Telecommunication

Introduction:

The Modern business, fast exchange of information and ideas, rapid contacts, radio, and TV programs all depend on telecommunication.It refers to the transfer of information and messages by electromagnetic means. Electromagnetic means are radio waves, also known as wire. The word "Electromagnetic" is the combination of electric and magnet which were earlier considered separate things. However, Maxwell later, discovered that both are different sign of the same things. According to him, magnetism is the result of relative motion of electric field.

Telecommunication includes telegraphy (telegram), radio, TV, Telephones, satellite receivers etc. The telecommunication system is made of a transmitter, a receiver, and a transmission channel (a medium).

Transmitter:

The transmitter sends the encoded message through a modulator. A modulator is a device which carries the message in the form of signals on an electromagnetic wave or an electric current.

Transmission Channel:

It is a wire, optical fiber, or radio waves, The waves work within a specified frequency range known as bandwidth. A single channel has the capability to send many signals at a time provided a multiplex is used. A multiplex is a device which combines many signals and used in all telecommunications.

Receiver:

It decodes the signals into desired form of message as sound, printout of the computer or teleprinter, or an electric signal to a computer. The receiver may have a noise or distortion if the signal takes two different routes instead of one desired.