2ND SEM (2ND YR) > Comms 3 > Flashcards

Comms 3 Flashcards

(47 cards)

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1
Q

Elements of communicaton

A
  • Sender
  • Receiver
  • Message
  • Medium
  • Feedback
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2
Q
  • the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light,
A

Basic radio communication

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3
Q
  • He solidify the observation of Hans Christian Oersted (electric field and magnetic field) and Andre Marie Ampere on the association of electric and magnetic.
A

James Clerk Maxwell

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4
Q

When did Maxwell demonstrated subtle connection between electric and magnetic field

A

1864

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5
Q

Maxwell solidify the observation of these two

A
  • Hans Christian Oersted
  • Andre Marie Ampere
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6
Q
  • He supported Michael Faraday’s “a changing magnetic field produces an electric field”
A

Maxwell

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7
Q

A changing magnetic field produces

A

Electric field and vice versa

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8
Q

Maxwell incorporated ___ and ___ electromagnetism

A
  • Light
  • Wave
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9
Q
  • The forerunner of the various carbon microphones that were used in most telephones produced in the 20th century.
A

David Edward Hughes

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10
Q

When did David Edward Hughes performed a series of experiments in which his equipment transmitted wireless signals

A

1879 - 1886

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11
Q

Hughes performed a series of experiments in which his equipment transmitted wireless signals up to

A

500 yards

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12
Q

he produced electromagnetic waves in the laboratory and their susceptibility to rasured their length and velocity.

A

Heinrich Rudolf Hertz

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13
Q

When did Heinrich Rudolf Hertz produced electromagnetic waves in the laboratory and their susceptibility to rasured their length and velocity.

A

1885 - 1889

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14
Q
  • He showed that the nature of their vibration and reflection and refraction were the same as those of light and heat waves.
A

Heinrich Rudolf Hertz

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15
Q
  • He experimentally demonstrated the transmission and radiation of radio frequency energy
A

Nikola Tesla

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16
Q

When did Tesla demonstrated the transmission and radiation of radio frequency energy

A

1802

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17
Q

He was also credited win being the first person to patent radio technology and when

A

Nikola Tesla (1943)

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18
Q

He proved the feasibility of radio communication

A

Guglielmo Marconi

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19
Q

he flashed the first wireless signal across the English Channel

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A

Guglielmo Marconi

20
Q

When did Guglielmo Marconi flashed the first wireless signal

21
Q

What letter was flashed by Guglielmo Marconi and where

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A

Letter “S” from England to Newfoundland

22
Q
  • It generates data or message to be transferred.
23
Q
  • Converts non-electrical signal into electrical form.
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A

Input transducer

24
Q
  • used to send out data as radio waves in a specific band of the electromagnetic spectrum
25
Function of transmitter
- Amplify - Modulated
26
- The medium of propagation of the electrical signal data/message signal
Channel
27
- used to receive data as radio waves in a specific band of the electromagnetic spectrum
Receiver
28
Function of receiver
- amplify - demodulate
29
- Takes electrical signals and converts them into other forms of energy
Output Transducer
30
- information receiver
Destination
31
Basic mode of communication
- broadcasting - p2p communication
32
- defined as a disturbance which moves through a medium
Waves
33
- The height of the wave usually measured in metres
Amplitude
34
Highest part of the wave
Crest
35
Lowest part of the wave
Trough
36
- The distance between two consecutive wave crests or between two consecutive wave troughs.
Wavelength
37
- The number of waves passing a fixed point in a specified period of time.
Frequency
38
Types of signal
- analog - digital
39
This type of signal is continuous variation of current and voltage
Analog
40
This type of signal is discrete stepwise
Digital
41
- device that converts one form of energy into another
Transducer
42
- Loss of quality and strength of the signal while traveling through a medium.
Attenuation
43
- Increasing the amplitude of a signal using an electrical circuit
Amplification
44
- Superimposing low-frequency information on a high-frequency carrier wave to overcomes heavy attenuation of low-frequency signals.
Modulation
45
- Extraction of the original information from the modulated signal at the receiver.
Demodulation
46
- Frequency range over which the signal is transmitted or equpment operates
Bandwidth
47
- A device that picks up, amplifies, and re-transmits signals.
Repeater
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