ST 300 SPIDER Line Analyzer, detection of eavesdropping devices


Height 175 mm
Width 83 mm
Thickness 36 mm
Weight 375 g
Power supply rechargeable battery
Modifications In stock in Qty Buy
USA Russia

Select modifications

ST 300 SPIDER - wired communications analyzer

Wired communications analyzer ST 300 SPIDER is designed to detect and locate eavesdropping devices, galvanically connected to power and low-current wire lines in the inspected object. The analyzer uses both passive and active modes of operations. This allows detecting eavesdropping devices which are in active or in stand-by mode at the time of a sweep operation.


In ST 300 SPIDER there are set of functions implemented, which are most necessary for the detection and localization of wired eavesdropping devices.
These functions include:

• Detection and evaluation of low-frequency signals in low-current conductive lines;
• Activation of electret cable microphones by filing an in-line bias voltage;
• Detection of eavesdropping devices signals, which are transmitting information via power and low-current lines in the frequency range from 100 kHz to 150 MHz;
• Detection and assessment of unauthorized galvanic connections to conductive lines using methods of non-linear junction detection and reflectometry;
• Tracking wire lines laid in walls and other building structures using trace locator.
Use of automated mode of analyzer, in combination with electronic switch, allows to carry out various kinds of measurements on all the possible combinations of pairs of multi-wire cable in a few seconds. Adapters, couplers and cables, which are included in the set of ST 300 SPIDER delivery set, allows to connect the device to the most common types of wired lines. The device can be used in standalone mode or controlled from a personal computer.

Modes of operation

The solution of different ways to detect wired eavesdropping devices is ensured by the multifunctionality of ST 300, appropriate accessory pack and the use of passive and active modes of operation.
Systems technical and programming basis, implemented in the structure and unique algorithms allows to use it in the following modes:
• Electronic switch;
• Low frequency amplifier;
• Wireline receiver;
• Nonlinear junction detector for wire lines;
• Reflectometer;
• Trace locator.

Switching ST 300 in any of these modes is carried out compulsorily as at the same time the device can only operate in one of the main modes.

Low frequency Amplifier
Frequency range, Hz 20....25 000
Input impedance, Ohm 200
Amplification regulation range, dB 0....60
Maximum signal amplitude on the entrance, V +/-13,8
Spectral density of voltage noise nV,Hz  3
Bias voltage range, V +/-26
Signal presentation form oscillograph, spectrogram

Wireline receiver
Frequency range, kHz  100....150 000
Time to scan the entire range, S  2
The minimum detectable signal level, dBm  -50....-75
Dynamic range, dB  55
Input impedance, Ohm  50
Demodulation  AM, FM
The filter bandwidth, kHz  80
The maximum allowable voltage In 250(AC), 80(DС)
The presentation of information spectrogram, oscillograph, table

Non linear junction detector
Signal Amplitude, V 0....13
Signal frequency, Hz 45....55
Split indication of even and odd harmonicas present
Minimally detected level of non linear distortions, dB -60

Diapason of distance, m 0...100
Measurement error percentage, % +/-1
Possibility of operation in lines with voltage no

Digital Voltmeter
Measurement range DC, V +/-80
The measurement range AC, V 13
Frequency range, Hz 0....30 000

Trace locator
Carrier frequency of the test signal, kHz 100
Frequency of modulation of the signal, kHz 1...2
Signal amplitude, V 13
Indication Light, sound
Possibility of the contact connection to the line Yes

Power Supply
Built-in Li-pol accumulator with voltage, V 3,7
Consumed power, V 1,2....2,5
Time of continuous operation at maximum consumed power, hour >7
Charging time of fully charged accumulator, hour 7

Dimensions of the main unit (length, width, height), mm 175х83х36
Weight of the main unit, kg 0,375
Package dimensions (length, width, height), mm 390х310х170
Weight of the set in the package, kg 4,4

Height 175 mm
Width 83 mm
Thickness 36 mm
Weight 375 g
Power supply rechargeable battery
Indication of operation light, sound
Battery life at least 7 hours
Battery charging time 7 hours

Delivery set:

Delivery set:


1 – USB cable for connecting ST300 to a laptop - 1 pc.
2 – cable for telephone junction-box testing - 1 pc.
3 – cable for connecting the electronic switch to RJ45 sockets - 1 pc.
4 – cable for connecting the electronic switch to twin wire low voltage lines - 1 pc.
5 – probe for the cable locator receiver - 1 pc.
6 – cable for testing power mains equipped with electric sockets - 1 pc.
7 – tester screwdriver - 1 pc.
8 – cable for connecting the electronic switch to telephone sockets - 1 pc.
9 – charger - 1 pc.
10 – ST300 main unit - 1 pc.
11 – flashcard with software and documentation - 1 pc.
12 – crocodile clamp - 2 pcs.
13 – mains adaptor - 1 pc.
14 – cable for the test sound player - 1 pc.
15 – test sound player - 1 pc.
16 – electronic switch  - 1 pc.
17 – receiver of the cable locator - 1 pc.
18 – accumulator batteries for the cable locator receiver (ААА) - 2 pcs.
19 – headphones - 1 pc.
20 – pass-through socket (RJ45) - 1 pc.
21 – splitter (RJ45) - 1 pc.
22 – splitter (RJ12) - 1 pc.
23 – short-circuiter socket (RJ45) - 1 pc.
24 – telescopic arm of the cable locator receiver - 1 pc.
25 – multiwire cable connector (with a screwdriver)  - 1 pc.
26 – ground connection cable - 1 pc.
27 – device passport - 1 pc.
28 – protective case with custom panels - 1 pc.

Please note: software upgrade can cause recorder’s breakdown. This is not a warranty case. All the new recorders have the latest software version and there is no necessity to upgrade software after buying the recorder. Don’t take the risk. In case there are problems with audio recorder operation please apply to our technical support specialist:

Software Firmware Manual to
Series manual Supplement to the model
ST 300 SPIDER User Manual Catalogue file
Return to reviews