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INTRODUCTION TO ELECTRONIC
COMMUNICATIONS
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ELECTRONICS
Computers largest field in terms of sales of
equipment and services and number of employees
Computer Industry concerned with the
development and servicing of computer hardware
and software used by businesses, industry and
government for the processing, storage andretrieval of data.
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ELECTRONICS
Communications
second largest in size
Communications Industry
concerned with electronic equipment
used for transfer ofinformation between
two or more points.
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ELECTRONICS
Control
smallest field
Control Field
concerned with electric power as wellas various kinds of electronic
components and circuits used to operatelights, heating elements, electric motorsand other devices.
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ELECTRONICS
Communications
- components
- circuits- techniques
- applications
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COMMUNICATION
Communication
basic process of exchanginginformation
transferring of information from oneplace to another
Human
convey their thoughts, ideas andfeelings to one another
- spoken words / non-verbal / letters
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COMMUNICATION
Barriers of Human Communications
1. Language
2. Distance
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ELECTRONIC COMMUNICATIONS
Electronic Communication
transmission, reception and
processing ofinformation
between twoor more locations using electronic
circuits.
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ELECTRONIC COMMUNICATIONS
History
Late 19th century electricity was discovered
1837 1844 FirstE
lectronic CommunicationsSystem
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ELECTRONIC COMMUNICATIONS
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ELECTRONIC COMMUNICATIONS
1866 First Successful use of a Transatlantic
Telegraph Cable
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ELECTRONIC COMMUNICATIONS
1876 Telephone
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ELECTRONIC COMMUNICATIONS
1887 Hertz discovers Radio Waves
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ELECTRONIC COMMUNICATIONS
1894 95 Wireless Telegraphy
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ELECTRONIC COMMUNICATIONS
1901 First Transatlantic Radio Transmission
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ELECTRONIC COMMUNICATIONS
1903 Fleming Valve was invented
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ELECTRONIC COMMUNICATIONS
1906 08 Triode Vacuum Tube / First Radio
Telephone Broadcast
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ELECTRONIC COMMUNICATIONS
1920 First Commercial Radio (AM)
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ELECTRONIC COMMUNICATIONS
1923 Television was invented
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ELECTRONIC COMMUNICATIONS
1931 Radio Astronomy
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ELECTRONIC COMMUNICATIONS
1933 FM
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ELECTRONIC COMMUNICATIONS
1936 First FM Commercial Broadcasting
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ELECTRONIC COMMUNICATIONS
1940-45 RADAR was perfected
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ELECTRONIC COMMUNICATIONS
1948 Transistor was invented
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ELECTRONIC COMMUNICATIONS
1954 Colored Television
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ELECTRONIC COMMUNICATIONS
1959 - Integrated Circuits
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ELECTRONIC COMMUNICATIONS
1962 First Commercial Satellite
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ELECTRONIC COMMUNICATIONS
Modern Electronic Communications System
1. metallic cable systems
2. microwave and satellite radio systems
3. optical fiber systems
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ELECTRONIC COMMUNICATIONS
Elements of a Communication System
TransmitterCommunication
Channel or
Medium
Receiver
Noise
Message for
Human
Application
Human
Message
Input
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ELECTRONIC COMMUNICATIONS
Transmitter
collection of electronic components
and circuits designed to convert the
information into a signal suitable for
transmission over a given
communications medium
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ELECTRONIC COMMUNICATIONS
Communication Channel
medium by which the electric signal is
sent from one place to another
Radio
general term applied to any form of
wireless communications
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ELECTRONIC COMMUNICATIONS
Receiver
electronic components and circuits that
accept the transmitted message from the
channel and convert it back into a form
understandable by humans
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ELECTRONIC COMMUNICATIONS
Noise
random, undesirable electric energy
that enters the communication system
via the communication medium and
interferes with the transmitted message.
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ELECTRONIC COMMUNICATIONS
Types ofElectronic Communications
A. One Way or Two Way
B. Types of Intelligence Signals TransmittedC. Baseband or Modulated Signals
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ELECTRONIC COMMUNICATIONS
One Way or Two Way Transmission
1. Simplex one way communicationcommunications
2. Half Duplex one party transmits at a time
3. Full Duplex can transmit and receivesimultaneously
4. Full Full Duplex possible to transmit andreceive simultaneously, but not necessarilybetween the same two locations.
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ELECTRONIC COMMUNICATIONS
Types of Intelligence Signals Transmitted
1. Analog Signal a continuously varying
voltage or current
2. Digital Signal digital codes / data
Digital Communications
1. Digital Transmission2. Digital Radio
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ELECTRONIC COMMUNICATIONS
Baseband or Modulated Signals
Baseband Transmission putting the original
voice, video, or digital signals directly into the
medium.
Modulation process of having a baseband
voice, video, or digital signal modify another
higher frequency signal.