[ntp:questions] Dual Mixer Time Difference (DMTD) instruments sought

Joseph Gwinn joegwinn at comcast.net
Wed May 7 14:41:24 UTC 2008


I may need a Dual Mixer Time Difference (DMTD) instrument, to measure 
picosecond changes in electrical length in a coax plus amplifier time 
reference signal distribution system with total delays in the hundreds 
of nanoseconds, currently operating at 10 MHz (sinewave), but with 100 
MHz likely at some future date.

What DMTD instruments are commercially available?  A google search was 
not successful - all noise no detectable signal, probably because DMTD 
instruments are not that common, and many people build their own.

Thanks,

Joe Gwinn




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