Question
How close to the lower edge of a band’s phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?
Answer Options
- A) At least 3 kHz above the edge of the segment
- B) At least 3 kHz below the edge of the segment
- C) At least 1 kHz below the edge of the segment
- D) At least 1 kHz above the edge of the segment
Correct Answer: A
Explanation
When using Lower Sideband (LSB), the transmitted energy is below the displayed carrier frequency. If you are operating near the lower frequency edge of a band segment, you must ensure that none of your transmitted signal energy falls outside the legal limit. Since the LSB signal is 3 \text{kHz} wide and extends downward from the displayed carrier frequency, the carrier must be set at least 3 \text{kHz} above the edge of the segment.
For example, if the phone segment starts at 7.175 \text{MHz}, your carrier frequency should be set no lower than 7.178 \text{MHz} (7.178 \text{MHz} minus 3 \text{kHz} equals 7.175 \text{MHz}). This prevents the low-frequency edge of your signal from violating the band boundary.
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