The AB824B971 from Anatech Electronics is a Band Pass Filter with Frequency 821.5 to 826.5 MHz, Bandwidth 5 MHz, Center Frequency 824 MHz, Insertion Loss 1.7 dB, Lower Rejection 75 dB @ Fc +/- 10 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB824B971 can be seen below.