The QDDC-500-3000-K1-50-S from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±1.2 dB, Frequency 500 to 3000 MHz, Average Power 100 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-500-3000-K1-50-S can be seen below.