The KDK-20-225 from Synergy Microwave Corporation is a Directional Coupler with Frequency 225 to 400 MHz, Coupling 20 dB, Coupling Variation ±0.5 dB (Flatness), Directivity 18 to 25 dB, Average Power 50 W. Tags: Module with Connectors. More details for KDK-20-225 can be seen below.