Question
Which mode is most commonly used for voice communications on the 17- and 12-meter bands?
Answer Options
- A) Upper sideband
- B) Lower sideband
- C) Suppressed sideband
- D) Double sideband
Correct Answer: A
Explanation
The 17\text{-meter} band (18 \text{MHz}) and the 12\text{-meter} band (24 \text{MHz}) both fall above the 10 \text{MHz} dividing line used for SSB convention. Therefore, in accordance with the established amateur practice, Upper Sideband (USB) is the mode most commonly used for voice communications on these two bands.
This continues the fundamental rule: LSB for frequencies below 10 \text{MHz} and USB for frequencies 10 \text{MHz} and above. While these bands are secondary allocations and typically less crowded than the traditional bands, adherence to the USB convention remains standard operating procedure.
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