Thanks, Tom.

In fact, let's get back to something very basic about antennas.

Acceleration of CHARGE results in electromagnetic RADIATION.

RADIATION impinging on a receiving antenna (and on anything else that
freely transports charge) causes acceleration of CHARGE within that
antenna.

So when we are talking about antennas, it is very appropriate to be
talking about charge, and exactly what happens to it to move it around
and to accelerate it as a function of time, everywhere in the
structure.

A voltage applied to the feedpoint terminals of an antenna causes
CHARGE to be put into motion. Accumulation of CHARGE along the
conductors--the distribution of charge as a function of time and
space--in turn results in electric fields in the vicinity of the
antenna. Motion of charge results in magnetic fields in the vicinity
of the antenna. Capacitance and inductance are manifestations of the
electric and magnetic fields, respectively. Taken as a whole, the
motion of charge and the resulting electric and magnetic fields give
rise to waves: the waves, too, are manifestations of the electric and
magnetic fields. ALL of these are consistent with each other, and to a
very good approximation agree with the descriptions worked out by
Faraday, Gauss, Maxwell and all many years ago. (We don't need quantum
theory to be talking about performance of an 80 meter mobile antenna!)

Please, let's keep it straight that the motion of charge is FUNDAMENTAL
to all this analysis, and everything else will fall out very nicely
from an accurate accounting of the motion of charge within the system.
It is NOT irrelevant at all; it is at the very heart of the operation
of ALL antenna systems.

Cheers,
Tom

Tom, K7ITM wrote:
"A voltage applied to the feedpoint terminals of an antenna causes
CHARGE to be put in motion. Accumulation of CHARGE along the
conductors--the distribution of charge as a function of time and
space--in turn results in electric fields in the vicinity of the
antenna."

Agreed that current is charge in motion. Accumulation of charge,
however, is a job for an accumulator, another name for a storage
battery. These have little to do with the possibility of an antenna coil
having currents through the coil from opposite directions creating
unequal totals at the ends of the coil.

I don`t know if this Tom is picking a fight to gain attention before
going to Dayton but his postings have the right fragarance.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:

Tom, K7ITM wrote:
"A voltage applied to the feedpoint terminals of an antenna causes
CHARGE to be put in motion. Accumulation of CHARGE along the
conductors--the distribution of charge as a function of time and
space--in turn results in electric fields in the vicinity of the
antenna."

Agreed that current is charge in motion. Accumulation of charge,
however, is a job for an accumulator, another name for a storage
battery. These have little to do with the possibility of an antenna coil
having currents through the coil from opposite directions creating
unequal totals at the ends of the coil.

I don`t know if this Tom is picking a fight to gain attention before
going to Dayton but his postings have the right fragarance.

Best regards, Richard Harrison, KB5WZI


If you don't understand the post, I guess a cheap shot is
better than no shot at all.
73,
Tom Donaly, KA6RUH