No. We're just fine tuning the refclock line in chrony.conf. I don't really experience huge jumps. It might fall behind during a reboot because the pi doesn't have an RTC but rather it saves time on shutdown and restores on boot.
Really my only goal is to have somewhat accurate (less than a second) time whether I have internet or not. We've already achieved this, now it's just a matter of making sure GPS doesn't clobber ntp and vice versa. On Aug 14, 2016 7:24 PM, "Bill Unruh" <un...@physics.ubc.ca> wrote: > Is this supposed to be at a time when your system suddenly looses track of > the > time and jumps by hours or days? I see nothing in the gps signal that > indicates anything like that. > > If it is supposed to be at the begining of this sample, please give a > sample > which spans across, not begins at, one of those weirdnesses. > > Note also that probably a copy of the measurements and the refclock logs > ove > onw of those times might be more illuminating. Statistics is rather > processed > already. > > > > > > > William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273 > Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324 > UBC, Vancouver,BC _|_ Program in Cosmology |____ un...@physics.ubc.ca > Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/ > > On Sun, 14 Aug 2016, Chris Greenman wrote: > > Ok I grabbed a sample of the clock statistics. >> >> >> On Fri, Aug 12, 2016 at 2:53 PM, Bill Unruh <un...@physics.ubc.ca> wrote: >> On Fri, 12 Aug 2016, Chris Greenman wrote: >> >> it's a usb puck. so no. Actually I haven't actually looked >> but >> typical USB is +5v data+ data- and gnd. As >> far as I know the only place the pps signal is available is >> inside the >> puck between the GPS module and the usb >> interface. >> >> >> Well, usb serial immitatiors can also immitate the control lines >> from a serial >> line. Thus one of the usb packets can be a simlation of the PPS >> signalalong >> the appropriate serial line. But those are likely to have far >> worse behaviour >> than the actual lines. >> It might however be better than the data phrases usually coming >> along the >> serial line. >> >> >> >> like I said I COULD crack it open and run a new cable that >> included >> the pps line. >> >> On Fri, Aug 12, 2016 at 2:24 PM, Bill Unruh < >> un...@physics.ubc.ca> >> wrote: >> >> >> William G. Unruh __| Canadian Institute for|____ Tel: >> +1(604)822-3273 >> Physics&Astronomy _|___ Advanced Research _|____ Fax: >> +1(604)822-5324 >> UBC, Vancouver,BC _|_ Program in Cosmology |____ >> un...@physics.ubc.ca >> Canada V6T 1Z1 ____|____ and Gravity ______|_ >> www.theory.physics.ubc.ca/ >> >> On Fri, 12 Aug 2016, Chris Greenman wrote: >> >> I CAN hook it up for PPS but it will require >> cracking open >> the puck and it's not that >> crucial for my use >> anyway. >> >> >> Isn't there an output line from the puck which carries >> the PPS >> signal? >> >> >> >> >> >>
