Communications Engineering Coaching Materials: Section 1 Module 1

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(Last Updated On: February 18, 2020)

Communications Coaching Materials: Section 1 Module 1

This is the Section 1 Module 1 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

Communications Engineering Coaching: Section 1 Module 1

1. GPRS – does not need packets

2. 9476 mi – average height of GPS

3. GPRS uplink – 14 kHz or 14 kbps

4. preamble – for synching Ethernet

5. 15 to 60 – gain of rhombic antenna

6. ½ to 2/3 – effective height of antenna compared to actual antenna height

7. Erlang B – traffic model used

8. Poisson’s equation – It is used, for instance, to describe the potential energy field caused by a given charge or mass density distribution.

9. Class III Catv channel – auxiliary equipment required

10. turnstile antenna – 2 dipoles 90 degrees apart

11. REM = RBE x RAD

12. 1 RBE = 10 for alpha particles and fast neutrons

13. reb – roentgen effective bio

14. rep – roentgen effective physical

15. rem – roentgen effective man

16. GPRS – 172.2 kbps

17. Auditorium reverberation time – 1.6 to 1.8 s

18. Neodymium Laser – 1.3µs or 1.3µm light

19. plastic fiber cables – red LED used

20. A and B weighting curve – response of human ear

21. Max Bluetooth range – 10m

22. MPEG 7 – Multimedia content Description Interface

23. Beverage antenna – “wave antenna”; 2 lambda

24. 4 degrees separation = 1833 miles

25. P 300 – maintenance cost for CATV

26. 52 degrees C – damage a crystal microphone

27. IMT 2000 – 1920 to 1980 MHz

28. Low Z microphones – dynamic, carbon, ribbon

29. High Z microphones – crystal, condenser, electret

30. TWT – interaction between e beam and RF field; linear path

31. Tunnel Diode – low power microwave oscillator

32. klystron and magnetrons – high power oscillators

33. secondary payload – smaller satellite

34. BNC – (Bayonet Neill–Concelman) connector for oscillators and lab instruments

35. Bell Labs – first cellular phone in 1924

36. Doghouse – temperature controlled enclosure for equipment

37. Erbium-doped fiber – 1.53µm to 1.63µm light

38. Celotex – high absorption of sound

39. Ethernet – bus topology most common

40. Network admin – gives passwords to LAN

41. Foster-Seeley discriminator – requires limiters

42. Ratio detector – does not require limiter

43. 50Ω – typical impedance of waveguide

44. RG62 – 93Ω

45. AWG 22 – Telephones – 120 Ω/loop mile

46. pink noise – flicker noise

47. discordant interval – unpleasant intervals of sound

48. 40% – microwave maximum obstructions

49. autodyne – LO + mixer in one

50. 1 mel = 1 Hz at 40dB

51. via net loss – to reduce singing or echo

52. root note – 1st note in musical scale

53. C – root note of diatonic scale

54. 1st octave of human hearing – 20 to 40 Hz

55. telephone channel – 4 octaves

56. Xmodem – used check sum

57. microwave transmission lines:

a. stripline = coax

b. microstrip = parallel wire

58. power of CB radio – 4W

59. X.25 – packet switching

60. ATM – 1 byte = 1 octet

61. ATM – virtual circuit identifier

62. Videocom – vacuum tube picture tube

63. sound carrier cable – 41.25 MHz

64. video carrier cable – 45.75 MHz

65. MIN + ESN (electronic serial number) – for billing tracking

66. phone – number assignment mobile (NAM) – for assignment of phone number

67. Local no. Portability – returning same features when switching carriers

68. GPRS – GMSK

69. EDGE – PSK

70. Lambertian effect/scattering – part of incoming light is absorbed part is radiated

71. Intensity Modulator – analog mod used for fiber optics

72. FDDI – fiber distribution data interface

73. LMDS – local multipoint distribution service; 28 GHz; internet, for home

74. MMDS – multichannel multipoint distribution service; many people; wireless cable; 2.5 – 2.686 GHz

75. Hotline – no need for dial tone

76. dial tone delay – interval between off hook and dial tone

77. comb filter – separates Y and chroma

78. North and South poles – hard to service by geosynch satellites because of low elevation angle

79. FCC – phase out analog TV by 2006 in US

80. 19.2 kbps – Cellular Digital Packet Data (CDPD); packets over voice channel

81. AMPS – supervisory audio tone

82. D-AMPS – CDVCC (Coded Digital Verification Color Code)

83. 10/13/1983 – 1st commercial telephone service by NTT

84. TACAN – 960 M to 1215 M

85. VOR – 108 to 118M

86. Smith chart – transmission line calculator

87. VDSL – 52 Mbps downstream/ 2.3 Mbps upstream

88. H21 – 32.768 Mbps

89. B channel of ISDN – email; 4.8 to 64 kbps

90. chirp – SS technique; carrier frequency is linearly moved or shifted through its BW

91. WAP – for sharing via wireless access instead of wires

92. WEP – wired equivalent privacy; 64/128/256 bit encryption

93. SEG – for special effects in TV (special effects group)

94. IVDS – Interactive Video and Data Service; 218-218.5/218.5-219 MHz

95. rad – amount of exposure

96. rbe – biological impact

97. Y video – requires 0.8µs delay

98. temporary permit of MPSCD – 3 months

99. Office Order 86-8-2004 – permit for MPSCD

Complete List of Communications Engineering Coaching Materials

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