The WTRCT5-770-870-0.2-1.6-40-1 from Wainwright Instruments is a Tunable Filter with Frequency 0.77 to 0.87 GHz, Tunable Frequency 100 MHz, Bandwidth 0.2 MHz, Rejection 40 dB, Insertion Loss 0.5 to 2 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCT5-770-870-0.2-1.6-40-1 can be seen below.