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Subel. A
A
60 questions
B
72 questions
C
60 questions
D
24 questions
E
24 questions
F
36 questions
G
24 questions
6 questions
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2
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10
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Subelement A
VHF-DSC Equipment & Operation:
Section 10
Antenna Systems:
10A1
It becomes necessary to construct a temporary VHF marine antenna. What should be the approximate length of the antenna?
A.
10 inches
B.
12 inches
C.
15 inches
Correct Answer
D.
18
inches
10A1
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10A2
Which of the following best describes a VHF collinear array?
Correct Answer
A.
An antenna with phased
elements
,
omni
directional
radiation
pattern
,
offering
up to
9
db
gain
.
B.
The cascade filters in the VHF radio's IF section.
C.
A shoreside directional VHF yagi antenna.
D.
A depth sounder phased array transducer.
10A2
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10A3
A masthead antenna with a base loading coil appears shorted to an ohmmeter check. What might this indicate?
A.
Positive proof of shorted coaxial cable plugs.
Correct Answer
B.
May
be
normal
for a
well
working
shunt
fed
antenna
system
.
C.
Immediately repair both upper and lower PL-259s.
D.
No VHF antenna should measure a short circuit.
10A3
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10A4
What is the most common type of coax connector used on VHF transceivers?
A.
"N"
B.
"BNC"
Correct Answer
C.
"
UHF
"
D.
"TNC"
10A4
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10A5
What type of coaxial cable would be most appropriate for a long transmission line run?
A.
"RG-58/U"
B.
"RG-59/U"
Correct Answer
C.
"RG-8/U"
D.
"RG-174/U"
10A5
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10A6
What is a disadvantage when using high gain VHF antennas?
A.
Poor horizontal radiation pattern.
B.
Very high radiation pattern.
C.
Very low radiation pattern.
Correct Answer
D.
Signal
dropout
in
severe
weather
on
small
craft
.
10A6
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