maybe some one smarter than us can working with the parameters that Tbolt makes available better performance can be achieved but it is a fact that the frequency is being changed to compensate for time and Tom's frequency data matches our's and we do not care about ADEV, we care about the actual frequency at that moment it goes in to the measuring device and there is room for improvement if you are a frequency nut and are looking for ways to improve. Bob made a good point. In a message dated 9/1/2016 4:27:02 P.M. Eastern Daylight Time, [email protected] writes:
Tom wrote: > No, again it sounds like you have a bad TBolt. Or something is wrong (antenna? reception? time constant? environment? China resoldered parts?). I appreciate that Juerg did lots of testing -- do you happen to have his ADEV plot? > > Your claim of 1e-10 is order(s) of magnitude worse than the TBolts that I see. Something is wrong. I second that (not that any further evidence is necessary following Tom's comprehensive response). Additionally, as far as I know, the units Tom was testing would have had the default tuning parameters (Tom, please comment). Most Tbolts I've seen can be tuned for much better performance than this at tau > 100 seconds, if they are equipped with a 37265 OCXO. Note that the Tbolt has tuning parameters that limit how far the frequency is allowed to wander to adjust the PPS phase -- if Bert's unit(s) have these parameters set to allow very fast PPS recovery, that could well cause the behavior he describes. You should also check all of the other tuning parameters to see if there are errors in the settings. However, rather than mucking about in the myriad tuning settings starting where they are now, I recommend doing a full factory reset to get all parameters back to the original settings. Then (after several weeks of undisturbed running), compare ADEV performance with Tom's graphs. Best regards, Charles _______________________________________________ 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.
