The SF1142B from Murata is a Band Pass Filter with Frequency 310.8 to 319.2 MHz, Bandwidth 4.2 MHz, Center Frequency 315 MHz, Insertion Loss 13 to 14 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, IF SAW Filter, Ceramic Filter. More details for SF1142B can be seen below.