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Repeater Commissioning

Downlink gain setting

First the alarm LED only indicates the downlink input power level, here we use color of Alarm LED to adjust the gain of

the repeater. Alarm LED color must remain green. As for the downlink working performance, it is a good working point
that Alarm LED maintains “Green” color with the intention of turning orange; here we refer as “edge point”. At this time,
downlink output power and coverage effect are stable.

And the equipment must be as far as possible away from overloading status of “red” (the equipment would hold
higher interference and depression ability at this stage). So we shall try our best to set the equipment near “edge
point” of green and intention of turning orange during engineering.

Setting of “edge point”:

Switch on the power supply after connection with donor antenna and server antenna, and observe ALARM LED.

• If it shines “orange”, use 1dB as step to reduce the gain until “green” turns on, then increase the gain 1~3dB

attenuation value until “orange” starts to turn on, then brings back 1~2dB till “green” is on, then fix the gain
and the repeater’s downlink output power reaches the perfect status.

• If it shines “green” then:

Please check coverage effect firstly, if the coverage effect is good, the engineering has reached
expecting target, thus there is no need to do anything.

• To check whether the attenuation value has been set, if it is, use 1dB as step to increase gain until the

“orange” turns on, then brings back 1~2dB till “green” is on again , then the repeater’s downlink output power

reaches the perfect status.

• But if attenuation has not been set, it indicates that the input power is not strong enough to let the repeater

reach its good coverage.

If the coverage effect is not good, the donor antenna should be adjusted to get stronger input signal. It is
recommended that one person shall check the coverage effect inside the building when the other person is trying to

adjust the antenna or the repeater. At this stage, please make sure “Orange” color will not be generated by self

oscillation. Please take off the server antenna to check if it is self oscillation or not: if the Orange turns to be green, it
is self oscillation; if it stays as Orange, it is not self oscillation. Please follow steps in other page to turn Orange to be

Green.

Uplink gain setting

Standard: uplink attenuation values =downlink attenuation values

Remark

: Avoid putting more than a 5dB difference between the Uplink and Downlink. And Uplink gain must be equal to or

less than Downlink gain, it can’t be more in order to avoid interference with mobile network.

Questions & Solutions

What signal level in dBm is optimal for the correct booster functioning?

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 b05 and +15 dBm. Device 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

Summary of Contents for NS-550GDW

Page 1: ...WWW MOBILE SIGNAL BOOSTERS SHOP INSTALLATION GUIDE CELL PHONE AMPLIFIER Nikrans NS 550GDW Freq 900 1800 2100 MHz Coverage 5400 ft...

Page 2: ...et security requirements any operation shall be carried out only after turning off power in advance Only the professional is authorized for the operation Do not dismantle machine maintain or replace i...

Page 3: ...Signal strength can also be negatively affected 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...

Page 4: ...900 and 2100MHz In addition this triband repeater will also boost 4G Internet at 1800MHz frequency band As a result you get an opportunity to improve GSM 3G and 4G signals at the same time Here are a...

Page 5: ...eq 890 915 1710 1785 1920 1980 MHz Down link freq 935 960 1805 1880 2110 2170 MHz Up link Gain 60 dB Down link Gain 68 dB Power supply Input AC90 264V output DC5V 2A Working t C 25 55 Humidity 5 95 Si...

Page 6: ...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...

Page 7: ......

Page 8: ...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 di...

Page 9: ...er 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...

Page 10: ...gi antenna when the area shape is long and narrow corridors long row of houses in two sides tunnels or elevators or rural open space Requirements to indoor antenna installation indoor antenna should b...

Page 11: ...r smoke or on a cool and ventilated wall to ensure excellent heat dissipation 2 Installation height should be sufficient for RF cable wiring heat dissipation and maintenance 3 Independent and stable p...

Page 12: ...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 m...

Page 13: ...ics 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 7 3 Repeate...

Page 14: ...ystem have two sets of power and alarm LEDS and three system repeaters have three sets of LEDS Each system has own relevant LED and please refer to the correct LED for system performance evaluation Th...

Page 15: ...ip switches to reduce gain as follows Put ON a pair of switches for a total of 15dB reduction in gain DL1 UL1 Alarm Low For 800MHz or 900 MHz Band DL2 UL2 Alarm High For 1700 1800 1900 2100 MHz Band R...

Page 16: ...N a pair of switches for a total of 15dB reduction in gain DL1 UL1 Alarm Low For 800MHz or 900 MHz Band DL2 UL2 Alarm High For 1700 1800 1900 2100 MHz Band For triple system metal closet For example F...

Page 17: ...as not been set it indicates that the input power is not strong enough to let the repeater reach its good coverage If the coverage effect is not good the donor antenna should be adjusted to get strong...

Page 18: ...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 lo...

Page 19: ...sures Firstly check whether the alarm LED lights The light may indicate the isolation is insufficient Secondly adjust the antennas directions or locations or enlarge distance between them Thirdly redu...

Page 20: ...installing the repeater what should I do Check if the repeater s power supply works normally or not 3 If repeater s power supply is normal ALM light is on or flashing all the time what should I do Fir...

Page 21: ...nd all in one solutions covering up to 5000 m2 Depending on the model boosters operate in GSM DCS CDMA LTE or combination of these standards at 850 2100 MHz frequencies The product line is extended wi...

Page 22: ...t this signal booster is in compliance with the essential requirements and other relevant provisions of Radio Equipment Directive RED 2014 53 UE CE marking info mobile signal boosters shop 44800069868...

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