p...@phk.freebsd.dk said: > If you cannot apply the negative sawtooth, you will get better results by > disciplining almost any random quartz xtal, ovenized or not to the GPS, > divide it down to PPS and then discipline the PRS10 to that.
I don't understand that. What am I missing? In the simple case, the main parameter for a PLL is the time constant or cutoff frequency on the low pass filter. Normally, if the time constant is low enough the PLL will track the incoming wobbles. If the time constant it long enough, the PLL will ignore the short term wobbles yet track the long term wanders. In this context, the Rb is very stable so the time constant can be very long. Unfortunately, the time constant of hanging bridges can also be very long, especially if your temperature regulation is good (which is probably a good first step for anything like this). What does putting an extra crystal between GPS and Rb do? What time constants do I use on the PLL from GPS to xtal and xtal to Rb? -- These are my opinions, not necessarily my employer's. 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.
