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Old March 17th 06, 04:21 AM posted to rec.radio.amateur.antenna
Reg Edwards
 
Posts: n/a
Default Coils are transmission lines

I don't understand what you are trying to say. Express yourself, less
ambiguously, in fewer words.

Or perhaps you are nit-picking. I can't tell.

I have just explained that the resulting capacitance between adjacent
conductors in a coil is very small in comparison with the capacitance
of a large solid cylinder (of the same diameter as the coil) to the
rest of the world.

The capacitance to the rest of the world includes electric lines of
force from one half of the cylinder to the other, especially from one
end to the other. The capacitance of the coil we are dealing with has
very little to do with coil turns.
----
Reg.


"John Popelish" wrote in message
...
Roy Lewallen wrote:
Of course I understand that both L and C are distributed. But the

C in
the transmission line formula isn't a longitudinal C like the C

across
an inductor; it's the (distributed, of course) shunt C between the

two
conductors of the transmission line. I don't believe you can

justify
claiming that the C across an inductor is even an approximation

for the
C from the inductor to whatever you consider to be the other
transmission line conductor.


Agreed. They are as different as a shunt element and a series

element
in a pi filter.