The WLK3-185-230-60-3000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 185 / 230 MHz, Stopband Frequency Chosen Fco x 2.7 to 3 GHz, 3 dB Cutoff Frequency Choice of 185 to 230 MHz, Insertion Loss 0.4 to 0.5 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLK3-185-230-60-3000-20 can be seen below.