VHF-DSC Equipment & Operation:
Subelement A
Section 10
Antenna Systems:
It becomes necessary to construct a temporary VHF marine antenna. What should be the approximate length of the antenna?
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10 inches
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12 inches
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15 inches
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Correct Answer18 inches
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Which of the following best describes a VHF collinear array?
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Correct AnswerAn antenna with phased elements, omni directional radiation pattern, offering up to 9 db gain.
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The cascade filters in the VHF radio's IF section.
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A shoreside directional VHF yagi antenna.
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A depth sounder phased array transducer.
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A masthead antenna with a base loading coil appears shorted to an ohmmeter check. What might this indicate?
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Positive proof of shorted coaxial cable plugs.
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Correct AnswerMay be normal for a well working shunt fed antenna system.
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Immediately repair both upper and lower PL-259s.
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No VHF antenna should measure a short circuit.
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What is the most common type of coax connector used on VHF transceivers?
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"N"
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"BNC"
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Correct Answer"UHF"
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"TNC"
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What type of coaxial cable would be most appropriate for a long transmission line run?
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"RG-58/U"
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"RG-59/U"
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Correct Answer"RG-8/U"
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"RG-174/U"
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What is a disadvantage when using high gain VHF antennas?
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Poor horizontal radiation pattern.
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Very high radiation pattern.
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Very low radiation pattern.
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Correct AnswerSignal dropout in severe weather on small craft.
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