A signal occupies the spectrum space from 1115 to 1122 GHz The bandwidth is Ans

A signal occupies the spectrum space from 1115 to

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30. A signal occupies the spectrum space from 1.115 to 1.122 GHz. bandwidth is The 31. In the united states, the electromagnetic spectrum is regulated and managed by 32. For a given bandwidth signal, more channel space is available for signals in the range of Chapter 2: AM and SSB Modulation 1. Having an information signal change some characteristic of a carrier signal is called 2. Which of the following is not true about AM? 3. The opposite of modulation is 4. The circuit used to produced modulation is called a 5. A modulator circuit performs mathematical operation on its inputs? what two 6. The ratio of the peak modulating signal voltage to the peak carrier voltage is referred to as 7. If mis greater than 1, what happens? 8. For ideal AM, which of the following is true? 9. The outline of the peaks of a carrier has the shape of the modulating signal and is called the 10. Overmodulation occurs when 11. The values of Vmax and Vmin as read from an AM wave on an oscilloscope are 2.8 and 0.3. The percentage of modulation is 12. The new signals produced modulation are called by 13. A carrier of 880 kHz is modulated by a 3.5 kHz sine wave. The LSB and USB are, respectively, 14. A display of signal amplitude versus frequency is called the 15. Most of the power in an AM signal is the 16. An AM signal has a carrier power of 5 W. The percentage of modulation is 80 percent. The total sideband power is 17. For 100 percent modulation, percentage of power is in sideband? what each 18. An AM transmitter has a percentage of modulation of 88. The carrier power is 440 W. The power in one sideband is 19. An AM transmiiter antenna current is measured with no modulation and found to be 2.6 A. With modulation, the current rises to 2.9 A. The percentage of modulation is 20. What is the carrier power in the problem above if the antenna resistance is 75 ohms? 21. In an AM signal, the transmitted information is contained within the 22. An AM signal without the carrier is called a(n)
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©2008 Created by Kai Raimi – BHC COMMUNICATION ELECTRONIC 2 ND EDITION - FRENZEL 3
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