Operating manual
Non-linear junction detector «Katran» with serial № ________________________
complies with technical standards and is ready for usage. The device has passed
integration tests in accordance with testing routine.
Date of manufacturing ___________________ 200
5.1. The warranty period of the device is 12 months from the sale date.
For guarantee service please apply to: Suritel, 5, Usievicha ul., Moscow, 125319,
Russia. Tel/fax: +7(495) 232-33-27, 974-90-77.
5.2. The devices with the traces of mechanical damage, unsealing as well as the
devices used in a wrong way are not subject to warranty reparation
5.3 The warranty comes into force only if the receiver is presented together with the
present manual with producer’s selling mark stamped by its official round seal.
Sold by ______________________
(company name)
Date of Sale “______” _______________ 200___
(personal signature)
1. Introduction.
ЕЛКБ 464415.810
with rechargeable
charging unit
Antenna system
Telescopic rod
with indication
AC mains power
supply unit
Serial №
Power cable
Operating manual
Transport bag
Portable non-linear junction detector SEL SP-61/M “Katran” (hereinafter “the
NLJD”) is designed to detect various kinds of electronic devices, both in turned-on
and turned-off modes.
Principle of its operation is based on the feature of non-linear junctions (NLJs) to radiate 2nd
and 3rd harmonics when flooding with a microwave signal.
The maximal response from semiconductor elements is observed on second harmonics
of probing signal. When radiating of oxidation films, formed by natural way, maximum
response is observed on the third harmonics of probing signal.
Non-linear junction detector "Katran" realizes analyses of responses of irradiated objects
based on the second and the third harmonics of probing signal. This helps in reliable
identification of electronic devices and natural oxide semiconductors.
“Katran” performs search of best response frequency channel, which is free of
interferences, allowing operation of the device even in difficult electromagnetic environment.
Digital processing of signal, used in the device, allows optimizing of signal
processing algorithms and obtaining maximal sensitivity.
There are different types of modulation of fundamental signal in Katran:
- continuous radiation of carrier frequency; (fig.1a);
- frequency modulation of the carrier frequency, FM = 1 kHz (fig.1b);
− - pulse modulation of carrier frequency with on/off time ratio 3, fT = 1 kHz,
τ = 0,3 ms (fig.1c);
Due to this fact there is a possibility not only to detect radio transmitting
devices, but to define their types through listening to them, if an operator has an
Fig. 1a
Fig. 1b
Fig. 1c
“Katran” provides listening of operating radio bugs, including that ones with
protection of transmitted information. “Katran” has an acoustic feedback mode for
easing the search of bugs.
2. Technical characteristics.
2.1. Types of emanated signal:
- continuous radiation of carrier frequency;
- pulse modulation of carrier frequency with on/off time ratio 3, fT = 1 kHz, τ = 0,3 ms;
- frequency modulation of the carrier frequency, FM = 1 kHz.
2.2. Transmitter frequency range is 890 – 895 MHz. Selection in 0.5 MHz steps can be done
automatically in accordance with the minimal noise on the 2nd harmonic of emanated signal.
2.3. Maximum radiated power in uninterrupted radiation mode is not more than 2 W.
2.4. Radiated power is regulated with the help of built-in attenuator with 4 positions:
………………………….……………………………………….….2 W; 0.6 W; 0.16 W; 0.08 W.
2.5. Real sensitivity of receiver ……………………………………..… not worse than -130 dBm.
2.6. The tuning frequencies of receiver equal double and triple frequencies of the transmitter
2.7. Dynamic range of receiving path, not less than …………..………………………..…. 75 dB.
2.8. Time of continuous operation from Li-Ion rechargeable battery ……not less than 2.5 hours.
2.9. Weight:
a) telescopic rod with antenna and cable ………………..……………….….……………. 0.9 kg;
b) receiving-transmitting unit with battery………………………….….….……..…..…….2.2 kg.
2.10. Operational conditions:
- ambient air temperature ………… ………………………..….……………….….…….5÷40 ˚C.
- atmospheric pressure ……………………………………….……..…not less than 450 mm Hg.
3. Structure and accessories.
3.1. The device consists of the units and facilities listed in the table 1.
Table 1.
Receiving - transmitting unit with control panel, charging unit and a strap for
Antenna assembly.
Telescopic rod.
AC power supply unit.
Power supply cable.
Rechargeable battery (located inside receive/transmit unit)
Diagram of the device is shown on Fig. 2
~220 V
Emanated frequency
Types of modulation:
Carrier w/o modulation
FM with deviation
Parameter value
11 specified
within 890
…895 MHz
range, selection
in 0.5 MHz
1.5 kHz
Duration 0.4
ms., on/off time
ratio 3
0,6 W
0,16 W
0,08 W
Sensitivity of receiver:
2nd harmonic
3rd harmonic
-130 dBm
-130 dBm
Not more
Not more
Time of operation
2.5 hours
Not less
Dynamic range of
receiving path
Not less
Temperature range
Specified values of
output power
Fig. 2
1- Control panel;
2- Receiving /transmitting unit;
3- AC power supply unit;
4- Indication unit;
5- Telescopic rod;
6- Antenna assembly;
7- Rechargeable battery
Outward appearance of AC power supply unit is shown on Fig. 5 and Fig. 6.
Power cord
Connector for
power supply
Fig. 5.
Screw for
adjustment of
rotation force
Fig. 6.
Record of service
Fig. 6а.
4. Unit design.
1.1. You should study this operating manual carefully before you are going to use the
Outward appearance of KATRAN is shown on Fig.3
1.2. The NLJD is supplied with a record of service, which should be always kept with it.
1.3. When sending the device for repair, the record of service should be delivered together
Antenna assembly
Receive/transmit unit
with the detector.
1.4. All notes in a record of service must be done in proper time.
1.5. All notes in a record of service must be written by ink, clearly and neatly. Any blots,
erasures and uncertified corrections are prohibited. .
1.6. It is prohibited to leave notes and records on the margins and cover of the record of
Telescopic rod
Receiving –transmitting unit is shown on Fig. 4 and Fig. 4a.
Battery cover
Power switch
Joint for
supply cable
Joint for head
Fig. 4.
Fig. 4a.
9. Recommended search practices.
9.1. Remove all electronic devises from the investigated room, if it is possible. If it is
not possible, you should operate at a lowered radiated power.
9.2. Set maximum output power and one of the operation modes of the receiver.
9.3. Position the antenna assembly parallel to examined surface at the distance of not
more than 10 cm.
9.4. Slowly moving the antenna assembly, keeping it parallel to examined surface and
varying the antenna orientation, analyze the pattern of change of received signal by the
second and the third harmonics. (In FМ and АМ modes the volume level should be set to
maximum, in "RSSI" the rate of clicks repetition has to be set to maximum).
9.5. Analyzing of level of received reflected signal by the second and the third
harmonics is made visually by the number of lightened diodes on the corresponding
indicating scale.
9.6. Remove the antenna assembly off examined surface or lower the output power and
repeat procedures, described in item 9.4
9.7. When detecting the artificial p-n junction, stable lighting of indicating diodes by
the second harmonics of reflected signal is observed, as a rule. When hammering of
estimated location of p-n junction, the display of the diodes will not change.
9.8. When detecting of natural p-n junction, stable lighting of indicating diodes by the
third harmonics of reflected signal is observed. When intensive hammering of estimated
location of p-n junction, the display of the diodes will change, as a rule.
The proposed procedure does not reflect all nuances, taking place in particular cases,
and should be taken as recommendation.
Control panel
Outward appearance of the control panel is shown on
the figure 7.
The buttons on the control panel have the following
VOL – Adjustment of sound level of demodulated
MODE – Choice of operation mode of transmitter
and receiver:
AM – Listening the demodulation response of the
2nd and 3rd harmonics at sounding object with pulsemodulated carrier;
FM – Listening the demodulation response of the 2nd
and 3rd harmonics at sounding object with frequencymodulated carrier;
Рис. 7.
CW – Listening the demodulation response of the 2nd and 3rd harmonics at sounding
object with unmodulated carrier wave;
RSSI – Listening to clicks through head phones (speaker). Repetition rate of clicks is
proportional to the signal level from 2nd and 3rd harmonic.
RX – Choice of radio receiving path.
2ND – Radio receiving path analyzing response on 2nd harmonic (enabled when LED is
3RD - Radio receiving path analyzing response of 3rd harmonic (enabled when LED is
TX – adjustment of output power of transmitter (0, 08 W; 0,16 W; 0,6
W; 2 W)
TEST – Indicates malfunction;
BAT – Indicates condition of rechargeable batteries.
5. Functions of main components and units of the NLJD.
The receiving/transmitting unit fulfils:
- Operation test of detector’s phase-locked-loop frequency control system. When it is
out of service, “TEST” light-emitting diode starts blinking.
- Analysis of frequency loading of radio receiving device which take place every time
when detector’s radio transmitter turns on.
That’s why in the presence of interfering signal (when working in a complex
electromagnetic environment) it is necessary to switch the radio transmitter off/on
periodically. Thereby an optimum frequency is selected, which provides the best
sensitivity and detection range of semiconductor elements.
- Forming of microwave signal with selected type of modulation.
- Reception and digital processing of the 2nd and 3rd harmonics.
Simultaneous indication of the 2nd and 3rd harmonics levels provides a reliable recognition
between artificial semiconductors, which are included in the electronic devices, and natural
corrosion ones, which appear at the junction of different metals.
- Demodulation of the 2nd and 3rd harmonics, their amplification up to the level required
for listening through the headphones and the internal speaker. The NLJD provides adjustable
amplification (20 dB). An operator can listen to the demodulated signals in turn.
- Indication of the 2nd and 3rd harmonics levels.
- Charging and performance testing if the internal rechargeable battery.
Outward appearance of the indication unit is shown on the Fig. 8.
Red LEDs –
2nd harmonic
Green LEDs –
3rd harmonic
Fig. 8.
6. Safety precautions
6.1. The personnel operating the unit should be instructed with the safety precautions at
work with electrical and radio measuring devices.
6.2. When using the detector together with other appliances you should ground their cases.
6.3. It is prohibited to open detector’s case when it is connected to the power supply.
Order of operation
7.1. Take the detector out of the transport bag. Please do not switch the detector on
at least for 30 minutes, if it was kept at the sub-zero temperature before.
7.2. For battery operation of the NLJD turn it on by a power switch situated in the
receiving/transmitting unit (Fig. 4a).
7.3. Check actuation of the NLJD. If the detector is enabled, the LEDs on the
control panel will light.
7.4. If you wish to listen to the response signal through the head phones, please
connect them to a joint on the receiving/transmitting unit (Fig. 4). Head phones are not
included in the supplied set.
7.5. Face the antenna away form an operator.
7.6. Set the minimum radiation power by the TX button. At the same time the
receive chain with a minimum level of interference will be selected automatically.
7.7. Using the control panel, set the required power of transmitter, radiation mode
and the operation mode of the receiving/transmitting unit.
7.8. If there is an electric main on the premises, it is recommended to power
“Katran” by the supplied AC power supply unit. Connect any end of the power supply
cable to the corresponding connector of the power supply unit (Fig. 6), and connect the
other end of the cable to the joint on the receiving/transmitting unit (Fig. 4).
7.9. Plug the power supply unit into a 220 V AC mains power socket.
7.10. Turn the power supply unit on by the ON/OFF switch (Fig. 5) and turn the
receiving/transmitting unit on by the power switch (Fig. 4a). Automatic recharging of
the battery will start. Carry out the further operation according to the clauses 7.3…7.7.
8. Battery charging and replacement.
8.1. Charging of Li-Ion rechargeable battery, supplied with the NLJD, is done
automatically when the “Katran” is mains-operated. If the battery is not fully charged,
the “BAT” LED will light green on a control panel.
8.2. You can recharge the battery, even when the receiving/transmitting unit is
switched off. Connect the AC power supply unit to the receiving/transmitting unit by a
power cord. Turn the power supply unit on, but not to turn the receiving/transmitting
unit on. If the battery is being charged, the “BAT” LED lights green; if the LED
doesn’t light, it means that the rechargeable battery is fully charged.
8.3. When “Katran” operates powered by rechargeable battery, the “BAT” LED
doesn’t light if the battery is charged. If the battery lights red, it means that battery is
8.4. To replace the rechargeable battery, slide the cover in the direction indicated by
the arrow (Fig. 3), and move out the rechargeable battery by a loop.
8.5. To place the rechargeable battery back, do the steps described in 8.4. clause in
inverted order.
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