The QDDC-300-2000-K1-40-S from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1.2 dB, Frequency 300 to 2000 MHz, Average Power 100 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for QDDC-300-2000-K1-40-S can be seen below.