The RSF-173.130-133-7050-TR from Raltron is a Band Pass Filter with Frequency 173.0635 to 173.1965 MHz, Bandwidth 0.133 MHz, Center Frequency 173.130 MHz, Insertion Loss 2.6 to 3.6 dB, Rejection 52 to 45 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-173.130-133-7050-TR can be seen below.