1. A carrier with a frequency of 20 MHz and amplitude of 20V is amplitude modulated y an audio signal of 10KH2 frequency and 5V amplituđe a. Estimate the depth of modulation b. What is the upper side frequency (in MHz) What is the amplituđe of the lower side frequency in (volts)

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An AM signal given by is to be detected to extract the information signal. If a synchronous detector is used What is the required local oscillator frequency (in KHz) What should be the minimum bandwidth (in KHz) of the low pass filter required for the extraction of the information signal.
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ASSIGNMENT FIVE
1.
A carrier with a frequency of 20 MHz and amplitude of 20V is amplitude modulated y an
audio signal of 10KHZ frequency and 5V amplituđe
a. Estimate the depth of modulation
b.
What is the upper side frequency (in MHz)
What is the amplitude of the lower side frequency in (volts)
2.
A double sideband AM radio transmitter gives an output power of 20 KW when the carrier is
modulated with a sinewave tone to a depth of 80%, Determine
a. The carrier power (in KW)
b. ,
The carrier current (in amps), if a load resistance of 20 is assumed.
The peak current of the modulated wave
3. An AM signal given by s(t) = 10[1+0,45sin4rx10't|sin?nx10't is to be detected to extract the
information signal, If a synchronous detector is used
a.
What is the required local oscillator frequency (in KHz)
b.
What should be the minimum bandwidth (in KHz) of the low pass filter required for the
extraction of the information signal,
4. If the AM signal of Question 3 is passed through a full wave bridge rectifier, followed by a
low pass filter, in an envelope đetection process and the rectifier and filter is assumed to
introduce an attenuation factor of K=0,65
a,
Estimate the value of the dc, component at the output of the filter (in volts)
b. What is the amplitude of the modulating signal at the output of the filter (in volts)
5. A communication system consists of five cascaded sections A, B, C,D and E, Measurements
carried out to đetermined the gain of each channel yielded the following results,
Channel
Vin (volts)
Vout(volts)
3,0
15.0
B
2,0
10,0
5,0
1,0
D
1,0
10.0
4,0
0,5
DO
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Transcribed Image Text:12:28 161 . 95% D KB/s Edit 88 18 $ ASSIGNMENT FIVE 1. A carrier with a frequency of 20 MHz and amplitude of 20V is amplitude modulated y an audio signal of 10KHZ frequency and 5V amplituđe a. Estimate the depth of modulation b. What is the upper side frequency (in MHz) What is the amplitude of the lower side frequency in (volts) 2. A double sideband AM radio transmitter gives an output power of 20 KW when the carrier is modulated with a sinewave tone to a depth of 80%, Determine a. The carrier power (in KW) b. , The carrier current (in amps), if a load resistance of 20 is assumed. The peak current of the modulated wave 3. An AM signal given by s(t) = 10[1+0,45sin4rx10't|sin?nx10't is to be detected to extract the information signal, If a synchronous detector is used a. What is the required local oscillator frequency (in KHz) b. What should be the minimum bandwidth (in KHz) of the low pass filter required for the extraction of the information signal, 4. If the AM signal of Question 3 is passed through a full wave bridge rectifier, followed by a low pass filter, in an envelope đetection process and the rectifier and filter is assumed to introduce an attenuation factor of K=0,65 a, Estimate the value of the dc, component at the output of the filter (in volts) b. What is the amplitude of the modulating signal at the output of the filter (in volts) 5. A communication system consists of five cascaded sections A, B, C,D and E, Measurements carried out to đetermined the gain of each channel yielded the following results, Channel Vin (volts) Vout(volts) 3,0 15.0 B 2,0 10,0 5,0 1,0 D 1,0 10.0 4,0 0,5 DO פם Tools Mobile View Share School Tools O
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