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Systematic error sources are of great concern in space geodesy.Subtle in nature,they are currently limiting the performance of all the major techniques,GNSS,VLB and SLR.Co-locations of these techniques on fundamental stations provide the chance to identify such systematic errors.In order to provide a better tie between GNSS,SLR and VLBI we have designed and implemented a fully calibrated receiver unit that allows GNSS observations with the 20m RTW in Wettzell.