The WLKE4-200-550-50-8000-1 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 200 / 550 MHz, Stopband Frequency Chosen Fco x 1.15 to 8 GHz, 3 dB Cutoff Frequency Choice of 200 to 550 MHz, Insertion Loss 0.6 to 1.1 dB, Rejection 50 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLKE4-200-550-50-8000-1 can be seen below.