In order to improve the quality of its time and frequency services, the Mex
ican Power Electric Company (via its Test on Equipment and Materials Labora
tory), requires trace-ability to Time and Frequency Mexican Primary Standar
ds. With this purpose, the common-view (CV) technique, using a TTR-6A GPS r
eceiver, has been implemented between LAPEM and the Time and Frequency Divi
sion of CENAM. In this paper ne present the results of this Mexican compari
son of time standards between these two national laboratories.