The WLKE5-45-90-60-8000-1 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 45 / 90 MHz, Stopband Frequency Chosen Fco x 1.1 to 8 GHz, 3 dB Cutoff Frequency Choice of 45 to 90 MHz, Insertion Loss 1 to 2.3 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLKE5-45-90-60-8000-1 can be seen below.