The QDDC-10-512-K2 from Qualwave is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±1 dB, Frequency 10 to 512 MHz, Average Power 200 W, Insertion Loss 0.7 dB. Tags: Module with Connectors. More details for QDDC-10-512-K2 can be seen below.