[time-nuts] Common sky pps errors for any GPSDOs?

SAIDJACK at aol.com SAIDJACK at aol.com
Mon Jan 5 16:58:55 EST 2009


Hi Matt,
 
on Fury we typically see the 1PPS aligned to within +/-25ns or so without  
calibration when two units use the same antenna feed.
 
There is a good paper on the M12+ receiver's accuracy from Synergy/NIST,  
they tested five receivers against UTC (at UTC!!). They came up with a baseline  
error of 2ns over 3 weeks when the units are calibrated.
 
You can find the paper on our website: 
 
   _http://www.jackson-labs.com/docs/Motorola_M12.pdf_ 
(http://www.jackson-labs.com/docs/Motorola_M12.pdf) 
 
We did not do tests over longer baselines yet.
 
bye,
Said
 
 
 
 
In a message dated 1/5/2009 11:32:06 Pacific Standard Time,  
boyscout at gmail.com writes:

The  other concern, of course, is that even if both units were very
close, they  will be exposed to slightly different environmental
conditions (different  A/C settings, different cycling times, etc.).

Are there any good papers  discussing this subject?  Any data out there?

Said -- have you  measured this sort of thing on the  Fury?

Thanks,
Matt





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