The WBCTB3-828-836.5-839.5-848-30 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 1.25 to 1.5 dB, Rejection 30 dB. Tags: Module with Connectors, Cavity Filter. More details for WBCTB3-828-836.5-839.5-848-30 can be seen below.