M. E. Johnson and G. D. Gierhart

Abstract: This report provides an atlas of air/ground and air/air basic transmission loss predictions made with the IF-77 (ITS-FAA-1977) propagation model. Sets of predictions are provided for each of six frequencies; i.e., 0.125, 0.3, 1.2, 5.1, 9.4, and 15.5 GHz. Each set contains curves for 90 antenna height combinations where one antenna height varies from 3 to 30,000 m, and the other varies from 300 to 30,000 m. Each height combination is repeated for three time availabilities: 0.05, 0.5, and 0.95. Hence, 1620 transmission loss versus distance curves are provided. The maximum d1stance used iS 1800 km. Propagation factors and application considerations are discussed. Example problems are used to illustrate the various application methods provided.

Keywords: interference; computer program; air-to-ground propagation; propagation model; transmission loss; air/air; frequency sharing; navigation aids

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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