FCC Exam Question: 3-11B3

What is the second harmonic of SSB frequency 4146 kHz?

A. 8292 kHz.
B. 4.146 MHz.
C. 2073 kHz.
D. 12438 kHz.
Correct Answer: A

Explanation: A harmonic is an integer multiple of a fundamental frequency. The "second harmonic" specifically refers to the fundamental frequency multiplied by two. For an SSB frequency of 4146 kHz, its second harmonic is calculated as: 4146 kHz * 2 = 8292 kHz. Therefore, 8292 kHz is the correct second harmonic. Option B, 4.146 MHz, is simply the fundamental frequency expressed in megahertz (4146 kHz = 4.146 MHz), not a harmonic. Option C, 2073 kHz, is half the fundamental frequency (4146 / 2), which is a subharmonic. Option D, 12438 kHz, is three times the fundamental frequency (4146 * 3), making it the third harmonic.

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