The AB1687B464 from Anatech Electronics is a Band Pass Filter with Frequency 1.63 to 1.75 GHz, Bandwidth 125 MHz, Center Frequency 1687.5 MHz, Insertion Loss 1.0 dB, Upper Rejection 25 dB @ 1900-2050 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1687B464 can be seen below.