David thats what I was looking for thanks. At 4 watts that is impressive. Regards Paul WB8TSL
On Sat, Dec 15, 2012 at 2:07 AM, David J Taylor < [email protected]> wrote: > From: paul swed > > > Thanks. > I really like the idea that a Rassberry Pi could be a time server. Maybe > enough to get me going. > Thanks > ==============================**= > > Paul, > > I wrote up my experiences with the Raspberry Pi as a standard NTP server > here: > > > http://www.satsignal.eu/ntp/**Raspberry-Pi-NTP.html<http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html> > > and the performance can be seen here: > > > http://www.satsignal.eu/ntp/**Raspberry-Pi-NTP.html#current<http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#current> > > http://www.satsignal.eu/mrtg/**performance_ntp-pn.php<http://www.satsignal.eu/mrtg/performance_ntp-pn.php> > > Interestingly, the second RPi card is doing better than the first, and it > does /not/ have gpsd installed, so relying on the LAW/WAN for its source of > coarse seconds. But it has a timekeeping GPS and a slightly better > located antenna as well - both antennas are indoors and some drop-outs show > as spikes on RasPi-1. No gpsd appears to mean less CPU load. Compare: > > > http://www.satsignal.eu/mrtg/**performance_raspi-1.php<http://www.satsignal.eu/mrtg/performance_raspi-1.php> > > http://www.satsignal.eu/mrtg/**performance_raspi-2.php<http://www.satsignal.eu/mrtg/performance_raspi-2.php> > > It looks like sub-microsecond might be possible in a > temperature-controlled environment, as the main drift seems to be at 05:30 > when the heating turns on: > > > http://www.satsignal.eu/mrtg/**performance_ntp.php?period=**week<http://www.satsignal.eu/mrtg/performance_ntp.php?period=week> > > Raspberry Pi 2 was only switched to GPS from LAN-only sync a few days ago. > > Cheers, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<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.
