Alex Holden wrote:
> ???? Capacitance in a coil? The basic ingredients of a capacitor are two
> conductors seperated by an insulator ---||---
> A coil of wire on the other hand is just one long conductor. It may have
> a lot of inductance, but I can't see it having much capacitance (or are
> you talking about a two cored cable? Even then there would only be a
> small amount between the cores).
>
When the wire is coiled you have capacitance between the layers, as well
as all of the other goodies found in "real world" transmission lines:
resistance, parasitic inductance, and parasitic capacitance.  I'd draw
it, but my ASCII-art inductors look like resistors :-)

In my work, we have to deal with transitting over a sheilded coil of
3/16" wire 8000 metres long - lots of inductance, resitance, and yes -
capacitance.

--Matt