The WTRCT5-870-970-0.2-1.6-50-4 from Wainwright Instruments is a Tunable Filter with Frequency 0.87 to 0.97 GHz, Bandwidth 0.2 MHz, Rejection 50 dB, Insertion Loss 0.5 to 2.5 dB, Operating Temperature 15 to 45 Degrees C. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCT5-870-970-0.2-1.6-50-4 can be seen below.