These formulas are suitable for computer-aided electromagnetic compatibility (EMC) analysis and land mobile communications engineering.

表示式适用于机助电磁兼容（EMC）分析和陆地移动通信工程。

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The FCC (Federal Communications Commission) sets spectral masks or adjacent-channel-power-ratio requirements on some services, such as land mobile radio.

FCC(美国联邦通信委员会)规定一些设备上，如地面移动无线电，频谱遮罩或邻近信道功率比的需求。

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