Amateur frequency

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Ever watch the Stranger Things series on Netflix? It also features some excellent electronics technology that was at its prime back in the 80s and is still kicking today. In one scene, three boys are sitting around their very first ham radio with their science teacher in tow. For Dustin, Mike, and Lucas, ham radio was like a gateway into an invisible dimension, and an alien one, allowing them to connect wirelessly with some simple electronic components.
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Frequency Allocations

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HF Ham Radio Bands: HF Frequencies » Electronics Notes

Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the International Telecommunication Union ITU oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges; authorized bands may vary by the class of the station license. Radio amateurs use a variety of transmission modes, including Morse code , radioteletype , data, and voice. Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. The modes and types of allocations within each frequency band is called a bandplan ; it may be determined by regulation, but most typically is set by agreements between amateur radio operators.
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Amateur radio frequency allocations

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;" [1] 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 station licenses with a unique identifying call sign , which must be used in all transmissions. Amateur operators must hold an amateur radio license which is obtained by passing a government test demonstrating adequate technical radio knowledge and legal knowledge of the host government's radio regulations.
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These ham radio bands or frequency allocations are open to radio hams around the world to use although the actual ham radio allocations do vary slightly from country to country and region to region. However a broad view of the ham radio band allocations can be given, and this is accompanied below with an overview of the properties of the different allocations for radio amateurs. In the HF portion of the radio spectrum, there is a total of nine different bands that are allocated to ham radio around the globe. These bands are generally the same world-wide although there are some variations dependent upon the country or region dependent upon the actual amateur radio band in question. A summary of the different bands is given below.
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