Installation & User Manual
60dB, as a result, the isolation required between the subscriber and
the donor antenna is in a range of 70dB. The line of sight separation
between the subscriber (indoor) and donor (outdoor) antennas
represented by a free space loss of 70dB within a building is 17
meters (55 feet). The separation distance can be reduced if the donor
antenna is mounted on the building exterior (i.e. on a roof), or using a
directional donor antenna (narrow beam width). For example, if a
metal roof separates the indoor and outdoor antennas, the physical
separation may be substantially reduced.
The following table indicates separation distances for different
installation configurations:
Line of Sight in-
building
Exterior Donor Antenna,
with 20dB Attenuation
1
Exterior mounted
Directional Antenna
2
Separation
Distance
meters (ft)
17 (55)
8 (26)
4 (13)
1
The attenuation is indicative of the construction material that a signal has to penetrate
through
2
As in
1
, but using a directional antenna with a typical front to back ratio of 20dB
It is not recommended that the donor (outdoor) and subscriber
(indoor) antennas be installed within sight of each other. Do not install
the unit where a skylight or other low loss RF path exists between the
donor or subscriber antenna. Arrista recommends that the donor
(outdoor) antenna be installed on the roof or on an outside wall of a
building. A cell phone can be used to determine if an adequate signal
is present at the chosen location. Run a length of 50-ohm cable
between chosen location and the repeater unit.
Cable Length Recommended Cable
< 50 ft
Andrew CNT-100, CNT-200
Times Microwave LMR-240, or equiv.
50 – 100 ft
Andrew CNT-400
Times Microwave LMR-400, or equiv.
> 150 ft
Andrew CNT-600 or equivalent
Select a suitable location for the subscriber (indoor) antenna, and
connect it to the
Ant 1
port of the repeater.
If only one subscriber (indoor) antenna is to be used, flip the switch to
the left to disable the second subscriber port.
Copyright © 2004 Arrista Technologies Inc. All rights reserved.
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