phk has a Stanford Research Systems PRS10 Rubidium Frequency Standard (0 MHz rubidium oscillator)<http://www.thinksrs.com/products/PRS10.htm> at his home. Serial # 005597. The short-term stability of this unit is about 5 × 10-12
This particular PRS10 is GPS referenced _and_ drives one of his GPS referenced NTP servers.
He also has (or had) an array of 10 Motorola Oncore UT+ or M12+T GPS receivers sitting on a row 20cm apart, mounted on a shed roof.
The frequency stability "sigma" of MC #2 has been < 2 x 10-15 during the last year.
NIST-F1, the nation's primary time and frequency standard, is a cesium fountain atomic clock developed at the NIST laboratories. The uncertainty of NIST-F1 is continually improving. In 2000 the uncertainty was about 1 x 10-15, but as of January 2013, the uncertainty has been reduced to about 3 x 10-16
So, no, not "more precise" than the clocks you list, but how many of us have a Rubidium standard in our home?
(And when compared to the large number of clocks in the world, yes, I think that the PRS10 is "one of the most precise".)
So more precise than all of the clocks in the world once you exclude "the most precise clocks in the world"?
Yes, MC#2 is a hydrogen maser clock. But you failed to mention that it is driven by an ensemble of 41 clocks, 4 rubidium fountains, 19 hydrogen masers, and 18 5071 cesiums. And if we are talking about NIST-F1, don't forget F1's new friend, NIST-F2, that is three times as accurate and soon enough the Italians will have there very own version IT-CsF2. And then there are the lattice clocks from JILA...
This particular PRS10 is GPS referenced _and_ drives one of his GPS referenced NTP servers.
He also has (or had) an array of 10 Motorola Oncore UT+ or M12+T GPS receivers sitting on a row 20cm apart, mounted on a shed roof.
UTC(USNO) is provided by the USNO Reference System #2 (Master Clock #2), which is a Datum Inc. hydrogen maser http://tycho.usno.navy.mil/maser.html
The frequency stability "sigma" of MC #2 has been < 2 x 10-15 during the last year.
NIST-F1, the nation's primary time and frequency standard, is a cesium fountain atomic clock developed at the NIST laboratories. The uncertainty of NIST-F1 is continually improving. In 2000 the uncertainty was about 1 x 10-15, but as of January 2013, the uncertainty has been reduced to about 3 x 10-16
So, no, not "more precise" than the clocks you list, but how many of us have a Rubidium standard in our home?
(And when compared to the large number of clocks in the world, yes, I think that the PRS10 is "one of the most precise".)