The WTRCDB5-390-490-0.05-0.61-40 from Wainwright Instruments is a Tunable Filter with Frequency 0.39 to 0.49 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 WTRCDB5-390-490-0.05-0.61-40 can be seen below.