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Subelement 7
Radio Wave Propagation
Section 7-01
line of sight, ground wave, ionospheric wave (sky wave)
What type of propagation usually occurs from one hand- held VHF transceiver to another nearby?
  • Tunnel propagation
  • Sky-wave propagation
  • Auroral propagation
  • Correct Answer
    Line-of-sight propagation
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How does the range of sky-wave propagation compare to ground- wave propagation?
  • It is much shorter
  • It is about the same
  • It depends on the weather
  • Correct Answer
    It is much longer
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When a signal is returned to earth by the ionosphere, what is this called?
  • Tropospheric propagation
  • Ground-wave propagation
  • Correct Answer
    Sky-wave propagation
  • Earth-moon-earth propagation
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How are VHF signals propagated within the range of the visible horizon?
  • Correct Answer
    By direct wave
  • By sky wave
  • By plane wave
  • By geometric wave
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Skywave is another name for:
  • Correct Answer
    ionospheric wave
  • tropospheric wave
  • ground wave
  • inverted wave
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That portion of the radiation which is directly affected by the surface of the earth is called:
  • tropospheric wave
  • ionospheric wave
  • inverted wave
  • Correct Answer
    ground wave
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At HF frequencies, line-of-sight transmission between two stations uses mainly the:
  • troposphere
  • skip wave
  • ionosphere
  • Correct Answer
    ground wave
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The distance travelled by ground waves:
  • depends on the maximum usable frequency
  • is more at higher frequencies
  • Correct Answer
    is less at higher frequencies
  • is the same for all frequencies
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The radio wave which follows a path from the transmitter to the ionosphere and back to earth is known correctly as the:
  • F layer
  • surface wave
  • Correct Answer
    ionospheric wave
  • skip wave
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Reception of high frequency (HF) radio waves beyond 4000 km is generally possible by:
  • ground wave
  • Correct Answer
    ionospheric wave
  • skip wave
  • surface wave
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