On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
I was about to ask for the specific papers of time calibrations, even if
the overview presentation indicates that the verification steps I expect to
be there have been done. Also the path calibrations needs
On 25/09/11 08:35, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
I was about to ask for the specific papers of time calibrations, even if
the overview presentation indicates that the verification steps I expect to
be there have been
Fiber has to follow the curvature of the earth I do not think neutrinos
do. Bert
In a message dated 9/25/2011 4:08:42 A.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
On 25/09/11 08:35, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson
What about rotation of the earth?
Jim Cotton
n8qoh
On 9/25/11 2:35 AM, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 1:36 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
I was about to ask for the specific papers of time calibrations, even if
the overview presentation indicates that
In message
CAHBYzfTXMdD3onFJxAMQN==jv1lrlh1s7enwnrvzlhjov6p...@mail.gmail.com, Javier
Serrano wr
ites:
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.
700km is too far to expect a dark
One other thing is that some spectrum analyzers aren't really designed
for low noise performance. Since the noise floor is often pretty high,
the design of the whole RF chain (e.g. spur levels and such) might have
assumed that lots of things would be hidden in the grass.
True, it's one of
Do you know how the HP/Agilent 4395A stacks up as a SA? I really like
the true RMS power detection and the 1 Hz RBW (not video).
If you want low noise in a spectrum analyzer it all comes down to the
signal quality into the first mixer. Every thing else with today's technology
is down hill.
Bert Kehren
In a message dated 9/25/2011 5:32:31 A.M. Eastern Daylight Time,
rob...@delien.nl writes:
One other thing is
What about rotation of the earth?
Jim,
Correct, there is the Sagnac effect to account for when you travel
easterly or westerly with a portable cesium clock (or equivalently,
when you send E/M timing signals over wire, fiber, or up/down to
a satellite).
Typically the correction is built into
On Sun, Sep 25, 2011 at 10:07 AM, Magnus Danielson
mag...@rubidium.dyndns.org 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.
On 25/09/11 21:14, Javier Serrano wrote:
On Sun, Sep 25, 2011 at 10:07 AM, Magnus Danielson
mag...@rubidium.dyndns.org 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.
Hi:
The preliminary PTB report does not have info on what the waveforms look
like going into the SR620. It only implies that the trigger levels were
set at 1.0 volts.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
We still don't have the final PTB
javier.serrano.par...@gmail.com said:
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.
You can get a lot of good ideas from the radio astronomers. It's been
discussed here
On 9/25/11 3:26 PM, Hal Murray wrote:
javier.serrano.par...@gmail.com said:
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.
You can get a lot of good ideas from the radio
I may be a bit naive,
but how would physically carrying several caesium clocks
back and forth compare to these fibre optic methods?
cheers,
Neville Michie
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