"tom" wrote
. net...
Richard Clark wrote:

Hi Mike,

Careful, he might mis-interpret "straight." For him, this forum is
about sex, politics, or religion - but not science, engineering, and
certainly not antennas.

73's
Richard Clark, KB7QHC

Richard,

You forgot metaphysics.

Like EM. Look at this:

See:
http://www.electronics.radiouk.com/e...na/reflect.php

"Standing wave.
When energy is reflected back towards the source, the combination of the
forward and reflected signals create a third wave. The picture on the right
is a rough demonstration of the creation of a standing wave.
The forward signal (black) combines with the reflected (blue) to create the
standing wave (green) which, although stood still, is continually varying in
amplitude."

It means that at the end of an antenna the voltage is doubled (the same take
place in a capacitor).

Now see at this: http://en.wikipedia.org/wiki/Kundt's_tube
"The sound generator is turned on and the piston is adjusted until the sound
from the tube suddenly gets much louder. This indicates that the tube is at
resonance, which means its length is a multiple of the wavelength of the
sound wave. At this point the sound waves in the tube are in the form of
standing waves, and the amplitude of vibrations of air are zero at equally
spaced intervals along the tube, called the nodes."

Between the nodes are places where the amplitude is doubled.

Derive the voltage doubling from EM.
S*