1. . . .
Vocabulary
to apply ,
to occupy ,
to retain ,
vice versa -
application of modern techniques -
applicable theory
applied sciences
occupational problems
insulating tape -
case -
in case of -
important - ,
importance - ,
kind - , ,
picture ,
to transfer ,
to wind (wound)
winding -
as follows
any
except -
main line -
wire winding -
wire wound on a core - ,
various forms of energy except kinetic -
pictures of any kind -
RADIO TRANSMITTER
Radio communication is the transfer of high-frequency energy from the transmitter to the receiver. Accordingly, the main components of radio communication of any kind are a transmitter and a receiver.
The function of a transmitter is to generate electrical oscillations at radio frequency which is called the carrier frequency. The main components of a transmitter are an oscillator, amplifiers, and a transducer.
Their functions are as follows. The oscillator of a transmitter converts electric power into oscillations of definite radio frequency.
As for amplifiers, they increase the intensity of oscillations produced by the oscillator and retain the definite frequency. The transducer converts the information to be transmitted into a varying electrical voltage. In case of sound transmission a microphone serves as a transducer. And in case of picture transmission a photoelectric device serves as the transducer.
Other important components of radio transmitters are the modulator and the aerial. As for the modulators, they use proportional voltages for controlling the variations of oscillation intensity. And the aerial is that part of a radio system from which energy is transmitted into or received from the space (or the atmosphere).
The aerial must be insulated from the ground and may occupy vertical or horizontal position. In case the transmitter aerial occupies vertical position, the receiver aerial must be also vertical and vice versa. It applies to all radio frequencies except short waves. In usual amplitude-modulated broadcasting the receiver aerial may consist of a wire wound on a core.
Questions
1. How can radio transmission be defined?
2. What frequency is called radio frequency?
3. What component of a radio system serves to retain the definite frequency?
4. Which device converts the information to be transmitted into a varying electrical voltage?
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5. What device serves as a transducer in case of sound transmission?
6. What device serves as a transducer in case of picture transmission?
7. What positions can the aerial occupy?
8. What part of the receiver may consist of a wire wound on a core?
Task 2. Translate and write down the following words and word combinations in your workbooks. Make up a short plan of the text RADIO TRANSMITTER and write it down in your workbooks, summarize the text in short.
2. . ʻ , .
Short theoretical information and a sample of implementation
( )
to be
to be - ", ". , to be (.. ).
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He is an engineer.- . ( .)
Radio communication is the transfer of high-frequency energy. - .
, - , : (subject) + (verb) + (object)
I am a student. - . ( .)
A modulator and an aerial are important for radio transmitters. - ( ) .
Complete the sentences with "to be". "to be".
1. She _____ a computer programmer.
2. My colleagues _____ at work.
3. Radios, followed by televisions, record players, and tape recorders _____ the first devices for everyday use.
4. This device _____ large and uses a lot of power.
5. Microprocessors _____ used to control many household items.
6. Computer-controlled robots _____ developed.
Translate the following words and word combinations in written form.
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Words
horizon_______________________
horizontal_____________________
position ______________________
proportion____________________
theory_______________________
transducer____________________
irregular______________________
indicator______________________
increase______________________
impossible____________________
independence__________________
index_________________________
interval_______________________
inconvertible___________________
inspect________________________
inseparable____________________
internal_______________________
inconsiderable__________________
influence______________________
Word combinations
properties of oscillations retainable in any position___________________________________
devices of any kind except faulty ones_____________________________________________
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winding of any kind____________________________________________________________
the instruction ran as follows_____________________________________________________
Fill in the table. Follow the model.
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(Model):
| noun () | verb () |
| retention | to retain |
| application - | |
| occupation - | |
| insulation - |
Task 3. Prepare a presentation of the topic RADIO TRANSMITTER: make up slides about the topic RADIO TRANSMITTER, write down the material of the slides in your workbooks, prepare your report (presentation) for the demonstration it in the lecture-room.
3. ʻ: ʻ, , () .
6. 6. Unit 1.6. RADIO RECEIVER
1.6.
