The AM778-748D317 from Anatech Electronics is a RF Duplexer with Frequency 740 to 756 MHz / 770 to 787 MHz, Band 1 740 to 756 MHz, Band 2 770 to 787 MHz, Power 2 W, Insertion Loss 2.8 dB. Tags: Surface Mount, Ceramic. More details for AM778-748D317 can be seen below.