I believe the segment length should be at least 4X the segment diameter.
On Fri, Jul 12, 2019 at 2:02 AM David Gould <dave@g3ueg.co.uk> wrote:
> Most of my modelling has been with wire antennas but now I am modelling
> some verticals with elements having diameters of between 38mm and 25mm
> for 20m and 40m (and using drooping elevated radials made of wire)
>
> I usually use around 9 or 11 segments for a 1/4 wave element. I noticed
> that when I changed the number of segments the results for things like
> feed impedance changed quite dramatically.
>
> Are there some guidelines for the number of segments for a 1/4 wave
> straight wire element?
>
> How is the choice of segment length affected by the diameter of the
> element tubing? Is there a limit on the ratio of segment length to
> segment diameter?
>
> 73,
>
> Dave G3UEG
>
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