[time-nuts] GPSDO TC

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Jan 8 17:36:53 EST 2009


Björn Gabrielsson wrote:
> On Fri, 2009-01-09 at 11:09 +1300, Bruce Griffiths wrote:
> [...snip...
>
>   
>> My point was that measurements are required to establish the optimum for
>> each individual OCXO not just for a given OCXO model.
>>
>> Bruce
>>     
>
> Are those measurements possible to do in real time with only the GPSDO?
>
> --
>
>    Björn
>
>
>   

Björn

Not really, however one can measure the relative ADEV as a function of
tau for the free running OCXO and the timing receiver.
There will be a broad minimum at some tau. The optimum time constant may
lie somewhere in the vicinity of that minimum.
Its probably impossible to do much better than that without a nice
stable statistically independent (for all tau) frequency standard.

Bruce




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