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用９００ ＭＨｚ 无线电波对两个综采长壁工作面进行测试得出， 在以接收电平和距离为变量的曲线图上， 在近区和远区之间有个转折点． 计算了这两个煤矿长壁工作面上的转折点前、后的传播损失的方指数及标准平方差， 显示出这一频率在工作面传播具有很大的衰减．
Using 900 MHz radio waves to test two fully mechanized longwall facets, there was a turning point between the near and far regions on the graph with the receiving level and distance as variables. The square exponent and standard deviation of the propagation loss before and after the turning point on the longwall face of the two coal mines were calculated. It shows that this frequency has a great attenuation in the working face.