> It looks like their is as infinitely small chance of being able to get 5065. > So what can be done with the telco Rb's (mine are analog tuned) to > wring the best possible performance from them? Sooper Duper power > supplies, Peltier (sp) cooling modules? > Regards, > Perrier
Hi, I'm always a bit surprised that it's not done more. Adding temperature control, air pressure compensation and drift compensation transforms the medium to long(ish) term performance of a lot of rubidiums. A typical Adev plot for a rubidium starts increasing again after a few 1000's of seconds as environmental factors take their toll, but with even a simple version of these mods it's more like days. This makes it a great reference for testing GPS receivers and GPSDO's among other things. A basic setup could be something like an LPRO in a temp controlled enclosure, with an analogue pressure sensor feeding into an EFC circuit, both temp controlled with the LPRO. Log it against GPS and you get the long term (like weeks+) ageing which can then be removed. Even simpler, you could just log the air pressure and correct for that too, but that's more of a pain if it's being used as a general purpose reference. Of course, the problem then is testing just how good it is.... Angus. _______________________________________________ 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.