Re: NEC-LIST: Plotting circular and part-circular antenna elements

At 09:08 AM 7/14/2008, D. B. Miron wrote:
>Jim, isn't there a GA command for doing arcs?---Doug Miron

Doh..

Of course.. it's GA (and appeared at the bottom of the previous page
when I was looking at the list of cards..)

>"Jim Lux" <james.p.lux_at_jpl.nasa.gov> writes:
>
>Quoting Pete Smith <n4zr_at_contesting.com>, on Sat 12 Jul 2008 03:08:58 PM
>PDT:
>
> > I occasionally need to plot at least a quarter-circle when modeling
> > real-world antennas - an example is my K3LR lazy-vee array for 80m,
> > where the bottom half of each dipole describes something approaching a
> > quarter-circle on its way from the feedpoint to the bottom end (back at
> > the tower). It would clearly be a better model to describe that lower
> > element as a quarter-circle than as a straight line, for NEC's purposes.
> >
> > Does anyone have a table that describes a 2-dimensional circle in terms
> > of X and Y coordinates? I'd prefer not to reinvent this particular
> > wheel if it already exists somewhere.
>
>there's a couple ways to do this without the coordinates.
>Use GR card (which I've never used...)
>
>Use GM card to make multiple copies of a sort segment rotated around
>the axis of interest, then another GM to move it.
>
>A zero height helix can also do it (although one of the online manuals
>warns of a divide by zero)
>
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