The QLF-300-40 from Qualwave is a Low Pass RF Filter with Frequency DC to 0.3 GHz, Stopband Frequency 450 to 600 MHz, Insertion Loss 1 dB, Upper Rejection 40 dB @ 450 MHz, 60 dB @ 600 MHz, Power 10 W. Tags: Module with Connector. More details for QLF-300-40 can be seen below.