The QDDC-6000-18000-K4 from Qualwave is a Dual Directional Coupler with Coupling 30 to 50 dB, Coupling Variation ±1 to ±1.2 dB, Frequency 6000 to 18000 MHz, Peak Power 3000 W, Average Power 400 W. Tags: Module with Connectors. More details for QDDC-6000-18000-K4 can be seen below.