Non-Linear Junction Detection (NLJD)

Non-Linear Junction Detection (NLJD) helps our technical team locate spycams and other bugging devices even when they are turned off, and even if the batteries are dead. This non-destructive detection technique sees through solid objects. This eliminates the intrusive disruption a physical search sometimes requires, like checking shelves full of books. More importantly, the NLJD speeds up the detection process dramatically. Speed allows us sweep your location expeditiously. It also allows our services to be more cost-effective for you.

TSCM technology NLJD Non-linear Junction Detection

Non-linear Junction Detector (NLJD)

NLJD operates somewhat like the shoplifting detectors used by retailers. There, antennas near the doorways listen for a reflected signal from a shoplifting tag attached to an item. Interestingly, shoplifting tags do not contain batteries. They are simple devices that only contain an antenna and a diode.

Diodes are made from two dissimilar metals fused together. This creates what is called a non-linear junction. Transistors are made the same way. Non-linear junctions are the building block of all modern electronic devices, including bugs, recorders and spycams.

When non-linear junctions are exposed to a strong radio signal, they reflect some of the original signal at twice the frequency! This phenomena allows large areas to be scanned quickly in pursuit of the altered signal. The actual process is similar sweeping a room with a flashlight beam. With the proper training and practice, technical investigators can use these sweeps to detect and locate the origin of all re-radiated signals.

It is also excellent at finding lost remote controls; very much appreciated when we inspect our client’s residences.

Have a Question About TSCM?

If you have any questions about Non-Linear Junction Detection (NLJD) or the TSCM services provided by Murray Associates, simply fill out the form below, or call us from a safe area and phone.

If you think you are under active electronic surveillance, or believe you have discovered a bug or covert video camera, go to our Emergency TSCM page. The procedural checklist there will tell you exactly what you need to do next.