Non-Linear Junction Detector RFD-23


The portable (hand held) non-linear junction detector RFD-23 is intended for the detection of devices containing semiconductor components.

RFD-23 can detect electronic devices regardless of their conditions, whether they are active (switched on) or passive (switched-off).

It is used to quickly search and examine floors, walls, ceilings, and furniture inside building, outdoors areas, as well as vehicles and means of transportation.

It is used for the detection and localization of hidden technical means used for data interception and transfer (listening devices), remote control devices, and explosive devices containing electronic components.

General information

The operating principle of the RFD-23 detector is based on the property of semi-conducting elements (non-linear junctions) to re-emit second and third harmonics of super high frequency probing signals irradiating them.

Because semi-conductor junctions have non-linear characteristics that differ from those of natural junctions, it is possible to differentiate electronics from the background using the reception of the 2nd and 3rd harmonics of the probing signal. The comparison of the harmonics levels, as well as the mode of extraction of the envelope of the reflected signals allow the operator to identify which signals are reflected from the semi-conducting electronic devices and which signals are from the background of the natural (corrosive) non-linear reflectors.

The adjustable radiation power of the RFD-23 detector makes it possible to efficiently conduct searches for devices hidden in or behind various materials, including building structures and the ground.

The use of pencil-beam antenna system combined with the possibility to adjust the detector’s parameters results in a very accurate localization of the objects during the search operations.

In addition to using the data displayed on the LCD screen, the operator may rely on audio signals from built-in speakers or headphones to define the presence of the second and third harmonics.

Search mode

The search mode includes the following steps:
- the presence of interference is assessed,
- the optimal value of the probing signal power and the receivers’ amplification are selected,
- the search and localization of objects containing semi-conducting elements is performed.

Identification mode

The presence of an artificial or natural non-linearity in the detected object is assessed based on the reflected signal parameters.

Technical characteristics

Distance of assured detection of semi-conducting diode: In open space: not less than 0.7 m
In dug underground:
  a) In dry soil - not less than 0.5 m
  h) In wet soil - not less than 0.2 m
Indication of detection: Visual, audible
Emitting signal frequency: 860 ± 10MHz
Receivers sensitivity (at 10 dB signal / noise ratio): -130 dbm
Receivers dynamic range: Not less than 25dB
Receivers sensitivity adjustment: Five steps of (10±2) dB each
Beam width of main lobe of transmitting and receiving antennas: Not more than 40 degrees
Side lobes suppression for transmitting and receiving antennas: Not less than 20 dB
Pulse power of the emitted signal Equivalent to 0.1 W Continuous
Power supply of the detector: From storage battery 7.2 V
Time of continuous operation: 4 hrs. on single full charge at high/maximum power
Operating temperature range: 0°C ... +40°C
Weight of the detector in operating condition: 2.95 kg
*Weight of the detector in a packing case: not more than 7 kg

* The packing case type can be changed without notice.

Listed above are the standard/draft specifications that can be customized as per the requirement of client.

Download detailed description in PDF.