The WTRCT8-900-1000-0.2-1.6-50-4 from Wainwright Instruments is a Tunable Filter with Frequency 0.9 to 1 GHz, Tunable Frequency 100 MHz, Bandwidth 0.2 MHz, Rejection 50 dB, Insertion Loss 0.6 to 2 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCT8-900-1000-0.2-1.6-50-4 can be seen below.