The WRCT40-1729-1730-1750-1751-50-2 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.73 to 1.75 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 WRCT40-1729-1730-1750-1751-50-2 can be seen below.