The QDDC-850-1150-8K-50-A1N from Qualwave is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation ±0.5 dB, Frequency 850 to 1150 MHz, Average Power 8000 W, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for QDDC-850-1150-8K-50-A1N can be seen below.