The WRCT8-920-921.5-923.5-925-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 921.5 to 923.5 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 WRCT8-920-921.5-923.5-925-50 can be seen below.