7-A-009: Modulation-Demodulation, AM & FM
7-009A:
What statement best describes modulation?
Imposing intelligence onto a radio carrier signal.
Changing mark-space to 1 and 0.
Adjusting the frequency to the optimum band for long distance communications.
Converting the carrier from a low frequency to a higher frequency.
7-009B:
What statement best describes demodulation?
Removing the information signal from the carrier.
Detuning the receiver to remove interfering signals.
Removing atmospheric noise from the signal.
Separating the TELEX signals from the voice signals.
7-009C:
Which statement best describes amplitude modulation?
The information signal changes the amplitude but does not change the carrier frequency.
The character data from the terminal is changed to audio tones.
The frequency is varied in synchronization with the modulating signal.
The amplitude of the carrier is changed but there is still only a single frequency being transmitted.
7-009D:
What is the emission designation for MF-HF voice signals?
J3E
F1B
J2B
F3E
7-009E:
Which statement best describes frequency modulation?
The frequency is changed by the information signal and the amplitude remains unchanged.
Both the amplitude and frequency are changed by the modulating signal.
Frequency modulation is subject to interference by atmospheric noise.
High level mixing of the final amplifier signal and the information signal.
7-009F:
What is the emission designation for VHF-FM?
F3E
F3C
J2B
AME
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● = Review
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● = Learned
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● = Incorrect answer
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