What is a shortwave radio?

Short Radio is a type of long -range radio transmission that reflects signals from an atmosphere layer to be accepted in another part of the world. The shortwave radio spectrum is made of groups of frequencies between about 3 and 30 megahertz (MHz). The ionosphere, located about 100 miles (160 km) above the Earth's surface, has a unique ability to be able to reflect certain radio frequencies. Unlike AM and FM radio, shortwave radio frequencies can bounce off the ionosphere and be heard many thousands of kilometers away. This allows users to hear shortwave radio broadcasting from other countries around the world. The ionosphere usually reflects the widest diversity of shortwave radio frequencies at night, especially within hours of sunset and sunrise.

Unique's ability to travel short -wave radio transmissions has led to many uses. Radio broadcasting in almost every country on the wholeIt transmits the world to shortwave frequencies. Some famous broadcasting operators, such as The Voice of America in the US and the BBC in the UK, have broadcast messages in many languages, allowing listeners to hear messages that may not be broadcast at home. Other listeners preferred to learn more about some countries or picked up a new language through classes broadcast at some stations. The shortwave radio also attracted a number of fans who listen to the shortwave radio for fun. Many of them try to listen to stations in as many countries as possible.

Another use of a shortwave radio spectrum is amateur or "HAM" radio. Amateur radio fans transmit and receive messages from fans in other countries. Unlike shortwave radio listeners who listen only to stations amateur radio operators, they usually have to pass a license examination led by the government apostling according to certain rules to ensure the safety and proper use of the radio spectrum. Besides thatHo that they are a hobby, amateur radio operators regularly help in disasters if there are no other forms of communication.

On the market today, almost any budget on the market is on the market. Radia ranges from portable models powered from battery to desktop computers. The costs also differ from $ 100 to more than $ 1,000. More expensive models tend to have multiple features, including electronic displays and preset memory settings. While the typical telescopic antenna on the portable model is sufficient to accept many popular shortwave stations, some fans create more complicated antenna systems to accept weaker transmissions from the areas further.