The RFDC3M5M30 from RF-Lambda is a Directional Coupler with Frequency 300 to 500 MHz, Coupling 30 dB, Frequency Sensitivity ±0.5 to ±8 dB, Directivity 20 to 22 dB, Average Power 300 W. Tags: Module with Connectors. More details for RFDC3M5M30 can be seen below.