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Detecting phone taps??

Discussion in 'Electronic Components' started by gothika, Jul 15, 2003.

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  1. gothika

    gothika Guest

    I need to run a sweep on my phone lines to detect a tap.
    What is available in the retail market these days for doing that?
    Or is it possible to build something homebrew, say something like a
    wheatstone bridge for measuring field resistances?(Know that's how it
    was done years ago.)
    The tap is going to be a physical one somewhere on the residential
    side of the line as I've had the phone company out to check
    connections and everything is clean on the feedin side.
    The patch in is going to be somewhere in the walls or under the house.
    Any info would be greatly appreciated.
     
  2. You can't really tell if there's a tap on the line, most such
    equipment is high impedance and can't be detected. You might find out
    something if you disconnect the line at the demarc where the inside
    wiring connects to the telco wiring. Then disconnect all your phones,
    etc. Then put a high voltage, maybe with something like a megohmmeter
    on the line, like maybe 500V. If there's anything on it, it will
    definitely show up. Probably won't be working afterwards, either.

    You might find more info on the ng comp.dcom.telecom.tech.


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    Subject: line with other stuff. alondra101 <at> hotmail.com
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  3. gothika

    gothika Guest

    That's what I had in mind.
    The phone company use to use wheatstone bridges to test line loads.
    They could tell precisely how many phones were on a circuit.
    They quit that when they could no longer monopolize the home phone
    market.
    I had the idea of disconnecting all my phones and the line at the
    junction box and feeding a "bit" of voltage through to fry his gear.
    (This would work with old phones prior to electronic touch tone
    models. A loud ring and smoke then dead phone.)
    There's equipment for checking phone lines, just most too expensive
    and often unavailable to the common joe.
    An infinity transmitter would do the trick. Just disconnect all phones
    in the house and activate the IT. I could then listen to his
    conversations.
     
  4. The wheatstone bridge is for resistance. They could test for line
    length if the far end was shorted, and for poor insulation etc. It
    didn't test for phones, which have almost infinite resistance when on
    hook.
    Each phone had a ringer equivalence of 1.0. So they just measured the
    impedance of the line to count the ringers. But that wasn't done with
    a wheatstone bridge.
    They didn't need to do it anymore because there was no need to, now
    that anyone with a screwdriver could legally connect a phone they
    bought at Radio Scrap.
    You could just connect an amplifier to the line if you think someone
    is using your line. Your original post did not sound like someone
    else was tapping into and actually using your line, i.e. stealing
    service from you. In that case, an easy way to prevent it would be to
    put a short on the line whenever you're not using the phones. Then
    the thief would just get a dead line. But that doesn't prevent
    someone from listening when you are using the line. That's what I
    thought you were talking about in the original post.


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    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
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