The RSF-422.000-4000-3030-TR from Raltron is a Band Pass Filter with Frequency 420 to 424 MHz, Bandwidth 4000 kHz, Center Frequency 422 MHz, Insertion Loss 2.9 dB, Rejection 35 to 60 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-422.000-4000-3030-TR can be seen below.