On 11/2/19 1:15 AM, Hal Murray wrote: > > rlaa...@wiktel.com said: >> I'm curious if this would provide any meaningful improvement in system clock >> accuracy, for NTP, if I'm already a GPS PPS hat. If there's a reasonable >> chance this could be interesting, I'm thinking about ordering a couple and >> "sacrificing" a Pi 3 and/or Pi 4. > > What are your goals? NTP server? Neat graphs?
Closer to the latter. > The Pi 3 has Ethernet on USB. That adds a layer of jitter to packet timings > so a Pi 3 even with GPS will never make a great NTP server. Right, though a Pi 4 may be better. > How stable is your temperature? Self heating as the CPU load changes is > important even if the room temperature is stable. A TCXO won't help if the > temperature is already stable. The graph in ntpviz shows the jitter and temp almost perfectly correlated. > If you have 2 identical Pi-s, you could put the TCXO on one and run a > side-by-side comparison and tell us what happens. Right, that's the sort of test I had in mind. -- Richard _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
