Radio communication

Marconi had born in Italy in 1874. He was privately educated. During his early years Marconi had an interest in science and electricity. At the age of 18, Marconi became a neighbor of university of Bologna physicist Aigusto Righi who had done research on Heinrich Herd’s work. Righi permitted Marconi to attend lectures at the university and also use the university laboratory and library.

In the early1890s, he began working on the idea of wireless telegraphy and began to conduct experiments on radio waves; Building much of his own equipment in the attic of his home. As no encouragement was coming from Italy government, he went to England with his mother and met the chief engineer of post office London. In 1896 his inventions of “wireless telegraphy “were demonstrated at Royal society London.

·         1897- Marconi transmitted Morse code signal over a distance of six Kms. He established a Marconi company. Wireless telegraphy was born.

·         1898- The wireless signal was transmitted on a 12 miles distance.

·         1901- He established a wireless transmission station, at Wexford, to link England and Ireland.

·         This signal was also received in Canada, where he used 150m high antenna for signal detection. The distance covered was 3500 Km. for this; the transmission wavelength used was nearly 350m (850kHzs). It was observed that during night, the signal reached farther and farther but in day time it was reduces to half the distance about 1100Kms.

·         1902- The signal crossed Atlantic.

·         1904- A commercial service was established to transmit night news summaries to ships.

·         1907- A regular Trans Atlantic radio telegraph service was begun.

·        1909-  Marconi shared Nobel Prize in physics for his radio work.

·         The company struggled to provide reliable communication to others. Long after it was apparent that the future of radio communication lay with continuous wave transmissions.

·         1915- After the introduction of the oscillating vacuum tube (valve), the first radio broad-casting began in 1920.

·         1922- Regular entertainment broadcasting service commissioned for BBC.