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What is the maximum carrier frequency to be used if the upper limit frequency that is available is 4000Hz and the frequency of the modulating signal is 100Hz?

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What is the maximum carrier frequency to be used if the upper limit frequency that is available is 4000Hz and the frequency of the modulating signal is 100Hz?

(a) 4100Hz

(b) 4000Hz

(c) 400Hz

(d) 3900Hz

I have been asked this question in final exam.

I'd like to ask this question from Sidebands and Frequency Domain in division Amplitude & Frequency Modulation of Avionics

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Correct choice is (d) 3900Hz

For explanation I would say: Upper sideband frequency = carrier signal frequency + modulating signal frequency.

Carrier frequency = upper sideband frequency -modulating signal frequency= 4000Hz – 100HZ = 3900hZ.

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