The QDDC-80-520-2K-50-7S from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±1 dB, Frequency 80 to 520 MHz, Average Power 2000 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for QDDC-80-520-2K-50-7S can be seen below.