[time-nuts] Holdover recovery

[Azelio Boriani]

In italian:
<http://www.crit.rai.it/eletel/2012-1/121-2.pdf>
Can't find it in english...

On Mon, Apr 4, 2016 at 9:28 PM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> Hi Hal,
>
> On 04/04/2016 05:39 AM, Hal Murray wrote:
>>
>>
>> Has anybody studied what happens when a GPSDO comes out of holdover?  Has
>> anybody seen any specs?  I don't think I have.
>>
>> I think you have a choice of quick recovery for time or frequency, but you
>> can't get both.
>>
>> Suppose your setup has been in holdover for a while.  The frequency is
>> slightly off.  The time offset of the PPS pulse will be the integral of
>> the
>> frequency offset.
>>
>> What happens when you come out of holdover?  If you fix the frequency, the
>> PPS will stay off.
>>
>> Suppose the PPS has drifted by 1 ns.  If you correct that in 1 second, the
>> frequency will need to be off by 1E9 during that second.
>
>
> The RAI laboratory in Torino have made such tests and published measurements
> and recommendations. For a long time it was only available in italian, but
> there is now an english version available.
>
> Cheers,
> Magnus
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