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发表于 2017-1-9 20:12
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gracegenie 发表于 2017-1-9 16:31
桉树为啥能影响信号？
Alan Young, Research Leader with CSIRO Telecommunications and Industrial Physics. "Trees of any sort have been known to block radio signals - they both absorb the signal and scatter it in many directions."
Dr Young's team have conducted measurements in rural areas and have recorded lower signals when they passed trees. "I don't think it's peculiar to gum trees; there is no evidence that gum trees are worse than introduced trees," he said.
It does appear, however, that moisture is the culprit. A dead tree absorbs fewer signals than a live tree without leaves, which absorbs less than a tree with leaves. Live trees with leaves that have rain on them absorb the most signals.
http://www.abc.net.au/science/articles/2002/06/12/578753.htm |
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