Lux, Jim (337C) said the following on 12/23/2009 03:17 PM:
Typical (Cassini, MGS, etc., data from Sami Asmar) UltraStableOscillator (USO) specs as used in spaceflight do about 1E-13 at tau =10 to 1000 seconds, 3E-13 at 1 second. Today, you can probably do maybe an order of magnitude better. These are state of the art oscillators in a vacuum envelope with double ovens, etc.
As far as I know, the best OCXO you can get commercially today is an Oscilloquartz 8607 option 008 BVA (www.oscilloquartz.ch/file/pdf/8607.pdf), which is spec'd at 1.2x10e-13 at 1 second and 8x10e-14 from 3 to 30 seconds. TVB's page at http://www.leapsecond.com/pages/8607-drift shows it's in the 13s out to 10K seconds. The spec sheet says the aging may be <3x10e-12/day after 30 days operation (there's one option for best aging, and another for best short term stability; it's not clear whether you can get both in the same package).
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