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Subelement G
VHF-DSC Equipment & Communications:
Section 49
VHF Controls, Power and Range:
Which of the following control selections may result in limited receiving range?
  • Correct Answer
    Setting the squelch control to its maximum level.
  • Setting the squelch control to its minimum level.
  • The power switch is set to the "high" output position, resulting in receiver overloading.
  • Setting the channel selection switch midway between channels 6 and 16.
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At mid-day, what would be the best choice in attempting to communicate with a shore station 15 miles distant?
  • 16 MHz band
  • Correct Answer
    156-164 MHz band
  • 12 MHz band
  • 22 MHz band
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Which of the following factors does not normally affect the range of VHF transmissions?
  • Salt water ingress into the antenna coaxial cable.
  • Power level setting.
  • Correct Answer
    Ionospheric refraction.
  • Vessel antenna height.
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Much longer than normal VHF communications distances are typically caused by:
  • Changing power from 1W to 25 W.
  • Skywave reflections from the D layer.
  • Ionospheric activity in layers F1/F2.
  • Correct Answer
    Atmospheric ducting or tropospheric propagation.
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Describing VHF transmissions as "line of sight" does not mean:
  • Correct Answer
    VHF communications are effective only with nearby stations within visual range of the bridge.
  • Vessel antenna height will not affect the radius of propagation.
  • The normal transmission range to a coast station is approximately is 10 NM.
  • Coast station antenna height has no effect on the radius of transmission.
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The effectiveness of VHF communications is maximized by:
  • The adjustment of squelch for maximum receiver sensitivity, setting transmitter power to 1W & selecting an appropriate channel.
  • Correct Answer
    Appropriate setting of the transmitter power, selecting an appropriate channel & adjustment of squelch for maximum receiver sensitivity.
  • Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity & setting transmitter power to 1W.
  • Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity, setting transmitter power to 25W.
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