> Le 14 août 2018 à 04:29, Chris Caudle <[email protected]> a écrit : > > On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: >> I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO >> that I am using to steer a PRS10 RFS. I'm a little confused on where the >> 1PPS is coming from with respect to the GPSDO. > > A GPS disciplined oscillator contains a GPS receiver which outputs 1PPS > based on receiving the GPS signals and calculating the position + time > equation. That PPS signal is noisy in time, it jitters around relative to > the ideal 1 second period. The GPSDO implements a long time constant PLL > to synchronize the output of the OCXO to the long term average frequency > and phase of the GPS PPS, so what you see externally is 10MHz directly > from the OCXO, 1 Hz (PPS) which is divided down from the 10MHz OCXO, and > those are controlled by a PLL so that long term the phase of the PPS > divided down from the OCXO follows the PPS calculated by the GPS receiver, > but with lower jitter. > > -- > Chris Caudle > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.
Don’t worry about how powerful the machines are. Worry about who the machines are giving power to. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
