On Mon, 1 Jun 2009 20:25:06 +0200, Szczepan Bia³ek
wrote:


That are speculations only. Everybody know that at the end of an antenna the
high voltage appears.

Even for a controlled current distribution dipole?

"Registered User" wrote
...
On Mon, 1 Jun 2009 20:25:06 +0200, Szczepan Bia³ek
wrote:


That are speculations only. Everybody know that at the end of an antenna
the
high voltage appears.

Even for a controlled current distribution dipole?

All time I am writing about the original Hertz apparatus. See:
(http://people.seas.harvard.edu/~jone...Hertz_exp.html

There the ends of the dipole are named "capacitor plates". In the center of
the dipole the sparks jump. The question is which part of the Hertz
apparatus radiate? The capacitor plates (voltage pulses) or the sparks (AC
current).

AC current create the transverse waves. The capacitor plates (or balls)
longitudinal waves.
What are the radio waves: transversal or longitudinal?
S*

Szczepan Bia³ek wrote:
AC current create the transverse waves. The capacitor plates (or balls)
longitudinal waves.
What are the radio waves: transversal or longitudinal?

The radial currents on the capacitor plates are 180
degrees out of phase. A lot of the radiation from the
plates simply cancels.

Ramo and Whinnery say that radiation is "primarily
TEM", i.e. TEM is the "principle mode".
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com

"Cecil Moore" wrote
...
Szczepan Bia³ek wrote:
AC current create the transverse waves. The capacitor plates (or balls)
longitudinal waves.
What are the radio waves: transversal or longitudinal?

The radial currents on the capacitor plates are 180
degrees out of phase. A lot of the radiation from the
plates simply cancels.

Electrical dipole radiation is known from Gauss time.
For us the two plates (or balls - Hertz used them also) are the two sources
of electric longitudinal waves.
For this reason in 1933 the frequency doubling was observed.

Ramo and Whinnery say that radiation is "primarily
TEM", i.e. TEM is the "principle mode".

It is easy to say. Tell me if you have ever seen the emitting antenna which
has the "current zone" exposed and the ends covered?
According to Maxwell the tranversal waves MUST be created by AC current. DC
current create the magnetic whirl. AC current create oscillating whirl. Such
oscillating whirl starts the transverse wave. But this Maxwell proposition
is not verified to now.
S*