Fwd: RE: NEC-LIST: Software to model effect of boom on elements for UH F yagis?

By mistake I sent this message to Ian Roberts only, but it was supposed to
end up here

>This can be modelled with NEC2 - construct the boom, then attach the
>elements to the boom. NEC2 assumes that when the coordinates coincide/nearly
>coincide, they are in physical contact. The documentation mentions this.

... not quite so according to my observations using nec2d750. I was so
afraid not to cross the wires in situations where they passed in a close
proximity, and made a big fuss about it until I found (by chance) that
unless nodes are near - nothing happens. I wanted to model a wire mesh, and
made a mistake in segmentation. Mesh simply did not work. Then I checked
currents, and voila - wires are not connected unless nodes are very near,
and they were not as one had even and the other had odd number of them.
Whole new area of extremely simplified solutions came up. I tried modeling
various Streba constructions, and they worked as a dream - wires crossed,
of course.
The other stupid feature of nec2d is that nodes connections work fine only
if coordinates are rounded to exactly 2 decimal places. I have no
explanation of this, but it is the only way to make a construction work
when rotated.

I have a serious question for this group:
        Is it humanly possible to get hold of NEC4 for someone in Croatia simply
for academical purposes?

Davor Virkes
Croatian Telecom inc.
Zagreb, Croatia

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