[time-nuts] 10811 crystal orientation

[SAIDJACK at aol.com]

Hi Bjoern,
 
as mentioned by someone else, most g-insensitive GPSDO products are  
probably going into military applications.
 
But I could think of a number of commercial applications where a GPSDO is  
used in a vehicle and exposed to some tilt and lot's of vibration and 
vehicle  acceleration. Also, if one needs ultra-low phase-noise, then a low-g OCXO 
 will reduce any vibration/shock-induced error to show up on the output, as 
 could be produced by a fan or other noise/vibration source. Satellite 
uplinks  come to mind here. Or the house-cleaner running the vacuum cleaner 
through the  lab...
 
bye,
Said
 
 
In a message dated 7/11/2009 02:56:18 Pacific Daylight Time,  
bg at lysator.liu.se writes:

Hi  Said,

What GPSDO-products do compensate for tilt?

It seem like a  major error source -- if the user for some reason want to
tilt a unit in  holdover. It seems to be a "low hanging fruit" to attenuate
this error  substantially even with a $2 MEMS accelerometer.

Once the ambitions  grow -- more complexities can be added.

Then again, is there a use-case  giving some hope the engineering costs can
be  regained.