The WLJE4-25-30-60-8000-1 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 25 / 30 MHz, Stopband Frequency Chosen Fco x 1.24 to 8 GHz, 3 dB Cutoff Frequency Choice of 25 to 30 MHz, Insertion Loss 1 to 1.5 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLJE4-25-30-60-8000-1 can be seen below.