The HDF948A from Shoulder Electronics is a Band Pass Filter with Frequency 945 to 952.5 MHz, Bandwidth 7.5 to 20 MHz, Center Frequency 948.75 MHz, Insertion Loss 3.8 dB, Ripple 1.0 to 2.0 dB. Tags: Surface Mount, RF SAW Filter. More details for HDF948A can be seen below.