The RDXA-R1855-T1765A from Raltron is a RF Duplexer with Frequency 1.75 to 1.78 GHz / 1.84 to 1.87 GHz, Band 1 1.75 to 1.78 GHz, Band 2 1.84 to 1.87 GHz, Insertion Loss 1.7 to 2.5 dB, Attenuation 42 to 55 dB. Tags: Surface Mount. More details for RDXA-R1855-T1765A can be seen below.