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ASSIGNMENT 2
Textbook assignment: Chapter 2, “Angle and Pulse Modulation,” pages 2-1 through 2-64.
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2-1. Frequency-shift keying resembles what
type of AM modulation?
1. CW modulation
2. Analog AM modulation
3. Plate modulation
4. Collector-injection modulation
2-2. Frequency-shift keying is generated using
which of the following methods?
1. By shifting the frequency of an
oscillator at an af rate
2. By shifting the frequency of an
oscillator at an rf rate
3. By keying an af oscillator at an rf rate
4. By keying an af oscillator at an af rate
2-3. In a frequency-shift keyed signal, where is
the intelligence contained?
1. In the duration of the rf energy
2. In the frequency of the rf energy
3. In the amplitude of the rf energy
4. In the spacing between bursts of rf
energy
2-4. If an fsk transmitter has a MARK
frequency of 49.575 kilohertz and a
SPACE frequency of 50.425 kilohertz,
what is the assigned channel frequency?
1. 49 kilohertz
2. 49.575 kilohertz
3. 50 kilohertz
4. 50.425 kilohertz
2-5. Fsk is NOT affected by noise interference
for which of the following reasons?
1. Noise is outside the bandwidth of an
fsk signal
2. Fsk does not rely on the amplitude of
the transmitted signal to carry
intelligence
3. The wide bandwidth of an fsk signal
prevents noise interference
4. Each of the above
2-6. In an fsk transmitter, what stage is keyed?
1. The oscillator
2. The power supply
3. The power amplifier
4. The buffer amplifier
2-7. When the amount of oscillator frequency
shift in an fsk transmitter is determined,
which of the following factors must be
considered?
1. The number of buffer amplifiers
2. The transmitter power output
3. The frequency multiplication factor for
the transmitter amplifiers
4. The oscillator rest frequency
2-8. In an fsk transmitter with a doubler and a
tripler stage, the desired frequency shift is
1,200 hertz. To what maximum amount is
the oscillator frequency shift limited?
1. 60 hertz
2. 100 hertz
3. 120 hertz
4. 200 hertz
