G8A02
What is the name of the process that changes the phase angle of an
RF wave to convey information?
A. Phase convolution
B. Phase modulation
C. Angle convolution
D. Radian Inversion
G8A03
What is the name of the process which changes the frequency of an
RF wave to convey information?
A. Frequency convolution
B. Frequency transformation
C. Frequency conversion
D. Frequency modulation
G8A04
What emission is produced by a reactance modulator connected to an RF power amplifier?
A. Multiplex modulation
B. Phase modulation
C. Amplitude modulation
D. Pulse modulation
G8A05
What type of transmission varies the instantaneous power level
of the RF signal to convey information?
A. Frequency shift keying
B. Pulse modulation
C. Frequency modulation
D. Amplitude modulation
G8A06
What is one advantage of carrier suppression in a single-sideband phone
transmission?
A. Audio fidelity is improved
B. Greater modulation percentage is obtainable with lower distortion
C. More transmitter power can be put into the remaining sideband
D. Simpler receiving equipment can be used
G8A07
Which of the following phone emissions uses the narrowest
frequency bandwidth?
A. Single sideband
B. Double sideband
C. Phase modulation
D. Frequency modulation
G8A08
What happens to the signal of an over-modulated single-sideband phone transmitter?
A. It becomes louder with no other effects
B. It occupies less bandwidth with poor high frequency response
C. It has higher fidelity and improved signal to noise ratio
D. It becomes distorted and occupies more bandwidth
G8A09
What control is typically adjusted for proper ALC setting on an
amateur single sideband transceiver?
A. The RF Clipping Level
B. Audio or microphone gain
C. Antenna inductance or capacitance
D. Attenuator Level
G8A10
What is meant by flat-topping of a single-sideband phone transmission?
A. Signal distortion caused by insufficient collector current
B. The transmitter's automatic level control is properly adjusted
C. Signal distortion caused by excessive drive
D. 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?
A. The carrier frequency changes proportionally to the instantaneous
amplitude of the modulating signal
B. The carrier frequency changes proportionally to the amplitude and
frequency of the modulating signal
C. The carrier amplitude changes proportionally to the instantaneous
frequency of the modulating signal
D. 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 p
roperly adjusted balanced modulator?
A. Both upper and lower sidebands
B. Either upper or lower sideband, but not both
C. Both upper and lower sidebands and the carrier
D. The modulating signal and the unmodulated carrier
G8B02
If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce
a 455 kHz intermediate frequency (IF) signal, what type of interference will a
13.345 MHz signal produce in the receiver?
A. Local oscillator
B. Image response
C. Mixer interference
D. Intermediate interference
G8B03
What stage in a transmitter would change a 5.3 MHz input
signal to 14.3 MHz?
A. A mixer
B. A beat frequency oscillator
C. A frequency multiplier
D. A linear translator
G8B04
What is the name of the stage in a VHF FM transmitter that selects a
harmonic of an HF signal to reach the desired operating frequency?
A. Mixer
B. Reactance modulator
C. Pre-emphasis network
D. Multiplier
G8B05
Why isn't frequency modulated (FM) phone used below 29.5 MHz?
A. The transmitter efficiency for this mode is low
B. Harmonics could not be attenuated to practical levels
C. The bandwidth would exceed FCC limits
D. The frequency stability would not be adequate
G8B06
What is the total bandwidth of an FM-phone transmission having a 5 kHz
deviation and a 3 kHz modulating frequency?
A. 3 kHz
B. 5 kHz
C. 8 kHz
D. 16 kHz
G8B07
What is the frequency deviation for a 12.21-MHz reactance-modulated
oscillator in a 5-kHz deviation, 146.52-MHz FM-phone transmitter?
A. 101.75 Hz
B. 416.7 Hz
C. 5 kHz
D. 60 kHz
G8B08
How is frequency shift related to keying speed in an FSK signal?
A. The frequency shift in hertz must be at least four times the keying speed in WPM
B. The frequency shift must not exceed 15 Hz per WPM of keying speed
C. Greater keying speeds require greater frequency shifts
D. Greater keying speeds require smaller frequency shifts
G8B09
What do RTTY, Morse code, PSK31 and packet communications have in common?
A. They require the same bandwidth
B. They are digital modes
C. They use on/off keying
D. They use phase shift modulation
G8B10
When transmitting a data mode signal, why is it important to know
the duty cycle of the mode you are using?
A. To aid in tuning your transmitter
B. To prevent damage to your transmitter's final output stage
C. To allow time for the other station to break in during a transmission
D. All of these choices are correct
G8B11
What part of the 20 meter band is most commonly used for PSK31 operation?
A. At the bottom of the slow-scan TV segment, near 14.230 MHz
B. At the top of the SSB phone segment, near 14.325 MHz
C. In the middle of the CW segment, near 14.100 MHz
D. Below the RTTY segment, near 14.070 MHz
G8B12
What is another term for the mixing of two RF signals?
A. Heterodyning
B. Synthesizing
C. Cancellation
D. Multiplying