The WRCT40-1803.9-1804.9-1824.9-1825.9-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8049 to 1.8249 GHz, Bandwidth 20 MHz, Insertion Loss 3.5 to 6.5 dB, Rejection 50 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT40-1803.9-1804.9-1824.9-1825.9-50 can be seen below.