Hi Antonio, not an expert on space qualified crystals, but I would think that in general Cesium and Rubidium crystals would be steered very quickly (within seconds?) to correct for any crystal jumps that surely will happen even, or especially in space. In a GPSDO, we generally only have one correction pulse per second from the GPS, and that one is even noisy and needs to be filtered. In an atomic clock, we can steer the crystal without this 1Hz limit. A good gps receiver will use over-determination and not use a single sat to generate the 1PPS. And even then a GPS 1PPS is expected to be noisy. Bye, Said In a message dated 6/26/2009 16:26:22 Pacific Daylight Time, [email protected] writes:
this post wouldn't be merely speculative, I have an actual interest in knowing if what I'm going to ask is possible. As it has already been discussed here, crystals may jump in frequency. If I recall, about 20% of good quality crystals are prone to jumping, but a crystal that used to jump might not jump anymore, a crystal that never jumped might jump in the future, and so on. _______________________________________________ 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.
