Itron Inc. CCU100T Manual Do Utilizador
Chapter 2 Planning a CCU/Repeater Installation
10
CCU 100 and Repeater 100 Installation Guide
Proprietary and Confidential
• The antenna receives and transmits in all directions. Any objects such as building
walls, nearby metal surfaces or other obstructions will interfere with the proper
operation of the antenna.
operation of the antenna.
• Do not mount the antenna near existing RF radiating antennas. If existing RF radiators
are nearby, the horizontal separation distance to the radiator must be a minimum of
100 feet and/or 10 feet of vertical separation. In instances where nearby RF radiators
are present, conduct an intermodulation interference study to evaluate the potential for
interference and any effects it may have on system performance. Consult with your
Itron systems engineer for more information.
100 feet and/or 10 feet of vertical separation. In instances where nearby RF radiators
are present, conduct an intermodulation interference study to evaluate the potential for
interference and any effects it may have on system performance. Consult with your
Itron systems engineer for more information.
• When mounting the antenna, evaluate nearby buildings and the effect they may have
on system performance. Mounting on a rooftop, where nearby buildings are higher
than the installation location, is not an ideal location for the antenna.
than the installation location, is not an ideal location for the antenna.
• Height is preferred for optimal performance. Mount the antenna as high as possible,
but no higher than 100 feet. If the antenna is going to be more than 100 feet above the
CCU, you should use a Tower CCU 100.
CCU, you should use a Tower CCU 100.
A side arm antenna installation must be done if the endpoint antenna is mounted where it
does not have an unobstructed 360-degree view. Refer to the following guidelines for a side
arm antenna installation.
does not have an unobstructed 360-degree view. Refer to the following guidelines for a side
arm antenna installation.
• For the endpoint antenna, the minimum standoff distance is 24 inches, where the
interfering structural members are four inches or less in diameter and spaced more
than eight feet apart.
than eight feet apart.
• For structural members between 4 and 10 inches in diameter, a sliding scale of 2 to 5
feet is to be used. (For example, a 24 inch standoff at 4 inch diameter to a 60 inch
standoff at 10 inch member diameter.)
standoff at 10 inch member diameter.)
• When local site conditions do not meet this requirement (for example, when structural
members are greater than 10 inches in diameter and/or members are less than 8 feet
apart), additional analysis is required to determine the effect on the pattern.
Adjustment to the propagation model may be needed. Provide Itron with the diameter
of the structural members and the distance between them so that a thorough analysis
can be performed. If the structure covers more than 30 degrees of the pattern (as
measured from the proposed standoff distance), the site is considered as a 180 degree
sector from a systems design perspective and another CCU/Repeater and antenna need
to be installed on the opposite side of the structure.
apart), additional analysis is required to determine the effect on the pattern.
Adjustment to the propagation model may be needed. Provide Itron with the diameter
of the structural members and the distance between them so that a thorough analysis
can be performed. If the structure covers more than 30 degrees of the pattern (as
measured from the proposed standoff distance), the site is considered as a 180 degree
sector from a systems design perspective and another CCU/Repeater and antenna need
to be installed on the opposite side of the structure.
Grounding the Antenna System
To minimize the potential for a lightning event, it is essential that the remote antenna
system be properly grounded. Proper grounding prevents the accumulation of static charges
on the antenna system and also provides a direct discharge to ground for any acquired
charges.
system be properly grounded. Proper grounding prevents the accumulation of static charges
on the antenna system and also provides a direct discharge to ground for any acquired
charges.
All grounding materials and procedures must meet or exceed local codes. Use coaxial
grounding kits recommended by the coaxial cable manufacturer.
grounding kits recommended by the coaxial cable manufacturer.
Warning Under no circumstances should the antenna grounding wires be run
inside a building. Always install ground bars and grounding material on the
exterior of buildings.
inside a building. Always install ground bars and grounding material on the
exterior of buildings.