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What is the Frequency Spectrum of Communication Systems? Why Modulation is necessary in wireless transmission?

What is the Frequency Spectrum of Communication Systems? Why Modulation is necessary in wireless transmission?

We shall discuss in this article about the Frequency Spectrum of Communication Systems? Why Modulation is necessary. When signal is transmitted over an antenna, it is first converted into equivalent electromagnetic waves and after that the electromagnetic waves detach from antenna and travel into free space.
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