If a 1500 kHz radio wave is modulated by a 2000 Hz sine wave tone, what frequencies does the modulated wave contain?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Study for the FCC Element 6 – Radiotelegraph Operator Test. Familiarize yourself with theoretical and practical questions. Boost your readiness for the exam with flashcards, multiple-choice questions, and detailed explanations.

Multiple Choice

If a 1500 kHz radio wave is modulated by a 2000 Hz sine wave tone, what frequencies does the modulated wave contain?

Explanation:
When a carrier wave, such as a 1500 kHz radio wave, is modulated by a sine wave tone, the modulation process creates sidebands around the carrier frequency. The basic principle of amplitude modulation (AM) states that the frequencies of the modulated signal will consist of the carrier frequency plus and minus the modulation frequency. In this case, the carrier frequency of 1500 kHz corresponds to 1500,000 Hz. When this carrier is modulated by a sine wave tone of 2000 Hz, the modulated wave will produce two side frequencies. These are calculated by adding and subtracting the modulation frequency from the carrier frequency: - The upper side frequency is found by adding the modulation frequency: 1500,000 Hz + 2000 Hz = 1502,000 Hz (or 1502 kHz). - The lower side frequency is found by subtracting the modulation frequency: 1500,000 Hz - 2000 Hz = 1498,000 Hz (or 1498 kHz). Therefore, the modulated wave contains the original carrier frequency of 1500 kHz, as well as the two side frequencies of 1502 kHz and 1498 kHz. This

When a carrier wave, such as a 1500 kHz radio wave, is modulated by a sine wave tone, the modulation process creates sidebands around the carrier frequency. The basic principle of amplitude modulation (AM) states that the frequencies of the modulated signal will consist of the carrier frequency plus and minus the modulation frequency.

In this case, the carrier frequency of 1500 kHz corresponds to 1500,000 Hz. When this carrier is modulated by a sine wave tone of 2000 Hz, the modulated wave will produce two side frequencies. These are calculated by adding and subtracting the modulation frequency from the carrier frequency:

  • The upper side frequency is found by adding the modulation frequency:

1500,000 Hz + 2000 Hz = 1502,000 Hz (or 1502 kHz).

  • The lower side frequency is found by subtracting the modulation frequency:

1500,000 Hz - 2000 Hz = 1498,000 Hz (or 1498 kHz).

Therefore, the modulated wave contains the original carrier frequency of 1500 kHz, as well as the two side frequencies of 1502 kHz and 1498 kHz.

This

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy