The CSI-FLTR-7NF10-812.5/857.5 from Westell Technologies is a Band Pass Filter with Frequency 809 to 861 MHz, Bandwidth 52 MHz, Insertion Loss 2.0 dB, Power 10 W, Ripple 1.2 dB. Tags: Module with Connectors. More details for CSI-FLTR-7NF10-812.5/857.5 can be seen below.