James S. Washburn; Charles M. Rush; Frank G. Stewart

Abstract: The Institute for Telecommunication Sciences has embarked upon a program to improve the techniques that are used to determine medium frequency broadcasting parameters. This work is motivated by the fact that increased transmitter power which is planned by a number of Administrations in the Western Hemisphere could seriously impact MF broadcast service areas in the United States by giving rise to unacceptable interference levels. In order to provide a technically accurate tool for use in assessing the performance of MF broadcast operations, efforts have been undertaken to develop a capability to determine the broadcast service area, taking into account both groundwave and skywave modes of propagation. In addition, a program of monitoring long distance skywave signals has been initiated as part of a joint NTIA/FCC endeavor. These long-distance signals will be used to form the basis for changes in existing MF skywave prediction programs.

Keywords: AM analysis model; MF broadcasting; MF interference; MF prediction methods; MF sky-wave signal observations

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Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
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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.

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