[time-nuts] GPS W/10KHz

Volker Esper ailer2 at t-online.de
Sat Feb 8 17:50:52 UTC 2014


Thanks, Chris, I didn't gather that from his posting. It'd be up to
Perrier to illuminate that point.

Volker


Am 08.02.2014 18:33, schrieb Chris Albertson:
> On Sat, Feb 8, 2014 at 3:44 AM, Volker Esper <ailer2 at t-online.de> wrote:
>
>> you don't need 10kHz to build a GPS disciplined oscillator. GPSDOs are
>> build with control loop response times in the range of some hours, so
>> the loop will be absolutely happy with a 1PPS input.
>>
>
> Of course you are correct.  Most GPSDOs are driven with a 1Hz pulse.  But I
> think maybe the OP is not building just any GPSDO but maybe he is looking
> to repair a specific GPSDO that is designed to use the old (and now rare)
> Rockwell GPS.      If that is the case he needs the old Rockwell or needs
> to redesign his system.
>
> If you are starting from scratch to build a new GPSDO it's easier now.  All
> you need is some kind of a phase detector (74HC4046 ?) and a small uP that
> has a good built-in DAC.  The uP checks the phase once per second and
> adjusts it'sDAC accordingly.




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