The QDDC-500-6000-K4-40-N from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±2 dB, Frequency 500 to 6000 MHz, Average Power 400 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-500-6000-K4-40-N can be seen below.