Selcom ST 400 Cayman Bedienungsanleitung
NONLINEAR JUNCTION DETECTOR
ST 400 (402)
‘CAYMAN’
OPERATING MANUAL
English
OPERATING MANUAL
22
CONTENTS
pg.
1. Description 23
1.1. Purpose 23
1.2. Delivery package 23
1.3. Main Technical Specications 24
1.4. Principles of Operation 24
1.5. Operation Modes 25
1.6. Structure 25
1.6.1. Antenna Module 26
1.6.2. Main Unit 27
1.6.3. Telescopic Arm 27
1.6.4. Controls 28
2. Use 28
2.1. Preparation 28
2.2. Adaptive Mode 29
2.3. Operational check with test dummies 30
2.4. SEARCH Mode 30
2.5. Listening (Audio Mode) 32
2.6. Program Updates 34
3. Electric Power Supply 35
4. Operating Restrictions 35
5. Storage and Transportation 36
6. Warranty 36
ST 402 ‘CAYMAN’ NLJD
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This operating manual contains important technical information and guidance on proper use
of the product. Please read the manual before using ST 402 Cayman.
1. Description
1.1. Purpose
ST 400 Cayman is intended to detect and locate
• eavesdropping electronics
• mobile phones and SIM cards
• any other devices utilising semiconductor technology
ST 402 Cayman allows detecting electronic devices, whether active or not, as well as
finding their exact location. It also enables one to distinguish between return signals from real
semiconductors and other kinds of responses, such as those given by corrosion or metal-oxide-
metal structures.
1.2. Delivery package
ST 400 Cayman comes in a shockproof case that contains the following.
*The electric charger and headphones are lodged at the bottom, underneath the device.
Item Quantity No. in Fig. 1
ST 402 ‘Cayman’ NLJD 1 2
Accumulator Battery (type 18650) 23
Charger Power Adapter 14
Electric Charger 15*
Headphones 16*
Semiconductor Imitating Dummy (marked red) 1 1
MOM-Structure Imitating Dummy (marked blue) 1 1
Operating Manual 1not shown in g.
Case 1not shown in g.
Fig. 1
1.3. Main Technical Specications
Range of radiated frequencies 2–3GHz
Max. peak radiated power < 2W
Antenna polarisation elliptic
Operation modes SEARCH
AUDIO
ADAPT
Sensitivity range in manual mode 40dB (5 values with 8dB increment)
Response indication
– visual three 16-segment LED gauge bars
– aural internal speaker or headphones
Power supply two 3.7V rechargeable Li-ion batteries
(type 18650)
Time of operation on one battery charge 3-4 hours, depending on the operation mode
Battery charging time < 3 hours
Operating conditions
– working temperature range +5...+40°С
– relative air humidity up to 85 percent (at 25°С)
Weight (with batteries) 1,75kg
Dimensions (length×width×height)
– when folded 510х145х130mm
– with telescopic arm pulled out completely 1500х250х130mm
Weight of full set in case 5,8kg
1.4. Principles of Operation
ST 402 Cayman is a nonlinear junction detector, or NLJD. Instruments of this type employ
active detection, i.e. they emit probing signals and analyse the return. Their primary search targets
are electronic devices, and those typically consist of circuit plates with conductive elements and
various semiconductor parts connected to them, such as diodes, transistors, and microchips.
The probing electromagnetic radiation induces variable electromotive forces in these loops, and
electronic components with a non-linear current-voltage curve transform the initial signal into its
higher frequency harmonics, which come back to the NLJD’s receiver.
Higher harmonics can also be re-radiated by corroded metal or the so-called MOM-diodes,
metal-oxide-metal structures brought about by contacting metal surfaces. However, these
formations return somewhat different spectra than semiconductors.
With ST 402 Cayman one can distinguish with high probability between responses given by
real semiconductors, and those ‘faked’ by MOM-structures or corrosion. Another important
advantage is a condent detection of search targets behind partially shielding obstacles, which is
achieved by simultaneously radiating several frequencies within the 2-3GHz band and analysing
the composite picture of the reection spectrum.
OPERATING MANUAL
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1.5. Operation Modes
The NLJD ST 402 Cayman has the following modes of operation:
Primary operation mode: SEARCH
Secondary operation mode: AUDIO
Service mode: ADAPT
The main operation mode named SEARCH is meant for detecting nonlinear targets and
identifying them, based on the response levels as indicated by 16-segment bars.
The auxiliary operation mode named AUDIO allows demodulating the response and listening
to it through the built-in speaker or headphones. Use this mode upon detecting a response in the
SEARCH mode.
The ADAPT service mode is used to optimise the parameters in a given electromagnetic
environment and thus maximise the effectiveness of search. Engaging this mode is necessary
every time the device is switched on. It is advisable to pause during searches from time to time,
to repeat this procedure. During adaptation, the antenna must be pointed away from electronics
and large metal objects.
1.6. Structure
Structurally, the ST 402 Cayman NLJD consists of the main unit and antenna module, that
are connected with a telescopic arm. The main constituents are shown in Fig. 2.
The numbers in Fig. 2 stand for:
1 – antenna module
2 – main unit
3 – battery compartment
4 – battery compartment cap
5 – handle
6 – antenna module bracket
7 – lever handle of the clamp
8 – power-and-control cable with plug
9 – cam clamps of the telescopic arm
10 – telescopic arm
Fig. 2
11 – headphone socket
12 – power and volume knob
13 – ID plate
14 – inbuilt speaker
15 – controls
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OPERATING MANUAL
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1.6.1. Antenna module
The antenna module comprises a receiver-
transmitter unit, a control-display unit, and an aerial,
all of which are assembled on a single platform
and incorporated in a single body. The antenna is
mounted at the end of a telescopic arm by way of a
hinge joint that allows adjusting the incline within
the vertical plane along the rod’s axis, as shown in
Fig. 3. To change the incline, unlock the clamp by
turning its handle counter-clockwise, as shown in
Fig. 3, then adjust and lock by turning the clamp
handle in the clockwise direction.
Fig. 3
Do not try to change the antenna incline with the clamp locked: you may break the hinge
joint!
Fig. 4
On the antenna surface facing the operator, there are an indicator panel, a socket for the
power-and-control cable, and a USB port for computer connection (Fig. 4).
The numbers in Fig. 4 stand for the following:
# in Fig. 4 description colour subscript on
indicator panel
116-segment led gauge of threat-type response
levels
red 1
216-segment led gauge of MOM-type
response levels
blue 2
ST 402 ‘CAYMAN’ NLJD
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3 16-segment led gauge of reection levels white 3
4 Power-on led indicator red POWER
5 SEARCH mode indicator yellow SEARCH
6 AUDIO mode indicator yellow AUDIO
75-segment tuning bar* yellow TUNING
8socket for power-and-control cable CONTROL
9USB port USB
* the TUNING segment bar has two functions:
– in the SEARCH mode, it shows the selected sensitivity of the receiver (SEN)
– in the AUDIO mode, it shows the selected frequency combination (CH 1..5)
The boresight directions of the receiving and transmitting antennas are shown in Fig. 5.
Fig. 5
1.6.2. Main Unit
The main unit of ST 402 Cayman is housed in a durable plastic body (2, Fig. 2) fitted on top
with a handle (5, Fig. 2) with three control buttons (15, Fig. 2). It has a battery compartment (3,
Fig. 2) for two type 18650 accumulator batteries, closed with a metal cap (4, Fig. 2). On the left
side of the main unit are a headphone socket (11, Fig. 2) and a power-and-volume knob (12,
Fig.2), and on the right side there is a shield bearing the name of the device, its serial number,
and the name of its manufacturer company (13, Fig. 2). Also on the right, a speaker grid can be
found (14, Fig. 2).
The main unit’s body hosts electronics controlling the device. For durability’s sake, all the
components of the main unit are assembled on a single bearing structure made of metal, while the
plastic body only serves protective and aesthetic purposes.
1.6.3. Telescopic Arm
The four-section telescopic arm is used to bring the antenna up close to remote objects under
inspection. Its length can be adjusted with the aid of cam clamps (9, Fig. 2).
Its base section is anchored inside the main unit. The fore section of the rod is tted with
a bracket mount for the antenna module (6, Fig. 2). A lever handle (7, Fig. 2) is used to x the
antenna in a desired position.
OPERATING MANUAL
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A twisted cable goes through the arm, connecting the antenna with the power and control
units housed in the main body. Fig. 6 shows the device with the arm retracted, and fully extended.
Fig. 6
1.6.4. Controls
Three control buttons are at the front of the handle (Fig. 7).
The mode-setting button (2, Fig. 7) is marked with an .
A short press of this button alternates between SEARCH
and AUDIO; holding it down for a few seconds will set the
device to the ADAPT mode.
The other two buttons marked and (1 and 3, Fig. 7)
are for tuning the device. Depending on the mode, they allow:
– in the SEARCH mode, increasing and decreasing the receiver
sensitivity, respectively.
– in the AUDIO mode, setting the desired frequency
combination.
Fig. 7
2. USE
2.1. Preparation
Take the device and rechargeable batteries out of the case. Examine the main unit, antenna, cable
and socket for mechanical damage. Examine the batteries for mechanical damage and electrode
corrosion. Do not use the device if any such defects are found!
To replace the batteries, do the following:
• unscrew the battery compartment cap;
• insert two accumulator batteries as shown in Fig. 8, making sure you observe the polarity;
• screw the cap back in place.
ST 402 ‘CAYMAN’ NLJD
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Make sure the power switch (12, Fig. 2) is in the leftmost position (off). Connect the power-and-
control cable plug (8, Fig. 2) to the socket on antenna module (8, Fig. 4). Switch on the device by
turning the knob clockwise; the device status will be displayed on the antenna module as shown
in Table 1 below.
Table 1
Fig. 8
legend colour light indication interpretation
POWER red continuous The antenna module is powered
properly.
blinking The battery is discharged and needs
to be replaced.
TUNING
SEN
yellow continuous This displays receiver gain. At
startup the gain is automatically set
to maximum, which is signalled by
all the 5 indicator segments being lit.
SEARCH yellow continuous This displays the operating mode.
The SEARCH mode is selected
automatically at startup.
Upon activation of the device one or more LEDs of the signal level gauge bars (1–3, Fig. 4)
may light and go out spontaneously. This would mean that the device should need to be adjusted
to the electromagnetic environment using the adaptive mode.
2.2. Adaptive mode
To activate this mode, press and hold for 3-4 sec the MODE button (2, Fig. 7) on the main unit
control panel. The antenna must be directed away from large metal objects and anything that is
presumed to contain nonlinear elements (it is often best to point the antenna at either the oor or
ceiling).
The adaptation takes 10–15 seconds, with all the indicators but TUNING lit in the meantime on
the antenna module. The TUNING indicator will be showing a consecutive lighting of segments.
Meanwhile, the user can check if any of the indicator LEDs are dead.
Upon adaptation the device status will be displayed in accordance with Table 1.
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2.3. Operational check with test dummies
Once ST 402 Cayman has been adapted to the environment, its functioning should be checked
with the aid of test dummies that imitate nonlinear materials (1, Fig. 1).
For that purpose select an area free of responses from nonlinear elements or reecting
surfaces, and place there the dummy that is marked red.
Press button (3, Fig. 7) repeatedly to set the receiver gain at 3 lit segments of the
TUNING indicator, which corresponds to medium sensitivity.
Point the antenna at the test dummy and nd the distance at which all the 16 segments of the
INPUT LEVEL Gauge bar 1 light up. For a device that is in proper working order and has self-
tuned properly, this distance should be no less than 0.8 m.
Repeat the procedure using the dummy with the blue marking. In doing so, nd the distance
at which all the segments of the INPUT LEVEL gauge bar 2 will be lit. For a properly working
device that has been adjusted to the environment, this distance should be no less than 0.3m.
If either distance is found to be smaller than the respective value above, it is advisable to
engage the self-tuning routine anew (see 2.2) and repeat the checks as described above.
If both distances exceed the required minimums, the device is functional and operation-ready.
2.4. SEARCH Mode
Once ST 402 Cayman has been prepared and proven functional as described above in 2.1 –
2.3, it can be put to use. When activated, the device starts up in SEARCH mode, and the receiver
gain is by default set to maximum, which is displayed by 5 lit segments of the TUNING indicator.
The SEARCH mode is the primary operation mode for ST 400. The operator can change the
receiver gain at his discretion, thus increasing or decreasing the detection range.
The gain can be varied discretely with an 8dB increment, over 5 values in a 40dB range; each
increment corresponds to one LED segment of the TUNING indicator. Thus, if all ve are lit, the
gain is equal to 40dB, providing maximum detection range. If all are dimmed, the gain is 0dB,
with minimum detection range. The gain can be brought a step up or down by a single pressing of
the TUNING buttons or (1 and 3, Fig. 7).
Levels of return signals from a target area are shown in the three INPUT LEVEL multi-
segment LED gauge bars (Fig. 4: 4–6).
INPUT LEVEL led gauge bar 1 (16 red LEDs) displays the levels of return signals from
semiconductor material. The indication is accompanied with an alternating sound alarm.
INPUT LEVEL led gauge bar 2 (16 blue LEDs) displays the levels of return signals from
MOM (metal/oxide/metal) structures.
INPUT LEVEL led gauge bar 3 (16 white LEDs) displays the levels of return signals from
reecting surfaces (most likely, metal).
The greater the response of a certain type, the more LEDs will light up in the corresponding
INPUT LEVEL gauge bar.
Recommendations
With an NLJD one typically probes
• enclosing structures (walls, ceilings, oors)
• different parts of the interior
• various objects that are not supposed to contain semiconductor material
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