The CDS20-43-694/3800 from Radio Frequency Systems is a Directional Coupler with Frequency 694 MHz to 3.8 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Power 400 W, Average Power 400 W. Tags: Module with Connectors. More details for CDS20-43-694/3800 can be seen below.