? QUESTION 9 When comparing FM and PM which of the following is true? O For the
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QUESTION 9 When comparing FM and PM which of the following is true? O For the same modulation index and message frequency the bandwidth is the same for both PM and FM O For the same modulation index and message frequency the bandwidth is higher for PM than FM ● For the same modulation index and message frequency the bandwidth is lower for PM than FM ● For the same modulation index and message frequency the bandwidth is lower for PM than FM only if the message amplitude is the same for both cases. QUESTION 10 AVCO produces an FM signal given by y(t)=13cos((2π × 55×106 )t +4sin(2x10³)). This signal is then passed through a mixer whose local oscillator is 80 MHz. What is the new carrier frequency (MHz) at the output of the mixer? You may assume that the higher frequency is passed to the output of the mixer. QUESTION 11 An FM modulator has a kf = 1 kHz/V. A single tone message with an amplitude of 2 volt and frequency of 1 kr/s is used as the modulating signal. What is the modulation index (b) in this case? QUESTION 12 A DSB-LC modulator has a modulation index m=0.3. Assuming single tone modulation, what is the strength of the upper sidetone if Ac=53V ? QUESTION 13 A DSB-LC signal given by y(t)=13(1+mx(t))cos(97x2x10³). This signal is then passed through an x3 frequency multiplier. The frequency (khz) of the AM signal at the output of the frequency multiplier is? QUESTION 9 When comparing FM and PM which of the following is true? O For the same modulation index and message frequency the bandwidth is the same for both PM and FM O For the same modulation index and message frequency the bandwidth is higher for PM than FM ● For the same modulation index and message frequency the bandwidth is lower for PM than FM ● For the same modulation index and message frequency the bandwidth is lower for PM than FM only if the message amplitude is the same for both cases. QUESTION 10 AVCO produces an FM signal given by y(t)=13cos((2π × 55×106 )t +4sin(2x10³)). This signal is then passed through a mixer whose local oscillator is 80 MHz. What is the new carrier frequency (MHz) at the output of the mixer? You may assume that the higher frequency is passed to the output of the mixer. QUESTION 11 An FM modulator has a kf = 1 kHz/V. A single tone message with an amplitude of 2 volt and frequency of 1 kr/s is used as the modulating signal. What is the modulation index (b) in this case? QUESTION 12 A DSB-LC modulator has a modulation index m=0.3. Assuming single tone modulation, what is the strength of the upper sidetone if Ac=53V ? QUESTION 13 A DSB-LC signal given by y(t)=13(1+mx(t))cos(97x2x10³). This signal is then passed through an x3 frequency multiplier. The frequency (khz) of the AM signal at the output of the frequency multiplier is?
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B lo x 2 pres rct Fo FM PM C Bandaiate 2CR1 fm Bmoduahian s... View the full answer
Related Book For
Auditing and Assurance Services
ISBN: 978-0077862343
6th edition
Authors: Timothy Louwers, Robert Ramsay, David Sinason, Jerry Straws
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