The RSF-451.500-3000-13365-TR from Raltron is a Band Pass Filter with Frequency 450 to 453 MHz, Bandwidth 3 MHz, Center Frequency 451.5 MHz, Insertion Loss 15 to 17 dB, Rejection 40 to 48 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-451.500-3000-13365-TR can be seen below.