Tutorial Chapter 2 - Tutorial 2 Amplitude Modulation(AM...

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Tutorial 2: Amplitude Modulation (AM)____________________ BENT 3753: Communication Principles 1 Questions: 1. Define amplitude modulation 2. Draw block diagram of an amplitude modulator, state it’s inputs and output 3. Describe upper and lower sidebands and the upper and lower side frequencies 4. For an AM DSBFC modulator with a carrier frequency c f = 200 kHz and a maximum modulating signal (max) m f = 15 kHz, determine a. Frequency limits for the upper and lower sidebands b. Bandwidth c. Upper and lower side frequencies produced when the modulating signal is a single frequency 7 kHz tone d. The output frequency spectrum 5. What is the maximum modulating signal frequency that can be used with an AM DSBFC system with a 25 kHz bandwidth? 6. What are the relationship between the modulating signal frequency and the bandwidth in a conventional AM system? 7. Define modulation coefficient and percent modulation 8. Describe the meaning of each term in the following expression: ) 485 2 cos( 5 ) 515 2 cos( 5 ) 500 2 sin( 10 ) ( kt kt kt t v am π + - = 9. For a p V 20
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  • Spring '14
  • Vmin, percent modulation

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