The QDDC-2000-2800-K3-40-NS from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 2000 to 2800 MHz, Average Power 300 W, Insertion Loss 0.25 dB. Tags: Module with Connectors. More details for QDDC-2000-2800-K3-40-NS can be seen below.