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A Comparative Study of Medium Frequency Sky Wave Field Strength Prediction Methods,

机译：中频天波场强预测方法的比较研究

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摘要

For many years FCC has been recording sky wave field strengths in the medium frequency range. Field strength prediction curves in the FCC Rules and Regulations were derived from measurements taken in 1944, a year of low sunspot number. These measurements were extended and the compilation of the results of 26propagation paths,covering in most cases an entire sunspot cycle,was released in 1971. Recently,CCIR (International Radio Consultative Committee) has re-stressed the needs for continued study on night-time medium frequency propagation curves and formulas for world-wide applications. The method that has been adopted by the European Broadcasting Union (EBU) is given in CCIR Report 264-2. In this paper,this method is referred to as the EBU method for simplicity. In addition to this, a new method has been proposed by U.S.S.R. This method has been well received in the EBU area and CCIR has solicited comments from all administrations. In this paper,this method is referred to as the U.S.S.R. method.

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