以下为句子列表：
英文: Coupling can happen at different places of the uplink and downlink channels.
中文: 上下行信道之间产生耦合的原因有多种，避雷设施的安装不当也是其中之一。
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英文: Downlink - The part of a satellite system that includes the satellite itself, the receiving earth station and the signal transmitted from the satellite to earth stations.
中文: 下行-卫星运行系统的一部分，包括卫星、地面接收站以及由卫星传送到地面接收站的节目信号。
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英文: It is mainly appeared as the electromagnetic wave coupled into less shielded IF cable, the IF retransmit caused by the coupling between uplink and downlink in an earth station, and the frequency hopping or sweeping interference caused by an unlocked uplin
中文: 其表现主要有，因中频电缆屏蔽不佳而产生的串扰，因地球站上下行通道存在耦合而出现的中频转发，以及因上行设备频率源失锁而引致的跳频或扫频干扰。
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英文: Scan for downlink channel and establish synchronization with BS.
中文: 用户端设备扫描下行信道，之后于基站建立同步。
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英文: The procedure to remove cross-pol interference is usually to determine where the interference come from, and then to adjust the polarization angle of the relative uplink or downlink antenna.
中文: 排除反极化干扰的步骤通常为，判断干扰源自上行抑或下行，然后调整失调天线的极化角。
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