Hi Antonio, Tom, recently I had to unplug my PRS10 Rb from GPS for about 3 days. It drifted a couple 100ns in that time frame.
When I plugged the GPS 1PPS back in, I saw a significant frequency error of a couple of parts to the E-10 while the PRS10 was shifting the 1PPS back onto UTC. Pretty bad for a Rubidium I thought. For such a large phase error I would have expected the PRS10 to just reset the 1PPS rather than drift it. I may have to adjust the loop time constants to be more than 7 hours. To address your question: I would expect the PRS10 to behave in a similar manner when turning it upside down. It would probably take some minutes or longer to re-lock the OCXO to Rb, then correct the OCXO to 1PPS phase error that acrued. Typical OCXO errors for a turn-over test are parts in E-09, that causes a very significant immediate phase drift. Can't try it in my setup unfortunately. bye, Said In a message dated 4/24/2008 15:28:55 Pacific Daylight Time, [EMAIL PROTECTED] writes: Why the XO in a GPS-Rb-XO version should not bear this problem? I understand that Rb itself shouldn't, but what about the controlled XO? (I have an interest in orientation sensitivity of measuring instruments). Thanks, **************Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. (http://autos.aol.com/used?NCID=aolcmp00300000002851) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.