UNIBUS extension card/cable sets

Paul Koning paulkoning at comcast.net
Fri Jun 26 15:24:38 CDT 2015

> On Jun 26, 2015, at 3:58 PM, John Wallace <johnwallace4 at yahoo.co.uk> wrote:
> [huge snippage for brevity, apologies for rubbish formatting]
> I'm not 100% sure I'm right in what follows (it's been a long time) but improvements are welcome. It builds on much of what has already been said.
> Termination has been covered by various contributors - termination reduces (but may not completely eliminate) reflections.

More precisely: terminating a transmission line in its characteristic impedance eliminates the reflection.  Terminating it with something that differs from the characteristic impedance will produce a reflection whose magnitude and phase depends on the mismatch.  Open and short are extreme examples of mismatches, but any mismatch will produce a reflection.  


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