Thanks for the suggestion. Here is a composite plot with Allan and Hadamard deviations for my tbolt run last night with disciplining disabled. I think I computed Hadamard correctly.
OADEV (blue) has a minimum of 9.6e-12 around tau=790 OHDEV (red) has a minimum of 4.9e-12 around tau=1660 --bruce W1BW On Mon, Jan 26, 2009 at 2:05 PM, Bruce Griffiths <[email protected] > wrote: > > Some idea of the shift in the minimum can be gleaned by plotting the > Hadamard deviation vs tau. > > Bruce Walker wrote: > > 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 > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >
<<attachment: tbolt-allan-hadamard.png>>
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