The AD491-481D331 from Anatech Electronics is a RF Duplexer with Frequency 489 to 493.480 MHz / 479 to 483.48 MHz, Band 1 489 to 493.480 MHz, Band 2 479 to 483.48 MHz, Power 60 W, Insertion Loss 2 to 2.5 dB. Tags: Module with Connectors. More details for AD491-481D331 can be seen below.