The 5CL1257D5-137-CD-SFF from Quantic PMI (Planar Monolithics) is a Band Pass Filter with Frequency 1.19 to 1.33 GHz, Bandwidth 137 MHz, Center Frequency 1257.5 MHz, Insertion Loss 0.5 dB, VSWR 1.50:1. Tags: Module with Connectors, Combline Filter. More details for 5CL1257D5-137-CD-SFF can be seen below.