SEL SP-44 - active protection system for electric circuit and ground
The device is a technical mean for active information protection for the top-secret category objects. The device provides protection of intercommunication and data transmitting systems that uses single-phase 220V with ground net as an information transmitting channel, from any type of interception devices by generating a wide-range digital noise. SEL SP-44 prevents from information leakage through the power-supply and ground lines providing a masking noise there in the frequency range of 0.01 - 300 MHz. It also suppresses wiretaps which are using these lines as a data-transmitting channel.
ADVANTAGES:
- does not influence PC performance and consumer electronics functioning.
- not sensitive to peaks of net voltage up to 1kV.
- does not interfere with radio reception.
Visual differences between unprotected and protected 220 V electric circuit from information leakage. Protection is done by Active Electric Circuit Noise Generator SEL SP-44. The measurement was done by Multi-purpose Search Device ST-031M "Piranha".
Without SEL SP-44 With SEL SP-44
Channel of data leakage in 220V circuit Protected 220V electric circuit channel
FEATURES:
• Main components of the device - noise generators, noise level controllers and output amplifiers - are fully digital devices. This allows, while maintaining a high quality factor of the noise signal, completely eliminate the posibility of information leakage due to self-excitation, parasitic generation and modulation of dangerous voice signal and electric signals, caused by the electro-acoustic convertors in the circuit elements, and their leakage through the supply lines.
• Uncorrelated noise generators for the circuits "phase" - "earth" and "zero" - "earth" allows to eliminate the possibility of informative signal interception for the anti-phase and in-phase connection schemes.
• The presence of independent noise level controllers for the low and high frequency bands allows to optimize the interference spectrum for electromagnetic compatibility, while maintaining sufficient efficiency of masking noise.
• The device has a high-class resistance to impulse interference and allows continuous operation under the conditions equivalent to a short circuit. Application of core output amplifiers significantly increases the efficiency, reliability and stability of the device parameters, allows it to operate in more severe weather conditions.
• During operation the unit constantly performs a self-test, and in case of failure gives sound and light signal.
• Switching on the device can be done by the button on the control panel of the device or by remote control (optional).
| Characteristics: | |
| Noise frequency range | 0.01 - 300 MHz |
| Lines protected | power supply, ground |
| Spectral-noise density (at 50 Ohm load relatively 1 µV/ √ kHz) in the frequency bands, not less than: | |
| 0.01 - 1 MHz | 90 dB |
| 1 - 10 MHz | 70 dB |
| 10 - 100 MHz | 50 dB |
| 100 - 300 MHz | 35 dB |
| Noise level adjustment range in the frequency bands, not less than: | |
| 0.01 - 0.5 MHz | 20 dB |
| 5 - 300 MHz | 12 dB |
| Quantity of independent noise signal channels ¹ | 2 |
| Noise quality factor | not less than 0,9 |
| Leakage of the current through ground line | not more than 1 mA |
| Noise actuation control | manual, remote, RS-485 |
| Operation conditions: | |
| – operating temperature range | from 0 up to+50 °C |
| – relative humidity at + 25 °C | up to 85% |
| – atmospheric pressure | 750 ± 40 mm Hg |
| Power supply: | |
| – AC mains | 220 V ± 10% 50 Hz |
| – power consumption | not more than 12 W |
| Mass-volume: | |
| – dimensions | 172 х 172 х 42 mm |
| – weight | not more than 1.5 kg |
| ¹ – for phase-to-ground and zero-to-ground circuits | |
Holds the certificates of: Federal Service for Technical and Export Control of Russia (FSTEC) and Sanitary and epidemiological.
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