The SF1197B from Murata is a Band Pass Filter with Frequency 243.6 to 253.6 MHz, Bandwidth 5 MHz, Center Frequency 248.6 MHz, Insertion Loss 3 to 4 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, IF SAW Filter, Ceramic Filter. More details for SF1197B can be seen below.