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(4 points) The RS-232 port on a PC transmits data at 38.4 kbps using polar NRZ line code. What is the null to null bandwidth

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(4 points) The RS-232 port on a PC transmits data at 38.4 kbps using polar NRZ line code. What is the null to null bandwidth for this signal? What is the rate (as a function of frequency f) at which the power spectrum falls off? Can you suggest a strategy to increase the spectrum roll off rate to reduce out of band radiation

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