Keith Dysert wrote:
"(How well would a TDR worh, if any substantial amount of return was
reflected?)"

A properly terminated line does not make reflections. I would imagine
multiple reflections on an oscilloscope produce the same smear as as
they do on TV.

TDR is suggested for monitoring bridge integrity and performance. Where
was it when we needed it? TDRs are likely cheaper than replacing all the
questionable bridges.

TDR is used to determine the characteristics of electrical lines by
observing reflected waveforms.Tektronnix is a leader with its "I
Connect" software. Roy can likely describe it. Agilent suggests TDR is
the most general approach to evaluating the time domain response of any
electromagnetic system is to solve Maxwell`s equations in the time
domain. The foregoing is courtesy of Wikipedia. The incoherent structure
of the last sentence was theirs too.

Best regards, Richard Harrison, KB5WZI