Who invented the radio? strong> Radio is an electronic device that broadcasts and broadcasts in the form of electromagnetic waves in order to send and receive information. Radio is one of the most important inventions of telecommunications. Radio; telephony, television, radar strong>, and fax strong> devices.
Radio strong> is the most important piece of information that has been used in every era and has never lost its importance until today.
Radio strong> comes from the word radius. It is used as an example in expressing many events and devices related to electromagnetic waves.
Theoretically, J.C. Strong>, which first theoretically propagates electromagnetic waves with light speed in space, is the term used in radio astronomy, radio-electric, radiofrequency, radiopusula, radiotelescope, radiotelegraphy and radiocontrol. Maxwell strong> dir. The first experiment in this regard was made by the German physicist Heinrich Hertz between 1886-1888. Hertz applied electricity to the two plates and obtained a high frequency of 75 megahertz.
The first passage to radio broadcasting was the 1896 strong> Italian physicist Guglielmo Marconi strong> in 1890 strong> > O. Lodge strong> by turning it into a Morse device. The first broadcast was a mile away, and in 1901 it reached 200 miles. The application was mostly in the form of telegraph strong> information transfer from offshore territories. In Marconi’s morse device, electromagnetic waves reduce the resistance between the two ends of the tube by affecting loose iron powders in a tube, thus converting the electromagnetic energy into electrical energy.
In 1906, an American engineer named G.W. Pickard strong> found that the crystal he made from silicon also passed the electromagnetic wave. This invention was caused by British physicist Hughes strong> who used it as an electromagnetic wave detector in 1900 with a slight contact with the carbon plate. In 1904, J.
The Fleming electron tube was developed in 1907 with a big step as the De Forest strong> found that the triode electron tube could be used as a detector. electron current triode gridin showed a change in resistance between triode anod cathode.
The radios broadcasting in various frequencies started with the application of crystals working with piezoelectric principle in 1923. The crystals are made of very sensitive oscillators and the radio frequency band is enlarged. While the radio could not be broadcast on 30 megahertz in 1930, today the radio frequency band has expanded to 30,000 megahertz. This includes radar, laser, and maser transmissions.
A transmitter, antenna, and broadcast environment is required for the radio broadcast. Sound coming from the microphone, the transmitter modular carrier provides high frequency electromagnetic wave vibration spreading to the center. Electromagnetic waves, including the atmosphere, can propagate in space. The electromagnetic waves are picked up by the antenna and heard from the speaker after the modulated carrier frequency wave is resolved.
Radio frequency is produced in oscillators. The radio frequency is modulated by a voice signal carrying information before it is transmitted to the remote. The modulation is either amplitude (Amplitude) modulation (AM) or frequency modulation (FM). The receiver radio, which receives the amplitude modulation or FM broadcast, uses the oscillator frequency to filter out and amplify the audio signal carrying information from the radio frequency and give it a loudspeaker. Shared Information Multipath.