The RSD-1950.000-2140.000-1814-TR-NS1 from Raltron is a RF Duplexer with Frequency 1920 to 1980 MHz / 2110 to 2170 MHz, Band 1 1920 to 1980 MHz, Band 2 2110 to 2170 MHz, Power 29 dBm, Insertion Loss 2.0 to 2.5 dB. Tags: Surface Mount. More details for RSD-1950.000-2140.000-1814-TR-NS1 can be seen below.