The shortwave frequencies have to be altered regularly because of varying physical propagation conditions. Unlike FM, medium and long wave frequencies, shortwave frequencies have to be changed ...

Radio transmission in the 1.7-30 MHz frequency range worldwide. Like AM radio, shortwave signals reflect back from the ionosphere and follow the curvature of the earth. As a result, shortwave (SW ...

Many Public Radio stations ... are now no direct BBC short-wave transmissions for North America, but in some parts of the region it may be possible to receive frequencies intended for West Africa ...

A QSL Card from Radio Moscow probably got many 14-year-olds on government watch lists. (Public domain) Between World War II and Y2K, shortwave ... exist as streaming stations or a mix of radio ...

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 UK has successfully tested the Radio Frequency Directed Energy Weapon (RFDEW) system for the first time. It can destroy drones using radio frequency waves, according to the press service of ...