How a two way radio system works

Basically, a radio communication system consists of a transmitter, a channel, and a receiver.

• In a transmitter,

The input sound signal is converted into equivalent electrical current / voltage by a transducer The transducer output is amplified by a chain of amplifiers (so that it can travel longer distance) The purpose of the transmit antenna is to efficiently transform the electrical signal into radiation energy

• In a receiver,

The receive antenna efficiently accepts the radiated energy and convert it to an electrical signal As the signal suffered attenuation during travel it requires further amplification The output transducer converts the electrical signal back into sound energy

A B

• Simplex – A can talk to B

Radio, T.V. broadcasting, CD/DVD ROM Simplest type, requires one transmitter and one receiver Types of Communication

• Duplex – A and B both can talk to each other simultaneously

Telephone, Telegraph, Complex, requires two transmitter and two receiver at both ends Needs two different channels for simultaneous transmission

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