ST 154 RF Monitoring System

ST 154 RF Monitoring System

The main purpose of the system is the detection of unauthorized transmission within the supervised area.

These areas include: 

  • Meeting rooms and offices
  • Exam rooms and testing facilities
  • Prisons and correctional facilities
  • Areas with limited use of cell phones, radios, etc.
ST154 detects:
  • RF bugging devices
  • Сell phones and modems (CDMA450, GSM 900, GSM 1800, 3G)*, wireless data transmitters (4G, WLAN, BLUETOOTH 2.4 and 5 GHz), cordless phone systems (DECT) as well as special technical devices using these data transmission standards
  • Analog radio transmitters

*the settings of cellular frequencies, depending on the country and mobile operator, are provided.

Simultaneous monitoring from 1 to 128 local areas. 

No special training required.

Many opportunities for selecting the configuration of the system.

Data transmission over wired (WLAN) and wireless (ETHERNET) networks.


The main unit of the system is the control module (hereinafter CM) which performs the reception and analysis of signals.

Detection area of the CM depends on many factors and the estimated average value is 10 to 50 square meters.

Appearance of illegal signals is displayed by light and sound signaling directly on the CM or transmitted via ETHERNET or WLAN to the checkpoint computer.

The checkpoint computer can be any Windows-compatible desktop computer, laptop or tablet that has been installed special software

Round-the-clock monitoring of radio environment and the event log are provided

In addition, there is the search module (SM) that ensures determination the exact location of the radio transmission device.

  154.А.jpg     154.W.jpg  154.E.jpg
                     ST154.A                                ST154.W              ST154.E/ST154E+POE

it is Possible to manufacture KM in vandal-proof version. Degree of protection IP66.

Modification with 4-way antenna switch

This modification provides the ability to connect antennas, including directional, corresponding to the analyzed frequency range. This allows you to significantly increase the detection range when working in a wide range of frequencies.

Control is carried out from the ST154.NET program
This subsection is intended for tuning the ST154.X(4) antenna switch.
Two switching modes are provided: “Manual” and “Auto”.

In manual mode, the number of the connected input connector of the antenna switch corresponds to the number selected in the software.
When automatic mode is selected automatic serial connection of antennas is provided, depending on the frequency range specified in the settings window.

The СM is composed of:
  • radio-receiving unit with separate highly sensitive circuit for 3G band.
  • transceiver for providing communication via WLAN (ST154.W) or ETHERNET (ST154.E/ST154.E+POE) networks

The surface of the СM has:

  • Connector for power supply 
  • Power switch 
  • SMA connectors for connecting RF antennas.
  • LED alarm.
  • USB connector
  • RJ-45 connector (only for ST154.E/ST154.E+POE)
  • WLAN antenna (only for ST154.W)

Parameters of light and sound alarm are set via the USB port.

                  SM2.jpg         SM.jpg          

The surface of the SM has:

  • charge connector
  • power switch
  • SMA connectors for connecting RF antennas
  • OLED display with receive signal strength indicator (RSSI)
  • USB connector


The minimum configuration consists of the only CM with the light and audible alarm indication (ST154.A). Presetting is performed via the USB port. 

This option is intended primarily for the radio environment control within the one room.


To cover more than one room in a multi-story building is a variant with alarm transmission to a checkpoint computer via WLAN (ST154.W) or ETHERNET  (ST154.E/ST154.E+POE) using a specially created or existing network.

Configuration of the CM can be performed both individually  and for the whole system. Also there are many adjustable options. 
There are special patterns of the ignoring frequencies for the cellular, mobile and wireless data bands.

Each CM is assigned its virtual image that allows to watch changes of the radio emission in the real-time mode.
For convenience, virtual images are placed on the screen, for example, in accordance with the floor plan of the supervised area.

The direction finding mode for localization the source of transmission is available, when using multiple CMs

The silent logging mode is always enabled and there are a lot of options of sorting events depending on criteria you need.
Configuration the ETHERNET and WLAN networks.
Frequency range
50-6000 MHz
Threshold sensitivity, dBm
100, 1000, 2000, 4000, 5000 -100
Maximum input level, dBm
Supply voltage, V 5
Consumption current, mA not more than 500
Dimensions without antenna, mm

1 Control module (ST154.A, ST154.W, ST154.E or ST154.E+POE)*
2 Search module ST154.S**
3 Antenna
4 Power supply 5V 1А
5 Flash drive with software and operation manual
6 USB cable***

* Amount varies depending on the size of controlled area.

** Optional. One per system.

*** One per system