Hi Wolf,

73, Stefan

Am 26.10.2016 23:46, schrieb Wolfgang Büscher:

Hello Jim,

I wouldn't give up on the Thunderbolt E yet. A double-ovenned 10 MHz sounds intriguing, you should have a very low phase noise which other GPSes (clocked by a cheap 'computer grade' oscillator) cannot achieve. It will be interesting if you use the Thunderbolt to trigger a digital oscilloscope, and measure the PPS signal from the chinese unit at a resolution of a 10 ns or so.

With a simple pulse-shaping network (CMOS 4093 wired as a crude 10 us monoflop), the pulse digitized with an E-MU0202 look good enough to be used as a timebase with SL. I will play with a modified algorithm, and see how it compares with the edge-interpolation on the 100 ms pulse from the Garmin - also at lower sampling rates (with sampling intervals longer than 10 us).

Cheers,
  Wolf .