[time-nuts] Quadrifilar Helix Antenna

David Kirkby david.kirkby at onetel.net
Sun Jun 10 01:59:21 UTC 2012


On 10 June 2012 02:05, gary <lists at lazygranch.com> wrote:
> My recollection is NEC2 has a bug (i.e. can't model) conductive booms.

It's not a bug.

Essentially the current is assumed to flow in the direction of the
segment, which is not the case on a boom. It's that assumption that
worries me in using it for things like a helix, or most things to be
honest. I'm sure it can do a lot more than I trust it to do, but I'm
never confident the model will be accurate.

> Otherwise I thought it was pretty accurate.
>
> It sure is a kick in the groin to use.

MMANA-GAL has quite a nice front end. It is one hell of a lot easier
to use than HFSS, but I trust HFSS more.

Dave



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