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The ITU Radio Regulations (RR) is a basic document of the International Telecommunication Union (ITU) that regulates on law of nations scale radiocommunication services and the utilisation of radio frequencies.
The International Telecommunication Union (ITU) is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies. ITU Radio Regulations are the set of ITU's regulations governing electromagnetic spectrum from 9 kHz to 275 GHz.
The International Telecommunication Union (ITU), in its International Radio Regulations, divides the world into three ITU regions for the purposes of managing the global radio spectrum. Each region has its own set of frequency allocations , the main reason for defining the regions.
The conference was attended by representatives of 29 nations and culminated in the International Radiotelegraph Convention. An annex to the convention eventually became known as ITU Radio Regulations. At the conference it was also decided that the Bureau of the International Telegraph Union would also act as the conference's central administrator.
Standard frequency and time signal service (short: SFTS) is, according to Article 1.53 of the International Telecommunication Union's (ITU) Radio Regulations (RR), [1] "A radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of stated high precision, intended for general reception".
These ITU radio bands are defined in the ITU Radio Regulations. Article 2, provision No. 2.1 states that "the radio spectrum shall be subdivided into nine frequency bands, which shall be designated by progressive whole numbers in accordance with the following table". [13]
the Administrative Regulations. The provisions of the Constitution and the Convention are further complemented by those of the Administrative Regulations. This Administrative Regulations comprise the ITU International Telecommunication Regulations (ITR), and; ITU Radio Regulations (RR) and are binding on all ITU member states as well.
In ITU Radio Regulations, the range 275 – 3,000 GHz whilst not formally allocated, is subject to footnote 5.565; this was last revised by WRC-12 and the current version is below: 5.565 The following frequency bands in the range 275-1,000 GHz are identified for use by administrations for passive service applications: Radio astronomy service: