The WLF10-100-200-40-1000-1000 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 100 / 200 MHz, Stopband Frequency Chosen Fco x 1.16 to 1 GHz, 3 dB Cutoff Frequency Choice of 100 to 200 MHz, Insertion Loss 0.3 to 0.4 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLF10-100-200-40-1000-1000 can be seen below.