[IGSSTATION-8176] OPMT00FRA: corrupted data due to 1 PPS distributor failure.

[Pierre Uhrich]

Dear IGS Colleagues,

Since mid-day yesterday, we are having a major failure on the 1 PPS distributor connected to OPMT receiver. OPMT is an old Astech Z12-T from a series which was built at the beginning of the geodetic activities in time and frequency metrology laboratories, from a design defined by University of Bern. Therefore, for consistent operation, and contrary to other Ashtech Z12-T types manufactured later, this unit requires a 1 PPS voltage slightly over the nowadays common 5 V TTL. This is why we cannot simply exchange the 1 PPS distributor, as the TTL level is not enough. We are trying to repair the failed unit, because there is no spare available, but with no guarantee today.

For the inclusion of UTC(OP) in the IGS computations, we recommend to use GNSS data from OP other station OP7100FRA only.

Best regards.
Pierre

Dr Pierre Uhrich

Ingénieur-Chercheur LNE		Pierre.Uhrich at obspm.fr

LNE-SYRTE	
Observatoire de Paris, Université PSL, CNRS, Sorbonne Université
61 avenue de l'Observatoire
75014 Paris
France

Tél.: + 33 (0)1 4051 2217
Fax.: + 33 (0)1 4325 5542
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