NEC-LIST:old question on non-physical output

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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