[time-nuts] low-g OCXO GPSDO

[Rob Kimberley]

Said,

See my post to Matt. I have some useful info on g correction techniques. 

Rob Kimberley 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of SAIDJACK at aol.com
Sent: 05 June 2008 18:02
To: time-nuts at febo.com
Subject: [time-nuts] low-g OCXO GPSDO

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:
 
   _http://www.marketwire.com/mw/release.do?id=865007&sourceType=3_
(http://www.marketwire.com/mw/release.do?id=865007&sourceType=3) 
 
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?
 
thanks,
bye,
Said
 
 





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