The AM307-343D1160 from Anatech Electronics is a RF Duplexer with Frequency 305 to 310 MHz / 341 to 346 MHz, Band 1 305 to 310 MHz, Band 2 341 to 346 MHz, Power 1 W, Insertion Loss 3.5 to 4 dB. Tags: Surface Mount, Ceramic. More details for AM307-343D1160 can be seen below.