Jim Brown K9YC wrote:
>What do you mean by "perfect?"
Exactly that. A 100% coverage, perfectly uniform,
perfectly conducting shield which is of course not
possible in the real world.
If that perfect shield has a finite thickness, which
it has to have in the real world, there will be an
external field. Actually, to really, really nit-pick,
unless the cable has an infinite diameter!
As I implied in my earlier post, this field will be
very small, but not quite insignificant for the most
sensitive applications, with an excellent (but real)
cable, and is not related to imperfections in real
world manufacturing processes.
This is incidentally not the effect you described
earlier concerning audio frequencies.
73 Roger
VE3ZI
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