| There are many different services offered in | | | | after highway accidents. |
| two way radio communications. Each service | | | | |
| has its own purpose. Among the basic two way | | | | In the ultra high frequency band a particular |
| communication services are Citizens band | | | | range of frequency has been authorized for |
| radio operators, Amateur radio, Aeronautical | | | | citizens band voice and control signals. |
| radio and the general mobile radio service. | | | | |
| In the private land mobile radio services | | | | Individual operators of citizens band |
| public safety radio, special emergency radio | | | | equipment need not be licensed but the |
| and industrial radio are included. The | | | | transmitting equipment is licensed through |
| citizens band radio operates at specific | | | | the manufactures authorization. |
| Megahertz, amplitude modulated or single | | | | |
| sideband using shared assigned channels. The | | | | The citizens band operation requires the |
| Citizens radio service more commonly called | | | | transmitter and the receiver\ to be on the |
| citizens band is a public non commercial | | | | same channel and operators generally use a |
| radio service available to the general | | | | code. This code with some modifications is |
| population. | | | | also used by police and fire departments. |
| | | | |
| There are four classes of citizens band radio | | | | Amateur radio operator is a duly person |
| viz. Class A to Class D stations | | | | interested in radio techniques with a |
| respectively. | | | | personal aim and without financial interest. |
| | | | There are thousands of these operators in the |
| Citizens band offers a convenient | | | | world. These operators converse over |
| communication system that can be used at | | | | distances limited only by the size of the |
| home, in a car, in a boat, or on an airplane, | | | | earth and by the power of their stations. |
| or even while walking or hiking. Specific | | | | |
| ranges of frequencies are used for radio | | | | The aeronautical Broadcasting Service |
| control of aircraft, model boats and garage | | | | disseminates information for the purpose of |
| door openers. A particular channel is set | | | | air navigation and communication. |
| aside for emergency communications, such as | | | | |