3 Feb
2017
3 Feb
'17
11:51 a.m.
On Feb 3, 2017, at 2:43 PM, Tony Duell <ard.p850ug1
at gmail.com> wrote:
On Fri, Feb 3, 2017 at 7:35 PM, Mouse <mouse at rodents-montreal.org> wrote:
It's not really the skin effect that matters here. It's the dielectric
medium that surrounds the conductors that effectively slows the
fields down.
Yes. Consider open wire transmission line, which has a velocity factor around 98%. Or
air dielectric coax, similarly high value. The smaller numbers. like 66%, are found in
traditional solid-dielectric (not foam) coax cable.
paul
> 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.