The DC1800U10-123 from Yantel Corporation is a Directional Coupler with Frequency 1.7 to 2.2 GHz, Coupling 9.5 to 10.7 dB, Directivity 20 to 24 dB, Average Power 4 W, Insertion Loss 0.25 to 0.29 dB. Tags: Surface Mount. More details for DC1800U10-123 can be seen below.