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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