1. Simple two-way radios, called walkie-talkies, have been popular children’s toys for years.

2. Wireless communications systems use devices called transmitters to generate radio waves.

3. Early transceivers were very large, but they have decreased in size due to advances in technology.

4. By 1995 the number of companies offered cell phones services had grown to over 1500 companies.

5. The transmitters change, or modulate, the radio waves.

6. Police, fire, and other emergency departments use two-way radio to communicate information between vehicles that are already responding to emergency calls, which saves valuable time.

Exercise 3. Rewrite and translate the sentences into Russian, define the degree of comparison (positive, comparative, superlative) of adjectives.

1. Wireless communications allow people greater flexibility while communicating.

2. Early transceivers were very large.

3. In 1878 the telephones were much more convenient and personal than telegrams.

4. Satellite communications services are more expensive than cellular or other wireless services.

5. The oldest commercial telephone line was installed in Boston.

6. Wireless technologies make communications services more readily available than traditional wire-based services (such as ordinary telephones), which require the installation of wires.

Exercise 4. Read the text and translate it into Russian.

Wireless Communications

    Wireless communications are various telecommunications systems that use radio waves to carry signals and messages across distances. Wireless communications systems use devices called transmitters to generate radio waves. A microphone or other mechanism converts messages, like sounds or other data, into electronic impulses. The transmitters change, or modulate, the radio waves so they can carry the impulses, and then transmit the modulated radio signals across distances. Radio receivers pick up these signals and decode them back into original messages.

   Commercial radio and television are also wireless telecommunications system, but radio and television are mainly public broadcast services rather than personal communications systems. Wireless communications allow people greater flexibility while communicating, because they do not need to remain at a fixed location, such as a home or office. Wireless technologies make communications services more readily available than traditional wire-based services (such as ordinary telephones), which require the installation of wires. This is useful in places where only temporary communications services are needed, such as at outdoor festivals or large sporting events. These technologies are also useful for communicating in remote locations, such as mountains, jungles, or deserts, where telephone service might not exist. Wireless services allow people to communicate while in a car, airplane, or other moving vehicle. Police, fire, and other emergency departments use two-way radio to communicate information between vehicles that are already responding to emergency calls, which saves valuable time. Construction and utility workers often use hand-held radios for short-range communication and coordination. Many businesspeople use wireless communications, particularly cellular radio telephones, to stay in contact with colleagues and clients while traveling.

     All wireless communications devices use radio waves to transmit and receive signals. These devices operate on different radio frequencies so that signals from one device will not overlap and interfere with nearby transmissions from other devices.

Exercise 5. Make and write the plan of the text .

Exercise 6. Put five questions to the text.

Exercise 7. Do the test

1. Telecommunications systems that use radio waves are called ….

a) wire communications systems

b) wireless communications systems

c) cable communications systems

2. …. converts messages into electronic impulses.

a) Transmitter b) Pager      c) Microphone

3. The transmitters … the radio waves so they can carry the impulses.

a) transform  b) limit         c) determine

4. Wireless communications devices operate on different ….

a) radio waves b) radio frequencies c) radio stations

5. Wireless technologies make communications services … than traditional-based services.

a) available    b) the most available c) more available

6. For short-range communication and coordination … are used.

 a) hand- held radios b) head-held radios c) phone radios

7. Wireless communications technologies are also useful for communicating in … locations.

 a) close        b) far           c) the nearest

8. Construction and utility workers …use hand-held radios for short-range communication and coordination.

      a) never         b) seldom        c) often

9. Radio receivers pick up these signals and decode … back into original messages.

     a) its              b) them         c) it

10. … technologies are also useful for communicating in remote locations, such as mountains, jungles, or deserts, where telephone service might not exist.

      a) this             b) that          c) these