Explain the need of modulation for the long range transmission
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The baseband signals can be transmitted directly, but the baseband transmission has many limitations which can be overcome using modulation.
In the process of modulation, the baseband signal is translated i.e. shifted from low frequency to high frequency.
This frequency shift is proportional to the frequency of carrier.
The modulation process has the following advantages:
Reduction in the height of antenna
Avoids mixing of signals
Increase the range of communication
Multiplexing is possible
Improves quality of reception
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