[time-nuts] Inexpensive modular gps with 1pps
David J Taylor
david-taylor at blueyonder.co.uk
Fri Nov 16 06:58:05 UTC 2012
-----Original Message-----
From: Hal Murray
[]
There is another variable to consider: cold start vs warm start. If it
doesn't know the time or doesn't have a recent copy of the satellite orbit
info, it has to search a lot harder to get locked up.
When you get a chance, disconnect it for an hour and try again. I'm
assuming
it has a battery backup so it can keep track of time. Or watch the number
of
satellites it can see and compare that with other receivers in a similar
location.
========================================
Yes, it's the cold start which is the problem in this case. According to
the specification it should take 35 seconds (typical), but it needs a signal
20 dB higher than the tracking level to achieve this...
Tried you suggested test, and re-acquisition was fast - yes, it has battery
backup; a feature I now consider essential!
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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