The 6R6-1575.42-X50S12 from Reactel is a Band Stop Filter with Stopband Frequency 1.57442 to 1.57642 GHz, Insertion Loss 3.5 dB, Rejection 60 dB, Operating_Temperature -20 to 70 Degree C. Tags: Module with Connectors, Notch Filter. More details for 6R6-1575.42-X50S12 can be seen below.