Thread: Vincent antenna
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Old December 18th 07, 12:42 AM posted to rec.radio.amateur.antenna
Cecil Moore[_2_] Cecil Moore[_2_] is offline
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First recorded activity by RadioBanter: Mar 2007
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Default Loading Coils; was : Vincent antenna

Roy Lewallen wrote:
Jim Kelley wrote:

Cecil Moore wrote:
. . The phase is referenced to the source phase, as it is in EZNEC,
but you already knew that and just want to perform your usual
diversions away from the technical facts.


The current reported by EZNEC isn't referenced to source phase. The
phases of all currents and voltages -- wire, source, and load -- are all
referenced to the same arbitrary point. Source phase can be assigned by
the user to any value relative to this point.


The phase assigned by the user to the source obviously becomes
the default reference phase. What on earth do you have to gain
by obscuring that technical fact?

If the user doesn't do anything, the source phase defaults to zero
and all current measurements are referenced to that zero source
phase. Are you so determined to discredit me that you are willing
to sacrifice your integrity in the process?

Do you deny that there is virtually no phase shift in the current
up and down a 1/2WL dipole referenced to the source current. If you
are up to that denial, please argue with Kraus's graphic. Take a look
at the phase angles at:

http://www.w5dxp.com/krausdip.jpg

Unfortunately, Kraus agrees with EZNEC and that current is
exactly what you used to make your meaningless measurements
of current phase through a loading coil. So please look at
Kraus's graph and tell us again how that current with unchanging
phase can be used to measure phase shift through a loading coil.

As far as I can tell, Cecil has never been quite able to understand just
what EZNEC reports. EZNEC doesn't need several different definitions of
current to suit the theory du jour or to do its job, so it doesn't
report "standing wave current" or other fruits of The Gifted One's
overly fertile imagination. It simply reports current.


My point exactly! If the antenna being modeled is a standing-wave
antenna, EZNEC reports standing-wave current.

If the antenna being modeled is a traveling-wave antenna, EZNEC
reports traveling-wave current. Roy apparently doesn't want anyone
to know this fact.

So Roy, why would the phase shift through a coil be different
when it is used in a 1/2WL dipole vs using it in a rhombic
at the same frequency??? Magic???

Roy has threatened to take EZNEC away from me for using it to
demonstrate traveling-wave current through a loading coil. Here
is what EZNEC says about the delay through that loading coil.

http://www.w5dxp.com/coil512.ez

Click on "Load Dat" and observe what Roy is so afraid that
someone besides me is going to discover.
--
73, Cecil http://www.w5dxp.com