The QDDC-300-18000-30 from Qualwave is a Dual Directional Coupler with Coupling 20 to 30 dB, Coupling Variation ±1 dB, Frequency 300 to 18000 MHz, Average Power 30 W, Insertion Loss 1.7 to 1.8 dB. Tags: Module with Connectors. More details for QDDC-300-18000-30 can be seen below.