The WRCT40-1739-1740-1755-1756-50-1 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.74 to 1.755 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 WRCT40-1739-1740-1755-1756-50-1 can be seen below.