The RSF-137.500-1000-7050-TR from Raltron is a Band Pass Filter with Frequency 136.6 to 138.4 MHz, Bandwidth 1.8 MHz, Center Frequency 137.5 MHz, Insertion Loss 2.0 to 3.5 dB, Rejection 52 to 20 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-137.500-1000-7050-TR can be seen below.