LUX Non Linear Junction Detector (NLJD)

The LUX non-linear junction detector (NLJD) is designed to detect covert electronic devices containing semi-conductor components such as radio microphones, microphone amplifiers, tape, and digital recorders, etc. inactive or inactive states. The generation of microwave signals in the Non-Linear Junction Detector, when in contact with transistors, diodes or chips re-emits certain higher frequencies, the re-emitted signal is received on the antenna and processed showing the 2nd and 3rd harmonics on LED indicators & earphones.

Mode “20 K” allows listening to the low-frequency signal of an operating device, a tape recorder, radio or microphone amplifier and is a powerful tool for obtaining better information about the type of nonlinear device (bug) being detected. In this mode, signals at frequencies of harmonics received by the unit, are modulated by a low-frequency signal existing in the electronic circuits of a device.

For parameters such as work safety (radiation in the opposite direction), continuous battery operation time, fast deployment and ergonomics, etc. The LUX detector surpasses other equipment on the market. This is ensured by the original circuit and design solutions.

An important feature of the product is the absence of additional units attaching to the connectors, which typically reduces the reliability of the device and creates inconveniences for the operator.

RESOLUTION: The resolution of each LED indicator is 3dB and the received signal can also be heard with the accompanying earphones.

AUTOMATIC SELECTION: The system automatically selects the best frequencies (not interfering with GSM range) allowing the surveillance bug detector to work in a concentrated environment.

ADJUSTABLE: The LUX Non-Linear Junction Detector’s transmitter power can be adjusted as well as the receiver’s sensitivity.

CAPABILITY: The LUX operates in pulse mode with a radiated power of 25 watts per pulse, this allows for higher (-120 dbm/-150db/W) sensitivity of the receivers. Therefore the LUX matches or exceeds the most powerful current Non-Linear Junction Detectors (NLJD) available. This is achieved by optimizing the parameters of the signal in conjunction with a superior antenna system.

UNIQUE DESIGN: Ergonomic and light (1.3 kg including battery) with extendable/retractable poll inside the handle for superior reach, also the surveillance equipment detector’s innovative screw-in battery extends the handle further.

USAGE PARAMETERS: Operation speed, product safety, ergonomics, battery and continuous usage time (not less than 5 hours), the LUX meets and even exceeds current NLJDs on the market.

Technical Specifications:
Frequency band: 900.2 MHz ± 1 MHz
Frequency step: 200 KHz, totally 21 channels (±10 steps)
Modulation: Pulse
Maximum output power per pulse: 25W ± 1 dB
Minimum output power per pulse: 1.6 dB
Frequency bands: 1800.4 MHz and 2700.6 ± 1 MHz (x2,x3)
Sensitivity of each receiver: -120 dBm at S/N 3dB (-150 dB/W)
Dynamic range: at least 30 dB
Manual receiver gain: four stages of (±1 dB) in each stage
20k Mode – transmitter emits signals modulated by the amplitude of the sequence of radio pulses: demodulation width signal spectrum is 500-2000 Hz.
Number of antennas: 3 (three), combined in a single unit
Beam width of Tx/Rx antennas at – 3dB level: 90 degrees
Polarization of Tx/Rx antennas: circular polarization with an elliptical ratio up to 1.5
Tx/Rx antennas: coaxial pattern, maximum deviations of the main lobe, not exceeding 50


  • Control unit is a transmitter and two multi-channel high sensitivity radio receivers which tunes to the 2nd and 3rd harmonics frequencies.
  • Key Function controls and LED Indicators are controlled via the control panel.
  • Uncluttered controls and high visibility of the indicators show the ease of use of the unit.
  • The Surveillance Bug Detector tuning is assisted with two special NLJD imitators included in the kit.
1 x LUX Non-Linear Junction Detector Antenna (3in1) attached to Control Panel with an extendable pole.
1 x Detachable screw-in re-chargeable battery with an external charger.
1 x Headphones set.
2 x Non-Linear Junction Detector imitators for tuning.
1 x 220 V/50 Hz Charging unit (110 V/60 Hz adaptor optional)

1 x Carry case.

LUX Applications:
  • Ideal for Police and law enforcement agencies, private investigators for counter surveillance bug cleaning and bug sweeping operations.
  • Organizations requiring Technical Surveillance Countermeasures (TSCM) Equipment for securing their environments from covert listening or eavesdropping devices.

* LUX: Winner “Best Choice for Sweep Teams” at Milipol Paris.


* Contact us for pricing information
* Quantity discount pricing available.
* 1-year warranty

Specialized Countermeasures and Intelligence Solutions

Contact Us

(416) 414-7231

Mailing Address

5979 Baldwin St. S P.O. Box 30022 Whitby, Ontario Canada L1M 0B5