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[time-freq] Rubidium standards

Randy hamradio at oz.net
Fri Feb 8 17:15:08 UTC 2008

I see advertised once in a while Rubidium frequency standards that include
the following statement:

"The Rubidium standard is carefully calibrated to a GPS Disciplined

I thought those standards were based on the atomic physics of Rubidium and
that was what determined the frequency.  Why do they need to be "calibrated"
at all?  This also suggests that a GPS-disciplined oscillator is better than
the Rubidium standard.  It that true?  Are the HP Z3801 oscillators, for
example, ordinarily more accurate than a good Rubidium standard?


Randy Stegemeyer, W7HR
Port Orchard, WA

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