Re: NEC-LIST:old question on non-physical output

Hi there,

The first thing with automatically generated segments is their vast number
of digits beyond the decimal point. My observation with NEC2D is that it
misinterprets data expressed with more than 2 decimal places in millimeter
scale. You could safely round up all segments' coordinates prior to
simulation, and check currents after simulation.
Beside everything else others suggested, I noted this particular behavior
with reactive loads, such as bazooka, but everything converges nicely after
proper segmentation - try hard to keep lengths of facing segments equal.

Davor

At 15:58 2002.05.29 -0400, you wrote:

>I am generating some medium to large antenna files (800 segments)
>
>These antenna are generated automatically from a set of parameters. I do
>my best to make sure that I do not violate any wire rules, but even when I
>think there are no violations, I get strange results.
>
>For instance I may get negative port Z, or negative efficiency, or greater
>than 100% efficiency.
>
>sometimes I will have a reasonable feed Z and good efficiency, but the
>radiation pattern data is all -999.99 dB, Or the efficiency is ********
>
>
>Perhaps NEC4 is more forgiving of small segments, or maybe I just need to
>look into wire rule violations more.
>
>How should I interpret these strange simulation results?
>
>Wayne S
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