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The F-GAMMA-project is the coordinated effort of several observatories tounderstand the AGN phenomenon and specifically blazars via multi-frequencymonitoring in collaboration with the {\sl Fermi}-GST satellite since January2007. The core observatories are: the Effelsberg 100-m, the IRAM 30-m and theOVRO 40-m telescope covering the range between 2.6 and 270 GHz. Effelsberg andIRAM stations do a monthly monitoring of the cm to sub-mm radio spectra of 60selected blazars whereas the OVRO telescope is observing roughly 1200 objectsat 15 GHz with a dense sampling of 2 points per week. The calibrationuncertainty even at high frequencies, is of a few percent. 47% of theEffelsberg/Pico Veleta sample is included in the LBAS list. An update of themonitored sample is currently underway.

AGN astrophysics via multi-frequency monitoring of gamma-ray blazars in the Fermi-GST era