The RSF-173.225-135-7050-TR from Raltron is a Band Pass Filter with Frequency 173.1575 to 173.2925 MHz, Bandwidth 0.135 MHz, Center Frequency 173.225 MHz, Insertion Loss 3.6 dB, Rejection 45 to 50 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-173.225-135-7050-TR can be seen below.