Hmm, intended to send this to the list, sent to John Hasler, only, who did respond -- I hope he will copy his reply to the ist (or tell me it is ok to do so).
On Monday, December 24, 2018 08:21:57 AM John Hasler wrote: > As to TDRs, if you can get by without actually seeing pictures of all > the impedence bumps > you can get by with a fast counter, a high risetime > pulse generator, and a couple of fast comparators. Maybe $20 at > Digikey. Can you elaborate a little on how that would work?