Activities at the State Time and Frequency Standard of Russia

A campaign on the State Time and Frequency Standard modernization is continuing. A second prototype of the primary Cs fountain standard with an uncertainty of 5 10(exp -16) is under assemblage and is scheduled to be ready by the end of 2011. Today, we have two new ensembles each of four H-masers of type CH1-75A with individual cavity auto-tuning systems. The whole instrumentation set includes distribution amplifiers, a frequency and time measuring system, and a real-time scale generation and distribution system. All these instruments are installed in thermally and humidity controlled chambers. As a result, the frequency stability of H-masers for a 1-day basis is about a few parts in 10(exp -16). The new remote clock comparison system consists of several multichannel dual-frequencys GLONASS/GPS TTS-3 receivers. A new GLONASS/GPS/GALILEO TTS-4 receiver is expected by the end of November. All TTS-3 receivers were differentially calibrated relative to BIPM's portable receiver last year. Just now, we have completed new measurements within a new calibration campaign arranged by the BIPM. Two TWSTFT stationary stations and a transportable one were tested in VNIIFTRI last summer. VNIIFTRI is ready to join the Europe-Asia link via the AM-2 satellite when it receives a radio license. During the last year, considerable changes have happened in the secondary laboratories in Khabarovsk and Petropavlovsk Kamchatsky. The paper delivers somewhat detailed information and some preliminary results. Presented at the Precise Time and Time Interval (PTTI) Systems and Applications Meeting (42nd) in Reston, Virginia on 15-18 Nov 2010 and published in proceedings of the same, p41-50. See also ADA547222, conference proceedings.The original document contains color images.