NEC-LIST: Problem using arcs

Hi,

I'm new to NEC and still making silly mistakes so please forgive me if
this is trivial.

I am trying to simulate the radiation from a small loop antenna (20 cm
diameter). If I approximate to it using an octagon I get reasonable
looking results in terms of impedance and radiation pattern but if I
use the GA card to construct a true circle I get get results that are
clearly nonsense. Can anyone tell me what I am doing wrong?

The two files follow - thanks in anticipation.

Regards,
        Russell

Russell Eberhardt

Telecam Electronics Ltd
Web Site: http://www.telecam.demon.co.uk

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CM Octagonal Loop
CE
GW 1 3 -.0414 0 -.1 .0414 0 -.1 .003
GW 2 3 .0414 0 -.1 .1 0 -.0414 .003
GW 3 3 .1 0 -.0414 .1 0 .0414 .003
GW 4 3 .1 0 .0414 .0414 0 .1 .003
GW 5 3 .0414 0 .1 -.0414 0 .1 .003
GW 6 3 -.0414 0 .1 -.1 0 .0414 .003
GW 7 3 -.1 0 .0414 -.1 0 -.0414 .003
GW 8 3 -.1 0 -.0414 -.0414 0 -.1 .003
GS 0 0 1
GE 0
EX 0 1 2 0 1 0

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CM Circular loop
CM 10 cm radius, 6 mm wire
CE
GA 1 9 .1 0 180 .003 0 0 0
GA 2 9 .1 180 0 .003 0 0 0
GS 0 0 1
GE 0
EX 0 1 5 0 1 0

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Received on Sun Dec 06 1998 - 16:54:09 EST