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NR-µ non-linear junction detector (NLJD)
NR- µ is designed to detect covert electronic devices containing semi-conducting components.
The device allows inspection of light constructional elements of buildings, furniture etc. (in the office area) and detection of covert surveillance devices (radio microphones, microphone amplifiers, tape and digital recorders etc.) in different operational modes: in a transmission mode, switched off or in stand-by mode (for remote controlled devices).
OPERATIONAL PRINCIPLE:
Modern electronic devices usually contain semi-conducting components (diodes, transistors , computer chips etc.) These components react to a high frequency signal transmitted by non-linear junction detectors (NLJD), reradiating the energy back on doubled and tripled frequencies of the flooding signal.
This effect allows effective detection of electronics devices in office areas, inside walls, furniture etc.
FEATURES:
- The lightweight body and built-in cable system between the antenna and transceiver make the device compact and easy to use.
- The advanced technology within the detector, combines the advantages of both pulse and continuous wave based NLJDs.
- The extra antenna head LED display shows the received signal strength for both 2-nd and 3-rd harmonics.
- Frequency adjustment polite high IMC features.
- Telescope rod is highly effective for inspection building constructions and furniture.
| Technical characteristics: |
| Transmitter: |
| Frequency |
848 MHz |
| Power: |
peak pulse 2 W [+33 dBm] |
| sweep mode |
(average continuous 0,4 W [+26 dBm]) |
| signal’s curve extraction mode (20К) |
average continuous 2 W [+33dBm] |
| Control range of output power |
10 dB (step 5 dB) |
| Modulation sweep mode |
amplitude – pulse (duty cycle 5) |
| signal’s curve extraction mode (20К) |
CW |
| Receiver: |
| Frequencies |
1696 MHz / 2544 MHz |
| Sensitivity (with digital processing) |
not less than -162 dBW [-132 dBm] (at S/N ratio - 6 dB) |
| Attenuator levels |
(at S/N ratio - 6 dB) -10, -20, -30, -40 dB |
| Antenna: |
| Polarization |
circular |
| Ellipticity ratio |
not less than 0,75 |
| Gain of transmitting antenna |
not less than +6 dB |
| Gain of receiving antenna |
not less than +8 dB |
| Main lobe angel |
no more than 40° |
| Back lobe level |
no more than -15 dB |
| Output: |
| Audio |
tone (400 Hz) |
| Display |
2х16-dot LED scale (resolution 2,5 dB) |
| Dynamic range of the display |
40 dB |
| Displayed data on the control panel |
- level of 2-nd harmonic;
- level of 3-rd harmonic;
- receivers’ attenuator status;
- output power status;
- headphone connection status (2-nd or 3-rd harmonics’ outputs);
- 20K mode status
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| Displayed data on the antenna head |
- level of 2-nd harmonics;
- level of 3-rd harmonics.
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| Test target: |
| Detection range in open space (in mode with maximum transmitter output power and maximum sensitivity of receivers) |
not less than 0,4 m |
| The location accuracy of the test (in mode with minimum transmitter output power and minimum sensitivity of receiver) |
no worse than 0,1 m |
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