The AB1987B483 from Anatech Electronics is a Band Pass Filter with Frequency 1.98 to 2 GHz, Bandwidth 25 MHz, Center Frequency 1987.5 MHz, Insertion Loss 3.5 dB, Lower Rejection 55 dB @ 1920-1965 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1987B483 can be seen below.