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FM Radio Frequency Modulation

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Questions and Answers

What is the condition for an FM signal to be classified as a narrowband FM signal?

𝛽 ≪ 1 or ∆𝑓 ≪ 𝑓𝑚 (correct)
𝛽 = 1 or ∆𝑓 = 𝑓𝑚
𝛽 > 1 or ∆𝑓 > 𝑓𝑚
𝛽 ≫ 1 or ∆𝑓 ≫ 𝑓𝑚

What is the relationship between the amplitude of sidebands and the coefficient 𝐽𝑛(𝛽) in an FM signal?

The amplitude of sidebands is independent of 𝐽𝑛(𝛽)
The amplitude of sidebands is dependent on the square of 𝐽𝑛(𝛽)
The amplitude of sidebands is inversely proportional to 𝐽𝑛(𝛽)
The amplitude of sidebands is directly proportional to 𝐽𝑛(𝛽) (correct)

What is the difference between the spectrum of narrowband FM and AM signals?

The sideband components are 180 degrees out of phase (correct)
The sideband components are at different frequencies
The sideband components are 90 degrees out of phase
The sideband components have the same amplitude

What is the transmission bandwidth required for a narrowband FM signal?

2𝑓𝑚 (C) Signup and view all the answers

What is the role of the modulation index 𝛽 in determining the number of sideband components in an FM signal?

It determines the number of sideband components (D) Signup and view all the answers

What is the condition for an FM signal to be classified as a wideband FM signal?

𝛽 ≫ 1 or ∆𝑓 ≫ 𝑓𝑚 (D) Signup and view all the answers

What is the approximate bandwidth required for a wideband FM signal?

2∆𝑓 (D) Signup and view all the answers

What is the significance of Carson's Rule in FM signal transmission?

It determines the transmission bandwidth for an FM signal (A) Signup and view all the answers

What is the symmetrical property of sidebands in an FM signal?

Each sideband is at a similar distance to 𝑓𝑐 (A) Signup and view all the answers

What is the significance of the Bessel table in FM signal transmission?

It provides the coefficient 𝐽𝑛(𝛽) for calculating the amplitude of sidebands (A) Signup and view all the answers

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