The QDDC-0.009-100-K3-40-NS from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±0.5 dB, Frequency 9 kHz to 100 MHz, Average Power 300 W, Insertion Loss 0.25 dB. Tags: Module with Connectors. More details for QDDC-0.009-100-K3-40-NS can be seen below.