EDD-24T - Handheld Non Linear Junction Detector (NLJD)

EDD-24T is a Handheld Non Linear Junction Detector (NLJD). It detects all types of electronics - whether active, passive or even switched off.

The EDD-24T is a compact handheld Non Linear Junction Detector or NLJD. It will detect the presence of semiconductor circuits that are used in all modern electronic devices such as mobile phones, tracking devices, listening devices, covert cameras, digital voice recorders, SIM cards etc. Importantly, the EDD-24T will detect such devices whether they are switched on and in use, powered on but in standby mode, or even switched off without any power.

 

Principle of operation
Semiconductor Electronics are used in all modern electronics and are made using Silicon substrates. When high frequency radio signals are transmitted directly over silicon it produces a strong second harmonic frequency of that radio signal. Other materials such as some bi-metals or oxidised metals can respond with a third harmonic signal.
The EDD-24T transmits a focused directional signal on 2.4 GHz (ISM Band Type B). It receives on 4.8GHz (Second Harmonic) and 7.2GHz (Third Harmonic).
The highly sensitive receiver will respond to any signals produced on the 2nd Harmonic by even the smallest piece of Silicon such as that used in SIM Cards, Mobile Phones, Bugging Devices, Voice Recorders, Covert Video cameras etc. Importantly those devices do not have to be in use, in standby or even have any power connected to them to be detected.
The 3rd Harmonic receiver acts as a valuable confirmation for signals that may be ambiguous or are not a threat such as those in oxidised metals, bi-metals etc.

 

Probability Indicator
To allow even an inexperienced user to make a quick assessment of a detected signal the EDD-24T uses an intelligent algorithm to analyse the detected signals from both the 2nd and 3rd Harmonic Receivers and evaluate the probability of material being detected as ‘Silicon’ or ‘Metal’.

Audio Confirmation
The EDD-24T Can provide audio confirmation of detected signals in two ways, through the internal loudspeaker or earphones.
TONE Mode can be used to provide an audible tone of a detected signal on the 2nd Harmonic only. This enables the user to search without looking at the display screen. The TONE changes in pitch according to the strength of the detected signal.
DEMOD Mode can be used to listen to an actual demodulated signal of the 2nd Harmonic Receiver. When no signals are detected a random audible ‘Click’ sound will be heard. In some cases when Silicon is detected the click level will reduce or become completely silent.
The EDD-24T is genuinely portable for handheld use and weighs just 750g. It is encased in a machined aluminium enclosure for ultimate durability with a tough plastic antenna cover. The internal Lithium Polymer battery pack gives up to 4.5 hours of use from one charge. The whole package is supplied in a compact military standard carry case for ultimate protection and portability.
The EDD-24T is designed, manufactured and tested in England to highest technical standards.

 

Technical Specifications
Transmit Frequency	2.400 GHZ to 2.425 GHz (ISM Band Type B)
Transmit Power Level	Up to +30dBm (1 Watt)
Radiated Power Antenna	Up to +36dBm (4 Watts) within allowable limits of ISM band (Type B)
Display	3.5 inch Colour TFT Daylight Readable
Receiver Sensitivity	Better than -120dBm on 2nd and 3rd harmonics
Receiver Bandwidth	Approx 10KHz
Battery	3.7V Lithium Polymer Internal rechargeable
Battery Life	4.5 Hours (Minimum TX Power) 2.0 Hours (Maximum TX Power)
DC Charge	Micro USB Socket 5V 1A
Charger	Input 110/220V Auto-switching - International Adaptors
Output	5V DC 2A
Audio	Internal Loudspeaker or via 3.5mm Earphone Socket
Operating Temperature	0 to +40 degrees C
Enclosure	Machined Aluminium Enclosure with Plastic Antenna Cover
Weight	Main Unit 700g with Carry Case 2.0kg
Dimensions,mm	225x118x51
Carry Case	Military Standard 321mm x 229mm x 111mm

EDD-24T Non-Linear Junction Detector (NLJD): Detect Hidden Electronics Even When Powered Off

The EDD-24T Non-Linear Junction Detector (NLJD) is a compact, professional-grade handheld device that locates concealed electronics without needing them to be powered on. This makes it an essential tool for Technical Surveillance Counter Measures (TSCM) operations, counter-surveillance, and security professionals.

Why the EDD-24T NLJD Excels at Finding Hidden Devices

Modern electronics contain semiconductor components that the EDD-24T can reliably detect, regardless of the device’s power status. Whether the target is active, in standby, or completely powered down, the EDD-24T identifies hidden threats effectively.

It detects a wide range of covert electronics, including:

• Mobile phones and SIM cards
• GPS tracking devices
• Covert cameras (hidden cameras / spy cameras)
• Listening devices and bugs
• Digital voice recorders
• Other unauthorized electronic surveillance equipment

Key Benefits for TSCM Professionals

• Power-off detection capability – Finds devices that traditional RF detectors might miss
• Compact & handheld – Easy to use during sweeps and rapid deployments
• High sensitivity – Designed specifically for professional TSCM and counter-espionage work
• Reliable performance – Helps security teams, private investigators, and government operators uncover hidden electronics quickly and confidently

Whether you're conducting a TSCM sweep, performing a bug sweep, or securing sensitive environments, the EDD-24T Non-Linear Junction Detector provides the advanced detection capability needed to stay ahead of evolving surveillance threats.

Detect hidden electronics — powered on or off — with the EDD-24T NLJD