1-57.
Outputs 24-bit data words to the security
equipment via the SGS computer.
1 . A
2 . B
3 . C
4 . D
1-58.
Multiplexes and modulates parallel data
into audio tones.
1 . A
2 . B
3 . C
4 . D
1-59.
Receives the audio tone package from the
data terminal set and transmits the tones.
1 . C
2 . D
3 . E
4 . F
1-60.
Demodulates the audio tones and checks
the six hamming bits for transmission
errors.
1 . A
2 . B
3 . C
4 . D
1-61.
Decrypts the 24-bit data word and sends it
to the CDS computer.
1 . A
2 . B
3 . C
4 . D
1-62.
Which of the following functions is
performed by an antenna coupler?
1. Amplification of the HF radio signal
2. Impedance matching of the antenna
and the radio set
3. Conversion of atmospheric
electromagnetic energy to RF current
4. Coupling of the data terminal set to
the radio
1-63.
The size of an antenna is determined by
which of the following factors?
1. The operating power
2. The operating frequency
3. The range of the receiver
4. The type of data being transmitted
1-64.
The frequency range of an antenna can be
extended by adding which of the
following factors?
1. A resistive load only
2. A capacitive load only
3. An inductive load only
4. Either a capacitive or an inductive
load
1-65.
Which of the following functions is NOT
performed by the data terminal set?
1. Generating the radio key-line signal
2. Converting digital data to audio tones
3. Encrypting CDS computer data
4. Converting audio tones to digital data
1-66.
The data terminal set communicates with
the radio set via which of the following
devices?
1. The communications switchboard
2. An antenna coupler
3. The cryptographic device
4. The SGS computer
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