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

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Radio <strong>and</strong> wireless communications overview 28117.4 Summary of radio characteristics of VHF/UHFThe following table summarizes the information that was discussed in this section.Low b<strong>and</strong>VHFMid b<strong>and</strong>VHFHigh b<strong>and</strong>VHFPropagation mode Mostly L.O.S. L.O.S.some surface Minimal surface L.O.S.wavewave<strong>Data</strong> rates600 Baud 1200 Baud 2400 BaudDiffractionproperties Excellent Very good GoodNatural noiseenvironment High Medium LowAffected by manmadenoise Severe Bad SomePenetration ofsolids Excellent Very good GoodFading by ductingLong term Medium term Short termAbsorption by wetvegetation Negligible Low SomeEquipmentavailability Minimal Reasonable ExcellentRelative equipmentcost High Medium LowUsesTable 17.2VHF radio characteristics- In Forestedareas- Mostly mobile- Very hilly- Very hilly &Forested areas- Mostly mobile- Over water- LongDistance /L.O.S. / hillyareas- L.O.S. links- Mobile- Borefields- Over water

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