Hi 20 hours should be 20*60*60 = 72000 samples. The graphs appear to show about 17,000 samples.
If the results do cover a 20 hour period and do not have drift removed, that's a good FE5680. 1.4x10^-14 is an amazing number for one of those. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Fabio Eboli Sent: Wednesday, December 12, 2012 2:10 PM To: [email protected] Subject: [time-nuts] MT3339 PA6H and Racal Dana GPIB, update Racal 1992 GPIB, to Chuck Forsberg: thank you, I will go to see your work. A little update, after about 20 hours this is the logging situation: http://www.flickr.com/photos/14336723@N08/8267828444/ Not bad, seem the GPS chipset jitter claim of 10nS is real, what do you think. Could this unit be a decent one for a GPSDO attempt? The values are the difference from 1s value in ns: Blue: (1-Period)*1E9, left y axis Red: Boxcar average 100 samples, right y axis Yellow: same as red 1000 samples. I had only few glitches, that are filtered out in the previous calculations: http://www.flickr.com/photos/14336723@N08/8266795789/ one with a reading of precisely 1,5s (the negative one) and a periodic lack of record, the positive values. This Rb unit seem pretty close to the mark, more than another unit I have. I'm thinking to try the other method Azelio Boriani advised me to do (26 november 2012), using the pps output from this Rb as a reference. If I understand well, I should use the Rb as start and the GPS as stop on the counter, measuring the phase, and I should see a very long time before the signals cross. The pulses relative position will be obtained with a little luck :) Fabio. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
