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