David,
Thanks for the update. The spikes I'm experiencing coincides with the
time when there are 3 or less visible satellites, as predicted by the
Trimble Planning software.
=================================================
I'm glad that's resolved, Gabs. I have seen similar spikes on my systems,
and there's no doubt that an outside antenna with a clear view all round
gives the best results. I'm located on the top floor of a two-storey house
and if I mount patch antennas high up in the work-room they can often get a
"good enough" view. I've recently moved Raspberry Pi #1 into an unheated,
north-facing room, and now the temperature variations are less and slower,
so NTP shows a much more stable offset. Raspberry Pi #1 is running a
"navigation" GPS, and #2 a "timing" GPS, and the temperature variations of
the in-office #2 are the dominant factor:
http://www.satsignal.eu/mrtg/performance_ntp-pn.php
PC Pixie on that plot is driven from a GPS 18 LVC (not the newer 18x),and
that receiver is less sensitive and does need to be outside. It's lying on
the sloping roof here.
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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