NR-900S (NLJD)

Non-linear Junction Detector (NLJD)



Areas of applications:
Detection of mobile phones.
Searching of Improvised Explosive Devices (electronic control systems of IEDs) at background of complex man-made interference from urban constructions.

New non-linear junction detector NR-SOUND, ensuring sensitivity not worse than minus 140dBm.
Range of detection is comparable to the nonlinear detector NR900EK Eagle.
A non-trivial solution for the receiving tract provides for the possibility of fine structure analysis of the reflected signal.
For the first time the possibility of identifying and selecting of active electronic targets against a background of interfering noise generated by other electronic devices is realized.
Modular design solution provides for operational use of NR-900S (Sound) in a compact “pistol” version as well as the “rifle” version that allows take-out of the antenna on the sliding telescopic rod.

Target detection range. Standard imitator.
– test unit (maximum probing signal output & maximum receiver sensitivity): not less than 1m.
The average power of probing signal in the search mode: not more than 400mW
Sensitivity: not worse than -140dBm
Probing signal level:
– max: 0dB
– mid: 6dB
– min: 12dB
Receiver input signal attenuation: 10dB, 20dB, 30dB, 40dB
Received signal level indication:
– visual
– audio
LED display
Power supply: 2 x ‘Soshine’ 18650 Li-ion rechargeable cells 2800mAh, 3.7V
Operational condition:
Operating temperature: +5°С +40°С
Storage and shipping temperature: -20°C +50°С
Relative humidity (under +25°С) 93±3%
Continuous operation time with two sets of fully charged cells:
– Searchnig mode: not less 8h
– Listening mode: not less 1h
– Device in a ready for operation state: 1.4kg
– Main unit: 1.0kg
– Pistol-grip control unit: 0.4kg
– Rifle-buttstock control unit: 1.2kg
– Complete set in a standard packing: 7.5kg

Non Linear Junction Detectors:
In 1970s Americans detected wires in the concrete columns of the American Embassy in Moscow. The bugs were installed during the construction of the building, and there was no other way to extract them except for complete destruction of the building. One shouldn’t neglect the importance of correct frequency tuning of NLJD equipment for different types of search environment (for instance, concrete walls). Bugs or wires (as covert listening devices are commonly called) can be set up deep in concrete columns and they still will be transmitting signals. Non-linear junction detectors (NLJD) are devices designed for search and detection of different types of covert listening devices, various electronic appliances and transmitters comprising of semiconductors. The principle of NLJD equipment operation is based on emission of high radio frequency energy in an area. Detectors have a sensitive receiver designated for reception of objects’ echo signals which, for operator’s convenience, are marked down with sound or displayed on graphical user’s interface. Depending on the model, non-linear junction detectors are capable of detecting almost any electronic appliance in any operational mode: active, stand-by, switch-off. The designation of such devices consists in detection of radio microphones, microphone amplifiers, dictophones in premises (walls, floors, ceilings, furniture, etc.). Non-linear junction detectors acquired a reputation as perfect means of counter-espionage, as embassies and other diplomatic posts are known to be most popular targets for eavesdropping equipment. Specific models of NLJD are used by the police in search for weapons during events involving great masses of people. Detectors are used for providing location secure from covert listening devices in different organizations. Non-linear junction detectors can serve multiple purposes and have a wide range of implementation, starting from ground detectors up to equipment used for detection of mobile phones. Wide range of NLJD is presupposed by the type of material or surface for search operations – ground detectors are preferable for object detection in soil, portable detectors tuned to appropriate frequency are better in search within wooden furniture. Non-linear junction detectors have a very peculiar designation, therefore their usage is conditioned by goals set by customers. Taking into account great variety of NLJD equipment there is a specific model for any purpose you may require. Current NLJD products line include models for various applications.

Why Non Linear Junction Detectors?
NLJD technology has proven to be most effective in detection of semiconductors containing multiple layers of silicon, a P-Type and an N-Type. The point where they meet is called a Non Linear Junction.Non Linear Junction also appears in nature: dissimilar metals in contact with one another; the rust on metals resulting from corrosion.