The QDDC-940-1900-50-20-S from Qualwave is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±1 dB, Frequency 940 to 1900 MHz, Peak Power 500 W, Average Power 50 W. Tags: Module with Connectors. More details for QDDC-940-1900-50-20-S can be seen below.