The invention of radio happened after the discoveries of telegraph and telephone. This trio of technologies is related to each other. Radio began as a cordless telegraphy. As a matter of fact, it all started with the great discovery of radio waves. These waves can transmit music, speech and pictures through air. Moreover, lots of devices, such as wireless phones, radio and microwave TV work via the electromagnetic waves.
In 1860, s Scottish physicist named James Maxwell forecast the radio waves. In 1886, another expert Heinrich Hertz demonstrated the projection of variation of electric current in the form of powerful radio waves.
After the invention of telephone, experts found that music can be transmitted through telephone lines. An expert named Guglielmo Marconi discovered how to use radio signals. He was an Italian discoverer who showed the feasibility of radio communication. Actually, he was fascinated by the discovery of radio waves by Hertz. He realized that the radio waves could send and receive telegraph messages. He referred to it as powerful wireless telegraphs.
In 1896, his coded signals were transmitted to just a mile away. Then Marconi recognized the potential of it and made an offer to the Government of Italy, but was rejected. After moving to England, he realized a patent and made an experiment. In 1898, Marconi flashed the Kingstown Regatta results to the office of Dublin Newspaper. It was the first public broadcast of this great sports event. Soon, he started his radio factory and established a link between Britain and France. In 1901, he established a link with America as well. He also got Noble Prize in Physics for his invention in 1909.
The problem was that the wireless telegraph transmitted signals only. Transmission of voice through this technology was started in 1921. In 1922, Marconi gave us the news of short wave transmissions. However, he was not the only inventor of the radio. Actually, Nikola Tesla, another great personality, who moved to the USA in 1884, introduced the theoretical model of radio before Marconi.
Another claimant to the throne of this technology is J.C Bose. In 1896, he demonstrated radio transmission to the British Governor General at Calcutta. Interestingly enough, the transmission happened for a distance of about 6 kilometers. As a matter of fact, his instrument was connected to the telephone detector.
Actually, Bose took care of the problem of the penetration via water, walls or mountains. Actually, the Cohere of Marconi is considered the same thing as the Coherer of Bose. In the start, Bose was a bit hesitant to apply for patent since he believed in the freedom of inventions in science. However, he applied for one when some of his friends persuaded him to do so in 1901. He got the patent in 1904.
At last, radio transmitters got a lot better. Global radiotelegraph services got developed since early transmitters made it possible to discharge the electricity between the electrodes and in the circuit that caused too much interference. These problems were fixed by De Forest and Alexanderson.
Long story short, research has been on to improve the radio transmission. As a matter of fact, Radio has become a great medium of entertainment. The fact of the matter is that technological advancements of today have resulted in internet radio. In this field, satellite radio is another great development. Nowadays, you can listen to any international radio station without any problem.