Hi The proper term for this is a frequency perturbation. It’s a low amplitude coupled resonance in the crystal. Essentially you are sweeping through another resonance as you tune the EFC. The result is a “blip” in the tuning curve. No they aren’t supposed to be there. Yes they do happen.
Bob > On Oct 21, 2014, at 3:12 AM, Hal Murray <hmur...@megapathdsl.net> wrote: > > > time-nuts@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? > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
