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Old October 28th 04, 08:32 AM
Cecil Moore
 
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Roy Lewallen wrote:

Cecil Moore wrote:
Well, I have already posted the equations. . .


Well, no you haven't. Why do you keep saying that?


Because it's true. Here are the equations again.

A loading coil exists in a standing-wave antenna.
The forward current through the loading coil is I+.
The reflected current through the loading coil is I-.
The net current at any point in the coil is I+ + I- (phasor addition)
The magnitude of the net current depends upon the phase of I+ and I-.

Itot = I+ + I-

There's the equation that I have already posted many, many times.
Sorry you missed it.

A rough estimate of the net current at the top of a loading coil
can be had by estimating the number of degrees occupied by the
coil and assuming a net current cosine function through the coil.
--
73, Cecil http://www.qsl.net/w5dxp


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Old October 28th 04, 10:03 AM
Roy Lewallen
 
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Roy Lewallen wrote:

Cecil,

In a simple monopole with one inductor, let L1 be the distance from
the base of an antenna to the bottom of the loading coil in meters,
L2 the length of the loading coil, L3 the distance from the top of the
loading coil to the top of the antenna. I is the base current, L the
inductance value and F the frequency. You can assume the antenna is
very thin.

Since your theory is so elegant and well developed, and you've had
such an excellent education at Texas A&M, it shouldn't be difficult at
all for you to write a couple of simple equations which give the
currents at the two ends of the coil. In the time-honored methods of
science, your equations can then be tested against modeled and
measured results to prove the validity of your theory.

Roy Lewallen, W7EL


Cecil Moore wrote:


Well, I have already posted the equations. . .


. . . Here are the equations again.

A loading coil exists in a standing-wave antenna.
The forward current through the loading coil is I+.
The reflected current through the loading coil is I-.
The net current at any point in the coil is I+ + I- (phasor addition)
The magnitude of the net current depends upon the phase of I+ and I-.

Itot = I+ + I-

There's the equation that I have already posted many, many times.
Sorry you missed it.
. . .


Helloo. . . Anybody home?

Roy Lewallen, W7EL
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Old October 28th 04, 05:56 PM
Cecil Moore
 
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Roy Lewallen wrote in message ...
Roy Lewallen wrote:
it shouldn't be difficult at
all for you to write a couple of simple equations which give the
currents at the two ends of the coil.

Itot = I+ + I-

There's the equation that I have already posted many, many times.
Sorry you missed it.


Helloo. . . Anybody home?


Roy, you asked for a couple of simple equations which give the currents
at the two ends of the coil. Here they are again:

Itot(bottom) = I+(bottom) + I-(bottom)

Itot(top) = I+(top) + I-(top)

Exactly what equations do you use when you make your assertions about the
current at each end of a coil? Please be specific.
--
73, Cecil, W5DXP
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