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communications system

In , a communication system is a collection of individual communications networks, transmission systems, stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole. The components of a communications system serve a common purpose, are technically compatible, use common procedures, respond to controls, and operate in union. is a method of communication (e.g., for sports , , journalism, etc.). Communication is the act of conveying intended meanings from one entity or group to another through the use of mutually understood signs and semiotic rules Media: An system is any form of telecommunication that uses light as the . Equipment consists of a , which encodes a message into an optical , a communication channel, which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal. Fiber-optic communication systems transmit information from one place to another by sending light through an . The light forms a carrier signal that is modulated to carry information. A communication system is composed of several communications subsystems that give exterior communications capabilities. A radio communication system comprises a transmitting conductor in which electrical oscillations or currents are produced and which is arranged to cause such currents or oscillations to be propagated through the free space medium from one point to another remote there from and a receiving conductor at such distant point adapted to be excited by the oscillations or currents propagated from the transmitter. By technology:- A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. The term duplex is used when describing communication between two parties or devices. Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way street" between two connected parties or to provide a "reverse path" for the monitoring and remote adjustment of equipment in the field. An is basically a small length of a qwert conductor that is used to radiate or receive electromagnetic waves. It acts as a conversion device. At the transmitting end it converts high current into electromagnetic waves. At the receiving end it transforms electromagnetic waves into electrical that is fed into the input of the receiver. several types of antenna are used in communication. Examples of communications subsystems include the Defense Communications System (DCS). Examples: By technology

 Mobile  Telegraph  Edison Telegraph  T.V. Cable  By application area:- A tactical communications system is a communications system that (a) is used within, or in direct support of tactical forces (b) is designed to meet the requirements of changing tactical situations and varying environmental conditions, (c) provides securable communications, such as voice, data, and , among mobile users to facilitate command and control within, and in support of, tactical forces, and (d) usually requires extremely short installation times, usually on the order of hours, in order to meet the requirements of frequent relocation.

Transmitter. In and telecommunications a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna. The transmitter itself generates a , which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves.devices that communicate by radio, such as radio and broadcasting stations, cell phones, walkie-talkies, computer networks, enabled devices, garage door openers, two-way in aircraft, ships, , sets and navigational . The term transmitter is usually limited to equipment that generates radio waves for communication purposes; or , such as radar and navigational . Generators of radio waves for heating or industrial purposes, such as ovens or diathermy equipment, are not usually called transmitters, even though they often have similar circuits. The term is popularly used more specifically to refer to a , a transmitter used in broadcasting, as in FM radio transmitter or television transmitter. This usage typically includes both the transmitter proper, the antenna, and often the building it is housed in.

Receiver:- In radio communications, a , also known as a receiver, wireless or simply radio is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves (electromagnetic waves) and converts them to tiny alternating currents which are applied to the receiver, and the receiver extracts the desired information. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic to increase the power of the signal for further processing, and finally recovers the desired information through . Radio receivers are essential components of all systems that use radio. The information produced by the receiver may be in the form of , moving images (television), or . A radio receiver may be a separate piece of electronic equipment, or an within another device. The most familiar type of radio receiver for most people is a broadcast radio receiver, which reproduces sound transmitted by stations, historically the first mass-market radio application. A broadcast receiver is commonly called a "radio". However radio receivers are very widely used in other areas of modern technology, in , cell phones, wireless and other components of communications, , and wireless networking systems.