The RSF-1842.500-75000-3030-TR-NS1 from Raltron is a Band Pass Filter with Frequency 1.805 to 1.80 GHz, Bandwidth 75 MHz, Center Frequency 1842.5 MHz, Insertion Loss 2.5 to 4 dB, Rejection 30 to 10 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-1842.500-75000-3030-TR-NS1 can be seen below.