The WRCT5-917-919.5-921.5-924-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 919.5 to 921.5 MHz, Bandwidth 2 MHz, Insertion Loss 0.5 to 1.25 dB, Rejection 50 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT5-917-919.5-921.5-924-50 can be seen below.