Question
What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
Answer Options
- A) 7.178 MHz to 7.181 MHz
- B) 7.178 MHz to 7.184 MHz
- C) 7.175 MHz to 7.178 MHz
- D) 7.1765 MHz to 7.1795 MHz
Correct Answer: C
Explanation
In Lower Sideband (LSB) operation, the signal’s information (the 3 \text{kHz} bandwidth) is transmitted below the displayed carrier frequency. The displayed frequency is essentially the point where the carrier would be if it were transmitted.
If the displayed carrier frequency is set to 7.178 \text{MHz}, the 3 \text{kHz} wide LSB signal will occupy the frequencies 7.175 \text{MHz} to 7.178 \text{MHz}. In this setup, 7.178 \text{MHz} represents the upper edge of the transmitted energy, and 7.175 \text{MHz} represents the lower edge.
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