The WRCA12-917-917.5-921.5-922-30 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 917.5 to 921.5 MHz, Bandwidth 4 MHz, Insertion Loss 1.5 to 3 dB, Rejection 30 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCA12-917-917.5-921.5-922-30 can be seen below.