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Modulation
- AM power distribution
- Current calculations
- Current calculations
- Calculation of modulation index
- Bandwidth / frequency range
- BW increases with increase in rate of data transmission
- BW increases with increase in rate of data transmission
- Types of modulation
- Analog modulation
- Digital modulation
- Analog modulation
- Modulation by complex signals
- Mathematical representation
- Time domain description
- Frequency domain discription
- Time domain description
- Why modulate
- Reduces antenna height
- lamda = speed of light / frequency
- height of antenna = lamda / 4
- height of antenna = lamda / 4
- lamda = speed of light / frequency
- Avoids mixing of signals
- Frequency slot allocation
- Frequency slot allocation
- Increases range of communication
- frequency increases / attenuation decreases
- frequency increases / attenuation decreases
- Improves signal reception quality
- Signal noise reduces due to modulation techniques
- Signal noise reduces due to modulation techniques
- Reduces antenna height
- AM transmitters
- Low level
- High level
- Low level
- Disadvantage
- power inefficient
- Bandwidth inefficient
- Prone to noise
- power inefficient
- Modulation index
- Linear modulation m<=1
- Over modulation
- Linear modulation m<=1
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