The QDDC-20-1000-K2-50-S from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±1 dB, Frequency 20 to 1000 MHz, Average Power 200 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for QDDC-20-1000-K2-50-S can be seen below.