The AM1600D803 from Anatech Electronics is a RF Duplexer with Frequency 1626.5 to 1660.5 MHz / 1525 to 1559 MHz, Band 1 1626.5 to 1660.5 MHz, Band 2 1525 to 1559 MHz, Power 5 W, Insertion Loss 0.9 dB. Tags: Surface Mount, Ceramic. More details for AM1600D803 can be seen below.