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Old November 16th 07, 11:29 PM posted to rec.radio.amateur.antenna
art art is offline
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On 16 Nov, 07:06, (Richard Harrison) wrote:
Art wrote:

"I am trying to deduce an alternative to the thinking current can hurdle
a capacitor and retain its time variation."

An early demonstration of electroostatic repulsion was via an instrument
called the electroscope. Put a charge on its plates and it opened like a
book. It proved like charges repelled and that repulsion was
proportional to charge.

From that it can be imagined that if you put a charge on one insulated
plate and like charges on an insulated plate nearby have an avenue of
escape to the outside world, you may have produced a capacitor useful
for ac coupling or bypass. It isn`t a hurdle. It is a device capable of
a displacement current which blocks dc but passes ac. It`s a device
formerly called a condenser, now called a capacitor.

Best regards, Richard Harrison, KB5WZI


I assume you are not trying to be funny and are using the dictates of
Terman to make a point. So I will respond. The antenna am referring to
consists
of a tank circuit where the distributed capacitance is the capacitor
in the circuit.
The capacitor stores energy from the time varying current and then
releases the energy
when the terminals are shorted. This energy is not released with the
same properties
that the capacitor but in a similar way that a battery does when the
terminals are
shorted. Thus the time variant that one sees on the energy release is
not the same
as the time varient possesed when delivered to the capacitor but I
could be in error.
I have most of Termans books so if you can point to a section that
confirms your position
and contradicts mine I would apreciate if you would share that section
with me.
Regards
Art