Tom Donaly wrote:
For those who really want to
know the truth, go to Tom Rauch's web site and read about loading coils.
(He doesn't use the term "current drop" once."
I'm glad you used "truth" instead of "facts". Tom's truth doesn't
agree with scientific fact. You guys have turned your "truth"
into a religion.
Is there a current drop in a transmission line from the current
maximum (loop) to the current minimum (node) when standing waves
are present?
Is there a current drop from the feedpoint of a helical 1/4WL
antenna to the tip of the antenna?
If a coil occupies 90 degrees of a standing-wave antenna or an
unterminated transmission line with reflections, the current
can be maximum at one end of the coil and zero at the other.
The electrical 3/4WL antenna below consists of 1/4WL of wire,
loading coil, and 1/4WL of wire. The net current at one end
of the coil could be one amp while the net current at the
other end of the coil is zero. If you don't understand that
fact, I feel sorry for you.
coil
Feedpoint---1/4WL wire---x-///////-y---1/4WL wire---
When the above antenna is made resonant, the net current at
'x' is zero while the net current at 'y' is maximum. How do
you explain a coil with zero current at the bottom and one
amp at the top? It happens all the time in distributed
networks.
If a coil occupies 180 degrees of a standing wave antenna or an
unterminated transmission line with reflections, the current
can be zero at both ends and maximum in the middle. Such a
configuration is illustrated in "Antennas for all Applications",
by Kraus and Marhefka on page 824.
--
73, Cecil
http://www.qsl.net/w5dxp
"The current and voltage distributions on open-ended wire antennas are
similar to the standing wave patterns on open-ended transmission lines ...
Standing wave antennas, such as the dipole, can be analyzed as traveling
wave antennas with waves propagating in opposite directions (forward and
backward) and represented by traveling wave currents If and Ib ..."
_Antenna_Theory_, Balanis, Second Edition, Chapter 10, page 488 & 489
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