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Old October 20th 04, 06:03 PM
 
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Yuri
I was relying on statements from Roy in the past where close spaced wires
causes errors.
In a inductance coil each wire is in close proximetry to other wires in the
coil that undergo
voltage changes Thus by his statements his limited number of segments
available could cause errors.
It was for this reason my modelling picture was the image of a real coil
with close spaced
coils und unlimited segments available which when increased did not change
the supplied.results,
the test for finality in modeling.
One of the reasons I chose this aproach was when modeling critically coupled
coils, lumped loads
which are imaginary and dimensionless gave problems with critically coupled
distances from the
center line of a coil ie inside the coil, to distances to outside the coil
in a single plane, as well as the
capacitive coupling provided by the length and shape of the coil
To me it was important for the program to do it's job with a real life
coil without any intrusions
and assumptions imposed by the operator. If a program has limitations
imposed then it is a sign
that human overuling intervention is required to prevent the program from
running amuck.
But as I stated earlier, I have no intention of getting involved in this
thread with its infighting
when I respect some people from both camps.and where as previously stated by
a poster
some responses are posed like a language but are non decipherable
Art

"Yuri Blanarovich" wrote in message
...
Like most technical things there is nothing wrong with the use of items
such as EZNEC
within the limits prescribed by Roy and the coil question is outside the
useable limits
of the EZNEC program.


Art,
in EZNEC version 4.08 by using HELIX definition menu in WIRES you can

define
real coil, with segments. I did that at the beginning of this thread using

10m
quarter wave loaded antenna showing the difference in the current at the

coil
ends and also what happens when you move the coil from 1/2 to 3/4 way up

from
the feed point. That correlates close to modeling of loading inductance by
using stub and what was found by measurements in reality.
If one insists in modeling loading coil as inductance with zero physical

size,
then you get W8JI results (same current at the ends)
There is a progress, even if some still can't swallow it.

73 Yuri, K3BU.us