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Non-linear junction detectors

ST 400 CAYMAN non-linear junction detector (new modification)
ST 400 CAYMAN non-linear junction detector (new modification)
ST 400 CAYMAN is the latest nonlinear junction detector of series CAYMAN and is designed for search and detection of hidden electronic devices installed in walls, floors, ceilings, fixtures, furniture, or containers, regardless of whether the electronic target is radiating, hard wired, or even turned off.
ST-401 CAYMAN - portable non-linear junction detector (new modification)
ST-401 CAYMAN - portable non-linear junction detector (new modification)
The portable modification of the basic model ST 400, without a telescopic rod.
"Lornet-24"  non-linear junction detector
"Lornet-24" non-linear junction detector
Ultracompact and lightweight nonlinear junction detector with 2400 MHz probing frequency.

The non-linear junction detector, or an NLJD, is a device that illuminates a small region of space with high-frequency RF energy. Any "non linear junction" in the vicinity—for example, and particularly, the p-n junction—will receive this energy, and because of the asymmetric response of the junction to an electric field, it will rectify it, re-emitting some of it on multiples of the illumination frequency.

The detector has a sensitive receiver tuned to these harmonics, as well as appropriate processing and displays to make their presence known to the user of the device. Because the basis of almost all semiconductor electronics is the p-n junction, an NLJD is correspondingly capable of detecting almost any unshielded electronic device containing semiconductors, whether the electronics are actively powered or not.