Subelement B
MF-HF-DSC-SITOR (NBDP) Equip. & Ops:
Section 22
Antenna Systems:
What is the purpose of the antenna tuner?
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Minimizes the carrier output.
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Maximizes the sidebands.
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Provides for maximum VSWR.
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Correct AnswerMatch the antenna to the operating frequency.
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What is the electrical effect of an inductance in series with the antenna?
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Correct AnswerIt electrically lengthens a physically fixed length antenna.
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It electrically shortens a physically fixed length antenna.
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It raises the resonant frequency of a physically fixed length antenna.
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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?
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It electrically lengthens a physically fixed length antenna.
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Correct AnswerIt electrically shortens a physically fixed length antenna.
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It lowers the resonant frequency of a physically fixed length antenna.
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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?
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RG-59, 72 ohm Coax
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RG-6, 72 ohm Coax
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Correct AnswerRG-8, 50 ohm Coax
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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?
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Rig a wire antenna 10 ft long from the antenna tuner to the highest vertical support.
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Rig a horizontal, center-fed dipole antenna 10 ft long to the antenna tuner.
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Correct AnswerRig a wire antenna approximately 35-40 ft long per the equipment instruction manual.
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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?
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"F" Connector
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"SMA" Connector
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"EIA-232" Connector
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Correct Answer"PL-259" Connector
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