Laurance G. Hause and David R. Wortendyke

Abstract: This report describes a desk-top computer system and mathematical models which were used in seven of its programs. These programs make key calculations in the design of line-of-sight microwave systems. The models have the following ranges; bit rates up to 50 Mbits/s, carrier frequencies from 1 to 40 GHz, and path distances up to 150 km. The programs calculate, tabulate and plot information about earth geometry, path profiles and ray paths, median basic transmission loss, path-loss variability, equipment gain, link performance, and system performance. Models were chosen based on their wideness of acceptance and the size and type of data base substantiating the model. Any design engineer using this model can have immediate access to calculated results corresponding to changes in design parameters. The reasons for this capability are that the programs are written for use in an interactive mode and the programs can be used by people with no experience in programming.

Keywords: computer programs; Line-of-sight microwave; earth geometry; path profiles; basic transmission loss; digital systems; microwave link performance; multipath fading; rain attenuation

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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