The WTRCA6-400-500-0.1-0.7-40-3 from Wainwright Instruments is a Tunable Filter with Frequency 0.4 to 0.5 GHz, Tunable Frequency 100 MHz, Bandwidth 0.1 MHz, Rejection 40 dB, Insertion Loss 0.75 to 1.75 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCA6-400-500-0.1-0.7-40-3 can be seen below.