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From: wa@hplabsb.UUCP (Wayne Ashby)
Newsgroups: net.micro
Subject: Re: Orphaned Response - (nf)
Message-ID: <2179@hplabsb.UUCP>
Date: Mon, 19-Mar-84 17:35:21 EST
Article-I.D.: hplabsb.2179
Posted: Mon Mar 19 17:35:21 1984
Date-Received: Wed, 21-Mar-84 01:05:46 EST
References: <94@haddock.UUCP>
Organization: Hewlett Packard Labs, Palo Alto CA
Lines: 15

+
I don't mean to be petty, but the propagation delay time in a typical
wire is likely to be closer to 1.6 to 2.0 ns/ft depending on the type 
of dielectric material (insulation or pc board material) that is in
proximity to the conductive wire.  Only with a bare wire in a vacuum
will the propagation delay be somewhere close to 1 ns/ft.

Also, if you are driving an input device there will always be SOME
load (NOT infinite impedance as was stated) however, I agree that 
it is still advantageous to match the load impedance to the 
transmission line that is driving it, especially when the driving device
has fast rise and fall times and the transmission line is long.

				My two cents,
					Wayne ashby (..!hplabs!ashby)