The AB849B973 from Anatech Electronics is a Band Pass Filter with Frequency 846.5 to 851.5 MHz, Bandwidth 5 MHz, Center Frequency 849 MHz, Insertion Loss 1.7 dB, Lower Rejection 75 dB @ Fc +/- 10 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB849B973 can be seen below.