An Inverted VOR of Small Aperture

A new type of omnirange very-high-frequency omnidirectional radio (VOR), intended to be compatible with existing receivers, is described. It is ``inverted´´ in the sense that reference phase is transmitted by AM, as in the Doppler VOR (DVOR). Variable phase is radiated as a rotating square-wave FM field, the radiating elements being concentric loop antennas with circumferences equal to integer numbers of wave-lengths. Each loop radiates one term in the Fourier expansion of the variable phase field.