QUESTION ONE [25 MARKS] A. A cosine carrier of frequency 1 MHz and unit amplitude ( A. =1) is FM tone-modulated by a cos

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Question One 25 Marks A A Cosine Carrier Of Frequency 1 Mhz And Unit Amplitude A 1 Is Fm Tone Modulated By A Cos 1 (52.72 KiB) Viewed 11 times

QUESTION ONE [25 MARKS] A. A cosine carrier of frequency 1 MHz and unit amplitude ( A. =1) is FM tone-modulated by a cosine modulation of unit amplitude ( A. =1), modulation frequency 1 kHz (f. =1000) with a frequency deviation fs = 3000. Fill in a tabular with headings as indicated in the table below with the numerical frequency and numerical average signal power (not amplitude) of the six strongest sinusoidal components in the frequency spectrum of the modulated carrier. Bessel table is provided. Note: The average signal power of any sinusoid is one-half of the square of its amplitude. [18 marks] Sideband frequency (MHz) Signal power (W) Sideband 14 B. An ordinary AM modulated signal with an output wave that changes by 87.5 V is represented by the following equation $(t) = 20 sin(2x500x10°)t - 3.75 cos (21510x10')t +3.75 cos (2.490x10') Based on the information given, i. Determine the modulation index, m and percent modulation. [1 mark] ii. Determine the peak amplitude of the modulated carrier, upper and lower side frequency voltages. [2 marks] iii. Determine the maximum and minimum amplitude of the envelope. [2 marks] iv. Sketch and label the output envelope. [2 marks]