The MD12C1747/1842F75HCA from Vanlong is a RF Duplexer with Frequency 1.71 to 1.88 GHz, Band 1 1.71 to 1.785 GHz, Band 2 1.805 to 1.88 GHz, Insertion Loss 3.8 to 4.3 dB, Attenuation 45 to 50 dB. Tags: Surface Mount. More details for MD12C1747/1842F75HCA can be seen below.