The shown diagram is for an Armstrong indirect modulator. If the input message m(t) has a...

 

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The shown diagram is for an Armstrong indirect modulator. If the input message m(t) has a bandwidth of 20 kHz and the modulated signal S(t) has Af= 32.256 kHz and carrier frequency 106.1MHz, find Af at (a) in Hz. m(1) a(1) DSB-SC modulator -A sin !↑ A cos a A. 14 Hz B. 10.5 Hz C. 64 Hz D. 21 Hz E. 84 Hz -r/2 Crystal oscillator 200 kHz (a) Frequency multiplier X 64 (b) Frequency converter Crystal oscillator 10.9 MHz (c) Frequency multiplier X 48 s(t) Power amplifier Which of the following is NOT true about QAM: A. QAM is used to send two signals, one over cosine and the other over sine waves. B. Frequency mismatch in QAM results in co-channel interference. C. Phase mismatch in QAM results in loss in receiver SNR. D. Frequency mismatch in QAM results in loss in receive SNR. E. Phase mismatch in QAM results in loss in receive signal power. In M-ary multi-amplitude modulation, when the transmission bandwidth is kept fixed as M increases, which of the following is true? A. The transmission rate in bps increases B. The transmission rate in bps decreases C. The average transmission power decreases D. The average BER decreases E. The average BER increases The shown diagram is for an Armstrong indirect modulator. If the input message m(t) has a bandwidth of 20 kHz and the modulated signal S(t) has Af= 32.256 kHz and carrier frequency 106.1MHz, find Af at (a) in Hz. m(1) a(1) DSB-SC modulator -A sin !↑ A cos a A. 14 Hz B. 10.5 Hz C. 64 Hz D. 21 Hz E. 84 Hz -r/2 Crystal oscillator 200 kHz (a) Frequency multiplier X 64 (b) Frequency converter Crystal oscillator 10.9 MHz (c) Frequency multiplier X 48 s(t) Power amplifier Which of the following is NOT true about QAM: A. QAM is used to send two signals, one over cosine and the other over sine waves. B. Frequency mismatch in QAM results in co-channel interference. C. Phase mismatch in QAM results in loss in receiver SNR. D. Frequency mismatch in QAM results in loss in receive SNR. E. Phase mismatch in QAM results in loss in receive signal power. In M-ary multi-amplitude modulation, when the transmission bandwidth is kept fixed as M increases, which of the following is true? A. The transmission rate in bps increases B. The transmission rate in bps decreases C. The average transmission power decreases D. The average BER decreases E. The average BER increases

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