History of Inventions and Innovations Radio

Radio waves are classified according to wavelength or frequency. If the wavelength is high, then definitely a low frequency or vice versa. The frequency of radio waves from 30 kHz up and grouped according to broad bands. The radio waves generated by electric charges are accelerated through conductive wires. These charges are generated by electronic circuit called the oscillator. These radio waves emitted from the antenna and received by the antenna as well. You can not hear the radio directly, but the radio receiver will change the first wave energy into sound energy.


History of Inventions and Innovations Radio

The history of invention and innovation following the radio I quoted from various sources, including Wikipedia. It feels less afdol when we mengdengarkan radio every day but do not know the origin of the radio itself.

Radio is a technology used for signal transmission and modulation by electromagnetic radiation (electromagnetic waves). This wave passes and travel by air and can also travel through the vacuum of space, because this wave does not require the carrier medium (such as air molecules).

Radio waves are a form of electromagnetic radiation, and is formed when electrically charged objects is modulated (increased frequency) at frequencies contained in the radio frequency (RF) in an electromagnetic spectrum. These radio waves are in the range of 10 hertz (Hz) to several gigahertz (GHz), and electromagnetic radiation moves by way of oscillating electric and magnetic.

Other electromagnetic waves, which have frequencies above the radio waves include gamma rays, X-rays, infrared, ultraviolet, and visible light. When the radio waves transmitted through the cable, the oscillation of electric and magnetic fields are expressed in the form of alternating current and voltage on the cable. This can then be converted into an audio signal or any other that carries information.

Although the word 'radio' is used for matters relating to the receiver of sound waves, but wave transmission is used as the basis of the wave on television, radio, radar and cell phones in general.

Basic theory of electromagnetic wave propagation was first described in 1873 by James Clerk Maxwell in his paper at the Royal Society about the dynamics of electromagnetic field theory (in English: A dynamical theory of the electromagnetic field), based on the results of her research work between 1861 and 1865.

In 1878, David E. Hughes was the first to transmit and receive radio waves when he found that the induction balance caused disruption to phone product. He demonstrated his discovery to the Royal Society in 1880 but only say it was just an induction.

Is Heinrich Rudolf Hertz who, between 1886 and 1888, the first time to prove Maxwell's theory through experiment, demonstrating that radio radiation had all the wave properties (now called Hertzian waves), and found that the electromagnetic equations can be formulated into a partial differential equation called the wave equation.

Many of the early use of the maritime radio, for sending telegraphic messages using Morse code between ships and land. One of the early users included the Japanese Navy spy on the Russian fleet at the Battle of Tsushima in 1901. One use of the most memorable was at the time of the sinking of the RMS Titanic in 1912, including communications between operators on a sinking ship and nearby ships, and communication to ground stations to register the saved.

Radio used to channel commands and communications between the Army and Navy on both sides in World War II, Germany uses radio communications for diplomatic messages when the underwater cable is cut by the British. United States convey Fourteen Principal President Woodrow Wilson to Germany via radio during the war.

Press start to be done in the 1920s, with the popularity of radio, especially in Europe and the United States. In addition to the broadcast, broadcast point-to-point, including phone and re-broadcast radio program, became popular in the 1920s and the 1930s.

Role Marconi

World of radio innovation record the names Guglielmo Marconi, the inventor of radio. He was born in Bologna, Italy, April 25, 1874. His father, Giuseppe Marconi authentic Italian farmer and his mother, Annie Jameson is the son of the owner of Daphne Castle in Ireland, who was signed as a British territory. He went to Bologna, Florence, and Leghorn.

Since childhood he was interested in working Maxwell, Hertz, Righi, until the Lodge. In the age of 21 years, 1895, he made a laboratory in his father's house, in Pontecchio. He conducted research about radio waves - when it referred to as "Hertzian Waves" - to send a telegraph signal. It was only through the telegraph wires. He has managed to send a telegraph signal for a distance of about 2 kilometers. Findings radio practically in the doorway so he asked for the support of Post and Telegraph Department of Italian. But the bureaucrats are not interested in Italy, even closing the door for him.

Marconi did not despair, a year later he contacted the British Postal Service. William Preece, chief engineer Postal Service England, Marconi was willing to meet with him and who later came to showcase his creations radio capability on the plains of Salisbury and, later, across the Bristol Channel. Preece was impressed, and eventually founded the company Marconi Wireless Telegraph & Signal The Company Limited in 1897, which later transforms into Marconi's Wireless Telegraph Company Limited.

In two years, 1899, he has built a radio between France and Britain, followed later between the U.S. and Britain.

Over a decade until 1912, he patented a number of findings to improve the radio system he created. In 1909 he received the Nobel Prize in physics.

In 1914, Marconi was called into the Italian Army. He became a diplomat Italy to America in 1917.

Once the government no longer part of Italy, he returned to the laboratory. By World War II, in 1935, he demonstrated the latest findings, namely Radar. Two years later, July 20, 1937, Marconi died in Rome.

Role Howard

Edwin Howard Armstrong was recorded as the inventor of FM radio. He was born on December 18, 1890 in New York City. His father was publisher of books and his mother a teacher. At the age of 14 years, Armstrong read a book written by Marconi telegraph. He was very impressed with Marconi, just that he wanted to improve the creation Marconi radio. So Armstrong had intended to make clear-voiced radio while making their own radio station at his home. To that end, Armstrong entered the Faculty of Electrical Engineering at Columbia University. He graduated and became a great teacher and electrical engineer.

In 1912, Armstrong managed to make a regenerative circuit and feedback circuit. He also studied a hollow tube made of De Forest, who named trioda and audion. Later, Armstrong combines its discovery, with a hollow tube made of De Forest. The results of the exit tube sound a thousand times more clear.

Unfortunately, De Forest's invention is considered his property. They fight the copyright, for 14 years in court. Finally, De Forest becomes the winner, because judges do not understand the science of electricity.
But scientists still think Armstrong was the inventor of the circuit and FM radio. He was awarded the Franklin Medal and was nicknamed "Father of Circuit". On February 1, 1954, Armstrong died in New York. He was synchronized with the old inventor, in the field of electricity such as Amphere and Bell.