1- Antenna Mount - Sagem -LINK F Installation And Operation Manual

SAGEM-LINK F
Installation and Operation Manual
• 15 GHz → 14.4 - 15.35 GHz
• 18 GHz → 17.7 - 19.7 GHz
• 23 GHz → 21.2 - 23.6 GHz
• 26 GHz → 24.5 - 26.5 GHz
• 38 GHz → 37 - 39.5 GHz
Alternative antennas to those specified by Sagem may be used, but they must meet the following
requirements
• Minimum gain to achieve adequate link margin,
•
Radiation Pattern Envelope compliant to the network and country regulations
•
Mechanical characteristics to meet specific site requirements (wind and frost resistance)
NOTE: With some antennas, the manufacturer's guarantee applies only if the antenna feed is
pressurized. Therefore, it is essential to observe the recommendations relative to the selected
antenna type. Provision must therefore be made for:
installation and connection of a pressurizing system if the antenna is connected to the ODU
with a waveguide;
use pressurization windows and seals to protect waveguide connections.

1.4.1- Antenna Mount

In most cases, the antenna mounts provided by antenna manufacturers fit on tubular poles
(diameter 88.9 to 114 mm).
If the antenna is installed on towers using another type of structure (e.g., square-section tower),
special mounting kits must be used for this support.
The following precautions must always be taken :
- Allow enough clearance (± 10°) about the alignment axis. Leave also adequate space
around the ODU to allow easy mounting.
- make sure that nothing may obstruct the link, even partially, especially in the near field of
view,
- keep enough room for access to the antenna and ODU (for set-up and maintenance
measurements),
- install proper lightning rod and earthing,
Note: If there is an existing lightning rod, make sure that the ODU installation site is covered by
the lightning protection cone.
- misalignment under extreme weather conditions must not exceed ± 20 min angle in elevation
and azimuth.
The antenna mount may be secured in different ways depending on the antenna installation site
type and environment :
- mounting pole secured to the HEA section with a back-plate or clips,
- mounting pole secured to a square-shaped base plate with threaded rods. The base plate is
set on top of a resilient plate which may be installed on the terrace of a building without
affecting water-tightness,
- wall-mounted staff on the building front,
Reproduction and communication prohibited without the written permission of Sagem Communication
288055571-04
Page 9/142
Issue 04 : July 2005