mw antenna alignment.ppt

8/11/2019 mw antenna alignment.ppt

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HUAWEI TECHNOLOGIES CO., LTD.

2014 10月1

Microwave Antenna Alignment


www.huawei.com

Wang Fuzhong

Transmission Engineering Dept.




Tools and Resources for antenna Alignment

Riggers for antenna alignment: 4person, 2 for each site

Multimeter: 2pcs, one for each site

Laptop: 1, for Radio configuration and RSL check

Engineering Order Wire handset

Spanner (Wrench)

Binoscopic




Antenna Radial Profile

Simplified to

>15dB




Antenna Radial Pattern Envelope (RPE)

Top or side View of the antenna (RPE)

Main Beam

1st Side Lobe

The theoretic difference of thegains between main beam

with 1st side lobe: 15 to 20dB.

During panning, If the difference between RSL with objective is less than 15dB, itmeans the main beam already touched. Just do the fine-tuning.




Antenna Radiation Patterns Envelope (RPE)

Main beam

1st Side Lobe

Boresight View




Antenna Radiation Patterns Envelope (RPE)

Side

View

Top

ViewMain beam

1st Side Lobe

Main beam

Main beam

Boresight View

HPBW

FNBW: First Null BeamWidth


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Antenna Alignment

Pan the antenna by Multi-meter & LCT

+3.45V

RSSI/V AGC

1st Side Lobe

Main beam

Azimuth

ODU

Multi-Meter

RSSI or AGC

Voltage

IDU

I F C A B L E




Antenna panning (Horizontal)

Top

View

Main beam

Main beam

1st Side Lobe




Antenna Panning (Vertical)

SideView

Main beam

Main beam

1st Side Lobe




Antenna Alignment (Horizontal)

Misaligned Proper Aligned




Antenna Alignment

Line A-A represents the azimuth tracking path of a properly aligned antenna.

The main beam is at point 2, and the first side lobe at points 1 and 3.

Boresight View of Azimuth Tracking

Paths for Different ElevationsSignal Levels for Each Track




Antenna Alignment (Up and Down)

Reflecting Ground or Specular Plane

Up and Down Misaligned





Antenna Alignment (Up and Down)

Aligned properly


S i l li t t iti t l fl ti




Special alignment to mitigate specular reflection

multipath fading for extremely long haul

Proper Aligned


A little up-tilt (0.35 to 0.5 degree, depending on the FNBW) of the

antennas so as to mitigate major ground specular refelection which

result in multi-path fading at long haul link which over water-body




Steps for MW Installation

Check RFT (Ready for Telecom)

Safety check

Antenna and Outdoor works first under good weather condition

IF cabling or Elliptical waveguide laying

Indoor works (even in bad weather or night time)

Labelling all the cables and links

Grounding

Premises Cleaning after the works

Power Tapping

etc.




Steps for antennas panning

Pointing both side antennas to each other by azimuth

Power on both sides’ radio

Panning by multi-meters as well as Laptop with LCT

Keep one antenna, i.e. Antenna #01 immobility (fixed temporary)

Panning antenna #02 (coordinate antenna) at azimuth first(Horizental),

achieve RSL(or RSSI) peak, then by up/down (or Vertically), achieve

the peak RSL (or RSSI) also, fix it temporary

Panning antenna #01 with the same way as above, then fix it

Panning both sides antennas alternately till to achieve expected RSL




Thank You

www.huawei.com

mw antenna alignment.ppt

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