First year results of the international comparison of UTC (CENAM)

The Centro Nacional de Metrologia (National Center of Metrology), CENAM, in Mexico, has been contributing to UTC since March 1996 with six HP5071A high performance frequency standards. The UTC(CENAM) (or UTC(CNM) as it is labeled in BIPM Circular T) is presently generated from a single HP5071A clock which is operated under controlled temperature and humidity conditions. In this report we present results of the first year (from March 96 to March 97) of international comparison of UTC(CENAM). We use the common-view time transfer technique and follow the BIPM schedule for North-West America to make that comparison through the BIPM. Analysing the BIPM Circular T CENAM´s data, we find the fractional frequency instability of our Master Clock to be about 2×10^-15 for an integration time (τ) of 81 days, and an intrinsic frequency offset of about 1,5×10^-13