AM waves, which have a lower frequency, are attenuated when they are refracted from the ionosphere or the Earth’s surface, resulting in shorter travel distances than shortwaves. Shortwave radio ...

The Buzzer, also known as UVB-76 or UZB-76, has been a constant companion to anyone with a shortwave radio tuned to 4625 ... are that the buzzing studies the ionosphere or that it is part of ...

For example, radio waves are transmitted by walls - this explains why these signals can be detected by radios inside a person’s house. However, visible light rays are absorbed by walls ...