1. Module 6 Antenna Assembly and Look up Angles
Ground System Training Department
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2. Module Objectives
At the end of the module the participant shall be able to:
Explain steps of antenna assembly and installation.
Describe concept of look up angles (AZ, EL, POL).
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3. Antenna Assembly
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4. Antenna Assembly Steps
Prepare rigid antenna foundation
Assemble antenna stand
Fix stand to the foundation
Assemble antenna reflector to its cap mount
Fix antenna with its cap mount onto the mast pipe
Connect feed legs and feed assembly to antenna
Pre-adjust look up angles (AZ, EL, POL )
Connect ODU to IDU using 10m reference cable
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5. Prepare Rigid Antenna Foundation.
Ground Base:
Location: no water source close by
Soil underneath the concrete must be dense.
Wait for the concrete to be dry before attaching antenna stand on top
Make sure to use stainless steel screws.
Concrete Pole Base:
Concrete Pole must be securely installed on the ground.
Stand should be securely tighten with the iron pole.
Wall Base:
Brick wall: concrete between bricks must be strong enough to hold the antenna, not drywall.
Wooden wall: fasten into the wood studs, not the boards.
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6. Type of Antenna Stands 2. Three-legs Stand 1. Four-legs Stand
3. Three-legs Wall Stand
4. Concrete Pole Stand
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7. Four-legs Antenna Stand Assembly
1. Connect leg pieces
2. Assemble pipe
3. Install standing support
4. Check for perpendicular on both sides
Liquid-filled Level
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8. THAICOM Vision in Communications
9/15/2018
Antenna Assembly
There are various types of antenna authorized by IPSTAR.
Raven:
0.84m antenna
1.2m antenna
1.8m antenna
2.4m antenna
Patriot:
Prodelin:
However, this module will only show the process for assembly 84cm and 1.2m antenna from Raven.
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9. AZ/EL/Skew Cap Mount and Hardware Detail of AZ/EL/Skew Cap Mount
84cm Antenna Assembly
**Refer to antenna assembly manual for more details.**
AZ/EL/Skew Cap Mount and Hardware
Detail of AZ/EL/Skew Cap Mount
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10. 84cm Antenna Assembly (Continue)
**Refer to antenna assembly manual for more details.**
Assemble AZ/EL/Skew Cap Mount on reflector
Connect Reflector on pipe
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11. 84cm Antenna Assembly (Continue)
**Refer to antenna assembly manual for more details.**
Set feed assembly initial position & Connect it to the feed support arm
Connect Feed Arm to the reflector
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12. 1.2m Antenna Assembly (No Az Fine Tune)
AZ/EL Cap Mount
Assemble AZ/EL Cap Mount on reflector
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13. 1.2m Antenna Assembly (with Az Fine Tune)
AZ/EL Cap Mount
Assemble AZ/EL Cap Mount on reflector
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14. 1.2m Antenna Assembly
The Az/El/Pol cap mount with circular hole does not require ring when assembly.
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15. 1.2m Antenna Assembly
The Az/El/Pol cap mount with slotted hole requires a ring to lock the bolt from moving.
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16. Side Feed Legs Installation Connect Reflector on pipe
1.2m Antenna Assembly
Side Feed Legs Installation
Connect Reflector on pipe
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17. Connect Feed Legs & Junction Block Bottom Feed Leg Installation
1.2m Antenna Assembly
Connect Feed Legs & Junction Block
Bottom Feed Leg Installation
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18. Connect Feed Assembly to Reflector
1.2m Antenna Assembly
Connect Feed Assembly to Reflector
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19. Antenna Look up Angles
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20. Antenna Look up Angles
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21. Finding Azimuth (AZ), Elevation (EL), Polarization (POL)
Installation Job order created by provisioning system (Webpro) provides Azimuth (AZ), Elevation (EL), Polarization (POL) angles as shown in the following figure.
AZ, EL,POL
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22. Pre-adjusting Look up Angle
THAICOM Vision in Communications
9/15/2018
Pre-adjusting Look up Angle
Azimuth (AZ)
Use compass to find the azimuth angle and turn the antenna in clockwise or counter-clockwise direction.
Elevation (EL)
Use inclinometer or EL indicator to find the elevation angle and adjust in upward or downward direction.
Polarization (POL)
For 0.84 m antenna : Rotate the reflector.
For 1.2 antenna : Rotate the feed assembly
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23. Azimuth Angle (AZ)
Azimuth is the angle measured eastward from the geographic north to the projection of the satellite path on a (locally) horizontal plane at the earth station.
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24. Adjusting Azimuth Angle
Use compass to find the azimuth angle.
To ensure an accurate compass reading, stay away from large metal objects and magnetic source.
To double check accuracy, take multiple reading several feet apart.
The compass needle reading is according to the magnetic North or nearby magnetic source, however the Az angle is based on the True North.
The declination of each location from True North due to Magnetic North can be calculated from
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25. Elevation Angle (EL)
Elevation is the angle measured upward from this (local) horizontal plane to the path of the satellite.
Elevation Angle
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26. Adjusting Elevation Angle
Loosen Elevation Locking bolts in curved slots and pivot bolts (both sides) 1/2 turn.
Turn elevation adjustment bolt clockwise to decrease and counterclockwise to increase elevation.
Align the edge of clamp with appropriate mark on housing at the desired elevation angle.
To adjust EL Angle
To measure EL Angle
84cm Antenna
1.2m Antenna
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27. Adjusting EL Angle Loosen 2 El locking nuts. Rotate El fine tune bolt.
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28. Polarization Angle (POL )
Polarization is a way to orient transmission signals in a specific direction.
IPSTAR uses linear polarization.
UT Receive: Vertical
UT Transmit: Horizontal
Remark: Polarization of China and Indonesia’s shape beam is vice versa.
For 0.84 m antenna : Rotate the reflector.
For 1.2 antenna : Rotate the feed assembly
0.84m
Positive POL angle
Negative POL angle
1.2m
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29. Adjusting Polarization Angle of 84cm Antenna
Loosen the (four) skew locking bolts until it’s rotatable.
Rotate the reflector until the indicator mark on the reflector align with skew angle on Az/El/Skew Cap Mount.
Tighten skew locking bolts. **DO NOT over tighten**
Skew Angle = 90 – POL Angle
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30. Adjusting Polarization Angle of 84cm Antenna
Feed assembly setting for each country.
LNB will be pointed in 3 o’clock or 9 o’clock direction.
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31. Adjusting Polarization Angle of 1.2m Antenna
Positive POL angle
Negative POL angle
Loosen the (two) M6 x 16 mm Hex Head Bolts.
Rotate the feed assembly according to the job order.
Tighten M6 x 16 mm Hex Head Bolts. **DO NOT over tighten**
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32. Adjusting Polarization Angle of 1.2m Antenna
Ref - + + -
Ref
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33. Adjusting Polarization Angle of 1.2m Antenna
Positive Polarization Angle
POL = 0°
Ref - +
POL = 23.8°
Ref
+23.8°
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34. Adjusting Polarization Angle of 1.2m Antenna
Negative Polarization Angle + -
Ref
-23.8°
POL = 0°
POL = -23.8°
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35. Adjusting Polarization Angle of 1.2m Antenna
Ref - +
Shape Beam (Indonesia and China) - +
Ref
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36. Module 6: Quiz 1
If antenna must be installed into the wooden wall, what installer must do ?
A. Screw it to the board.
B. Screw it to the wood stub.
C. Screw it to the corner border.
D. None of the above 2
What is look up angle ?
A. Azimuth
B. Elevation
C. Polarization
D. All of the above 3
For Az/El/Pol cap mount with Az fine tune, flat washer, spring washer and nut must be used for assembly cap mount with circular hole.
A. True
B. False 4
For Az/El/Pol cap mount with Az fine tune, it is necessary to loosen two El locking bolts before rotate El adjust bolt.
A. True
B. False
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37. Module 6: Quiz (Continue)5
If polarization angle of 1.2m antenna is negative, where LNB should be located at initial position (POL = 0°).
A. 3 o’clock
B. 6 o’clock
C. 9 o’clock
D. None of the above 6
After adjusting polarization, BUC should be on top of LNB.
A. True
B. False
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