Question: Question 1 [Soalan 1] (a) Given one input to an AM modulator is 25 kHz with amplitude of 14Vp. The second input is 3

Question 1 [Soalan 1] (a) Given one input to an AM modulator

Question 1 [Soalan 1] (a) Given one input to an AM modulator is 25 kHz with amplitude of 14Vp. The second input is 3 kHz signal with amplitude of 8Vp. [Diberi satu masukan ke modulator AM adalah bernilai 25 kHz dengan amplitud 14Vp. Masukan kedua bernilai 3kHz dengan amplitud 8Vp.] (i) (b) Calculate the upper side frequency, lower side frequency, modulation index and percentage modulation. (iv) [Kirakan frekuensi jalur sisi atas, frekuensi jalur sisi bawah, indeks modulasi dan peratusan modulasi.] (4 Marks / Markah) Determine the peak amplitude of the modulated carrier, the upper and lower side frequency voltages and the maximum and minimum amplitudes of the envelope. [Tentukan amplitud puncak daripada pembawa termodulat dan voltan frekuensi jalur sisi atas dan bawah dan amplitud maksimum dan minimum sampul.] (4 Marks / Markah) (iii) Produce the mathematical expression for the modulated signal. Predict what would happen if 18V, modulating signal, amplitude modulated a 15V, carrier signal? [Hasilkan persamaan matematik bagi isyarat termodulat. Jangkakan apakah yg terjadi sekiranya 18Vp isyarat pemodulat, dimodulat amplitud oleh 15Vp isyarat pembawa?] (5 Marks/Markah) Draw and label the output envelope and the frequency spectrum. [Lukis keluaran sampul dan spektrum frekuensi.] (4 Marks / Markah) Explain the features of Quadrature Amplitude Modulation (QAM) and its application. [Terangkan ciri-ciri Modulasi Amplitud Kuadratur (QAM) dan kegunaannya.] (3 Marks / Markah)

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