Radio broadcasting has a long history; which goes beyond Tesla, Marconi and Armstrong, and it involves the development of communication and technology, as the radio magazine explains. Some of the most important dates of the radio past are on the AmericanRadioHistory.com website. Here are some of the earliest forms of radiotelegraphy systems.
It is a fact that the 1920s were an important date for radio telegraphic communication: at this time public radio broadcasting and early TV shows were also provided: scientists experimented with TVs in 1925, through broadcasting through channels, to an unreleased audience.
Early audio transmission on a moving AM broadcast radio station. In order to overcome AM radio interference problems, the stations began to use the FM radio in the 1930s as the band provided clearer sound in the air than radio waves from a transmitter to an antenna. Until the 2000s, Americans were introducing digital broadcasting and satellite broadcasting (DBS).
In the 1930s, radio programs and television programs (telecommunications) were an integral part of the American lifestyle.
Over the past decade, the early amateur radio of the 1920s has provided information in the form of a Morse code; a set of on / off audible signals provided communication on telegraph lines, submarines, and radio circuits for transmitting distress signals. The II. During the World War, a Morse code radio was vital. In addition, Mayday made calls to signal a life-threatening emergency. Fire, explosion or sinking vessel or aircraft, which is advertised three times in a row ("Mayday Mayday Mayday"); Emergency calls were made during an emergency to help with help.
We used an amateur radio broadcast soon to be tuned; a frequency range (restrained only for commercial, police and government use) enabled one- and two-way communication until the 1940s. Ham radio was an emergency radiation system that could turn to a wider community in case of an emergency, such as a natural disaster. The SOS (Amateur Threshold Call) sent by Titanic used radio ham in April 1912, on the Ham Radio History website of the National Association of Amateur Radio (ARRL).
In the 1950's, CONELRAD (electromagnetic radiation control) was a method of emergency radiation for the public; The CONELRAD system (used during the Cold War) was replaced by the Emergency Broadcast System (EBS) in the 1960s, which was replaced by the Emergency Alarm System (EAS) in the 1990s. Regardless of the name change, each country provided a national alert system to the American public for war or severe national crises, in local weather conditions. Such broadcasting systems played a vital role in emergencies to quickly provide the necessary warning and message to the community when a disastrous situation exists. In essence, he announced the response to emergency radiation, which could potentially save human lives and issue instructions if evacuation was needed.
To date, radio broadcasting was the most useful media that can be used to bargain civilian emergency messages.
In the history, mass media have been widely accepted for information, especially in times of seriousness, and even during times of wars. It is a fact that radio communication can be maintained even if other means of communication are unsuccessful and there is no power. In addition, this is a media that everyone can access. Taking real-time warnings for citizens in an emergency proves that radio equipment – even in the age of computers and mobile devices – can be extremely important today, in an emergency.
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