NEC-LIST: Helix in NEC-2

Although the NEC-2 manual I have doesn't mention it, most of the NEC-2
codes floating around have a subroutine to generate a helix structure in
response to a GH "card". Unlike the NEC-4 implementation, the NEC-2
routines seem able to generate an oval helix, with separate X and Y
radius specifications.

An oval axial mode helix would produce an elliptically polarized signal,
and I don't immediately see the advantage that would have over purely
circular or linear. And an oval cross section would seem to be an
uncommon construction for a normal mode helix.

Does anyone know of any application for this, or have any idea why this
ability was incorporated in NEC-2?

Roy Lewallen

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