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Intro to Telecommunications

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Submitted By LaughingMan01
Words 452
Pages 2
Peter Vallejo
Intro to Telecommunications
September 30, 2015
Chapter 2 Amplitude Modulation: Transmission 1. A 1500-kHz carrier and 2-kHz intelligence signal are combined in a nonlinear device. List all the frequency components produced. 1498, 1500 and 1520kHz 2. If a 1500-kHz radio wave is modulated by a 2-kHz sine-wave tone, what frequencies are contained in the modulated wave (the actual AM signal)? 3. If a carrier is amplitude-modulated, what causes the sideband frequencies? The non-linear mixing of the carrier and intelligence frequencies. 4. What determines the bandwidth of emission for an AM transmission? It is twice the frequency of the highest audio frequency transmitted. The upper sideband is fc +FM where fc is the carrier frequency and FM is the modulation (audio) frequency. The lower sideband is fc-FM. The total band
10. What are some of the possible results of overmodulation?
19. Why is a high percentage of modulation desirable?
20. During 100 percent modulation, what percentage of the average output power is in the sidebands? (33.3%)
23. Describe two possible ways that a transistor can be used to generate an AM signal.
24. What is low-level modulation?
25. What is high-level modulation?
27. Why must some radio-frequency amplifiers be neutralized?
29. Define parasitic oscillation. Higher frequency self-oscillations in RF amplifiers.
30. How does self-oscillation occur?
32. What is the principal advantage of a class C amplifier?
35. Draw a block diagram of an AM transmitter.
36. What is the purpose of a buffer amplifier stage in a transmitter?
38. Draw a simple schematic diagram showing a method of coupling the radio-frequency output of the final power amplifier stage of a transmitter to an antenna.
39. Describe the functions of an antenna coupler.
41. What is a tune-up procedure?
43. Explain the advantages of the trapezoidal display over a standard oscilloscope display of AM signals.
48. What is the purpose of a dummy antenna?
51. When troubleshooting, what is the purpose of inspection? Describe the various steps involved in this process.
52. After a repair has been made, how is a hot check accomplished?
54. Explain the dangers of working on high-power transmitters and describe the precautions that should be taken.
55. Describe why and how a dummy load is used in checking the output of a transmitter. Why is the impedance of the dummy load an important consideration?
60. Describe some of the physical defects of a system that are obvious to the eye.
62. You are analyzing an AM waveform. What significance do the upper and lower envelopes have?
64. Compare the display of an oscilloscope to that of a spectrum analyzer.
iNT

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