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Subelement ZLE
The Radio Transmitter
Section ZLE18
Transmitter Block Diagrams
ZLE1801
In the transmitter block diagram shown, the "oscillator"
A.
is variable in frequency
B.
generates an audio frequency tone during tests
Correct Answer
C.
uses a
crystal
for
good
frequency
stability
D.
may have a calibrated dial
ZLE1801
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ZLE1802
In the transmitter block diagram shown, the "balanced modulator"
A.
balances the high and low frequencies in the audio signal
Correct Answer
B.
performs
double
sideband
suppressed
carrier
modulation
C.
acts as a tone control
D.
balances the standing wave ratio
ZLE1802
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ZLE1803
In the transmitter block diagram shown, the "filter"
A.
removes mains hum from the audio signal
B.
suppresses unwanted harmonics of the RF signal
Correct Answer
C.
removes one
sideband
from the modulated signal
D.
removes the carrier component from the modulated signal
ZLE1803
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ZLE1804
In the transmitter block diagram shown, the "mixer"
A.
adds the correct proportion of carrier to the SSB signal
B.
mixes the audio and RF signals in the correct proportions
Correct Answer
C.
translates
the SSB signal to the
required
frequency
D.
mixes the two sidebands in the correct proportions
ZLE1804
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ZLE1805
In the transmitter block diagram shown, the "linear amplifier"
A.
has all components arranged in-line
Correct Answer
B.
amplifies
the modulated signal with no
distortion
C.
aligns the two sidebands correctly
D.
removes any unwanted amplitude modulation from the signal
ZLE1805
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ZLE1806
In the transmitter block diagram shown, the "VFO" is
A.
a voice frequency oscillator
B.
a varactor fixed oscillator
C.
a virtual faze oscillator
Correct Answer
D.
a
variable
frequency oscillator
ZLE1806
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ZLE1807
In the transmitter block diagram shown, the "master oscillator" produces
Correct Answer
A.
a
steady
signal at the required carrier frequency
B.
a pulsating signal at the required carrier frequency
C.
a 800 Hz signal to modulate the carrier
D.
a modulated CW signal
ZLE1807
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ZLE1808
In the transmitter block diagram shown, the "driver buffer"
A.
filters any sharp edges from the input signal
B.
drives the power amplifier into saturation
Correct Answer
C.
provides
isolation
between the oscillator and power amplifier
D.
changes the frequency of the master oscillator signal
ZLE1808
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ZLE1809
In the transmitter block diagram shown, the "Morse key"
A.
turns the DC power to the transmitter on and off
Correct Answer
B.
allows the
oscillator
signal to
pass
only when the key is depressed
C.
changes the frequency of the transmitted signal when the key is depressed
D.
adds an 800 Hz audio tone to the signal when the key is depressed
ZLE1809
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ZLE1810
In the transmitter block diagram shown, the "power amplifier"
Correct Answer
A.
need not have
linear
characteristics
B.
amplifies the bandwidth of its input signal
C.
must be adjusted during key-up conditions
D.
should be water-cooled
ZLE1810
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ZLE1811
In the transmitter block diagram shown, the "speech amplifier"
Correct Answer
A.
amplifies the audio signal from the
microphone
B.
is a spectral equalization entropy changer
C.
amplifies only speech, while discriminating against background noises
D.
shifts the frequency spectrum of the audio signal into the RF region
ZLE1811
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ZLE1812
In the transmitter block diagram shown, the "modulator"
A.
is an amplitude modulator with feedback
B.
is an SSB modulator with feedback
C.
causes the speech waveform to gate the oscillator on and off
Correct Answer
D.
causes the speech waveform to
shift
the
frequency
of the oscillator
ZLE1812
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ZLE1813
In the transmitter block diagram shown, the "oscillator" is
A.
an audio frequency oscillator
Correct Answer
B.
a variable frequency RF oscillator
C.
a beat frequency oscillator
D.
a variable frequency audio oscillator
ZLE1813
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ZLE1814
In the transmitter block diagram shown, the "frequency multiplier"
A.
translates the frequency of the modulated signal into the RF spectrum
B.
changes the frequency of the speech signal
Correct Answer
C.
produces
a
harmonic
of the oscillator signal
D.
multiplies the oscillator signal by the speech signal
ZLE1814
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ZLE1815
In the transmitter block diagram shown, the "power amplifier"
A.
increases the voltage of the mains to drive the antenna
B.
amplifies the audio frequency component of the signal
C.
amplifies the selected sideband to a suitable level
Correct Answer
D.
amplifies the RF signal to a suitable level
ZLE1815
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ZLE1816
The signal from an amplitude modulated transmitter consists of
Correct Answer
A.
a carrier and two sidebands
B.
a carrier and one sideband
C.
no carrier and two sidebands
D.
no carrier and one sideband
ZLE1816
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ZLE1817
The signal from a frequency modulated transmitter has
A.
an amplitude which varies with the modulating waveform
Correct Answer
B.
a
frequency
which varies with the modulating waveform
C.
a single sideband which follows the modulating waveform
D.
no sideband structure
ZLE1817
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ZLE1818
The signal from a balanced modulator consists of
A.
a carrier and two sidebands
B.
a carrier and one sideband
Correct Answer
C.
no carrier and two sidebands
D.
no carrier and one sideband
ZLE1818
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ZLE1819
The signal from a CW transmitter consists of
A.
a continuous, unmodulated RF waveform
B.
a continuous RF waveform modulated with an 800 Hz Morse signal
Correct Answer
C.
an RF waveform which is
keyed
on and off to
form
Morse
characters
D.
a continuous RF waveform which changes frequency in synchronism with an applied Morse signal
ZLE1819
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ZLE1820
The following signal can be amplified using a non-linear amplifier
A.
SSB
Correct Answer
B.
FM
C.
AM
D.
DSBSC
ZLE1820
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