The AM229-251D1184 from Anatech Electronics is a RF Duplexer with Frequency 225.625 to 233.125 MHz / 248.125 to 255.625 MHz, Band 1 225.625 to 233.125 MHz, Band 2 248.125 to 255.625 MHz, Power 3 W, Insertion Loss 3.7 dB. Tags: Surface Mount, Ceramic. More details for AM229-251D1184 can be seen below.