[time-nuts] LTE-Lite module
hmurray at megapathdsl.net
Tue Oct 21 03:12:36 EDT 2014
time-nuts at febo.com said:
> The problem is that the ocxo maintains its frequency even though the EFC
> control voltage is changing. Thus phase error is accruing making the efc
> larger and larger due to the P term.
> Then at some point the crystal 'snaps' and jumps in frequency, overshooting
> the desired frequency and causing the P term to start pushing in the
> opposite direction repeating the cycle.
Does anybody understand the mechanism behind that behavior?
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