The AB1656B719 from Anatech Electronics is a Band Pass Filter with Frequency 1.64 to 1.66 GHz, Bandwidth 20 MHz, Center Frequency 1656.8 MHz, Insertion Loss 2.5 dB, Upper Rejection 50 dB @ 1736 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1656B719 can be seen below.