Roy,

Thanks, I did and I have tried all the combinations.

I would suspect that 'free space' would show a mis match for 'short radials'. It
does not. Simulations of free space dipoles seem accurate. Am I missing something?

I also tried to simulate several values of real earth. None of them produced
high input impedance values. What ground values represent suburban clay?

Thanks again,
Dan

Roy Lewallen wrote:
dansawyeror wrote:

All,

Thank you for your help to get the basic model in place. It seems to
be working except that ground resistance does not appear to be
modeled. This may be an oversimplification my part in how the source
is defined or connected. It is a simple source connected to the first,
lower, segment. The end of that segment is also connected to a radial
system of 8 quite short radials. I would expect to see the feedpoint
impedance reflect the ground system. However, it seems to reflect the
vertical element only. That value is very close to a theoretical
loaded element over a perfect ground. This ground is a medium ground
so it should have some visible effect.

Is it obvious what am I doing wrong?


It sounds like you're using a MININEC-type ground, which isn't
appropriate for this application. Be sure to read the manual sections
involving ground modeling.

Roy Lewallen, W7EL