3.
Some angle-modulated transmitters used in communication 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 values.
d.
create additional harmonics to synchronize other subsystems in the communications network.
4.
The subsystem in a radio communication system that amplifies and multiplies the angle-modulated signal
to the desired frequency and power level is called the
a.
c.
modulator.
b.
klystron.
d.
transmitter.
5.
The purpose of the multiplier stages in the transmitter shown in figure 106 is to increase the
a.
baseband frequency.
b.
modulated subcarrier's frequency.
c.
deviation of the modulated signal.
d.
frequency of the injection signal.
6.
The signals combined in each of the mixer stages of the transmitter shown in figure 109 are the
a.
modulated subcarrier signal and the injection signal.
b.
reflected power signal and the arc detector's signal.
c.
unmodulated subcarrier signal and the baseband signal.
d.
arc detector's signal and the modulated carrier signal.
7.
What happens when fault detection circuits sense a malfunction in a transmitter's RF system?
344 L3
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