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+7 (473) 290-00-99

Arinst SFM3 is a portable panoramic electromagnetic field detector with a built-in antenna. It is a modified trident-fed omnidirectional rectangular monopole. The device is designed to search for and localize sources of radio emissions, measure the level of radiation from devices and household devices in the frequency range from 23 MHz to 6.2 GHz. High scanning speed makes it possible to detect impulse signals of digital communication standards: Wi-Fi, 2G, 3G, 4G, LTE, CDMA, DCS, GSM, GPRS, etc. The software demodulator BFM/FM/AM allows you to listen to "suspicious signals" on the subject of information leakage, as well as to localize radio transmitting devices with analog modulation due to acoustic feedback.

How does it work?

The device is built on the basis of superheterodyne transfer of the spectrum to a zero intermediate frequency, contains a high-performance microprocessor that performs digital signal processing. With its help, it was possible to achieve a high scanning speed of up to 20 GHz/s and a frequency resolution of up to 2.5 kHz, as well as implement software demodulation of analog signals. The built-in omnidirectional antenna, coordinated over a wide frequency range, allows you to localize radio sources from a distance of up to 10-20 meters.

Advantages of the field detector ARINST SFM3:

  • Built-in omnidirectional antenna
  • 4" color resistive IPS display
  • Wide frequency range: 23 MHz to 6.2 GHz
  • High scanning speed: up to 20 GHz/s
  • Software demodulator BFM/FM/AM
  • Dynamic range  - more than 80 dB
  • Various signal search modes
  • USB typeC charging
  • Light weight and dimensions: weight 400 g, dimensions 222x81x27 mm
  • Battery life up to 4 hours


Panoramic electromagnetic field detector Arinst SFM3 is not a measuring device, as it does not have an approved type of measuring instrument. Approval of the type of measuring instrument would negatively affect the availability and price of the instrument. However, despite this, the device fully complies with all the declared technical characteristics. The detector is not a full-fledged classical spectrum analyzer, since it does not use a classical frequency conversion scheme for 100% suppression of the image channel. We use mathematical suppression of the image channel, which in some rare cases can lead to the appearance of "phantom" signals in the displayed signals.

Specifications ARINST  SFM3
Scan Options
Frequency range1 ~23 MHz-6200 MHz
Maximum span 6177 MHz
Reference oscillator TXCO GPS 26 MHz
Frequency Resolution 20, 10, 5, 2.5 KHz
Display dynamic range 80 dB
Maximum scan speed2 20 GHz/s
Minimum sweep time of full 6 GHz bandwidth 0.3 s
Antenna characteristics3
Gain at 100 MHz -17 dBi
Width of the main lobe of radiation pattern 90°
Gain at 2450 MHz 2 dBi
Width of the main lobe of radiation pattern 60°
Operating modes
Spectral panorama Display of up to 4 independent ranges, differential operation
Table lookup Display of up to 12 maxima in the analyzed frequency range, differential mode of operation
Range scan Maximum signal display in 12 configurable ranges, difference mode
Searching with tone-guided signal strength Spectrum display in 0.5/1/2/5 MHz band, audio tone proportional to signal level
Demodulation Display of IF spectrum, audio spectrum and demodulated signal waveform
Demodulation types BFM/FM/AM
Functions Automatic gain control, S-meter, threshold squelch
Bands for BFM 400, 300, 200, 100 KHz 
Bands for FM/AM 20, 10, 8, 6, 4 KHz
Audio output Speaker 2 W, Jack 3.5 mm
Screen type touch resistive, IPS
Screen resolution 800*480
Power supply
Built-in battery capacity 5000 mAh
Battery life ~ 4 h
Battery charge time4 ~ 3.5 h
PC connection interface USB type C
Working temperature range 0 … +40°С
Dimensions (L×W×H) 222x81x27 mm
Weight 0,4 kg

1 The exact value of the range is 23.15 MHz - 6199.85 MHz.

2 The measurements are carried out in the "Speed" operating mode and a spectral resolution of 20 kHz.

3 The parameters are for guidance only. The values are given for the radiation pattern in the instrument plane.

4 The power supply must provide an output current of at least 2A.




Dimensions (length , width , height ), mm
222  x   81  x   27 


USB2.0 TYPE-A to TYPE-C cable
Plastic stylus