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Old February 1st 06, 04:25 PM posted to rec.radio.amateur.antenna
Frank
 
Posts: n/a
Default editing 'helix' construct with 4nec2 graphical editor

Hi Dan, hopefully Arie is following this thread, and he may have the
contacts to resolve these questions. I have not done anything with the
editor concerning wires. Your comments make me think I should take a look
at it.

What do you mean by power calculations? The only power info I am aware of
is the total radiated power. This power is a little misleading in that it
does not consider ground absorbtion, and is only valid above a perfectly
conducting ground. The e-field Vs angle info is accurate for all
conditions. The true radiated power can be obtained by summing these data
over a hemispherical region.

Hope you get some correlation on the loaded dipoles when compared with the
8405 measurements.

Frank


"dansawyeror" wrote in message
...
Thanks. That was wondering if that was the case. Every once in a while the
editor converts all my segments into wires. All of a sudden the card file
will jump from a few cards with segments to dozens of cards with one
segment. This is what the helix command does. It could be the same root
cause??

Generally the editor is really easy to use for wires. Have you used the
select group and Control M features yet? They make changing a group of
wires straight forward.

I wonder about the accuracy of the power calculations. They seem too high.

I am experimenting with modeling loaded dipoles versus folded dipoles,
extended W's or M's.

Thanks - Dan

Frank wrote:
Looks to me like there is a bug in the geometry editor "Create Helix"
command, as I have also noticed the same problem. I sure makes for some
really messy looking code. The helix also appears with the axis normal
to the edit page. Have not figured out how to rotate it yet. Whoever
wrote this interface program did a great job, but seems a heck of a lot
easier just to work at the card level.

Frank


"dansawyeror" wrote in message
...

All,

Has anyone figured out how to edit a 'helix' object in 4nec2? Creating a
helix works, however it creates a line entry per segment. Is there a way
to create a helix with the graphical editor that has multiple segments
per card entry?

Thanks - Dan