[time-nuts] Trimble Thunderbolt setup optimization and addinga10811 OCXO

Tom Van Baak tvb at LeapSecond.com
Tue Jul 14 01:27:18 UTC 2009


> Hi Don,
> 
> to disable the Fury (or FireFly) GPS receiver from disciplining the unit,  
> send the command:
> 
>   sync:sour:mode ext
> 
> That will switch the unit to external 1PPS input, and thus make it go into  
> holdover if there is nothing connected to the external 1PPS input.
> 
> Bye,
> Said

Two questions - Will the internal TI value still be updated against
GPS in this case (as it is with the TBolt)?

And, is there also a mode where you just freeze the DAC, that is,
holdover without any compensation (no drift or temp corrections).
This being a trick to temporarily maximize short-term stability, a
way to most closely resemble a standalone free-running OCXO.

/tvb




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