The WTRCA6-400-500-5-18-40-9 from Wainwright Instruments is a Tunable Filter with Frequency 0.4 to 0.5 GHz, Tunable Frequency 100 MHz, Bandwidth 5 MHz, Rejection 40 dB, Insertion Loss 0.6 to 0.75 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCA6-400-500-5-18-40-9 can be seen below.