I've had a specific GPSDO running for some time now, and I notice that the noise at tau 1s has gotten worse as the retrace flattens out. In this case, the ADEV was about 3.6E-11 a month or so ago, and has now gone up to about 8.5E-11. (Measurements performed by a 5370A against a PRS-45A Cs standard.) Is this normal as the startup drift settles out? It's been on the same power supply module during this time, but I have been using it to test new code, so the DAC has been cycled from midpoint to lock numerous times. Another unit that's been running for some time has done essentially the same thing. Weather? Environment? GPS demons?
Bob - AE6RV ----------------------------------------------------------------------------------- GFS GPSDO list: groups.yahoo.com/neo/groups/GFS-GPSDOs/info _______________________________________________ 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.
