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Old May 11th 07, 06:16 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Phase Shift through a 75m Texas Bugcatcher Coil

Jim Kelley wrote:
You'll forgive me if I'm not in a mood to be generous. You might
consider adding some ordinates to your phase plots.


Here's the definition of "ordinate":
"The y-coordinate on an (x,y) graph"

I'm not sure what you are asking for. The graphs were
generated by Excel. What exactly are you saying? Do
you want me to add the dots for the data points?

Also, some credit
to Roy for making all of the calculations for you might be appropriate
as well. (You might ask him how he does it.)


How he interfaces to NEC? I'm not sure what you are asking
for. EZNEC is a great piece of software but the calculating
engine is NEC. I doubt that even Roy knows the NEC equations.

We still haven't seen
any of your work. By work I mean calculations, not typing i.e.
assumptions, deductions, inferences, and proclamations. Assuming
there are actual values, it would be good to know, for example, what
calculations were made in order to arrive at the phase angles in the
plots.


I don't know what "work" you are asking for. All I did
was run EZNEC simulations and report the results.

The phase angles are calculated and reported by the NEC
calculating engine. I don't know what equations they use,
but probably the method of moments equations. I believe
Balanis has a chapter on MOM equations.

The only equations you provide are for instantaneous amplitude
as a function of phase angle for a standing wave. Obviously that
isn't suffiencient for obtaining the data in your plots. It's very
poorly done. D+


All the data is directly from EZNEC, Jim. Download coil505.EZ
and run it yourself. It is NEC that is doing the calculations.
The data reported by EZNEC was entered into coil505.xls and
Excel produced the graphs. Your objections seem really
strange and petty.
--
73, Cecil, w5dxp.com
 
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