Frenzel Self-test in Amplitude Modulation Circuits – Answers

(Last Updated On: February 9, 2020)

Answers for Frenzel Self-test in Amplitude Modulation Circuits

Below are the answers key for Frenzel Self-test in Chapter 3: Amplitude Modulation Circuits from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. a

2. b

3. c

4. gain, attenuation

5. square law

6. diode

7. tuned circuit

8. variable resistor

9. gain

10. increase, decrease, increase

11. resistor

12. 100 MHz

13. attenuator

14. low

15. linear amplifier

16. C

17. collector

18. supply voltage

19. 2.5

20. 12

21. driver

22. demodulator

23. diode detector


25. ripple, distortion

26. envelope

27. smaller filter capacitor, less ripple and distortion

28. true

29. c

30. d

31. b

32. lattice modulator or diode ring

33. switches

34. 1897.4, 1902.6

35.Q7, Q8

36. switches

37. true

38. filter

39. selectivity

40. 2.9985

41. crystals

42. Use one filter for each sideband; select the carrier frequency so that the desired sideband is in the filter passband.

43.tune, resonant, or LC

44. 1.8 (3.0012- 3.0 = 0.0012 MHz = 1.2 kHz; 1.2 x 1.5 = 1.8 kHz)

45. vibrate or resonate

46. crystal

47. 200 to 500

48. phase shift

49. mixer or balanced modulator

50. product detector

51. b

52. b

53. b

54. heterodyning

55. frequency conversion or translation

56. f1 ,f2, f1 + f2, f1 – f2

57. diode

58. doubly balanced mixer, GaAsFET

59. gain

60. 455 (1845 – 1390 = 455)

61. converter

62. cross-connected differential amplifier

63. local oscillator

64. 21.3 or 32.3 MHz

65. true

66. true

Complete List of Self-test and Reviewers in Communications Electronics

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