The QDDC-100-3000-K25-45-S from Qualwave is a Dual Directional Coupler with Coupling 45 dB, Coupling Variation ±2 dB, Frequency 100 to 3000 MHz, Average Power 250 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for QDDC-100-3000-K25-45-S can be seen below.