Cecil wrote,

Thanks to Wes, n7ws, I found out how easy it is to model a helical coil
with EZNEC. The following three antennas were modeled using the same
coil, 4.5 turns, 12 inch diameter, 10.8 inches long, using approximately
14 feet of wire. The antennas are similar. The frequencies are different
to illustrate three different arguments. EZNEC zero-impedance loads were
placed directly below and directly above the coil to ascertain the currents.
The accompanying .ez files can be downloaded and run on EZNEC if desired.


It certainly is interesting how a person who, only a short time ago was railing

against "the math model," suddenly gets religion when he thinks it agrees with
him. EZNEC not only uses math to reach its conclusions, that's *all* it uses,
plus
a few assumptions about how current is distributed over antenna segments.
Glad you've joined the fold, brother Moore.
73,
Tom Donaly, KA6RUH

Tdonaly wrote:
Cecil wrote,

Thanks to Wes, n7ws, I found out how easy it is to model a helical coil
with EZNEC. The following three antennas were modeled using the same
coil, 4.5 turns, 12 inch diameter, 10.8 inches long, using approximately
14 feet of wire. The antennas are similar. The frequencies are different
to illustrate three different arguments. EZNEC zero-impedance loads were
placed directly below and directly above the coil to ascertain the currents.
The accompanying .ez files can be downloaded and run on EZNEC if desired.

It certainly is interesting how a person who, only a short time ago was railing
against "the math model," suddenly gets religion when he thinks it agrees with
him.

It is certainly interesting that you choose to mount an ad hominem attack
instead of providing an iota of technical content.

I do not rail against all math models, just the ones that don't match
reality. I require my math models to give the correct answer. Others
obviously have lower standards for math models than I do.

One rock plus one rock equals two rocks is a math model with which I
fully agree. Coils with zero capacitance is a math model with which
I disagree.

Now please tell us why lumped inductive reactances don't agree with
wire segment coils, stubs, or reality.
--
73, Cecil http://www.qsl.net/w5dxp



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On Fri, 06 Feb 2004 06:12:43 -0600, Cecil Moore
wrote:
Now please tell us why lumped inductive reactances don't agree with
wire segment coils, stubs, or reality.
Operator error.

It's like trying to measure Ohms without turning on the meter's
current source. There's a lot of institutionalized ignorance in these
threads.

Richard Clark wrote:

wrote:

Now please tell us why lumped inductive reactances don't agree with
wire segment coils, stubs, or reality.

Operator error.

Yep, the error is in the operator's choice of a model
that doesn't match reality.
--
73, Cecil, W5DXP

On Fri, 06 Feb 2004 13:32:40 -0600, Cecil Moore
wrote:
Yep, the error is in the operator's choice of a model
that doesn't match reality.
Institutionalized here for the sake of argument.

Cecil wrote,
(snip)

I do not rail against all math models, just the ones that don't match
reality. I require my math models to give the correct answer.

(snip)

That's code. It means "I do not rail against all math models, just the
ones that don't agree with me. I require my math models to give the
answer I've already made up in my head."
73,
Tom Donaly, KA6RUH

Tdonaly wrote:
That's code. It means "I do not rail against all math models, just the
ones that don't agree with me. I require my math models to give the
answer I've already made up in my head."

No, I require a math model of a coil that agrees with Roy's and
Tom's measurements. A lumped inductive reactance doesn't do
that. My math models are dictated by reality. Therefore, I
live in the real world and you live in a world created and
dictated by your math models. I prefer my world. You obviously
prefer yours.
--
73, Cecil http://www.qsl.net/w5dxp



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