Broadcasting has a long history; one that goes beyond Tesla, Marconi and Armstrong, and includes advances in communication and technology, according to Radio magazine. Some of the important dates in radio’s past are covered on the AmericanRadioHistory.com website. There you can read about the early forms of radiotelegraphy systems.
Indeed, the early 1920s mark an important date in the time of radiotelegraphic communication: at that time, the foundations of public radio network transmission and even early television programming were provided – scientists they were experimenting in 1925 with televisions to include video content broadcast by radio broadcasts on channels designated to a dispersed audience.
Early audio broadcasting started the AM broadcast on a radio station. To overcome the interference problems of AM radio, stations began using FM radio in the 1930s as its band provided clearer audio sound through the air as radio waves from a transmitter to an antenna. . It wasn’t until the 2000s that Americans became aware of digital radio and direct satellite broadcasting (DBS).
In the 1930s, broadcasting and television (television broadcasting) were an integral part of the American way of life.
In the previous decade, the 1920s, the first radio amateurs transmitted information in the form of Morse code; a series of on and off tones provided communication on telegraph lines, submarine cables, and radio circuits to transmit emergency signals. Morse code radiotelegraphy was vital during World War II. Mayday calls were also made over the radio to signal a life-threatening emergency. A fire, explosion or sinking of a ship or aircraft, where it is announced with a signal transmitted three times in a row (“Mayday Mayday Mayday”); the distress call was broadcast for help in times of emergency.
A device called radio amateur was used from the beginning for radio broadcasting of radio amateurs; a variety of frequencies (reserved for commercial, police, and government use only) enabled one-way and two-way communication in the 1940s. Amateur radio turned out to be a kind of emergency broadcast system to spread the word to the wider community in in the event of an emergency, such as a natural disaster. Apparently, the SOS (Amateur Call for Help) sent by the Titanic had used a radio amateur in April 1912, noted the ARRL (American Radio Relay League), the national association of radio amateurs, on its “Ham Radio History” web page. .
In the 1950s, CONELRAD (Electromagnetic Radiation Control) was an emergency transmission method to the public; The CONELRAD system (used during the Cold War) was replaced by the Emergency Transmission System (EBS) in the 1960s, which was later replaced by the Emergency Alert System (EAS) in the 1990s. Regardless of the change in Namely, each served as a national alert system for the American public in the event of war or serious national crisis, in addition to local weather emergencies. Such transmission systems played a vital role in emergencies to quickly provide the necessary warning and message to a community when a disastrous situation arose. In essence, it announced an emergency broadcast response that could save human lives and deliver instructions if an evacuation was required.
To this day, broadcasting has been the most widely used means of distributing civil emergency messages to the public.
In history, it has been widely accepted as a means of mass communication of information, especially in times of severe weather and even war-related threats. In fact, radio communication can be maintained even when other means of communication fail and there is no power. In addition, it is a medium to which everyone has access. The transmission of real-time alerts to citizens in the event of an emergency shows that communication devices such as radios can still be of great importance, today, in emergencies even in the age of computers and mobile devices.