Ham Amateur Radio Technician Practice Exam

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

10 kHz
16 kHz
12 kHz
8 kHz

The correct answer is: 16 kHz

The total bandwidth of an FM phone transmission can be determined using the Carson's Rule, which states that the bandwidth (BW) needed for frequency modulation can be calculated with the formula: BW = 2 * (Deviation + Modulating Frequency) In this case, the deviation is 5 kHz and the modulating frequency is 3 kHz. Using Carson's Rule: BW = 2 * (5 kHz + 3 kHz) BW = 2 * (8 kHz) BW = 16 kHz This calculation indicates that the required bandwidth for the FM transmission, given the parameters of a 5 kHz deviation and a 3 kHz modulating frequency, amounts to 16 kHz. Therefore, the answer is 16 kHz, as it accurately reflects the bandwidth needed for this type of FM transmission according to the rule.