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Subel. T8
12 questions
Subelement T8

SIGNALS AND EMISSIONS

Section T8A

Basic characteristics of FM and SSB; Bandwidth of various modulation modes: CW, SSB, FM, fast-scan TV; Choice of emission type: selection of USB vs LSB, use of SSB for weak signal work, use of FM for VHF packet and repeaters

Which of the following is a form of amplitude modulation?

  • Spread spectrum
  • Packet radio
  • Correct Answer
    Single sideband
  • Phase shift keying (PSK)
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What type of modulation is commonly used for VHF packet radio transmissions?

  • Correct Answer
    FM or PM
  • SSB
  • AM
  • PSK
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Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?

  • FM
  • DRM
  • Correct Answer
    SSB
  • PM
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Which type of modulation is commonly used for VHF and UHF voice repeaters?

  • AM
  • SSB
  • PSK
  • Correct Answer
    FM or PM
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Which of the following signal types has the narrowest bandwidth?

  • FM voice
  • SSB voice
  • Correct Answer
    CW
  • Slow-scan TV
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Which sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?

  • Correct Answer
    Upper sideband
  • Lower sideband
  • Suppressed sideband
  • Inverted sideband
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What is one characteristic of single sideband (SSB) compared to FM?

  • SSB signals are easier to tune in correctly
  • SSB signals are less susceptible to interference
  • Correct Answer
    SSB signals have narrower bandwidth
  • SSB signals are less susceptible to high SWR
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What is the approximate bandwidth of a typical single sideband (SSB) voice signal?

  • 1 kHz
  • Correct Answer
    3 kHz
  • 6 kHz
  • 15 kHz
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What is the approximate bandwidth of an FM voice signal on VHF repeaters?

  • Less than 500 Hz
  • About 150 kHz
  • Correct Answer
    Between 10 and 15 kHz
  • Between 50 and 125 kHz
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What is the approximate bandwidth of AM fast-scan TV transmissions?

  • More than 10 MHz
  • Correct Answer
    About 6 MHz
  • About 3 MHz
  • About 1 MHz
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What is the approximate bandwidth required to transmit a CW signal?

  • 2.4 kHz
  • Correct Answer
    150 Hz
  • 1000 Hz
  • 15 kHz
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Which of the following is a disadvantage of FM compared with single sideband?

  • Voice quality is poorer
  • Correct Answer
    Only one signal can be received at a time
  • FM signals are harder to tune
  • FM signals are more susceptible to high SWR
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Go to T7D Go to T8B
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