The SF3030AO-1438MHz-A from Dynamic Engineers is a Band Pass Filter with Frequency 1413 to 1463 MHz, Center Frequency 1438 MHz, Insertion Loss 4.2 to 5 dB, Upper Rejection 18 to 43 dB, Lower Rejection 20 to 46 dB. Tags: Surface Mount, RF SAW Filter. More details for SF3030AO-1438MHz-A can be seen below.