The WRCT40-1853.9-1854.9-1869.9-1870.9-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8549 to 1.8699 GHz, Bandwidth 15 MHz, Insertion Loss 3.5 to 6 dB, Rejection 50 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT40-1853.9-1854.9-1869.9-1870.9-50 can be seen below.