It is not that easy to track down signal source especially for
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送交者: steven 于 2008-06-03, 12:48:10:
回答: 我不懂信号技术。 不过我猜肯定有先进的技术 由 true 于 2008-06-03, 11:01:36:
non-frequent encrypted signal. Since the enemies don't know what frequency your equipment works on, your signals appear pretty much like background noise. The reason you can scan FM/AM radio stations because those signals are broadcasteded according to certain protocols which can be recognized. Surely, no country will tell its enemy about its own military communication.
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