Question

why is modulation necessary

Answer 1

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 modulatea signal is to allow the use of a smaller antenna.

Answer 2

modulation allows us to send a signal over a bandpass frequency range. if every signal get it's own frequency range , then we can transmit multiple signals simultaneously over a single channel, all using different ranges.
another reason to modulate a signal is to allow the use of a smaller antenna.
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