The QDDC-200-400-1K-40-NS from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 200 to 400 MHz, Average Power 1000 W, Insertion Loss 0.2 dB. Tags: Module with Connectors. More details for QDDC-200-400-1K-40-NS can be seen below.