[time-nuts] Rb vs.Crystal OCXO
hans.holzach at gmail.com
Mon Apr 28 08:24:26 EDT 2014
if i understand correctly, while in holdover, activated by
sync:hold:init, temperature and aging compensation are still active
(as it should be). however, to measure drift, i have to somehow
disable these compensations, haven't i?
yesterday, i wrote down the values of temperature and aging
compensation, then set both to 0. in holdover the software does not
seem to recalculate the values, at least not during the hour or two
i had the oscillator unlocked. on uli's Z38XX the EFC curve was
flat, unlike when temperature and aging compensation are active (or
not 0) during holdover. one hour or so after sync:hold:rec:init i
checked the values again, and they were very close to the values
before i reset them to 0.
my question is: would this be the correct procedure to have a truely
unlocked oscillator: start holdover and then set tempco and aging to
There is an easier method that does not jiggle the board mechanically:
Disables the disciplining.
The sync:tint? command can be used to check the drift while in holdover..
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