The QDDC-6000-18000-30 from Qualwave is a Dual Directional Coupler with Coupling 10 to 30 dB, Coupling Variation ±0.7 dB, Frequency 6000 to 18000 MHz, Average Power 30 W, Insertion Loss 0.7 to 2 dB. Tags: Module with Connectors. More details for QDDC-6000-18000-30 can be seen below.