[time-nuts] Rb vs.Crystal OCXO

Hans Holzach 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

    thank you,



There is an easier method that does not jiggle the board mechanically:

The command:


Disables the disciplining.


Re-enables disciplining.

The sync:tint? command can be used to check the drift while in holdover..


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