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* Without modulation, size of the antenna will become very large and it will make antenna size in order of km for message signal of kHz order.
* For reliable and effective communication over long distance i.e. minimizing the signal losses during transmission.
* As signal band is limited (from few MHz to maybe some GHz) we have to use as low bandwidth of signal as low as possible. (i.e. maximizing the use of bandwidth allocated) <br \><br \><br \>
== How to decide type of Modulation? ==