> Impedance refers to both R and X, resistance and reactance. Impedance
affects all current flow, DC and AC. X affects AC only.
Impedance is specific to AC. There's no such thing as impedance at DC, only
resistance. Look up in the definition of impedance in any engineering text
and you'll find that it only applies to AC.
A cable's characteristic impedance is determined by the ratio of E to I when
there are no reflections on the line. Reflections can only exist when the
current being carried is varying, i.e. an AC waveform.
A coaxial cable that has a 75 ohm characteristic impedance will conduct
steady-state DC at any E to I ratio, and will do so without reflection. The
cable does not perform any transformation regardless of the load, unlike the
AC case.
> No a coax will not function the same at 5 Hz as it does at 2 meters.
Why not?
> Evidently you have not had the previledge of working with
> equipment or engineers that allows one to look at some of
> these issues.
Oh, I think have...
--- Jeff
