The prime purpose of radio is to convey information from one place to another through the intervening media without wires. besides being used for transmitting sound and television signals, radio is used for the transmission of data in coded form. in the form of radar it is used also for sending out signals and picking up their reflections from objects in their path. long-range radio signals enable astronauts to communicate with the earth from the moon and carry information from space probes as they travel to distant planets. for navigation of ships and aircraft the radio range, radio compass and radio time signals are widely used. radio signals sent from global positioning satellites can also be used by special receivers for a precise indication of position. digital radio provides improved audio clarity and volume. various remote-control devices, including rocket and artificial satellite operations systems, are activated by radio signals. the development of the transistor and other microelectronic devices led to the development of portable transmitters and receivers. cellular and cordless telephones are actually radio transceivers, many telephone calls routinely are relayed by radio rather than by wires. some celestial bodies and interstellar gases emit relatively strong radio waves that are observed with radio telescopes composed of very sensitive receivers and large directional antennas. questions: i) what is the prime purpose of radio? 2) how can long-range radio signals be used in space? 3) what can radio signals activate‘.

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Евгения200605

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i went cookie

i went food

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i went tea

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