Roy Lewallen wrote:
Can I conclude from this that if I were to make a coil with more or less
inductance, then I would see a current difference between the ends of
the coil?

So tell you what. If you'll pull out your equations and calculate the
expected current difference, I'll replace the coil with one of 100 ohms
reactance and remeasure. How much current difference (magnitude andd
phase, of course) between the ends of a 100 ohm inductor at the base of
that same antenna?

I know you are not that naive, Roy. I have said many times over the past
few days that if you locate a coil at a current maximum point, the current
will be approximately equal at each end. So what did you do? You locate
your coil at a current maximum point and I assume your measurements proved
me to be correct. As long as you install the coil at the base of the
antenna, the currents are guaranteed to be close to equal as I have
said any number of times.

If you place the coil at a location where the slope of the current is
maximum and positive, the current through the coil will *INCREASE*.

If you place the coil at a location where the slope of the current is
maximum and negative, the current through the coil will decrease. This
is typical of center-loaded mobile HF antennas.

Incidentally, Kraus engages in some of your alleged "pseudo-analysis"
in his book. He clearly shows the current drop through loading coils.
He even says a coil can be used to shift the current by 180 degrees.
Come to think of it, my 440 MHz mobile antenna has a coil in the center
that shifts the current by 180 degrees yielding considerable gain
from those two phased elements.
--
73, Cecil http://www.qsl.net/w5dxp



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