[time-nuts] low-g OCXO GPSDO

SAIDJACK at aol.com SAIDJACK at aol.com
Thu Jun 5 13:02:21 EDT 2008

Hi guys,
my apologies for the commercial part in the email.
Does anyone have information on the typical g-sensitivity of  
crystals/oscillators? We see about 1 to 2E-09 frequency change when turning  typical OCXO's 
around on their back (a 2g turn-over).
We introduced a low-g GPSDO that is especially useful in mobile  
applications, for example inside a vehicle, or carried around by a user in  a backpack etc.
A "normal" OCXO would drift significantly when being turned around in any  
direction. That's one of the big advantages of Rb's, they compensate for the  
crystal error after a short drift...
For that kind of use, we are putting a special very low-g OCXO on our board  
to reduce the frequency drift as much as possible (>10x improvement desired  
over a standard crystal). You can see a picture in our press release  at:
I am very interested to see what experience folks have with low-g  crystals 
and OCXO's.
Does anyone have experience with using active Crystal compensation for  
varying g-vectors? How about special crystals, or three-axis-crystal compensated  
systems etc?

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