The HDF922A1 from Shoulder Electronics is a Band Pass Filter with Frequency 919 to 926 MHz, Bandwidth 7 to 21.8 MHz, Center Frequency 922.5 MHz, Insertion Loss 3.2 dB, Power 0.01 to 0.03 W. Tags: Surface Mount, RF SAW Filter. More details for HDF922A1 can be seen below.