Radio equipment: As defined in Federal Information Management Regulations, any equipment or interconnected system or subsystem of equipment (both transmission and reception) that is used to communicate over a distance by modulating and radiating electromagnetic waves in space without artificial guide. This does not include such items as microwave, satellite, or cellular telephone equipment.
Radio frequency jammers - also known as RF jammers, bomb jammers, radio jammers, and other radio frequency jammer devices - are designed to prevent other communication devices from successfully operating.
Radio jamming is often used to prevent the use of RF devices in a specific area.
The actual range of a radio jamer depends on its power and the local environment, which may include hills or walls of a building that block the radio frequency jamming signal.
At the conference, the familiar amateur radio bands of 80, 40, 20 and 10 meters were established by treaty and international radio callsign prefixes were devised.
Amateur radio operators who are involved in emergency communications often belong to a national emergency club or organization, such as ARES and RACES in the United States, AREC in New Zealand, RAYNET in the United Kingdom, WICEN in Australia and Hamnet in South Africa.
In contrast to most commercial and personal radio services, most radio amateurs are not restricted to using type-approved equipment, and therefore some radio amateurs home-construct or modify equipment in any way so long as they meet national and international standards on spurious emissions.
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