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 ...

independent of the direction of propagation of the waves and thus produce relatively different effects for the two directions of transmission.

For example, the radio emission from a quasar would span most of the diagram above and the amount of power would change very slowly over the frequency range. As mentioned above, hydrogen and hydroxyl ...

The diagram shows that when water waves are reflected their direction ... Diffraction affects radio and television signals. Long wave radio signals are much less affected by buildings, hills ...

Over the past decade, scientists have detected a puzzling phenomenon: radio pulses coming from within our Milky Way galaxy that would pulse every two hours, like a cosmic heartbeat.

The classic crystal radio was an oatmeal box with some wire and a few parts. [Michael Simpson] has something very different. He found an assembled Philmore “selective” radio kit. The simple ...

He designed a transmitter to send and a receiver to detect radio waves. By the end of the century Marconi had managed to send signals over several miles with no wires, and the idea was taking hold ...