The RSF-1842.500-75000-1109-TR-NS3 from Raltron is a Band Pass Filter with Frequency 1805 to 1880 MHz, Bandwidth 75 MHz, Center Frequency 1842.5 MHz, Insertion Loss 1.6 to 2.5 dB, Rejection 50 to 5 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-1842.500-75000-1109-TR-NS3 can be seen below.