Answer:
The three basic units of communication system are :
( 1 ) Transmitter :
A transmitter processes the incoming message signal so as to make it suitable for transmission through a channel and subsequent reception.
( 2 ) Receiver :
A receiver extracts the desired message signals at the channel output.
( 3 ) Channel :
It is the medium through which the electrical signals from transmitter pass to reach the receiver. It is either space or conductors or optical fibers.
Explanation:
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