The HDF315.12M1 from Shoulder Electronics is a Band Pass Filter with Frequency 314.8 to 315.4 MHz, Bandwidth 0.63 MHz, Center Frequency 315.12 MHz, Insertion Loss 3.3 dB, Ripple 0.6 to 1.5 dB. Tags: Surface Mount, RF SAW Filter. More details for HDF315.12M1 can be seen below.