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一、引言1974~1975年在日内瓦召开的第一、三区长、中波广播会议规定,在第三区的亚洲部分对中波天波场强的计算采用“开罗曲线”法~[1,2] 开罗曲线是1938年在开罗召开的一次国
I. INTRODUCTION The first and third mayors’ and medium-wave broadcasting conferences held in Geneva from 1974 to 1975 provided that the calculation of the field intensity of the midwave-day sky waves in the Asian part of the third area adopted the “Cairo Curve” method [1,2 The Cairo curve was held in Cairo in 1938