A contribution for the improvement of GPS CV time transfer technique

Most of the GPS links between timing laboratories that contribute to TAI are performed by single channel GPS timing receivers. These are based in the original NBS and JPL designs, and can perform and store 48 tracks per day. We have increased the numbers of tracks per day using an external computer so reaching the maximum of 91 tracks. We are now able to follow the GPS schedule issued by BIPM and fill up all the gaps between tracks selecting additional satellites. In this paper we are exposing the studies done after an experience using a common clock link at our site and the results on the remote calibration of a time standard. It also contains a study of the impact of the increasing of the data per day in the uncertainty of the comparison using GPS CV technique. Finally, a comparison with a multi-channel GPS receiver is also detailed.