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, <[email protected]> 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 <[email protected]>
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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