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

It is available in two versions.:

Local (for the domestic market) - RAKSA-121
Export RAKSA-Idet
The RAKSA-121 field indicator allows you to detect:
GSM, UMTS (3G), LTE (4G) DECT cell phones

wireless phones Bluetooth and Wi-Fi
devices wireless video cameras
with analog modulation (AM, FM, FM)
digitally modulated and continuous carrier radio transmitters (FSK, PSK, etc.)
broadband modulated radio transmitters with a frequency 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 protection, review, search, spectrum subtraction, and digital signal monitoring modes.

The interface languages for the export version are English, German, French, Italian, Spanish, Polish, and 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 (vibration alarm)
there is 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 when you can move the field indicator to search for a radio transmitter.

In the analog signal search mode, 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.

SECURITY MODE

 The safety 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 the set threshold. The security mode is used in cases where the source of a dangerous radio signal is initially absent or inactive. Information about disturbing events is saved in the log.
 
In protection mode, the background spectrum is subtracted for analog signals. This reduces the impact of stationary (constantly present) interference. The background spectrum adaptation algorithm tracks slow changes in the levels of these interferences.
REVIEW MODE

 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 normal search mode if the radio transmitter is located in the same room.

In the spectrum search mode, it is not the absolute level of analog signals that is determined, but the relative level, which differs from the base spectrum that 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 strength changes more than from a radio transmitter located outdoors. Since the field indicator selectively reacts to level changes in the spectrum subtraction search mode, the probability of detecting local radio transmitters is higher.

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

AUDIO MONITORING

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 communication". 

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 saved 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 cordless phones, Bluetooth and Wi-Fi devices. In digital signal monitoring mode, the display shows a list of all digital signals and their detected levels.