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In angle modulation, signal to noise ratio before detection is a function of ______

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In angle modulation, signal to noise ratio before detection is a function of ______

(a) Modulation index

(b) Input signal to noise ratio

(c) Maximum frequency of the message

(d) IF filter bandwidth

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Query is from Angle modulation topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right option is (d) IF filter bandwidth

Easy explanation: In angle modulation systems, the signal to noise ratio before detection is the function of the receiver IF filter bandwidth, received carrier power, and received interference. However, signal to noise ratio after detection is a function of maximum frequency of the message, input signal to noise ratio and modulation index.

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