## page was renamed from LCGT/subgroup/ifo/digital/Timing
= KAGRA Timing System =

----

== Web monitor ==
https://gwdet.icrr.u-tokyo.ac.jp/~controls/GPS/

== Note of the Meeting with Zsuzsa (Jul 15, 2016 at Columbia University) ==


=== Suggestions (random order) ===
 * You may not want more IRIG-B boards because there is Dsub output on the back of IRIG-B board with which we can convert to BNC to use more outputs.
 * It's better to connect two GPS antennas to Master board so that one can be used when the other signal is lost.
 * In the master board, VCXO is not available in the market anymore. However Szusza has spares.
 * In the comparator board, there is one chip which gets very hot. Make sure to cool it down. 
 * Check if the leap second is correctly compensated in the oldest IRIG-B (one arrived on 5/7/2012, installed in the front room). iKAGRA timing might have been off 1 sec!

[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5386|our note related to the new order]]

== Reference ==
==== LIGO Documents ====
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=483|Timing System Document Map Advanced LIGO]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=485|Quick Start Guide Optical Timing Distribution System Advanced LIGO]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=492|Timing Master Module/Fanout Module]]
  * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=21665|Circuit Schematic]]
 * [[https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=493|Slave Module]]


==== KAGRA Documents ====
 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8030|How To Use Common View]]