Direct-Ray Broadcast Transmission

The propagation of long and short waves over long distances has been extensively studied, and the underlying principles are, to a large extent, understood. The question of the propagation of medium waves by direct ray, which forms the subject of the following paper, has not previously received so much attention. The paper is written with a view of enabling predictions to be made as to the field strength of direct-ray transmission on wavelengths between 60 meters and 2000 meters. The main part of the paper is concerned with daylight transmission. The question of night transmission and the influence of the Heaviside layer is considered briefly at the end.