Name: Cayman ST-401 Non-Linear Junction Detector, 2 to 3GHz
Brand: VIMEL
SKU: CAYMAN-ST-401
Price: 17400.0 NZD
Availability: InStock

Cayman ST-401 Non-Linear Junction Detector, 2 to 3GHz

$17,400.00 NZD

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Key Specs

Detection Type

Non-linear junction, harmonic

Frequency Range

2 to 3 GHz

Peak Power

Under 2 W

Display

Three 16 LED bars

Battery

2 x 18650, 3 to 4 hours

Weight

1.3 kg

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Description

The Cayman ST-401 finds electronics by what they are made of rather than what they are doing. It transmits between 2 and 3GHz and reads the harmonics that come back from semiconductor junctions, so a device that is switched off, has a flat battery, or has never transmitted at all still answers.

An elliptic antenna, three operating modes, and manual sensitivity across 40 dB in five 8 dB steps. Three 16 LED bars carry the reading, with a built-in speaker and headphones for audio. Two 18650 cells give three to four hours, the whole thing is 1.3kg, and two test targets ship with it so an operator can confirm the instrument before trusting it.

Features

Finds active and dormant devices: Detects electronics whether powered on or off by reading non-linear harmonic responses.
Material discrimination: Helps differentiate natural semiconductors from artificial structures for fewer false leads.
Controlled sensitivity: Manual adjustment range with step changes supports precise localisation during close searches.
Dual indication: Visual LED bars plus audio monitoring provide clear feedback in noisy or quiet environments.
Field-ready kit: Uses standard rechargeable cells and ships with a shock-proof transport case for protection.

Applications

Real-World Scenarios

Mail And Parcel Screening

A package is a sealed box that nobody can see into and that an RF detector has nothing to say about unless something inside is transmitting.

The NLJD answers whether there is a semiconductor junction in there. That is a different and more useful question at a screening point, and it is why parcel lines use this class of instrument rather than an RF receiver.

A Room Where Visual Inspection Has Run Out

Furniture, wall cavities, skirting, plaster and soft furnishings all hide things that a torch and a mirror will not find.

Work the surfaces at a consistent standoff, watching the three 16 LED bars. Step the sensitivity down 8 dB at a time as the indication rises: each step shortens the effective range and sharpens where the peak actually is.

Confirming The Instrument Before You Trust It

Two test targets ship in the case for a reason.

Checking a known target at the start of an inspection establishes what a genuine response looks like on the day, in that building, at that sensitivity. Without that reference, an ambiguous reading later has nothing to be compared against.

How it Works

Confirm the instrument against one of the supplied test targets so you know what a real semiconductor response looks like at today's settings.
Sweep in Search mode at full sensitivity, watching the three 16 LED bars. Adaptation mode settles the instrument to the site's background.
As the bars rise, step sensitivity down through the 40 dB range in 8 dB increments, and switch to Audio mode with headphones for the last part of the localisation.

Specifications

Frequency Range: 2-3GHz
Maximum Peak Power: Less than 2W
Antenna: Elliptic
Operation Modes: Search, Audio and Adaptation
Sensitivity Adjustment Range(Manual): 40dB (5 Steps of 8dB per adjustment)
Visual Indication: Three 16 LED Bars
Audible Indication: Built-in Speaker, and Headphones
Power Supply: Two 18650 rechargeable lithium ion cells, 3.7V. 18650 is the cell size, not a capacity
Battery-Life: 3-4 Hours (Full Charge - Depending on Operation Mode)
Charge Time: About 3 Hours
Dimensions (portable): 300mm x 250mm x 130mm (L*W*H)
Weight of the Detector: 1.3kg

Frequently Asked Questions

Can it find devices that are switched off?

Yes, and that is the point of the technology. It responds to the non-linear behaviour of semiconductor junctions, which is a property of the components themselves, not of whether they are powered or transmitting.

How do I read the LED bars and the audio?

Rising bar counts and a stronger audio tone mean a stronger harmonic return. Step the sensitivity down as the indication grows, which shortens the range and narrows where the response is coming from.

What are the two test targets for?

Confirming the instrument responds as expected before an inspection, and giving the operator a reference for what a genuine semiconductor response looks like at the settings in use.

How long does it run?

Three to four hours on a full charge depending on mode, on two 18650 lithium ion cells, with about three hours to charge. Four cells ship with it.

What are the three operating modes?

Search for sweeping, Audio for close localisation with the speaker or headphones, and Adaptation for settling the instrument against the site's background before you begin.

Who is this equipment for?

Technical surveillance countermeasures practitioners, corporate security teams and facilities that run their own inspection programmes. A non-linear junction detector is an operator-dependent instrument: results depend on technique, on knowing what a false response from a corroded joint looks like, and on interpreting harmonic ratios. It is not a plug-in-and-scan device.

Does it replace an RF detector?

No, they answer different questions. An RF detector finds what is transmitting now. An NLJD finds semiconductor junctions whether or not anything is powered, which is how a dormant or switched-off device is found. A full sweep uses both.