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Torben Schüler
Type of contribution: oral

Results from the TWIN Commissioning Phase

Torben Schüler, Geodetic Observatory Wettzell Gerhard Kronschnabl, Geodetic Observatory Wettzell Alexander Neidhardt, Technical University of Munich Christian Plötz, Geodetic Observatory Wettzell Alessandra Bertarini, University of Bonn/MPIfR Laura La Porta, University of Bonn/MPIfR Simone Bernhart, University of Bonn/MPIfR Arno Müskens, University of Bonn/MPIfR

The TWIN radio telescope pair at the Geodetic Observatory Wettzell features two identical antenna constructions reserved for geodetic VLBI within the International VLBI Service for Geodesy and Astrometry with slightly different receiving systems. The first telescope, TTW1, owns a tri-band feed horn in S-, X- and Ka-band with dual-polarization capabilities and a particularly broad usable X-band window from 6 to 10 GHz. This system entered its commissioning phase in 2014. First results are being presented here. The positioning performance evaluated over the 120 meters baseline between TTW1 and the existing 20 m RTW telescope is very satisfactory in X-band, whilst S-band suffers from increased radio frequency interference and likely requires additional measures to be taken. Corresponding correlation samples will be presented. Moreover, the status of the second telescope, TTW2, will be portrayed. A broadband feed (“Eleven-Feed” from 2 to 12 GHz) was successfully developed and delivered by the manufacturer to the Observatory. The results from a first quality analysis will be discussed. In summary, these results indicate a very suitable performance for this VGOS antenna. The integration of the feed is scheduled for mid of this year after the necessary, although unexpected, modifications of the feed cone have been completed.