1. . . .
Vocabulary
to contain - ,
to couple ,
to polarize
to separate - ()
coupled circuits -
contact terminal -
constant and variable current
separation energy
voice frequency
channel -
pole ;
source
separate
voice -
unlike poles -
channel capacity -
constant current -
coupling resistance -
coupling dimensions -
VOICE-FREQUENCY-TELEGRAPH EQUIPMENT
Amplifiers can be supplied either with triodes or with constant or variable pentodes. The equipment contains oscillators, modulators, filters, amplifiers, and amplitude limiters. Usually separate amplifiers are provided for each channel.
As for the amplitude limiters, they are mostly used in one-source fluency-modulated equipment. The oscillators contain either electron valves or transistors. Modulators used in the equipment are of the usual type.
As for the amplifiers, they are transformer-coupled ones. The modulators used in the equipment are relay modulators with polarized telegraph relays. The filters are the so-called differential ones. The modulators combine diode circuits and oscillators.
Questions
1) What devices does the voice-frequency-telegraph equipment contain?
2) What elements do the equipment oscillators contain?
3) How many modulators are they designed to supply?
4) What type modulators are used in the equipment?
5) What parts do FM modulators combine?
6) What types of filters does the equipment contain?
7) What type amplifiers are used in it?
8) What elements may the amplifiers be supplied with?
9) In what way are channels provided with amplifiers?
10) What type equipment is supplied with amplitude limiters?
Task 2. Translate and write down the following words and word combinations in your workbooks. Make up a short plan of the text "VOICE-FREQUENCY-TELEGRAPH EQUIPMENT " and write it down in your workbooks, summarize the text in short.
2. . , .
Short theoretical information and a sample of implementation
( )
there is (there are)
there is/there are , . Are Is?
Are , .
Is , .
|
|
|
:
There + to be + + .
There + is + a modulator + in the equipment.
There + are + many oscillators + in the modulators.
Choose the correct variant. .
- There _____ a contact terminal in the equipment.
wasnt
weren't - There _____ many elements in amplifiers.
is
are
- There _____ no constant current in the transistor, Im afraid.
is
are - There will _____ some interesting information at the conference.
is
are
be
to be - There _____ many websites on the Internet.
are
is - There _____ parts in FM modulators.
is many
are much
is much
are many
Translate the following words and word combinations in written form.
.
Words
constant ____________________
differential__________________
diode ______________________
triode ______________________
pentode ____________________
Word combinations
amplitude limiters_________________________________________
electron valves _________________________________________
variable pentode__________________________________________
reliable source of knowledge ________________________________
source of supply___________________________________________
transformer-coupled amplifier________________________________
polarized telegraph relays___________________________________
one-source equipment______________________________________
Fill in the tables. Follow the models.
.
(Model):
| verb () | noun () |
| to press | press |
| to supply - | |
| to couple - |
(Model):
| action () | process () | quality () |
| to mobilize - | mobilization - | mobilizable - |
| to separate - | ||
| to vary - | ||
| to polarize - |
(Model):
| doer () | action () |
| amplifier - | to amplify - |
| container - | |
| limiter - | |
| provider - | |
| separator - | |
| combiner - |
Task 3. Prepare a presentation of the topic VOICE-FREQUENCY-TELEGRAPH EQUIPMENT: make up slides about the topic VOICE-FREQUENCY-TELEGRAPH EQUIPMENT, write down the material of the slides in your workbooks, prepare your report (presentation) for the demonstration it in the lecture-room.
3. : , , () .
4. 4. Unit 1.4. RADIOTELEGRAPH
1.4.
