The CB1748/77SK-D1 from G-WAY Microwave is a Band Pass Filter with Frequency 1709 to 1786 MHz, Bandwidth 77 MHz, Center Frequency 1747.5 MHz, Insertion Loss 0.5 to 0.8 dB, Rejection 40 to 70 dB. Tags: Module with Connectors, Cavity Filter. More details for CB1748/77SK-D1 can be seen below.