[time-nuts] looking for low-power system for gps ntp timekeeping NANOSG20

folkert folkert at vanheusden.com
Wed Jul 3 16:49:48 UTC 2013


Hi,

I decided to buy a Nanos G20. Not too expensive, real serial port,
debian linux pre-installed.
I don't want to sound harsh as the people from Nanos probably did their
best to produce a good product, but for timekeeping it is totally crap
and also useless.
Well, unless I did something wrong.
I recompiled the kernel to enable PPS support, installed gpsd and ntpd,
configured at all and let it run for a while.

allan deviation: http://keetweej.vanheusden.com/~folkert/nanosg20/allandev.png

offset: http://keetweej.vanheusden.com/~folkert/nanosg20.png

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
x127.127.28.0    .NMEA.           0 l    3   16  377    0.000  -994.05   7.857
x127.127.28.1    .PPS.            0 l    7   16  377    0.000  -250.13 572.812
+192.168.64.18   .PPS.            1 u   66  128  377    0.553   -0.055   0.033
*192.168.64.2    .PPS.            1 u   99  128  377    0.237   -0.062   0.039
+192.168.64.168  .PPS.            1 u   44  128  377    0.646   -0.013   0.321


Folkert van Heusden

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