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A message signal has a bandwidth of 30 kHz. Efficient radiation from an antenna requires that the antenna length be at least a tenth

 

A message signal has a bandwidth of 30 kHz. Efficient radiation from an antenna requires that the antenna length be at least a tenth of the transmitted signal wavelength. Determine the minimum antenna length for efficient radiation if: (a) it is to be broadcast without the benefit of modulation, (b) it is broadcast after it is amplitude-modulated with a sinusoidal carrier having a frequency that is 100 times the bandwidth of the message signal.

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