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Multifunction detection device ST131 PIRANHA-II is intended for detection and localization of special technical means (STM) used for surreptitious obtaining of information, as well as identification of natural and artificial sources of information leakage.

The main types of the STM, for detection of which ST131 is intended, include the following:

The STM with transfer of information by radio channel. Such devices include first of all:
  •  Radio microphones including devices with storage and subsequent transfer of information (burst transmitter) and Frequency Hopping Spread Spectrum (FHSS);
  •  Telephone radio broadcasting devices;
  •  Radio stethoscopes;
  •  Wireless video cameras;
  •  Mobile telephones and modems of CDMA, GSM, UMTS, DECT standards used without authorization;
  •  Devices using digital channels of data transmission of WLAN and BLUETOOTH standards;
  •  Radio beacons for object movement tracking.

The STM that use AC power, telephone, security and fire alarm lines for information transfer.
The STM characterized by information transmission in infra-red range.
The STM characterized by transmission of information in ultrasonic frequency range.


Digita signal processing module
 Simultaneous processing frequency range, MHz  0.01-30 
 Input signal maximal level, dBm  5
 Displayed noise level, dBm  -100 (РС mode), -90 (main unit ST131)
 Resolution ADC, bit 14
 Number of FFT points  32768 (PC mode), 512 (main unit ST 131)
 Filters sizes, МHz 0.001-6.8
 Demodulation types  АМ, FM, SSB, TV (АМ)
 Identified data transfer standards  GSM, WLAN, BLUETOOTH, DECT, UMTS, WiMAX
 Detectors Root-mean-square, peak, quasi-peak

Radio channel
 UHF converter 
 Frequency range, MHz  30-4300 
 Displayed noise level:
 Within the whole bandwidth, dBm 
 Within DDC bandwidth 1 kHz, dBm 

 Input signal maximal level, dBm  5 
 Value of DDC bandwidth, MHz  224, 112, 54, 56, 28, 6.8, 2.5, 0.63, 0.15, 0.075,  0.04, 0.001, 0.0005 
 Sweep speed, GHz/sec, at least 10
 SHF detector
 Frequency range, GHz 4-18
 Threshold sensitivity, W/cm2 2x10-10
 Dynamic range, dB 45
 Type of antenna log-periodic
 Antenna beamwidth, degrees 60-90

Wire line channel
 Frequency range 1 (CH1), MHz  0.01-30 
 Frequency range 2 (CH3), KHz  0.3-15
 Common-mode interference attenuation factor, dB  60 
 Absolute maximum input level, V 250

Optical channel
 Spectral range, nm  770÷1600 (560-1100) 
 Detecting frequency range, KHz  0.1-1500
 Dynamic range, dB 55

Acoustic channel
 Frequency range, KHz  0.01-125 
 Dynamic range, dB 90
 Input signal maximum level, V  1 
 Dimensions of main unit, mm  190x97x50 
 Indication  TFT, 3.5"
 240x320 resolution, 65K colors 
 Interface  USB 2.0 (200 МBit/sec transfer speed) 
 Power supply  6 AA batteries (rechargeable batteries) or
 100-240 VAC, 50-60 Hz 

Delivery set:

Main unit;
UHF converter (ST131.UHF);
Broadband UHF antenna (ST131.UHF.A);
Wire line adapter (ST131.AWL);
Main unit supporting block;
Main unit shoulder holder;
2 power supply units;
8 AA batteries;
CD with software;
User manual.

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
Operation manual for ST 131 PIRANHA-II
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