3-41.
3-42.
3-43.
3-44.
3-45.
The DTS performs which of the
following functions?
1.
Data encryption
2.
Error detection and
correction
3.
Track gridlock
4.
Transmitting data tones on a
carrier frequency
The six hamming bits added to
the data word enables the DTS
to correct what maximum number
of data bits?
1.
One
2.
Two
3.
Three
4.
Four
The DTS is operating in the
detect and correct mode. A
data word is received by the
CDS computer with bit 24=0, and
bit 25=1. Which of the
following conditions is
indicated by this bit
combination?
1. No errors detected
2.
Parity error(s) detected
3.
Odd bit error(s) detected,
correction attempted
4.
Even errors detected, no
correction attempted
The DTS develops a composite
signal consisting of what total
number of frequency division
multiplexed audio-frequency
tones?
1.
2
2. 11
3. 16
4. 30
Bits 4 and 5 of a 30-bit data
word are carried by which of
the following audio tone
frequencies?
1.
935 Hz
2.
1155 Hz
3.
1265 Hz
4.
1705 Hz
3-46.
3-47.
3-48.
3-49.
3-50.
3-51.
What is the basic unit of the
Link-11 transmission?
1. Bit
2. Tone
3. Frame
4. Doppler
In a single frame, the DTS can
tolerate what maximum phase
shift error without generating
an error code?
1.
+ 44 degrees only
2.
- 44 degrees only
3.
± 44 degrees
4.
±135 degrees
A phase-shift error of +105
degrees in any one of the data
tones will cause a single bit
to be erroneous.
1. True
2.
False
Which of the following Link-11
signals allows the receiving
unit to correct errors caused
by the relative motion between
the sending and receiving
units?
1.
Sync tone
2.
Doppler tone
3.
Data carrying tones
4. Motion correct tone
During the preamble, the
2915-Hz tone sets which of the
following references?
1.
Frame timing when the DTS is
in corrected timing
2.
Signal power levels when the
DTS is in corrected timing
3.
Frame timing when the DTS is
in stored timing
4.
Signal power levels when the
DTS is in stored timing
During the reception of the
data segment of a Link-11
message, the 605-Hz Doppler
tone should be at which of the
following power levels?
1.
+12 dB
2.
+ 6 d B
3.
- 6 d B
4.
0 dB
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