"Cecil Moore" wrote
Reg Edwards wrote:
Has it ever occurred to you guys that a coil is a coil wherever it
is
used and always behaves in the same way.

The coil always behaves in the same way. Unfortunately, the models
used to explain the operation of the coil don't work in the same
way. Please see:

http://www.ttr.com/corum/index.htm
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Cecil, thanks, I speed-read your extensive pointer.

The whole thing could be summarised in one short sentence -

"Coils are distributed transmission lines."

The same general equations apply to coils of all dimensions, for any
number of turns, at all frequencies, in all applications. There's no
need to unnecessarily complicate things by artificially dividing them
into lumped and other varieties.

I had to skip over the bit about Smith Charts. As you are aware I
don't know how to use one.

It seems Tesla, with HIS coils, knew what it was all about and he
couldn't use a Smith Chart either.
----
Reg.