The RSF-173.225-134-7050-TR-49 from Raltron is a Band Pass Filter with Frequency 173.158 to 173.292 MHz, Bandwidth 0.134 MHz, Center Frequency 173.225 MHz, Insertion Loss 3 to 3.6 dB, Rejection 54 to 45 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-173.225-134-7050-TR-49 can be seen below.