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Subel. ZLE
10 questions
Subelement ZLE

The Radio Transmitter

Section ZLE19

Transmitter Theory

Morse code is usually transmitted by radio as

  • Correct Answer
    an interrupted carrier
  • a voice modulated carrier
  • a continuous carrier
  • a series of clicks
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To obtain high frequency stability in a transmitter, the VFO should be

  • run from a non-regulated AC supply
  • in a plastic box
  • Correct Answer
    powered from a regulated DC supply
  • able to change frequency with temperature
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SSB transmissions

  • occupy about twice the bandwidth of AM transmissions
  • contain more information than AM transmissions
  • Correct Answer
    occupy about half the bandwidth of AM transmissions
  • are compatible with FM transmissions
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The purpose of a balanced modulator in a SSB transmitter is to

  • make sure that the carrier and both sidebands are in phase
  • make sure that the carrier and both sidebands are 180 degrees out of phase
  • ensure that the percentage of modulation is kept constant
  • Correct Answer
    suppress the carrier while producing two sidebands
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Several stations advise that your FM simplex transmission in the "two metre" band is distorted. The cause might be that

  • Correct Answer
    the transmitter modulation deviation is too high
  • your antenna is too low
  • the transmitter has become unsynchronised
  • your transmitter frequency split is incorrect
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The driver stage of a transmitter is located

  • Correct Answer
    before the power amplifier
  • between oscillator and buffer
  • with the frequency multiplier
  • after the output low-pass filter circuit
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The purpose of the final amplifier in a transmitter is to

  • increase the frequency of a signal
  • isolate the multiplier and later stages
  • produce a stable radio frequency
  • Correct Answer
    increase the power fed to the antenna
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The difference between DC input power and RF power output of a transmitter RF amplifier

  • radiates from the antenna
  • Correct Answer
    is dissipated as heat
  • is lost in the feedline
  • is due to oscillating current
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The process of modulation allows

  • Correct Answer
    information to be impressed on to a carrier
  • information to be removed from a carrier
  • voice and Morse code to be combined
  • none of these
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The output power rating of a linear amplifier in a SSB transmitter is specified by the

  • peak DC input power
  • mean AC input power
  • Correct Answer
    peak envelope power
  • unmodulated carrier power
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