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Information about bugs and taps


NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
Bug Detection on Home phones
(COURTESY OF DR JIMMY AND MR JIM)

First of all to test for bugs, you need a VOM (Multimeter) the higher the
impedance the better (a Digital with FET circuitry or a Vacuum Tube Volt
Meter is the best).

First disconnect the phone line(s) AT BOTH ENDS. Undo the phone
instrument and hook it up to the entry point of the phone line from the
outside world (Ma Bell does not like you cut her off completely.) The
scheme is the physi- cally isolate your house, apartment, etc from the
outside world. But before you do this measure the line voltage (It
should be approximately 48 Volts).

Now with the wires disconnected at both ee set your resistance scale to a
high reading and measure the resistance of the phone line, it should be
very high on the order of million ohms or more, this is the normal
condition, since you are measuring the resistance of an open circuit. If
it is much less, say 50-100Kohms then you a device on the line that does
not belong there, probably a parallel bug.

Now twist the end of the disconnected wire and go to the other end and
measure the resistance of this. This resistance should be about one ohm
or two at the most in a big house with a lot of phones. If it is more,
then you probably have a series bug.

if in the first case, taking parallel measurements using a meter (not LED/
LCD) and you notice a "kick" in the needle, you probably have a line tap

Now if you also make a measurement with the wire end twisted together and
you notice the resistance reads about 1-2kohms, then you may have a
drop-out relay. A drop-out relay is a relay that senses a phone going off
hook, and signals a tape recorder to start recording.

 
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