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G2A05

OPERATING PROCEDURES · - Phone operating procedures: USB/LSB conventions, breaking into a contact, transmitter setup for voice operation; answering DX stations

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Which mode of voice communication is most commonly used on the HF amateur bands?

  1. AFrequency modulation
  2. BDouble sideband
  3. CSingle sideband
  4. DSingle phase modulation
Why Single sideband is the standard voice mode below 30 MHz because it packs a voice signal into about 3 kHz of bandwidth and puts essentially all of the transmitter power into the information-carrying sideband, with no carrier and no redundant second sideband. That makes it far more spectrum-efficient and far better for weak-signal, long-distance work than AM or FM. FM is used on HF only in a few narrow segments such as parts of 10 meters, and full double sideband AM is a niche mode.
Watch out Double sideband AM is what SSB was derived from, but it uses roughly twice the bandwidth and wastes most of the power in the carrier, so it is rare on crowded HF bands. Frequency modulation needs far more bandwidth than HF band plans allow for general use.
HF is crowded, so use the narrow mode: SSB, about 3 kHz, no carrier, no wasted sideband.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of G2A

  1. G2A01 Which mode is most commonly used for voice communications on frequencies of 14 MHz or higher?
  2. G2A02 Which mode is most commonly used for voice communications on the 160-, 75-, and 40-meter bands?
  3. G2A03 Which mode is most commonly used for SSB voice communications in the VHF and UHF bands?
  4. G2A04 Which mode is most commonly used for voice communications on the 17- and 12-meter bands?
  5. G2A05 Which mode of voice communication is most commonly used on the HF amateur bands?
  6. G2A06 Which of the following is an advantage of using single sideband, as compared to other analog voice modes on t…
  7. G2A07 Which of the following statements is true of single sideband (SSB)?
  8. G2A08 What is the recommended way to break into a phone contact?
  9. G2A09 Why do most amateur stations use lower sideband on the 160-, 75-, and 40-meter bands?
  10. G2A10 Which of the following statements is true of VOX operation versus PTT operation?
  11. G2A11 Generally, who should respond to a station in the contiguous 48 states calling "CQ DX"?
  12. G2A12 What control is typically adjusted for proper ALC setting on a single sideband transceiver?
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