Raymond D. Jennings, Lewis E. Vogler, and Judith J. Stephenson

Abstract: This report describes an initial computer program that produces statistical frequency-distance curves. The computer program has been developed as a tool for use by the frequency managers' community of OTP/IRAC. The statistical frequency-distance curves estimate the minimum distance separation that is required between a victim receiver and an interferer as a function of the frequency offset between them. The curves are parametric in the probability or percent of time that interference is permissible. The model uses statistical variations in antenna gain and propagation loss to compute the probability of interference. Appendices of the report describe the propagation loss and antenna gain models and the method used to combine them to produce the statistical frequency-distance curves. Operating instructions and several sample applications also are included as appendices.

Keywords: electromagnetic compatibility (EMC); interference; emission spectrum; statistics; computer model; frequency management; propagation loss; frequency separation; distance separation; frequency distance curve; off-frequency rejection; receiver selectivity

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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