The 317 from Microwave Devices Inc. is a Directional Coupler with Frequency 150 MHz to 8 GHz, Coupling 50 dB, Amplitude Flatness ±1.0 dB, Directivity 20 to 25 dB, Average Power 1 to 80000 W. Tags: Module with Connectors. More details for 317 can be seen below.