On Tue, 7 May 2019 11:36:55 -0400 Bob kb8tq <kb...@n1k.org> wrote: > Before we start hearing “well, noting ever breaks these days” …. how is the > Galileo system doing for frequency standard reliability ? :)
The PHM seem to suffer from an inherent problem in space. I had the chance to talk to some of the people from Spectratime last year at EFTF and learned that the US had the same problems with hydrogen masers in space. They couldn't solve it so they dropped the idea of using them for GPS. Unfortunately, this knowledge ended up only as a sidenote somewhere and the Galileo people learned of it only _after_ they had problems. AFAIK, the root cause of the problem is still not know, but continuously running the PHM seems to mitigate it. The RAFS IIRC had a nice combination of slight design oversight and too eager testing, where the test procedure made the device unrealiable. AFAIK this has been fixed quickly and the last couple of launches shouldn't have any problems. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neal Stephenson _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.