[time-nuts] using Fury GPSDO with Rb
SAIDJACK at aol.com
SAIDJACK at aol.com
Fri Apr 18 17:45:51 UTC 2008
Hi Scott,
that's a great success story!
What final Loop settings do you use on the Fury with LPRO-101?
It would be interesting to see if the +-10ns temperature related deviations
are coming from the LPRO or maybe the GPS, DAC etc? What is the EFC change
over these temp changes?
With the external clock source, it is not easy to use the temperature
compensation of the Fury, but it could be done - need a current sink that is
sensitive to temperature and uses about 50 - 200mA, that can be used as a highly
accurate temperature sensor for the compensation routines.
The digital temperature sensor on the Fury has only 1/16 Deg C resolution,
not nearly enough to do accurate temperature compensation.
bye,
Said
In a message dated 4/18/2008 09:21:01 Pacific Daylight Time, smace at intt.net
writes:
It's working well with the LPRO-101. It stays typically within +-3ns
with excursions to +-10ns based on temp changes (hvac cycling, etc.)
It is very apparent when you plot the temp sensor on the fury.
Scott
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