EXERCISE 7
What significance do the following names have in relation to the text ‘Uses of radio’? Look at the example:
Radio broadcast – Before the advent of television, commercial radio broadcasts included news and music, dramas, comedies, variety shows, and many other forms of entertainment.
VHF AM
3 MHz to 30 MHz.
narrowband FM
INMARSAT and Iridium
geosynchronous satellites
66 Low Earth Orbit satellites
4.5 MHz in the NTSC system
a vestigial sideband
heating of objects
microgravity environments
radiation pressure
radio remote control
energy autarkic radio technology
Starwisp
Text V
Communications Satellites
EXERCISE 1
Read and translate the text. Insert necessary word combinations that are given into the gapped sentences of the text:
Communications satellites provide a means of ____ all over the globe, without the need for a network of wires and cables. They ___ Earth at a speed that enables them to stay above the same place on Earth at all times. This type of orbit is called geostationary or geosynchronous orbit because the satellite’s orbital speed operates in synchronicity with Earth’s ___. The satellites ___ transmissions from Earth and transmit them back to numerous Earth station receivers scattered within the receiving coverage area of the satellite. This relay function makes it ___ for satellites to operate as "bent pipes"—that is, wireless transfer stations for point-to-point and point-to-multipoint transmissions. Communications satellites are used by ___ to transmit signals across great distances. Ship, airplane, and land navigators also receive signals from ___ to determine geographic positions.
(Receive, satellites, orbit, transmitting telecommunications, rotation, telephone and television companies, possible)
EXERCISE 2
Answer the questions. Add information from the text to your answer.
What are the primary means for telephone connections?
What do you know about the coaxial cable?
For what purpose does the coaxial cable network include amplifiers?
What do fiber-optic cables use for transmission?
What are the advantages of fiber-optic technology?
What cables do new improvements promise for future?
How and for what purpose do radio waves travel?
What types of modulation can radio waves receive?
Why do microwaves can transmit larger amounts of data more efficiently then radio waves?
What are the characteristics of microwaves?
When are communications satellites used? Why is this type of communication more efficient?
UNIT IV
Достарыңызбен бөлісу: |
