The WRCT8-817.5-821.5-831.5-835.5-40-2 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 821.5 to 831.5 MHz, Bandwidth 10 MHz, Insertion Loss 0.6 to 1 dB, Rejection 40 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT8-817.5-821.5-831.5-835.5-40-2 can be seen below.