The WBCDB3-837.3-852.5-855.5-870.7-50 from Wainwright Instruments is a Band Pass Filter with Frequency 852.5 to 855.5 MHz, Bandwidth 3 MHz, Center Frequency 854 MHz, Insertion Loss 1 to 1.25 dB, Rejection 50 dB. Tags: Module with Connectors, Cavity Filter. More details for WBCDB3-837.3-852.5-855.5-870.7-50 can be seen below.