Nikrans NS-550GDW, Installation Manual

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6. ANTENNAS AND CABLES SETTING UP
6.1. Outdoor antenna installation
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 affects the efficiency 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 fixed in straightly.
It is necessary to waterproof connectors of the outdoor antenna and feeder lines.
Repeater is a two-way signal amplifier. 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.