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July 25th 03, 12:09 PM

oSaddam (Yuri Blanarovich) wrote in message ...

Things I would like to see is incorporation of terrain simulation with antenna
design. Few zones of different "ground quality" (radials, sand, salt water)
with linear and/or circular boundaries plus sloping terrain (contour profile).
Example would be four square array on the sloping hill of sand some distance
from the ocean. Verticals are very sensitive to the ground quality and terrain
slopes/profile and this feature would be a great tool in quest for maximizing
the performance of array by using the terrain features (enhanced F/B).
K6STI has Terrain Analyzer (?) I have never tried it, but I understand that he
uses free space pattern of antenna and then applies the geometry and quality of ground.

(Somehow, yesterday I managed to let my reply(s) disappear completely,
so let's give it a second try....)

***

Yuri, what a strange coincedence. This because I exactly had the same
thoughts.

I must admit however that I am not such a (theoretical) antenne
expert, so I think it's a bit too much effort to create the equations
for terrain analysis myself. That's why I already took a look at both
the K6STI program and Dean Straw's latest HFTA program, (both created
to do terrain analysis) and to investigate how much effort it would
take to interface with one of them.
When looking at these programs I realized however that both of them
are limited to horizontal polarized ((stacks of) Yagi) antennas.

4nec2 on the other hand was created to model/optimize any kind of
antenna- structure. (because of my main interes in the lower HF bands
and because there was already enough Yagi specific freeware available)
Furthermore the user interfaces for both programs are a bit difficult
to programatically interface with, so I am afraid this 'project' will
have to wait a while till the long winter evenings...

Enough challenge?

Yes, that's just what I was looking for.

Arie.