The WTRCT20-1749.9-1879.9-10-14-30 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.75 to 1.88 GHz, Bandwidth 10 MHz, Insertion Loss 2.25 dB, Rejection 30 dB, Return Loss 14 dB. Tags: Module with Connectors, Cavity Filter, Notch Filter, Tunable Filter. More details for WTRCT20-1749.9-1879.9-10-14-30 can be seen below.