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本文主要介绍了我国首次进行的大功率中波广播发射机间引起电离层交叉调制效应的实验情况及测量结果,并根据大量测量数据及对电离层反射点电场强度的计算,给出交叉调制百分数与反射点电场强度关系曲线,用以推算不同的反射点电场强度时的交叉调制干扰程度;同时对交叉调制对节目质量影响程度进行主观评价,以便找出节目受干扰的可容忍限度。本文提出了可以接受的最大交叉调制百分数的新建议值为8.9%,对CCIR建议书498—1附录1做了重要补充。
This paper mainly introduces the experimental situation and measurement results of the ionospheric cross-modulation effect caused by the first large-power medium-frequency broadcast transmitter in our country. Based on a large amount of measurement data and calculation of the electric field intensity of the ionospheric reflection point, the cross modulation percentage And the reflection point electric field intensity curve to calculate the different reflection point electric field intensity of cross-modulation interference degree; at the same time cross-modulation on the quality of the program subjective evaluation, in order to find out the interference tolerance of the program. The proposed new maximum acceptable cross-modulation percentage of 8.9% is an important complement to CCR Recommendation 498-1, Appendix 1.