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 ...
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 ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results