Nomograms for the Calculation of Propagation Effects on Tactical Millimeter-Wave Radio Links

by William Sollfrey

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Description of the development and use of nomograms for calculating propagation effects on tactical millimeter-wave radio links. The principal causes of attenuation in the millimeter-wave band (35-75 GHz) are oxygen absorption, which depends on radio frequency, and rain scattering, which depends on frequency and rain rate. The nomograms display these dependencies and the range equation, and may be used to calculate communication system performance as a function of range, frequency, and rain rate by simply drawing straight lines between scales. Use of the nomograms is illustrated by several worked examples. By following the techniques demonstrated in the examples, the user should be able to solve link performance problems speedily and simply.

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