write two factors justifying the need of modulating a signal.
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Kindly refer to the link given below for an answer to a similar query.
https://www.meritnation.com/ask-answer/question/why-do-we-need-to-modulate-the-frequency/communication-systems/3627262
Hope this information will clear your doubts about the topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.