The QDDC-0.009-100-3K5 from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±2 dB, Frequency 9 kHz to 100 MHz, Average Power 3500 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-0.009-100-3K5 can be seen below.