Articles

Overview Of Communication Systems

by Melriya Techsolutions MELRIYA Technical Solutions
Communication equipment are made up of devices that employ one of two communication methods(wireless or wired), different types of equipment (portable radios, mobile radios, base/fixed station radios, and repeaters), and various accessories (examples include speaker microphones, battery eliminators, and carrying cases) and/or enhancements (encryption, digital communications, security measures, and interoperability/networking) to meet the user needs.

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This section provides the reader with information on the system technologies and the system
enhancements. 

Types of Equipment

The Fire panel pcb board communication equipment considered in this guide includes portable radios, mobile radios, base/fixed station radios, repeaters, and base station/repeaters. Each type of equipment will be discussed in the following sections.

Portable Radios

Portable radios are small, lightweight, handheld, wireless communication units that contain both a transmitter and a receiver, a self-contained microphone and speaker, an attached power supply (typically, a rechargeable battery), and an antenna. Portable transceivers (such as a walkie-talkie) have relatively low-powered transmitters (1 W to 5 W), need to have their batteries periodically recharged or replaced, and may be combined in a wireless radio communication system with other portable, mobile, and base station radios. There are also very low-powered transceivers, available with power outputs of 0.1 W, which are generally linked to portable repeaters for extended range and interoperability with higher-powered radio systems.

Mobile Radios

Mobile radios are larger than portable radios and are designed to be mounted in a fixed location inside a vehicle (police cruiser, fire truck, etc.). Like portable radios, mobile radios contain both a transmitter and a receiver and may contain an internal speaker. However, mobile radios connect to the vehicle’s power supply, which enables them to have a higher transmitter output power (typically 5 W to 50 W) and an external antenna. The microphone is usually handheld, and the speaker may be externally located to the radio. Because of the higher transmitter power and external antenna, the effective communication range is greater than that of a portable radio,
especially if a repeater is not used. The receivers in mobile radios are generally more sensitive than the receivers found in portable radios, as physical space for components in mobile radios is not as critical as in portable radios. Personnel who do not need to communicate with others when away from the vehicle typically use mobile radios. As with portable radios, mobile radios may be combined into a radio communication system with other portable, mobile, and base station radios.

Base/Fixed Station Radios

A base (or fixed) station radio also contains a transmitter and a receiver. The radio is powered by an external electrical system (typically 110 V ac) and is connected to an antenna located tens to hundreds of feet away, typically on top of a building or on a tower. Because the base station radio uses an external electrical system (i.e., commercial power mains), compared with portable and mobile radios, they have the most powerful transmitters (5 W to hundreds of watts) and the most sensitive receivers. Microphones can either be handheld or desktop models, and the
speaker can either be external or internal to the radio.

Communications security is becoming increasingly important. Presently, the general public can purchase any one of several different radio receivers that will allow them to monitor virtually all public safety communications.

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About Melriya Techsolutions Advanced   MELRIYA Technical Solutions

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Created on Mar 25th 2021 04:44. Viewed 543 times.

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