In 1896, an Italian scientist, Guglielmo Marconi patented his findings regarding the wireless telegraph using two circuits. The tool he discovered was the beginning of the use of technology to create radio. Initially, the signal that can be sent by the wireless network is less than 10 miles. But in 1897, Guglielmo Marconi re-published new findings that could send wireless signals at a distance farther than before, which was 12 miles. In the meantime, perhaps you also want to check out the best pocket radio that you can buy.
In 1899, Guglielmo Marconi succeeded in making wireless communication between France and England through the English Channel using the Tesla oscillator. Then in 1904, John Ambrose Fleming managed to find an audio tube that could be used as a wireless signal receiver for radio technology that was previously developed by Guglielmo Marconi. In 1906, Dr. Lee de Forest developed audio tube technology consisting of three elements, called triode audion. The discovery of Lee de Forest allows sound wave signals to be transmitted through wireless communication systems. Although the signal captured by the device is still very weak.
Around 1912, Edwin Howard Armstrong invented a device called a radio amplifier, a device for radio wave amplifiers. This tool works by capturing electromagnetic signals from radio transmissions and sending back signals from audio tubes. With this radio wave amplifier, the signal produced will increase by 20,000 times per second. This tool can also allow the sound to be issued louder so that it can be heard directly without the need for earphones. The discovery of this tool then becomes very important in radio communication systems because it is far better and more efficient than the findings of previous tools.
Edwin Howard Armstrong then found a frequency modulation system (FM) that produced clearer sound and was not disturbed by bad weather in 1933. However, his discovery was not supported by many people, because when the new tool was created there was economic turbulence in the world, so cannot be mass produced. Armstrong later founded the first FM radio station at his own expense in 1940. His struggle to develop the FM system was so heavy that he was finally depressed and decided to end his life.