We describe the results of test observations obtained with a 5-m single-dish radiotelescope (RT5) using novel planar feeds designed to detect circularly polarized emission in the 1.5 -3.9 GHz band. The beam of such feeds is wide; nevertheless, solar scans have been successfully done using feeds at the focus of the primary mirror of the RT5. The sensitivity is about 1 sfu at each polarization and about 1.4 sfu at the I Stokes parameter. We estimate that it is possible to detect flares with fluxes above 5 sfu at the I Stokes parameter.
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