In message <[EMAIL PROTECTED]>, Brooke Clarke writes: >BUT, if instead of using a fixed control voltage, a Ramp is used then >this will not happen. Now instead of using GPS to control a fixed >voltage it's used to control the slope of the ramp. > >What am I missing?
I've played with a PLL which estimates not only frequency error but also frequency drift, and have found that it is very very tricky to get a consistent result with averaging times less than days. The driftrate of a good OCXO is below a lot of noise factors so I have only been able to estimate it reliably on weekly timescale. The next thing is that once you do that, you realize that the noise in the frequency estimate makes it almost totally pointless to apply the drift correction unless you anticipate very long synchronization outages. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
