The C1-A75 from RD Microwaves is a Directional Coupler with Frequency 600 MHz to 4 GHz, Coupling 10 dB, Coupling Variation ±1.25 dB, Directivity 18 dB, Average Power 10 to 50 W. Tags: Module with Connectors. More details for C1-A75 can be seen below.