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183:" cuts both ways and since detector-detectors use a similar superheterodyne receiver, many early "stealth" radar detectors were equipped with a radar-detector-detector-detector circuit, which shuts down the main radar receiver when the detector-detector's signal is detected, thus preventing detection by such equipment. In the early 1990s, BEL-Tronics, Inc. of
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as of
December 2004. However counter technology has evolved rapidly, so that by July 2008, even budget radar detectors were able to avoid detection by the device. Then, in late 2008, the Spectre IV (Elite) was released, citing improved range and reliability over the Spectre III. Radar detector
187:(where radar detector use is prohibited) found that the local oscillator frequency of the detector could be altered to be out of the range of the VG-2 Interceptor. This resulted in a wave of detector manufacturers changing their local-oscillator frequency. The VG-2 is no longer in production.
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that radiates slightly. It is therefore possible to build a radar-detector detector, which detects such emissions (usually the frequency of the radar type being detected, plus about 10 MHz for the
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manufacturers produce some models undetectable by the
Spectre Elite beyond a distance of a few inches, making them immune in real-world situations.
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The VG-2 Interceptor was the first device developed for this purpose, although more current technology such as the
Spectre III (Stalcar in
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However, like any device that detects stray emissions from electronic equipment, it is easily defeated by using adequate shielding.
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Sensor used by the police to detect radar detectors
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