I ran the same test as Bruce Griffiths on my tbolt; that is, I turned off osc disciplining altogether and created an OADEV plot from the internal phase measurements taken from its GPS solution. The plot is attached. It has a minimum of about 1e-11 at tau=800, and it has the sane general shape as Griffiths'.
The next experiment I plan to do is to repeat the same thing using manual holdover mode rather than "Disable disciplining". That should continue to try to compensate for temperature and long-term drift (just not steered by GPS), whereas the data taken last night use a fixed DAC. --bruce W1BW
<<attachment: tbolt-no-discipline.png>>
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