A New Type of Automatic Radio Direction Finder

A system of automatic radio direction finding is described that operates on the principle of effectively converting the radio-frequency currents developed in two low-impedance loops into direct currents of proportional amplitude and having the same relative polarity as the instantaneous values of the radio-frequency currents developed. By utilizing the two fixed loops in space quadrature, direct currents are obtained which can be applied to an indicating meter or cathode-ray tube in such a manner as to give a continuous visual indication of the angle, in the horizontal plane, at which an incident wave is striking the loop assembly.