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Subel. D
A
60 questions
B
72 questions
C
60 questions
D
24 questions
E
24 questions
F
36 questions
G
24 questions
6 questions
33
34
35
36
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36
Subelement D
Other GMDSS Equipment:
Section 36
Navtex:
36D1
Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?
A.
490 kHz
Correct Answer
B.
518
kHz
C.
2187.5 kHz
D.
4209.5 kHz
36D1
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36D2
The NAVTEX is powering on and appears to be functioning normally except there have been no new messages for an extended period. The station settings are correct. What is the most likely source of the problem?
A.
The audio amplifier is defective.
B.
The wrong frequency has been selected.
Correct Answer
C.
The
RF
amplifier at the
antenna
base
is defective.
D.
The DC supply voltage is too low.
36D2
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36D3
How is a NAVTEX receiver programmed to reject certain messages?
A.
The transmitting station's two-digit identification can be entered to de-select reception of its broadcasts.
B.
By entering the SELCALL of the transmitting station.
C.
By pressing "00" in the transmitter's ID block.
Correct Answer
D.
By
choosing
a
message
category
's
single
letter
(A-Z)
identifier
and
then
deselecting or
deactivating
.
36D3
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36D4
How can reception of certain NAVTEX broadcasts be prevented?
Correct Answer
A.
The receiver
can
be
programmed
to
reject
certain
stations and
message
categories
.
B.
Stations are limited to daytime operation only.
C.
Coordinating reception with published broadcast schedules.
D.
Automatic receiver desensitization during night hours.
36D4
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36D5
How is accuracy insured in NAVTEX broadcasts?
A.
A parity check character is sent at the end of each line.
B.
Each message is retransmitted.
C.
Selective FEC is used to prevent errors.
Correct Answer
D.
Each character is sent
twice
with a
time
interval
.
36D5
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36D6
NAVTEX broadcasts are sent:
Correct Answer
A.
In
categories
of
messages
indicated
by a
single
letter
or
identifier
.
B.
Immediately following traffic lists.
C.
On request of maritime mobile stations.
D.
Regularly, after the radiotelephone silent periods.
36D6
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