The synchronization between atomic clocks
plays an important part in both radio astronomical
and geodetic Very Long Baseline Interferometry, as
the clocks are responsible for providing time and
frequency reference at radio stations. The availability
of highly stable optical fiber links from a few radio
observatories and their national metrological institutes
has recently allowed the streaming of frequencies from
optical clocks based on the Sr/Yb lattice technology
(even two order of magnitudes more stable than
H-maser clocks). We will present the current status of
the Italian Link for Frequency and Time (LIFT) and
the ongoing e orts to realize a geodetic experiment
utilizing the radio stations in Medicina and Matera
connected in common clock via the optical fiber link.
We will then show the results from the latest VLBI
clock timing experiments also making use of the LIFT
link to compare atomic clocks of the three italian radio
VLBI antennas (Mc, Sr and Nt) using the rms noise in
the interferometric phase. VLBI clock timing proves
more e ective than Global Navigation Satellite System
and less expensive than Two-Way Satellite Frequency
and Time Transfer in synchronizing remote clocks
