Ever since radio transmissions first began there were experimenters and tinkerers'. Indeed even today a great many of the advances in radio science continue to come from this band of people.
Most are now called Amateur Radio Operators and to prevent total chaos each would-be operator sits for modest examinations set by the laws of his or her region to gain a license.
You will find amateurs are courteous, helpful, constructive (in more ways than one) and always have a warm welcome for newcomers. If you need help just politely ask.
Amateur Operators have assigned bands and modes of operation. They also observe certain standards of etiquette and ethics. Amateurs play a significant role in providing communication links when needed, particularly in times of natural disaster. It is a wonderful fraternity which over-rides the boundaries of nationality, politics and religion.
Virtually every country in the world has an umbrella amateur radio organization. In the U.S.A. it is the American Amateur Radio League (A.R.R.L.), Great Britain has the Radio Society of Great Britain (R.S.G.B.) and Australia has the Wireless Institute of Australia (W.I.A.).
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