[ot] use of a long coaxial cable

[Man-wai CHANG]

> You *cannot* measure impedance with an Ohm meter.  You need some special
> equipment.  In lab, we did it with a frequency generator and and
> oscilloscope.  VERY simply, Ohms work for DC and impedance is for
> everything else.  Impedance is a function of frequency. [R(f)]

I suspect impedance has something to do with speed of electrons flow and
distance. It's not pure resistance.

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