The WLJ4-35-75-60-3000-100 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 35 / 75 MHz, Stopband Frequency Chosen Fco x 1.95 to 3 GHz, 3 dB Cutoff Frequency Choice of 35 to 75 MHz, Insertion Loss 0.45 to 0.6 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ4-35-75-60-3000-100 can be seen below.