Hi >From what I have seen, both uBlox and Furuno are very consistent in their serial timing. I’ve looked at a lot of modules, but those two come to mind pretty quick.
Bob > On Jul 15, 2016, at 4:50 PM, Hal Murray <[email protected]> wrote: > > > [email protected] said: >> Well, if you actually sit down and measure the serial timing on a modern GPS >> module, you will find that it is very consistent. That degrades quickly if >> you enable a few dozen sentences. Sub 10 ms accuracy is not a tough target >> to hit when standing still. > > Do you have brand names/models for units that give good serial timing? (or > even reasonable?) > > All the ones I've tried have ballpark of 100 ms of wander. The short term > jitter is in the ms range but the long term wander is more like 100 ms > peak-peak. I assume it's a firmware screwup, probably because it didn't get > into the requirements sheet. > > The last time I looked carefully was quite a few years ago. Maybe one of the > newer brands is reasonably good. > > The Garmin 18 was reasonably good. The 18x is crap. I assume they > outsourced some of the work rather than updating their old firmware. > > In case anybody is concerned about the PC end of serial timing, I have good > data from a Z3801A feeding Linux. With ntpd's filtering, it's well under a > ms. > > > -- > 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.
