Question
How close to the upper edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide USB?
Answer Options
- A) At least 3 kHz above the edge of the band
- B) At least 3 kHz below the edge of the band
- C) At least 1 kHz above the edge of the segment
- D) At least 1 kHz below the edge of the segment
Correct Answer: B
Explanation
When using Upper Sideband (USB), the transmitted energy is above the displayed carrier frequency. If you are operating near the upper frequency edge of a band segment, you must ensure that none of your 3 \text{kHz} wide signal falls outside the legal limit.
Since the USB signal extends upward from the displayed carrier frequency, the carrier must be set at least 3 \text{kHz} below the edge of the band. For example, if the segment ends at 14.350 \text{MHz}, your carrier frequency should be no higher than 14.347 \text{MHz} (14.347 \text{MHz} plus 3 \text{kHz} equals 14.350 \text{MHz}). This prevents the high-frequency edge of your signal from violating the band boundary.
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