Although the Trimble oscillator has superb phase noise performance, it has
TERRIBLE temperature sensitivity. It appears to be a single oven oscillator,
not a double oven. The PWM'ed fan temperature control implemented in Lady
Heather effectively makes the unit a double oven. Also, by stabilizing the
temperature of the rest of the tbolt electronics and power supply (if included
in the temperature controlled box) you get additional performance out of the
unit. Some testing indicates that a temperature stabilized tbolt/power supply
can improve the performance by an order of magnitude (around 30% of that is due
to issues outside of the oscillator can).
And yes, Lady Heather can control the Tbolt DAC. There is a PID controller
in there for controlling the DAC (based upon the 1PPS error signal, if I
remember correctly... it could be the OSC error signal).
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