The AB1643B740 from Anatech Electronics is a Band Pass Filter with Frequency 1.63 to 1.66 GHz, Bandwidth 34 MHz, Center Frequency 1643.5 MHz, Insertion Loss 2.5 dB, Upper Rejection 45 dB @ 1669.5 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1643B740 can be seen below.