The LC9S-300M-50-1765A from TTE Filters is a Low Pass RF Filter with Frequency DC to 300 MHz, Stopband Frequency 450 to 600 MHz, Insertion Loss 1 dB, Rejection -40 to -60 dBc, Power 10 W. Tags: Module with Connector, Chebyshev Filter. More details for LC9S-300M-50-1765A can be seen below.