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We have developed a correlation radiometer at 33 GHz devoted to the searchfor residual polarization of the Cosmic Microwave Background (CMB). The twoinstruments`s outputs are linear combination of two Stokes Parameters (Q and Uor U and V). The instrument is therefore directly sensitive to the polarizedcomponent of the radiation (respectively linear and circular). The radiometerhas a beam-width oif 7 or 14 deg, but it can be coupled to a telescopeincreasing the resolution. The expected CMB polarization is at most a part permilion. The polarimeter has been designed to be sensitive to this faint signal,and it has been optimized to improve its long term stability, observing fromthe ground. In this contribution the performances of the instrument arepresented, together with the preliminary test and observations.Comment: 12 pages, 6 figures, in print on the Proc. SPIE Conf. - August 200

Dual output polarimeter devoted to the study of the Cosmic Microwave Background