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Analog Transmission
ANALOG AND DIGITAL
Analog-to-analog conversion is the representation of
analog information by an analog signal. One may ask
why we need to modulate an analog signal; it is
already analog. Modulation is needed if the medium is
bandpass in nature or if only a bandpass channel is
available to us.
 Amplitude Modulation
 Frequency Modulation
 Phase Modulation
Topics discussed in this section:
Types of analog-to-analog modulation
Amplitude Modulation
 A carrier signal is modulated only in
amplitude value
 The modulating signal is the envelope of the
carrier
 The required bandwidth is 2B, where B is the
bandwidth of the modulating signal
 Since on both sides of the carrier freq. fc, the
spectrum is identical, we can discard one half,
thus requiring a smaller bandwidth for
transmission.
Amplitude modulation
The total bandwidth required for AM
can be determined
from the bandwidth of the audio
signal: BAM = 2B.
AM band allocation
5.8
Frequency Modulation
 The modulating signal changes the freq.
fc of the carrier signal
 The bandwidth for FM is high
 It is approx. 10x the signal frequency
The total bandwidth required for FM can
be determined from the bandwidth
of the audio signal: BFM = 2(1 + β)B.
Where  is usually 4.
Frequency modulation
FM band allocation
Phase Modulation (PM)
 The modulating signal only changes the
phase of the carrier signal.
 The phase change manifests itself as a
frequency change but the instantaneous
frequency change is proportional to the
derivative of the amplitude.
 The bandwidth is higher than for AM.
Phase modulation
The total bandwidth required for PM can
be determined from the bandwidth
and maximum amplitude of the
modulating signal:
BPM = 2(1 + β)B.
Where  = 2 most often.
AM Problems:
Problem 3: When the modulation percentage is 75%, an AM
transmitter radiates 10KW Power. How much of this is carrier
Power?
Problem 4: The total Power content of an AM signal is 1000W.
Determine the power being transmitted at carrier frequency
and at each side bands when modulation percentage is 100%
Problem 5: Calculate the percentage power saving when one
side band and carrier is suppressed in an AM signal with
modulation index equal to 1
FM Numericals:
FM-PM.ppt
FM-PM.ppt
FM-PM.ppt
FM-PM.ppt
FM-PM.ppt
FM-PM.ppt
FM-PM.ppt

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FM-PM.ppt

  • 2. ANALOG AND DIGITAL Analog-to-analog conversion is the representation of analog information by an analog signal. One may ask why we need to modulate an analog signal; it is already analog. Modulation is needed if the medium is bandpass in nature or if only a bandpass channel is available to us.  Amplitude Modulation  Frequency Modulation  Phase Modulation Topics discussed in this section:
  • 4. Amplitude Modulation  A carrier signal is modulated only in amplitude value  The modulating signal is the envelope of the carrier  The required bandwidth is 2B, where B is the bandwidth of the modulating signal  Since on both sides of the carrier freq. fc, the spectrum is identical, we can discard one half, thus requiring a smaller bandwidth for transmission.
  • 6. The total bandwidth required for AM can be determined from the bandwidth of the audio signal: BAM = 2B.
  • 8. 5.8 Frequency Modulation  The modulating signal changes the freq. fc of the carrier signal  The bandwidth for FM is high  It is approx. 10x the signal frequency
  • 9. The total bandwidth required for FM can be determined from the bandwidth of the audio signal: BFM = 2(1 + β)B. Where  is usually 4.
  • 12. Phase Modulation (PM)  The modulating signal only changes the phase of the carrier signal.  The phase change manifests itself as a frequency change but the instantaneous frequency change is proportional to the derivative of the amplitude.  The bandwidth is higher than for AM.
  • 14. The total bandwidth required for PM can be determined from the bandwidth and maximum amplitude of the modulating signal: BPM = 2(1 + β)B. Where  = 2 most often.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30. Problem 3: When the modulation percentage is 75%, an AM transmitter radiates 10KW Power. How much of this is carrier Power?
  • 31. Problem 4: The total Power content of an AM signal is 1000W. Determine the power being transmitted at carrier frequency and at each side bands when modulation percentage is 100%
  • 32. Problem 5: Calculate the percentage power saving when one side band and carrier is suppressed in an AM signal with modulation index equal to 1