Difine modulation.why is it necessary?
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Modulation allows us to send a signal over a bandpass frequency range. If every signal gets its own frequency range, then we can transmit multiple signals simultaneously over a single channel, all using different frequency ranges. Another reason to modulate a signal is to allow the use of a smaller antenna.
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The following planning is required to deal with the situation created by a cyclone: Facilities forcyclone prediction and forecasting which can give cyclone warning inadvance. Quick information and communication linkages so that information can be spread quickly.
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