The QDDC-500-18000-30-10-S from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±0.7 dB, Frequency 500 to 18000 MHz, Average Power 30 W, Insertion Loss 3.3 dB. Tags: Module with Connectors. More details for QDDC-500-18000-30-10-S can be seen below.