The RMDU.1850-1990Nf from Response Microwave Inc is a RF Duplexer with Frequency 1850 to 1910 MHz(RX) / 1930 to 1990 MHz(TX), Band 1 1850 to 1910 MHz (RX), Band 2 1930 to 1990 MHz(TX), Power 50 W, Insertion Loss 1 dB. Tags: Module with Connectors. More details for RMDU.1850-1990Nf can be seen below.