'm attempting to model stacked Log Periodics, and have run
> into what looks like a limitation in NEC 4 Windows.
>
> Each LPDA has 8 elements.  Each element has a source, with
> the phase reversing by 180 degrees on alternating elements.
>
> To stack, I duplicate the first LPDA, and change the Z height
> dimension.   When assigning sources, I discovered that they
> are limited to 9.  Must be some kind of stack overflow error,
> as the program crashes.
>
> Anyone care to offer an alternate approach to the problem?
>
> N2EA
>
>
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