The C17-0R512 from Marki Microwave is a Directional Coupler with Frequency 500 MHz to 12 GHz, Coupling 17.5 dB, Directivity 15 to 20 dB, Average Power 80 W, Insertion Loss 0.17 to 0.64 dB. Tags: Module with Connectors. More details for C17-0R512 can be seen below.