Re: Can twisted wire replace shielded wire?
- From: Clhuprich@xxxxxxxxxxxxxxxxxxxxxxxxxxx (Cliff)
- Date: 29 Nov 2005 13:04:55 GMT
On Mon, 28 Nov 2005 14:51:55 -0600, John Fields
<jfields@xxxxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, 28 Nov 2005 13:32:27 -0500, Cliff <Clhuprich@xxxxxxx>
wrote:
>
> On Mon, 28 Nov 2005 00:56:50 GMT, David <rickets@xxxxxxxx>
wrote:
>
> Characteristic impedance is purely a function of the
> capacitance and inductance distributed along the line's length, and
> would exist even if the dielectric were perfect (infinite parallel
> resistance) and the wires superconducting (zero series resistance).
> Velocity factor is a fractional value relating a transmission line's
> propagation speed to the speed of light in a vacuum. Values range
> between 0.66 and 0.80 for typical two-wire lines and coaxial cables.
> For any cable type, it is equal to the reciprocal (1/x) of the
square
> root of the relative permittivity of the cable's insulation.''
>
> How odd then that the speed of propagation in conductors
> varies.
>
> Not at all. Since resistivity varies between conductors because of
> the materials of which they're composed and inductance varies
> because of their diameters, why would one _not_ expect c to vary?
>
You think that resistivity controls the speed of light?
I think I heard that a good vacuum has a lot of resistance
but a fairly high speed of light.
The speed of light goes down as things become more
conductive?
--
Cliff
.
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