Nonlinear junction detector

Purpose — Detects hidden electronics, such as bugs, transmitters, or circuit boards, by identifying nonlinear semiconductor junctions in devices.

How It Works — Emits a high-frequency RF signal and measures the harmonic responses (2nd and 3rd) generated by p‑n junctions, even when the target device is powered off.

Key Features — Adjustable probe power, dual-harmonic detection, circularly-polarized antennas, visual/audio indicators, and optional extension poles for ceiling or wall sweeps.

Applications — Technical Surveillance Countermeasures (TSCM), secure facility sweeps, vehicle inspections, corporate espionage prevention, and forensic investigations.

Advantages — Can detect electronics through non-metal barriers, works on inactive devices, and enables covert inspections without alerting targets.

Considerations — Operator training is essential, false positives may occur due to metallic objects, and local RF emission regulations must be followed.