The PB1578XN-SF/SF-B from A1 Microwave is a Band Stop Filter with Stopband Frequency 1575.42 +/- 1 MHz, Insertion Loss 0.5 to 0.6 dB, Rejection 70 dB, Power 200 W, Return Loss 14 to 20 dB. Tags: Module with Connectors, Notch Filter. More details for PB1578XN-SF/SF-B can be seen below.