pawar parasharam radio AIR

1. Unit-01: Growth of Radio
Lecture-01: What is Radio? Evolution of Radio

2. Out come of the unit: Recall1 growth of Radio
Sub Topic:What is Radio? Evolution of Radio
Objective:At the end of this sub topic students will able to
-The concept of ‘Radio’
-History of of radio
-Need and importance of radio in human life

3. -The transmission and reception of electromagnetic waves of radio
frequency
- Radio, sound communication by radio waves.
- The radio receives electromagnetic waves from the air that
are sent by a radio transmitter.
- The radio receives electromagnetic waves from the air that
are sent by a radio transmitter.

4. -
-Electromagnetic waves are a combination of electrical and magnetic
fields that overlap.
-The radio converts these electromagnetic waves, called a signal
into sounds that humans can hear.
-The wireless transmission and reception of
electric impulses or signals by means of
electromagnetic waves
-The use of these waves for the wireless
transmission of electric impulses into which
sound is converted

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- 1901 - A radiotelegraph service was instituted between five hawaiian islands
- 1903 - A Marconi station located at Wellfleet, Massachusetts carries an
exchange between President Theodore Roosevelt and King Edward VII
-1905 - The naval battle of Port Arthur in the Russo-Japanese war was reported
by wireless
-1906 - The US Weather Bureau experiment with radiotelegraphy to speed up
notice of weather conditions
-1909 - Robert E. Peary, Arctic explorer, radio telegraphed : “I found the Pole”
-1912 - The first Transpacific radiotelegraph service is linked between San Francisco
and Hawaii

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In 1919, after the
government released
its control of all patents,
the Radio Corporation of
America (RCA) was
established with the
purpose of distributing
control of the radio
patents that had been
restricted during the war

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Reference:
Radio in New Avtaar (AM to FM)
Dr. Ambrish Saxena