-In 1895, a young Italian named Gugliemo Marconi invented “the wireless telegraph” while experimenting in his parents' attic.
-He used radio waves to transmit Morse code and the instrument he used became well-known as the radio.
-The history of the radio, or wireless telegraph, dates back more than a century. -Advancements over time, including voice transmissions, have led to the radios that exist today.
-Early radio communications were limited to simple Morse Code transmissions. Examples are television and radio broadcasts
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FACT on the ra ly l a g e . l e FCC m th o r f e icens in a l obta History (cont.)
● Henirich Hertz- German Physicist who discovered that you could transmit and receive electric waves wirelessly.
● Nikola Tesla- Serbian-American inventor who discovered the basis for most alternating-current machinery.
○ Also invented the Tesla Coil
Ernst Alexanderson- Swedish scientist who developed the first alternator to make transmission of speech possible.
How the Radio Works
A part of the radio called the transmitter sends off an electrical wave that may travel across the world to a receiver.
Turning the knob on the radio extend or retract the antenna that catches electromagnetic waves that let you pick different stations.
Amplitude Modulation ( AM ) combines audio and radio frequencies to match audio signals while Frequency Modulation ( FM ) combines the frequencies to create a new audio signal.
First radio stations
1920- KDKA was a major operating radio station, it remains a benchmark in most accounts.
By 1922- 600 radio stations had sprung up around the United States.
1921- Chicago's first radio station, KYW begun,it was the first specialized radio station, broadcasting exclusively opera six days a week. The radio station experienced immediate popularity. Began broadcasting things like popular music, classical music, sporting events, lectures, fictional stories, newscasts, weather reports, market updates, and political commentary.
Enhanced a sense of community among different ethnic groups as each group could listen to programming suited to their interests and needs.
- The transmission across the Atlantic achieved by Guglielmo and his assistants was in the form of Morse Code, tapping out the letter "S,". The first voice transmission occurred on December
- Canadian engineer Reginald Fessenden became convinced that the "wireless telegraph" could transmit Morse Code and the human voice.
Significance of the Radio
-The radio was the first form of wireless communication
-Military uses it to communicate with other troops and ships
-It allows ship captains to stay in touch with shore and call for help in emergency situations
- People can listen to news as it happens Design
Radios consist of many specialized electronic circuits designed to perform specific tasks—radio frequency amplifier, mixer, variable frequency oscillator, intermediate frequency amplifier, detector, and audio amplifier. Aircraft radio circuit
- A radio consists of an antenna, printed circuit board, resistors, capacitors, coils and transformers, transistors, integrated circuits, and a…