Radio Wikipedia. Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form. Radio systems need a transmitter to modulate change some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation which can be frequency modulation or phase modulation. Radio systems also need an antenna to convert electric currents into radio waves, and radio waves into an electric current. Sign up for breaking bulletins, promo codes and special offers from the biggest players in the industry. As the nations largest provider of promotional content for 24 years, Promo Only offers DJs, radio stations and entertainment venues unprecedented access to the. WD 4TB Desktop Mainstream Internal Hard Drive Retail Kit WDBH2D0040HNCNRSN,Western Digital. Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted. January 30, 2015 Lee Baby Simms, a veteran of Los Angeles radio, has died. Claude Hall, former editor of Billboard Magazines Vox Jox section. The Future Of Artist Marketing is Here. Reach the largest database of radio DJs, mobile DJs and club DJs on the planet. The only service that built the tools you. The latest news and headlines from Yahoo News. Get breaking news stories and indepth coverage with videos and photos. An antenna can be used for both transmitting and receiving. Pos Software For Small Business. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form that is usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 k. Hz to 3. 00 GHz, although commercially important uses of radio use only a small part of this spectrum. A radio communication system sends signals by radio. The radio equipment involved in communication systems includes a transmitter and a receiver, each having an antenna and appropriate terminal equipment such as a microphone at the transmitter and a loudspeaker at the receiver in the case of a voice communication system. EtymologyeditThe term radio is derived from the Latin word radius, meaning spoke of a wheel, beam of light, ray. It was first applied to communications in 1. French scientist Ernest Mercadier, Alexander Graham Bell adopted radiophone meaning radiated sound as an alternate name for his photophone optical transmission system. However, this invention would not be widely adopted. Following Heinrich Hertzs establishment of the existence of electromagnetic radiation in the late 1. Hertzian waves, electric waves, and ether waves, while phrases describing its use in communications included spark telegraphy, space telegraphy, aerography and, eventually and most commonly, wireless telegraphy. However, wireless included a broad variety of related electronic technologies, including electrostatic induction, electromagnetic induction and aquatic and earth conduction, so there was a need for a more precise term referring exclusively to electromagnetic radiation. The place for everything in Oprahs world. Get health, beauty, recipes, money, decorating and relationship advice to live your best life on Oprah. The Oprah Show. The first use of radio in conjunction with electromagnetic radiation appears to have been by French physicist douard Branly, who in 1. The radio prefix was later used to form additional descriptive compound and hyphenated words, especially in Europe. For example, in early 1. British publication The Practical Engineer included a reference to the radiotelegraph and radiotelegraphy,8 while the French text of both the 1. Berlin Radiotelegraphic Conventions includes the phrases radiotlgraphique and radiotlgrammes. The use of radio as a standalone word dates back to at least December 3. British Post Office for transmitting telegrams specified that The word Radio. Service Instructions. This practice was universally adopted, and the word radio introduced internationally, by the 1. Berlin Radiotelegraphic Convention, which included a Service Regulation specifying that Radiotelegrams shall show in the preamble that the service is Radio. The switch to radio in place of wireless took place slowly and unevenly in the English speaking world. Lee de Forest helped popularize the new word in the United Statesin early 1. De. Forest Radio Telephone Company, and his letter in the June 2. Electrical World about the need for legal restrictions warned that Radio chaos will certainly be the result until such stringent regulation is enforced. The United States Navy would also play a role. Although its translation of the 1. Berlin Convention used the terms wireless telegraph and wireless telegram, by 1. The term started to become preferred by the general public in the 1. Broadcasting is based upon an agricultural term meaning roughly scattering seeds widely. British Commonwealth countries continued to commonly use the term wireless until the mid 2. British Broadcasting Corporation in the UK has been called Radio Times since its founding in the early 1. In recent years the more general term wireless has gained renewed popularity, even for devices using electromagnetic radiation, through the rapid growth of short range computer networking, e. Wireless Local Area Network WLAN, Wi Fi, and Bluetooth, as well as mobile telephony, e. GSM and UMTS cell phones. Today, the term radio specifies the transceiver device or chip, whereas wireless refers to the lack of physical connections thus equipment employs embedded radio transceivers, but operates as wireless devices over wireless sensor networks. Processesedit. Radio communication. Information such as sound is converted by a transducer such as a microphone to an electrical signal, which modulates a radio wave sent from a transmitter. A receiver intercepts the radio wave and extracts the information bearing electronic signal, which is converted back using another transducer such as a speaker. Radio systems used for communication have the following elements. With more than 1. Transmitter and modulationeditEach system contains a transmitter, This consists of a source of electrical energy, producing alternating current of a desired frequency of oscillation. The transmitter contains a system to modulate change some property of the energy produced to impress a signal on it. Whatsapp Xtract 2.0 there. This modulation might be as simple as turning the energy on and off, or altering more subtle properties such as amplitude, frequency, phase, or combinations of these properties. The transmitter sends the modulated electrical energy to a tuned resonantantenna this structure converts the rapidly changing alternating current into an electromagnetic wave that can move through free space sometimes with a particular polarization. An audio signal top may be carried by an AM or FM radio wave. Amplitude modulation of a carrier wave works by varying the strength of the transmitted signal in proportion to the information being sent. For example, changes in the signal strength can be used to reflect the sounds to be reproduced by a speaker, or to specify the light intensity of television pixels. It was the method used for the first audio radio transmissions, and remains in use today. AM is often used to refer to the medium wave broadcast band see AM radio, but it is used in various radiotelephone services such as the Citizen Band, amateur radio and especially in aviation, due to its ability to be received under very weak signal conditions and its immunity to capture effect, allowing more than one signal to be heard simultaneously. Frequency modulation varies the frequency of the carrier. The instantaneous frequency of the carrier is directly proportional to the instantaneous value of the input signal. FM has the capture effect whereby a receiver only receives the strongest signal, even when others are present.