Military radio surveillance from space
When you make a phone call, the signals that leave your phone travel along copper wires or cables to the local exchange if you are using a land line or by radio link to relay towers if you are using a cell phone or by radio link to a WiFi router, cable or wire if you are using the internet. The signals then are routed by the phone company or internet service provider to their destination through cables, wires, radio links or whatever route is cheapest and least congested. If the caller and receiver are far apart, the signals may travel by microwave radio link or via undersea cables or by radio through satellites. You have no control over what route your call takes and, indeed, you have no idea what that route is – it will vary from time to time, depending on congestion across the phone network.
KeywordsRadio Link Radio Signal Geostationary Orbit Voice Over Internet Protocol Military Communication
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