OPERATING MANUAL
57
Disconnect all devices from the line.
Connect the line to be tested to the Electronic Switch (according to the cable type).
Turn on ST300 and go to the Start Menu (2.1 – 2.2).
Go to the main screen of the “SWITCH” mode (“F4” button).
Activate the “CABLE LOCATOR” mode (“FUNC” button).
Set the contact number to apply the test signal through, bearing in mind which contacts of the
Electronic Switch are currently enabled.
Insert batteries into the Receiver of the Cable Locator.
Connect the plug of the Probe (5, Fig.1) into the socket (1, Fig.5) on the Receiver.
Turn on the Receiver of the Cable Locator by pressing and holding down “POWER” (2, Fig.5).
With the “GAIN” button (5, Fig.5) set the sensitivity to a minimum, indicated by one green LED (4,
Fig.5).
At the other end of the cable, where it connects to the terminal or junction box, test one by one all
the contacts, touching those with the Probe (5, Fig.1).
If the test two-tone signal can be heard from the speaker when a contact is touched, that contact is
probably the one you are looking for. Please bear in mind, however, that the test signal can be induced
on other wires of the cable, and thus be heard when other contacts are touched. In this case, find the
contact where it is the loudest.
If need be, all the connections of the cable to the terminal can be found as described above.
3.8. LOCATING A DETECTED BUGGING DEVICE
Object of Search:
finding the exact locations of eavesdropping electronics detected in the following modes,
“LOW FREQUENCY AMPLIFIER”
“WIRED RECEIVER”
“NONLINEAR JUNCTION DETECTOR”
“REFLECTОMETER”
If the detected transmissions from a bugging device are not encoded (sounds of the surrounding area
can be heard from the headphones), the location of the device can be determined with the aid of the Test
Sound Player (15, Fig.1) supplied with ST300. This method is called “acoustic search”.
If one is looking for a bugging device sending encoded transmissions, or the device has been detected
not due to its transmissions, but in the “NL” or “REF” mode, the method to use is non-linear junction
location. However, unlike most situations when a nonlinear junction detector is used, the sought object is
not just a device that contains semiconductor parts, but one electrically connected to the cable. For this
reason, alongside an NLJD, the ST300 must also be used.
3.8.1. Locating a Detected Bugging Device with Test Sound (Acoustic Method)
Let us assume that transmissions of an eavesdropping device have been detected in a line, and that
their source is obviously planted in the room where the search is being carried out, because there is an
established correlation between the sound output and the test sound from the Player. Now one needs to
find the bugging device using the acoustic method.
PROCEDURE
For the above task, two members of the search team will be needed, one of them to move the Test
Sound Player around the room, and the other to monitor the signal strength with ST300.