Hi
> On Sep 23, 2017, at 9:39 PM, Hal Murray <[email protected]> wrote: > > > [email protected] said: >> If the main use is feeding test gear (and not direct synthesis) an Rb may do >> pretty well. Most instruments assume a dirty reference signal and clean it >> up internally. > > What's the bandwidth on the typical cleanup PLL? How well does that match > the noise from a Rb? It’s like any other PLL with noise involved. You look at the noise of the Rb, the noise of the particular cleanup oscillator, and your system requirements. In some cases that comes out to a few seconds. For Time Nut grade with a really good OCXO you are at some pretty long numbers. If the Rb starts at 2x10^-11 at 1 second and goes down by square root tau: At 100 seconds you are at 2x10^12. Still not as good as a really good OCXO. At 10,000 seconds you might get to 2x10^-13 (but probably will not). Your OCXO likely will climb out of the “parts in 10^-13” range before 10,000 seconds. Lots of fun. Bob > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
