The WBCDB3-821.3-836.5-839.5-854.7-50 from Wainwright Instruments is a Band Pass Filter with Frequency 836.5 to 839.5 MHz, Bandwidth 3 MHz, Center Frequency 838 MHz, Insertion Loss 1 to 1.25 dB, Rejection 50 dB. Tags: Module with Connectors, Cavity Filter. More details for WBCDB3-821.3-836.5-839.5-854.7-50 can be seen below.