For about one year the time scales UTC (OCA) and UTC (TUG) were compared by means of GPS common-view and two-way satellite time transfer. At the end of the experiment, both links were independently "calibrated" by measuring the differential delays of the GPS receivers and the satellite Earth stations by transportation of one GPS receiver and one satellite terminal to the other site. The results obtained by the two methods differ by about 3 ns, but reveal a seasonal variation of about 8 ns which, most likely, is mainly the result of temperature-dependent delays in the GPS receiving equipment used.
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