Question
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
Answer Options
- A) 14.347 MHz to 14.647 MHz
- B) 14.347 MHz to 14.350 MHz
- C) 14.344 MHz to 14.347 MHz
- D) 14.3455 MHz to 14.3485 MHz
Correct Answer: B
Explanation
In Upper Sideband (USB) operation, the signal’s information (the 3 \text{kHz} bandwidth) is transmitted above the displayed carrier frequency. The displayed frequency is the theoretical suppressed carrier frequency.
If the displayed carrier frequency is set to 14.347 \text{MHz}, the 3 \text{kHz} wide USB signal will occupy the frequencies 14.347 \text{MHz} to 14.350 \text{MHz}. In this configuration, 14.347 \text{MHz} represents the lower edge of the transmitted energy, and 14.350 \text{MHz} represents the upper edge.
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