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Re: TDR probe modifications, semantics and a modest proposal

To: sowacs@aqua.ccwr.ac.za
Subject: Re: TDR probe modifications, semantics and a modest proposal
From: Romain Gagnon <RGagnon@smartrain.com>
Date: Thu, 07 Nov 1996 18:08:45 -0500
Cc: dbarnett@ecs.umass.edu
Sender: owner-sowacs@aqua.ccwr.ac.za

I wander why would you terminate your strip line with a 50 ohms resistance.
TDR works as long as there is reflection.  If your termination matches the
line impedance, you will not get any reflection.  

If you want to make a TDR probe more rugged, you can short circuit it at the
end.  You will then get as much reflection as if it was open but the signal
will be inverted.  Obviously, the circuit must be able to deal with this
inversion and I don't know if Campbell's does.

Romain Gagnon Eng


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