On 25/09/11 21:14, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 10:07 AM, Magnus Danielson<
[email protected]> wrote:
I assumed so from the statements relating to time, in particular the PTB
time transfer test proving a 2,3 ns difference. Which still doesn't satisfy
my curiosity.
We still don't have the final PTB report. Here's a preliminary one:
http://dl.dropbox.com/u/13409775/ptb_preliminary_report.pdf
Many thanks. Will read.
A 60 ns offset between the sites would account for the "missing time".
Similarly a 18 m shorter distance would also account for the "missing
time". Due to the large distance I would start in that end to ensure it
works.
The geodesy effort was led by others. I am told they did things very
carefully.
I am sure they where. It's both interesting to see how they went on
doing it, as well as seeing if one can hack it into pieces. Part of the
process I guess.
Do you have direct fiber between the locations?
You mean between CERN and Gran Sasso? No, but that's certainly something
we
could explore for the future.
A fiber-based time-transfer would be nice complementary as it would provide
an independent timing path.
Any ideas on how to proceed? This is unknown territory for me.
Getting a connection setup should not be too hard, but it depends on
number of details, but it is being done on commercial basis. A two-way
transfer system (a few different options may be available) can then use
this connection.
Cheers,
Magnus
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