[time-nuts] Fw: New to list and GPSDO questions

Bob Stewart bob at evoria.net
Thu Jun 13 17:10:34 EDT 2013


Isn't the VE2ZAZ circuit functionally equivalent to your example 3?  Granted, he's not picking the 10 millionth transition and checking its phase 
difference to the reference, but I've only got a 1PPS reference with a 
1uS or so jitter from pulse to pulse.  Bert is averaging over 16 
seconds, and creating a PWM signal to drive an integrator (simulating a DAC), which will drive a Trimble 34310-T.  And like I mentioned 
earlier, I just like the way Bert did it.  It has a kind of elegance 
that appeals to my inner hacker.  =)

Bob - AE6RV

----- Original Message -----
> From: Attila Kinali <attila at kinali.ch>
> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Cc: 
> Sent: Thursday, June 13, 2013 3:39 PM
> Subject: Re: [time-nuts] New to list and GPSDO questions
> [3] Describes how to use a clock
 synchronizer to build a GPSDO. Probably
> not the easiest and not the cheapest way, but definitly one with a very
> low parts count.
> [3] The AD9548 as a GPS Disciplined Stratum 2 Clock, by Gentile, 2009
> http://www.analog.com/static/imported-files/application_notes/AN-1002.pdf

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