The WTRCDB5-300-400-0.05-0.61-40-2 from Wainwright Instruments is a Tunable Filter with Frequency 0.3 to 0.4 GHz, Tunable Frequency 100 MHz, Bandwidth 0.05 MHz, Rejection 40 dB, Insertion Loss 1 to 3 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCDB5-300-400-0.05-0.61-40-2 can be seen below.