早期的移动电话使用模拟信号，他比后来的数字信号手机发射出功率更强的信号。

Earlier mobile phones used analogue signals which emitted higher power signals than the later digital models.

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每个蜂巢装备有小功率的无线电发射器和接收器，使信号能在手机用户之间传播。

Each cell is equipped with a low-powered radio transmitter and receiver that permit propagation of signals among cell-phone users.

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功率分析仪可控制只读取在信道内的发射功率，假定该手机要发射信号。

The RF power analyzer is programmed to read the power only in the channel in which the mobile device is supposed to be transmitting.

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