The CB1828/45SK-E from G-WAY Microwave is a Band Pass Filter with Frequency 1805 to 1850 MHz, Bandwidth 45 MHz, Center Frequency 1827.5 MHz, Insertion Loss 0.5 dB, Rejection 60 to 70 dB. Tags: Module with Connectors, Cavity Filter. More details for CB1828/45SK-E can be seen below.