The C1-A61 from RD Microwaves is a Directional Coupler with Frequency 400 MHz to 2.9 GHz, Coupling 6 dB, Coupling Variation ±0.75 to ±2.5 dB, Directivity 20 dB, Average Power 5 to 100 W. Tags: Module with Connectors. More details for C1-A61 can be seen below.