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INTRODUCTION TO
ELECTRONICS
COMMUNICATION
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1800 James Clerk Maxwell a Brtish Physicist, indicate that electricity and light both travel inform of
electromagnetic waves
1888 einrich ert! "erman scientist who able to radiate electromagnetic energy
from a machine called oscillator
18#$ %& Branley develo'ed the (rst detector
18#) *s Po'o+, -ssian ex'erimenter, recorded radio waves emanating fromlightning
18). /am-el Morse develo'ed telegra'h, the 1st electronic comm-nications system-sing
electromagnetic ind-ction
18. *lexander "raham Bell s-ccessf-lly transmitted h-man conversation over af-nctional
2homas 3atson tele'hone system
18#4 "-glielmo Marconi 5talian /cientist, acoom'lished the 1st wireless electroniccomm-nications
18# Marconi transmitting radio signal -' to $ miles from shi' to shore
18## Marconi sent the 1st wireless message across the english channel
1#0$ 2he (st transatlantic signal were sent from Pold-, %ngland, tonewfo-ndland
1#08 6ee 7eforest invented the triode vac--m t-be which allowed for the 1st 'ractical
am'li(cation of electronic signal
1#$0 eg-lar *M radio broadcast began
1#)) Ma %dward *rmstrong invented 9M
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Let us test what you learn!Let us test what you learn!
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Who invented the telephone?Who invented the telephone?
*& einrich ert!*& einrich ert!
B& /am-el MorseB& /am-el Morse
C& *lexander "raham BellC& *lexander "raham Bell 7& 6ee 7eforest7& 6ee 7eforest
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Comm-nication:;5t is the 'rocess of re'resenting,
transferring, inter'reting or
'rocessing information among'ersons, 'laces or machines& 5tim'lies a sender, a receiver and a
transmission medi-m over which theinformation travels
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%lectronicComm-nication /ystem:;5t is concerned with the sorting,
'rocessing and storing of informationbefore its transmission -singelectronic e
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Let us test what you learn!Let us test what you learn!
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In Ideal situation, Noise ExistIn Ideal situation, Noise Exist
*& 2r-e*& 2r-e
B& 9alseB& 9alse
C& PossibleC& Possible 7& 3ho cares=7& 3ho cares=
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Baseband signal:;5t is the original signal information witho-t f-rther 'rocessing and mod-lating M>lti'lexing:; 5s the 'rocess of allowing two or more signals to share the same medi-m of channel Mod-lation
:; 5t is the 'rocess by which some characteristic of the carrier signal varies inaccordance with the baseband signal 9re
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Mode of Electronic Communication Transmission
SIMPLEX
a& *m'lit-de Mod-lation adiob& 9re
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7-'lex
:;alf 7-'lex
a& 2wo way radio
b& adio detection and rangingc& /o-nd navigation and anging
d& *mate-r adio
e& Citi!en band radio
:;9-ll 7-'lex
2ele'hones
:; 9-ll:9-ll 7-'lex
a& 6ocal *rea network
b& 7ata Comm-nication
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Band A-mber 9re
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FIRST LETTER
A >n:mod-lated Carrier
* 7o-ble /ideband 9-ll Carrier
B 5nde'endent /ideband 9-ll Carrier
C estigial /ideband 9-ll Carrier
/ingle /ideband 9-ll Carrier
J /ingle /ideband /-''ressed Carrier
/ingle /ideband ed-ced Carrier
9 9re