VLBI maps of 3C 273 and 3C 345 at 2.3 GHz

Maps of the quasars 3C 273 and 3C 345 made at 2.3 GHz with an eight station VLBI array are presented. Five compact components spanning 45 milli-arcsec are seen in 3C 273, and four are seen in 3C 345. Comparisons with maps at higher and lower frequencies show that in both sources the core, which dominates the high-frequency 'core-jet' structure, is strongly self-absorbed at 2.3 GHz and below. The jet components have flat spectra, peaking between 2 and 5 GHz. In both sources the VLBI jet curves toward the direction of the arcsecond-scale outer jet.