NLJDmini

PORTABLE NON LINEAR JUNCTION DETECTOR

The NLJDmini is a compact non linear junction detector designed for locating concealed electronic devices and semiconductor components in security sensitive environments. The system enables operators to detect hidden electronics regardless of whether the devices are active, in standby mode, or completely powered off.

By transmitting a probing signal and analyzing harmonic responses generated by semiconductor junctions, the detector identifies electronic components commonly found in mobile phones, SIM cards, GPS trackers, covert microphones, and other surveillance or communication devices. This detection method allows operators to locate concealed electronics even when they are shielded inside walls, furniture, plumbing, or other structural cavities.

The NLJDmini is optimized for portable inspection operations and technical surveillance countermeasures, enabling rapid sweeps of facilities, vehicles, and concealed spaces where hidden electronics may be present. The device is particularly effective in correctional facilities where inmates may attempt to hide unauthorized communication devices to bypass traditional security controls.

Technical & Functional

Key Features

NLJDmini

Detection of Powered Off Devices

Identifies passive semiconductor components even when electronic devices are switched off or not transmitting signals.

Non Linear Junction Detection Technology

Detects semiconductor junctions inside electronic circuits using harmonic signal analysis.

Compact and Lightweight Design

Main unit weight of approximately 350 g allows single operator use in confined spaces. 

 

Telescopic Inspection Handle

Adjustable inspection handle extending from approximately 27 cm to 90 cm enables floor to ceiling inspections and access to difficult areas.

Visual and Audio Alerts

Immediate feedback through display indicators, buzzer signals, and optional headphones.

Adjustable RF Output Control

Supports automatic or manual RF output adjustment for different inspection environments.

Portable Inspection Kit

Lightweight system designed to fit into standard inspection kits and tactical equipment.

Extended Battery Operation

Rechargeable battery system enabling up to four hours of continuous inspection operations.

HANDHELD NLJD PROBE

The NLJDmini inspection probe enables precise detection of concealed electronic components by identifying semiconductor junctions inside hidden devices such as mobile phones, SIM cards, and covert transmitters.

NLJDmini PORTABLE DETECTION KIT

The NLJDmini system is delivered as a compact portable inspection kit containing the handheld detector unit, telescopic inspection handle, and accessories for rapid deployment during electronic threat detection and facility sweep operations.

MEETING ROOM ELECTRONIC SWEEP

The NLJDmini enables security teams to inspect meeting rooms and conference spaces for concealed electronic devices such as covert microphones, transmitters, and hidden surveillance equipment during routine security sweeps.

HANDHELD DLJDmini ELECTRONIC DETECTOR

The NLJDmini handheld detector enables operators to perform rapid inspections and locate concealed electronic components by identifying semiconductor junctions within hidden devices.

 

ELECTRONIC CONTRABAND DETECTION

The NLJDmini helps security personnel locate concealed electronic devices such as mobile phones, SIM cards, and covert transmitters during inspections in correctional facilities and other secure environments.

COMPACT ELECTRONIC SWEEP DEVICE

The NLJDmini allows operators to inspect confined areas such as furniture, walls, ducts, and structural cavities where concealed electronics may be hidden.

EXTENDED INSPECTION REACH

The telescopic handle allows operators to extend the NLJDmini inspection range for scanning walls, ceilings, ducts, and other hard to reach areas during security sweeps.

 

Benefits & Applications

Client Benefits

  • Detection of Concealed Electronics: Enables identification of hidden mobile phones, SIM cards, tracking devices, and covert surveillance electronics.
  • Security Gap Coverage: Detects electronic devices that do not transmit signals and cannot be located using traditional RF detection equipment.
  • Improved Contraband Control: Supports correctional facilities and security organizations in locating unauthorized communication devices.
  • Rapid Inspection Capability: Portable handheld design allows quick scanning of rooms, furniture, infrastructure cavities, and vehicles.
  • Operational Flexibility: Lightweight device enables inspections in confined or difficult to access areas.
  • Reduced Training Requirements: Simple interface and clear feedback indicators support fast operator training and deployment.

Use Cases

  • Correctional Facility Inspections: Detection of hidden mobile phones, SIM cards, and electronic contraband in prison cells and inmate areas. 
  • Technical Surveillance Countermeasures: Identification of covert microphones, tracking devices, and hidden surveillance electronics in buildings and sensitive facilities.
  • Vehicle and Transport Inspections: Detection of concealed electronics in transport vehicles, transfer units, and holding areas.
  • Security Facility Sweeps: Routine or random inspection sweeps across secured areas to locate unauthorized electronic devices.
  • Law Enforcement Operations: Support for tactical searches, investigations, and counter surveillance operations.

Integration & Compatibility

  • Inspection Protocol Integration: Can be integrated into routine security sweep procedures within correctional facilities and secure buildings.
  • Portable Security Equipment: Compatible with mobile inspection kits used by law enforcement and correctional officers.
  • Layered Security Systems: Complements other security technologies including RF detectors, metal detectors, and physical search procedures.

Deployment Options

  • Handheld Inspection Operations: Designed for portable use during facility sweeps and inspection operations.
  • Mobile Inspection Teams: Easily carried within tactical kits for rapid deployment during security operations.
  • Routine Facility Sweeps: Supports daily or random inspections of prison cells, infrastructure spaces, and operational areas.
  • Entry and Exit Security Checks: Can be used during inmate transfers, frisking procedures, and security checkpoints.

Technical Specifications

  • Detection Range:  SIM Card: 80–110 mm / Mobile Phone: 170–270 mm
  • Transmitter:  2.4 GHz pulsed signal (EIRP < 500 mW)
  • Receivers:    2nd harmonic (4.8 GHz) / 3rd harmonic (7.2 GHz)
  • Harmonic Sensitivity: -135 dBm
  • Antenna: Circularly polarized helical
  • Alarms:  Display, buzzer, headphones
  • Power Supply:  2x Li-ion / LiFePO4 AA rechargeable batteries
  • Charging:  Internal
  • Weight:  350 g main unit + 120 g telescopic handle
  • Dimensions:  150 × 150 × 80 mm
  • Operating Time: Up to 4 hours
  • Operating Temperature:  +5°C to +40°C
  • Storage Temperature:  -10°C to +50°C

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