On Mar 1, 2012, at 11:41 AM, Brooke Clarke <bro...@pacific.net> wrote:

>Are there any WWVB disciplined oscillators (WWVBDO)?

I have a couple of Spectracom 8164 WWVB DOs running.  They bounce around by a 
part or three in 10e10.

The 8164 uses an FLL that does 1000 second counts of the internal OCXO 
reference vs. a 10 MHz crystal that is tightly locked to the WWVB carrier.  An 
algorithm adjusts a DAC based on the counter results, after applying sanity 
checks (e.g., I think it requires two or three consecutive counts within some 
tolerance before it makes an adjustment).

John

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