The sawtooth error in the PPS output and how they were able to correct it externally was interesting. I have seen that kind of problem before in DDS and other applications.
I wonder what other GPS receivers provide either PPS outputs without sawtooth noise or a correction message. On Sun, 29 Jan 2012 20:40:52 -0800, Hal Murray <hmur...@megapathdsl.net> wrote: > >> What do you mean by "average"? Do you mean that the GPS and PLL must be >> kept on for "20 minutes to hours", or did you mean that the PLL loop filter >> must have a time constant of 20 minutes to several hours? > >You have to compare the characteristics of the oscillator with the >characteristics of your GPS receiver. > >If your local oscillator is very stable, then you want to average over long >times (hours, days). If your local oscillator is a good thermometer and you >have a very good GPS receiver, then you want a shorter time constant >(minutes) so you can track temperature changes. > >Do you know about hanging bridges? If not, please read Timing for VLBI by >Tom Clark and Rick Hambly. It's got some wonderful graphs. Once you >understand those, this discussion will get much more interesting. > http://gpstime.com/files/tow-time2009.pdf _______________________________________________ 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.