Nikrans LCD400-GSM+4G User manual

WWW.CELL-PHONE-SIGNAL-BOOSTER.COM
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Freq.: 900, 2600, 800 MHz
Coverage: 4400 ft²

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This user’s manual describes the installation and maintenance of wide band consumer boosters. Please do
read user manual carefully before installing and maintaining repeaters. The information in this manual is
subject to change without prior notice.
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Users must follow the principles below⯑
Repeater should follow system requirements; assure good grounding and lightning
protection.
The power supply voltage of repeater should meet security requirements; any operation
shall be carried out only after turning o\ power in advance. Only the professional is
authorized for the operation.
o not dismantle machine, maintain or replace its components by yourself, because this
way the equipment may be damaged and you may even get an electric shock.
o not open the repeater, touch the module of the repeater, or open the cover of the
module to touch electronic component. The components will be damaged due to
electrostatic.
Please keep away from heating equipment, because the repeater dissipates heat during
working. And do not cover a booster with anything that in^uences heat dissipation.

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Cell Phone Signal Booster is a perfect solution for providing improvement of cellular signal reception inside
a house, o_ce, restaurant, VIP Room, apartment, building or shopping mall.
Generally cell phones cannot pick up or maintain a strong cellular signal due to one of the two following
reasons:
1. !;0.@6;:;3@52#2.>2?@.?2(@.@6;: – Base stations are used to provide broad coverage. However
there are many areas in which signal strength gets reduced due to topographic peculiarities or local
Governmental restrictions regarding the height or location of base stations. Rural areas generally have
fewer base stations than urban regions.
2. #.@A>.8.:1".:".12$/?@>A0@6;:? – Signal strength can also be negatively a\ected by trees, hills,
buildings, weather and other obstructions. You may be relatively close to a base station but still unable to
make a call. This often occurs inside houses, o_ces and other buildings with stucco, concrete or metal
walls that may block the signal.
The Signal Booster works with two antennas. An Indoor antenna communicates with your cell phone and
an Outdoor antenna communicates with the base station (BS). The Outdoor antenna receives a signal from
the BS and sends it through the cable to the Signal Booster, where it gets ampli]ed and re-transmitted by
the Indoor antenna throughout a building. When the Indoor antenna picks up a signal from your cellular
device, the Signal Booster ampli]es that signal and transmits it through the cable to the Outdoor antenna
and back to the BS.
(Note: The Signal Booster will only operate if there is an adequate signal to amplify.)

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Indoor coverage: 4400 ft²
Up-link freq: 880~915MHz & 832-862MHz & 2500-2570MHz MHz
own-link freq: 925~960MHz & 791-821MHz & 2620-2690MHz MHz
Up-link Gain: 60 dB
own-link Gain: 65 dB
Power supply: Input AC90~264V,output C5V/2A
Energy Consumption: 0.03 kW/h
Working t °C: -25/+55
Humidity: 5 - 95 %
Size (mm): 181*142*33
Booster Weight: 1.2 kg
dBm: 14 dBm

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The picture below shows how simple and fast booster installation is and how e\ectively it works.
A Yaggi or panel antenna (it depends on the booster model and its power), as donor/outdoor antenna, is
installed at the top of the roof to pick up good mobile signals from the base station, and sends them
through the cable to the booster where the signals get ampli]ed signi]cantly; and then the output signals
are distributed throughout the area by the indoor/server antenna. Clear phone calls or high speed mobile
data are immediately achieved within the area.
A repeater kit includes:
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Outdoor panel or wide band Yaggi is recommended.
Function: To pick up outside signals from the base station and send them by cable to the repeater;
outdoor antenna also transmits the uplink signals from the repeater back to the base station.
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It is mounted inside a building to transmit the improved signals throughout the coverage area.
•./82?: Сoaxial cables for indoor and outdoor antennas.
•";A:@6:4?: Special mountings for antennas and the booster (depends on a booster model)
• Power Supply
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•(<86@@2>? or couplers: when the building structure is too complicated or there is big loss due to
thick walls or other reasons, splitters or couplers shall be used so that more antennas can be
installed in separate zones to distribute the signals to each corner of the coverage area.
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The repeater’s main function is to improve weak RF signals in an area. The formula is: Input power +
Gain= Output power. The signal strength from an outdoor antenna directly a\ects the e_ciency of the
indoor coverage. It is very important to choose the correct outdoor antenna location in order to get the
best signal.
If you don't know exactly where your operator's base station is located, go through the antenna aiming
process for getting the best result. To aim the antenna correctly, follow the steps below:
1. Setup the entire booster system, including antennas and cables, and power it on.
2. A person on the roof aims the antenna in a certain direction. The other person inside waits for 1
minute and checks signal level on the phone.
3. Then rotate the antenna its 1/8th of the way around, which equals 45 degrees. The person inside
does the same procedure with signal testing.
4. Repeat the process 8 times until you try all 8 directions, in every 45 degrees sector.
5. Compare the results of signal testing – the closer dB parameter to 0, the better booster
performance you get.
6. Fix the antenna in the direction with better signal result.
Note! We recommend mounting the antenna on the side of the building aiming away from the building,
which will reduce amount of possible obstacles. For your convenience and acceleration of the process
perform the testing in pair.
• The mobile phone shall display full bar signals in location where the outdoor antenna is installed
Phone calls or data transmission shall be smooth and stable. It is recommended to test the signal
3 times in location where an outdoor antenna is to be installed
As shown from the illustration above, you should test the signals in points from A to E, and select a
best place that displays full bar signals.
• Outdoor antenna installation Requirements:
Outdoor antenna should be installed on the roof of the house or in some other place where your
mobile device is within coverage zone. Mobile signal should be as strong that at least three-four
bars are indicated on your phone display.
Outdoor antenna should be ]xed in straightly.
It is necessary to waterproof connectors of the outdoor antenna and feeder lines.
Repeater is a two-way signal ampli]er. So proper isolation between outdoor antenna and indoor
antenna is necessary in order to avoid self-oscillation. A perfect example of self-oscillation is when
you take a MIC and a loudspeaker for example; if they are too close to each other, it could cause
big noise.
If isolation can’t be achieved due to limited distance, the roof of the building, walls or any other
barriers can be used between antennas to increase isolation.

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1. Keep the type, speci]cations, routing direction, location and curvature radius of cables in
compliance with the model requirements. Place cables in correct order, bend them smoothly, and
protect the surface from any damage.
2. Place RF cables separately from power cables. Take proper isolation measures if they have to be
placed on the same cable racks owing to the site condition restrictions.
3. Fasten all connection parts of the whole system in correct order, from the antenna to repeater
interfaces, and make sure that the electrical interfaces are well contacted. Give waterproof
treatment to outdoor connection parts.
4. Take lightning protection measures for the antenna and feeder system in accordance with the
system requirements. Avoid deforming the antenna feeder where grounding clips are placed, and
give waterproof treatment to the feeder.
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Correct antennas types shall be used according to the site conditions and the requirement.

1. Omni antenna (ceiling Omni or whip antenna) shall be installed in the center and radiate all
directions.
2. It is better to use a directional panel antenna or Yaggi antenna when the area shape is long and
narrow (corridors, long row of houses in two sides, tunnels or elevators or rural open space).
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• indoor antenna should be 5 meter distance from an outdoor antenna
• indoor antenna should be at least 2 meters above the ground
• indoor antenna should be ]xed vertically with the ground.

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1. The repeater shall be installed indoor in a cool, dry and ventilated room without erosive gas or
smoke, or on a cool and ventilated wall to ensure excellent heat dissipation.
2. Installation height should be su_cient for RF cable wiring, heat dissipation and maintenance.
3. Independent and stable power supply is necessary.
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Generally AC 100~264V AC / 50±5Hz power supply is required.
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Installation with 1 indoor antenna

Installation with 2 indoor antennas
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1. Find an appropriate position for an outdoor antenna. ( see the r equirements in 6.1. sect. )
2. Plug in the outdoor antenna to the mobile booster from BS side and fasten tightly.
3. Plug in the indoor antenna to the mobile booster from MS side and fasten tightly.
4. Connect the signal booster to the Power Supply.
!Some models have an inbuilt Power Supply. Please, examine the manual applied to your model, if
your signal repeater kit doesn’t include separate Power Supply, skip this step!
If the light indicator on the booster turns on it means the installation has been implemented
correctly.
NOTE: Switch on the signal booster only after you connect outdoor and indoor antennas in the
proper way!
5. Test the signal of your mobile telephone – a maximum quantity of bars should be indicated on the
display of your phone in each corner of the location within booster coverage zone. In case the
mobile signal is still instable try to change the position of the outdoor antenna for more proper
one.
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1. Cables from outdoor antenna should not be wound and be placed as straight as possible in order
not to create any hindrance for signal reception and its transmission.
2. Cables should be shortened to the acceptable maximum so that not to waste or decrease mobile
signal coverage range.

3. In order to prevent water from coming into the mobile phone booster through the cable make a
loop in it.
4. Keep the outdoor antenna as far as possible from frequency aerials, high voltage cables, metal
nets or transformers.
5. Never point the front of a irectional outdoor antenna towards the indoor antenna.
6. Plug the power supply into the Signal Booster input (carefully, to avoid damaging the center pin)
and then into a wall outlet.
#;@2 It is recommended to plug all AC power supplies for home electronics into a Surge Protector
Power Strip.
7. If the light indicator doesn’t turn on, please see the lights indication instructions.
8. Using multiple Signal Boosters in one installation could cause interference to the base station
(except for the In-Line Signal Boosters).
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1. Outdoor port BS: for connecting the outdoor antenna by cable.
2. Indoor port MS1: for connecting the indoor ceiling antenna by cable.
3. Indoor port MS2: for connecting the indoor whip antenna directly or the indoor ceiling antenna by
cable.
4. C IN: for connecting a power supply.
#;@2 You can use only 1 indoor antenna instead of 2 in case the area to cover is small.
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Choosing accessories pay attention to the two characteristics – frequency and impedance. All accessories
shall support the repeater’s frequencies. For example, if the repeater’s frequency is GSM900, all the
accessories must support the GSM900 frequency.

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Introduction screen. The introductory page is displayed at the screen for 10 sec during the system check-
up.
When the device completes the internal self test, it shows the standby screen. If the arrow down is
displayed at the bottom right corner, the device has detected signal reception problems. In this case press
Page own button to see possible solutions. Resolve the issue basing on the recommendations.(see
possible troubles and solutions below in Questions & Solutions paragraph)
If the problem is resolved, the screen will display as below. No arrow means that the repeater works
correctly:
!# BS shows the level of outdoor incoming signal for the corresponding frequency band. Make sure it
is as low as possible.
Note! For the optimal functioning of the booster, the BS (input) index should be from -65 to -50 dBm. If the
BS is lower than - 65dBm, the coverage will be smaller. However, the device can work normally. If the BS is
too weak, it'll be necessary to adjust the position of the outdoor antenna by raising it as high as possible

(on a pole on the rooftop) and pointing it towards the provider's nearest base station.
If the BS is higher than - 50 dBm, the device will have self-excitation issue. In such cases, the output signal
will drop during communication. If the antennas are placed very close to each other, it will evoke self-
excitation. To ]x the problem, you would need to place the outdoor antenna at thelargest possible distance
from the indoor antenna.
!# MS shows the output power of a booster.
Note! The MS (output power) index must be between +05 and +15 dBm. evice Gain must be 65/65 dB.
!# evice gain shows the current gain (left) and maximal gain (right) of the device. For optimal
function both values must be equal (current gain=max gain).
Line 4 shows that power supply is connected and works properly ( C5V) and automatic gain control of the
system is also active (AGC).
!# Power C 5V shows that power supply is connected and works properly. AGC function for
automatic gain adjustment.
Note! In LINE 4 in its right corner can appear the exclamation point or an arrow. It denotes an installation
error. Use UP and OWN buttons to see the reasons. For more details, read the section QUESTIONS &
SOLUTIONS.
*%A@@;:: Go to the previous page to check the functioning status of the device or see the error
description.
$,#A@@;:: Go to the next page to check the functioning status of the device or see the error
description.
On the LC screen you can see essential data about supported frequency bands. epending on your
model and the number of bands, the displayed data will vary.
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( – data for the lowest of the supported bands
( — data for the highest of the supported bands
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( – data for the lowest of the supported bands
( — data for the middle of the supported bands
( — data for the highest of the supported bands

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If the device detects that the incoming signal is weak, try 3 possible solutions:
• Solution 1. irect the outdoor antenna to provider’s nearest base station.
• Solution 2. Change the position of the outdoor antenna. Try to put it as high as possible.
• Solution 3. Reinstall the outdoor antenna trying to avoid obstacles between the antenna and
provider’s base station.
If the device detects that the outdoor antenna is too close to the indoor, change the position of either or
both antennas to avoid self-oscillation. Mount them at least 15m one from another.
If the device detects self-oscillation between the antennas and says that the system is being adjusted, it
means that the system has detected the problem of bad isolation between the antennas and AGC is
adjusting the system gain automatically to make the device work correctly. No actions are required from
you.

If the system shows “ evice was damaged” note, it means that the uplink/downlink was damaged.
Contact customer service for repair.
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For the optimal functioning of the booster, the BS (input) readings should be between - 65 and 50 dBm.
The MS (output power) readings must be between +05 and +15 dBm. evice Gain must be 65/65 dB. If
the BS is lower than - 65dBm, the coverage will be smaller. However, the device can work normally. If the
BS is too weak, it'll be necessary to adjust the position of the outdoor antenna by raising it as high as
possible (on a pole on the rooftop) and pointing it towards the provider's nearest base station. If the BS is
higher than - 50 dBm, the device will have a self-excitation issue. In those conditions, the output signal will
drop during communications. If the two antennas are placed very close to each other, it will evoke self-
excitation. To ]x the problem, you would need to place the outdoor antenna at the largest possible
distance from the indoor antenna.
In case of installation errors an exclamation point/arrow appears on the LC screen. It happens in two
cases:
1. Input signals (external BS) are weak.
It can happen that even with a weak signal the ampli]er works well. In this case, nothing should
be done. Just ignore a ^ashing exclamation point. However, if the indoor coverage is still very
low, it will be necessary to adjust the position of the outdoor antenna so that it can pick up a
stronger signal. For that, try 3 possible solutions:
Solution 1. irect the outdoor antenna to provider’s nearest base station.
Solution 2. Change the position of the outdoor antenna. Try to put it as high as possible.
Solution 3. Reinstall the outdoor antenna trying to avoid obstacles between the antenna and
provider’s base station.
2. The separation between the two antennas (outside and inside) is not su_cient.
This can cause interference between antennas and, as a result, the device will reduce the
device gain. The output signals will, therefore, be very weak. To avoid the risks of this type of
malfunction, make sure not to put the 2 antennas too close to each other, ( = 10-20 m) and
never to orient them face to face, ideal would also be that they are not in direct vision (use of a
mineral or metallic obstacle, wall, ceiling, slab, etc.), and they aim opposite directions, or at
least frankly di\erent.
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The signal booster enters into Sleep mode only when you don’t use it. uring Sleep mode only the LC
display turns o\, while the ampli]cation system keeps on functioning. This function allows saving energy.
In case you need to see information on the screen, just push any button.
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Yes, you can use only 1 indoor antenna if the distance between both indoor antennas in your case cannot
exceed 5m. However, if you can install the indoor antennas at the distance exceeding 5m or create some
obstacles like walls between them, we recommend you using 2 indoor antennas for more e\ective signal
distribution and larger coverage.
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1. Take a test with a mobile phone or a data card (engineering mobile phone is preferred).
To test signal level with a cell phone, make use of its engineering mode (Field Test Mode), which
is an application available in free access or a phone mode requiring no extra setups. On most
used mobile OS (operating systems) the test mode can be started as follows:
◦ iOS. Type *3001#12345#* and hit Call
◦ Android. Type *#*#197328640#*#* to activate
◦ Windows. Type ##3282# and start.
◦ Blackberry. Press TOOLS, SETTINGS, STATUS or OPTIONS, STATUS.
Note! To get parameters for 2G, 3G and LTE, disable WiFi. In case you cannot ]nd Field Test
Mode on your cell phone, use bars on the screen of your mobile phone to evaluate the change.
If the signals in most areas have not been improved, please check recommendations below again:
- Weak input signal leads to low output power. To increase input signal power level, change the
direction of the outdoor antenna or its installation position or replace it for an antenna with higher
gain.
- Check whether it is necessary to use additional indoor antennas as barriers block signal
penetration; also check whether the repeater’s power is enough; please install extra indoor
antennas or replace the repeater for another model with higher power level.
2. If the signals in small parts of the area have not been improved, please check the following:
- Check whether the indoor antenna is installed correctly or not; you may try to change the
antenna location to improve coverage.
- Check if it is necessary to adjust the direction of the indoor antenna.
- Check whether it is necessary to add one or more antennas to enhance the coverage in special
areas.

For maximum precision in signal level testing, switch your cell phone into Field Test Mode and see dB
parameter. The closer dB signal level to 0, the better cell phone reception you’ll get.
• -105 to -100 = Bad/drop call
• -99 to -90 = Getting bad/signal may break up
• -89 to -80 = OK/shouldn't have problems, but maybe
• -79 to -65 = Good
• Over -65 = Excellent
Your task is to get at least -79dB signal to ensure reliable communication and strong signal inside the
building.
Remark:
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•:0>2.?2;A@<A@<;C2> — recommended ways: to adjust outdoor antenna direction/location, or
replace it to an antenna with higher gain to increase input signal strength.
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1. The power is on but there is a signal ^uctuation or a ^ash signal. The phone call cannot be made/
received.
It shall be caused by the insu_cient isolation between outdoor and indoor antennas.
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- Firstly check whether the alarm LE lights. The light may indicate the isolation is insu_cient.
- Secondly adjust the antennas’ directions or locations or enlarge distance between them.
- Thirdly reduce the repeater’s gain by ATT IP if the above listed methods don’t work.
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- Use the roof of the building to enlarge isolation (Please try to place the outdoor antenna and
indoor antenna on di\erent ^oors).

- Use some obstacles (Such as walls).
2. The repeater’s power is on but the phone cannot get connected to the network and still can not
communicate.
'2.?;: There are loose or wrong connections in the repeater system.
(;8A@6;: Please try to fasten the connections between di\erent parts of the system.
'2.?;: The signals received by outdoor antenna of other operators nearby are too strong. (For
example, the other operators’ signals are 10 dB stronger than the needed signals.)
(;8A@6;: Change the direction of the outdoor antenna or its installation position, so that the
gap of signal strength is reduced between operators.
(;8A@6;: Use barriers (like buildings and walls) to block signals from other operators.