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NIS – PHYSICAL SCIENCE

NIS – PHYSICAL SCIENCE. Lecture 6 5 Radio Communication Ozgur Unal. Name different forms of electronic communication. Radio Communication. The music and words you hear from a radio are sent to your radio by radio waves (EM waves). The metal antenna detects radio waves.

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NIS – PHYSICAL SCIENCE

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  1. NIS – PHYSICAL SCIENCE Lecture 65 Radio Communication OzgurUnal

  2. Name different forms of electronic communication Radio Communication

  3. The music and words you hear from a radio are sent to your radio by radio waves (EM waves). • The metal antenna detects radio waves. • As the EM waves pass by your radio’s antenna, the electrons in the metal vibrate  changing electric current • An amplifier boosts the current that contain the information about the music and words. • The current passing through the • electromagnet in the speaker causes • the speaker to vibrate. Radio Transmission

  4. Each radio station is assigned to broadcast at one particular radio frequency. • The specific frequency of the EM wave that a radio station is assigned is called the carrier wave. • The carrier wave is modified in order to carry the information of music and words. Radio Transmission • AM Radio: • An AM radio station broadcasts information by varying the amplitude of the carrier wave. • Frequencies range from 540,000 Hz • to 1,600,000 Hz

  5. FM Radio: • Electronic signals are transmitted by FM radio stations by varying the frequency of the carrier wave. • Because the strength of the FM waves • is kept fixed, FM signals tend to be more • clear than AM signals • Frequencies range from 88 million Hz • to 108 million Hz Radio Transmission

  6. Until about 1950, human operators were • needed to connect telephone calls between people. • Today, a cell phone uses radio signals for sending information to a tower at base station. • It uses another signal for receiving information from the base station. • The base stations are several kilometers apart. • The are a each one covers is called a cell. • If you move from one cell to another while using • your cell phone, an automated control station • transfers your signal to the new cell. Telephones

  7. Like a cellular telephone, a cordless telephone is a transceiver. • A transceiver transmits one radio signal and receives another radio signal from a base unit. • Having two signals at different frequencies allows you to talk and listen at the same time. • With a cordless telephone, you must • be close to the base unit. Telephones

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