The AM461-451D1117 from Anatech Electronics is a RF Duplexer with Frequency 450 to 453 MHz / 460 to 463 MHz, Band 1 450 to 453 MHz, Band 2 460 to 463 MHz, Power 20 W, Insertion Loss 3.5 dB. Tags: Surface Mount, Ceramic. More details for AM461-451D1117 can be seen below.