An experimental study of some fading characteristics of 10-cm waves in the scatter region

This paper is primarily concerned with the short-term rapid fading of 10-cm waves in the scatter region. For a 100-mile path over the Bristol Channel measured results of the fading rate and amplitude, together. with the correlation of the fading pattern of signals from the same source received by two spaced aerials are presented. The lack of correlation is illustrated by photographs of a particular type of c.r.t. presentation of the signals. Fading rates of the order of 1¿5 c / s over periods of a few minutes were measured, with amplitudes in excess of 25 db. Measured results of the amplitude of the slower mean-level fades which occur with periods of the order of an hour and greater are given from observations in the North Sea for the limited time of three weeks. In this time mean-level variations of 18 db were recorded during the winter of 1955.