barcode generator c# code One: Radio Background and History in Software

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One: Radio Background and History
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Figure 1-1 Electromagnetic spectrum
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Note that at the time all the research being conducted in what was to become radio and later radio-electronics, was done by physicists In 1895, the father of modem radio, Guglielmo Marconi, of Italy, put all this together and developed the first wireless telegraph and was the first to commercially put radio into ships The wire telegraph had already been in commercial use for a number of years in Europe The potential of radio was finally realized through one of the most memorable events in history With the sinking of the Titanic in 1912, communications between operators on the sinking ship and nearby vessels, and communications to shore stations listing the survivors brought radio to the public in a big way AM radio broadcasting began on November 2, 1920 Four pioneers: announcer Leo Rosenberg, engineer William Thomas, telephone line operator John Frazier and standby RS McClelland, made their way to a makeshift studio actually a shack atop the Westinghouse K Building in East Pittsburgh flipped a switch and began reporting election returns in the Harding vs Cox Presidential race At that moment, KDKA became the pioneer broadcasting station of the world Radio spread like wildfire to the homes of everyone in America in the 1920s In a few short years, over 75 manufacturers began selling radio sets Fledgling manufacturers literally came out of garages over-night Many young radio enthusiasts rushed out to buy parts and radio kits which soon became available
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Radio experimenters discovered that an amplitudemodulated wave consists of a carrier and two identical sidebands which are both above and below the carrier wave The Navy conducted experiments in which they attempted to pass one sideband and attenuate the other These experiments indicated that one sideband contained all the necessary information for voice transmission, and these discoveries paved the way for development of the concept of single-sideband or SSB transmission and reception In 1923, a patent was granted to John R Carson on his idea to suppress the carrier and one sideband In that year the first trans-Atlantic radio telephone demonstration used SSB with pilot carrier on a frequency of 52 kc Single sideband was used because of limited power capacity of the equipment and the narrow bandwidths of efficient antennas for those frequencies By 1927, trans-Atlantic SSB radiotelephony was open for public service In the following years, the use of SSB was limited to low-frequency and wire applications Early developments in FM transmission suggested that this new mode might prove to be the ultimate in voice communication The resulting slow development of SSB technology precluded practical SSB transmission and reception at high frequencies Amateur radio SSB activity followed very much the same pattern It wasn t until 1948 that amateurs began seriously experimenting with SSB, likely delayed by the wartime blackouts The breakthroughs in the war years, and those following the war, were important to the development of HF-SSB communication Continued advances in
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technology made SSB the dominant mode of HF radio communication The radio-frequency spectrum, once thought to be adequate for all needs, has become very crowded As the world s technical sophistication progresses, the requirements for rapid and dependable radio communications increase The competition for available radio spectrum space has increased dramatically Research and development in modern radio systems has moved to digital compression and narrow bandwidth with highly developed modulation schemes and satellite transmission The inventor most responsible for the modern day advances in radio systems was Edwin H Armstrong He was responsible for the Regenerative circuit in 1912, the Superheterodyne radio circuit in 1918, the Superregenerative radio circuit design in 1922 and the complete FM radio system in 1933 His inventions and developments form the backbone of radio communications as we know it today The majority of all radio sets sold are FM radios, all microwave relay links are FM, and FM is the accepted system in all space communications Unfortunately, Armstrong committed suicide while still embittered in patent lawsuits: later vindicated, his widow received a windfall Sony introduced their first transistorized radio in 1960, small enough to fit in a vest pocket, and able to be powered by a small battery It was durable, because there were no tubes to burn out Over the next 20 years, transistors displaced tubes almost completely except for very high power, or very high frequency, uses In the 1970s; LORAN became the standard for radio navigation system, and soon, the US Navy experimented with satellite navigation Then in 1987, the GPS constellation of satellites was launched and navigation by radio in the sky had a new dimension Amateur radio operators began experimenting with digital techniques and started to send pictures, faxes and teletype via the personal computer through radio By the late 1990s, digital transmissions began to be applied to radio broadcasting
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and gamma ray radiation The only difference between these kinds of electromagnetic radiation is the frequency of their oscillation (alternation of the electric and magnetic fields back and forth in polarity) By using a source of AC voltage and a device called an antenna, we can create electromagnetic waves It was discovered that high frequency electromagnetic currents in an antenna wire, which in turn result in a high frequency electromagnetic field around the antenna, will result in electromagnetic radiation which will move away from the antenna into free space at the velocity of light, which is approximately 300,000,000 meters per second In radio transmission, a radiating antenna is used to convert a time-varying electric current into an electromagnetic wave, which freely propagates through a nonconducting medium such as air or space An antenna is nothing more than a device built to produce a dispersing electric or magnetic field An electromagnetic wave, with its electric and magnetic components, is shown in Figure 1-2 When attached to a source of radio frequency signal generator, or transmitter, an antenna acts as a transmitting device, converting AC voltage and current into electromagnetic wave energy Antennas also have the ability to intercept electromagnetic waves and convert their energy into AC voltage and current In this mode, an antenna acts as a receiving device
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