Callisto spectrum measurement at Humain station ROB

During a measurement campaign in May 2006 spectrum measurements were done at Humain station in Belgium. Humain is part of the ROB (Royal Observatory of Belgium) located south of Brussels, capital of Belgium. Measurements were done with a broadband logarithmic periodic antenna connected to a Callisto spectrometer designed and built by ETH Zurich, see (Benz, Monstein and Meyer, 2005). This measurement campaign shall be the technical basis to decide how to continue concerning fixed frequency measurements and also spectroscopic measurements below 1GHz. The results are presented in total overviews as well as in form of a digital zoom on the most interesting frequencies ranges. An extreme difference in polarization was detected. While horizontal polarization leads to acceptable results, vertical polarization can not be used by Callisto spectrometer because the power level is too high and therefore produces cross modulation.