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 Bug Detector - The bug detector page is an introduction to counter espionage measures and includes information on RF detectors and telephone bug deactivators with access to bug detector suppliers.
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The eavesdropping detection page reviews radio frequency detectors, audio amplifiers and thermo imaging devices with access to other sources of eavesdropping detection equipment and services.
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introduction to eavesdropping detection
This is about you finding out whether you are being spied on !
There is much written about how good the cheaper equipment really is, well, they work, but you get what you pay for
and the better the eavesdropping detection equipment, the better your chance of finding eavesdropping devices.
Here are some of the more advanced systems :
radio frequency detector
Transmitter detection is a tricky process - eavesdropping detection
The bad guy has the entire radio frequency spectrum to choose from and has a whole host of different modulation
techniques to use. Modulation techniques control how the sound is transmitted. Common ones include those you use
every day: Amplitude Modulation (AM), Frequency Modulation (FM), Narrow Band FM, and others. More exotic modulation
types include single side band, subcarrier, spread spectrum, frequency hopping and various other digital types where
the analog audio is converted into data.
Eavesdropping detection transmitters can operate on frequencies as low as 20 kHz, using the AC power lines or telephone lines to carry the
signal. Transmitters can operate up into the microwave frequencies, too.
You just don't know what background, ability and equipment the bad guy has access to, so the entire
spectrum and all of the different modulation techniques have to be considered and examined. Plus, there really is
no way to tell how much power the eavesdropping detection transmitter has. It might be an 80 milliwatt transmitter that will
go several hundred yards or a much weaker transmitter than only has to transmit a few dozen feet to a hidden receiver.
This makes the RF sweep a detailed and time consuming task. Quick and easy is not a concept that good
technicians are familiar with.
Traditionally, the frequency ranges of eavesdropping detection devices covered during a sweep start just above sound and end
in the microwave ranges.
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 Telephone Surveillance - If you are concerned about telephone surveillance, then this page provides information about transmitters and call loggers with access to articles about other telephone surveillance techniques.
Audio amplifiers
A high gain audio amplifier may be needed to test for a number of vulnerabilities. It can test speakers for their
ability
to act as microphones. Low voltage wiring is tested for audio from the area being swept. With its contact microphone,
it test wall surfaces, plumbing and HVAC installations for the ability to pass audio. The eavesdropping detection amplifier can also power
devices that are attached to the wiring being tested, aiding in their rapid detection.
Thermo imaging equipment
A new important tool in a eavesdropping detection sweep is Infrared Thermography. Our thermal imaging camera is used on all sweeps to detect
the infrared heat signature emitted by listening devices.
Here's how it works:
Visible light is reflected from the surface of objects. This appears to your eye as color and brightness. At the same
time, the objects you see also emit or radiate infrared energy. This energy is not based on reflectivity of the object
or on its color or intensity; it is based on the temperature of the material that makes up the object.
Listening devices create a small amount of heat as electricity powers their circuitry. Even very faint amounts of heat
are visible against the normal infrared background that the eavesdropping detection thermal imager detects, making it possible to find devices
hidden in wall cavities or built into furniture and furnishings.
In our mission to provide state of the art service in detection techniques, we continue to use the latest in emerging
technology to enhance our capabilities. Infrared Thermography is another valuable tool; not inexpensive, it
demonstrates our dedication to doing the job to the best of the ability of our technicians and technology.
The most relevant links we could find, placed here free
 TSCM Tech
- A leading supplier of eavesdropping detection and electronic espionage prevention services with more than 18 years experience. www.tscmtech.com
Murray Associates
- more on eavesdropping detection - but you will have to sign in ! www.kevin-d-murray.com
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