Radio is a technology used for signal transmission and modulation by electromagnetic radiation (electromagnetic waves). These waves propagate across and through the air and can also propagate through the vacuum of space, because these waves do not require the carrier medium (such as air molecules).
Basic theory of propagation of electromagnetic waves was first described in 1873 by James Clerk Maxwell in his paper at the Royal Society on the dynamic theory of the electromagnetic field (English: A dynamical theory = CE = BFF th = D0 = B5 electromagnetic field), based on the results of the research work between 1861 and 1865.
History of Radio
In 1878 David E. Hughes was the first to transmit and receive gelombangradioketika he found that the induction balance caused disruption to phone makes. He demonstrated his discovery to the Royal Society in 1880 but only say it's just an induction.
Heinrich Rudolf Hertz was that, between 1886 and 1888, the first time to prove Maxwell 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 derivative equation called the wave equation.
A Brief History of Radio
1877: Edison introduced the phonograph
1895: Marconi discovered radio transmitter and turn it into a business
1906: De Forest invented the vacuum tube
1920: Frank Conrad start KDKA in Pittsburg
1926: RCA launch radio network NBC
1934: Federal Communications Commission Didirikankannya
1949: The start of an era radio DJ
1970: FM stations increased, began sounding echo and already has a segmented audience
1996: The behavior of radio communication led to many mergers and cooperation
2000: The internet site Napster was ordered to put an end to file sharing on the internet for free
2002: Radio station's agreed to share some of its profits to the musicians and = C6 = 96 = D0 = D0 = B5 = B0b = C6 = 96 to use copyrighted music.
Satellite Radio
Radio broadcast technology revolutionized with the advent of satellite-based radio broadcasting (satellite radio broadcast). Its history began in 1992 in the United States (U.S.). At that time, the FCC (Federal Communications Commission) which is the regulatory body in the U.S. telecommunications allocate a frequency band spectrum in the "S" (about 2.3 GHz) for nationwide broadcasting (in the U.S.) using satellite-based digital audio (digital audio radio service / DARS). There are only four companies that volunteered to get a broadcast license.
Radio
In 1997, the FCC gave permission to: CD Radio (which changed its name to Sirius Satellite Radio) and American Mobile Radio (which changed its name to XM Satellite Radio). Each paid over 80 million dollars for using bands or frequency band is available. Apparently, only the XM Radio who can continue his business and began broadcasting nationally on 25 September 2001. While Sirius has not been able to follow up, with intense anekaprogramdan XM Radio offers high-quality audio reception for fans of home audio and car audio. From the center of the broadcast (broadcast center) in Washington DC that has 82 digital studio, XM Radio 101 channels emit berisiprogramacara: music, news, interviews or talk = D1 = 95H = CE = BFW, sports, comedy, and children's events. The 101 line was emitted together into the satellite. The customers can receive directly from satellite or through a repeater station (repeater) that exist.
Cellular Radio Merger
Ease of various purposes can be accessed through mobile phones thanks to the incorporation of RFID technology (Radio Frequency Identification) technology provider. RFID technology is translated by the official website of RFID as a common terminology to describe the transmission system identification (auto ID) wirelessly via radio waves. Auto ID include bar codes, optical character readers and some biometric technologies such as retina scanners. Auto ID techniques are used to reduce labor costs, time efficiency, and accuracy of the data makes more precise than the manual way.
Radio phone
RFID microchip could in principle respond to radio signals with a remote transmitter. With the patch antennas are also micro-majority RFID works without batteries due to send back responses using power from the RFID radio signals. In short this process, it's no wonder companies with process monitoring bejibun stuff like supermarkets are making use of the advantages of this technology. The advantage of RFID is then harassing phone vendor interest in the handset marry.
