LESSON 2
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.
Waveguides are capable of handling more power than a coaxial cable because-
A.
The distance of the arc-over path is twice as long
B.
The waveguides have less resistance than the coaxial line
C.
The waveguides have an inner coating of silver
D.
The waveguides do not use dielectric supports
2.
The primary purpose performed by the modulator in a satellite communications ground station is
conversion of-
A.
Baseband signals to modulated signals
B.
Modulated signals to baseband signals
C.
Beacon signals to modulated data signals
3.
Some angle-modulated transmitters used in satellite communications ground stations require several
multiplier stages. These multiplier stages are needed to-
A.
Provide the frequency required to indirectly modulate the subcarrier
B.
Raise the power level of the subcarrier oscillator output signals
C.
Increase the frequency deviation and the subcarrier oscillator frequencies to the desired value
D.
Create additional harmonics to synchronize other subsystems in the communications network
4.
What happens when fault detection circuits sense a malfunction in the transmitter's RF system?
A.
The antenna is disengaged from the transmitter
B.
The baseband signal is removed from the modulator
C.
The RF drive is removed from the high power amplifier
D.
The transmitter injection voltage is removed from the translator mixed stage
2-25
SS0031
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