功率计算单位db和dbm有什么区别，怎么换算？ - 知乎
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通过使用 dBm 公式求解 P，输出功率也可以表示为 20 mW。所以，dBm 表示 “1 毫瓦以上的 dB”（没有符号即假定为正），而 - dBm 则解释为“1 毫瓦以下的 dB”。dBm 的优点与 dB 相似；它使用紧凑的数字，并且允许在级联传输系统中的增益或损耗时使用加法代替乘法。
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