The RSF-183.640-80-5070-TR from Raltron is a Band Pass Filter with Frequency 183.56 to 183.71 MHz, Bandwidth 145 KHz, Center Frequency 183.64 MHz, Insertion Loss 2.8 to 4 dB, Rejection 28 to 50 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-183.640-80-5070-TR can be seen below.