Abstract
From a conceptual point of view water vapour radiometers (WVRs) are ideal instruments for a direct determination of the water vapour content in the atmosphere above a space geodetic observing site. For various reasons the application of WVRs for a direct correction of geodetic Very Long Baseline Interferometry (VLBI) observations for the wet component of atmospheric refraction has not been brought to a stage where it could be employed routinely. The installation of a new type of WVR at the 100 m Effelsberg radio telescope in Germany opens up new possibilities for a direct correction of the VLBI observations using line-of-sight WVR observations. The WVR has been in operation during two geodetic VLBI sessions of a purely European network. In addition, some WVR data at Onsala have been revisited to embark on a project which aims at applying wet delay corrections from WVRs to VLBI sessions of the European geodetic VLBI network for the Effelsberg, Madrid, Onsala and Wettzell sites.
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