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Amateur radio, also known as ham radio, is the use of
radio frequency Radio frequency (RF) is the oscillation Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. The term '' vibration'' is prec ...
spectrum A spectrum (plural ''spectra'' or ''spectrums'') is a condition that is not limited to a specific set of values but can vary, without gaps, across a Continuum (theory), continuum. The word was first used scientifically in optics to describe the ...
for purposes of
non-commercial A non-commercial (also spelled noncommercial) activity is an activity that does not, in some sense, involve commerce Commerce is the exchange of goods and services, especially on a large scale. Etymology The English-language word ''commerce'' ...
exchange of messages,
wireless Wireless communication (or just wireless, when the context allows) is the transfer of information between two or more points that do not use an electrical conductor In physics Physics (from grc, φυσική (ἐπιστήμη), ph ...

wireless
experimentation, self-training, private recreation,
radiosport 2002 was held in Helsinki, Finland. Radiosport (or radio sport) is formal competition among amateur radio operators in any of three amateur radio activities. The Friendship Radiosport Games is an international multi-sport event that includes all t ...
,
contesting Contesting (also known as '' radiosport'') is a competitive activity pursued by amateur radio operators. In a contest, an amateur radio station, which may be operated by an individual or a team, seeks to contact as many other amateur radio stati ...
, and emergency communication. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without
pecuniary {{Short pages monitor * {{DEFAULTSORT:Amateur Radio Amateur radio, History of radio Radiocommunication services ITU