[time-nuts] GPSDO & Crystal Aging

Brooke Clarke brooke at pacific.net
Thu Apr 10 15:42:43 EDT 2014


Hi:

AFAICR the HP GPSDOs included the idea of measuring the aging rate of the crystal and applying that correction during 
holdover.
This was also mentioned by Brooks Shera in relation to his GSPDO (there was a plot), but I don't think it was part of 
the firmware?

So rather than just locking the control voltage to the last used value it would be much better to add a linear ramp.
<http://www.rt66.com/%7Eshera/>

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html




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