NEC-LIST: Re: NEC- wire conductivity vs discrete loads

The "wire conductivity" value to be used on the LD 5 line isn't the
conductivity of the wire as the name in the manual would imply. It's the
bulk conductivity of the copper. The actual linear wire conductivity is
determined by the bulk conductivity, the frequency, and the wire diameter.

Roy Lewallen

Robert Flanagan wrote:
> A simple example follows. It is a 1 meter wire of 101 segments. In one case
> it is loaded with 101 discrete complex loads of 10 +j0. This would seem to
> be approximate 1K ohm in the total 1 meter long wire or a wire of
> conductivity .001 mho/meter. The other case shown would seem to be
> approximately the same physical antenna, but the pattern results are
> radically different. What am I missing here???
>
> CM
> CE
> GW 1,101, 0,0,0, 1,0,0, .01
> GE 0 -1 0
> LD 4 1 0 0 10 0
> EX 0 1 51 0 1.0 0.0
> RP 0 181 1 1000 -90 0 1 1
> EN
>
> CM
> CE
> GW 1,101, 0,0,0, 1,0,0, .01
> GE 0 -1 0
> LD 5 1 0 0 .001
> EX 0 1 51 0 1.0 0.0
> RP 0 181 1 1000 -90 0 1 1
> EN
>
> Thanks in Advance,
> Bob

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