The 27001A from Narda-MITEQ is a Directional Coupler with Frequency 6 to 18 GHz, Coupling 30 to 50 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.7 dB, Directivity 10 to 12 dB. Tags: Module with Connectors. More details for 27001A can be seen below.