LESSON 3
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct answer
for each item. When you complete the exercise, check your answers with the answer key that follows. If you
answer any item incorrectly, study again that part of the lesson which contains the portion involved.
1.
When a receiving antenna is tracking a satellite, the noise picked up by the antenna varies in intensity as
the satellite moves from one horizon to the other. The maximum noise is picked up by the antenna when
the antenna is pointing at the-
A.
Sun
B.
Moon
C.
Milky Way
D.
Planet Venus
2.
What is gained by reducing the effective bandwidth in the 800-kHz IF signal?
A.
Reduction of noise power applied to the discriminator
B.
Increase of signal power applied to the discriminator
C.
Reduction in the C/N applied to the limiter
D.
Reduction in the frequency deviation of the FM signal applied to the limiter
3.
The number of voice channels normally processed through a receiver with a buffer amplifier G3 varies
from-
A.
1 to 5
B.
1 to 60
C.
5 to 24
D.
12 to 60
4.
What is the purpose of FMFB?
A.
To ensure maximum frequency deviation
B.
To minimize the noise content of the IF signal
C.
To provide regenerative feedback to the IF amplifiers
D.
To minimize the noise content of the received carrier signal
3-39
SS0031
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