  The results of VLBI observations of the quasar 3C273, obtained during a
multi-frequency campaign in late 1992 in the radio, millimeter and X-ray bands
are presented and discussed. The VLBI observations were made at 22 GHz with a
Global Array and at 43 GHz with the Very Long Baseline Array. Hybrid maps and
modelfits were made in order to look for any short time scale structural
variations of the inner part of the radio jet. In 42 days 3C273 was observed 5
times at roughly 10 day intervals. The jet structure did not show dramatic
changes in that period. However, we were able to follow the changes in the
positions of the components along the first 2 mas of the jet with respect to
the core. The resolution achieved by these observations allows the
decomposition of the apparent velocity vector of each component into two
orthogonal directions. We find evidence of reverse motion for a component along
the jet. The jet starts wiggling well inside the first parsec from the core.
The spatial period of the quasi-sinusoidal oscillating jet path about the jet
major axis was derived for distances between 2 and 8 mas from the core.
