The HD31330 from HD Communications Corp is a Band Pass Filter with Frequency 314 to 316 MHz, Center Frequency 315 MHz, Insertion Loss 3 to 4 dB, Rejection 35 to 53 dB, Upper Rejection 35 to 45 dB @ 320MHz. Tags: Module with Connectors, RF SAW Filter. More details for HD31330 can be seen below.