Low Frequency
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送交者: jiangzhaiwai 于 2008-05-14, 00:00:19:
回答: 还是不明白军队是靠什么通讯的 由 oztiger 于 2008-05-13, 23:00:34:
(think of AM radio and lower) can go a long distance and go around obstacles. but equipment is bulky and needs a lot of power.
submarines using VLF (very low frequency) can communicate around half the world, at very low data rate though.
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