[time-nuts] Building a GPSDO & trouble using Jupiter-T

Tom Van Baak tvb at LeapSecond.com
Thu Feb 2 22:56:15 UTC 2012


> This thread got started when someone asked if an analog PLL would work
> for building a GSPDO.  For that you do need timing pulses much faster
> then 1PPS.
> 
> But the analog PLL are not the way to go for best accuracy.

Remarkably, the simplest and still one of the best GPSDO I've
tested was the 10 kHz Jupiter and analog PLL-based standard
by James Miller. It performed superbly. It's the 4th GPSDO at:
http://www.leapsecond.com/pages/gpsdo/

True, there exist some better GPSDO, and you need digital if
you want a hold-over feature, but I wouldn't discourage anyone
from trying the analog PLL method. The sheer simplicity might
more than make up for a few less ns. Miller's page is at:
http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm
http://www.jrmiller.demon.co.uk/projects/ministd/frqstd0.htm

/tvb





More information about the time-nuts mailing list