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Chapter 5. Radio Wave > Available Radio Frequency Spectra

5.1. Available Radio Frequency Spectra

The use of radio frequency is generally regulated by federal or international authorities. In the United States, the usage of radio frequency is regulated by the Wireless Telecommunications Bureau [1] under the Federal Communications Commission. Specifically, radio frequency domestic and international usages have been defined in detail by Part 2 (Frequency Allocations and Radio Treaty Matters: General Rules and Regulations) of the FCC rules and regulations, which is labeled as Code of Federal Regulation title 47. In Part 2 of title 47, the available radio frequency is divided into nine bands as shown in Table 5.1.

Detailed frequency allocation is available in a tabular format for frequencies from 9 kHz to 400 GHz. Table 5.1 has frequency usage allocations for the United States as well as international regions. To facilitate the international allocating of the radio spectrum, the International Telecommunication Union (ITU) has divided the world into three regions as shown in Figure 5.1. Region 1 includes the area limited on the east by line A and on the west by line B. Region 2 includes the area limited on the east by line B and the west by line C. Region 3 includes the area limited on the east by line C and on the west by line A. The United States reside in region 2.


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