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MOBILE RADIOPRESENTED BY:M.SAMATHA -11291A0562S.SUCHARITHA -11291A0594UNDER GUIDANCE OF:VENUGOPAL

CONTENTS 1.INTRODUCTION 2.HISTORY 3.WORKING 4.USES 5.APPLICATIONS

INTRODUCTION Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies. where the path of communications is movable on either end. Some mobile radios are mounted in aircraft, (aeronautical mobile), shipboard, (maritime mobile), on motorcycles, or railroad locomotives. Power may vary with each platform.

For example, a mobile radio installed in a locomotive would run off of 72- or 30-volt DC power. A large ship with 117V AC power might have a base station mounted on the ship's bridge.

HISTORY Early users of mobile radio equipment included transportation and government. These systems used one-way broadcasting instead of two-way conversations.One of the major challenges in early mobile radio technology was that of converting the six or twelve volt power supply of the vehicle to the high voltage needed to operate the vacuum tubes in the radio.

WORKING Most mobile radios operate on a single band of frequency. The radio transceiver contains transmit and receive frequencies. Very high frequency (VHF) and ultra high frequency (UHF) allow a mobile radio to operate on maximum coverage. This means that its average operating range is from 150 to 470 MHz.

USES The use of mobile radio in transportation, security, and general operations makes communication fast, efficient and safe.Additionally, the range of its area coverage is very high and is not dependent on a cellular network

Different types of mobile radio are portable and capable of withstanding shock and severe weather conditions. This helps ensure that the communication gadget functions according to standards and that its use does not interfere with other communication systems.

APPLICATIONS1.Multiple controls, microphones

A mobile radio in a US ambulance often has two sets of controls: one in the patient area and another near the driver. US ambulances often have radios with dual controls and dual microphones allowing the radio to be used from the patient care area in the rear or from the vehicle's cab.

2.Data radio A data terminal radio allows data communications to take place over the separate radio. Early Federal Express (FedEx) radio systems used a single radio for data and voice. The radio had a request-to-speak button which, when acknowledged, allowed voice communication to the dispatch center. Since a mobile radio typically works on a single frequency band, multiple radios may be required in cases where communications take place over systems on more than one frequency band.

3.Walkie Talkie Intended as a cost savings, some systems employ vehicular chargers instead of a mobile radio. Each radio user is issued a walkie talkie. Each vehicle is equipped with a charger system console

PROFESSIONAL MOBILE RADIOProfessional Mobile Radio (also known as Private Mobile Radio (PMR) in the UK and Land Mobile Radio (LMR) in North America) are field radio communications systems which use portable, mobile, base station, and dispatch console radios.

CONCLUSIONThis term paper reveals all the aspects of mobile radio.Mobile radio has evolved a lot but it is an ever growing field and has its technology being advanced in near future. It is ever growing in private sector and giving room to an blooming industry. Hence, in near future, it will increase to ever lasting heights