The modification of the RAKSA 120 selective field indicator is designed to detect radio transmitters that are used to secretly collect audio and video information. Working with this indicator does not require any special professional training.

It is available in two versions:

1. Local (for the domestic market) - RAKSA-121
   Export RAKSA-Idet
   The RAKSA-121 field indicator allows you to detect:

• GSM, UMTS (3G), LTE (4G) cellular phones DECT
• wireless phones Bluetooth and Wi-Fi
• devices wireless video cameras
• analog modulated (AM, FM, FM)
• radio transmitters with digital modulation and continuous carrier (FSK, PSK, etc.)
• broadband modulated radio transmitters with a band up to 10 MHz

  
  

  According to the principle of operation, the RAKSA-121 selective field indicator is a high-speed superheterodyne receiver with a low frequency and a frequency synthesizer. The cycle time for scanning and analyzing all digital and analog signals does not exceed 3 seconds. The RAKSA-121 field indicator can operate in security, review, search, spectrum subtraction, and digital signal monitoring modes.
  
  

The interface languages for the export version are English, German, French, Italian, Spanish, Polish, Czech.

DISTINCTIVE FEATURES OF THE RAKSA 121 FIELD INDICATOR

• selective reception of radio
• signals high scanning and analysis speed
• detection of broadband and digital signals
• adaptation to the background in security mode
• the possibility of spectrum search with subtraction
• audio monitoring of signals
• measurement of signal frequency and level alarm
• event log
• silent alarm indication (vibration alarm)
• no external antenna
• 
  SEARCH MODE

The search mode is designed to detect and locate analog and digital radio transmitters. The display shows the signal with the maximum level. This mode is used in cases where it is possible to move the field indicator to search for a radio transmitter.

In the search mode for the analog signal, a light and sound indication of the relative signal level is implemented – by the frequency of repetition of LED flashes, it is possible to judge the approach or distance from the radio transmitter.

РЕЖИМ ОХРАНЫ

 

The security mode is designed for continuous monitoring of detected analog and digital radio signals in automatic mode (without operator involvement) and alarm in case of a dangerous radio signal, i.e. a radio signal with a level exceeding a set threshold. The security mode is used in cases where the source of the dangerous radio signal is initially absent or inactive. Information about alarm events is saved in the log.

 

In the guard mode, the background spectrum is subtracted for analog signals. This reduces the impact of stationary (constantly present) interfering signals and interference. The background spectrum adaptation algorithm tracks slow changes in the levels of these interfering signals.

РЕЖИМ ОБЗОРА

 

The overview mode is designed to detect analog and digital radio signals of all types. In this mode, the display shows a list of all currently detected signals, sorted by frequency or signal type.

SPECTRUM SUBTRACTION SEARCH MODE

The spectrum subtraction search mode is designed to detect and locate analog radio transmitters. Using this mode has advantages over the usual search mode if the radio transmitter is located in the same room.

In the spectrum subtraction search mode, it is not the absolute level of analog signals that is determined, but the relative level – its difference from the base spectrum, which was measured at the beginning of operation in this mode. It is known that when approaching or moving away from a radio transmitter located indoors, the signal level changes more strongly than a radio transmitter located outdoors. Since in the spectrum subtraction search mode, the field indicator selectively reacts to level changes, local radio transmitters are more likely to be detected.

In the search mode with spectrum subtraction, light and sound indication of the relative signal level is implemented.

АУДИОКОНТРОЛЬ

Audio monitoring of analog signals is possible in the viewing, search and spectrum subtraction modes. During audio monitoring, amplitude-modulated signals are listened to through the built-in speaker. The use of audio monitoring in some cases facilitates the identification of signals and allows the use of "acoustic coupling". 

ALARM EVENT LOG

The alarm event log stores information about dangerous radio signals that were detected in the security mode. The maximum number of entries is 200. If different types of dangerous signals are detected simultaneously, information about each of them is stored in the log. When viewing the recording, the display shows the time of the appearance and disappearance of the signal, its type and maximum level.

 

DIGITAL SIGNAL MONITORING

The digital signal monitoring mode is designed to detect signals from GSM, UMTS (3G), LTE (4G) cell phones, DECT wireless phones, Bluetooth devices, and Wi-Fi. In digital signal monitoring mode, the display shows a list of all digital signals and their detected levels.