Eavesdropping Detection
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Steve Dickson

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Bug DetectorBug 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.

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.

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
Radio Frequency Detection Equipment

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.

Telephone SurveillanceTelephone 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
audio amplifier

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

Site structure created by Neil Villette Site written by Steve Dickson