首先，空白频段发射机必须避免与本地电视台互相干扰，也得防止同会议室、运动场、剧院和教堂使用的无线麦克风相互干扰。
For one thing, white-space transmitters have to avoid interfering with both local television stations and the wireless microphones used in conference halls, sports arenas, theatres and churches.
这两个光子一起发射出去，形成相干辐射。
传统的相控阵体制雷达都是采用全相干信号，通过控制各发射单元信号之间的相位使得雷达波束指向发生改变。
The phase array radar USES same signal, and controls the phase of each transmitter signal. So the direction of beam-form can change.
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