The 3043B-10 from Narda-MITEQ is a Directional Coupler with Frequency 1.7 to 4.2 GHz, Coupling 10 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.25 dB, Directivity 20 dB. Tags: Module with Connectors. More details for 3043B-10 can be seen below.