WHAT RADIO IS:HISTORY OF RADIO, MARCONI –THE INVENTOR

HISTORY OF RADIO:B.B.C. – 1922, Radio in Sub-Continent, PBC SERVICES >>

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LESSON 01

WHAT RADIO IS

MEANING-1

The Broadcasting of Programs

MEANING-2

The process of sending & receiving messages by converting voice into electromagnetic waves.

MEANING -3

Radio is a device which converts electromagnetic waves into sound waves. At start radio used to have a big

box like shape but now it can easily fit into your pocket or be fixed in your mobile phone.

19TH CENTURY---INVENTIONS:

An unending effort to invent & improve means of communication.

SR.

ERA

SCIENTIST

PLACE

INVENTION

NO.

ALEXANDER

1847-1922

GRAHAM BELL

CANADA

TELEPHONE.

EMILE

DISK RECORD

1851-1929

BERLINER

GERMANY

GRAMOPHONE

1899-1985

LASZLO BIRO

HUNGRY

BALLPEN(BIRO)

LOUIS

BRAILLE WRITING

1809-1852

BRAILLE

FRANCE

SYSTEM

THOMAS

MOTION PICTURE

1847-1931

EDISON

USA

PROJECTOR

HISTORY OF RADIO:

1- STORY STARTS IN 1820

It was observed that,

ELECTRICITY AND MAGNET BOTH CAN ATTRACT AND REPEL OBJECTS

This observation led scientists to a series of experiments which finally made the invention of radio possible

through the discovery of electromagnetic waves.

2- 1820---HANS CHRISTEN ORSTED--performed an experiment on man-made electric current

and magnetism.

He demonstrated that a wire, carrying electricity was able to deflect a magnetized compass needle.

3- ANDRE MARIE AMPERE

Greatly influenced by Hans' experiment, Andre proposed The Theory of Electromagnetism. Scientists

came to know that controlled electromagnetic waves could do wonders.

4- 1831- MICHEAL FARADAY----

Discovered Electromagnetic Induction.

5- 1861-65-- JAMES CLERK MAXWELL--

Did successful experiments with electromagnetic waves.

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6- JULY 30, 1872--

Maxwell wrote a paper to royal society, titled:

"A DYNAMICAL THEORY OF ELECTROMAGNETIC FIELD."

He was 1st to describe the theoretical basis of the propagation of electromagnetic waves.

7- 1878-- DAVID E. HUGHS-----

He was the first to transmit and receive radio waves when he noticed noise in his home-made telephone

receiver with electromagnetic waves.

8- 1886-1888----HEINRICH HERTZ----

Validated Maxwell's theory. Hertz proved, radio radiation was a kind of waves---

hence the waves are

called "Hertzian waves".

"BEGINNING OF WIRELESS RADIO" (WIRELESS TELEGRAPHY)

1- 1893 ST. LOUIS TESLA

At St. Louis Missouri Tesla gave a public demonstration of wireless radio communication.

2- AUG.19, 1894 .SIR OLIVER LODGE

British physicist demonstrated the reception of "morse code signaling'' using radio waves.

3- NOV. 1894, JAGDISH CHANDRA BOSE

Demonstrated the radio waves in Kolkata, India.

4- MAY 7, 1895. ALEXENDER POPOV

Popov, a Russian physicist, demonstrated publicly the transmission and reception of radio waves used for

radio communication at the Russian physical and chemical society. The day is now celebrated as radio day in

Russia.

MARCONI THE INVENTOR

Name--------------------------Guglielmo Marches Marconi

Date of birth ---------------25th April 1874--- Italy

Father -------------------------lawnmower

Profession ------------------ electrical engineer

Nobel laureate ------------- for developing a practical wireless telegraphy system--radio

The system got widespread use throughout the world and Marconi was credited "the father of the radio".

ACHIEVEMENTS

1896----- Salisbury plains England ------Marconi demonstrated the transmission& reception of radio signals

over two miles.

1896 ------ Marconi was awarded a patent for radio with British patent 12039.

13 may, 1897 -------Marconi made a wireless transmission across water--- from Laver Lock point to Flat

Holm, Island

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July 1897 formed the Marconi telegraph trading Signal Company-- later renamed "the Marconi wireless

telegraph company"

1898  Established world's 1st wireless factory in Hall Street, Chelmsford England.

1901 Built a station at Massachusetts.

12th Dec.1901  Marconi received the 1st transatlantic radio signal at Signal Hill Newfoundland Canada.

1903-------The Marconi Company was carrying regular transatlantic

news

transmission.

Marconi sent 1st message from U.S.A.'s president to the king of U.K

2ND WORLD WAR

Marconi was in charge of the Italian wireless service and he developed short wave secret communication

transmission during the war.

20th July 1937 Marconi died of heart attack. Radio stations throughout the world observed two

minutes' silence.

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