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From: "Harry Dellamano"
Subject: Re: Who thinks this?
Date: Fri, 1 Nov 2002 07:51:47 -0800
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"Chris Carlen" wrote in message
> Harry Dellamano wrote:
> > I say the line looks capacitive if the driving rise time is more than
> > the line's one way prop time. As the rise time increases then the lines
> > inductance comes into play.
> > Just a WAG
> > harry
> Harry, have you ever studied the transmission line "telegrapher's"
> equations?" These hold the answers to all of this. It is quite a
> fascinating journey to wade through the model of the line as
> differential lengths of RLCG, to derive the PDEs, solve them, then
> develop the equations needed to understand what happen's in the AC
> steady state cases, then step reflections, and finally if your nuts
> enough, to arbitrary everything.
> Have you been exposed to this sort of thing through an EM course?
> Good day.
> Christopher R. Carlen
> Suse 7.3 Linux 2.4.10
Chris, you are a much better scholar than I. I have been exposed to an EM
course but did not absorb much. I can look at transmission line waveforms on
a scope and understand most wiggles.
My little 4x statement is the rule of thumb of when a line must be
terminated. Rise times slower than this need no termination nor transmission
line theory. It is an important rule to remember.
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