The WTRCFV8-3510-3910-20-40-50-1 from Wainwright Instruments is a Tunable Filter with Frequency 3.51 to 3.91 GHz, Tunable Frequency 400 MHz, Bandwidth 20 MHz, Rejection 50 dB, Insertion Loss 1.5 to 2.5 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCFV8-3510-3910-20-40-50-1 can be seen below.