Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Margo PoKempner

Abstract: The chronological development of the available methods for predicting medium frequency sky–wave strengths is presented with a brief discussion of each method. Measured field strengths for 36 medium frequency sky–wave paths are compared with the predicted field strengths from several different prediction methods. Based on the rms errors between observations and predictions, the 1938 Cairo Curves provide the best estimates of the sky–wave field strengths for very long paths worldwide. A new prediction method developed for use in North and South America only, provides improved estimates of the sky–wave field strengths for paths ‹3500 km.

Keywords:


To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
lsegre@ntia.doc.gov


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.

Back to Search Results