The non-linear junction detector “LORNET-24” (further NLJD) is used for search and location of electronic devices both in active and switch-off state. The detector operation is based on the property of semiconductor components to generate a response at the 2d and 3d harmonics when radiated by an RF probing signal. Semiconductor components of artificial origin will have a higher level second harmonic while semiconductor components of natural origin (e.g. oxide films) will have a higher level third harmonic respectively. An NLJD analyzes the 2d and 3d harmonics response of the radiated objects, which enables a quick and reliable identification of electronic devices and natural oxide semiconductors. The NLJD “LORNET-24” automatically finds the best receiving frequency channel free of noise and distortion providing flawless operation even in the complicated electromagnetic environment. The frequency tuning algorithm implemented in “LORNET-24” automatically selects the RF probing signal frequency such that the noise level in 2d harmonic receiving channel is held minimal, while digital processing of a demodulated signal gives maximum sensitivity.

There are two types of radiated signals:
- continuous wave carrier (CW);
- pulse modulated carrier with duty cycle 40 (pulse).

This enables to combine wide detection range and reliable identification of the devices found.
Output power automatic control mode significantly simplifies operator’s work. “LORNET-24” simultaneously displays the 2d and 3d harmonics levels at its LED panel. Besides, the 2d and 3d harmonics levels can be estimated in turn aurally by click repetition rate reproduced through a built-in loudspeaker or wireless earphones. The detector of the curved over-radiated UHF-signal enables to detect operating edevices containing acoustic transformer in the CW mode of carrier frequency aurally.