[time-nuts] GPSDO TC
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Thu Jan 8 22:36:53 UTC 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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