Here is a plot of the Thunderbolt cold starting with the "initial DAC voltage" 
setting set to the peak value of the initial spike (and not the 10.000000 MHz 
setting).   The upward spike when the unit starts tracking sats (it took around 
twice as long to start tracking sats) is gone, but the DAC voltage had a new 
little glitch in the curve when it started disciplining the oscillator.  Once 
the disciplining got underway,  not much was different between the three 
different initial DAC voltage settings.

General conclusions...  the initial DAC voltage setting does not affect the 
overall disciplining, but can affect the time it takes to start tracking sats.  
 Your best initial DAC voltage setting is probably at the 10.000000 MHz point 
that the auto-tune function uses.
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