The test results show that the influence of discharge location on coupling signal is weak.

试验验证，在一定范围内，放电方位的变化对耦合信号的影响不是很明显。

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In some special scenarios, such as road tunnels or tall buildings, the satellite signal is weak or indiscernible.

而在某些特殊的场景，如隧道或高楼路段，卫星信号较弱甚至无信号。

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PD signal is weak signal, so the first problem of on-line monitoring is how to pick up the weak anti-stationary random signal.

由于局放信号属于弱脉冲信号，因此实现在线监测的首要问题是如何从强干扰中提取弱的非平稳随机信号。

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One of the complications with the MicroCell is that in order to avoid interference with local cell towers, it adjusts how strong the signal that it generates in your house is based on how weak your actual cell signal is at the time of initial activation.

FORBES: Some AT&T MicroCell Users Are Experiencing Problems With iPhone 5 and iOS 6

For instance, Toshiba says its robot has a wireless network that can be controlled in high radiation, looking for a better signal when reception is weak.

BBC: Robot 'race' to fix damaged Fukushima nuclear plant

Still, this is a signal of a weak economy.

FORBES: The Stock Market And Recessions