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Communications 1 > Introduction to Electronic Communications > Flashcards

Introduction to Electronic Communications Flashcards

1
Q

Defined as the basic process of exchanging information

A

Communication

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2
Q

Two barriers in human communication

A

Language and Distance

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3
Q

When was the transmission of the first practical electrical signal?

A

1830

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4
Q

When was the telegraph invented?

A

1837

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5
Q

When was telephone invented?

A

1876

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6
Q

Who invented the telegraph?

A

Samuel Morse

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7
Q

Who transmitted the first practical electrical signal?

A

Joseph Henry

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8
Q

What did Samuel Morse invent?

A

Telegraph

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9
Q

Who invented the telephone?

A

Alexander Graham Bell and Thomas A. Watson

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10
Q

What did Alexander Graham Bell and Thomas A. Watson invent?

A

Telephone

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11
Q

When were radio waves discovered?

A

1887

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12
Q

Who discovered radio waves?

A

Heinrich Hertz

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13
Q

Heinrich Herts discovered what?

A

Radio Waves

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14
Q

When was the wireless radio wave propagation demonstrated?

A

1887

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15
Q

Who demonstrated wireless radio wave propagation?

A

Guglielmo Marconi

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16
Q

What did Guglielmo Marconi dis on 1887?

A

Demonstrated the wireless radio wave propagation.

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17
Q

When was the first transatlantic transmission of radio signals?

A

1901

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18
Q

Who accomplished the first transatlantic transmission of radio signals?

A

Guglielmo Marconi

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19
Q

What did Guglielmo Marconi accomplish in 1901?

A

First transatlantic transmission of radio signals.

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20
Q

When was the two-electrode vacuum-tube rectifier invented?

A

1903

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21
Q

Who invented the two-electrode vacuum-tube rectifier?

A

John Fleming

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22
Q

What did John Fleming invent?

A

Two-electrode vacuum-tube rectifier

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23
Q

When was the triode vacuum invented?

A

1906

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24
Q

Who invented the triode vacuum tube?

A

Lee De Forest

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25
Q

What did Lee De Forest invent?

A

Triode Vacuum Tube

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26
Q

When was the television invented and demonstrated?

A

1923

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27
Q

Who invented and demonstrated television?

A

Vladimir Zworykin

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28
Q

What did Vladimir Zworykin invented?

A

Television

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29
Q

When was the transistor invented??

A

1948

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30
Q

Who invented the transistor?

A

William Shockley, Walter Brattain, and John Bardeen

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31
Q

What did William Shockley, Walter Brittain, and John Bardeen invented?

A

Transistor

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32
Q

When was the integrated circuit invented?

A

1959

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33
Q

What happened in 1959?

A

The integrated circuit was invented.

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34
Q

When was the first commercial communications satellite launching?

A

1965

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35
Q

When was the first introduction of cellular telephone in US?

A

1983

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36
Q

What happened in 1965?

A

The first commercial satellite was launched

37
Q

What happened in 1983?

A

The introduction of the cellular telephone in US.

38
Q

Refers to the transmission, reception, and
processing of information using electronic circuits

A

Electronic Communications System

39
Q

What are the basic elements of a communication system?

A

Transmitter, communications channel/medium, and receiver

40
Q

Sources of information may be coming from an ______ source or from a _________ source

A

analog, digital

41
Q

This signal continuously changes with respect to time and with infinite amplitude values

A

Analog signals

42
Q

This signal is something discrete and whose amplitude is of finite value.

A

Digital Signal

43
Q

A collection of electronic devices or circuits designed to convert the information into a signal suitable for transmission over a given communications medium

A

Transmitter

44
Q

Provides the means of transporting signals
between a transmitter and a receiver

A

Communications Channel/Medium

45
Q

It attenuates transmission of information and causes the received signal to appear much lower in amplitude

A

Communications channel or medium

46
Q

A collection of electronic devices or circuits that accept the
transmitted message from the channel and convert them into a form
understandable to humans

A

Receivers

47
Q

What are the two limitation of communication systems?

A

Noise & Bandwidth

48
Q

Any unwanted form of energy that tends to interfere with the
proper and easy reception and reproduction of desired signals.

A

Noise

49
Q

The portion of the electromagnetic spectrum occupied by a signal.

A

Bandwidth

50
Q

The frequency range over which an information signal is
transmitted or over which a receiver or other electronic circuit operates

A

Bandwidth

51
Q

The difference between the upper and the lower
frequency limit
Upper Limit Lower Limit

A

Bandwidth

52
Q

A measure of how much source information can be carried through the system in a given period of time

A

Information Capacity

53
Q

It states that the information capacity is directly proportional to bandwidth and transmission time

A

Hartley’s Law

54
Q

One-way communication is called

A

simplex or broadcasting

55
Q

Two-way communication is called

A

duplex

56
Q

Only one of the parties can transmit at a time

A

half-duplex

57
Q

Both partes may transmit and receive simultaneously

A

full-duplex

58
Q

Examples of simplex

A

AM and FM Radio broadcasting, TV broadcasting, Cable Television, Wireless Remote Control, Paging Services, Navigation and Direction-Finding Services

59
Q

Examples of Half-duplex

A

Two-way Radio, Amateur Radio, Citizens Radio, Radar, Sonar

60
Q

Examples of full-duplex

A

Telephones, Data-Communications, Local Area Networks

61
Q

Transmits and receives simultaneously but not necessarily between the same two locations.

A

Full/full Duplex

62
Q

It is the entire range of usable frequencies

A

Electromagnetic Spectrum

63
Q

Tt is the number of times an alternating current goes through its complete cycle per second

A

Frequency

64
Q

Give 2 application of Extremely Low Frequencies

A

AC power line, end of human hearing range

65
Q

Human hearing range

A

20 to 20000Hz

66
Q

What do you call the normal range of the human voice?

A

Voice Frequencies (300 - 3000 Hz)

67
Q

Very Low Frequencies application

A

Higher end of the human hearing range, musical instruments

68
Q

Low Frequencies application

A

Aeronautical and marine navigation

69
Q

Medium Frequencies Application

A

AM Radio Broadcasting, Marine and Aeronautical Communications

70
Q

AM Radio Frequency Range

A

535 - 1605 kHz

71
Q

Generally known as short waves

A

High Frequencies

72
Q

High Frequencies Application

A

All kinds of two-way radio communication

73
Q

Very High Frequencies Application

A

Mobile Radio, Marine and Aeronautical communications, FM radio broadcasting, and television channels 2-13

74
Q

FM Radio Broadcasting Frequency range

A

88 - 108 MHz

75
Q

Ultra High Frequencies Application

A

Television channels 14-83, land mobile communications, cellular telephones

76
Q

Super High Frequencies Applications

A

Satellite and Radar Communications

77
Q

Extremely High Frequencies Application

A

Satellite communications and some specialized radar

78
Q

Infrared Applications

A

Detect stars, remote control units, guidance of weapon systems, and optical devices.

79
Q

Visible Spectrum Applications

A

Communication Systems, fiber optics, and laser technology.

80
Q

The length that one cycle of an electromagnetic wave occupies in space

A

Wavelength

81
Q

What is the formula for wavelength

A

k(c/f)

82
Q

Very short wavelengths are usually expressed as

A

Angstrom (1/10000) um

83
Q

Equipment that represents the signal in the frequency domain is the

A

Spectrum Analyzer

84
Q

A complete communication system should include

A

A transmitter, a receiver, and a channel

85
Q

The bandwidth required for a modulated carrier depends on

A

the baseband frequency range

86
Q

The baseband bandwidth for a voice-grade (telephone) signal is

A

approximately 3 kHz

87
Q

A simultaneous two-way communication

A

full duplex

88
Q

Recovering the originally transmitted signal is called

A

demodulation

89
Q

Microwaves start at

A

Ultra High Frequencies

Communications 1 (7 decks)

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