The WRCT8-919.5-921-923-924.5-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 921 to 923 MHz, Bandwidth 2 MHz, Insertion Loss 0.6 to 1.75 dB, Rejection 50 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT8-919.5-921-923-924.5-50 can be seen below.