The HD31335 from HD Communications Corp is a Band Pass Filter with Frequency 1565 to 1585 MHz, Center Frequency 1575.42 MHz, Insertion Loss 1.8 to 2.5 dB, Rejection 45 to 50 dB, Upper Rejection 50 dB @ 1635 MHz. Tags: Module with Connectors, RF SAW Filter. More details for HD31335 can be seen below.