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Subel. G
A
36 questions
B
36 questions
C
48 questions
D
48 questions
E
60 questions
F
60 questions
G
12 questions
H
48 questions
I
126 questions
J
126 questions
6 questions
49
50
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49
50
Subelement G
VHF-DSC Equipment & Communications:
Section 49
VHF Controls, Power and Range:
49G1
Which of the following control selections may result in limited receiving range?
Correct Answer
A.
Setting the squelch control to its
maximum
level.
B.
Setting the squelch control to its minimum level.
C.
The power switch is set to the "high" output position, resulting in receiver overloading.
D.
Setting the channel selection switch midway between channels 6 and 16.
49G1
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49G2
At mid-day, what would be the best choice in attempting to communicate with a shore station 15 miles distant?
A.
16 MHz band
Correct Answer
B.
156-164 MHz band
C.
12 MHz band
D.
22 MHz band
49G2
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49G3
Which of the following factors does not normally affect the range of VHF transmissions?
A.
Salt water ingress into the antenna coaxial cable.
B.
Power level setting.
Correct Answer
C.
Ionospheric
refraction
.
D.
Vessel antenna height.
49G3
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49G4
Much longer than normal VHF communications distances are typically caused by:
A.
Changing power from 1W to 25 W.
B.
Skywave reflections from the D layer.
C.
Ionospheric activity in layers F1/F2.
Correct Answer
D.
Atmospheric
ducting
or
tropospheric
propagation
.
49G4
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49G5
Describing VHF transmissions as "line of sight" does not mean:
Correct Answer
A.
VHF
communications
are effective
only
with
nearby
stations within
visual
range of the
bridge
.
B.
Vessel antenna height will not affect the radius of propagation.
C.
The normal transmission range to a coast station is approximately is 10 NM.
D.
Coast station antenna height has no effect on the radius of transmission.
49G5
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49G6
The effectiveness of VHF communications is maximized by:
A.
The adjustment of squelch for maximum receiver sensitivity, setting transmitter power to 1W & selecting an appropriate channel.
Correct Answer
B.
Appropriate setting of the transmitter power, selecting an appropriate channel & adjustment of squelch for maximum receiver sensitivity.
C.
Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity & setting transmitter power to 1W.
D.
Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity, setting transmitter power to 25W.
49G6
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