The 4011C-10 from Narda-MITEQ is a Directional Coupler with Frequency 500 MHz to 1 GHz, Coupling 10 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity ±0.75 dB, Directivity 25 dB. Tags: Module with Connectors. More details for 4011C-10 can be seen below.