The SF3030AO-1037.5MHz-A from Dynamic Engineers is a Band Pass Filter with Frequency 1025 to 1050 MHz, Bandwidth 25 MHz, Center Frequency 1037.5 MHz, Insertion Loss 2.5 to 3.5 dB, Rejection 30 to 52 dB. Tags: Surface Mount, RF SAW Filter. More details for SF3030AO-1037.5MHz-A can be seen below.