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Selcom Security ST 401 CAYMAN Operating Manual

Portable nonlinear junction detector
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PORTABLE
NONLINEAR JUNCTION DETECTOR
ST 401 CAYMAN
OPERATING MANUAL

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Summary of Contents for Selcom Security ST 401 CAYMAN

  • Page 1 PORTABLE NONLINEAR JUNCTION DETECTOR ST 401 CAYMAN OPERATING MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 1. Description 1.1. Purpose 1.2. Delivery package 1.3. Main Technical Specifications 1.4. Principles of Operation 1.5. Operation Modes 1.6. Structure 1.6.1. Antenna Module 1.6.2. Main Unit 2. Use 2.1. Preparation 2.2. Adaptive Mode 2.3. Operational check with test dummies 2.4.

  • Page 3: Description

    Please read the manual before using ST 400 Cayman. 1. Description 1.1. Purpose ST 401 CAYMAN is intended to detect and locate • eavesdropping electronics • mobile phones and SIM cards • any other devices utilising semiconductor technology ST 401 allows detecting electronic devices, whether active or not, as well as finding their exact location.

  • Page 4: Main Technical Specifications

    1.3. Main Technical Specifications 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 gauges –...

  • Page 5: Principles Of Operation

    1.4. Principles of Operation ST 401 ‘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.

  • Page 6: Structure

    1.6. Structure Structurally, the ST 401 ‘Cayman’ NLJD consists of the antenna module and the main unit connected by way of a hinge joint. The general appearance of ST401 is shown in Fig. 2, the numbers standing for: 1 – antenna module 2 –...
  • Page 7 Fig. 4 On the surface of antenna facing 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...

  • Page 8: Main Unit

    Fig. 5 1.6.2. Main Unit The main unit of ST 401 ‘Cayman’ consists of a battery compartment, a control panel, and mechanical parts that form the bearing structure. The appearance of the main unit and the location of its components are shown in Fig. 6. Fig.

  • Page 9: Use

    A three-button control panel is located in the upper part (Fig. 7). The MODE button (1, Fig. 7) is used to set the operation mode of the device. 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.

  • Page 10: Adaptive Mode

    Make sure the power switch (5, Fig. 6) is in its leftmost position (OFF). Insert the power-and- control cord plug (3, Fig. 6) into the socket (8, Fig. 4) on the antenna module. Activate the device by rotating the knob clockwise. The device status will be displayed on the antenna module as shown in Table 1 below.

  • Page 11: Manual Gain Control

    Repeat the procedure using the dummy with the blue marking. In doing so, find 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.
  • Page 12 When running checks on enclosing structures, it is important to set a suitable receiver gain. If excessive, it may well cause detection of objects behind the walls, which may be a problem when there is no access into the adjoining spaces. On the other hand, if the gain is too small, targets of interest with a weak response may remain undiscovered in the structure under scrutiny.

  • Page 13: Listening (Audio Mode)

    2.5. Listening (AUDIO mode) The AUDIO mode is primarily intended for analysing target responses by listening to the demodulated signal output. This should give the operator ample information to identify the response type. To switch from SEARCH to AUDIO, press MODE. The SEARCH led (5, Fig. 4) on the antenna head will then go off, and AUDIO led will light up (6, Fig.
  • Page 14 Table 3 indication on TUNING bar freq. combination # gauge bar # in SEARCH mode Use buttons to change probing frequency combinations (2 and 3, Fig. 7). Table 4 shows typical results of analysing targets with nonlinear properties. Table 4 Type of probed Optimum frequency Sounds when...

  • Page 15: Program Updates

    3. POWER SUPPLY ST 401 Cayman is powered by two Li-ion rechargeable batteries (type 18650). 4 batteries are included in the delivery package. The total run time on one battery charge is from 3 to 4 hours, depending on the modes employed;...

  • Page 16: Operating Restrictions

    Accumulator batteries can be charged with the charger included in the delivery package. The charging time of a fully discharged battery is 3 hours. As these batteries are free of memory effect, incomplete charging is acceptable, but the running time will then be shorter. The following is not allowed: –...

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