The only mechanisms for radio propagation beyond the horizon which occur permanently for frequencies greater than 30 MHz are those of diffraction at the Earth’s surface and scatter from atmospheric irregularities. Attenuation for diffracted signais increa
ITU-R P.617-1-1992由国际电信联盟 IX-ITU 发布于 1992-01-01。
ITU-R P.617-1-1992 在中国标准分类中归属于: L24 安装、接线连接件。
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