Radar detector detector

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A radar detector detector (RDD) is a device used by police in areas where radar detectors are declared illegal.

The Spectre III (Stalcar in Australia) RDD alerts its user when it senses the presence of a radar detector. It does this by detecting the radio frequency “leakage” emitted by the local oscillators of all radar detectors, as they are based on superheterodyne receivers. In fact, only the Spectre III detects every radar detector certified for operation in the United States by the Federal Communications Commission as of December 2004. Several detector manufactures are developing SPECTRE-resistant models.

However, as radar detector detectors are based on the same principle, some radar detectors can detect the detector detectors, and shut down the primary receiver, evading detection by the police equipment.