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ELE3AH
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1992-01-26
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FCC TECHNICIAN Exam Question Pool. Subelement 3AH.
Signals and Emissions. 2 Questions.
---------------------------------------------------
3AH 1.1 A
What is the meaning of the term modulation?
A. The process of varying some characteristic of a carrier wave
for the purpose of conveying information
B. The process of recovering audio information from a received
signal
C. The process of increasing the average power of a single-
sideband transmission
D. The process of suppressing the carrier in a single-sideband
transmitter
3AH 2-1.1 A
If the modulator circuit of your FM transmitter fails, what
emission type would likely result?
A. An unmodulated carrier wave
B. An phase-modulated carrier wave
C. An amplitude-modulated carrier wave
D. A frequency-modulated carrier wave
3AH 2-1.2 B
What emission does not have sidebands resulting from modulation?
A. AM phone
B. Test
C. FM phone
D. RTTY
3AH 2-2.1 C
What is the FCC emission designator for a Morse code telegraphy
signal produced by switching the transmitter output on and off?
A. Test
B. AM phone
C. CW
D. RTTY
3AH 2-2.2 A
What is CW?
A. Morse code telegraphy using amplitude modulation
B. Morse code telegraphy using frequency modulation
C. Morse code telegraphy using phase modulation
D. Morse code telegraphy using pulse modulation
3AH 2-3.1 B
What is RTTY?
A. Amplitude-keyed telegraphy
B. Frequency-shift-keyed telegraphy
C. Frequency-modulated telephony
D. Phase-modulated telephony
3AH 2-3.2 A
What is the emission designation for telegraphy by frequency
shift keying without the use of a modulating tone?
A. RTTY
B. MCW
C. CW
D. Sideband phone
3AH 2-4.1 B
What emission type results when an on/off keyed audio tone is
applied to the microphone input of an FM transmitter?
A. RTTY
B. MCW
C. CW
D. Sideband phone
3AH 2-4.2 D
What is tone-modulated international Morse code telegraphy?
A. Telephony produced by audio fed into an FM transmitter
B. Telegraphy produced by an on/off keyed audio tone fed into
an CW transmitter
C. Telegraphy produced by on/off keying of the carrier amplitude
D. Telegraphy produced by an on/off keyed audio tone fed into
an FM transmitter
3AH 2-5.1 A
What is the emission designated as "MCW"?
A. Frequency-modulated telegraphy using audio tones
B. Frequency-modulated telephony
C. Frequency-modulated facsimile using audio tones
D. Phase-modulated television
3AH 2-5.2 D
In an ITU emission designator like A1A, what does the first
symbol describe?
A. The nature of the signal modulating the main carrier
B. The type of the information to be transmitted
C. The speed of the radiotelegraph transmission
D. The type of modulation of the main carrier
3AH 2-5.3 C
What emission type results when an on-off keyed audio oscillator
is connected to the microphone jack of an FM phone transmitter?
A. SS
B. RTTY
C. MCW
D. Image
3AH 2-6.1 A
In an ITU emission designator like F3B, what does the second
symbol describe?
A. The nature of the signal modulating the main carrier
B. The type of modulation of the main carrier
C. The type of the information to be transmitted
D. The frequency modulation index of a carrier
3AH 2-6.2 B
How would you transmit packet using an FM 2-meter transceiver?
A. Use your telegraph key to interrupt the carrier wave
B. Modulate your FM transmitter with audio tones from a terminal
node controller
C. Use your mike for telephony
D. Use your touch-tone (DTMF) key pad to signal in Morse code
3AH 2-7.1 D
What type of emission results when speaking into the microphone
of a 2-meter FM handheld transceiver?
A. Amplitude-modulated phone
B. Code telegraphy
C. An unmodulated carrier wave
D. Frequency-modulated phone
3AH 2-7.2 B
What emission type do most 2-meter FM transmitters transmit?
A. Interrupted pure carrier waves
B. Frequency-modulated phone
C. Single-sideband voice emissions
D. Amplitude-modulated carrier waves
3AH 2-8.1 C
What is the most important consideration when installing a
10-meter dipole inside an attic?
A. It will exhibit a low angle of radiation
B. The dipole must always be run horizontally polarized
C. It will be covered by insulation to prevent fire and
high enough to prevent being touched during transmission
D. Dipoles usually don't work in attics
3AH 2-8.2 D
Which type of transmitter will produce a frequency modulated
carrier wave?
A. A CW transmitter
B. An amplitude-modulation transmitter
C. A single-sideband transmitter
D. A phase-modulated transmitter
3AH 3.1 A
What is the term used to describe a constant-amplitude
radio-frequency signal?
A. An RF carrier
B. An AF carrier
C. A sideband carrier
D. A subcarrier
3AH 3.2 B
What is another name for an unmodulated radio-frequency
signal?
A. An AF carrier
B. An RF carrier
C. A sideband carrier
D. A subcarrier
3AH 4.1 C
What characteristic makes FM telephony especially well-suited
for local VHF/UHF radio communications?
A. Good audio fidelity and intelligibility under weak-signal
conditions
B. Better rejection of multipath distortion than the AM modes
C. Good audio fidelity and high signal-to-noise ratio above a
certain signal amplitude threshold
D. Better carrier frequency stability than the AM modes
3AH 5.1 D
What emission is produced by a transmitter using a reactance
modulator?
A. CW
B. Unmodulated carrier
C. Single-sideband, suppressed-carrier phone
D. Phase-modulated phone
3AH 5.2 C
What other emission does phase modulation most resemble?
A. Amplitude modulation
B. Pulse modulation
C. Frequency modulation
D. Single-sideband modulation
3AH 6.1 D
Many communications receivers have several IF filters that
can be selected by the operator. Why do these filters have
different bandwidths?
A. Because some ham bands are wider than others
B. Because different bandwidths help increase the receiver
sensitivity
C. Because different bandwidths improve S-meter readings
D. Because some emission types occupy a wider frequency
range than others
3AH 6.2 C
List the following signals in order of increasing bandwidth
(narrowest signal first): CW, FM voice, RTTY, SSB voice?
A. RTTY, CW, SSB voice, FM voice
B. CW, FM voice, RTTY, SSB voice
C. CW, RTTY, SSB voice, FM voice
D. CW, SSB voice, RTTY, FM voice
3AH 7-1.1 D
To what is the deviation of an FM transmission proportional?
A. Only the frequency of the audio modulating signal
B. The frequency and the amplitude of the audio modulating
signal
C. The duty cycle of the audio modulating signal
D. Only the amplitude of the audio modulating signal
3AH 7-2.1 B
What is the result of over-deviation in an FM transmitter?
A. Increased transmitter power consumption
B. Out-of-channel emissions (splatter)
C. Increased transmitter range
D. Inadequate carrier suppression
3AH 7-2.2 C
What is splatter?
A. Interference to adjacent signals caused by excessive
transmitter keying speeds
B. Interference to adjacent signals caused by improper
transmitter neutralization
C. Interference to adjacent signals caused by over-
modulation of a transmitter
D. Interference to adjacent signals caused by parasitic
oscillations at the antenna
--------------------------------------------------
End of Subelement 3AH.