On Oct 24, 8:44*pm, Andy Champ wrote:
On 23/10/2010 15:48, Tabby wrote:



Would a 20kHz soundcard scope be enough?

The capacitance meter approach is real simple.

NT

Ooh let's see... speed of transmission in copper is roughly half that of
light. *But the signal needs to go out and back, so the transit time is
that of a signal going one way at a quarter that of light.

so 20kHz will give you a resolution pushing 4km.

Feel free to point out the error in my calculations!

Andy


Well, the L & C of the cable should slow it down, but even so I can't
see a 20kHz scope being usable.


NT