The QDDC-6000-18000-K25-40-NS-1 from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 6000 to 18000 MHz, Average Power 250 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-6000-18000-K25-40-NS-1 can be seen below.