Re: NEC-LIST: Problems with SOMNEC and realistic ground

> Hello, I've been trying to model power line harmonic radiation from the
> local power distribution system using NEC2.
> The power lines I am modelling are above a flat ground, so I am using
> the Sommerfeld/Norton method. In my .nec punch card file I use "GE 1"
> (ground plane) and "GN 2 ..." (implying the Sommerfeld/Norton method). I
> am also using SOMNEC to create a TAPE21 file, as mentioned in the
> manual. However when I use the Sommerfeld/Norton method and run nec2 I
> get the following error:
>
> start: end of file
> apparent state: unit 21 named fort.21
> lately reading sequential unformatted external IO
> Aborted
>
> This does not occur when I don't use the S/N method, such as when I use
> a perfect ground. I have included my .nec file as well. Any help would
> be much appriciated.
 
Simon, I did some small tests with and without a pre-generated
SomNec ground-file, but was not able to produce similar error-
message.

I do not know what OS you are running and what nec2 executable
you are using.

When using the Sommerfeld ground with the original nec2 engine
this requires a pre-generated ground file, created with the
SomNec2d.exe program (at least on DOS/Windows).
However when no Som2d.nec file is available I get a distinct
error from the one you mentioned, so I don't believe this missing
of a SomNec ground input-file (Tape21) is causing theproblem....

Arie.

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