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We report on r.f. measurements of the surface impedance Zs=Rs+iXs of Nb/sub 3/Sn superconducting films deposited on sapphire by planar magnetron sputtering. The measurements are performed by a microstrip resonator technique using a meander line geometry. The power dependence of Zs is studied at different temperatures and frequencies in the range 1-18 GHz. The effects of a d.c. magnetic field applied with different orientations is also studied. The data are analyzed in the context of different models.