[time-nuts] GPSDO Alternatives

Azelio Boriani azelio.boriani at screen.it
Wed Dec 5 21:32:24 UTC 2012


Don't forget that an OCXO needs faster than 10K seconds EFC updates, that's
why you need resolution first.

On Wed, Dec 5, 2012 at 10:24 PM, Volker Esper <ailer2 at t-online.de> wrote:

>
> Am 05.12.2012 18:31, schrieb Bob Camp:
>
>> Hi
>>
>> If the intent is to come up with something in the same league as the TBolt
>> there are a few other things you will need:
>>
>> 1) Something to compare the two pps signals to within 0.1 ns....
>>
>
> Following Ulrich Bangerts suggestions, that a loop time constant should be
> at about 3 hours (GPS disciplining an OCXO), do I really need that
> resolution? Ok, the more accurate, the better. But the question is: can I
> reduce this requirement when using long time constants (10000s)? The ratio
> then is 10E14...
>
> Volker
>
>
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