The FN-1994W from Filtronetics is a Low Pass RF Filter with Frequency DC to 400 MHz, Stopband Frequency 580 MHz to 1.2 GHz, 3 dB Cutoff Frequency 400 MHz, Insertion Loss 0.2 dB, Rejection 20 to 40 dB. Tags: Module with Connector. More details for FN-1994W can be seen below.