Phone Taps by The Jolly Roger

Here is some info on phone taps. In this file is a schematic for a

simple wiretap & instructions for hooking up a small tape recorder

control relay to the phone line.


First, I will discuss taps a little. There are many different

types of taps. there are transmitters, wired taps, and induction

taps to name a few. Wired and wireless transmitters must be

physically connected to the line before they will do any good.

Once a wireless tap is connected to the line,it can transmit all

conversations over a limited reception range. The phones in the

house can even be modifies to pick up conversations in the room

and transmit them too! These taps are usually powered off of the

phone line, but can have an external power source. You can get more

information on these taps by getting an issue of Popular

Communications and reading through the ads. Wired taps, on the

other hand, need no power source, but a wire must be run from the

line to the listener or to a transmitter. There are obvious

advantages of wireless taps over wired ones. There is one type of

wireless tap that looks like a normal telephone mike. All you have

to do is replace the original mike with thisand itwill transmit

all conversations! There is also an exotic type of wired tap known

as the 'Infinity Transmitter' or 'Harmonica Bug'. In order to hook

one of these, it must be installed inside the phone. When someone

calls the tapped phone & *before* it rings,blows a whistle over

the line, the transmitter picks up the phone via a relay. The mike

on the phone is activated so that the caller can hear all of the

conversations in the room. There is a sweep tone test at

415/BUG-1111 which can be used to detect one of these taps. If one

of these is on your line & the test # sends the correct tone, you

will hear a click. Induction taps have one big advantage over taps

that must be physically wired to the phone. They do not have to be

touching the phone in order to pick up the conversation. They work

on the same principle as the little suction-cup tape recorder

mikes that you can get at Radio Shack. Induction mikes can be

hooked up to a transmitter or be wired.


Here is an example of industrial espionage using the phone:

A salesman walks into an office & makes a phone call. He fakes

the conversation, but when he hangs up he slips some foam rubber

cubes into the cradle. The called party can still hear all

conversations in the room. When someone picks up the phone, the

cubes fall away unnoticed.

A tap can also be used on a phone to overhear what your modem is

doing when you are wardialing, hacking, or just plain calling a

bbs (like the White Ruins! Denver, Colorado! 55 megs online!

Atari! Macintosh! Amiga! Ibm! CALL IT! 303-972-8566! By the way, i

did this ad without the sysops consent or knowledge!).


Here is the schematic:



Cap ^ )!(





^ 100K


! <Input


The 100K pot is used for volume. It should be on its highest

(least resistance) setting if you hook a speaker across the

output. but it should be set on its highest resistance for a tape

recorder or amplifier. You may find it necessary to add another

10 - 40K. The capacitor should be around .47 MFD. It's only

purpose is to prevent the relay in the phone from tripping &

thinking that you have the phone off of the hook. the audio output

transformer is available at Radio Shack. (part # 273-138E for

input). The red & the white wires go to the output device. You may

want to experiment with the transformer for the best output.

Hooking up a tape recorder relay is easy. Just hook one of the phone

wires (usually red) to the the end of one of the relay & the ther

end just loop around. This bypasses it. It should look like this:





(part #275-004 from Radio Shack works fine)


If you think that you line is tapped, the first thing to do is to

physically inspect the line yourself ESPECIALLY the phones. You

can get mike replacements with bug detectors built in. However, I

would not trust them too much. It is too easy to get a wrong



For more info:




remember who this one is from... you might want to try Paladin