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Radio waves were first identified and studied by German physicist Heinrich Hertz in 1886. The first practical radio transmitters and receivers were developed around 1895-6 by Italian Guglielmo Marconi, and radio began to be used commercially around 1900.
In 1900, construction began on a large radio transmitting alternator. Descended, experimenting with a high-frequency spark transmitter, successfully transmitted speech on December 23, 1900, over a distance of about 1.6 kilometers (0.99 mi), the first audio radio transmission.
On 17 December 1902, a transmission from the Marconi station in Glacé Bay, Nova Scotia, Canada became the world's first radio message to cross the Atlantic from North America.
The first practical radio transmitters and receivers were developed around 1895-6 by Italian Guglielmo Marconi, and radio began to be used commercially around 1900.
First radio transmission sent across the Atlantic Ocean. Italian physicist and radio pioneer Guglielmo Marconi succeeds in sending the first radio transmission across the Atlantic Ocean, disproving detractors who told him that the curvature of the earth would limit transmission to 200 miles or fewer.
In the 1920s, radio was first used to transmit pictures visible as television. During the early 1930s, single side band (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
Radio broadcasting was the cheapest form of entertainment, and it provided the public with far better entertainment than most people were accustomed to. As a result, its popularity grew rapidly in the late 1920s and early 1930s, and by 1934, 60 percent of the nation's households had radios.
Guglielmo Marconi: an Italian inventor, proved the feasibility of radio communication. He sent and received his first radio signal in Italy in 1895. By 1899 he flashed the first wireless signal across the English Channel and two years later received the letter “S”, telegraphed from England to Newfoundland.

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