The 4C9-731-X6N11 from Reactel is a Band Pass Filter with Frequency 728 to 734 MHz, Bandwidth 6 MHz, Center Frequency 731 MHz, Insertion Loss 1.0 dB @ Passband, Rejection 60 dB @ DC - 704 MHz 60 dB @ 776 - 894 MHz. Tags: Module with Connectors. More details for 4C9-731-X6N11 can be seen below.