66 lines
3.8 KiB
Plaintext
66 lines
3.8 KiB
Plaintext
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Phone Taps
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Here is some info on phone taps. I have enclosed a schematic for a simple
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wiretap & instructions for hooking up a tape recorder control relay to 4he
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phone line. First i'll discuss taps a little. There are many
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different types of taps. There are tranmitters, wired taps and induction taps
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to name a few. Wired and wireless transmitters must be physically connected
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to the line before they'll do any good. Once a wireless tap is connected
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to the line, it can transmit all conversations over a limited range. The
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phones in the house can even be modified to pick up conversations in the room &
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transmit them too! These taps are usually powered off the phone line, but can
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have an external power source. Wired taps, on the other hand, need no
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power source, but a wire must be run from the line to the listener or to a
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transmitter. There are obvious advantages of wireless taps over wired ones.
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There is one type of wireless tap that looks like a normal telephone mike. All
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you have to do is replace the original mike with this & it'll transmit all
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conversations! There is an exotic type of wired tap known as the 'infinity
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transmitter' or 'harmonica bug'. In order to hook up one of these, you need
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access to the target telephone. It has a tone decoder & switch inside. When
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it is installed, someone calls the tapped phone & *before* it rings, blows a
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whistle over the line. The x-mitter receives the tone & picks up the phone via
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a relay. The mike on the phone is activated so the caller can hear all
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conversations in the room. There is a sweep tone test at 415/bug-1111
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which can be used to detect on of these taps. If one og these is on your line
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& the test # sends the correct tone, you'll hear a click. Induction taps
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have one big advantage over taps that must be physically wired to the phone.
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They don't have to be touching the phone in order to pick up the conversation.
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They work on the same principle as the little suction-cup tape recorder mikes
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you can get at radio shack. Induction mikes can be hooked up to a transmitter
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or be wired. Here is an example of industrial espionage using the phone:
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a salesman walks into an office & makes a fone call. He fakes the
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conversation, but when he hangs up he slips some foam-rubber cubes under the
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handset, so the fone is still off the hook. The called party can still hear
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all conversations in the room. When someone picks up the fone, the cubes fall
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away unnoticed. I use a tap on my line to monitor what ae-pro is doing
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when it auto-dials, since it doesn't take advantage of the handset on the apple
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cat ii. I can also hook up the tap to a cassette recorder or amplifier. Here is
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the schematic:
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-------)!----)!(------------->
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)!(
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CAP ^ )!(
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)!(
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)!(
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)!(
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^^^^^---)!(------------->
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^ 100K
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!
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!<INPUT
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The 100k pot is used for volume. It should be on its highest (least resistance)
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setting if you hook a speaker across the output, but it should be set on its
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highest resistance for a tape recorder or amplifier. You may find it necessary
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to add another 10-40k. The capacitor should be around .47 Mfd. It's only
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purpose is to prevent the relay in the co from tripping & thinking you have the
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fone off the hook. The audio output transformer available at radio shack
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(273-1380) is fine for the x-former. The black & green are fine for input & the
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red & white go to the output device. You may want to experiment with the
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x-former for the best output. Hooking up a tape recorder control relay is
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east. Just one of the fone wires (usu. Red) before the telephones & hook one
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end to one wire of the relay & the other end to the other relay wire. Like
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this:
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------^^^^^^^^^------------
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---------
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RELAY^^
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275-0
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