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

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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