The WRCT40-1764.2-1765-1770-1770.8-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.765 to 1.77 GHz, Bandwidth 5 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 WRCT40-1764.2-1765-1770-1770.8-50 can be seen below.