JB> as you say I seen no reason why it wouldn't work with a single
JB> terminator but I feel it'd need to be a 25 ohm resistor. 22
JB> ohms would probably be close enough... Hmm I'll have to score
JB> some T connectors and liberate one of my BNC cables from the
JB> video lash-up and try it myself.

JB> This week I happened by a garrage sale and grabbed a BNC cable
JB> (approx 10m) some Tees and terminators, I tried it - nothing
JB> like real-world experience. With a terminator at each end it
JB> works, any other setup including, no terminators, one
JB> terminator at one end and both terminators (and both Tees) at
JB> one end doesn't work. 

 I can't argue with a measurement, but I don't understand.

 There must be something about the pulse timing (or amplitude) that
is *very* critical. 10-metres is a quarter-wave for 120MHz, even
higher in thin coax, and a 10MHz pulse is only going to shift 10
degrees or so...

 The pulse will ring, with overshoot in the negative direction...
perhaps it's that.

 Oh, well... I'm wrong. Well done. A measurement is worth a hundred 
opinions. Now all you have to do is explain why...

Regards,
Bob
 

--- BQWK Alpha 0.5