The L12F-HR from GPS Source is a Band Pass Filter with Frequency 1.20 to 1.59 GHz, Center Frequency 1227.6 MHz / 1575.4 MHz, Insertion Loss 4 to 6 dB, Upper Rejection 35 dB, Lower Rejection 16 to 20 dB. Tags: Module with Connectors. More details for L12F-HR can be seen below.