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ZLC15
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ZLC15
Subelement ZLC
An Amateur Radio Station
Section ZLC15
HF Station Arrangement
ZLC1501
In the block diagram shown, the "linear amplifier" is
A.
an amplifier to remove distortion in signals from the transceiver
Correct Answer
B.
an
optional
amplifier to be
switched
in when
higher
power
is
required
C.
an amplifier with all components arranged in-line
D.
a push-pull amplifier to cancel second harmonic distortion
ZLC1501
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ZLC1502
In the block diagram shown, the additional signal path above the "linear amplifier" block indicates that
A.
some power is passed around the linear amplifier for stability
B.
"feed-forward" correction is being used to increase linearity
C.
the linear amplifier input and output terminals may be short-circuited
Correct Answer
D.
the linear amplifier may be
optionally
switched
out of circuit to
reduce
output power
ZLC1502
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ZLC1503
In the block diagram shown, the "low pass filter" must be rated to
Correct Answer
A.
carry
the full
power
output from the
station
B.
filter out higher-frequency modulation components for maximum intelligibility
C.
filter out high-amplitude sideband components
D.
emphasise low-speed Morse code output
ZLC1503
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ZLC1504
In the block diagram shown, the "SWR bridge" is a
A.
switched wave rectifier for monitoring power output
B.
static wave reducer to minimize static electricity from the antenna
Correct Answer
C.
device
to monitor the
standing
-wave-
ratio
on the antenna
feedline
D.
short wave rectifier to protect against lightning strikes
ZLC1504
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ZLC1505
In the block diagram shown, the "antenna switch"
Correct Answer
A.
switches the
transmitter
output to the dummy load for
tune
-up
purposes
B.
switches the antenna from transmit to receive
C.
switches the frequency of the antenna for operation on different bands
D.
switches surplus output power from the antenna to the dummy load to avoid distortion.
ZLC1505
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ZLC1506
In the block diagram shown, the "antenna tuner"
A.
adjusts the resonant frequency of the antenna to minimize harmonic radiation
B.
adjusts the resonant frequency of the antenna to maximise power output
C.
changes the standing-wave-ratio on the transmission line to the antenna
Correct Answer
D.
adjusts the
impedance
of the antenna system seen at the
transceiver
output
ZLC1506
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ZLC1507
In the block diagram shown, the "dummy load" is
Correct Answer
A.
used to allow
adjustment
of the
transmitter
without causing
interference
to others
B.
a load used to absorb surplus power which is rejected by the antenna system
C.
used to absorb high-voltage impulses caused by lightning strikes to the antenna
D.
an additional load used to compensate for a badly-tuned antenna system
ZLC1507
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ZLC1508
In the block diagram shown, the connection between the SWR bridge and the antenna switch is normally a
A.
twisted pair cable
Correct Answer
B.
coaxial
cable
C.
quarter-wave matching section
D.
short length of balanced ladder-line
ZLC1508
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ZLC1509
In this block diagram, the block designated "antenna tuner" is not normally necessary when
Correct Answer
A.
the antenna
input
impedance
is
50
ohms
B.
a half wave antenna is used, fed at one end
C.
the antenna is very long compared to a wavelength
D.
the antenna is very short compared to a wavelength
ZLC1509
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ZLC1510
In the block diagram shown, the connection between the "antenna tuner" and the "antenna" could be made with
A.
three-wire mains power cable
B.
heavy hook-up wire
Correct Answer
C.
50
ohm
coaxial
cable
D.
an iron-cored transformer
ZLC1510
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