The QDDC-0.8-30-K5-40-NS from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 0.8 to 30 MHz, Average Power 500 W, Insertion Loss 0.1 dB. Tags: Module with Connectors. More details for QDDC-0.8-30-K5-40-NS can be seen below.