A story that has been on the burner for a few weeks concerns a proposal that will be advanced to the ITU World Radiocommunication Conference It originates with French spectrum regulators and is reported to be at the behest of the Paris-based multinational defence contractor Thales. The sting in its tail is the proposed relegation of amateur radio to secondary status of the widely used two-meter band MHz to permit its usage by aircraft. The machinations of global spectrum regulation politics do not often provide stories for Hackaday readers, but this one should be of concern beyond the narrow bounds of amateur radio. Most parts of the radio spectrum are shared between more than one user, and there is usually a primary occupant and a secondary one whose usage is dependent upon not interfering with other users. While some countries have wider band limits, the two-meter band between MHz and MHz is allocated with primary status to radio amateurs worldwide, and it is this status that is placed under threat.
The Backbone Of VHF Amateur Radio May Be Under Threat
Amplitude Modulation in Ham Radio | Electronics Notes
Fulfillment by Amazon FBA is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community. Please make sure that you are posting in the form of a question. Please enter a question.
Although it is nowhere near as efficient as other forms of modulation, it can very occasionally be heard on the amateur radio bands today. In amateur radio circles the abbreviation, AM, is sometimes jokingly used to stand for Ancient Mode. The concept behind amplitude modulation is very straightforward, the audio or other modulating signal is used to vary the amplitude of the carrier or RF signal. The main drawback of amplitude modulation is the very low efficiency.
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.