WorldDAB, the group advocates for DAB digital radio, has announced product certification for its new emergency alerting ...

AMONG the facts to be explained in a satisfactory theory of the propagation of radio waves over the earth's surface are the curvature of the rays in transmission between stations far apart ...

The effects are mostly related to the propagation of radio waves via the ionosphere. In the 1700s, who would care? In the mid 20th century, though, lots of things relied on this property of high ...

THE modified form of the ionic deflexion theory of wave propagation, discussed by Messrs. Nichols and Schelling (NATURE, March 7, vol. 115, p. 334), appears to have been suggested in England and ...