[time-nuts] Double Oven Tbolt

WarrenS warrensjmail-one at yahoo.com
Tue Feb 23 19:10:54 UTC 2010

It is said a picture is worth a thousand words, A good graph even more.
Attached is a Lady Heather, 2 day long plot showing the difference in performance 
of a TBolt GPSDO disciplining a Double Oven and a Single oven HP10811 Osc.
The Single oven Osc is the same exact Osc and setup with its outer oven turned off.

The single oven mode shows a Freq TC drift of about 6e-11 / deg C
As can be seen in the plot, the TBolt controller has to work much harder chasing the single oven's drift.
Still the effect of the LH reported Osc Noise is minimum  (4 vs. 5 ppt)
Where as the difference in phase noise is about 4 times worse using the singe oven  (1.75 vs. 7 ns)
Both configurations have the same Tbolt settings which where optimized for the double oven osc.
A lower time constant setting on the Tbolt would of helped the single oven Phase noise at and expense of the double oven Osc noise.


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