Amateur radio is the licensed and private use of designated radio bands, for purposes of private recreation, non-commercial exchange of messages, experimentation, self-training, and emergency communication. Amateur radio, like other regulated radio services, operates under rules that limit the maximum power and the technical and operational characteristics of transmissions. Amateur radio stations are issued with a designated call sign to allow identification of stations. The power of amateur radio equipment is restricted, and operators must not cause interference to other authorized radio users. They may not broadcast to or communicate with the public with their equipment. They are only allowed to communicate with other licensed operators. National regulations governing amateur radio use are coordinated under international agreements since radio frequency transmissions can cross multiple national boundaries.
Amateur radio is also called ham radio in certain countries. It is a hobby and self-training. The term "amateur" is used to differentiate it from commercial and professional two-way radio services. Amateur radio operation in the United States is licensed by the Federal Communications Commission. In the United Kingdom by Ofcom. All countries are coordinated through the International Telecommunication Union. An estimated two million people throughout the world are regularly involved with amateur radio. (Wikipedia)
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