The HDF746A2 from Shoulder Electronics is a Band Pass Filter with Frequency 742 to 750 MHz, Center Frequency 746 MHz, Insertion Loss 2.3 dB, Ripple 1.0 to 2.0 dB, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, RF SAW Filter. More details for HDF746A2 can be seen below.