The RSF-450.000-4000-3838-TR from Raltron is a Band Pass Filter with Frequency 445.4 to 454.6 MHz, Bandwidth 9.2 MHz, Center Frequency 450 MHz, Insertion Loss 2 to 3 dB, Rejection 70 to 55 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-450.000-4000-3838-TR can be seen below.