The C1-A83 from RD Microwaves is a Directional Coupler with Frequency 2 to 12.4 GHz, Coupling 30 dB, Coupling Variation ±1 to ±1.5 dB, Frequency Sensitivity 0.75 to 1 dB, Directivity 15 to 20 dB. Tags: Module with Connectors. More details for C1-A83 can be seen below.