The FN-3699W from Filtronetics is a Low Pass RF Filter with Frequency DC to 150 MHz, Stopband Frequency DC to 150 MHz, 3 dB Cutoff Frequency 150 MHz, Insertion Loss 0.5 dB, Rejection 15 to 55 dBc. Tags: Module with Connector. More details for FN-3699W can be seen below.