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Subel. G
A
42 questions
B
36 questions
C
30 questions
D
48 questions
E
60 questions
F
36 questions
G
48 questions
6 questions
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Subelement G
VHF-DSC Equipment & Comms:
Section 44
VHF: Power and Range:
44G1
Which of the following control selections may result in limited receiving range?
A.
Setting the squelch control to its minimum level.
Correct Answer
B.
Setting the squelch control to its
maximum
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.
44G1
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44G2
While conducting routine communications using the wheelhouse VHF with a station 1 mile distant, your recommended power setting would be:
A.
25 watts after dark.
B.
25 watts during a clear sunny day.
Correct Answer
C.
1 watt, day or night.
D.
1 watt using DSC at night.
44G2
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44G3
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.
C.
Vessel antenna height.
Correct Answer
D.
Ionospheric
refraction
.
44G3
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44G4
Much longer than normal VHF transmissions are typically caused by:
Correct Answer
A.
Atmospheric
ducting
or
tropospheric
propagation
.
B.
Changing power from 1W to 25 W.
C.
Skywave reflections from the D layer.
D.
Ionospheric activity in layers F1/F2.
44G4
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44G5
Describing VHF transmissions as "line of sight" does not mean:
A.
Vessel antenna height will not affect the radius of propagation.
B.
The normal transmission range to a coast station is approximately is 10 NM.
C.
Coast station antenna height has no effect on the radius of transmission.
Correct Answer
D.
VHF
communications
are effective
only
with
nearby
stations within
visual
range of the
bridge
.
44G5
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44G6
The effectiveness of VHF communications is maximized by:
Correct Answer
A.
Appropriate setting of the transmitter power, selecting an appropriate channel & adjustment of squelch for maximum receiver sensitivity.
B.
The adjustment of squelch for maximum receiver sensitivity, setting transmitter power to 1W & selecting an appropriate channel.
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.
44G6
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