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Subelement ZLE
The Radio Transmitter
Section ZLE19
Transmitter Theory
ZLE1901
Morse code is usually transmitted by radio as
Correct Answer
A.
an
interrupted
carrier
B.
a voice modulated carrier
C.
a continuous carrier
D.
a series of clicks
ZLE1901
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ZLE1902
To obtain high frequency stability in a transmitter, the VFO should be
A.
run from a non-regulated AC supply
B.
in a plastic box
Correct Answer
C.
powered
from a regulated DC supply
D.
able to change frequency with temperature
ZLE1902
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ZLE1903
SSB transmissions
A.
occupy about twice the bandwidth of AM transmissions
B.
contain more information than AM transmissions
Correct Answer
C.
occupy about
half
the bandwidth of AM transmissions
D.
are compatible with FM transmissions
ZLE1903
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ZLE1904
The purpose of a balanced modulator in a SSB transmitter is to
A.
make sure that the carrier and both sidebands are in phase
B.
make sure that the carrier and both sidebands are 180 degrees out of phase
C.
ensure that the percentage of modulation is kept constant
Correct Answer
D.
suppress
the carrier while
producing
two sidebands
ZLE1904
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ZLE1905
Several stations advise that your FM simplex transmission in the "two metre" band is distorted. The cause might be that
Correct Answer
A.
the transmitter
modulation
deviation
is too
high
B.
your antenna is too low
C.
the transmitter has become unsynchronised
D.
your transmitter frequency split is incorrect
ZLE1905
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ZLE1906
The driver stage of a transmitter is located
Correct Answer
A.
before the
power
amplifier
B.
between oscillator and buffer
C.
with the frequency multiplier
D.
after the output low-pass filter circuit
ZLE1906
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ZLE1907
The purpose of the final amplifier in a transmitter is to
A.
increase the frequency of a signal
B.
isolate the multiplier and later stages
C.
produce a stable radio frequency
Correct Answer
D.
increase the
power
fed
to the
antenna
ZLE1907
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ZLE1908
The difference between DC input power and RF power output of a transmitter RF amplifier
A.
radiates from the antenna
Correct Answer
B.
is
dissipated
as
heat
C.
is lost in the feedline
D.
is due to oscillating current
ZLE1908
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ZLE1909
The process of modulation allows
Correct Answer
A.
information to be
impressed
on to a carrier
B.
information to be removed from a carrier
C.
voice and Morse code to be combined
D.
none of these
ZLE1909
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ZLE1910
The output power rating of a linear amplifier in a SSB transmitter is specified by the
A.
peak DC input power
B.
mean AC input power
Correct Answer
C.
peak
envelope
power
D.
unmodulated carrier power
ZLE1910
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