Re: NEC-LIST: null result

Quoting William Robbins <wrobbins_at_ssd5.nrl.navy.mil>, on Sat 12 Jul
2008 10:19:58 AM PDT:

> Hi-
> I'm attempting to run simulation which includes on the order of 10^2
> resistive wires. One of those wires is being stimulated by a voltage
> source, and the frequency is being swept over the range of a few MHz to
> a little more than !0^2 MHz.
> NEC appears to begin the simulation and for whatever reason, terminates
> in less than one second. There is no error message, and the output file
> is empty.
> I'm curious if there are:
> 1. limitations on the number of wires that can be simulated?
> 2. a minimum spacing that is required between wires? (My shortest
> spacings are 0.0254 meters between wires with 1mm diameter.)
> 3. other issues that I may be missing which might cause this behavior?
> cheers
> -Billy Robbins

Something else is wrong. Do you get the initial startup message?

There's a limit on the number of segments, but it's typically huge
(you say 100 wires.. is that 100 segments, or 100 wires with many
segments each). Depending on which version of the program you are
running, you'll have different limits (since FORTRAN does static
allocation of the arrays, it's a compile time change).

1mm wires that are 1cm apart aren't a big deal.

Have you tried downloading and using 4nec2? It comes with the
standard NEC2 engine and some test cases.

>
>

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