On 02/03/2017 01:35 PM, Mouse wrote:
the propagation delay as the signal gets to each pin (remember a
foot is about a nanosecond.  [...])
Not really.  A foot is about a light-nanosecond, yes, but
high-frequency signals in copper travel by skin effect, moving
significantly more slowly - somewhere around .6c, I think it is.

Well, actually, it depends on the impedance. So, 50 Ohm coax cable is .6 C, twisted pair differential cable is 120 Ohms, and the propagation velocity is a little above .7 I think. Wires in open space are faster, around .8 or so, but the signal quality may be poor.

Jon

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