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Finding a tap on your phone line
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BUG DETECTION ON HOME PHONES
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 PHYSICALLY
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 ENDS, 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
LEDLLCD) 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.
ANOTHER TEST TO DO WITH THE PHONES STILL HOOKED UP TO THE OUTSIDE WORLD, ON
HOOK VOLTAGE IS ABOUT 48 VOLTS AND OFF HOOK IS ABOUT 6-10 VOLTS. ANY OTHER
CONDITIONS MAY MEAN TELEPHONE SURVEILLANCE.
IF YOU USE A WIDE RANGE AUDIO FREQUENCY GENERATOR AND CALL YOUR HOUSE,
APARTMENT, ETC. FROM ANOTHER PHONE AND SWEEP UP AND DOWN THE SPECTRUM, AND YOU
NOTICE THE PHONE ANSWERS ITSELF SOMEWHERE IN THE SWEEP YOU PROBABLY HAVE AN
INFINITY TRANSMITTER ON YOUR LINE.
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