Free Essay

Electronic Communiations

In: Computers and Technology

Submitted By dallas90
Words 306
Pages 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)?
2. *If a carrier is amplitude-modulated, what causes the sideband frequencies?
3. *What determines the bandwidth of emission for an AM transmission?
4. Explain the difference between a sideband and a side frequency.
5. *Draw a diagram of a carrier wave envelope when modulated 50 percent by a sinusoidal wave.
Indicate on the diagram the dimensions from which the percentage of modulation is determined.
6. *What are some of the possible results of overmodulation?
7. A 100-V carrier is modulated by a 1-kHz sine wave. Determine the sidefrequency amplitudes when m = 0.75.
8. *Why is a high percentage of modulation desirable?
9. *During 100 percent modulation, what percentage of the average output power is in the sidebands?
10. *Draw a block diagram of an AM transmitter.
11. *Draw a diagram of a tuned radio-frequency (TRF) radio receiver.
12. *Explain the following: sensitivity of a receiver; selectivity of a receiver. Why are these important characteristics? In what units are they usually expressed?
13. Explain why a receiver can be overly selective.
14. Describe the advantages and disadvantages of a diode detector.
15. Provide the advantages of a synchronous detector compared to a diode detector. Explain its principle of operation.
16. *Draw a block diagram of a superheterodyne AM receiver. Assume an incident signal, and explain briefly what occurs in each stage.
17. *Explain the purpose and operation of the first detector in a superhet receiver.
18. An AM transmission of 1000 W is fully modulated. Calculate the power transmitted if it is transmitted as an SSB signal.
19. List and explain the advantages of SSB over conventional AM transmissions. Are there any
disadvantages?

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