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Marconi's experimental apparatus proved to be the first engineering-complete, commercially successful radio transmission system.
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transmitted the human voice wirelessly for a distance of approximately a half mile. One year after that experiment, he received his first patent from the Brazilian government. Four months later, knowing that his invention had real value, he left Brazil for the United States with the intent of patenting the machine in the US.
The next advancement was the vacuum tube detector, invented by Westinghouse engineers. -
developed by Adolf Slaby and Georg von Arco. In 1900, Reginald Fessenden made a weak transmission of voice over the airwaves. In 1901, Marconi conducted the first successful transatlantic experimental radio communications.
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eversed its decision, awarding Marconi a patent for the invention of radio, possibly influenced by Marconi's financial backers in the States, who included Thomas Edison and Andrew Carnegie. This also allowed the U.S. government (among others) to avoid having to pay the royalties that were being claimed by Tesla for use of his patents. For more information see Marconi's radio work.
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used a synchronous rotary-spark transmitter for the first radio program broadcast, from Ocean Bluff-Brant Rock, Massachusetts. Ships at sea heard a broadcast that included Fessenden playing O Holy Night on the violin and reading a passage from the Bible.[38] This was, for all intents and purposes, the first transmission of what is now known as amplitude modulation or AM radio.
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an electronics instructor in San Jose, California constructed a broadcasting station. It used spark gap technology, but modulated the carrier frequency with the human voice, and later music.
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is credited with developing many of the features of radio as it is known today. Armstrong patented three important inventions that made today's radio possible.
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was introduced in the Americas in 1978,[44][45][46] gave much more capacity. It was the primary analog mobile phone system in North America (and other locales) through the 1980s and into the 2000s.
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became the premier radio navigation system.
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constellation in 1987. In the early 1990s, amateur radio experimenters began to use personal computers with audio cards to process radio signals
