The AB1820B818 from Anatech Electronics is a Band Pass Filter with Frequency 1820 MHz, Center Frequency 1820 MHz, Insertion Loss 4 dB, Upper Rejection 50 dB @ 1845-6000 MHz, Lower Rejection 50 dB @ DC-1295 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1820B818 can be seen below.