The WLJ8-40-45-40-3000-100 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 40 / 45 MHz, Stopband Frequency Chosen Fco x 1.16 to 3 GHz, 3 dB Cutoff Frequency Choice of 40 to 45 MHz, Insertion Loss 0.9 to 1.35 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJ8-40-45-40-3000-100 can be seen below.