TS-market LORNET-24 User manual

CERTIFICATE
© TS-Market
USER MANUAL
«LORNET-24»
ULTRA-COMPACT
HANDHELD
NON-LINEAR JUNCTION
DETECTOR

2
Contents
USER MANUAL........................................3
1. Introduction..................................................3
2. Specications:.............................................5
3. Delivery set, design and accessories........7
4. Appearance ..................................................8
6. Safety Measures ........................................18
7. Operation Order.........................................18
8. Search Recommendation .........................22
CERTIFICATE.........................................24
1. General .......................................................24
2. Delivery set ................................................25
3. Warranty .....................................................26
4. Importer:.....................................................26
5. Claims Data................................................26

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USER MANUAL
1. Introduction
The non-linear junction detector “LORNET-24”
(further NLJD) is used for search and location of
electronic devices both in active and switch-off
state.
The detector operation is based on the property
of semiconductor components to generate a
response at the 2d and 3d harmonics when
radiated by an RF probing signal. Semiconductor
components of articial origin will have a higher
level second harmonic while semiconductor
components of natural origin (e.g. oxide lms) will
have a higher level third harmonic respectively. An
NLJD analyzes the 2d and 3d harmonics response
of the radiated objects, which enables a quick and
reliable identication of electronic devices and
natural oxide semiconductors.
The NLJD “LORNET-24” automatically nds the
best receiving frequency channel free of noise
and distortion providing awless operation even
in the complicated electromagnetic environment.

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The frequency tuning algorithm implemented in
“LORNET-24” automatically selects the RF probing
signal frequency such that the noise level
in 2d harmonic receiving channel is held minimal,
while digital processing of a demodulated signal
gives maximum sensitivity.
There are two types of radiated signals:
• continuous wave carrier (CW);
• pulse modulated carrier with a duty cycle 4%
(pulse).
This enables to combine wide detection range and
reliable identication of the de-vices found.
The output power automatic control mode
signicantly simplies operator’s work.
“LORNET-24” simultaneously displays the 2d
and 3d harmonics levels at its LED panel. Besides,
the 2d and 3d harmonics levels can be estimated
in turn aurally by the click repetition rate
reproduced through a built-in loudspeaker or
wireless ear-phones.
Detector of the returned RF signal envelope
enables tapping radio microphones and using
the acoustic feedback mode which facilitates
search work.

5
2. Specications:
2.1. Radiated signal types:
• continuous wave carrier;
• pulse modulated carrier with a duty cycle 4%.
2.2. Carrier frequency step 0.2MHz within a tuning
range of (2409.6 … 2410.4)MHz.
Automatic frequency selection. Possibility of
radiation at the carrier frequency with a minimum
noise level in the 2d harmonic receiver path.
2.3. Maximum radiated power in the
CW mode ≤0.5W.
2.4. Peak radiated power in the pulse
mode ≤10W.
2.5. Manual or automatic control of the radiated
power level.
Dynamic control range of 30dB down from the
maximum output power value with 11 level
gradations.

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2.6. Receivers sensitivity better than –140dBW
given a 10dB signal to noise ratio.
2.7. Receivers tuning frequencies equal to the
transmitter double and triple frequencies.
2.8. Receiving path dynamic range ≥ 70dB.
2.9. Time of continuous operation with a lithium-Ion
battery at the maximum radiated power:
• ≥3 hours in the pulse mode;
• ≥1,5 hours in the CW mode;
• unlimited operation time from 220V mains
with a power adapter connected.
2.10. Equipped device weight ≤0.7kg.
2.11. Operating conditions:
• ambient temperature 5…40ºC;
• pressure ≥ 450mm of mercury.

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3. Delivery set, design and accessories
3.1. The device includes units and accessories
stated in the Table below:
Description Q-ty
Receiver-transmitter unit with control
unit and built-in battery container 1
Changeable Li-Ion batteries 2
Container for battery charging 1
Charger for receiver-transmitter unit
(CH1) 1
Wireless accessories including:
receiving device, earphones and
charger (CH2)
1
Technical Description & User
manual, Certicate (in one piece) 1
Package 1

4. Appearance
The appearance of the device is shown in
Fig. 1, where:
1- LED
indicator;
2- ransceiver
antenna unit;
3- control panel
with a power
section and
battery (xed
derneath).
Wireless earphones, chargers and additional
batteries are not shown.
Fig. 1
1
2
3

5. Purpose of the Detector Basic Units
5.1. The transceiver antenna unit with built-in LED
indicators (shown in Fig. 2) is used for:
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3
Fig. 2
• Analysis of distortion and interference in
the instrument receiving path, which is
made each time the detector transmitter is
switched on. Therefore, if an interfering signal
appears during operation (in a complicated
electromagnetic environment) it is necessary
to turn the detector transmitter off and on
from time to time thus selecting an optimal
frequency automatically, which will provide
the best sensitivity as well as detection range
of semiconductor components.
• Generation of CW or pulsed RF signal.

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• Reception and digital processing of the 2nd
and the 3rd frequency harmonics. Simul-
taneous display of the 2nd and the 3rd
harmonics levels gives the opportunity to
dis-tinguish with a high reliability between
signals of articial semiconductors integrated
in electronic devices and natural corrosive
ones which may appear at oxidized junc-tion
points of various metals.
• Demodulation of the 2nd and 3rd harmonics
response, their amplication to the level
required for tapping both by earphones and
a built-in loudspeaker. The amplication is
adjustable within a 20 dB range. The operator
can listen to demodulated signals of the 2nd
and 3rd harmonics in turn.
• Indication of the probing signal levels (1) as
well as of the 2nd (2) and 3rd (3) harmonics
levels (Fig. 2).
5.2 Hinge joint of the transceiver antenna unit
with a knob is designed to transform the unit into
transportation position. (see Fig.3). Besides, it
helps the operator to x the antenna in a position
convenient for search.

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5.3. The control panel is used to control operation
of the detector. It consists of the case combined
with a battery and xed on the arm. The control
board, buttons for operation modes control and
display LEDs are placed in the package. The
control buttons are divided into two groups by their
function: «AUDIO» placed in the upper half of the
panel and «POWER RF» in the lower half. The
control panel is shown in Fig.4
1
2
Fig. 3
Fig. 3: 1- Fixing device; 2- Hinge joint.

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Fig. 4
5
4
3
2
1
6
7
8
9
10

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The following buttons refer to the «AUDIO» group:
1- LEDs and LSTN button for switching of acoustic
indication to the output of the 2nd
or 3rd harmonics.
2- LEDs and OUT button for switching acoustic
output to earphones or a built-in loud-speaker.
3- LEDs and RF button for switching between
types of the radiated signal (CW – conti-nuous,
PULSE – pulsed).
The following buttons refer to the «POWER RF»
group:
4- LEDs and PWR button for switching on/off the
probing signal transmitter. On the switch on the
automatic mode of output power control (AUTO)
is set by default. To switch over to the manual
mode of output power control (MNL) press one
of the LEVEL buttons when a transmitter is
turned on. To return to the automatic mode turn
the transmitter off and then turn it on.
5,6- LED and a button for receiving unit attenuator
control.
7,8- LEVEL buttons for control of radiated signal
power in MNL and AUTO modes (↑ -– high,
↓ – low). It is possible to set the maximum
power level by pressing LEVEL button (↑ – high,
↓ – low) in AUTO mode before the probing
signal transmitter is turned on.

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9,10- Volume buttons for volume control
(↑ – high, ↓ – low). Functions of control panel
indicators: continuous light of any indicator
corresponds to “on” position, absence
of light – to “off” position. Simultaneous
ickering of all indicators on the panel
shows that the battery is discharged and
needs to be replaced.
5.4. On the side surface of the control panel (see
1 in Fig. 5) a slide-type power switch is placed.
A slide position corresponding to «ON» is marked
by a contrast point. Each time before operating
the device it is recommended to fully charge
the battery.
1
Fig. 5

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5.5. Battery charging is to be made with a power
adapter and a battery charger sup-plied with
the instrument only. Using other chargers is not
allowed.
For charging it is necessary to connect
a low-voltage connector of the power adapter
to the socket placed underneath the front side
of the control panel. (see 1 in Fig.6).
A red LED (see 2 in Fig.6) is lighting while
charging (see 2 in Fig.6). When a battery is
completely charged, the red LED goes out,
and a green LED lights up (see 3 in Fig.6).
Charging time of a fully discharged battery does
not exceed 5 hours (typical value is 3.5 h).
1
2
3
Fig. 6

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In case of a failure (charging is not complete within
ve hours) a charger switches off automatically,
both LEDs will go out.
5.6. Wireless telephones consist of a receiving
device and earphones. Appearance of the
receiving device and position of control units are
shown in Fig.7
Device operation order:
• Using a power adapter supplied with the
instrument make sure with a help of the
charge indicator that the battery is completely
charged.
Using of other power adapters is forbidden.
• Connect head phones to the corresponding
socket of the receiving device.
• Turn the receiving device on by a slide-type
switch (control by the turn-on indicator).
• Using volume control set a comfortable
volume level.
• If the receiving device is turned on when
the detector is off, then there is only a noise
signal in the head phones at higher volume.
After turning on acoustic indicator signals
corresponding to the operating mode of the
detector appear in the earphones.

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“ON” indicator
(lights at turn-on)
Charge indicator
(lights during charging)
Socket for phones
connection
Socket for power
adapter
Volume control
Slide-type switch
Fig. 7

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6. Safety Measures
6.1. By requirements of electric safety the detector
corresponds to protection class 1 (according to the
Russian standard).
6.2. The instrument is to be operated only by
persons who have been duly instructed for
safety measures while working with electric and
measuring devices with open RF energy radiators.
7. Operation Order.
7.1. Remove the detector from the package, and
the battery from the protective case, connect the
battery to the detector. After device transportation
at negative temperatures it is necessary to keep the
device in the switch-off state at room temperature
at least 30 minutes.
7.2. To start operation set the battery and turn
«LORNET-24» on by the power switch placed on
the control panel (Fig.5). The 2nd and 3rd indicators
on the control panel will light up, indicating that the

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detector has been powered on.
One yellow LED should be lighting on the antenna
unit (a circle scale of the probing signal power
indicator). Its initial position corresponds to the
maximum power of the probing signal. The probing
signal transmitter is off (it is turned on after pressing
PWR button only).
The 2nd and 3rd harmonics indicators should not
light (ashing of the rst LEDs of the 2nd and 3rd
scales is permitted).
Turn the probing signal transmitter on pressing
PWR button. This will switch on the transmitter
pulse mode and the automatic mode of signal
power control. The radiated signal power will
change depending on a signal level at the 2nd
harmonic receiver in-put. In the given mode sound
information of the 2nd harmonic response is
applied to the loadspeaker or head phones. When
switching on mode 3-RD by pressing LSTN on the
control unit, the output power of the transmitter
is adjusted automatically depending on a signal
level at the 3rd harmonic receiver input. Sound
information of the 3rd harmonic response is apllied
to the loudspeaker or head phones.

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To switch over to the manual mode of the
probing signal power control (MNL indicator
lights up) press one of LEVEL buttons after the
probing signal transmitter has been turned on.
Turn the probing signal transmitter off and then
turn it on for a reverse switch over.
If it is necessary to tap the third harmonic response
turn on mode 3–RD using LSTN button on the
control panel.
During operation in premises with a lot of electronic
devices, you will normally have to decrease
the level of the probing signal by 2-4 points
counterclockwise from the initial position.
The optimum level of the probing signal is reached
experimentally.
7.3. Simultaneous ashing of all indicators on
the control panel indicates that the battery is
discharged and needs to be replaced urgently. In
this case the power should be turned off and the
battery - replaced.
7.4. If a response signal is to be tapped by phones,
switch over acoustic indication to the head phones
mode pressing the corresponding button on the
control panel (see 2 in Fig.4) and turning wireless
phones on (according to their User Manual).