The QDDC-4000-6000-60-30-S from Qualwave is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±1.5 dB, Frequency 4000 to 6000 MHz, Average Power 60 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for QDDC-4000-6000-60-30-S can be seen below.