Ham Radio General Class Practice Test

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What is the total bandwidth of an FM-phone transmission having a 5 kHz deviation and a 3 kHz modulating frequency?

3 kHz
5 kHz
8 kHz
16 kHz

The correct answer is: 16 kHz

The total bandwidth of an FM-phone transmission can be calculated using Carson's Rule, which provides a way to estimate the bandwidth for frequency modulation. According to Carson's Rule, the bandwidth is approximately twice the sum of the peak frequency deviation and the highest modulating frequency. In this scenario, a frequency deviation of 5 kHz and a modulating frequency of 3 kHz are given. By applying the formula: Total Bandwidth = 2 * (Frequency Deviation + Highest Modulating Frequency) Substituting the numbers into the formula: Total Bandwidth = 2 * (5 kHz + 3 kHz) Total Bandwidth = 2 * 8 kHz Total Bandwidth = 16 kHz Thus, the total bandwidth of the FM-phone transmission is 16 kHz. Understanding this principle is essential when calculating bandwidth requirements for different types of FM modulation in ham radio operations.