Wolf,

Thank you, I will capture per your suggestion some images (and rms 
measurements) of jitter between the Thunderbolt E and other GPSDOs at four or 
five time intervals in case this information is of interest to the group.   

Thank you also for the CMOS 4093 10 us monoflop /E-MU0202  information, and for 
any info on your prospective comparison with the 100ms Garmin pulse.

Very grateful for the considerable benefits that SpecLab regularly provides.

73,

Jim AA5BW  

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Wolfgang Büscher
Sent: Wednesday, October 26, 2016 5:46 PM
To: [email protected]
Subject: Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2

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 .