[time-nuts] GSP clock stabilitiy, Rb vs Cs

[Poul-Henning Kamp]

In message <BB05041D-F03A-42AC-85C6-467110FC3466 at leapsecond.com>, "Tom Van Baak
 (lab)" writes:

>Rule of thumb: quartz is best short term, Rb or H-maser mid-term,
>and Cs by far the best long-term.

I have never seen a technical description of the Cs used in the
early GPS satellites, but I have seen many references to all sorts
of troubles with them, including a much shorter lifetime than
was hoped for.

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