The 4C9-1732.5-X45N11 from Reactel is a Band Pass Filter with Frequency 1.71 to 1.76 GHz, Bandwidth 45 MHz, Center Frequency 1732.5 MHz, Insertion Loss 0.5 dB @ Passband, Rejection 65 dB @ 869 - 895 MHz 65 dB @ 1930 - 1990 MHz. Tags: Module with Connectors. More details for 4C9-1732.5-X45N11 can be seen below.