The QDDC-10-100-3K5-50-7S from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±0.5 dB, Frequency 10 to 100 MHz, Average Power 3500 W, Insertion Loss 0.2 dB. Tags: Module with Connectors. More details for QDDC-10-100-3K5-50-7S can be seen below.