# Homework Q

May 5th, 2015
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Understanding Modulation. Before you conduct the Week 1 Lab, read the following tutorial on AM and FM modulation. Part 1—Amplitude Modulation.

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Homework QUnderstanding ModulationBefore you conduct the Week 1 Lab, read the following tutorial on AM and FM modulation. -------------------------------------------------Part 1Amplitude Modulation| |Amplitude Modulation - Overview| |* AM signals are transmitted over several bands. AM transmission is governed and regulated by the International Telecommunications Union (ITU). * Commercial broadcast AM uses the range from 530 KHz to 1,710 KHz. * Short waves use the range 2.330 MHz.* Short wave transmission can be received worldwide as frequencies up to 30 MHz. These are reflected back by the ionosphere and make several bounces before being received. * Commercial broadcast AM has a bandwidth of 10 KHz. The maximum intelligence frequency in commercial broadcast AM is 5 KHz. * The AM family includes side bands. The above equation represents a sinusoidal carrier. 1. If A (peak amplitude) is varied in step with amplitude variations in intelligence, we have anAM (amplitude modulation) signal. 2. If fc (carrier frequency) is varied in step with amplitude variations in intelligence, we have an FM (frequency modulation) signal. 3. If (carrier phase angle) is varied in step with amplitude variations in intelligence, we have a PM (phase modulation) signal. AM DefinitionAmplitude modulation is a process in which the peak amplitude of a high-frequency signal (carrier) is made to vary in direct proportion to the amplitude variations in a low-frequency signal (info

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