NR-CHP
Operation Manual
4
1. APPLICATION
NR-CHP
Non-linear Junction Detector (fig. 1) is intended for
searching concealed electronic devices that contain semi-conductor
components.
This Detector can be successfully utilized for suspect person
inspection at a certain check point.
NR-CHP
can detect typical target in every operational mode: active,
stand-by or even switched-off.
2. FUNCTION
NR-CHP
represents a portable tool that consists of antenna system,
transmitter and two receivers adjusted for double and triple
frequency of transmitter’s probing signal. Both transmitter and
receivers are placed in a Main unit body.
Main unit is fabricated as mono-block in a compact plastic body with
an easy-to-use handle and control panel on the back side of the body.
The UHF probing signal is converted into a poly-harmonic one on
the radiated nonlinear elements (semi-conductive items or corroded
metal-oxide-metal junction) and retransmitted, better say –
‘scattered’ into ambient space.
Retransmitted 2
nd
& 3
rd
harmonics of the probing signal are received
and processed simultaneously by receivers.
The received signals levels are reproduced in an audio form and its
volume is proportional to the received signal level while its tone
corresponds to an appropriate harmonic.
If necessary the received signals level can be reduced by
ATT
buttons (see Main unit control panel below) and monitored by
corresponding LED indication.