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Installation of the ADU
2.3.1
To install the ADU
Prerequisites
• Check for potential interference, read more in Interference from radar, GPS, L-band
and other transmitters on page 2-13.
• Install the ADU at a location where vibrations are limited to a minimum.
• Maximum allowed cable loss ≤ 20 dB at 1950 MHz. This is to ensure optimum
performance of the system.
Installation procedure
To install the ADU, do as follows:
1. Install the mast with the mast flange and have the 4 M12 bolts ready.
2. Undo all shipping buckles, take off the wooden top and remove the casing.
3. Unscrew the 4 bolts holding the ADU on the wooden platform.
4. Attach a webbed, four-part sling with a belt to all 4 lifting brackets.
5. Attach 2 tag lines of suitable length to 2 lifting brackets and man them.
6. With a crane lift the ADU off the wooden platform and move it on top of the ADU
mast. It is important to maintain vertical orientation of the ADU center line.
7. Install the ADU on the mast flange with 4 M12 bolts and washers. Read carefully and
follow instructions given in To ground the ADU on page A-3.
Tightening torque value: 30 Nm.
Always use all 4 bolts when installing the ADU.
2-18
Current antenna
Figure 2-16: ADU installation, webbed sling attached to the 4 lifting brackets
New antenna
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