The RSF-836.500-25000-3030-TR-NS1 from Raltron is a Band Pass Filter with Frequency 0.824 to 0.849 GHz, Bandwidth 25 MHz, Center Frequency 836.500 MHz, Insertion Loss 3 dB, Rejection 30 to 40 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-836.500-25000-3030-TR-NS1 can be seen below.