The QDDC-40-300-10-10-S from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±1 dB, Frequency 40 to 300 MHz, Peak Power 10 KW, Average Power 10 W. Tags: Module with Connectors. More details for QDDC-40-300-10-10-S can be seen below.