Jim Kelley wrote:
That's true only if you assume the desired feedpoint impedance must be
the lowest possible value. And I think, as you have pointed out on more
than one occasion, the current maximum is not usually located at the
feedpoint, where it would otherwise be if the current minimum is located
90 degrees away.

The standing-wave current envelope on an ideal
transmission line is sinusoidal and the "current
maximum" is the current anti-node in the sinusoidal
envelope at which point the voltage is in phase
with the current. A loading coil is not an ideal
transmission line and its "current maximum" is not
caused by standing waves. The "current maximum" in
the coil is caused by adjacent coupling between the
coils and does not occur at a purely resistive point.

The current envelope at:

http://www.k6mhe.com/n7ws/LoadedAnte...s/image003.gif

Is clearly not sinusoidal. Although not shown, the
voltage at the current maximum in the coil is not
in phase with the current so in this case, the
"current maximum" is not a pure resistance, is
not the current anti-node point, and is not the
resonant point. The current at the bottom of the
antenna is in phase with the voltage and the feedpoint
impedance is purely resistive.

The coil puts a hump in the current which causes
the current envelope to deviate from sinusoidal.
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:

A loading coil is not an ideal
transmission line and its "current maximum" is not
caused by standing waves.

It's probably true that ideal transmission lines don't exist in any
form. The standing wave in question has both a minimum AND a maximum,
whose locations are determined by the relative phase and amplitude of
the forward and reflected waves at each position.

The "current maximum" in
the coil is caused by adjacent coupling between the
coils and does not occur at a purely resistive point.

How do you propose that this occurs without having an effect on the
forward and reflected waves which comprise the standing wave?

Although not shown, the
voltage at the current maximum in the coil is not
in phase with the current so in this case, the
"current maximum" is not a pure resistance, is
not the current anti-node point, and is not the
resonant point. The current at the bottom of the
antenna is in phase with the voltage and the feedpoint
impedance is purely resistive.

It would be better if you provided some sort of demarcation between
the well known facts and the pensive speculation in your posts. :-)

The coil puts a hump in the current which causes
the current envelope to deviate from sinusoidal.

What does the IEEE dictionary have to say about 'current humps' I wonder.

73, ac6xg

Jim Kelley wrote:
How do you propose that this occurs without having an effect on the
forward and reflected waves which comprise the standing wave?

It obviously has an effect on the standing wave. In no
way can Wes's current waveform be called a cosine function.
However, we know that the current and voltage are in
phase at the feedpoint and at the tip of the antenna.
It is impossible for them to be in phase anywhere else.

It would be better if you provided some sort of demarcation between the
well known facts and the pensive speculation in your posts. :-)

It's all simple physics, Jim, aided by a measured IQ of 168.
--
73, Cecil http://www.w5dxp.com

On 6 Dec, 13:50, Cecil Moore wrote:
Jim Kelley wrote:
How do you propose that this occurs without having an effect on the
forward and reflected waves which comprise the standing wave?

It obviously has an effect on the standing wave. In no
way can Wes's current waveform be called a cosine function.
However, we know that the current and voltage are in
phase at the feedpoint and at the tip of the antenna.
It is impossible for them to be in phase anywhere else.

It would be better if you provided some sort of demarcation between the
well known facts and the pensive speculation in your posts. :-)

It's all simple physics, Jim, aided by a measured IQ of 168.
--
73, Cecil http://www.w5dxp.com

Ouch Cecil, I think you need to come down a bit!
We are not prehistoric mammals when compared to what you
perceive your self to be. Do you really want to be a clone of Roy
where you can flout yourself as superior to all?
You have had your fun with all those wave things that
you have foisted upon others but rubbing it in regarding
how clever you are compared to other mortals will not
allow anger that has festered to decline.
Art

art wrote:
Ouch Cecil, I think you need to come down a bit!

My nephew, who is also a member of MENSA, recently
went to a job interview. On his resume, he listed
his MENSA membership. The interviewer, who would
have been his future boss said, "You're a member
of MENSA? You want my job, don't you?" My nephew
took the MENSA line off his resume. :-)
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:

My nephew, who is also a member of MENSA, recently
went to a job interview. On his resume, he listed
his MENSA membership. The interviewer, who would
have been his future boss said, "You're a member
of MENSA? You want my job, don't you?" My nephew
took the MENSA line off his resume. :-)

Let him know that Star Trek Fan Club membership isn't something to
brag about either. :-)

ac6xg

Cecil Moore wrote:

...
My nephew, who is also a member of MENSA, recently
went to a job interview. On his resume, he listed
his MENSA membership. The interviewer, who would
have been his future boss said, "You're a member
of MENSA? You want my job, don't you?" My nephew
took the MENSA line off his resume. :-)

Yes, I have seen it time and time again ... people are fired for
proficiency, IQ, skills, warm personalities, etc. I have seen gifted
individuals sabotaged, setup, conspired against, etc. Has made me very
slow to react on job performance evaluations given by others on an
individual(s.)

The idiots of the world have a mission and a lot at stake, they will
"kill" competition on sight! This is used as a strong "survival skill"
by them ... convince the nephew that there is a lot to be had by
"dummying up" at the correct times and places.

Sometimes you wonder if this is not the major force at work in large
corporations?

Regards,
JS

Cecil Moore wrote:
art wrote:
Ouch Cecil, I think you need to come down a bit!

My nephew, who is also a member of MENSA, recently
went to a job interview. On his resume, he listed
his MENSA membership. The interviewer, who would
have been his future boss said, "You're a member
of MENSA? You want my job, don't you?" My nephew
took the MENSA line off his resume. :-)

I'd be interested in hearing why people bother to join MENSA and why
they'd attend meetings. Where's the fulfillment in standing around in a
room full of folks congratulating each other on how smart they are?

It isn't the numbers in your IQ which are important, Cecil, it is what
you do with 'em.

Dave K8MN

Dave Heil wrote:

...
I'd be interested in hearing why people bother to join MENSA and why
they'd attend meetings. ...
Dave K8MN


Because they are interested in what is said, rather than who said
it--something which you will NEVER understand--give up now ...

JS

Dave Heil wrote:
Where's the fulfillment in standing around in a
room full of folks congratulating each other on how smart they are?

It gets the females turned on.
--
73, Cecil http://www.w5dxp.com