The QDDC-20-3000-20-20-S from Qualwave is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±1.5 dB, Frequency 20 to 3000 MHz, Average Power 20 W, Insertion Loss 1.3 dB. Tags: Module with Connectors. More details for QDDC-20-3000-20-20-S can be seen below.