The WLJE4-4-7.5-40-8000-0.01 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 4 / 7.5 MHz, Stopband Frequency Chosen Fco x 1.08 to 8 GHz, 3 dB Cutoff Frequency Choice of 4 to 7.5 MHz, Insertion Loss 0.8 to 1.7 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJE4-4-7.5-40-8000-0.01 can be seen below.