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Non Linear Junction Detector (Model-NR 900 EM)
The NR 900 EM is designed to detect concealed electronic devices containing semi-conducting components.
The device allows inspection of constructional elements of buildings and furniture etc. in order to detect covert surveillance devices such as 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.
The device allows inspection of constructional elements of buildings and furniture etc. in order to detect covert surveillance devices such as 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.
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OPERATIONAL PRINCIPLE
The electronic devices containing semi-conducting components such as diodes, transisitors, computer chips, etc. react to high frequency signals transmitted by non-linear junction detectors (NLJD) reradiating the energy back on doubled and tripled frequencies of the flooding signal. The response transmitted back from electronic components is received and analysed by the NLJD.
The same effect is also true of some other materials - so called ‘false’ semi conductors. Typical examples of such materials are oxidized metal items and metal to metal contacts.
However, the spectrum of the signal reradiated from electronic components is different from that of “false” semi-conducting items. For example, electronic components return more 2nd harmonic of the flooding signal, but the “false” semi-conductors return more 3rd harmonic.
Using NLJDs for the sepctral analysis of returned signals allows the determination of whether or not the detected target is electronic, even when near other objects with similar properties.
The same effect is also true of some other materials - so called ‘false’ semi conductors. Typical examples of such materials are oxidized metal items and metal to metal contacts.
However, the spectrum of the signal reradiated from electronic components is different from that of “false” semi-conducting items. For example, electronic components return more 2nd harmonic of the flooding signal, but the “false” semi-conductors return more 3rd harmonic.
Using NLJDs for the sepctral analysis of returned signals allows the determination of whether or not the detected target is electronic, even when near other objects with similar properties.
FEATURES
The high energy potential of the detector, output power to receiver sensitivity ratio ~+146 dB, provides for effective detection of electronic devices inside heavy building constructions including on the rear side of reinforced walls.
The device provides a high speed sweeping capability.
The differentiation between electronic devices and ‘false’ targets is available by using the following advanced algorithms provided by the detector : the simultaneous receiving of both 2nd and 3rd harmonics of the flooding signal, the visual and audible indication of the levels of responses and the signal’s curve extraction algorithm.
The very narrow beam antenna allows precision localisation of detected targets.
The device recivers are protected against interference from GSM - 1800 cellular phone signals.
The device provides a high speed sweeping capability.
The differentiation between electronic devices and ‘false’ targets is available by using the following advanced algorithms provided by the detector : the simultaneous receiving of both 2nd and 3rd harmonics of the flooding signal, the visual and audible indication of the levels of responses and the signal’s curve extraction algorithm.
The very narrow beam antenna allows precision localisation of detected targets.
The device recivers are protected against interference from GSM - 1800 cellular phone signals.
| Technology | : | Based on Digital Signal Processing (DSP) |
| Transmitter Frequency Power | : | 860 MHz peak pulse 2W (Average continuous 0,13 W[+21dBm] |
| Modulation | : | amplitude-pulse |
| Receivers | ||
| Sensitivity (with digital processing) Attenuator levels |
: : : |
better than - 132dBm] (At S/N ratio - 6dB) -10, -20, -30, -40, -50 dB |
| Antenna | ||
| Transmitter/Receiver Antenna Polarisation Ellipticity Ratio Gain of transmitting antenna Gain of receiving antenna Main lobe angel Back lobe level |
: : : : : : : |
1. Transmitter : Linear 2. Receiver : Circular not less than 0,75 not less than 6dB not less than 8dB not more than 40degree not more than -20 dB |
| Output | ||
| Audio | : | tone (212 Hz) |
| Display | : | 4 row LCD |
| Dynamic range of signal strength bargraph | : | 30 dB |
| Displayed Data | : | level of 2-nd harmonic (bargraph scale and digital value) level of 3-rd harmonic (bargraph scale and digital value) absolute difference between 2-nd and 3-rd harmonic levels (digital value) current receivers. attenuator value output power status head phone connection status (2-nd or 3-rd harmonics Outputs) GSM protection mode status Battery voltage |
