The QDDC-500-6000-K3 from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 500 to 6000 MHz, Average Power 300 W, Insertion Loss 0.2 to 0.5 dB. Tags: Module with Connectors. More details for QDDC-500-6000-K3 can be seen below.