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a pulse communication signal consists of 25khz energy every 1.25ms that last 0.2ms. (i) sketch the pulse communication signal [2 marks] [2 marks] (ii) sketch

a pulse communication signal consists of 25khz energy every 1.25ms that last 0.2ms. (i) sketch the pulse communication signal [2 marks] [2 marks] (ii) sketch the envelope of the pulse signal (iii) using fourier series, determine the frequency spectrum of the signal noting the atmospheric pollution it produces. [13

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