[time-nuts] Thunderbolt Power Question

[Mark Sims]

An earlier question concerned whether the Thunderbolt could be put into battery backup mode without the -12V supply.  The definitive answer is NO!  

The Thunderbolt OCXO is controlled via a DAC voltage that can range from -5V to 5V (the standard oscillator control is -5Hz/V.  All mine are operating at around 0.35V).  The -5V DAC reference depends upon the -12V input supply.

Also the Thunderbolt monitors all three supply voltages and it will throw a critical alarm condition when any are out of whack.
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