[time-nuts] RaspberryPi and RADclock

paul swed paulswedb at gmail.com
Sat Dec 15 19:07:05 UTC 2012


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 <
david-taylor at blueyonder.co.uk> 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: david-taylor at blueyonder.co.uk
>
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