2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2620We monitored 3C273 with VLBI at 15-86 GHz since 1990. We discuss component trajectories, opacity effects at the jet base, a rotating and perhaps precessing jet, and outburst-ejection relations from Gamma-ray to radio bands.6 pages, 8 figures, appeared in: Proceedings of the 5th European VLBI Network Symposium held at Onsala Space Observatory, June 29-July 1, 2000, eds. J.E. Conway, A.G. Polatidis, R.S. Booth, and Y.M. Pihlstrom, p. 25-30. (ISBN 91-631-0548-9)Astrophysicstext