Most stations operating on shortwave frequencies are not broadcasters, however. Ham radio operators have certain frequency bands set aside for their use, and you can hear them "talking" (by voice, Morse code, radioteletype, etc.) with friends around the world. Aircraft flying international routes...
Sensors in your car tuned to radio signals from orbiting satellites can locate your car precisely at any moment and warn of traffic jams.We already have twenty-four Navstar satellites orbiting the earth, making up what is called the Global Positioning System. They make it possible to determine ...
” he said in a recent interview, “and not a major one at that because you can’t compete with what’s broadcast on all these satellites. Besides, neither the internet nor anything else can make me stop working, or make me irrelevant...