The RDUP-1850-1910M-1930-1990M-4313-3W-S-k from Raditek is a RF Duplexer with Frequency 1850 to 1910 MHz / 1930 to 1990 MHz, Band 1 1850 to 1910 MHz, Band 2 1930 to 1990 MHz, Power 3 W, Insertion Loss 3.2 dB. Tags: Surface Mount, Ceramic. More details for RDUP-1850-1910M-1930-1990M-4313-3W-S-k can be seen below.