The effectiveness of a recoil separator for the measurement of radiative capture reactions at radioactive ion beam facilities has been examined. A system consisting of velocity, energy, and momentum filters was tested with the 1H( 12C, 13N)γ reaction at the Ecm = 422 keV resonance; excitation functions obtained with both the 13N recoils and the capture gamma rays were compared. Projectile 12C fluxes were measured directly with Faraday cups and indirectly with Rutherford backscattering into silicon detectors, while the 13N recoil flux was measured directly with silicon detectors and indirectly by its residual radioactivity. A suppression of the 12C beam particles by a factor of 10 -10 was observed when the system was tuned for the recoil 13N's. Possible improvements of the system are discussed.