subscripts to denote the subband; e.g., a signal at 1.60 GHz is designated Se. Radio frequencies have been designated for various uses within the western hemisphere in the Radio Regulations of the International Telecommunication Union, which meets in Geneva, Switzerland. A sample of these regulations appears in Table 8-2 for the frequency range 450 MHz to 6.425 GHz, illustrating the proportion of allocations devoted to aerospace use [Reference Data for Radio Engineers, 1968].

Table 8-2. Designations of Radio Frequencies Between 450 MHz and 6.425 GHz; Aerospace Frequencies Are Underlined. (From Reference Data for Radio Engineers [1968].)
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