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Question on cell phone stuff

Discussion in 'Electronic Basics' started by Wayne Lundberg, Sep 14, 2006.

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  1. How could I detect the presence of a nearby cell phone? I'm assuming most
    are sending out a query pulse every millisecond in search of a matching
    signal that would make them ring. So they are transmitting a signal
    continuously in human terms. What kind of circuit do I need to develop to
    detect nearby cell phones? And in so doing come up with a device to detonate
    the detonators plugged into IEDs and other terrorist bombs?
     
  2. Tim Auton

    Tim Auton Guest

    Why on earth would they do that? It would be a fantastic waste of
    bandwidth and power. Idle cell phones do talk to the network, but only
    every several minutes, not a thousand times a second. The rest of the
    time it's just listening. The network sends a signal to let it know when
    to ring.

    Put your phone right next to a TV or stereo. You'll can tell from the
    interference exactly how often it speaks to the network.


    Tim
     
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