The AM1030-1090D1043 from Anatech Electronics is a RF Duplexer with Frequency 1027 to 1033 MHz / 1087 to 1093 MHz, Band 1 1027 to 1033 MHz, Band 2 1087 to 1093 MHz, Power 3 W, Insertion Loss 1.2 dB. Tags: Surface Mount, Ceramic. More details for AM1030-1090D1043 can be seen below.