Bruce What was the record length?
TOTDEV and TOTHadamard should give more reliable estimates over a greater tau range. Bias corrected Theo_1 and the Hadamard equivalent should be even better at longer tau. Bruce Bruce Walker wrote: > 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.
