Cecil Moore wrote:
Roy Lewallen wrote:
. . .
So in the past, you've predicted no difference, something like 20 or
45 degrees phase shift, or an indeterminate amount. It's good to see
you've settled on one figure.


There are three possibilities listed earlier. What happens with a coil
depends upon where it is located. Please read that over and over until
it soaks in.

That's the problem. The more times I read what you've posted, the more
confused I've gotten.

My inductor was placed at the antenna base because I could measure the
currents there with reasonable accuracy.


Yep, you are looking for your keys under the streetlight because the light
is better there than it is where you really lost the keys.

You have a unique talent for turning an honest effort at being truthful
and accurate into an insult, as you did with Ian.

On his web site, Yuri quoted W9UCW as measuring the currents at the
ends of a toroid mounted at the base of the antenna as being 100 mA at
the bottom and 79 at the top. You must, then, believe these
measurements to be in error.


If the toroid is not mounted at a current maximum point, i.e. if the
feedpoint
impedance is slightly capacitive, then those figures could be accurate. I
didn't pay any attention to them. Could be his coil causes a larger phase
shift than your coil. You making your antenna too long ensured that
the current maximum point would fall inside the coil. Whether you realize
it or not, you are biasing the outcome of your experiment to agree with
your
pre-conceived (sacred cow) notions.

This is precisely why I've given you the opportunity to choose the
inductor for the 10 MHz test. You choose it so that it will best
illustrate what you say is true. Shucks, I even encourage you to do the
experiments yourself.

. . .

Roy Lewallen, W7EL

Roy Lewallen wrote:
That's the problem. The more times I read what you've posted, the more
confused I've gotten.

Use EZNEC to display the current distribution for a 102 ft center-fed
dipole on 20m. Assume the origin is the feedpoint. Turn the current
phase on. You have 270 degrees of a cosine wave for the current to the
right of the feedpoint. You have a current maximum at zero degrees and
180 degrees. The current magnitude decreases to zero in the first 90
degrees. The current magnitude increases to a maximum negative value
in the second 90 degrees. The current magnitude decreases to zero in
the third 90 degrees. Where one locates a loading coil and how many
degrees it replaces will determine the magnitude and phase of the
current into the coil and the current out of the coil. There are
three possibilities.

You have a unique talent for turning an honest effort at being truthful
and accurate into an insult, as you did with Ian.

Roy, honest efforts are not always valid and the truth sometimes hurts.

This is precisely why I've given you the opportunity to choose the
inductor for the 10 MHz test. You choose it so that it will best
illustrate what you say is true. Shucks, I even encourage you to do the
experiments yourself.

I have some 1.5" diameter, 6 tpi stock. Get a one foot stinger and use
enough of that kind of stock to resonate on 10 MHz. I guarantee the
current will be different into and out of the coil.
--
73, Cecil http://www.qsl.net/w5dxp



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