Group2a.pptx

“ The Birth of Radio”

• 1897- “The Birth of Radio”- Marconi awarded patent for wireless telegraph

• 1897- First “Marconi station” established on Needle island to communicate with English coast

Guglielemo Marconi -is often called the "Father of Radio" for the many developments he made to radio, and although he probably did more than any other person to advance radio technology, he freely admitted that he did not invent it.

-In 1896, Marconi was awarded British patent 12039, Improvements in transmitting electrical impulses and signals and in apparatus there-for, the first patent ever issued for a Hertzian wave (radio wave) base wireless telegraphic system. -In summer 1894 he built a storm alarm made up of a battery, a coherer (an early detector that changed resistance when exposed to radio waves) and an electric bell which sounded a ring if there was lightning.

Marconi's first transmitter incorporating a monopole antenna. It consisted of an elevated copper sheet (top) connected to a Righi spark gap (left) powered by an induction coil(center) with a telegraph (right) to switch it on and off to spell out text messages in Morse Code. -In the 1920s, radio was first used to transmit pictures visible as television. During the early 1930s, single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.

On 17 December 1902, a transmission from the Marconi station in Glace Bay, Nova Scotia, Canada became the world's first radio message to cross the Atlantic from North America. In 1901, Marconi built a station near South Wellfleet, Massachusetts that sent a message of greetings on 18 January 1903 from United States President Theodore Roosevelt to King Edward VII of the United Kingdom. However, consistent transatlantic signaling was difficult to establish.

In 1897, he established a radio station on the Isle of Wight, England. Marconi opened his "wireless" factory in the former silk-works at Hall Street, Chelmsford's, England in 1898, employing around 60 people. Shortly after the 1900s, Marconi held the patent rights for radio. Marconi would go on to win the Nobel Prize in Physics in 1909 and be more successful than any other inventor in his ability to commercialize radio and its associated equipment into a global business

British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897.

In November, 1897, Marconi's first permanent transmitting station was erected at The Needles, Alum Bay, Isle of Wight in the south of England, and the next year saw the opening of the world's first "wireless telegraph" factory in Hall Street, Chelmsford, England, employing around 50 people.

“Transoceanic Communication” • 1901- Marconi successfully transmits radio signal across Atlantic Ocean from (First wireless communication across the ocean). At 1901 , Marconi built a powerful wireless

station at poldhu, Cornwall (corresponding IEEE Milestone) in preparation for a transatlantic test.

• 1902- First bidirectional communication across Atlantic • 1909- Marconi awarded Nobel prize for physics