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On radiating (sending out) an AM modulated signal, the total radiated power is due to energy carried by ωc, ωc – ωm & ωc + ωm. Suggest ways to minimise cost of radiation without compromising on information.

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Of  ωc – ωmωc and ωc + ωm, only ωc + ωm or  ωc – ωm contains information. Hence cost can be reduced by transmitting ωc + ωm ωc – ωm, both ωc + ωm &  ωc – ωm

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