Operator's Manual

CI Wireless Inc. Installation of the CDR812
MirrorCell Select CDR812 Manual
Rev. X1 7-1
7 INSTALLATION OF THE CDR812
7.1 Shipment Contents
• Repeater
• Operator’s manual
• Wall mount brackets
• Keys for repeater’s locks
• “Quick Tips”
7.2 Site Selection
Site selection for the repeater is one of the most critical decisions affecting the overall
performance of the repeater system. A repeater must be located where it can receive a
sufficient signal from the donor site in order to maximize the repeater’s performance. For
40dBm output, an input signal strength at the donor input connector (after the donor
antenna and coax cable) of greater than or equal to –55dBm is required for a 40dBm
output: -55dBm + 95dB gain = 40dBm.
Examples of repeater and accompanying antenna locations include, but are not limited
to:
• the roof of a building adjacent to the affected area with the antennas
mounted to the penthouse or building sides
• the top of a hill that is obstructing the donor site’s coverage, with the
antennas pipe-mounted at ground level
• a water tower with antennas mounted at the top
• an existing utility pole, with equipment and antennas mounted below any
existing power lines
• a newly installed pole or tower.
For more detailed information on site selection, as well as antenna selection and
placement, please see CI Wireless’ Application Note: “Integrating MirrorCell Select
Repeaters into a CDMA Network.”
7.3 Antenna Selection
Proper selection of the repeater’s donor and server antennas is crucial in designing the
repeater system. Good antenna characteristics help to provide proper isolation between
the server and donor antennas, which helps to prevent feedback.
The donor antenna selected for use with a CDR812 is critical in the design of a properly
functioning repeater system. Since in CDMA systems all of the base stations transmit the
same frequency, the donor antenna selected must be capable of receiving only the
desired base station. Microwave dish antennas with vertical and horizontal beamwidths of