Question
Which mode of voice communication is most commonly used on the HF amateur bands?
Answer Options
- A) Frequency modulation
- B) Double sideband
- C) Single sideband
- D) Single phase modulation
Correct Answer: C
Explanation
Single Sideband (SSB) is by far the most common mode used for voice communications on the High Frequency (HF) amateur bands. SSB achieves a significant advantage in efficiency and bandwidth compared to older modes like Amplitude Modulation (AM) or Double Sideband (DSB).
SSB utilizes less than half the bandwidth of AM and provides much greater power efficiency. Because SSB suppresses the carrier and one of the sidebands, the transmitter’s power is concentrated entirely into the single transmitted sideband, giving it a much greater effective communication range for a given power level compared to DSB or FM.
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