[time-nuts] Holdover recovery

[Azelio Boriani]

Yes, very interesting, good to have. I see differences: the most
notable is the plot of page 12 on the original italian version that is
missing on the ITU paper, that goes with the figure 4 on page 7 (of
the ITU one).

On Tue, Apr 5, 2016 at 12:57 AM, Magnus Danielson
<magnus at rubidium.dyndns.org> wrote:
> Hi,
>
> I had not seen the ITU-R version, nice.
> I have their paper and shared it with Hal on the side.
>
> This ITU-R version seems about the same, but I've got their names on it. I
> got a copy of their paper in english without their names on it, which might
> have been their input contribution to ITU-R. I then demanded a version with
> their names on it, so that I could share it, within a day I had that. When
> someone covered this aspect, why not spread it and they get the credit for
> it?
>
> I've visited them and seen this setup.
>
> Cheers,
> Magnus - who just got back to lodging/dorm-room after discussing things with
> Attila
>
>
> On 04/05/2016 12:01 AM, Logan Cummings wrote:
>>
>> My Italian is not very good, but I think this is the English translation
>> via ITU:
>>
>> https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2253-2012-PDF-E.pdf
>>
>> -Logan
>>
>> On Mon, Apr 4, 2016 at 1:10 PM, <timeok at timeok.it> wrote:
>>
>>> Here the italian version:
>>>
>>> http://www.crit.rai.it/eletel/2012-1/121-2.pdf
>>>
>>> Luciano
>>> www.timeok.it
>>>
>>>
>>> On Mon 04/04/16 21:28 , 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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