20 Oct
1998
20 Oct
'98
4:32 a.m.
Signal propagation in cables is less than speed of
light (c) and can be
as low as 75% in some coax style cables.
Coax cables with velocity factors of 0.66 are in wide use. And in
some very specialized areas - especially the world of delay lines -
coaxial cables with velocity factors of less than 0.10 are used.
These cables are extremely expensive and somewhat fragile, as their
center conductor is a coil around a ferrite core,
rather than a plain copper wire.
Tim.