[IGSSTATION-4098] OPMT: change of reference clock

[Pierre Uhrich]

Author: Pierre Uhrich (LNE-SYRTE, Observatoire de Paris)

Dear Colleagues,

Due to hardware maintenance activities to be conducted on the H-Maser 
used as local oscillator for OPMT IGS station, we have performed a 
change of reference clock on DOY 300, MJD 55496, Wednesday October 27 
2010. The new reference clock is still an H-Maser, but old enough to 
exhibit more noise compared to the former one. It is expected that after 
a given period of time depending on that maintenance activity we might 
go back to the former H-Maser in a few months from here.

We nevertheless advise potential users that OPMT data files might be 
corrupted for DOY 300 and 301. In average, OPMT data might exhibit today 
a small offset of about 1 ns with respect to the former situation, which 
stays consistent with usual delay calibration uncertainties.

A new logfile for OPMT is joined to that email.

Please feel free to contact us in the case more detailed information 
would be needed.
Best regards.
Pierre Uhrich.

-- 
===============================================================
Dr Pierre Uhrich			Pierre.Uhrich at obspm.fr
Ingénieur-chercheur LNE
Equipe Métrologie du temps
LNE-SYRTE,			Phone:	+ 33 (0)1 40 51 22 17
UMR CNRS 8630,			Fax:	+ 33 (0)1 43 25 55 42
Observatoire de Paris,
61 avenue de l'Observatoire, F-75014 Paris, France.
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