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Question 196

What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?

  1. 14.347 MHz to 14.647 MHz
  2. 14.347 MHz to 14.350 MHzCorrect answer
  3. 14.344 MHz to 14.347 MHz
  4. 14.3455 MHz to 14.3485 MHz

Explanation

USB places the transmitted energy above the suppressed carrier frequency, so a 3 kHz wide signal displayed at 14.347 MHz occupies from 14.347 MHz up to 14.347 plus 0.003, which is 14.350 MHz. Extending the signal to 14.647 MHz misplaces the decimal and would make it 300 kHz wide.

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Question 196: What frequency range is occupied by a 3 kHz USB signal with… · FCC General Class (Element 3) · Questena