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3-47. When using the two-tone test
(trapezoidal method) to check a
transmitter, you should see what pattern
on the oscilloscope?
1. A series of fully modulated sine
waves
2. A 100% amplitude-modulated signal
3. Two pulses of equal amplitude and
duration
4. Two opposing triangles that are
mirror images of each other
3-48. Frequency deviation of an fm signal is
usually expressed in which of the
following units of measurements?
1. Kilohertz
2. dB
3. dBm
4. Volts
3-49. What limits an fm transmitter’s
maximum frequency deviation?
1. The width of the band assigned for
station operation
2. The maximum power output rating of
the transmitter
3. The distortion that occurs at 100%
modulation
4. The transmitting antenna height
3-50. Spectrum analysis is a graphic plot of
1. amplitude versus time
2. time versus frequency
3. amplitude versus frequency
4. amplitude versus power
3-51. Time-domain plots are used by
technicians to graphically view which of
the following waveform parameters?
1. Amplitude versus time
2. Frequency versus time
3. Frequency versus distance
4. Amplitude versus power
3-52. Frequency-domain plots are used by
technicians to graphically view which of
the following waveform parameters?
1. Amplitude versus time
2. Amplitude versus frequency
3. Frequency versus distance
4. Amplitude versus power
3-53. Which of the following pieces of test
equipment should you use to determine
what signals make up a complex signal?
1. Oscilloscope
2. Sweep oscillator
3. Spectrum analyzer
4. Time-domain reflectometer
3-54. At 100% amplitude modulation, the total
power in the sidebands equals what
percentage of the carrier power?
1. 6%
2. 50%
3. 66%
4.
100%
3-55. When viewing a 100% amplitude-
modulated signal with a spectrum
analyzer, what type of display should you
observe?
1. A center frequency and both the
upper and lower sidebands 6 dB down
from the center frequency
2. A center frequency and both the
upper and lower sidebands of equal
amplitude
3. A center frequency that is -6 dB down
from both the upper and lower
sidebands
4. A suppressed carrier with both the
upper and lower sidebands of equal
amplitude
