Re: NEC-LIST: ex card near open wire end

Good day Jeff et. al.,

I see that your coffee can models use surface patches. I've
been writing and running wire-grid cylinder models lately,
with no problem in 4nec2 v5.4.1. The bug may have something
to do with the patch-wire connection.

Regards,
Doug Miron

"Jeff Liebermann" <jeffl_at_ihwy.com> writes:

At 08:39 AM 12/25/2004, you wrote:
>Can anyone point me towards information why an ex card near
>an open wire
>end is a bad idea?
>I've recently upgraded to using 4nec2 version 5.4.1 and it
>gave me a
>warning on this model. The waring:
>Error: Wire 1, seg 1 (tag 1), EX-src: Not allowed near open
>wire-end.

Downgrade. Your model works as expected using 4NEC2 version
5.3.9.
I just tried it.

I'm also getting the same error message in 5.4.1 using
coffee
can antenna models. For example, if I try Trevor Marshall's
coffee can 2.4GHz antenna model at:
    http://www.nec2.org/coffee.txt
It works with 5.3.9 but blows up with the same error in
5.4.1.
5.4.1 also will not read the .out file from this antenna
created
by 5.3.9 and bombs with a strange error message (which I
forgot
to save) followed by a graceless program exit. Removing the
.out
file allows the program to continue, but belches the above
EX
error message. In addition, both the wire grid and solid
antenna
models are seriously mangled in 5.4.1 and do not look like
anything
like a coffee can. Same problem with coffee cans generated
by
Ivor Hewitt's can antennas.
   http://www.ivor.it/wireless/cantenna.html
and mine. Methinks 5.4.1 is broken, somewhere.

I'm was in the process of producing a bug report, but I'm
having
trouble tracking down the exact cause (mostly because I'm
just
a beginner with antenna modeling).

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