[time-nuts] Best GPS 1PPS Accuracy

[SAIDJACK at aol.com]

In a message dated 12/14/2006 16:46:10 Pacific Standard /tvb  writes:

The  beauty  of a GPSDO is that you're only changing
the DAC every few  minutes so  there's plenty of time
to look carefully at the quality of  your 1 Hz  samples
before you commit the DAC update.

It would  be a more  difficult problem if you needed to
update the DAC in   realtime.

/tvb



Hi Tom,
 
one thing I noted in the PTTI paper on the CNS Clock II block  diagram that 
was recently published here was that the CNS clock II is  outputting a raw but 
sawtooth corrected version of the 1PPS.
 
_ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdf_ 
(ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdf) 
 
This 1PPS will suffer from the jitter not recognized by TRAIM  that we are 
talking about.

I wonder why they did not use the OCXO output DIV 10E6 to generate a  clean 
1PPS, since this is so much more stable as you mentioned?
 
Or is there a mistake in the block diagram?
 
bye,
Said