[time-nuts] Holdover recovery

[Magnus Danielson]

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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