G8A: Carriers and modulation: AM; FM; single and double sideband ; modulation envelope; deviation; overmodulation
G8A01:
What is the name of the process that changes the envelope of an RF wave to convey information?
Amplitude modulation
Phase modulation
Frequency modulation
Spread Spectrum modulation
G8A02:
What is the name of the process that changes the phase angle of an RF wave to convey information?
Phase modulation
Phase convolution
Angle convolution
Radian Inversion
G8A03:
What is the name of the process which changes the frequency of an RF wave to convey information?
Frequency modulation
Frequency convolution
Frequency transformation
Frequency conversion
G8A04:
What emission is produced by a reactance modulator connected to an RF power amplifier?
Phase modulation
Multiplex modulation
Amplitude modulation
Pulse modulation
G8A05:
What type of transmission varies the instantaneous power level of the RF signal to convey information?
Amplitude modulation
Frequency shift keying
Pulse modulation
Frequency modulation
G8A06:
What is one advantage of carrier suppression in a single-sideband phone transmission?
More transmitter power can be put into the remaining sideband
Audio fidelity is improved
Greater modulation percentage is obtainable with lower distortion
Simpler receiving equipment can be used
G8A07:
Which of the following phone emissions uses the narrowest frequency bandwidth?
Single sideband
Double sideband
Phase modulation
Frequency modulation
G8A08:
What happens to the signal of an over-modulated single-sideband phone transmitter?
It becomes distorted and occupies more bandwidth
It becomes louder with no other effects
It occupies less bandwidth with poor high frequency response
It has higher fidelity and improved signal to noise ratio
G8A09:
What control is typically adjusted for proper ALC setting on an amateur single sideband transceiver?
Audio or microphone gain
The RF Clipping Level
Antenna inductance or capacitance
Attenuator Level
G8A10:
What is meant by flat-topping of a single-sideband phone transmission?
Signal distortion caused by excessive drive
Signal distortion caused by insufficient collector current
The transmitter's automatic level control is properly adjusted
The transmitter's carrier is properly suppressed
G8A11:
What happens to the RF carrier signal when a modulating audio signal is applied to an FM transmitter?
The carrier frequency changes proportionally to the instantaneous amplitude of the modulating signal
The carrier frequency changes proportionally to the amplitude and frequency of the modulating signal
The carrier amplitude changes proportionally to the instantaneous frequency of the modulating signal
The carrier phase changes proportionally to the instantaneous amplitude of the modulating signal
G8A12:
What signal(s) would be found at the output of a properly adjusted balanced modulator?
Both upper and lower sidebands
Either upper or lower sideband, but not both
Both upper and lower sidebands and the carrier
The modulating signal and the unmodulated carrier
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