Phase variations with range of the ground-wave signal from C.W. transmitters in the 70¿130 kc/s band

Curves of phase variation versus distance for homogeneous and smooth earth of various conductivities are calculated to K. Norton´s and H. Bremmer´s formulÿ. Confirmation of the curves is given by phase measurements within the reactive field of a C.W. radiator and along the base-line extensions of a Decca Navigator Chain. Further, a simple method of assessing the phase variation with distance in the case of inhomogeneous earth is suggested and illustrated by an analysis of readings on the Decca Navigator System.