Hi A lot depends on just how much "smarts" is behind the little green light. There's not a lot of information about what they are (or aren't) checking before the light goes green.
One possibility: Check that you have sats in a good constellation for > 24 hours (= check antenna location) Check C/N on sats stay > 30 db for your constellation (= check feed line and location) Check that temperature is stable < 4 C for 24 hours (= check Rb environment) Check the drift rate of the RB is < 1x10^-11 over the 24 hour period (= make sure the Rb isn't broken) Make sure the lock is stable and the AVAR (or equivalent) looks reasonable (= make sure the loop is working) Another possibility: Turn on the green light after we've been locked for > 1 hour (= all must be well if it locked ....) I'd be a lot more comfortable if I knew that the first set of rules were being used than that the second set. If I actually expected to pass an audit of my setup, then having the basic algorithm information would be needed. Bob On Jun 28, 2010, at 4:57 PM, Michael Baker wrote: > Hello, Time Nutters-- > > Traceable to NIST...? All you need is this LPRO Rb osc being > disciplined by a GPSDO and you can claim NIST traceability? > > Not the way I understand the rules.... > > http://www.tenmhz.com/GPSDO.htm > > What say the list? > > Mike Baker > ---------------------- > > > Today’s communication devices and protocols often require > > an accurate timebase. Leveraging the best technology of > > yesterday and today, we are proud to bring you the world's > > first rubidium GPSDO under $500! The LPRO-101 by Efratom® > > /Symmetricom®, stabilized by a high-sensitivity GPS system, > > provides affordable, traceable precision. Watch our DEMO > > * Features: Guaranteed Accurate to < 5x10-11, > Traceable to NIST when LED is green > > * Typical accuracy is even better → Typical Accuracy Charted > * Low phase noise 10 MHz, 50Ω BNC output at +7 dBm > * Includes power supply and high-gain GPS antenna > * Phase Locked for absolute accuracy over long time intervals > > _______________________________________________ > 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.
