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Bugs TSCM NLJD Audiotel
Diode used as bug simulator
Over the years, a wide variety of
bug detectors, direction finders and bug tracers
have been developed. Although it is relatively easy
to locate a bug
that is transmitting permanently, new generation bugs
are often remote controlled, so that they can be turned off when not needed.
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Furthermore, bugs can be voice activated (VOX) or controlled
by another piece of equipment, such as a public addressing system (PA),
in which case the bug is likely to be turned off when the room is
checked for bugs (bug sweep).
In such cases, the only way to detect a bug is by using a so-called
non-linear junction detector (NLJD),
like the Audiotel Scanlock SuperBroom.
An NLJD is capable of finding bugs that are switched off completely,
by detecting the PN-junctions that are present in all semiconductors,
such as transistors, diodes and computer chips.
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By 'illuminating' the PN-junction of a semiconductor with a strong RF signal
of a certain frequency, the semiconductor re-radiates harmonics of that
frequency. This phenomenon is also known as harmonic backscattering.
By observing the 2nd and 3rd harmonics reflected by an object,
the NLJD can discriminate between electronic devices and corroded metals.
As the amount of
energy reflected by a miniature electronic circuit is extremely low, the
quality of the NLJD and particularly its filtering is of the utmost importance,
and requires a well-trained and capable operator.
As it is necessary for the operator to train his skills regularly,
Audiotel
produced a dummy bug in the shape of a
hockey puck. The puck
is made of plexiglass and carries just a
schottky diode
at the center. The diode is not connected to anything, and its wires act as antennas.
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© Crypto Museum. Created: Tuesday 30 April 2013. Last changed: Wednesday, 05 November 2025 - 11:09 CET.
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