The 4017C-10 from Narda-MITEQ is a Directional Coupler with Frequency 18 to 26.5 GHz, Coupling 10 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.75 dB, Directivity 12 dB. Tags: Module with Connectors. More details for 4017C-10 can be seen below.