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Subel. B
6 questions
Subelement B

MF-HF-DSC-SITOR (NBDP) Equip. & Ops:

Section 22

Antenna Systems:

What is the purpose of the antenna tuner?

  • Minimizes the carrier output.
  • Maximizes the sidebands.
  • Provides for maximum VSWR.
  • Correct Answer
    Match the antenna to the operating frequency.
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What is the electrical effect of an inductance in series with the antenna?

  • Correct Answer
    It electrically lengthens a physically fixed length antenna.
  • It electrically shortens a physically fixed length antenna.
  • It raises the resonant frequency of a physically fixed length antenna.
  • It increases the bandwidth of a physically fixed length antenna.
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What is the electrical effect of a capacitance in series with the antenna?

  • It electrically lengthens a physically fixed length antenna.
  • Correct Answer
    It electrically shortens a physically fixed length antenna.
  • It lowers the resonant frequency of a physically fixed length antenna.
  • It increases the bandwidth of a physically fixed length antenna.
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Which of the following coaxial cables is suitable for use in GMDSS MF/HF antenna systems?

  • RG-59, 72 ohm Coax
  • RG-6, 72 ohm Coax
  • Correct Answer
    RG-8, 50 ohm Coax
  • RG-179, 75 ohm Coax
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A ship's MF-HF whip antenna breaks off and is carried away in a storm. What would you do to regain operation on MF-HF GMDSS frequencies?

  • Rig a wire antenna 10 ft long from the antenna tuner to the highest vertical support.
  • Rig a horizontal, center-fed dipole antenna 10 ft long to the antenna tuner.
  • Correct Answer
    Rig a wire antenna approximately 35-40 ft long per the equipment instruction manual.
  • Connect the MF/HF transceiver to the VHF antenna.
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Which of the following connectors is often used in GMDSS MF/HF antenna systems?

  • "F" Connector
  • "SMA" Connector
  • "EIA-232" Connector
  • Correct Answer
    "PL-259" Connector
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