Radio technology is a technology that uses radio waves to transmit information in the form of images and sound. This radio technology technique is a systematic modulation of electromagnetic energy waves propagated through the air. This radio wave modulation uses both FM frequency and AM amplitude.
This radio technology was first discovered in 1880 by Heinrich Hertz. If you look at radio technology now, it doesn’t use analog anymore but uses digital technology that uses the internet. To understand the development radio technology Until now we need to discuss the early history of radio use.
Early History of Radio Use
At first the forerunner of the development of radio began with the creation of the gramophone or phonograph, namely Thomas Alfa Edison, who was the most influential scientist in 1877.
So Helmholtz Hertz and James Clerk Maxwell began researching electromagnetic phenomena which succeeded in discovering radio waves afterwards.
They also began to conclude that radio waves can propagate through spherical objects. In 1887 Heinrich Hertz succeeded in discovering the sending and receiving of radio waves.
Until the end of 1901 a scientist named Guglielmo Marconi conducted research on radio waves which then resulted in being able to send and receive waves using a receiver.
It sends signals in the form of dots and lines through a transmitter that uses electromagnetic waves. With these experimental results, he is called the inventor of radio.
History of Radio in Wartime
Radio also plays a very important role in times of war. Radio began to be used as a communication tool in the maritime sector to send telegraph messages using Morse code.
Morse code sent in the form of dots and dashes sent between ship and land. One of the most suitable examples is the use of radio by the Japanese navy during World War II.
During the second world war radio was also used by both sides of the war to send orders from the highest chain of command to all troops on the battlefield.
Apart from being a communication tool, radio developments can also be used to search for coordinates of aircraft and ships using radar.
History of AM Radio (Amplitude Modulation)
AM radio or Amplitude Modulation is a type of radio with the principle of modulating radio waves and audio.
Both radio and audio waves also have a fixed magnitude, so with the modulation process the radio waves can be adjusted through the amplitude of the audio waves.
In this concept, radio waves become sound waves that will be carriers of information.
Guglielmo Marconi was the scientist who first developed a type of AM DI radio frequency capable of transmitting voice signals over long distances of up to 12 miles. Marconi managed to transmit information by air from England to France using the Tesla oscillator.
Then John Fleming in 1904 was able to make an audion tube that was used as a means of receiving information signals with radio waves.
Then scientist Lee deForest has also developed an electron tube which is composed of three parts called the audion triode. However, this Fleming-made tool is still very weak in capturing signals.
Then this technology was continued by Edwin H Armstrong in 1912 with a radio amplifier that can amplify radio waves and by capturing radio signals from electromagnetic transmissions and providing feedback signals from tubes.
This process is able to provide a stronger signal 20 thousand times per second. The sound captured by the receiver becomes more powerful with this tool. Armstrong’s invention became one of the greatest radio developments in the world.
History of FM Radio (frequency modulation)
FM radio or frequency modulation is a type of radio that can modulate the frequency of radio waves.
These radio waves are frequency modulated to follow the sound waves. The difference from AM, FM is the type of modulation that is carried out, where AM radio modifies the amplitude of the wave while FM radio modulates the frequency of the radio wave.
In other words, the development of FM radio is a refinement of the previously developed AM radio.
Radio Station Development
The first radio station was created by Reginald Aubrey Fessenden in the United States. The radio station still uses AM radio frequency. Before establishing radio stations, radio technology was only used for wireless telegrams.
This first radio station was a new way of using radio as a means of broadcasting human voices in 1900. The radio broadcast range was quite wide up to 50 miles, then after it was discovered that FM radio frequency was developed by Armstrong himself, by 1960 there were almost 2000 radio stations throughout America. Union.
Biography of Guglielmo Marconi, the Inventor of Radio
Earlier we discussed a little about the history of radio technology. Which radio is also closely related to the inventor of the first radio, namely Guglielmo Marconi.
Guglielmo Marconi was the one who first contributed to the creation of radio. He was born in Bologna, Italy 1874. Guglielmo Marconi he was born into a wealthy family which had father Giuseppe Marconi and mother Annie Jameson. Guglielmo’s father was a wealthy man with the title of landlord. Guglielmo himself was trained by a lecturer at the Livorno Institute of Technology and the University of Bologna.
At the age of 20 years Guglielmo conducted experiments in experiments conducted by Heinrich Hertz. He conducted experiments and research on electromagnetic waves that can move and carry messages via the air. He is the owner of a short-range wireless communication technology development degree. Its discovery is also of historical importance for mankind.
1. Guglielmo Marconi’s Youth
At the age of 20 Guglielmo was appointed by a teacher, he was interested in the research of Heinrich Hertz, the discoverer of the Hertz wave. Then Guglielmo said that electromagnetic waves could be used to send signals over long distances so he thought that this would be a substitute for a wireless telegram.
2. Guglielmo Marconi Invented Radio
In 1895, Guglielmo Marconi succeeded in creating his invention, namely a device known as radio in England.
Guglielmo Marconi then demonstrated an ingenious device that became known as radio in England in 1986.
Then Guglielmo Marconi then patented his invention by building a company and producing a series of inventions.
The radio device invented by Guglielmo Marconi was first launched in 1898. In the past, technology was found to convey messages over a wired network or copper wires, such as telegrams. Based on the theory and experiments of Heinrich Hertz, Marconi tried to achieve new breakthroughs by creating a cable communication tool, radio.
This goes back to the idea that electromagnetic waves could be used to send signals and messages over long distances without using wires.
In this way, people can temporarily communicate more easily with others, like sending messages and information to a ship lying at sea. Marconi had to work hard to create the radio technology he had been dreaming of for years.
In 1899, Guglielmo Marconi’s radio could send messages without crossing the English Channel. Guglielmo Marconi consistently perfected radio when he understood that his invention still had many shortcomings.
In the biography of Guglielmo Marconi, he received a radio in 1900, which is known to have succeeded in sending messages from England across the Atlantic Ocean to Newfoundland, Canada.
His invention of Radio Guglielmo Marconi brought great benefits to mankind. It was clear that his radio could see the SS Republik was damaged in the collision and sunk to the seabed in 1909.
3. Guglielmo Marconi Wins Nobel Prize in Physics
In 1909 Guglielmo Marconi had won the Nobel Prize in Physics for the discovery of this radio. He shared the Nobel Prize with German physicist Karl F. Brown who is best known as the inventor of the cathode tube.
But so many doubt the title of Father of Radio given to Guglielmo Marconi.
Because in 1895, a Russian physicist named Alexander Popov succeeded in broadcasting radio between buildings. Then In India, a man named Jagadish Chandra Bose used radio waves that could ring a bell, causing an explosion.
Then in 1901, there was an electrical scientist named Nikola Tesla who stated that he invented wireless telegraphy in 1893. That’s why the US Supreme Court revoked four radio patents filed by Marconi because it had been developed by Nikola Tesla.
But Radio Marconi saved the lives of hundreds of people. Thanks to radio Marconi, shipping companies realized the use of wireless telegraphy for passenger communication, navigation messages, and emergency signals.
The court proceedings against his patent on radio inventions were completed when Marconi decided to get his patent. But he also carried out important research in the fields of shortwave and microwave communication. Guglielmo Marconia is known as the inventor of the world’s first radio.
4. Guglielmo Marconi Dies
During his 20 year career, Marconi’s fame in radio technology further enhanced his discoveries. Experiments with shortwave transmission, and testing the radio transmission range aboard an Elettra cruise ship. Then Marconi returned to Italy and became a follower of the dictator Benito Mussolini.
In 1935, he still had time to travel from Brazil to Europe. Then two years later Guglielmo Marconi died of a heart attack in Rome, Italy, on July 20, 1937.
In his honor, the governments of the United States, Britain and Italy observed a minute’s silence. Because of the invention of radio, it can help the interests of many people and has been developed to this day.