Many amateur wire telegraphers started experimenting with wireless communications. The word is based on the verb to radiate. The word became popular in the s in the United States. By , there were many instances of harmful interference by unlicensed experimenters with governmental and commercial operations.
Amateur Radio - Engineering and Technology History Wiki
Forgot Password? In , James Clerk Maxwell presented his theory of the electromagnetic field. In Guglielmo Marconi communicated across the Atlantic with a radio device using high power and giant antennas. To curb interference, Congress approved the Radio Act of , which required amateurs to be licensed and restricted to the single wavelength of meters.
Ham Radio History
Amateur radio , also known as ham radio , is the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport , contesting , 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 interest;"  either direct monetary or other similar reward and to differentiate it from commercial broadcasting , public safety such as police and fire , or professional two-way radio services such as maritime, aviation, taxis, etc. The amateur radio service amateur service and amateur-satellite service is established by the International Telecommunication Union ITU through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual stations licenses with an identifying call sign. Prospective amateur operators are tested for their understanding of key concepts in electronics and the host government's radio regulations.
In California, volunteers save lives as part of their involvement in an emergency communications network. And at the scene of a traffic accident on a Chicago freeway, a ham calls for help by using a pocket-sized hand-held radio. This unique mix of fun, public service, and convenience is the distinguishing characteristic of amateur radio. Some hams are attracted to the idea of communicating across the country, around the globe, and even with astronauts on space missions. Others enjoy building and experimenting with electronics.