搜索 - 科创

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目前机房尚有大量开关电源在运用，包括中继台电源。应改用线性电源，或至少采用全屏蔽且带PFC、带滤波器的开关电源。大量应用磁环可能也是有利的。目前关掉总闸，噪底还可以明显下降，可见局部整顿的重要性。

业余信标台和空间业余无线电台呼号的第二部分由字母J表示，业余中继台呼号的第二部分由字母R表示。3.表2中未列入的双字母、三字母呼号后缀由国家无线电管理机构负责分配。

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