The CB1720/20SK-B2 from G-WAY Microwave is a Band Pass Filter with Frequency 1710 to 1730 MHz, Bandwidth 20 MHz, Center Frequency 1720 MHz, Insertion Loss 1.6 dB, Rejection 6 to 100 dB. Tags: Module with Connectors, Cavity Filter. More details for CB1720/20SK-B2 can be seen below.