This new block frequency down converter can extend 40 GHz ELINT systems to 70 GHz. It offers a cost effective solution to address a wide range of surveillance, ELINT, and ESM applications. The converter is offered in COTS and hermetic options. RF input 1 accepts 40 to 60 GHz with a band switch at 50 GHz; RF input 2 accepts 60 to 70 GHz. The single common IF output covers between 2.4 and 17.6 GHz.