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Practical Industrial Data Networks:Design, Installation and ...

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280 <strong>Practical</strong> <strong>Industrial</strong> <strong>Data</strong> <strong>Networks</strong>: <strong>Design</strong>, <strong>Installation</strong> <strong>and</strong> Troubleshootingregulatory body. Table 17.1 illustrates the typical sections of the radio spectrum allocatedfor public use around the world. Each section is referred to as a b<strong>and</strong>.Ultra HighFrequency(UHF)Mid B<strong>and</strong>UHFLow B<strong>and</strong>UHF960 Mhz800 Mhz520 Mhz335 MhzHigh B<strong>and</strong>VHF225 Mhz101 MhzVery HighFrequency(VHF)Mid B<strong>and</strong>VHF100 Mhz60 MhzLow B<strong>and</strong>VHF59 Mhz31 MhzHighFrequency(HF)30 Mhz2 MhzTable 17.1The radio spectrum for public useCertain sections of these b<strong>and</strong>s will have been allocated specifically for telemetrysystems.In some countries, a deregulated telecommunications environment has allowed sectionsof the spectrum to be sold off to large private organizations to be managed, <strong>and</strong> then soldto smaller individual users.Application must be made to the government body, or independent groups that holdlarger chunks of the spectrum for on selling, to obtain a frequency <strong>and</strong> no transmission isallowed on any frequency unless a license is obtained.

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