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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


Lecture 65

Radio Communication


Radio transmission

  • 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

Radio transmission1

  • 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

Radio transmission2

  • FM Radio: particular radio frequency.

  • 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


  • Until about 1950, human operators were particular radio frequency.

  • 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.



  • 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.